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Institut
- Graduate School of Life Sciences (131)
- Theodor-Boveri-Institut für Biowissenschaften (87)
- Institut für Informatik (47)
- Institut für Psychologie (46)
- Medizinische Klinik und Poliklinik I (44)
- Medizinische Klinik und Poliklinik II (43)
- Universität - Fakultätsübergreifend (40)
- Neurologische Klinik und Poliklinik (39)
- Klinik und Poliklinik für Anästhesiologie (ab 2004) (33)
- Lehrstuhl für Orthopädie (32)
- Institut für Geographie und Geologie (31)
- Institut für Pharmazie und Lebensmittelchemie (28)
- Institut für Organische Chemie (27)
- Institut für Anorganische Chemie (26)
- Institut für Anatomie und Zellbiologie (24)
- Klinik und Poliklinik für Psychiatrie, Psychosomatik und Psychotherapie (24)
- Deutsches Zentrum für Herzinsuffizienz (DZHI) (23)
- Physikalisches Institut (22)
- Institut für diagnostische und interventionelle Radiologie (Institut für Röntgendiagnostik) (21)
- Neuphilologisches Institut - Moderne Fremdsprachen (20)
- Neurochirurgische Klinik und Poliklinik (20)
- Pathologisches Institut (20)
- Rudolf-Virchow-Zentrum (19)
- Institut für Molekulare Infektionsbiologie (17)
- Kinderklinik und Poliklinik (17)
- Lehrstuhl für Tissue Engineering und Regenerative Medizin (17)
- Abteilung für Funktionswerkstoffe der Medizin und der Zahnheilkunde (16)
- Institut für Klinische Epidemiologie und Biometrie (16)
- Institut für Virologie und Immunbiologie (16)
- Julius-von-Sachs-Institut für Biowissenschaften (16)
- Klinik und Poliklinik für Allgemein-, Viszeral-, Gefäß- und Kinderchirurgie (Chirurgische Klinik I) (16)
- Institut für Altertumswissenschaften (15)
- Institut für Experimentelle Biomedizin (15)
- Frauenklinik und Poliklinik (14)
- Institut für Klinische Neurobiologie (14)
- Institut für Theoretische Physik und Astrophysik (14)
- Klinik und Poliklinik für Mund-, Kiefer- und Plastische Gesichtschirurgie (14)
- Comprehensive Cancer Center Mainfranken (13)
- Institut Mensch - Computer - Medien (13)
- Institut für Physikalische und Theoretische Chemie (13)
- Institut für Systematische Theologie (13)
- Klinik und Poliklinik für Hals-, Nasen- und Ohrenkrankheiten, plastische und ästhetische Operationen (13)
- Klinik und Poliklinik für Nuklearmedizin (13)
- Klinik und Poliklinik für Strahlentherapie (12)
- Klinik und Poliklinik für Unfall-, Hand-, Plastische und Wiederherstellungschirurgie (Chirurgische Klinik II) (12)
- Institut für Allgemeinmedizin (11)
- Institut für Internationales Recht, Europarecht und Europäisches Privatrecht (11)
- Institut für Pharmakologie und Toxikologie (11)
- Klinik und Poliklinik für Dermatologie, Venerologie und Allergologie (11)
- Institut für Mathematik (10)
- Institut für Hygiene und Mikrobiologie (9)
- Institut für Pädagogik (9)
- Klinik und Poliklinik für Kinder- und Jugendpsychiatrie, Psychosomatik und Psychotherapie (9)
- Missionsärztliche Klinik (9)
- Graduate School of Science and Technology (8)
- Institut für Sonderpädagogik (8)
- Institut für Sportwissenschaft (8)
- Betriebswirtschaftliches Institut (7)
- Institut für deutsche Philologie (7)
- Medizinische Fakultät (7)
- Volkswirtschaftliches Institut (7)
- Fakultät für Biologie (6)
- Institut für Kulturwissenschaften Ost- und Südasiens (6)
- Institut für Politikwissenschaft und Soziologie (6)
- Institut für diagnostische und interventionelle Neuroradiologie (ehem. Abteilung für Neuroradiologie) (6)
- Institut für Geschichte der Medizin (5)
- Institut für Rechtsmedizin (5)
- Klinik und Poliklinik für Thorax-, Herz- u. Thorakale Gefäßchirurgie (5)
- Lehrstuhl für Biochemie (5)
- Urologische Klinik und Poliklinik (5)
- Augenklinik und Poliklinik (4)
- Center for Computational and Theoretical Biology (4)
- Institut für Evangelische Theologie und Religionspädagogik (4)
- Institut für Klinische Transfusionsmedizin und Hämotherapie (4)
- Institut für Systemimmunologie (4)
- Klinik und Polikliniken für Zahn-, Mund- und Kieferkrankheiten (4)
- Physiologisches Institut (4)
- Poliklinik für Zahnerhaltung und Parodontologie (4)
- Fakultät für Chemie und Pharmazie (3)
- Graduate School of Law, Economics, and Society (3)
- Graduate School of the Humanities (3)
- Institut für Geschichte (3)
- Institut für Humangenetik (3)
- Juristische Fakultät (3)
- Poliklinik für Kieferorthopädie (3)
- Poliklinik für Zahnärztliche Prothetik (3)
- Abteilung für Forensische Psychiatrie (2)
- Abteilung für Molekulare Innere Medizin (in der Medizinischen Klinik und Poliklinik II) (2)
- Fakultät für Mathematik und Informatik (2)
- Institut für Medizinische Lehre und Ausbildungsforschung (2)
- Institut für Philosophie (2)
- Institut für medizinische Datenwissenschaften (2)
- Universität Würzburg (2)
- Abteilung für Parodontologie (in der Poliklinik für Zahnerhaltung und Parodontologie) (1)
- Fakultät für Humanwissenschaften (Philos., Psycho., Erziehungs- u. Gesell.-Wissensch.) (1)
- Graduate Schools (1)
- Institut für Funktionsmaterialien und Biofabrikation (1)
- Institut für Geographie (1)
- Institut für Musikforschung (1)
- Institut für Strafrecht und Kriminologie (1)
- Klinik für Anaesthesiologie (bis 2003) (1)
- Universitätsbibliothek (1)
- Wirtschaftswissenschaftliche Fakultät (1)
Schriftenreihe
Sonstige beteiligte Institutionen
- Helmholtz Institute for RNA-based Infection Research (HIRI) (2)
- Interdisziplinäres Zentrum für Klinische Forschung (IZKF) (2)
- Klinische Studienzentrale (Universitätsklinikum) (2)
- Naturalis Biodiversity Centre (2)
- Rudolf Virchow Center for Integrative and Translational Bioimaging, University of Würzburg (2)
- Akademie der Wissenschaften und der Literatur, Mainz (1)
- Anthropology Department University of Tennessee, Knoxville (1)
- Bungando Medical Centre, Mwanza, Tanzania (1)
- CHC Würzburg (Comprehensive Hearing Center) (1)
- CIBSS Centre for Integrative Biological Signalling Studies, University of Freiburg (1)
Pulmonary artery embolism (PE) is a common condition and an even more common clinical suspect. The computed tomography pulmonary angiogram (CTPA) is the main medical imaging tool used to diagnose a suspected case of PE. To gain a better impression of the effects of a PE on the perfusion and hence the gas exchange, a functional imaging method is beneficial. One approach for functional imaging using radiation exposure is the generation of color-coded iodine perfusion maps acquired by Dual-Energy Computed Tomography (DECT), which enable the detection of perfusion defects in the pulmonary parenchyma. In contrast to the existing approach of DECT with iodine color-coded maps, the SElf-gated Non-Contrast-Enhanced FUnctional Lung (SENCEFUL) MRI technique offers the possibility to interpret perfusion maps without any radiation exposure or application of contrast agents. The measurement in SENCEFUL MRI can be performed during conditions of free breathing and without electrocardiogram triggering.
The purpose of this study was to determine whether PE can be diagnosed on the basis of visible perfusion defects in the perfusion maps of SENCEFUL MRI and in the iodine-coded maps of DECT and to compare the diagnostic performance of these methods. Both SENCEFUL-MRI and iodine distribution maps from DECT have been compared with the CTPA of ten patients with PE. Additionally, the functional images were compared with each other on a per-patient basis.
The iodine perfusion maps of DECT had a sensitivity of 84.2 % and specificity of 65.2 % for the diagnosis of PE. The SENCEFUL technique in MRI showed a sensitivity of 78.9 % and a specificity of 26.1 %. When comparing the whole lung depicted in both series of functional images, the main perfusion defect location matched in four of ten patients (40 %).
In conclusion, this work found that DECT iodine maps have higher sensitivity and specificity in the diagnosis of pulmonary embolism compared with SENCEFUL MRI.
Scalability is often mentioned in literature, but a stringent definition is missing. In particular, there is no general scalability assessment which clearly indicates whether a system scales or not or whether a system scales better than another. The key contribution of this article is the definition of a scalability index (SI) which quantifies if a system scales in comparison to another system, a hypothetical system, e.g., linear system, or the theoretically optimal system. The suggested SI generalizes different metrics from literature, which are specialized cases of our SI. The primary target of our scalability framework is, however, benchmarking of two systems, which does not require any reference system. The SI is demonstrated and evaluated for different use cases, that are (1) the performance of an IoT load balancer depending on the system load, (2) the availability of a communication system depending on the size and structure of the network, (3) scalability comparison of different location selection mechanisms in fog computing with respect to delays and energy consumption; (4) comparison of time-sensitive networking (TSN) mechanisms in terms of efficiency and utilization. Finally, we discuss how to use and how not to use the SI and give recommendations and guidelines in practice. To the best of our knowledge, this is the first work which provides a general SI for the comparison and benchmarking of systems, which is the primary target of our scalability analysis.
[\(^{223}\)Ra]RaCl\(_2\) and [\(^{224}\)Ra]RaCl\(_2\) are bone seekers, emitting high LET, and short range (< 100 μm) alpha-particles. Both radionuclides show similar decay properties; the total alpha energies are comparable (\(^{223}\)Ra: ≈28 MeV, \(^{224}\)Ra: ≈26 MeV). [\(^{224}\)Ra]RaCl\(_2\) has been used from the mid-1940s until 1990 for treating different bone and joint diseases with activities of up to approximately 50 MBq [\(^{224}\)Ra]RaCl\(_2\). In 2013 [\(^{223}\)Ra]RaCl\(_2\) obtained marketing authorization by the FDA and by the European Union for the treatment of metastatic prostate cancer with an activity to administer of 0.055 MBq per kg body weight for six cycles. For intravenous injections in humans a model calculation using the biokinetic model of ICRP67 shows a ratio of organ absorbed dose coefficients (\(^{224}\)Ra:\(^{223}\)Ra) between 0.37 (liver) and 0.97 except for the kidneys (2.27) and blood (1.57). For the red marrow as primary organ-at-risk, the ratio is 0.57. The differences are mainly caused be the differing half-lives of the decay products of both radium isotopes. Both radionuclides show comparable DNA damage patterns in peripheral blood mononuclear cells after internal ex-vivo irradiation. Data on the long-term radiation-associated side effects are only available for treatment with [\(^{224}\)Ra]RaCl\(_2\). Two epidemiological studies followed two patient groups treated with [\(^{224}\)Ra]RaCl\(_2\) for more than 25 years. One of them was the “Spiess study”, a cohort of 899 juvenile patients who received several injections of [\(^{224}\)Ra]RaCl\(_2\) with a mean specific activity of 0.66 MBq/kg. Another patient group of ankylosing spondylitis patients was treated with 10 repeated intravenous injections of [\(^{224}\)Ra]RaCl\(_2\), 1 MBq each, 1 week apart. In total 1,471 of these patients were followed-up in the “Wick study”. In both studies, an increased cancer mortality by leukemia and solid cancers was observed. Similar considerations on long-term effects likely apply to [\(^{223}\)Ra]RaCl\(_2\) as well since the biokinetics are similar and the absorbed doses in the same range. However, this increased risk will most likely not be observed due to the much shorter life expectancy of prostate cancer patients treated with [\(^{223}\)Ra]RaCl\(_2\).
Purpose
Hypertrophic cartilage is an important characteristic of osteoarthritis and can often be found in patients suffering from osteoarthritis. Although the exact pathomechanism remains poorly understood, hypertrophic de-differentiation of chondrocytes also poses a major challenge in the cell-based repair of hyaline cartilage using mesenchymal stromal cells (MSCs). While different members of the transforming growth factor beta (TGF-β) family have been shown to promote chondrogenesis in MSCs, the transition into a hypertrophic phenotype remains a problem. To further examine this topic we compared the effects of the transcription growth and differentiation factor 5 (GDF-5) and the mutant R57A on in vitro chondrogenesis in MSCs.
