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Institute
- Theodor-Boveri-Institut für Biowissenschaften (131)
- Graduate School of Life Sciences (85)
- Medizinische Klinik und Poliklinik II (61)
- Institut für Anorganische Chemie (60)
- Medizinische Klinik und Poliklinik I (48)
- Neurologische Klinik und Poliklinik (45)
- Universität - Fakultätsübergreifend (45)
- Klinik und Poliklinik für Allgemein-, Viszeral-, Gefäß- und Kinderchirurgie (Chirurgische Klinik I) (38)
- Institut für Organische Chemie (37)
- Klinik und Poliklinik für Anästhesiologie (ab 2004) (37)
Sonstige beteiligte Institutionen
- DFG Forschungsgruppe 2757 / Lokale Selbstregelungen im Kontext schwacher Staatlichkeit in Antike und Moderne (LoSAM) (2)
- Siemens AG (2)
- Agricultural Center, BASF SE, 67117 Limburgerhof, Germany (1)
- Akademie der Wissenschaften und der Literatur, Mainz (1)
- Bayer AG, Research & Development, Pharmaceuticals, Investigational Toxicology (1)
- Betriebsärztlicher Dienst der Universität Würzburg (1)
- Center of Excellence for Science and Technology - Integration of Mediterranean region (STIM), Faculty of Science, University of Split, Poljička cesta 35, 2100 Split, Croatia (1)
- Comprehensive Cancer Center Mainfranken (1)
- Core Unit Systemmedizin (1)
- Departamento de Química, Facultad de Ciencias, Universidad Autónoma de Madrid, 28049 Madrid, Spain (1)
The predicted 80 open reading frames (ORFs) of herpes simplex virus 1 (HSV-1) have been intensively studied for decades. Here, we unravel the complete viral transcriptome and translatome during lytic infection with base-pair resolution by computational integration of multi-omics data. We identify a total of 201 transcripts and 284 ORFs including all known and 46 novel large ORFs. This includes a so far unknown ORF in the locus deleted in the FDA-approved oncolytic virus Imlygic. Multiple transcript isoforms expressed from individual gene loci explain translation of the vast majority of ORFs as well as N-terminal extensions (NTEs) and truncations. We show that NTEs with non-canonical start codons govern the subcellular protein localization and packaging of key viral regulators and structural proteins. We extend the current nomenclature to include all viral gene products and provide a genome browser that visualizes all the obtained data from whole genome to single-nucleotide resolution. Here, using computational integration of multi-omics data, the authors provide a detailed transcriptome and translatome of herpes simplex virus 1 (HSV-1), including previously unidentified ORFs and N-terminal extensions. The study also provides a HSV-1 genome browser and should be a valuable resource for further research.
Diese monozentrische, retrospektive Studie beschäftigt sich mit einem Patientenkollektiv, das bei abdominellen Wundheilungsstörungen nach allgemein- und viszeralchirurgischen Eingriffen, die im Zeitraum von Januar 2013 bis März 2016 am UKW durchgeführt wurden, einer Vakuumtherapie zugeführt wurde. Im Anschluss an die Vakuumtherapie erfolgte entweder eine Sekundärnaht oder die Wunde wurde der offenen Wundheilung zugeführt. Beim Vergleich der prä-, peri- und postoperativen Charakteristika dieser beiden Patientengruppen ergaben sich nahezu keine signifikanten Unterschiede. Lediglich in den präoperativ ermittelten ASA-Stadien schnitten die Patienten ohne Sekundärnaht signifikant schlechter ab als diejenigen mit Sekundärnaht. Dies weist auf deren schon von vorne herein reduzierten Allgemeinzustand hin, was eine spätere Sekundärnaht im Rahmen einer erneuten Operation erschwert. Die Datenanalyse des Follow-ups nach Entlassung lieferte letztlich signifikante Unterschiede zwischen sekundär verschlossenen und offen zugranulierenden Wunden zugunsten der Patienten, die eine Sekundärnaht erhielten mit mehr als "verheilt" dokumentierten Wunden. Somit bestätigte sich die ursprüngliche Befürchtung, dass im Milieu sekundär verschlossener Wunden eine erneute Wundheilungsstörung provoziert und die Wundheilung so im Gegensatz zu offen belassenen Wunden verhindert oder verzögert werden könnte, nicht. Bei der genaueren Betrachtung von Peritonitispatienten im Vergleich mit dem Gesamtkollektiv wurden hingegen bis auf den Einsatz von Antikoagulantien, die Anzahl der abdominellen Voroperationen und die Liegedauern auf Intensivstation keine signifikanten Unterschiede ermittelt, weshalb davon ausgegangen werden kann, dass der Vakuumtherapie unmittelbar vorangegangene Peritonitiden keinen merklichen Einfluss auf diese ausüben.
Es erfolgte eine elektrochemische Abscheidung von Bruschitschichten auf Titan in Gegenwart von Kristallisationsinhibitoren. Dabei wurden die Kristallisationsinhibitoren Zitronensäure, treta-Natriumdiphosphat-Decahydrat und Phytinsäure verwendet und die entstandenen Schichten mit denen ohne Inhibitorzugabe verglichen. Um das Ausmaß der Inhibierung zu verifizieren, wurde die Masse aller Schichten gemessen, welche für die Inhibition mit Zitronensäure und Phytinsäure abnahm und für Natriumdiphosphat zunahm. Die kristallographische Zusammensetzung der mit und ohne Inhibierung abgeschiedenen Schichten wurde mit Hilfe der Röntgendiffraktometrie bestimmt und zeigte, dass sich reine Bruschitschichten mit unterschiedlichem amorphem Anteil abschieden. Die daraus entstandenen Werte lieferten zugleich die Informationen über die einzelnen Kristallitgrößen innerhalb der Schichten. Über den Einfluss der Inhibitoren auf die Schichtmorphologie gaben rasterelektronenmikroskopische Aufnahmen weiteren Aufschluss. Die Inhibition verursachte teils mit Rissen durchzogene Schichten, deren Kristallformationen sich von Standardelektrolyt unterschieden. Ausgewählte Proben wurden unter verschiedenen Bedingungen desinfiziert bzw. sterilisiert und nachfolgend erneut gewogen und mittels Röntgendiffraktogrammetrie und Rasterelektronenmikroskopie analysiert. Nach der Desinfektion entstanden reine Bruschitschichten, die an Masse verloren aber trotzdem die typischen Kristallformationen zeigten. Die Sterilisation führte zur Umwandlung von Bruschit in Monetit und Hydroxylapatit. Des Weiteren wurde die biologische Reaktion der Schichten auf humane fötale Osteoblasten-Zelllinien zur Überprüfung der Zellverträglichkeit ermittelt. Die entstandenen Ergebnisse waren nicht verwertbar und enthielt sehr hohe Standardabweichungen.
Influenza-assoziierte Atemwegserkrankungen führen jedes Jahr zu zahlreichen Hospitalisierungen und Todesfällen. Der während der Pandemie 2009 zirkulierende Erreger Influenza A(H1N1)pdm09 führte zu zahlreichen, zum Teil schweren Komplikationen, insbesondere auch bei jüngeren Erwachsenen. In der vorliegenden Studie wurden Influenza-assoziierte Hospitalisierungen (IAH) hinsichtlich Krankheitsverlauf in den verschiedenen Altersgruppen sowie bei verschiedenen Erregern untersucht. Zudem erfolgte eine Analyse der direkten Krankheitskosten.