Methods
Bone marrow-derived MSCs (BMSCs) were placed in pellet culture and in-cubated in chondrogenic differentiation medium containing R57A, GDF-5 and TGF-ß1 for 21 days. Chondrogenesis was examined histologically, immunohistochemically, through biochemical assays and by RT-qPCR regarding the expression of chondrogenic marker genes.
Results
Treatment of BMSCs with R57A led to a dose dependent induction of chondrogenesis in BMSCs. Biochemical assays also showed an elevated glycosaminoglycan (GAG) content and expression of chondrogenic marker genes in corresponding pellets. While treatment with R57A led to superior chondrogenic differentiation compared to treatment with the GDF-5 wild type and similar levels compared to incubation with TGF-ß1, levels of chondrogenic hypertrophy were lower after induction with R57A and the GDF-5 wild type.
Conclusions
R57A is a stronger inducer of chondrogenesis in BMSCs than the GDF-5 wild type while leading to lower levels of chondrogenic hypertrophy in comparison with TGF-ß1.
Bullous pemphigoid is the most common autoimmune blistering disease in industrialized countries and particularly affects the elderly. In this patient population, comorbid diseases are frequent and may complicate management and treatment of bullous pemphigoid. A better understanding why distinct diseases are more frequent in bullous pemphigoid patients may lead to new pathophysiological insights and - as a consequence - result in better patient care. The association of bullous pemphigoid with neurological and psychiatric diseases is well known and confirmed by several case-control studies. Association with further diseases such as malignancy and metabolic diseases are still discussed controversially. In recent years new relationships between bullous pemphigoid and autoimmune as well as inflammatory skin diseases have been reported. This review provides a systematic overview on studies addressing comorbidity in bullous pemphigoid patients. Increasing the awareness of both, common and rare comorbid diseases, may enable clinicians to optimize patient support and individualized treatment of bullous pemphigoid.
Seed amplification assays (SAA) are becoming commonly used in synucleinopathies to detect α-synuclein aggregates. Studies in Parkinson’s disease (PD) and isolated REM-sleep behavior disorder (iRBD) have shown a considerably lower sensitivity in the olfactory epithelium than in CSF or skin. To get an insight into α-synuclein (α-syn) distribution within the nervous system and reasons for low sensitivity, we compared SAA assessment of nasal brushings and skin biopsies in PD (n = 27) and iRBD patients (n = 18) and unaffected controls (n = 30). α-syn misfolding was overall found less commonly in the olfactory epithelium than in the skin, which could be partially explained by the nasal brushing matrix exerting an inhibitory effect on aggregation. Importantly, the α-syn distribution was not uniform: there was a higher deposition of misfolded α-syn across all sampled tissues in the iRBD cohort compared to PD (supporting the notion of RBD as a marker of a more malignant subtype of synucleinopathy) and in a subgroup of PD patients, misfolded α-syn was detectable only in the olfactory epithelium, suggestive of the recently proposed brain-first PD subtype. Assaying α-syn of diverse origins, such as olfactory (part of the central nervous system) and skin (peripheral nervous system), could increase diagnostic accuracy and allow better stratification of patients.
Combined pulmonary fibrosis and emphysema (CPFE) is a recently recognized syndrome that, as its name indicates, involves the existence of both interstitial lung fibrosis and emphysema in one individual, and is often accompanied by pulmonary hypertension. This debilitating, progressive condition is most often encountered in males with an extensive smoking history, and is presented by dyspnea, preserved lung volumes, and contrastingly impaired gas exchange capacity. The diagnosis of the disease is based on computed tomography imaging, demonstrating the coexistence of emphysema and interstitial fibrosis in the lungs, which might be of various types and extents, in different areas of the lung and several relative positions to each other. CPFE bears high mortality and to date, specific and efficient treatment options do not exist. In this review, we will summarize current knowledge about the clinical attributes and manifestations of CPFE. Moreover, we will focus on pathophysiological and pathohistological lung phenomena and suspected etiological factors of this disease. Finally, since there is a paucity of preclinical research performed for this particular lung pathology, we will review existing animal studies and provide suggestions for the development of additional in vivo models of CPFE syndrome.
Background and Objectives: Chronic painful midportion Achilles combined with plantaris tendinopathy can be a troublesome condition to treat. The objective was to prospectively follow patients subjected to ultrasound (US)- and color doppler (CD)-guided wide awake, local anesthetic, no-tourniquet (WALANT) surgery in a private setting. Material and Methods: Twenty-six Swedish patients (17 men and 9 women, mean age 50 years (range 29–62)) and eight international male patients (mean age of 38 years (range 25–71)) with combined midportion Achilles and plantaris tendinopathy in 45 tendons altogether were included. All patients had had >6 months of pain and had tried non-surgical treatment with eccentric training, without effect. US + CD-guided surgical scraping of the ventral Achilles tendon and plantaris removal under local anesthesia was performed on all patients. A 4–6-week rehabilitation protocol with an immediate full-weight-bearing tendon loading regime was used. The VISA-A score and a study-specific questionnaire evaluating physical activity level and subjective satisfaction with the treatment were used for evaluation. Results: At the 1-year follow-up, 32/34 patients (43 tendons) were satisfied with the treatment result and had returned to their pre-injury Achilles tendon loading activity. There were two dropouts (two tendons). For the Swedish patients, the mean VISA-A score increased from 34 (0–64) before surgery to 93 (61–100) after surgery (p < 0.001). There were two complications, one wound rupture and one superficial skin infection. Conclusions: For patients suffering from painful midportion Achilles tendinopathy and plantaris tendinopathy, US + CD-guided surgical Achilles tendon scraping and plantaris tendon removal showed a high satisfaction rate and good functional results 1 year after surgery.
Cancer is one of the leading causes of death worldwide, with currently assessed chances to develop at least one cancer in a lifetime for about 20%. High cases rates and mortality require the development of new anticancer therapies and treatment strategies. Another important concern is toxicity normally associated with conventional therapy methods, such as chemo- and radiotherapy. Among many proposed antitumoral agents, oncolytic viruses are still one of the promising and fast-developing fields of research with almost a hundred studies published data on over 3000 patients since the beginning of the new millennia.
Among all oncolytic viruses, the Vaccinia virus is arguably one of the safest, with an extremely long and prominent history of use, since it was the one and only vaccine used in the Smallpox Eradication Program in the 1970s. Interestingly enough, it was the first oncolytic virus proven to have tumor tropism in vitro and in vivo in laboratory settings, and this year we can celebrate an unofficial 100th anniversary since the publication of the fact. While being highly immunogenic, Vaccinia virus DNA replication takes place in the cytoplasm of the infected cell, and virus genes never integrate into the host genome. Another advantage of using Vaccinia as an oncolytic agent is its high genome capacity, which allows inserting up to 25 kbps of exogenous genes, thus allowing to additionally arm the virus against the tumor.
Oncolytic virus action consists of two major parts: direct oncolysis and immune activation against the tumor, with the latter being the key to successful treatment. To this moment, preclinical research data are mostly generated in immunocompromised xenograft models, which have hurdles to be properly translated for clinical use. In the first part of the current study, fourteen different recombinant Vaccinia virus strains were tested in two different murine tumor cell lines and corresponding immunocompetent animal models. We found, that Copenhagen backbone Vaccinia viruses while being extremely effective in cell culture, do not show significant oncolytic efficacy in animals. In contrast, several of the LIVP backbone viruses tested (specifically, IL-2 expressing ones) have little replication ability when compared to the Copenhagen strain, but are able to significantly delay tumor growth and prolong survival of the treated animals. We have also noted cytokine related toxicity of the animals to be mouse strain specific.
We have also tested the virus with the highest therapeutic benefit in combination with romidepsin and cyclophosphamide. While the combination with histone deacetylase inhibitor romidepsin did not result in therapeutic benefit in our settings, the addition of cyclophosphamide significantly improved the efficacy of the treatment, at the same time reducing cytokine-associated toxicity of the IL-2 expressing virus.
In the second part of the work, we analyzed the ability of adipose-derived mesenchymal stem cells to serve as a carrier for the oncolytic Vaccinia virus. We showed for the first time that the cells can be infected with the virus and can generate virus progeny. They are also able to survive for a substantially long time and, when injected into the bloodstream of tumor-bearing animals, produce the virus that is colonizing the tumor. Analysis of the systemic distribution of the cells after injection revealed that infected and uninfected cells are not distributed in the same manner, possibly suggesting that infected cells are getting recognized and cleared by an impaired immune system of athymic mice faster than non-infected cells. Despite this, injection of virus-loaded adipose-derived mesenchymal stem cells to human A549 tumor-bearing xenograft mice resulted in rapid tumor regression and reduced virus-related side effects of the treatment when compared to injection of the naked virus.
In conclusion, we have tested two different approaches to augmenting oncolytic Vaccinia virus therapy. First, the combination of recombinant Vaccinia virus expressing IL-2 and cyclophosphamide showed promising results in a syngeneic mouse model, despite the low permissivity of murine cells to the virus. Second, we loaded the oncolytic Vaccinia virus into mesenchymal stem cells and have proven that they can potentially serve as a vehicle for the virus.
The goal of this thesis was the development and application of higher-order spectroscopic techniques. In contrast to ordinary pump–probe (PP) and two-dimensional (2D) spectroscopy, higher-order coherently detected spectroscopic methods measure a polarization that has an order of nonlinearity higher than three. The key idea of the techniques in this thesis is to isolate the higher-order signals from the lower-order signals either by their excitation frequency or by their excitation intensity dependence. Due to the increased number of interactions in higher-order spectroscopy, highly excited states can be probed. For excitonic systems such as aggregates and polymers, the fifth-order signal allows one to directly measure exciton–exciton annihilation (EEA). In polymers and aggregates, the exciton transport is not connected to a change of the absorption and can therefore not be investigated with conventional third-order techniques. In contrast, EEA can be used as a probe to study exciton diffusion in these isonergetic systems. As a part of this thesis, anisotropy in fifth-order 2D spectroscopy was investigated and was used to study geometric properties in polymers.
In 2D spectroscopy, the multi-quantum signals are separated from each other by their spectral position along the excitation axis. This concept can be extended systematically to higher signals. Another approach to isolate multi-quantum signals in PP spectroscopy utilizes the excitation intensity. The PP signal is measured at specific excitation intensities and linear combinations of these measurements result in different signal contributions. However, these signals do not correspond to clean nonlinear signals because the higher-order signals contaminate the lower-order multi-quantum signals. In this thesis, a correction protocol was derived that uses the isolated multiquantum signals, both from 2D spectroscopy and from PP spectroscopy, to remove the contamination of higher-order signals resulting in clean nonlinear signals. Using the correction on the third-order signal allows one to obtain annihilation-free signals at high excitation intensities, i.e., with high signal-to-noise ratio. Isolation and correction in PP and 2D spectroscopy were directly compared by measuring the clean third-order signals of squaraine oligomers at high excitation intensities. Furthermore, higher-order PP spectroscopy was used to isolate up to the 13th nonlinear order of squaraine polymers.
The demonstrated spectroscopic techniques represent general procedures to isolate clean signals in terms of perturbation theory. The technique of higher-order PP spectroscopy needs only small modifications of ordinary PP setups which opens the field of higher-order spectroscopy to the broad scientific community. The technique to obtain clean nonlinear signals allows one to systematically increase the number of interacting (quasi)particles in a system and to characterize their interaction energies and dynamics.
A well-known result for the interference of two single-mode fields is that the degree of coherence and the degree of indistinguishability are the same when we consider the detection of a single photon. In this article, we present the relation between the degree of coherence, path indistinguishability and the fringe visibility considering interference of multiple numbers of single-mode fields while being interested in the detection of a single photon only. We will also mention how Born’s rule of interference for multiple sources is reflected in these results.
In three experiments, we examined the cognitive underpinnings of self-serving dishonesty by manipulating cognitive load under different incentive structures. Participants could increase a financial bonus by misreporting outcomes of private die rolls without any risk of detection. At the same time, they had to remember letter strings of varying length. If honesty is the automatic response tendency and dishonesty is cognitively demanding, lying behavior should be less evident under high cognitive load. This hypothesis was supported by the outcome of two out of three experiments. We further manipulated whether all trials or only one random trial determined payoff to modulate reward adaptation over time (Experiment 2) and whether payoff was framed as a financial gain or loss (Experiment 3). The payoff scheme of one random or all trials did not affect lying behavior and, discordant to earlier research, facing losses instead of gains did not increase lying behavior. Finally, cognitive load and incentive frame interacted significantly, but contrary to our assumption gains increased lying under low cognitive load. While the impact of cognitive load on dishonesty appears to be comparably robust, motivational influences seem to be more elusive than commonly assumed in current theorizing.
Die CDI ist weltweit die häufigste Ursache der antibiotikaassoziierten nosokomialen Diarrhoe. Sie geht mit steigender Inzidenz, Hospitalisierung und hohen Behandlungskosten in Milliardenhöhe einher. Auch im ambulanten Sektor werden steigende Infektionszahlen gemeldet, die nicht nur ein Problem für die Krankenhäuser, sondern auch für die Pflegeeinrichtungen darstellen.
Ziel dieser Arbeit war es, retrospektiv die CDI-Fälle des Klinikums Aschaffenburg-Alzenau (ausgenommen Kinderklinik) im Zeitraum 01.01.2013 - 25.05.2015 zu erfassen und die antibiotische Initialtherapie zu ermitteln. Für die Diagnose einer CDI wurde ein positiver Toxinnachweis in der Stuhlkultur vorausgesetzt. Im weiteren Fokus standen die Rezidivhäufigkeit, die antibiotische Folgetherapie, die Komplikationen bis hin zu den Todesursachen sowie Präventionsmaßnahmen.
Im o.g. Zeitraum waren 299 Patienten und Patientinnen mit einer CDI hospitalisiert. Das mittlere Alter lag bei 73,8 Jahren. Es handelte sich in der Mehrzahl um multimorbide und immunsupprimierte Patienten und Patientinnen. 61% waren antibiotisch vorbehandelt. Am häufigsten verwendet wurden Breitbandpenicilline (36%), Cephalosporine der 3. Generation (12%) und Fluorchinolone (10%). Über 1/3 der Patienten und Patientinnen wurde mit Mehrfachkombinationen behandelt und bei 2% war eine zytostatische Behandlung vorausgegangen. In der Initialtherapie der CDI kam bei fast der Hälfte Erkrankten (47%) Metronidazol zur Anwendung. Die Rezidivrate lag bei 20%, Mehrfachrezidive traten bei 5,7% auf. Die antibiotische Folgetherapie der CDI erfolgte bei 39% der Patienten und Patientinnen mit Vancomycin oder Fidaxomicin entsprechend den damals geltenden Empfehlungen leitlinienkonform. Rund ¼ aller Erkrankten verstarben, davon 17% CDI-assoziiert. Der fäkale Stuhltransfer, der ab dem 2. Rezidiv empfohlen wird, und die Genotypisierung bei Mehrfachrezidiven wurde in keinem Fall durchgeführt.
2021 wurde die CDI-Behandlungsleitlinie der ESCMID aktualisiert. Statt dem Einsatz von Metronidazol werden nun Fidaxomicin oder Vancomycin, in Rezidivsituationen die Standardantibiose um den Antikörper Bezlotoxumab ergänzt. 06/2023 erschien die Konsultationsfassung der S2k-Leitlinie “Gastrointestinale Infektionen und Morbus Whipple” der DGVS. Die Empfehlungen gleichen sich.
Es kann festgehalten werden, dass die CDI auch im Klinikum Aschaffenburg-Alzenau ein ernstes Problem darstellt, das Präventionsmaßnahmen bedarf. Die Rezidiv- und
Todesraten sind hoch.
In dieser Arbeit konnte bestätigt werden, dass der unbedachte Einsatz von Antibiotika ein wichtiger Hauptrisikofaktor für die Entstehung einer CDI ist. Daher sollte die Indikation für eine antibiotische Therapie streng gestellt werden. Die Daten zeigen ferner, dass die Umsetzung aktueller Leitlinienempfehlungen nicht oder zeitlich verzögert erfolgte.
Seit der Etablierung und Umsetzung des ABS 2017 am Klinikum Aschaffenburg-Alzenau konnte ein Rückgang der CDI um 21% verzeichnet werden. Ein ABS ist eine Möglichkeit die konsequente Anwendung aktueller Empfehlungen im klinischen Alltag umzusetzen und so zu einer höheren Erfolgsrate der Behandlung und einer niedrigeren Rezidivrate beizutragen. Die Umsetzung einer gezielten frühen Diagnostik, Schutz- und Isoliermaßnahmen, Surveillance und regelmäßige Fort- und Weiterbildung der Mitarbeiter*innen sind weitere wichtige Bausteine, die zur Prävention der CDI beitragen.
Auf Grund der hohen Affinität von closo-Borclustern zu Proteinen, stellen mit closo-Borclustern modifizierte Chromatographiematerialien mögliche neuartige Chromatographiematerialien in der biologischen und pharmazeutischen Chemie dar. Im Zuge dieser Arbeit sollen Synthesen von Amin- und Allyl-funktionalisierten closo-Borclustern (Dicarba-closo-dodecaborane, Carba-closo-dodecaborat-, closo-Dodecaborat- und closo-Decaborat-Anionen) entwickelt werden, die sich für eine anschließende Oberflächenmodifikation eignen. Als Vergleichsverbindung mit einem organischen Grundgerüst dienen Amantadin und Allyl-funktionalisierte Adamantan-Derivate. Diese Verbindungen sollen auf die Oberfläche von Materialien aufgebracht und diese anschließend charakterisiert werden. Besonders die Untersuchung bezüglich ihrer Fähigkeit der dynamischen Bindungskapazität gegenüber Bovin-Albumin-Serum Fraktion V ist ein Schwerpunkt dieser Arbeit. Hierbei wird vor allem der Vergleich zu dem käuflich erwerblichen CaptoTM Blue gezogen.
Der zweite Teil dieser Arbeit beschäftigt sich mit der Synthese von Trialkylammonium-Salzen von halogenierten und nicht halogenierten 1-Amino-carba-closo-dodecaborat-Anionen. Hierbei steht vor allem die Untersuchung der Wechselwirkung zwischen den verschiedenen Kationen und dem Anion im Fokus. Zu diesem Zweck wurden Synthesen hinführend zu den jeweiligen Salzen entwickelt und die erhaltenen Produkte umfassend charakterisiert.
Introduction
Medium-cut-off (MCO) dialyzers may beneficially impact outcomes in patients on hemodialysis.
Methods
In a randomized, controlled trial in maintenance hemodialysis patients, the new Nipro ELISIO-17HX MCO dialyzer was compared to the Baxter Theranova 400 filter regarding middle molecule removal. Furthermore, the suitability of two assays for free lambda-light chain (λFLC) detection (Freelite vs. N-Latex) was verified.
Results
ELISIO-HX achieved slightly lower reduction ratios for β2-microglobulin (71.8 ± 6.0 vs. 75.3 ± 5.8%; p = 0.001), myoglobin (54.7 ± 8.6 vs. 64.9 ± 8.7%; p < 0.001), and kappa-FLC (62.1 ± 8.8 vs. 56.3 ± 7.7%; p = 0.021). λFLC reduction ratios were more conclusive with the Freelite assay and not different between ELISIO-HX and Theranova (28.4 ± 3.9 vs. 38.7 ± 13.4%; p = 0.069). The albumin loss of Theranova was considerably higher (2.14 ± 0.45 vs. 0.77 ± 0.25 g; p = 0.001) and the Global Removal ScoreLoss alb largely inferior (30.6 ± 7.4 vs. 82.4 ± 29.2%/g; p = 0.006) to ELISIO-HX.
Conclusions
The new ELISIO-HX expands the choice of dialyzers for MCO hemodialysis.
Background
Adrenal incidentalomas with cortisol autonomy are associated with increased cardiovascular morbidity and mortality. Specific data on the clinical and biochemical course of affected patients are lacking.
Methods
Retrospective study from a tertiary referral centre in Germany. After exclusion of overt hormone excess, malignancy and glucocorticoid medication, patients with adrenal incidentalomas were stratified according to serum cortisol after 1 mg dexamethasone: autonomous cortisol secretion (ACS), >5.0; possible ACS (PACS), 1.9-5.0; non-functioning adenomas (NFA), ≤1.8 µg/dl.
Results
A total of 260 patients were enrolled (147 women (56.5%), median follow-up 8.8 (2.0-20.8) years). At initial diagnosis, median age was 59.5 (20-82) years, and median tumour size was 27 (10-116) mm. Bilateral tumours were more prevalent in ACS (30.0%) and PACS (21.9%) than in NFA (8.1%). Over time, 40/124 (32.3%) patients had a shift of their hormonal secretion pattern (NFA to PACS/ACS, n=15/53; PACS to ACS, n=6/47; ACS to PACS, n=11/24; PACS to NFA, n=8/47). However, none of the patients developed overt Cushing’s syndrome. Sixty-one patients underwent adrenalectomy (NFA, 17.9%; PACS, 24.0%; ACS, 39.0%). When non-operated patients with NFA were compared to PACS and ACS at last follow-up, arterial hypertension (65.3% vs. 81.9% and 92.0%; p<0.05), diabetes (23.8% vs. 35.6% and 40.0%; p<0.01), and thromboembolic events (PACS: HR 3.43, 95%-CI 0.89-13.29; ACS: HR 5.96, 95%-CI 1.33-26.63; p<0.05) were significantly less frequent, along with a trend towards a higher rate of cardiovascular events in case of cortisol autonomy (PACS: HR 2.23, 95%-CI 0.94-5.32; ACS: HR 2.60, 95%-CI 0.87-7.79; p=0.1). Twenty-five (12.6%) of the non-operated patients died, with higher overall mortality in PACS (HR 2.6, 95%-CI 1.0-4.7; p=0.083) and ACS (HR 4.7, 95%-CI 1.6-13.3; p<0.005) compared to NFA. In operated patients, prevalence of arterial hypertension decreased significantly (77.0% at diagnosis to 61.7% at last follow-up; p<0.05). The prevalence of cardiovascular events and mortality did not differ significantly between operated and non-operated patients, whereas thromboembolic events were significantly less frequent in the surgical treatment group.
Conclusion
Our study confirms relevant cardiovascular morbidity in patients with adrenal incidentalomas (especially those with cortisol autonomy). These patients should therefore be monitored carefully, including adequate treatment of typical cardiovascular risk factors. Adrenalectomy was associated with a significantly decreased prevalence of hypertension. However, more than 30% of patients required reclassification according to repeated dexamethasone suppression tests. Thus, cortisol autonomy should ideally be confirmed before making any relevant treatment decision (e.g. adrenalectomy).
The positive phase of the subtropical Indian Ocean dipole (SIOD) is one of the climatic modes in the subtropical southern Indian Ocean that influences the austral summer inter-annual rainfall variability in parts of southern Africa. This paper examines austral summer rain-bearing circulation types (CTs) in Africa south of the equator that are related to the positive SIOD and the dynamics through which specific rainfall regions in southern Africa can be influenced by this relationship. Four austral summer rain-bearing CTs were obtained. Among the four CTs, the CT that featured (i) enhanced cyclonic activity in the southwest Indian Ocean; (ii) positive widespread rainfall anomaly in the southwest Indian Ocean; and (iii) low-level convergence of moisture fluxes from the tropical South Atlantic Ocean, tropical Indian Ocean, and the southwest Indian Ocean, over the south-central landmass of Africa, was found to be related to the positive SIOD climatic mode. The relationship also implies that positive SIOD can be expected to increase the amplitude and frequency of occurrence of the aforementioned CT. The linkage between the CT related to the positive SIOD and austral summer homogeneous regions of rainfall anomalies in Africa south of the equator showed that it is the principal CT that is related to the inter-annual rainfall variability of the south-central regions of Africa, where the SIOD is already known to significantly influence its rainfall variability. Hence, through the large-scale patterns of atmospheric circulation associated with the CT, the SIOD can influence the spatial distribution and intensity of rainfall over the preferred landmass through enhanced moisture convergence.
Alveolar (AE) and cystic (CE) echinococcosis are two parasitic diseases caused by the tapeworms Echinococcus multilocularis and E. granulosus sensu lato (s. l.), respectively. Currently, AE and CE are mainly diagnosed by means of imaging techniques, serology, and clinical and epidemiological data. However, no viability markers that indicate parasite state during infection are available. Extracellular small RNAs (sRNAs) are short non-coding RNAs that can be secreted by cells through association with extracellular vesicles, proteins, or lipoproteins. Circulating sRNAs can show altered expression in pathological states; hence, they are intensively studied as biomarkers for several diseases. Here, we profiled the sRNA transcriptomes of AE and CE patients to identify novel biomarkers to aid in medical decisions when current diagnostic procedures are inconclusive. For this, endogenous and parasitic sRNAs were analyzed by sRNA sequencing in serum from disease negative, positive, and treated patients and patients harboring a non-parasitic lesion. Consequently, 20 differentially expressed sRNAs associated with AE, CE, and/or non-parasitic lesion were identified. Our results represent an in-depth characterization of the effect E. multilocularis and E. granulosus s. l. exert on the extracellular sRNA landscape in human infections and provide a set of novel candidate biomarkers for both AE and CE detection.