Einen besonders schweren Verlauf zeigten Erwachsene mit Grunderkrankung zwischen 18-60 Jahren, die überwiegend mit dem Erreger Influenza A(H1N1)pdm09 infiziert waren. Ebenso waren schwangeren Patientinnen mit IAH mit dem Erreger A(H1N1)pdm09 selten, aber schwer betroffen.
Bei Patienten von 18-60 Jahren mit dem Erreger Influenza A(H1N1)pdm09 entstanden die höchsten direkten Kosten im Vergleich zu den anderen Altersgruppen.
The limited proliferative capacity of neuroprogenitor cells (NPCs) within the periventricular germinal niches (PGNs) located caudal of the subventricular zone (SVZ) of the lateral ventricles together with their high proliferation capacity after isolation strongly implicates cell‐extrinsic humoral factors restricting NPC proliferation in the hypothalamic and midbrain PGNs. We comparatively examined the effects of norepinephrine (NE) as an endogenous candidate regulator of PGN neurogenesis in the SVZ as well as the periventricular hypothalamus and the periaqueductal midbrain. Histological and neurochemical analyses revealed that the pattern of NE innervation of the adult PGNs is inversely associated with their in vivo NPC proliferation capacity with low NE levels coupled to high NPC proliferation in the SVZ but high NE levels coupled to low NPC proliferation in hypothalamic and midbrain PGNs. Intraventricular infusion of NE decreased NPC proliferation and neurogenesis in the SVZ‐olfactory bulb system, while pharmacological NE inhibition increased NPC proliferation and early neurogenesis events in the caudal PGNs. Neurotoxic ablation of NE neurons using the Dsp4‐fluoxetine protocol confirmed its inhibitory effects on NPC proliferation. Contrarily, NE depletion largely impairs NPC proliferation within the hippocampus in the same animals. Our data indicate that norepinephrine has opposite effects on the two fundamental neurogenic niches of the adult brain with norepinephrine being a negative regulator of adult periventricular neurogenesis. This knowledge might ultimately lead to new therapeutic approaches to influence neurogenesis in hypothalamus‐related metabolic diseases or to stimulate endogenous regenerative potential in neurodegenerative processes such as Parkinson's disease.
Validation of text information as a general mechanism for detecting inconsistent or false information is an integral part of text comprehension. This study examined how the credibility of the information source affects validation processes. Two experiments investigated combined effects of source credibility and plausibility of information during validation with explicit (ratings) and implicit (reading times) measurements. Participants read short stories with a high-credible versus low-credible person that stated a consistent or inconsistent assertion with general world knowledge. Ratings of plausibility and ratings of source credibility were lower when a credible source stated a world-knowledge inconsistent assertion compared with a low-credible source. Reading times on target sentences and on spillover sentences were slower when a credible source stated an assertion inconsistent with world knowledge compared with a low-credible source, suggesting that source information modulated the validation of implausible information. These results show that source credibility modulates validation and suggest a bidirectional relationship of perceived plausibility and source credibility in the reading process.
Prostate-specific membrane antigen (PSMA)-targeted PET imaging for prostate cancer with \(^{68}\)Ga-labeled compounds has rapidly become adopted as part of routine clinical care in many parts of the world. However, recent years have witnessed the start of a shift from \(^{68}\)Ga- to \(^{18}\)F-labeled PSMA-targeted compounds. The latter imaging agents have several key advantages, which may lay the groundwork for an even more widespread adoption into the clinic. First, facilitated delivery from distant suppliers expands the availability of PET radiopharmaceuticals in smaller hospitals operating a PET center but lacking the patient volume to justify an onsite \(^{68}\)Ge/\(^{68}\)Ga generator. Thus, such an approach meets the increasing demand for PSMA-targeted PET imaging in areas with lower population density and may even lead to cost-savings compared to in-house production. Moreover, \(^{18}\)F-labeled radiotracers have a higher positron yield and lower positron energy, which in turn decreases image noise, improves contrast resolution, and maximizes the likelihood of detecting subtle lesions. In addition, the longer half-life of 110 min allows for improved delayed imaging protocols and flexibility in study design, which may further increase diagnostic accuracy. Moreover, such compounds can be distributed to sites which are not allowed to produce radiotracers on-site due to regulatory issues or to centers without access to a cyclotron. In light of these advantageous characteristics, \(^{18}\)F-labeled PSMA-targeted PET radiotracers may play an important role in both optimizing this transformative imaging modality and making it widely available. We have aimed to provide a concise overview of emerging \(^{18}\)F-labeled PSMA-targeted radiotracers undergoing active clinical development. Given the wide array of available radiotracers, comparative studies are needed to firmly establish the role of the available \(^{18}\)F-labeled compounds in the field of molecular PCa imaging, preferably in different clinical scenarios.
Exon-4 Mutations in KRAS Affect MEK/ERK and PI3K/AKT Signaling in Human Multiple Myeloma Cell Lines
(2020)
Approximately 20% of multiple myeloma (MM) cases harbor a point mutation in KRAS. However, there is still no final consent on whether KRAS-mutations are associated with disease outcome. Specifically, no data exist on whether KRAS-mutations have an impact on survival of MM patients at diagnosis in the era of novel agents. Direct blockade of KRAS for therapeutic purposes is mostly impossible, but recently a mutation-specific covalent inhibitor targeting KRAS\(^{p.G12C}\) entered into clinical trials. However, other KRAS hotspot-mutations exist in MM patients, including the less common exon-4 mutations. For the current study, the coding regions of KRAS were deep-sequenced in 80 newly diagnosed MM patients, uniformely treated with three cycles of bortezomib plus dexamethasone and cyclophosphamide (VCD)-induction, followed by high-dose chemotherapy and autologous stem cell transplantation. Moreover, the functional impact of KRAS\(^{p.G12A}\) and the exon-4 mutations p.A146T and p.A146V on different survival pathways was investigated. Specifically, KRAS\(^{WT}\), KRAS\(^{p.G12A}\), KRAS\(^{p.A146T}\), and KRAS\(^{p.A146V}\) were overexpressed in HEK293 cells and the KRAS\(^{WT}\) MM cell lines JJN3 and OPM2 using lentiviral transduction and the Sleeping Beauty vector system. Even though KRAS-mutations were not correlated with survival, all KRAS-mutants were found capable of potentially activating MEK/ERK- and sustaining PI3K/AKT-signaling in MM cells.
We investigated the influence of social status on behavior in a modified dictator game (DG). Since the DG contains an inherent dominance gradient, we examined the relationship between dictator decisions and recipient status, which was operationalized by three social identities and an artificial intelligence (AI). Additionally, we examined the predictive value of social dominance orientation (SDO) on the behavior of dictators toward the different social and non-social hierarchical recipients. A multilevel model analysis showed that recipients with the same status as the dictator benefited the most and the artificial intelligence the least. Furthermore, SDO, regardless of social status, predicted behavior toward recipients in such a way that higher dominance was associated with lower dictator offers. In summary, participants treated other persons of higher and lower status equally, those of equal status better and, above all, an algorithm worst. The large proportion of female participants and the limited variance of SDO should be taken into account with regard to the results of individual differences in SDO.