Acute and chronic cardiac disorders predispose to alterations in cognitive performance, ranging from mild cognitive impairment to overt dementia. Although this association is well-established, the factors inducing and accelerating cognitive decline beyond ageing and the intricate causal pathways and multilateral interdependencies involved remain poorly understood. Dysregulated and persistent inflammatory processes have been implicated as potentially causal mediators of the adverse consequences on brain function in patients with cardiac disease. Recent advances in positron emission tomography disclosed an enhanced level of neuroinflammation of cortical and subcortical brain regions as an important correlate of altered cognition in these patients. In preclinical and clinical investigations, the thereby involved domains and cell types of the brain are gradually better characterized. Microglia, resident myeloid cells of the central nervous system, appear to be of particular importance, as they are extremely sensitive to even subtle pathological alterations affecting their complex interplay with neighboring astrocytes, oligodendrocytes, infiltrating myeloid cells, and lymphocytes. Here, we review the current evidence linking cognitive impairment and chronic neuroinflammation in patients with various selected cardiac disorders including the aspect of chronic neuroinflammation as a potentially druggable target.
The human African trypanosomiasis is a neglected tropical disease, which is caused by the protozoan Trypanosoma brucei and transmitted by the bite of the tsetse fly. An untreated infection leads to death. However, only a few drugs with significant drawbacks are currently available for treatment. In this thesis, quinolone amides with an antitrypanosomal activity were synthesized and their biological and physicochemical properties were measured. New structure-activity relationships and a promising lead structure were discovered.
Propofol is a widely used general anesthetic in clinical practice, but its use is limited by its water-insoluble nature and associated pharmacokinetic and pharmacodynamic limitations. Therefore, researchers have been searching for alternative formulations to lipid emulsion to address the remaining side effects. In this study, novel formulations for propofol and its sodium salt Na-propofolat were designed and tested using the amphiphilic cyclodextrin (CD) derivative hydroxypropyl-β-cyclodextrin (HPβCD). The study found that spectroscopic and calorimetric measurements suggested complex formation between propofol/Na-propofolate and HPβCD, which was confirmed by the absence of an evaporation peak and different glass transition temperatures. Moreover, the formulated compounds showed no cytotoxicity and genotoxicity compared to the reference. The molecular modeling simulations based on molecular docking predicted a higher affinity for propofol/HPβCD than for Na-propofolate/HPβCD, as the former complex was more stable. This finding was further confirmed by high-performance liquid chromatography. In conclusion, the CD-based formulations of propofol and its sodium salt may be a promising option and a plausible alternative to conventional lipid emulsions.
Schädel-Hirn Trauma ist die führende Ursache von Tod und Behinderung unter jungen Erwachsenen in den USA und Europa. Darüber hinaus steigert Schädel-Hirn Trauma das Risiko eine Demenzerkrankung oder andere neurodegenerative Erkrankung zu erleiden. Aus diesem Grund stellt eine bessere Erkenntnis der subakuten und chronischen pathophysiologischen Prozesse eine wichtige Grundlage für eine mögliche zukünftige neuroprotektive Therapie dar. Ziel dieser Arbeit war es daher eine Übersicht von funktionellen Einschränkungen und zellulären Veränderungen in der subakuten Phase innerhalb der ersten drei Monate darzustellen. Dazu wurden Verhaltensexperimente zu kognitiven Leistungen wie räumliches Lernen, kognitive Plastizität, episodisches Gedächtnis, Angstverhalten und allgemeine Lokomotion durchgeführt. Dabei konnten funktionale Einschränkungen der Tiere im Bereich der kognitiven Flexibilität, dem räumlichen Lernen, dem belohnungsmotivierten Verhalten, sowie Hyperaktivität beobachtet werden. Weiterführend erfolgten histologische und immunhistologische Untersuchungen an den Mäusegehirnen. So konnten in unserem Tiermodell sowohl lokale neuroinflammatorische Veränderungen nachgewiesen werden, also auch generalisierte Veränderungen, welche sich auf Isocortex und Hippocampus erstreckten und beide Hemisphären gleichermaßen betrafen. Ebenso konnten demyelinisierende Prozesse im Bereich der Läsion beobachtet werden. Im Bereich des Cortex zeigte sich außerdem eine axonale Schädigung mit begleitender Neuroinflammation, sowie eine Infiltration von B-Zellen. Anschließend wurde eruiert, ob eine Korrelation von funktionalem Outcome und histologischen Veränderungen besteht. Dabei zeigte sich eine signifikante Korrelation neuroinflammatorischer Prozesse mit Einschränkungen im räumlichen Lernen und Umlernen, sowie Auffälligkeiten im Bereich des belohnungsmotivierten Verhaltens. Damit ordnet sich diese Arbeit in die bestehenden Erkenntnisse zur Pathophysiologie des SHTs ein und ergänzt diese weiter.
Die Vordere Kreuzband (VKB)-Ruptur ist eine häufige Verletzung, welche eine hohe individuelle und sozioökonomische Belastung verursacht. Eine etablierte Therapie ist die VKB-Plastik, problematisch sind jedoch die hohen Rerupturraten nach operativer Versorgung. In der Annahme, dass Mesenchymale Stammzellen (MSC) eine bedeutende Rolle für die Heilung spielen, sollte in der vorliegenden Arbeit untersucht werden, ob ein Zusammenhang zwischen Zahl und Qualität der aus dem VKB isolierten MSC sowie der Latenz zwischen Ruptur und Rekonstruktion besteht und so ein optimaler Therapiezeitraum eingegrenzt werden kann.
Zunächst erfolgte die Zellisolierung aus intraoperativ gewonnenen VKB-Biopsien. Je nach Latenz zwischen Ruptur und Operation wurden drei Gruppen (akute ≙ ≤ 30 d, subakute ≙ 31-90 d, verzögerte Rekonstruktion ≙ > 90 d) gebildet. Zum Nachweis von MSC wurden die Zellen hinsichtlich ihrer Plastikadhärenz, eines multipotenten Differenzierungspotentials sowie eines spezifischen Oberflächenantigenmusters (CD73+, CD90+, CD105+, CD34-) untersucht. Zudem wurde ihr Einflusses auf die biomechanischen und histologischen Eigenschaften eines analysiert.
Der Nachweis von MSC war in allen Gruppen möglich. Das Proliferationspotential war in Gruppe II am größten, ebenso der Anteil der MSC an allen Zellen. Er war 5,4% (4,6% - 6,3%, 95% CI; p < 0,001) höher als in Gruppe I und 18,9% (18,2% - 19,6%, 95% CI; p < 0,001) höher als in Gruppe III. In den mit Zellen kultivierten Bandkonstrukten konnte im Gegensatz zu zellfreien Konstrukten humanes Kollagen I nachgewiesen werden. Die Stabilität nahm bei Kultivierung mit Zellen ab.
Die Ergebnisse legen nahe, dass das Regenerationspotential bei subakuter VKB-Rekonstruktion (31-90 d) am höchsten ist. Potenziell ursächlich sind die Regeneration hemmende Entzündungsprozesse zu Beginn sowie degenerative Prozesse im längerfristigen Verlauf. Zudem konnte gezeigt werden, dass die isolierten Zellen die Eigenschaften eines Bandkonstruktes durch Bildung von Kollagen I und Reduktion der Stabilität im kurzfristigen Verlauf verändern und dementsprechend den Therapieerfolg beeinflussen könnten. Zur Verifizierung der Ergebnisse bedarf es weiterer Untersuchungen.
Carcinoembryonic antigen-related cell adhesion molecule 1 (CEACAM1) ist ein multifunktionales Zell-Zell Adhäsionsprotein, das in eine Vielzahl an zellulären Prozessen involviert ist, wie zum Beispiel der Differenzierung von Geweben, der Tumorsuppression, Metastasierung, Angiogenese und Apoptose. Außerdem hat es modulierende Eigenschaften auf die angeborene und erworbene Immunantwort. In der vorliegenden Arbeit charakterisierte ich initial die Lokalisation und die CEACAM1-exprimierenden Zelltypen im Auge und bestimmte quantitativ die Expression von Ceacam1 in der Retina und Choroidea zu unterschiedlichen Zeitpunkten.
Es zeigte sich hierbei, dass Ceacam1 zu allen untersuchten Zeitpunkten, sowohl während der Entwicklung als auch im adulten retinalen und choroidalen Gewebe nachweisbar war. Mittels Immunhistochemie konnte die Expression von CEACAM1 im Corneaepithel, den Gefäßen der Iris und des Ziliarkörpers, im nicht-pigmentierten Epithel des Ziliarkörpers, sowie in den retinalen und choroidalen Gefäßen nachgewiesen werden. Durch Doppelfärbung mit Kollagen IV konnte die endotheliale Expression von CEACAM1 in den Endothelzellen der Gefäße bestätigt werden.
Im zweiten Teil meiner Arbeit untersuchte ich die Funktion von CEACAM1 im Auge und verglich dazu wildtypische Retinae mit Cc1-/--Retinae. Es zeigten sich keine offensichtlichen morphologischen Veränderungen der retinalen Schichten und die anschließend durchgeführten morphometrischen Analysen der Schichtdicken der retinalen Neurone zeigte keine Anzeichen einer Neurodegeneration. Allerdings waren in Cc1-/--Retinae kleine Zysten und IBA1 positive, phagozytisch aktive Zellen im subneuroretinalen Raum, also dem Bereich zwischen RPE und den Außensegmenten der Photorezeptoren zu erkennen. Die anschließend durchgeführten Expressionsanalysen immunmodulierender Faktoren und von Mitgliedern des TGF-β-Signalwegs in retinalen und choroidealen Proben wildtypischer und Cc1-/--Mäusen zeigten keine veränderte Expression für Iba1, Ccl2 sowie Tnf-α. Jedoch konnten signifikant erhöhte Werte für TGF-β1 in der Gruppe der 2-4 als auch der Gruppe der 9 Monate alten Cc1-/--Retinae im Vergleich zu wildtypischen Retinae nachgewiesen werden. Basierend auf den Daten der vorliegenden Arbeit kann geschlussfolgert werden, dass die Deletion von CEACAM1 unter physiologischen Bedingungen die Struktur der Retina und Choroidea nicht offensichtlich beeinflusst. Allerdings führt die Deletion zu erhöhten Tgfβ1 Spiegeln in der Retina und zur Aktivierung und Akkumulation von IBA1 positiven Zellen im subneuroretinalen Raum.
Morbus Fabry ist eine X-chromosomal vererbte lysosomale Speichererkrankung, die mit einer verminderten Aktivität der -Galaktosidase A einhergeht. Daraus resultiert ein gestörter Abbau von Globotriaosylceramiden, die sich im Gewebe verschiedener Organsysteme einlagern und diese funktionell beeinträchtigen. Klinisch ist die renale, kardiovaskuläre und neurologische Beteiligung von besonderer Relevanz. Das Würzburger Fabry-Zentrum (FAZiT) hat als eine der ältesten Spezial-Einrichtungen zur Betreuung von Menschen mit Morbus Fabry in Deutschland Zugriff auf einen sich über 18 Jahre erstreckenden und 298 Patienten beinhaltenden Datensatz.
In dieser Arbeit wurde ein großes Fabry-Kollektiv zunächst im Hinblick auf Fabry spezifische Betreuung und aktuelle institutionelle Anbindung untersucht. In diesem Zusammenhang konnte in vier bisher nicht bekannten Fällen der Tod eines Patienten dokumentiert werden.
Anschließend erfolgte in einem Kollektiv von 187 Patienten eine statistische Darstellung definierter klinischer Basisparameter, sowie des Fabry-spezifischen klinischen Erscheinungsbildes, mit Schwerpunkt auf der kardialen Beteiligung. Mit speziellen Subgruppenanalysen wurden Verlaufsunterschiede zwischen lebendenden und bereits verstorbenen Patienten, sowie geschlechts- und genetisch bedingten Charakteristika dargestellt.
Von 187 Patienten verstarben 26 innerhalb von 18 Jahren trotz Fabry-spezifischer Therapie in 84% der Fälle. Die Hälfte der Todesfälle hatte eine kardiale Genese. Es wurde kein Todesfall mit renaler Genese dokumentiert. Die im FAZiT betreuten verstorbenen Patienten unterschritten das von Waldek et al.25 prognostizierte Sterbealter für Fabry-Patienten. Die Annahme, dass Fabry-Patienten eine, verglichen mit der Normalbevölkerung, reduzierte Lebenserwartung haben ließ sich in diesem Kollektiv bestätigen.
Signifikante Unterschiede kardialer Parameter, die auf eine Kardiomyopathie schließen lassen, ließen sich zwischen Frauen und Männern, sowie zwischen Frauen mit klassischer und nicht-klassischer Verlaufsform darstellen. Entgegen der Erwartung zeigten sich hier keine signifikanten Unterschiede zwischen Männern mit klassischer und Männern mit nicht-klassischer Verlaufsform. Eine Erklärung hierfür könnte das Vorliegen der N215S-Mutation in 55,6% in der Subgruppe der Männer mit nicht-klassischer Verlaufsform, die trotz nicht-klassischer Verlaufsform mit einer starken kardialen Beeinträchtigung einhergeht, sein.
Alle untersuchten Fabry-Patienten wiesen im altersabhängigen Vergleich mit der Normalbevölkerung eine erhöhte KHK-Prävalenz auf, die nicht eindeutig mit einer Erhöhung der kardiovaskulären Risikofaktoren erklärbar ist. Auffallend häufig waren die verstorbenen Fabry-Patienten mit einer Prävalenz von 30,8% betroffen.
Supportiv sowie das kardiovaskuläre Risiko beeinflussende Medikamente wurden ebenfalls dokumentiert, wobei unterschiedliche potenzielle Indikationsstellungen einen Rückschluss auf die klinische Symptomatik der Patienten verhindern.
In dieser Arbeit konnte ein besonders großes Kollektiv an Menschen mit Morbus Fabry über einen langen Zeitraum nachbeobachtet werden. Insbesondere die Gegenüberstellung von lebenden und verstorbenen Probanden, als auch die Verlaufs-/ und geschlechtsspezifischen Subgruppenvergleiche stellen eine Besonderheit dar. Vor allem bei chronisch erkrankten Menschen sind eine lebenslange Betreuuung und Begleitung der Krankheit von höchster Relevanz. Aus diesem Grund könnten die Auswertung der in dieser Arbeit erhobenen Daten und Erkenntnisse zur Verbesserung der zukünftigen Betreuung und Therapie von Menschen mit Morbus Fabry beitragen.
In dieser Arbeit geht es um die Phosphoglykolatphosphatase (PGP), die als Phosphatase vom Haloazid Dehalogenase-Typ (HAD-Phosphatase) zu der ubiquitär vorkommenden Superfamilie der HAD-Hydrolasen gehört. In der Literatur ist eine in vitro Phosphatase-Aktivität gegenüber 2-Phospho-L-Laktat (2PL), 4-Phospho-D-Erythronat (4PE), Phosphoglykolat (PG) und Glycerol-3-Phosphat (G3P) beschrieben. 2PL und 4PE entstehen in Nebenreaktionen während der Glykolyse und hemmen bei Akkumulation die Glykolyse bzw. den Pentosephosphatweg. PG kann auch in einer Nebenreaktion während der Glykolyse oder im Rahmen der Reparatur von oxidativen DNA-Schäden entstehen. G3P entsteht aus Dihydroxyacetonphosphat und bildet das Kohlenhydratgerüst der Triacylglyceride (TAG). Zelluläre Studien konnten Hinweise auf die Regulierung des epidermalen wachstumsfaktor-(EGF-)induzierten Zytoskelettumbaus durch die PGP liefern und die Untersuchung von Mäusen mit PGP-Inaktivierung zeigte einen Einfluss auf die Zellproliferation und embryonale Entwicklung. Die Regulation der PGP-Expression führte zu Veränderungen im Kohlenhydrat- und Fettstoffwechsel.
Die Untersuchung der PGP-Funktionen erfolgte bislang ausschließlich mit genetischen Ansätzen. Aufgrund von möglichen Kompensationsmechanismen und Off-Target-Effekten müssen genetische und pharmakologische Methoden als sich ergänzende Ansätze verstanden werden. Um die Funktionen der PGP besser zu verstehen, fokussiert sich die vorliegende Arbeit auf die gezielte pharmakologische PGP-Inhibition. In Vorarbeiten wurden 41.000 Moleküle gescreent und fünf potentielle Inhibitoren identifiziert. Ziele dieser Arbeit waren zum einen die Implementierung der Inhibitor # 1-Behandlung in der Zellkultur, zum anderen die Charakterisierung der PGP-Hemmung durch Inhibitor # 48 und die Durchführung erster Selektivitätstestungen mit Inhibitor # 48.
Zusammenfassend kann festgehalten werden, dass Inhibitor # 1 in der Lage ist, die endogene PGP in Zelllysaten der murinen spermatogonialen Zelllinie (GC1) zu hemmen. Unter bestimmten Bedingungen führte die Inhibitor # 1-Behandlung der GC1-Zellen zur Hemmung der PGP. Erste Analysen zellulärer Inhibitoreffekte konnten eine Steigerung der TAG-Konzentration in behandelten GC1-Zellen nachweisen. Die PGP-Hemmung durch Inhibitor # 48 wurde als unkompetitive Inhibition charakterisiert und es zeigten sich keine relevanten Inhibitoreffekte auf die HAD-Phosphatasen Magnesium-abhängige Phosphatase 1 (MDP1), Lysin-Histidin-Pyrophosphat-Phosphatase (LHPP) und Polynukleotidase 5'-Kinase/3'-Phosphatase (PnkP). Dagegen konnte eine Aktivitätssteigerung von Phospho 2 beobachtet werden. Die vorliegende Arbeit liefert somit erste Erkenntnisse über die Anwendung des PGP-Inhibitors # 1 in der Zellkultur und schafft die Grundlage für nachfolgende Untersuchungen mit Inhibitor # 48. Weitere Experimente sind notwendig, die die Inhibitorbehandlung in der Zellkultur optimieren und die Selektivität weiter charakterisieren, um mithilfe der Inhibitoren neue Erkenntnisse über die physiologische und pathophysiologische Rolle der PGP gewinnen zu können.
Die bariatrische Chirurgie ist momentan die einzige Therapieoption der morbiden Adipositas mit der eine langfristige Gewichtsreduktion erreicht werden kann. Unter den Operationsmethoden gilt der RYGB als eine der wirksamsten Behandlungen bezogen auf den Gewichtsverlust und die Verbesserung von Begleiterkrankungen wie dem Diabetes mellitus Typ 2. Darüber hinaus belegt eine wachsende Zahl an Veröffentlichungen, dass der RYGB den Zustand chronischer Entzündung, wie er typischerweise mit Adipositas einhergeht, verringern kann. Diese sogenannte Endotoxämie geht unter anderem mit einer gestörten Integrität der intestinalen Epithelbarriere einher. Ziel der vorliegenden Arbeit war es eine Analyse der Veränderungen von für die Darmbarriere wichtigen Junktionsproteinen vorzunehmen, um eine Grundlage für künftige mechanistische Untersuchungen zu schaffen. Dafür wurden die Veränderungen von Barriereproteinen in Vollwandresektaten des Duodenums, des Jejunums, des Ileums sowie des Kolons von Ratten, die einen RYGB erhalten hatten, mittels Western Blot Untersuchungen quantifiziert. Als Kontrollgruppe dienten schein-operierte Ratten. Es kam zu tiefgreifenden Veränderungen der analysierten Barriereproteine in den Vollwandresektaten. Interessanterweise unterschieden sich die Verteilungsmuster der Veränderungen der Barriereproteinte deutlich zwischen den einzelnen Darmregionen. Um herauszufinden, ob diese Veränderungen durch regionale Veränderungen der Mikroumgebung nach RYGB- Operation induziert wurden, wurden im reduktionistischen Zellkultursystem Stuhl- Transferexperimente durchgeführt. Caco2-Zellkulturen dienten hierbei als Modell für die intestinale epitheliale Barriere. Es wurden funktionelle Messungen und quantitative Analysen der Veränderungen der Barriereproteine der Zellkultur durchgeführt. Die Funktionsmessungen zeigten, dass der Inhalt des Duodenums, des Jejunums sowie des Kolons deutliche barrierestabilisierende Effekte auf die Caco2-Zellmonolayer hatte. Zudem zeigten sich tiefgreifende Veränderungen der untersuchten Barriereproteine. Zusammenfassend wurde in der vorliegenden Arbeit erstmals eine regionenspezfische Regulation der intestinalen Barriereproteine in Korrelation mit funktionellen Messungen nach RYGB nachgewiesen.
Die Coxarthrose ist eine häufige degenerative Erkrankung, deren Prävalenz mit steigendem Lebensalter zunimmt. Durch die steigende Lebenserwartung der Bevölkerung nimmt dementsprechend auch die Anzahl an Patienten mit Coxarthrose zu. Die Therapie besteht konservativ u.a. aus Physiotherapie und Analgesie. Reichen die konservativen Maßnahmen nicht aus, steht der totale Gelenkersatz in Form eine Totalendoprothese zur Verfügung. Bisher gibt es keine regenerativen Therapien, die den arthrotisch degenerierten Gelenkknorpel ersetzen können. Durch die Fähigkeit, sich in Knochen-, Fett- und Knorpelzellen zu differenzieren, ist in der Vergangenheit die mesenchymale Stammzelle in den Fokus der Forschung gerückt. Es wird vermutet, dass diese Stammzellpopulation das Potential besitzen könnte, den defekten Knorpel zu ersetzen. Diese Zellpopulation ist in vivo jedoch noch nicht ausreichend charakterisiert und es fehlen belastbare Daten, wie sich die (pathologische) Umgebung auf die MSC auswirkt. In den letzten Jahren sind diverse Populationen von MSC mit unterschiedlichen Eigenschaften entdeckt worden. Um die subchondralen Populationen aus arthrotischen Hüften genauer zu charakterisieren, wurde hier Reaming aus dem Acetabulum (ein bei der Hüft-TEP Implantation anfallendes chirurgisches Abfallprodukt) untersucht. Die enthaltenen Zellen wurden im Hinblick auf die zelluläre Signatur und donorenbezogenen Eigenschaften untersucht. Parameter, die untersucht wurden, waren das Alter, das Geschlecht, der BMI und der K&L Score. Außerdem wurde die zelluläre Signatur anhand bestimmter Oberflächenmarker untersucht. Weiterhin wurden die isolierten und kultivierten MSC untersucht, ob sie sich bzgl. ihrer Fähigkeit unterscheiden, sich in die adipogene bzw. osteogene Linie zu differenzieren. Eine Eigenschaft, die bisher bei allen Populationen von möglichen MNC bzw. MSC nachgewiesen wurde, ist ihre Fähigkeit Kolonien zu bilden - sog. CFU-F. Bei den durchgeführten Untersuchungen zeigte sich, dass aus allen erhaltenen Proben MSC in Form von CFU-F gewonnen werden konnten. Weiterhin waren alle Zellen in der Lage adipogen bzw. osteogen zu differenzieren. Signifikante Unterschiede in Bezug auf die Differenzierungseigenschaften konnten nicht festgestellt werden. Eine höhere CFU-F Bildung konnte aus dem Reaming von männlichen Donoren nachgewiesen werden. Weiterhin konnte gezeigt werden, dass sich eine signifikant höhere Anzahl CD271-exprimierender Zellen im Reaming von männlichen Donoren befand. Ebenfalls konnte eine signifikante Zunahme für CD45- CD13+ CD105+ Zellen mit steigendem BMI nachgewiesen werden.
Durch diese umfassende Versuchsreihe konnte dargelegt werden, dass es in arthrotischen Hüften Unterschiede in der MSC Zahl im Vergleich der Geschlechter gibt und dass bestimmte Populationen von MSC mit steigendem BMI zunehmen. Um diese Ergebnisse einordnen zu können ist es in Zukunft notwendig zu untersuchen, ob diese Unterschiede allein durch die Arthrose bedingt sind oder ob dieser Unterschied auch im gesunden Knochenmark vorliegt.
In dieser Arbeit wurde die Krankheitsprogression im Parkinson-Mausmodell hm2α-SYN-39 mit zunehmendem Alter charakterisiert. Die Mäuse wurden in 4 Altersgruppen (2-3, 7-8, 11-12, 16-17 Monate) mit motorischen Verhaltenstests auf einen Parkinson-Phänotyp untersucht. Zudem erfolgten Untersuchungen des dopaminergen Systems zur Detektion von neurochemischen Veränderungen und einer Neurodegeneration im nigrostriatalen Trakt. Weiterhin wurden neuroinflammatorische Prozesse des adaptiven und angeborenen IS in der SN und im Striatum mittels immunhistochemischer Färbungen beurteilt.