The present dissertation aims to shed light on different mechanisms of socio-emotional feedback in social decision-making situations. The objective is to evaluate emotional facial expressions as feedback stimuli, i.e., responses of interaction partners to certain social decisions. In addition to human faces, artificial emojis are also examined due to their relevance for modern digital communication. Previous research on the influence of emotional feedback suggests that a person's behavior can be effectively reinforced by rewarding stimuli. In the context of this dissertation, the differences in the feedback processing of human photographs and emojis, but also the evaluation of socially expected versus socially unexpected feedback were examined in detail in four studies. In addition to behavioral data, we used the electroencephalogram (EEG) in all studies to investigate neural correlates of social decision-making and emotional feedback.
As the central paradigm, all studies were based on a modified ultimatum game. The game is structured as follows: there is a so-called proposer who holds a specific amount of money (e.g., 10 cents) and offers the responder a certain amount (e.g., 3 cents). The responder then decides whether to accept or reject the offer. In the version of the ultimatum game presented here, different types of proposers are introduced. After the participants have accepted or rejected in the role of the responder, the different proposers react to the participant’s decision with specific emotional facial expressions. Different feedback patterns are used for the individual experiments conducted in the course of this dissertation.
In the first study, we investigated the influence of emotional feedback on decision-making in the modified version of the ultimatum game. We were able to show that a proposer who responds to the acceptance of an offer with a smiling face achieves more accepted offers overall than a control proposer who responds to both accepted and rejected offers with a neutral facial expression. Consequently, the smile served as a positive reinforcement. Similarly, a sad expression in response to a rejected offer also resulted in higher acceptance rates as compared to the control identity, which could be considered an expression of compassion for that proposer. On a neuronal level, we could show that there are differences between simply looking at negative emotional stimuli (i.e., sad and angry faces) and their appearance as feedback stimuli after rejected offers in the modified ultimatum game. The so-called feedback-related negativity was reduced (i.e., more positive) when negative emotions appeared as feedback from the proposers. We argued that these findings might show that the participants wanted to punish the proposers by rejecting an offer for its unfairness and therefore the negative feedback met their expectations. The altered processing of negative emotional facial expressions in the ultimatum game could therefore indicate that the punishment is interpreted as successful. This includes the expectation that the interaction partner will change his behavior in the future and eventually make fairer offers.
In the second study we wanted to show that smiling and sad emojis as feedback stimuli in the modified ultimatum game can also lead to increased acceptance rates. Contrary to our assumptions, this effect could not be observed. At the neural level as well, the findings did not correspond to our assumptions and differed strongly from those of the first study. One finding, however, was that the neural P3 component showed how the use of emojis as feedback stimuli particularly characterizes certain types of proposers. This is supported by the fact that the P3 is increased for the proposer who rewards an acceptance with a smile as well as for the proposer who reacts to rejection with a sad emoji compared to the neutral control proposer.
The third study examined the discrepancy between the findings of the first and second study. Accordingly, both humans and emojis representing the different proposers were presented in the ultimatum game. In addition, emojis were selected that showed a higher similarity to known emojis from common messenger services compared to the second study. We were able to replicate that the proposers in the ultimatum game, who reward an acceptance of the offer with a smile, led to an increased acceptance rate compared to the neutral control proposers. This difference is independent of whether the proposers are represented by emojis or human faces. With regard to the neural correlates, we were able to demonstrate that emojis and human faces differ strongly in their neural processing. Emojis showed stronger activation than human faces in the face-processing N170 component, the feedback-related negativity and the P3 component. We concluded that the results of the N170 and feedback-related negativity could indicate a signal for missing social information of emojis compared to faces. The increased P3 amplitude for emojis might imply that emojis appear unexpectedly as reward stimuli in a social decision task compared to human faces.
The last study of this project dealt with socially unexpected feedback. In comparison to the first three studies, new proposer identities were implemented. In particular, the focus was on a proposer who reacted to the rejection of an offer unexpectedly with a smile and to the acceptance with a neutral facial expression. According to the results, participants approach this unexpected smile through increased rejection, although it is accompanied by financial loss. In addition, as reported in studies one and three, we were able to show that proposers who respond to the acceptance of an offer with a smiling face and thus meet the expectations of the participants have higher offer acceptance rates than the control proposer. At the neuronal level, especially the feedback from the socially unexpected proposer led to an increased P3 amplitude, which indicates that smiling after rejection is attributed a special subjective importance.
The experiments provide new insights into the social influence through emotional feedback and the processing of relevant social cues. Due to the conceptual similarity of the studies, it was possible to differentiate between stable findings and potentially stimulus-dependent deviations, thus creating a well-founded contribution to the current research. Therefore, the novel paradigm presented here, and the knowledge gained from it could also play an important role in the future for clinical questions dealing with limited social competencies.
Objective
As native cartilage consists of different phenotypical zones, this study aims to fabricate different types of neocartilage constructs from collagen hydrogels and human mesenchymal stromal cells (MSCs) genetically modified to express different chondrogenic factors.
Design
Human MSCs derived from bone-marrow of osteoarthritis (OA) hips were genetically modified using adenoviral vectors encoding sex-determining region Y-type high-mobility-group-box (SOX)9,transforming growth factor beta (TGFB) 1or bone morphogenetic protein (BMP) 2cDNA, placed in type I collagen hydrogels and maintained in serum-free chondrogenic media for three weeks. Control constructs contained unmodified MSCs or MSCs expressing GFP. The respective constructs were analyzed histologically, immunohistochemically, biochemically, and by qRT-PCR for chondrogenesis and hypertrophy.
Results
Chondrogenesis in MSCs was consistently and strongly induced in collagen I hydrogels by the transgenesSOX9,TGFB1andBMP2as evidenced by positive staining for proteoglycans, chondroitin-4-sulfate (CS4) and collagen (COL) type II, increased levels of glycosaminoglycan (GAG) synthesis, and expression of mRNAs associated with chondrogenesis. The control groups were entirely non-chondrogenic. The levels of hypertrophy, as judged by expression of alkaline phosphatase (ALP) and COL X on both the protein and mRNA levels revealed different stages of hypertrophy within the chondrogenic groups (BMP2>TGFB1>SOX9).
Conclusions
Different types of neocartilage with varying levels of hypertrophy could be generated from human MSCs in collagen hydrogels by transfer of genes encoding the chondrogenic factorsSOX9,TGFB1andBMP2. This technology may be harnessed for regeneration of specific zones of native cartilage upon damage.
Background
Surgical reattachment of the tendon is still the gold standard for ruptures of the distal biceps brachii tendon. Several fixation techniques have been described in the literature, with suture anchors being one of the most common fixation techniques. Currently, there is no data available on how many anchors are required for a safe and stable refixation. In this case report clinical data of a patient with non-simultaneous bilateral distal biceps tendon ruptures treated with a different number of suture anchors for each side (one vs. two) are demonstrated.
Case presentation
A 47-year-old factory worker suffered a rupture of the distal biceps tendon on both arms following two different occasions. The left side was fixed using a single suture anchor, while refixation on the right side was performed with two anchors. The patient was prospectively followed for one year. Functional outcome was assessed using the Andrews Carson Score (ACS), the Oxford Elbow Score (OES), and the Disabilities of Arm, Shoulder and Hand (DASH) Score after six, twelve, 24 and 48 weeks. Furthermore, an isokinetic strength measurement for flexion strength was performed after 24 and 48 weeks. After 48 weeks the patient presented with excellent functional outcome scores and no follow-up complications. During the follow-up period, no differences in the functional scores nor in the isokinetic flexion strength measurement could be detected. Furthermore, no radiological complications (like heterotopic ossifications) could be detected in the postoperative radiographs after one year.
Conclusions
Anatomic reattachment of the distal biceps tendon is a successful operative treatment option for distal biceps tendon ruptures. Suture anchor fixation remains one of the most common techniques, as it allows fast surgery and provides good results with respect to range of motion (ROM) and functional scoring according to the current literature. However, the number of anchors required for a stable fixation remains unclear. As indicated by our presented case, we hypothesize, that there are no significant differences between a one-point or a two-point fixation. In the presented case report, no intraindividual differences between the usage of one versus two suture anchors were evident in the short-term follow-up.
Background
Mesenchymal stem cell (MSC) based-treatments of cartilage injury are promising but impaired by high levels of hypertrophy after chondrogenic induction with several bone morphogenetic protein superfamily members (BMPs). As an alternative, this study investigates the chondrogenic induction of MSCs via adenoviral gene-delivery of the transcription factor SOX9 alone or in combination with other inducers, and comparatively explores the levels of hypertrophy and end stage differentiation in a pellet culture system in vitro.
Methods
First generation adenoviral vectors encoding SOX9, TGFB1 or IGF1 were used alone or in combination to transduce human bone marrow-derived MSCs at 5 x 10\(^2\) infectious particles/cell. Thereafter cells were placed in aggregates and maintained for three weeks in chondrogenic medium. Transgene expression was determined at the protein level (ELISA/Western blot), and aggregates were analysed histologically, immunohistochemically, biochemically and by RT-PCR for chondrogenesis and hypertrophy.
Results
SOX9 cDNA was superior to that encoding TGFB1, the typical gold standard, as an inducer of chondrogenesis in primary MSCs as evidenced by improved lacuna formation, proteoglycan and collagen type II staining, increased levels of GAG synthesis, and expression of mRNAs associated with chondrogenesis. Moreover, SOX9 modified aggregates showed a markedly lower tendency to progress towards hypertrophy, as judged by expression of the hypertrophy markers alkaline phosphatase, and collagen type X at the mRNA and protein levels.
Conclusion
Adenoviral SOX9 gene transfer induces chondrogenic differentiation of human primary MSCs in pellet culture more effectively than TGFB1 gene transfer with lower levels of chondrocyte hypertrophy after 3 weeks of in vitro culture. Such technology might enable the formation of more stable hyaline cartilage repair tissues in vivo.
Delayed natural killer (NK) cell reconstitution after allogeneic stem cell transplantation (alloSCT) is associated with a higher risk of developing invasive aspergillosis. The interaction of NK cells with the human pathogen Aspergillus (A.) fumigatus is mediated by the fungal recognition receptor CD56, which is relocated to the fungal interface after contact. Blocking of CD56 signaling inhibits the fungal mediated chemokine secretion of MIP-1α, MIP-1β, and RANTES and reduces cell activation, indicating a functional role of CD56 in fungal recognition. We collected peripheral blood from recipients of an allograft at defined time points after alloSCT (day 60, 90, 120, 180). NK cells were isolated, directly challenged with live A. fumigatus germ tubes, and cell function was analyzed and compared to healthy age and gender-matched individuals. After alloSCT, NK cells displayed a higher percentage of CD56\(^{bright}\)CD16\(^{dim}\) cells throughout the time of blood collection. However, CD56 binding and relocalization to the fungal contact side were decreased. We were able to correlate this deficiency to the administration of corticosteroid therapy that further negatively influenced the secretion of MIP-1α, MIP-1β, and RANTES. As a consequence, the treatment of healthy NK cells ex vivo with corticosteroids abrogated chemokine secretion measured by multiplex immunoassay. Furthermore, we analyzed NK cells regarding their actin cytoskeleton by Structured Illumination Microscopy (SIM) and flow cytometry and demonstrate an actin dysfunction of NK cells shown by reduced F-actin content after fungal co-cultivation early after alloSCT. This dysfunction remains until 180 days post-alloSCT, concluding that further actin-dependent cellular processes may be negatively influenced after alloSCT. To investigate the molecular pathomechansism, we compared CD56 receptor mobility on the plasma membrane of healthy and alloSCT primary NK cells by single-molecule tracking. The results were very robust and reproducible between tested conditions which point to a different molecular mechanism and emphasize the importance of proper CD56 mobility.
Chemie - all inclusive
(2020)
Dieses Kompendium von Methodenwerkzeugen für die Entwicklung inklusiv angelegter naturwissenschaftlicher Experimentier-Stationen ist hilfreich zur pädagogischen Gestaltung von inklusiven experimentellen Settings, um einen Zugewinn an Fachlichkeit für alle Schülerinnen und Schüler zu sichern. Es werden Planungsschritte und Methodenwerkzeuge vorgestellt, damit der Zugang zu Experimenten für alle Kinder auf allen Ebenen geschaffen werden kann.
Als die häufigste tödliche Tumorerkrankung weltweit ist das Lungenkarzinom mit einer sehr schlechten Prognose verbunden. Eine Behandlungsoption für Lungenadenokarzinome, die eine aktivierende EGFR-Mutation aufweisen, ist der orale EGFR-TKI Gefitinib (Iressa®, ZD1839). Die Resistenzentwicklung von Tumoren gegen diese Therapie stellt ein großes klinisches Problem dar.
Das Ziel dieser Arbeit war es, die Dosis-Wirkungs-Beziehung von Gefitinib, sowie die Entwicklung von Resistenzen in einem etablierten humanen 3D Lungentumormodell zu untersuchen und dieses Testsystem für eben diese Fragestellungen zu validieren.
Vorliegende Arbeit bestätigt, dass pharmakologische Untersuchungen in Zellkulturen häufig zu einer Überschätzung des Behandlungserfolges führen. Das verwendete Modell entspricht mehr den in vivo Bedingungen. In dieser Arbeit wurden zwei ATP-Zellvitalitätsassays für die statischen 3D Lungentumormodelle etabliert und erfolgreich angewendet. Dabei zeigte sich eine konzentrationsabhängige Wirkung von Gefitinib auf das Wachstum, die Proliferation, die Apoptose, die Markerexpression sowie die Signalwegsaktivierungen. Im statischen 3D Lungentumormodell lag der IC50-Wert zwischen 0,05-0,1 µM Gefitinib welches den Werten aus klinischen Beobachtungen entspricht. Auch der in der Klinik bereits nach wenigen Stunden eintretende zeitliche Effekt von Gefitinib konnte in unserem Modell bestätigt werden. Eine dynamische Kultivierung der Lungentumorzellen, mit von Scherkräften verursachtem schnellerem Zellwachstum, führte zu einer weiteren Annährung an die klinischen Gegebenheiten. Das Netzwerk der Gefitinib-Wirkung auf die EGFR-Signalkaskade wurde in unserem Modell charakterisiert.
Die Betrachtung einer resistenten Zell-Subpopulation zeigte einen Resistenzmechanismus über eine Epitheliale-Mesenchymale-Transition. Zusätzlich wurde versucht, eine neue medikamenten-resistente Zell-Subpopulation zu generieren.
Das beschriebene 3D Lungentumormodell ermöglicht richtungsweisende Untersuchungen zu Dosis-Wirkungs-Beziehung von Gefitinib. Ansätze für eine weitere Optimierung des Modells wurden herausgearbeitet.