Ein Parkinson-Phänotyp in diesem Mausmodell zeigte sich nur leicht ausgeprägt, sodass der Rotarod- und Zylinder-Test lediglich den Hinweis auf eine nicht-signifikante Einschränkung der Motorik erbrachte. Dennoch ergab die stereologische Quantifizierung TH- und Nissl-positiver Zellen in der SNpc der hm2α-SYN-39 Mäuse eine altersabhängige, signifikant-progrediente Reduktion der dopaminergen Neurone mit zunehmendem Alter. Eine signifikant niedrigere TH-positive Zellzahl dieser tg Mäuse zeigte sich ab einem Alter von 16-17 Monaten verglichen zu gleichaltrigen wt Tieren. Dagegen war die Neurodegeneration im Striatum etwas weniger ausgeprägt. Die tg Mäuse präsentierten im Alter von 16-17 Monaten eine nicht-signifikante Erniedrigung der dopaminergen Terminalen verglichen zu gleichaltrigen wt Tieren. Ein DA-Mangel im Striatum der tg Mäuse konnte mittels HPLC bestätigt werden. Bis zum Alter von 16-17 Monaten wurde eine signifikante Reduktion der DA-Level von 23,2 % verglichen zu gleichaltrigen wt Mäusen gezeigt. Außerdem erniedrigt waren die striatalen Level von NA und 5-HAT bei tg Mäusen, passend zu den bisherigen Ergebnissen bei Parkinson-Patienten.
Immunhistochemische Untersuchungen einer Neuroinflammation im nigrostriatalen Trakt ergaben eine tendenziell erhöhte Infiltration von CD4- und CD8-positiven T-Zellen bei hm2α-SYN-39 Mäusen mit zunehmendem Alter, wobei die Infiltration CD8-positiver Zellen ausgeprägter war als bei CD4-positiven Zellen. Eine noch deutlichere neuroinflammatorische Reaktion zeigte das angeborene IS. Hierbei ergab die immunhistologische Quantifizierung CD11b-positiver mikroglialer Zellen einen hochsignifikanten Anstieg im nigrostriatalen Trakt bei hm2α-SYN-39 Mäusen schon im jungen Alter.
Zusammenfassend präsentierte dieses Parkinson-Mausmodell eine langsam-progrediente Parkinson-Pathologie mit begleitender Neuroinflammation im nigrostriatalen Trakt während des Alterns, wobei die Immunantwort der mikroglialen Zellen zu einem früheren Zeitpunkt einsetzte als die T-Zellinfiltration und Neurodegeneration. Dieses Mausmodell bietet zahlreiche Möglichkeiten zur zukünftigen Erforschung der Pathophysiologie beim MP. Generell weist diese Arbeit auf eine bedeutende Rolle neuroinflammatorischer Prozesse in der Krankheitsprogression der Parkinsonerkrankung hin und soll dazu ermutigen Neuroinflammation durchaus intensiver in tg Tiermodellen zu untersuchen.
Wenige Publikationen beschäftigen sich mit der diastolischen Dysfunktion (DD) bei Schlaganfallpatienten. Um diese Datenlücke zu bearbeiten, wurden, im Rahmen der SICFAIL-Kohortenstudie, Schlaganfallpatienten hinsichtlich des Vorhandenseins einer diastolischen Funktionsstörung in Anlehnung an, zum Zeitpunkt des Verfassens dieser Arbeit, aktuelle Empfehlungen anhand echokardiographischer Parameter eingeteilt und charakterisiert. Zudem konnten Erkenntnisse über Einflussfaktoren gewonnen werden, die mit einer DD assoziiert sind.
Dabei zeigte sich, dass Schlaganfallpatienten mit einer diastolischen Funktionsstörung älter sind als Schlaganfallpatienten ohne DD und dass mit steigendem Lebensalter auch die Chance für eine DD ansteigt. Zudem bestand häufiger eine medikamentös behandelte aber auch eine unbehandelte arterielle Hypertonie, die mit dem Auftreten einer DD assoziiert ist. Diese Erkenntnisse decken sich mit den Ergebnissen verschiedener Arbeitsgruppen, die sich mit dem Vorkommen der DD in der Allgemeinbevölkerung beschäftigt haben.
Die im Rahmen dieser Arbeit ermittelte Prävalenz der diastolischen Funktionsstörung bei Schlaganfallpatienten ist deutlich niedriger als diejenige, die in anderen Forschungsarbeiten herausgefunden wurde. Unterschiedliche Definitionen der DD können ein Grund dafür sein.
Es bedarf aber weitere Forschungsarbeit in diese Richtung genauso wie eine stärkere Etablierung der aktuellen Definitionsgrundlagen der DD um umfassende und einheitliche Erkenntnisse über die diastolische Funktionsstörung bei Schlaganfallpatienten und auch in der Allgemeinbevölkerung zu erlangen. Zudem sollte ein weiteres Forschungsziel sein, mögliche Einflüsse der DD auf das Outcome der Patienten nach ischämischem Schlaganfall zu identifizieren, um diese gezielt in die Erarbeitung von Präventionsmaßnahmen aufzunehmen.
Die Rolle des Immunsystems nach MI hat innerhalb der letzten Jahrzehnte immer mehr Aufmerksamkeit erfahren, trotzdem herrschen weiterhin einige Unklarheiten. Daher war es Ziel dieser Arbeit, das Verhalten der T-Zellen nach MI im Mausmodell näher zu betrachten und zu analysieren. Dafür wurde einerseits mittels Durchflusszytometrie die T-Zell-Immunantwort im Herzen und in verschiedenen lymphatischen Organen mit Fokus auf pro- und antiinflammatorische Zytokine und deren Transkriptionsfaktoren genauer analysiert und andererseits ein Protokoll etabliert, um die T-Zellen im Herzen und in den Lymphknoten mittels Lichtblattmikroskopie sichtbar zu machen.
Dabei konnte festgestellt werden, dass die Expression von LAP, welches nicht-kovalent an das antiinflammatorische Zytokin TGF-ß1 gebunden ist und das wichtig für eine ausgeglichene Immunantwort ist, indem es überschießende Entzündungsreaktionen verhindert, in T-Zellen im Herzen nach MI im Vergleich zu naiven und scheinoperierten Mäusen signifikant hochreguliert war. Dieses Ergebnis konnte nur im Herzen und in keinem anderen der untersuchten Organe erzielt werden, weshalb es sich somit um eine lokale Immunreaktion handeln muss, die nur im Herzen nach MI stattfindet. Eine weitere Besonderheit war, dass die Häufigkeit des Vorkommens an Foxp3+ Treg im Herzen im Vergleich zu den anderen untersuchten Organen durchgehend am höchsten war, sowohl bei den Mäusen nach MI als auch bei naiven und scheinoperierten Mäusen. Dies unterstreicht, dass Foxp3+ Treg im Herzen eine wichtige Rolle spielen.
Dank der Verbesserung des Protokolls zur bildlichen Darstellung von T-Zellen im Herzen konnte gezeigt werden, dass sich diese nach MI insbesondere im Infarktgewebe befinden und dort relativ gleichmäßig verteilt sind. Außerdem konnten die mediastinalen Lymphknoten im Ganzen dargestellt und die einzelnen T-Zellen sichtbar gemacht werden.
Insgesamt lässt sich sagen, dass durch die vorliegende Arbeit neue Erkenntnisse zur Charakterisierung der T-Zell-Immunantwort nach MI im Mausmodell hinzugewonnen werden konnten. Die LAP+ T-Zellen scheinen nach MI im Herzen eine wichtige Rolle zu spielen, weshalb die Funktion dieser Zellen im Reparaturprozess nach MI in zukünftigen Versuchen genauer betrachtet werden sollte. Außerdem wurde der Grundstein zur Anfärbung und Darstellung von T-Zellen in Herzen und in Lymphknoten mittels Lichtblattmikroskopie gelegt, weshalb daran weitergearbeitet werden sollte, um auch andere Immunzellen neben den T-Zellen zeigen zu können. Dadurch können weitere Hinweise auf das Zusammenspiel der Immunzellen nach MI erhalten werden, um die immunologischen Vorgänge immer besser verstehen zu können.
The present cumulative dissertation summarizes three clinical studies, which examine
subgroups of patients within the fibromyalgia syndrome (FMS). FMS entails chronic pain and
associated symptoms, and its pathophysiology is incompletely understood (1). Previous studies
show that there is a subgroup of patients with FMS with objective histological pathology of the
small nerve fibers of the peripheral nervous system (PNS). Another subgroup of FMS patients
does not show any signs of pathological changes of the small nerve fibers. The aim of this
dissertation was to compare FMS patients with healthy controls, and these two FMS subgroups
for differences in the central nervous system (CNS) in order to explore possible interactions
between PNS and the CNS. Regarding the CNS, differences of FMS patients with healthy
controls have already been found in studies with small sample sizes, but no subgroups have yet
been identified. Another aim of this thesis was to test whether the subgroups show a different
response to different classes of pain medication. The methods used in this thesis are structural
and functional magnetic resonance imaging (MRI), magnetic resonance diffusion imaging and
magnetic resonance spectroscopy. For the evaluation of clinical symptoms, we used
standardized questionnaires. The subgroups with and without pathologies of the PNS were
determined by skin biopsies of the right thigh and lower leg based on the intraepidermal nerve
fiber density (IENFD) of the small nerve fibers.
1) In the first MRI study, 43 female patients with the diagnosis of FMS and 40 healthy
control subjects, matched in age and body mass index, were examined with different MRI
sequences. Cortical thickness was investigated by structural T1 imaging, white matter integrity
by diffusion tensor imaging and functional connectivity within neuronal networks by functional
resting state MRI. Compared to the controls, FMS patients had a lower cortical volume in
bilateral frontotemporoparietal regions and the left insula, but a higher cortical volume in the
left pericalcarine cortex. Compared to the subgroup without PNS pathology, the subgroup with
PNS pathology had lower cortical volume in both pericalcarine cortices. Diffusion tensor
imaging revealed an increased fractional anisotropy (FA) of FMS patients in corticospinal
pathways such as the corona radiata, but also in regions of the limbic systems such as the fornix
and cingulum. Subgroup comparison again revealed lower mean FA values of the posterior
thalamic radiation and the posterior limb of the left internal capsule in the subgroup with PNS
pathology. In the functional connectivity analysis FMS patients, compared to controls, showed
a hypoconnectivity between the right median frontal gyrus and the posterior cerebellum and
the right crus cerebellum, respectively. In the subgroup comparisons, the subgroup with PNS
pathology showed a hyperconnectivity between both inferior frontal gyri, the right posterior
parietal cortex and the right angular gyrus. In summary, these results show that differences in
brain morphology and functional connectivity exist between FMS patients with and without
PNS pathology. These differences were not associated with symptom duration or severity and,
in some cases, have not yet been described in the context of FMS. The differences in brain
morphology and connectivity between subgroups could also lead to a differential response to
treatment with centrally acting drugs. Further imaging studies with FMS patients should take
into account this heterogeneity of FMS patient cohorts.
2) Following the results from the first MRI study, drug therapies of FMS patients and
their treatment response were compared between PNS subgroups. As there is no licensed drug
for FMS in Europe, the German S3 guideline recommends amitriptyline, duloxetine and
pregabalin for temporary use. In order to examine the current drug use in FMS patients in
Germany on a cross-sectional basis, 156 patients with FMS were systematically interviewed.
The drugs most frequently used to treat pain in FMS were non-steroidal anti-inflammatory
drugs (NSAIDs) (28.9%), metamizole (15.4%) and amitriptyline (8.8%). Pain relief assessed by
patients on a numerical rating scale from 0-10 averaged 2.2 points for NSAIDs, 2.0 for
metamizole and 1.5 for amitriptyline. Drugs that were discontinued for lack of efficacy and not
for side effects were acetaminophen (100%), flupirtine (91.7%), selective serotonin reuptake
inhibitors (81.8%), NSAIDs (83.7%) and weak opioids (74.1%). Patients were divided into
subgroups with and without PNS pathology as determined by skin biopsies. We found no
differences in drug use and effect between the subgroups. Taken together, these results show
that many FMS patients take medication that is not in accordance with the guidelines. The
reduction of symptoms was best achieved with metamizole and NSAIDs. Further longitudinal
studies on medication in FMS are necessary to obtain clearer treatment recommendations.
3) Derived from previous pharmacological and imaging studies (with smaller case
numbers), there is a hypothesis in the FMS literature that hyperreactivity of the insular cortex
may have an impact on FMS. The hyperreactivity seems to be due to an increased concentration
of the excitatory neurotransmitter glutamate in the insular cortex of FMS patients. The
hypothesis is supported by magnetic resonance spectroscopy studies with small number of
cases, as well as results from pharmacological studies with glutamate-inhibiting medication.
Studies from animal models have also shown that an artificially induced increase in glutamate
in the insular cortex can lead to reduced skin innervation. Therefore, the aim of this study was
to compare glutamate and GABA concentrations in the insular cortex of FMS patients with
those of healthy controls using magnetic resonance imaging. There was no significant
difference of both neurotransmitters between the groups. In addition, there was no correlation
between the neurotransmitter concentrations and the severity of clinical symptoms. There
were also no differences in neurotransmitter concentrations between the subgroups with and
without PNS pathology. In conclusion, our study could not show any evidence of a correlation
of glutamate and GABA concentrations with the symptoms of FMS or the pathogenesis of
subgroups with PNS pathologies.