Fatigue als ein „überwältigendes Gefühl von Müdigkeit, Energielosigkeit und Erschöpfung” stellt bei Patienten mit MS ein häufig auftretendes und oft im Alltag beeinträchtigendes Symptom dar, das sowohl mit körperlichen als auch mit kognitiven Erschöpfungssymptomen einhergeht. Die objektive Erfassung des Schweregrades der Fatigue beim einzelnen Patienten stellt ein Problem dar, da bisher keine objektiven Messverfahren zur Erfassung der Fatigue existieren. Im klinischen Alltag kommen meist Fragebögen zum Einsatz, die das Ausmaß der subjektiven Beeinträchtigung durch Fatigue im Alltag quantifizieren sollen.
Ziel dieser Arbeit war es, zu untersuchen, inwieweit bestimmte im klinischen Alltag erhobene Parameter Rückschlüsse auf die subjektive Fatigue bei Patienten mit MS erlauben, auch im Hinblick darauf, ob sich einzelne Parameter besonders zur Einschätzung der körperlichen bzw. kognitiven Fatigue eignen. Zudem sollte untersucht werden, ob die untersuchten klinischen Parameter bei bestimmten Patientengruppen besser als bei anderen Rückschlüsse auf die subjektive Fatigue erlauben. Erfasst wurde die subjektive Fatigue durch das Würzburger Erschöpfungsinventar bei Multipler Sklerose (WEIMuS), einer Serie von Fragen, die zwischen körperlicher und kognitiver Fatigue unterscheiden.
Dazu wurden Korrelationsanalysen zwischen der WEIMuS-Gesamtskala bzw. deren Subskalen für körperliche und kognitive Fatigue und EDSS-Wert, MSFC Z-Score einschließlich dessen Subscores und der Zeit des 50-Meter-Gehversuchs durchgeführt. Bezüglich der körperlichen Fatigue ergaben sich zwischen der WEIMuS-Subskala für körperliche Fatigue und dem EDSS sowie der Zeit des 50-Meter-Gehversuchs im Vergleich die stärksten, absolut gesehen als mittelstark zu wertende, Korrelationen. Bezüglich der kognitiven Fatigue ergab sich die stärkste Korrelation zwischen der WEIMuS-Subskala für kognitive Fatigue und dem PASAT3, die allerdings trotzdem als gering zu werten ist. Mit EDSS und 50-Meter-Gehversuch scheinen also zwei objektive klinische Parameter zu existieren, die in einem gewissen Maß auf die subjektive Fatigue rückschließen lassen. Ziel weiterer Untersuchungen wird es sein müssen, einen geeigneten klinischen Parameter zu finden, der bessere Rückschlüsse auf die subjektive kognitive Fatigue erlaubt als der PASAT3.
Zwischen der WEIMuS-Gesamtskala bzw. deren Subskalen für körperliche und kognitive Fatigue und Alter, Geschlecht und Erkrankungsdauer fanden sich bestenfalls geringe Korrelationen, weshalb diese Parameter ungeeignet erscheinen, Aussagen über die subjektive Fatigue zu machen.
Durch die Einteilung der Patienten nach Alter und Geschlecht konnte untersucht werden, inwieweit diese Parameter Einfluss auf die untersuchten Zusammenhänge zwischen klinischen Parametern und subjektiver Fatigue haben. Die Korrelationen zwischen den WEIMuS-Subskalen für körperliche und kognitive Fatigue mit den untersuchten klinischen Parametern waren für junge Patienten überwiegend stärker als für ältere Patienten, insbesondere ältere Männer. Somit scheinen die untersuchten klinischen Parameter bei jüngeren Patienten besser geeignet, Aussagen über die subjektive Fatigue zu machen als bei älteren.
Insgesamt ist festzuhalten, dass EDSS und 50-Meter-Gehversuch insbesondere bei jungen Patienten zu einer besseren objektiven Beurteilbarkeit vor allem der körperlichen Fatigue im klinischen Alltag beitragen können.
Background
To increase the image quality of end-expiratory and end-inspiratory phases of retrospective respiratory self-gated 4D MRI data sets using non-rigid image registration for improved target delineation of moving tumors.
Methods
End-expiratory and end-inspiratory phases of volunteer and patient 4D MRI data sets are used as targets for non-rigid image registration of all other phases using two different registration schemes: In the first, all phases are registered directly (dir-Reg) while next neighbors are successively registered until the target is reached in the second (nn-Reg). Resulting data sets are quantitatively compared using diaphragm and tumor sharpness and the coefficient of variation of regions of interest in the lung, liver, and heart. Qualitative assessment of the patient data regarding noise level, tumor delineation, and overall image quality was performed by blinded reading based on a 4 point Likert scale.
Results
The median coefficient of variation was lower for both registration schemes compared to the target. Median dir-Reg coefficient of variation of all ROIs was 5.6% lower for expiration and 7.0% lower for inspiration compared with nn-Reg. Statistical significant differences between the two schemes were found in all comparisons. Median sharpness in inspiration is lower compared to expiration sharpness in all cases. Registered data sets were rated better compared to the targets in all categories. Over all categories, mean expiration scores were 2.92 +/- 0.18 for the target, 3.19 +/- 0.22 for nn-Reg and 3.56 +/- 0.14 for dir-Reg and mean inspiration scores 2.25 +/- 0.12 for the target, 2.72 +/- 215 0.04 for nn-Reg and 3.78 +/- 0.04 for dir-Reg.
Conclusions
In this work, end-expiratory and inspiratory phases of a 4D MRI data sets are used as targets for non-rigid image registration of all other phases. It is qualitatively and quantitatively shown that image quality of the targets can be significantly enhanced leading to improved target delineation of moving tumors.
Homo- and heterochiral aggregation during crystallization of organic molecules has significance both for fundamental questions related to the origin of life as well as for the separation of homochiral compounds from their racemates in industrial processes. Herein, we analyse these phenomena at the lowest level of hierarchy - that is the self-assembly of a racemic mixture of (R,R)- and (S,S)-PBI into 1D supramolecular polymers. By a combination of UV/vis and NMR spectroscopy as well as atomic force microscopy, we demonstrate that homochiral aggregation of the racemic mixture leads to the formation of two types of supramolecular conglomerates under kinetic control, while under thermodynamic control heterochiral aggregation is preferred, affording a racemic supramolecular polymer. FT-IR spectroscopy and quantum-chemical calculations reveal unique packing arrangements and hydrogen-bonding patterns within these supramolecular polymers. Time-, concentration- and temperature-dependent UV/vis experiments provide further insights into the kinetic and thermodynamic control of the conglomerate and racemic supramolecular polymer formation. Homo- and heterochiral aggregation is a process of interest to prebiotic and chiral separation chemistry. Here, the authors analyze the self-assembly of a racemic mixture into 1D supramolecular polymers and find homochiral aggregation into conglomerates under kinetic control, while under thermodynamic control a racemic polymer is formed.
Purpose:
The model used to calculate dose distributions in a radiotherapy treatment plan relies on the data entered during beam commissioning. The quality of these data heavily depends on the detector choice made, especially in small fields and in the buildup region. Therefore, it is necessary to identify suitable detectors for measurements in the buildup region of small fields. To aid the understanding of a detector's limitations, several factors that influence the detector signal are to be analyzed, for example, the volume effect due to the detector size, the response to electron contamination, the signal dependence on the polarity used, and the effective point of measurement chosen.
Methods:
We tested the suitability of different small field detectors for measurements of depth dose curves with a special focus on the surface‐near area of dose buildup for fields sized between 10 × 10 and 0.6 × 0.6 cm\(^{2}\). Depth dose curves were measured with 14 different detectors including plane‐parallel chambers, thimble chambers of different types and sizes, shielded and unshielded diodes as well as a diamond detector. Those curves were compared with depth dose curves acquired on Gafchromic film. Additionally, the magnitude of geometric volume corrections was estimated from film profiles in different depths. Furthermore, a lead foil was inserted into the beam to reduce contaminating electrons and to study the resulting changes of the detector response. The role of the effective point of measurement was investigated by quantifying the changes occurring when shifting depth dose curves. Last, measurements for the small ionization chambers taken at opposing biasing voltages were compared to study polarity effects.
Results:
Depth‐dependent correction factors for relative depth dose curves with different detectors were derived. Film, the Farmer chamber FC23, a 0.13 cm\(^{3}\) scanning chamber CC13 and a plane‐parallel chamber PPC05 agree very well in fields sized 4 × 4 and 10 × 10 cm\(^{2}\). For most detectors and in smaller fields, depth dose curves differ from the film. In general, shielded diodes require larger corrections than unshielded diodes. Neither the geometric volume effect nor the electron contamination can account for the detector differences. The biggest uncertainty arises from the positioning of a detector with respect to the water surface and from the choice of the detector's effective point of measurement. Depth dose curves acquired with small ionization chambers differ by over 15% in the buildup region depending on sign of the biasing voltage used.
Conclusions:
A scanning chamber or a PPC40 chamber is suitable for fields larger than 4 × 4 cm\(^{2}\). Below that field size, the microDiamond or small ionization chambers perform best requiring the smallest corrections at depth as well as in the buildup region. Diode response changes considerably between the different types of detectors. The position of the effective point of measurement has a huge effect on the resulting curves, therefore detector specific rather than general shifts of half the inner radius of cylindrical ionization chambers for the effective point of measurement should be used. For small ionization chambers, averaging between both polarities is necessary for data obtained near the surface.
Die Resistenz von Tumorzellen gegenüber Apoptose stellt einen zentralen Baustein in der Pathogenese von Tumorerkrankungen dar. cFLIP inhibiert rezeptornah die Todesrezeptor-vermittelte Apoptose und spielt somit eine bedeutende Rolle als Regulator der Apoptose. Eine verstärkte Expression von cFLIP kann folglich hinweisend auf eine Fehlregulation der Apoptose bei der Entstehung und Progression von Tumoren sein. In der vorliegenden Arbeit wurde die Expression von cFLIP in kutanen epithelialen und melanozytären Tumoren mit formalinfixierten und paraffinierten Gewebeproben untersucht. Bei der zunächst durchgeführten Charakterisierung der käuflich erhältlichen monoklonalen cFLIP-Antikörper mittels cFLIP-überexprimierenden HaCaT-Keratinozyten wurde überraschenderweise die fehlende Spezifität eines Antikörpers (KlonEPR8438(2)) nachgewiesen, was zur Folge hatte, dass der Hersteller die Produktion nach Mitteilung der Befunde eingestellt hat. Daher wurden die weiteren Untersuchungen unter Verwendung des Antikörper-Klons G11, der sowohl im Western Blot als auch immunhistochemisch die beiden cFLIP-Splicevarianten cFLIPL und cFLIPS spezifisch nachweist, durchgeführt. Hierbei konnte gezeigt werden, dass cFLIP in epithelialen Hauttumoren in erheblichem Maß exprimiert wird. In jeweils 40% der untersuchten aktinischen Keratosen und Morbi Bowen konnte cFLIP nachgewiesen werden. Im Vergleich dazu zeigte sich in den fortgeschrittenen Formen epithelialer Hauttumoren eine deutlich höhere Expressionsrate. Eine Expression wiesen zudem 100% der untersuchten Keratoakanthome und 95% der Plattenepithelkarzinome (mit überwiegend gutem Differenzierungsgrad) auf. Dementsprechend war es nicht verwunderlich, dass alle untersuchten Metastasen von Plattenepithelkarzinomen cFLIP überexprimierten. Die Analyse melanozytärer Läsionen ergab, dass cFLIP in melanozytären Nävi wie auch superfiziell spreitenden Melanomen, Lentigo-maligna-Melanomen und akral lentiginösen Melanomen nur in einer sehr geringen Anzahl der untersuchten Präparate überexprimiert wurde. Erstaunlicherweise konnte jedoch in 65% der nodulären Melanome sowie in 60% der Melanommetastasen cFLIP nachgewiesen werden. Bezüglich der Expression von cFLIP im Primärtumor sowie der Metastase desselben Patienten konnte kein eindeutiger Trend festgestellt werden. Die Ergebnisse dieser Arbeit deuten darauf hin, dass die frühe Hemmung des extrinsischen Apoptoseweges durch das antiapoptotische Protein cFLIP an der Entstehung, dem Wachstum und möglicherweise der Metastasierung epithelialer Hauttumore beteiligt sein dürfte. Die auffallend hohe Expressionsrate im nodulären Melanom sowie den untersuchten Melanommetastasen könnte einen zukünftigen therapeutischen Angriffspunkt darstellen.
The introduction of new therapeutic agents has revolutionized the treatment of metastatic melanoma. The approval of adjuvant anti‐programmed death‐1 monotherapy with nivolumab or pembrolizumab, and dabrafenib plus trametinib has recently set a new landmark in the treatment of stage III melanoma. Now, clinical trials have shown that immune checkpoint blockade can be performed in a neoadjuvant setting, an approach established as a standard therapeutic approach for other tumour entities such as breast cancer. Recent studies suggest that a pathological response achieved by neoadjuvant immunotherapy is associated with long‐term tumour control and that short neoadjuvant application of checkpoint inhibitors may be superior to adjuvant therapy. Most recently, neoadjuvant ipilimumab plus nivolumab in stage III melanoma was reported. With two courses of dose‐optimized ipilimumab (1 mg kg−1) combined with nivolumab (3 mg kg−1), pathological responses were observed in 77% of patients, while only 20% of patients experienced grade 3 or 4 adverse events. However, the neoadjuvant trials employing combined immune checkpoint blockade conducted so far have excluded patients with in transit metastases, a common finding in stage III melanoma. Here we report four patients with in transit metastases or an advanced primary tumour who have been treated with neoadjuvant ipilimumab plus nivolumab according to the OpACIN‐neo trial scheme (arm B). All patients achieved radiological disease control and a pathological response. None of the patients has relapsed so far.
Eine fundierte Ausbildung ist in der interventionellen Kardiologie essentiell, um die teilweise komplexen Prozeduren erfolgreich und sicher durchführen zu können. Bei der perkutanen Koronarintervention (PCI) können u.a. Fehler beim Handling des Führungsdrahtes auftreten. So kann es einerseits zum Drahtverlust, andererseits zur distalen Koronargefäßperforation kommen. Daher ist es sinnvoll, die Technik des Katheterwechsels ohne inadäquate Drahtbewegung vor der ersten Intervention im Herzkatheterlabor am Modell zu trainieren. Für diesen Zweck wurde der DACH-BOSS-Simulator entwickelt, an dem der Katheterwechsel trainiert werden kann.