This work developed during the first funding period of the subproject B05 in the framework of the interdisciplinary research consortium TRR 225 ‘From the Fundamentals of Biofabrication toward functional Tissue Models’ and was part of a cooperation between the Orthopedic Department represented by Prof. Dr. Regina Ebert and the Institute of Organic Chemistry represented by Prof. Dr. Jürgen Seibel.
This project dealed with cellular behavior during the bioprinting process and how to influence it by modifying the cell glycocalyx with functional target molecules. The focus was on the impact of potential shear stress, that cells experience when they get processed in thermoresponsive bioinks, and a way to increase the cell stiffness via metabolic glycoengineering to attenuate shear forces. For the characterization of the metabolic glycoengineering, four different peracetylated and four non-acetylated modified monosaccharides (two mannose and two sialic acid sugars) were tested in primary human mesenchymal stromal cells (hMSC) and telomerase-immortalized hMSC (hMSC-TERT). Viability results demonstrated a dose-dependent correlation for all sugars, at which hMSC-TERT seemed to be more susceptible leading to lower viability rates. The assessment of the incorporation efficiencies was performed by click chemistry using fluorescent dyes and revealed also a dose-dependent correlation for all mannose and sialic acid sugars, while glucose and galactose variants were not detected in the glycocalyx. However, incorporation efficiencies were highest when using mannose sugars in the primary hMSC. A subsequent analysis of the temporal retention of the incorporated monosaccharides showed a constant declining fluorescence signal up to 6 d for azido mannose in hMSC-TERT, whereas no signal could be detected for alkyne mannose after 2 d. Investigation of the differentiation potential and expression of different target genes revealed no impairment after incubation with mannose sugars, indicating a normal phenotype for hMSC-TERT. Following the successful establishment of the method, either a coumarin derivative or an artificial galectin 1 ligand were incorporated into the cell glycocalyx of hMSC-TERT as functional target molecule. The biophysical analysis via shear flow deformation cytometry revealed a slightly increased cell stiffness and lowered fluidity for both molecules. A further part of this project aimed to control lectin-mediated cell adhesion by artificial galectin 1 ligands. As that hypothesis was settled in the work group of Prof. Dr. Jürgen Seibel, this work supported with an initial characterization of galectin 1 as part of the hMSC biology. A stable galectin 1 expression at gene and protein level in both hMSC and hMSC-TERT could be confirmed, at which immunocytochemical stainings could detect the protein only in the glycocalyx. The treatment of hMSC-TERT with a galectin 1 ligand in different concentrations did not show an altered gene expression of galectin 1. However, these first data in addition to the investigation of stiffness confirmed the applicability of specific and artificial
IV
galectin 1 ligands in biofabrication approaches to alter cell properties of hMSC. To conclude, metabolic glycoengineering has been successfully implemented in hMSC and hMSC-TERT to introduce glycocalyx modifications which reside there for several days. A proof of concept was carried out by the increase of cell stiffness and fluidity by the incorporation of a coumarin derivative or an artificial galectin 1 ligand.
For the characterization of shear stress impact on cells after printing in thermoresponsive bioinks, the processing of hMSC-TERT (mixing or additionally printing) with Pluronic F127 or Polyoxazoline-Polyoxazine (POx-POzi) polymer solution was investigated. While there were no changes in viability when using POx-POzi bioink, processing with Pluronic F127 indicated slightly lower viability and increased apoptosis activity. Assessment of cellular responses to potential shear stress showed no reorganization of the cytoskeleton independent of the bioink, but highly increased expression of the mechanoresponsive proto-oncogene c Fos which was more pronounced when using Pluronic F127 and just mixed with the bioinks. Interestingly, processing of the mechanoresponsive reporter cell line hMSC-TERT-AP1 revealed slightly elevated mechanotransduction activity when using POx-POzi polymer and just mixed with the bioinks as well. In conclusion, hMSC-TERT embedded in thermoresponsive bioinks might shortly experience shear stress during the printing process, but that did not lead to remarkable cell damage likely due to the rheological properties of the bioinks. Furthermore, the printing experiments also suggested that cells do not sense more shear stress when additionally printed.
Characterization of binding properties of ephedrine derivatives to human alpha-1-acid glycoprotein
(2023)
Most drugs, especially those with acidic or neutral moieties, are bound to the plasma protein albumin, whereas basic drugs are preferentially bound to human alpha-1-acid glycoprotein (AGP). The protein binding of the long-established drugs ephedrine and pseudoephedrine, which are used in the treatment of hypotension and colds, has so far only been studied with albumin. Since in a previous study a stereoselective binding of ephedrine and pseudoephedrine to serum but not to albumin was observed, the aim of this study was to check whether the enantioselective binding behavior of ephedrine and pseudoephedrine, in addition to the derivatives methylephedrine and norephedrine, is due to AGP and to investigate the influence of their different substituents and steric arrangement. Discontinuous ultrafiltration was used for the determination of protein binding. Characterization of ligand-protein interactions of the drugs was obtained by saturation transfer difference nuclear magnetic resonance spectroscopy. Docking experiments were performed to analyze possible ligand-protein interactions. The more basic the ephedrine derivative is, the higher is the affinity to AGP. There was no significant difference in the binding properties between the individual enantiomers and the diastereomers of ephedrine and pseudoephedrine.
While glioblastoma (GBM) is still challenging to treat, novel immunotherapeutic approaches have shown promising effects in preclinical settings. However, their clinical breakthrough is hampered by complex interactions of GBM with the tumor microenvironment (TME). Here, we present an analysis of TME composition in a patient-derived organoid model (PDO) as well as in organotypic slice cultures (OSC). To obtain a more realistic model for immunotherapeutic testing, we introduce an enhanced PDO model. We manufactured PDOs and OSCs from fresh tissue of GBM patients and analyzed the TME. Enhanced PDOs (ePDOs) were obtained via co-culture with PBMCs (peripheral blood mononuclear cells) and compared to normal PDOs (nPDOs) and PT (primary tissue). At first, we showed that TME was not sustained in PDOs after a short time of culture. In contrast, TME was largely maintained in OSCs. Unfortunately, OSCs can only be cultured for up to 9 days. Thus, we enhanced the TME in PDOs by co-culturing PDOs and PBMCs from healthy donors. These cellular TME patterns could be preserved until day 21. The ePDO approach could mirror the interaction of GBM, TME and immunotherapeutic agents and may consequently represent a realistic model for individual immunotherapeutic drug testing in the future.
During the COVID-19 pandemic, social distancing restricted psycho-oncological care. Therefore, this secondary analysis examines the changes in anxiety, fear of progression, fatigue, and depression in cancer patients after a video-based eHealth intervention. We used a prospective observational design with 155 cancer patients with mixed tumor entities. Data were assessed before and after the intervention and at a three-month follow-up using self-reported questionnaires (GAD-7, FOP-Q-SF, PHQ-8, and EORTC QLQ-FA12). The eight videos included psychoeducation, Acceptance and Commitment Therapy elements, and yoga and qigong exercises. The results showed that three months after finishing the video-based intervention, participants showed significantly reduced fear of progression (d = −0.23), depression (d = −0.27), and fatigue (d = −0.24) compared to the baseline. However, there was no change in anxiety (d = −0.09). Findings indicated marginal improvements in mental distress when using video-based intervention for cancer patients for up to three months, but long-term effectiveness must be confirmed using a controlled design.
Although bariatric surgery is known to change the metabolome, it is unclear if this is specific for the intervention or a consequence of the induced bodyweight loss. As the weight loss after Roux-en-Y Gastric Bypass (RYGB) can hardly be mimicked with an evenly effective diet in humans, translational research efforts might be helpful. A group of 188 plasma metabolites of 46 patients from the randomized controlled Würzburg Adipositas Study (WAS) and from RYGB-treated rats (n = 6) as well as body-weight-matched controls (n = 7) were measured using liquid chromatography tandem mass spectrometry. WAS participants were randomized into intensive lifestyle modification (LS, n = 24) or RYGB (OP, n = 22). In patients in the WAS cohort, only bariatric surgery achieved a sustained weight loss (BMI −34.3% (OP) vs. −1.2% (LS), p ≤ 0.01). An explicit shift in the metabolomic profile was found in 57 metabolites in the human cohort and in 62 metabolites in the rodent model. Significantly higher levels of sphingolipids and lecithins were detected in both surgical groups but not in the conservatively treated human and animal groups. RYGB leads to a characteristic metabolomic profile, which differs distinctly from that following non-surgical intervention. Analysis of the human and rat data revealed that RYGB induces specific changes in the metabolome independent of weight loss.
Various types of cancer involve aberrant cell cycle regulation. Among the pathways responsible for tumor growth, the YAP oncogene, a key downstream effector of the Hippo pathway, is responsible for oncogenic processes including cell proliferation, and metastasis by controlling the expression of cell cycle genes. In turn, the MMB multiprotein complex (which is formed when B-MYB binds to the MuvB core) is a master regulator of mitotic gene expression, which has also been associated with cancer. Previously, our laboratory identified a novel crosstalk between the MMB-complex and YAP. By binding to enhancers of MMB target genes and promoting B-MYB binding to promoters, YAP and MMB co-regulate a set of mitotic and cytokinetic target genes which promote cell proliferation. This doctoral thesis addresses the mechanisms of YAP and MMB mediated transcription, and it characterizes the role of YAP regulated enhancers in transcription of cell cycle genes.
The results reported in this thesis indicate that expression of constitutively active, oncogenic YAP5SA leads to widespread changes in chromatin accessibility in untransformed human MCF10A cells. ATAC-seq identified that newly accessible and active regions include YAP-bound enhancers, while the MMB-bound promoters were found to be already accessible and remain open during YAP induction. By means of CRISPR-interference (CRISPRi) and chromatin immuniprecipitation (ChIP), we identified a role of YAP-bound enhancers in recruitment of CDK7 to MMB-regulated promoters and in RNA Pol II driven transcriptional initiation and elongation of G2/M genes. Moreover, by interfering with the YAP-B-MYB protein interaction, we can show that binding of YAP to B-MYB is also critical for the initiation of transcription at MMB-regulated genes. Unexpectedly, overexpression of YAP5SA also leads to less accessible chromatin regions or chromatin closing. Motif analysis revealed that the newly closed regions contain binding motifs for the p53 family of transcription factors. Interestingly, chromatin closing by YAP is linked to the reduced expression and loss of chromatin-binding of the p53 family member Np63. Furthermore, I demonstrate that downregulation of Np63 following expression of YAP is a key step in driving cellular migration.
Together, the findings of this thesis provide insights into the role of YAP in the chromatin changes that contribute to the oncogenic activities of YAP. The overexpression of YAP5SA not only leads to the opening of chromatin at YAP-bound enhancers which together with the MMB complex stimulate the expression of G2/M genes, but also promotes the closing of chromatin at ∆Np63 -bound regions in order to lead to cell migration.
Changes in body perception often arise when observers are confronted with related yet discrepant multisensory signals. Some of these effects are interpreted as outcomes of sensory integration of various signals, whereas related biases are ascribed to learning-dependent recalibration of coding individual signals. The present study explored whether the same sensorimotor experience entails changes in body perception that are indicative of multisensory integration and those that indicate recalibration. Participants enclosed visual objects by a pair of visual cursors controlled by finger movements. Then either they judged their perceived finger posture (indicating multisensory integration) or they produced a certain finger posture (indicating recalibration). An experimental variation of the size of the visual object resulted in systematic and opposite biases of the perceived and produced finger distances. This pattern of results is consistent with the assumption that multisensory integration and recalibration had a common origin in the task we used.
The emerging serverless computing may meet Edge Cloud in a beneficial manner as the two offer flexibility and dynamicity in optimizing finite hardware resources. However, the lack of proper study of a joint platform leaves a gap in literature about consumption and performance of such integration. To this end, this paper identifies the key questions and proposes a methodology to answer them.
Despite fine tuning voluntary movement as the most prominently studied function of the cerebellum, early human studies suggested cerebellar involvement emotion regulation. Since, the cerebellum has been associated with various mood and anxiety-related conditions. Research in animals provided evidence for cerebellar contributions to fear memory formation and extinction. Fear and anxiety can broadly be referred to as defensive states triggered by threat and characterized by multimodal adaptations such as behavioral and cardiac responses integrated into an intricately orchestrated defense reaction. This is mediated by an evolutionary conserved, highly interconnected network of defense-related structures with functional connections to the cerebellum. Projections from the deep cerebellar nucleus interpositus to the central amygdala interfere with retention of fear memory. Several studies uncovered tight functional connections between cerebellar deep nuclei and pyramis and the midbrain periaqueductal grey. Specifically, the fastigial nucleus sends direct projections to the ventrolateral PAG to mediate fear-evoked innate and learned freezing behavior. The cerebellum also regulates cardiovascular responses such as blood pressure and heart rate-effects dependent on connections with medullary cardiac regulatory structures. Because of the integrated, multimodal nature of defensive states, their adaptive regulation has to be highly dynamic to enable responding to a moving threatening stimulus. In this, predicting threat occurrence are crucial functions of calculating adequate responses. Based on its role in prediction error generation, its connectivity to limbic regions, and previous results on a role in fear learning, this review presents the cerebellum as a regulator of integrated cardio-behavioral defensive states.