Die Validität des Modells wurde im Rahmen einer Studie bei 10 Medizinstudenten (S) sowie 10 angehenden interventionellen Kardiologen (F) untersucht. Jeder Teilnehmer führte eine Trainingsreihe bestehend aus 25 Prozeduren durch. Um den Trainingseffekt zu ermitteln, wurden die mittleren Punktzahlen der ersten 3 und der letzten 3 Prozeduren jedes Probanden in der Studenten- und Fortgeschrittenengruppe verglichen. Zur Bestimmung der Konstruktvalidität führte eine dritte Gruppe von 5 Experten (E, > 1000 PCIs) jeweils 3 Prozeduren durch. Ausmaß der Drahtbewegung und benötigte Zeit wurden mit Punkten bewertet und als Skills score dargestellt.
Bei den ersten 3 Prozeduren erzielten die Experten signifikant höhere Werte als die Studenten oder die Fortgeschrittenengruppe (E: 12,9±1,0; S: 7,1±2,6, p = 0,001;
F: 8,3±2,0; p = 0,001; Mann-Whitney-U). Anfänger und Fortgeschrittene durchliefen während der 25 Trainingsprozeduren eine Lernkurve; im Mittel verbesserte sich die Studentengruppe von 7,1±2,6 auf 12,2±2 (p=0,007, Wilcoxon) und die Fortgeschrittenengruppe von 8,3±2,0 auf 13,2±1,0 (p = 0,005, Wilcoxon).
Der DACH-BOSS-Simulator stellt somit ein valides Modell zum Training des Katheterwechsels ohne inadäquate Drahtbewegung dar. Angehende interventionelle Kardiologen können diesen wichtigen Schritt der Prozedur am Modell trainieren und erlernen. Ob die am Simulator erworbenen Fähigkeiten auf die klinische Prozedur übertragbar sind, muss in weiteren Studien untersucht werden.
Metabolic Alterations Caused by Defective Cardiolipin Remodeling in Inherited Cardiomyopathies
(2020)
The heart is the most energy-consuming organ in the human body. In heart failure, the homeostasis of energy supply and demand is endangered by an increase in cardiomyocyte workload, or by an insufficiency in energy-providing processes. Energy metabolism is directly associated with mitochondrial redox homeostasis. The production of toxic reactive oxygen species (ROS) may overwhelm mitochondrial and cellular ROS defense mechanisms in case of heart failure. Mitochondria are essential cell organelles and provide 95% of the required energy in the heart. Metabolic remodeling, changes in mitochondrial structure or function, and alterations in mitochondrial calcium signaling diminish mitochondrial energy provision in many forms of cardiomyopathy. The mitochondrial respiratory chain creates a proton gradient across the inner mitochondrial membrane, which couples respiration with oxidative phosphorylation and the preservation of energy in the chemical bonds of ATP. Akin to other mitochondrial enzymes, the respiratory chain is integrated into the inner mitochondrial membrane. The tight association with the mitochondrial phospholipid cardiolipin (CL) ensures its structural integrity and coordinates enzymatic activity. This review focuses on how changes in mitochondrial CL may be associated with heart failure. Dysfunctional CL has been found in diabetic cardiomyopathy, ischemia reperfusion injury and the aging heart. Barth syndrome (BTHS) is caused by an inherited defect in the biosynthesis of cardiolipin. Moreover, a dysfunctional CL pool causes other types of rare inherited cardiomyopathies, such as Sengers syndrome and Dilated Cardiomyopathy with Ataxia (DCMA). Here we review the impact of cardiolipin deficiency on mitochondrial functions in cellular and animal models. We describe the molecular mechanisms concerning mitochondrial dysfunction as an incitement of cardiomyopathy and discuss potential therapeutic strategies.
Long-term treatment effect studies in large female Fabry patient groups are challenging to design because of phenotype heterogeneity and lack of appropriate comparison groups, and have not been reported. We compared long-term cardiomyopathy and kidney function outcomes after agalsidase beta treatment with preceding treatment-naive outcomes.
Methods and results Self-controlled pretreatment and post-treatment comparison (piecewise mixed linear modelling) included Fabry female patients ≥18 years at treatment initiation who received agalsidase beta (0.9–1.1 mg/kg every other week) for ≥2 years, with ≥2 pretreatment and ≥2 post-treatment outcome measurements during 10-year follow-up. Left ventricular posterior wall thickness (LVPWT)/interventricular septal thickness (IVST) and estimated glomerular filtration rate (eGFR, Chronic Kidney Disease Epidemiology Collaboration creatinine equation) analyses included 42 and 86 patients, respectively, aged 50.0 and 46.3 years at treatment initiation, respectively. LVPWT and IVST increased pretreatment (follow-up 3.5 years) but stabilized during 3.6 years of treatment (LVPWT: n = 38, slope difference [95% confidence interval (CI)] = - 0.41 [ - 0.68, - 0.15] mm/year, P\(_{pre–post difference}\)<0.01; IVST: n = 38, slope difference =-0.32 [-0.67, 0.02] mm/year, P\(_{pre–post difference}\) = 0.07). These findings were not modified by renal involvement or antiproteinuric agent use. Compared with the treatment-naive period (follow-up 3.6 years), eGFR decline remained modest and stabilized within normal ranges during 4.1 years of treatment (slope difference, 95% CI: -0.13 [-1.15, 0.89] mL/min/1.73m\(^2\)/year, P\(_{pre–post difference}\) = 0.80).
Conclusions Cardiac hypertrophy, progressing during pretreatment follow-up, appeared to stabilize during sustained agalsidase beta treatment. eGFR decline remained within normal ranges. This suggests that treatment may prevent further Fabry-related progression of cardiomyopathy in female patients and maintain normal kidney function.
A method is reported for making hollow channels within hydrogels decorated with cell‐adhesion peptides exclusively at the channel surface. Sacrificial fibers of different diameters are used to introduce channels within poly(ethylene glycol) hydrogels crosslinked with maleimide‐thiol chemistry, which are backfilled with a cysteine‐containing peptide solution which is conjugated to the lumen with good spatial efficiency. This allows for peptide patterning in only the areas of the hydrogel where they are needed when used as cell‐guides, reducing the amount of required peptide 20‐fold when compared to bulk functionalization. The power of this approach is highlighted by successfully using these patterned hydrogels without active perfusion to guide fibroblasts and olfactory ensheathing cells—the latter having unique potential in neural repair therapies.
Background and Aims: Colonoscopy as standard procedure in endoscopy is often perceived as uncomfortable for patients. Patient's anxiety is therefore a significant issue, which often lead to avoidance of participation of relevant examinations as CRC-screening. Non-pharmacological anxiety management interventions such as music might contribute to relaxation in the phase prior and during endoscopy. Although music's anxiolytic effects have been reported previously, no objective measurement of stress level reduction has been reported yet. Focus of this study was to evaluate the objective measurement of the state of relaxation in patients undergoing colonoscopy.
Methods: Prospective study (n = 196) performed at one endoscopic high-volume center. Standard colonoscopy was performed in control group. Interventional group received additionally self-chosen music over earphones. Facial Electromyography (fEMG) activity was obtained. Clinician Satisfaction with Sedation Instrument (CSSI) and Patients Satisfaction with Sedation Instrument (PSSI) was answered by colonoscopists and patients, respectively. Overall satisfaction with music accompanied colonoscopy was obtained if applicable.