Small bacterial regulatory RNAs (sRNAs) have been implicated in the regulation of numerous metabolic pathways. In most of these studies, sRNA-dependent regulation of mRNAs or proteins of enzymes in metabolic pathways has been predicted to affect the metabolism of these bacteria. However, only in a very few cases has the role in metabolism been demonstrated. Here, we performed a combined transcriptome and metabolome analysis to define the regulon of the sibling sRNAs NgncR_162 and NgncR_163 (NgncR_162/163) and their impact on the metabolism of Neisseria gonorrhoeae. These sRNAs have been reported to control genes of the citric acid and methylcitric acid cycles by posttranscriptional negative regulation. By transcriptome analysis, we now expand the NgncR_162/163 regulon by several new members and provide evidence that the sibling sRNAs act as both negative and positive regulators of target gene expression. Newly identified NgncR_162/163 targets are mostly involved in transport processes, especially in the uptake of glycine, phenylalanine, and branched-chain amino acids. NgncR_162/163 also play key roles in the control of serine-glycine metabolism and, hence, probably affect biosyntheses of nucleotides, vitamins, and other amino acids via the supply of one-carbon (C\(_1\)) units. Indeed, these roles were confirmed by metabolomics and metabolic flux analysis, which revealed a bipartite metabolic network with glucose degradation for the supply of anabolic pathways and the usage of amino acids via the citric acid cycle for energy metabolism. Thus, by combined deep RNA sequencing (RNA-seq) and metabolomics, we significantly extended the regulon of NgncR_162/163 and demonstrated the role of NgncR_162/163 in the regulation of central metabolic pathways of the gonococcus.
Recently, we have described novel pyridyl indole esters and peptidomimetics as potent inhibitors of the severe acute respiratory syndrome coronavirus type 2 (SARS-CoV-2) main protease. Here, we analysed the impact of these compounds on viral replication. It has been shown that some antivirals against SARS-CoV-2 act in a cell line-specific way. Thus, the compounds were tested in Vero, Huh-7, and Calu-3 cells. We showed that the protease inhibitors at 30 µM suppress viral replication by up to 5 orders of magnitude in Huh-7 cells, while in Calu-3 cells, suppression by 2 orders of magnitude was achieved. Three pyridin-3-yl indole-carboxylates inhibited viral replication in all cell lines, indicating that they might repress viral replication in human tissue as well. Thus, we investigated three compounds in human precision-cut lung slices and observed donor-dependent antiviral activity in this patient-near system. Our results provide evidence that even direct-acting antivirals may act in a cell line-specific manner.
Introduction
Human cytomegalovirus (HCMV) causes significant morbidity and mortality in allogeneic stem cell transplant (alloSCT) recipients. Recently, antiviral letermovir prophylaxis during the first 100 days after alloSCT replaced PCR-guided preemptive therapy as the primary standard of care for HCMV reactivations. Here, we compared NK-cell and T-cell reconstitution in alloSCT recipients receiving preemptive therapy or letermovir prophylaxis in order to identify potential biomarkers predicting prolonged and symptomatic HCMV reactivation.
Methods
To that end, the NK-cell and T-cell repertoire of alloSCT recipients managed with preemptive therapy (n=32) or letermovir prophylaxis (n=24) was characterized by flow cytometry on days +30, +60, +90 and +120 after alloSCT. Additionally, background-corrected HCMV-specific T-helper (CD4+IFNγ+) and cytotoxic (CD8+IFNγ+CD107a+) T cells were quantified after pp65 stimulation.
Results
Compared to preemptive therapy, letermovir prophylaxis prevented HCMV reactivation and decreased HCMV peak viral loads until days +120 and +365. Letermovir prophylaxis resulted in decreased T-cell numbers but increased NK-cell numbers. Interestingly, despite the inhibition of HCMV, we found high numbers of “memory-like” (CD56dimFcεRIγ- and/or CD159c+) NK cells and an expansion of HCMV-specific CD4+ and CD8+ T cells in letermovir recipients. We further compared immunological readouts in patients on letermovir prophylaxis with non/short-term HCMV reactivation (NSTR) and prolonged/symptomatic HCMV reactivation (long-term HCMV reactivation, LTR). Median HCMV-specific CD4+ T-cell frequencies were significantly higher in NSTR patients (day +60, 0.35 % vs. 0.00 % CD4+IFNγ+/CD4+ cells, p=0.018) than in patients with LTR, whereas patients with LTR had significantly higher median regulatory T-cell (Treg) frequencies (day +90, 2.2 % vs. 6.2 % CD4+CD25+CD127dim/CD4+ cells, p=0.019). ROC analysis confirmed low HCMV specific CD4+ (AUC on day +60: 0.813, p=0.019) and high Treg frequencies (AUC on day +90: 0.847, p=0.021) as significant predictors of prolonged and symptomatic HCMV reactivation.
Discussion
Taken together, letermovir prophylaxis delays HCMV reactivation and alters NK- and T-cell reconstitution. High numbers of HCMV-specific CD4+ T cells and low numbers of Tregs seem to be pivotal to suppress post-alloSCT HCMV reactivation during letermovir prophylaxis. Administration of more advanced immunoassays that include Treg signature cytokines might contribute to the identification of patients at high-risk for long-term and symptomatic HCMV reactivation who might benefit from prolonged administration of letermovir.
Cardiovascular disease and the acute consequence of myocardial infarc- tion remain one of the most important causes of morbidity and mortality in all western societies. While much progress has been made in mitigating the acute, life-threatening ischemia caused by infarction, heart failure of the damaged my- ocardium remains prevalent. There is mounting evidence for the role of T cells in the healing process after myocardial infarction, but relevant autoantigens, which might trigger and regulate adaptive immune involvement have not been discov- ered in patients.
In this work, we discovered an autoantigenic epitope in the adrenergic receptor beta 1, which is highly expressed in the heart. This autoantigenic epitope causes a pro-inflammatory immune reaction in T cells isolated from pa- tients after myocardial infarction (MI) but not in control patients. This immune reaction was only observed in a subset of MI patients, which carry at least one allele of the HLA-DRB1*13 family. Interestingly, HLA-DRB1*13 was more com- monly expressed in patients in the MI group than in the control group.
Taken together, our data suggests antigen-specific priming of T cells in MI patients, which leads to a pro-inflammatory phenotype. The primed T cells react to a cardiac derived autoantigen ex vivo and are likely to exhibit a similar phenotype in vivo. This immune phenotype was only observed in a certain sub- set of patients sharing a common HLA-allele, which was more commonly ex- pressed in MI patients, suggesting a possible role as a risk factor for cardiovas- cular disease.
While our results are observational and do not have enough power to show strong clinical associations, our discoveries provide an essential tool to further our understanding of involvement of the immune system in cardiovascu- lar disease. We describe the first cardiac autoantigen in the clinical context of MI and provide an important basis for further translational and clinical research in cardiac autoimmunity.
Extracellular vesicles (EVs) are a heterogenous population of plasma membrane-surrounded particles that are released in the extracellular milieu by almost all types of living cells. EVs are key players in intercellular crosstalk, both locally and systemically, given that they deliver their cargoes (consisting of proteins, lipids, mRNAs, miRNAs, and DNA fragments) to target cells, crossing biological barriers. Those mechanisms further trigger a wide range of biological responses. Interestingly, EV phenotypes and cargoes and, therefore, their functions, stem from their specific parental cells. For these reasons, EVs have been proposed as promising candidates for EV-based, cell-free therapies. One of the new frontiers of cell-based immunotherapy for the fight against refractory neoplastic diseases is represented by genetically engineered chimeric antigen receptor T (CAR-T) lymphocytes, which in recent years have demonstrated their effectiveness by reaching commercialization and clinical application for some neoplastic diseases. CAR-T-derived EVs represent a recent promising development of CAR-T immunotherapy approaches. This crosscutting innovative strategy is designed to exploit the advantages of genetically engineered cell-based immunotherapy together with those of cell-free EVs, which in principle might be safer and more efficient in crossing biological and tumor-associated barriers. In this review, we underlined the potential of CAR-T-derived EVs as therapeutic agents in tumors.
Molecular imaging of rats is of great importance for basic and translational research. As a powerful tool in nuclear medicine, SPECT can be used to visualize specific functional processes in the body, such as myocardial perfusion or bone metabolism. Typical applications in laboratory animals are imaging diagnostics or the development of new tracers for clinical use. Innovations have enabled resolutions of up to a quarter of a millimeter with acceptable sensitivity. These advances have recently led to significantly more interest in SPECT both clinically and preclinically.
The objective of this thesis was to evaluate the performance of the new U-SPECT5/CT E-Class by MILabs with a dedicated ultra-high resolution multi-pinhole collimator for rats and its potential for in vivo imaging of rats. The unique features of the U-SPECT are the large stationary detectors and the new iterative reconstruction algorithm. In addition, compared to the conventional system, the "E-Class" uses only two detectors instead of three.
First, the sensitivity, maximum resolution, and uniformity were determined as performance parameters. Thereafter, CNRs for different activity levels comparable to those of typical in vivo activities were examined. Finally, two example protocols were carried out for imaging with 99mTc-MIBI and 99mTc-HMDP in healthy rats to evaluate the in vivo capabilities. For this purpose, CNR calculations and an image quality assessment were performed. The focus was on image quality as a function of scan time and post-reconstruction filter across a wide range of realistically achievable in vivo conditions.
Performance was reasonable compared to other systems in the literature, with a sensitivity of 567 cps/MBq, a maximum resolution of 1.20 mm, and a uniformity of 55.5%. At the lower activities, resolution in phantom studies decreased to ≥1.80 mm while maintaining good image quality. High-quality bone and myocardial perfusion SPECTs were obtained in rats with a resolution of ≥1.80 mm and ≥2.20 mm, respectively. Although limited sensitivity remains a weakness of SPECT, the U-SPECT5/CT E-Class with the UHR-RM collimator can achieve in vivo results of the highest standard despite the missing third detector. Currently, it is one of the best options for high-resolution radionuclide imaging in rats.
In Burkitt lymphoma (BL), a tumor of germinal center B cells, the pro-apoptotic properties of MYC are controlled by tonic B cell receptor (BCR) signals. Since BL cells do not exhibit constitutive NF-κB activity, we hypothesized that anti-apoptotic NFATc1 proteins provide a major transcriptional survival signal in BL. Here we show that post-transcriptional mechanisms are responsible for the calcineurin (CN) independent constitutive nuclear over-expression of NFATc1 in BL and Eµ-MYC – induced B cell lymphomas (BCL). Conditional inactivation of the Nfatc1 gene in B cells of Eµ-MYC mice leads to apoptosis of BCL cells in vivo and ex vivo. Inhibition of BCR/SYK/BTK/PI3K signals in BL cells results in cytosolic re-location of NFATc1 and apoptosis. Therefore, NFATc1 activity is an integrated part of tonic BCR signaling and an alternative target for therapeutic intervention in BL.
Purpose
Oncologists are at an increased risk of developing burnout, leading to negative consequences in patient care and in professional satisfaction and quality of life. This study was designed to investigate exhaustion and disengagement among German oncologists and assess the prevalence of burnout among oncologists within different professional settings. Furthermore, we wanted to examine possible relations between sociodemographic factors, the oncological setting, professional experience and different aspects of burnout.
Methods
In a cross-sectional study design, an Internet-based survey was conducted with 121 oncologists between April and July 2020 using the Oldenburg Burnout Inventory, which contains items on exhaustion, disengagement, and burnout. Furthermore, sociodemographic data of the participants were assessed. The participants were members of the Working Group Medical Oncology (Arbeitsgemeinschaft Internistische Onkologie) within the German Cancer Society.
Results
The survey showed a burnout prevalence of 43.8%, which correlated with age and professional experience; that is, the prevalence is particularly high among younger oncologists. Exhaustion is closely related to employment status; that is, it was significantly higher among employed oncologists. There were remarkably low levels of disengagement among oncologists, highlighting the own demand to fulfil job requirements despite imminent or actual overburdening in daily work.
Conclusion
More support is necessary to mitigate the professional stressors in the healthcare system. To ensure quality medical care, employees should be offered preventive mental health services early in their careers.