Results: Mean difference measured by fEMG via musculus zygomaticus major indicated a significantly lower stress level in the music group [7.700(±5.560) μV vs. 4.820(±3.330) μV; p = 0.001]. Clinician satisfaction was significantly higher with patients listening to music [82.69(±15.04) vs. 87.3(±15.02) pts.; p = 0.001]. Patient's satisfaction was higher but did not differ significantly.
Conclusions: We conclude that self-chosen music contributes objectively to a reduced stress level for patients and therefore subjectively perceived satisfaction for endoscopists. Therefore, music should be considered as a non-pharmacological treatment method of distress reduction especially in the beginning of endoscopic procedures.
Oxylipine werden in der Pflanze unter Stressbedingungen gebildet. Die dafür notwendige Oxidation von Fettsäuren wird entweder nicht-enzymatisch über Radikale wie reaktive Sauerstoffspezies (ROS) oder enzymatisch über Lipoxygenasen katalysiert. Abhängig von der Position der Oxidation in der Fettsäure entstehen dabei C13- oder C9-Oxylipine. Sehr gut erforscht sind C13-Oxylipine wie Jasmonsäure (JA), die bei biotischem Stress und Verwundung gebildet werden und bei exogener Gabe das Wurzelwachstum von Arabidopsis thaliana hemmen. Die C9-Oxylipine wie 9-Hydroxyoktadekatriensäure (9-HOT) sind erst wenig erforscht. Ziel dieser Arbeit war die Charakterisierung von Transkriptionsfaktoren, mit dem Fokus auf 9-HOT-vermittelte Signalwegen in Arabidopsis thaliana. Da bekannt ist, dass auch sie zu einer Hemmung des Wurzelwachstums führen, wurde dazu die Untersuchung des Wurzelwachstums von 10 Tage alten Keimlingen etabliert. Funktionsgewinn-Mutanten des Transkriptionsfaktors TGA5 sowie des TGA5-Zielgens CYTOCHROM P450 MONOOXYGENASE CYP81D11 zeigten auf 9-HOT ein verglichen mit Col-0 deutlich besseres Wurzelwachstum. Die AtTORF-Ex-Kollektion, eine große Sammlung an Überexpressions-Linien verschiedener Transkriptionsfaktoren, wurde hinsichtlich Wurzelwachstums auf dem Oxylipin 9-HOT analysiert. Die Gesamtheit der untersuchten Pflanzen enthielt 263 unabhängige TF-Expressions-Konstrukte. Von 6087 untersuchten Pflanzen zeigten 201 Pflanzen keine Hemmung des Wurzelwachstums auf 9-HOT. Dabei konnten 80 verschiedene Transkriptionsfaktoren identifiziert werden, deren Überexpression die Wurzelwachstums-hemmende Wirkung von 9-HOT kompensiert. Es zeigte sich eine Häufung von Transkriptionsfaktoren der ERF- (ethylene responsive factor) Familie. Die verstärkte Expression der nahe verwandten Transkriptionsfaktoren ERF106 und ERF107 ermöglichte sowohl auf 9-HOT als auch auf 9-KOT ein längeres Wurzelwachstum im Vergleich zum Wildtyp. Die Genexpression von ERF106 und ERF107 wird durch Überflutung aktiviert. Durch Überflutung wird im Wildtyp die Expression von Hypoxia-Antwort-Genen wie HRE1, SUS4 oder PDC1 induziert. In den Funktionsverlust-Mutanten sind diese Gene in der Expression aber nicht beeinflusst. Auch ist nach Überflutung im normalen Tag / Nacht-Rhythmus kein signifikanter Unterschied im Überleben zwischen Col-0 und den Mutanten erf106, erf107 und erf106xerf107 nachweisbar. Zur Identifikation möglicher Ziel-Gene von ERF106 und ERF107 wurden Transkriptom-Analysen durchgeführt. Die Funktionsverlust-Mutanten erf106, erf107 und erf106xerf107 zeigten weder im Grundzustand noch nach 4 Stunden Überflutung Veränderungen in den bekannten Hypoxia-Antwort-Genen. Die Funktionsgewinn-Mutanten von ERF106 und ERF107 zeigten in der Transkriptom-Analyse eine deutliche Aktivierung von Genen, die wichtig für Entgiftung und Stressabwehr sind. Ebenso wurden wichtige Biosynthese-Gene aus der Camalexin- und Glukosinolat-Synthese in den Funktionsgewinn-Mutanten verstärkt exprimiert. Des Weiteren konnte eine verringerte Expression von Genen beobachtet werden, die wichtig für die Regulation der Eisen-Aufnahme sind, darunter bHLH-Transkriptionsfaktoren, der Eisen-Transporter IRON REGULATED TRANSPORTER 1 (IRT1) und die Eisen-Reduktase FERRIC REDUCTION OXIDASE 2 (FRO2). Zusammenfassend wurden in dieser Arbeit durch die Untersuchung der AtTORF-Ex-Kollektion mehrere TF identifiziert, die wichtige Abwehr-Gene gegen Stress- und Vergiftung sowie bedeutende Gene im Bereich der Biosynthese und Eisenaufnahme regulieren können, um so die Antwort auf C9-Oxylipine zu beeinflussen.
Due to the rapidly increasing development and use of cellular products, there is a rising demand for non-animal-based test platforms to predict, study and treat undesired immunity. Here, we generated human organotypic skin models from human biopsies by isolating and expanding keratinocytes, fibroblasts and microvascular endothelial cells and seeding these components on a collagen matrix or a biological vascularized scaffold matrix in a bioreactor. We then were able to induce inflammation-mediated tissue damage by adding pre-stimulated, mismatched allogeneic lymphocytes and/or inflammatory cytokine-containing supernatants histomorphologically mimicking severe graft versus host disease (GvHD) of the skin. This could be prevented by the addition of immunosuppressants to the models. Consequently, these models harbor a promising potential to serve as a test platform for the prediction, prevention and treatment of GvHD. They also allow functional studies of immune effectors and suppressors including but not limited to allodepleted lymphocytes, gamma-delta T cells, regulatory T cells and mesenchymal stromal cells, which would otherwise be limited to animal models. Thus, the current test platform, developed with the limitation that no professional antigen presenting cells are in place, could greatly reduce animal testing for investigation of novel immune therapies.
Graft-versus-Host Disease (GvHD) stellt einen häufigen, den Gesamterfolg einer allogenen hämatopoetischen Stammzelltransplantation limitierenden Faktor dar. Bei dieser Komplikation attackieren vor allem alloreaktive T-Lymphozyten des Stammzellspenders gesunde Körperzellen des Patienten. Infolgedessen kommt es zu Gewebeschäden in den Zielorganen Haut, Leber und Darm. Die Behandlung der GvHD erfordert eine effektive Immunsuppression, was wiederum Graft-versusTumor-Effekte kompromittiert und den Rückfall der malignen Grunderkrankung bedingen kann. Viele Patienten sprechen aus bisher ungeklärten Gründen nicht auf die klassische immunsuppressive Therapie mit Steroiden oder second-line Therapien an. Neue zelluläre Therapien zur Behandlung der refraktären GvHD sind auf dem Vormarsch, bedürfen aber einer weiterführenden klinischen Testung, auch um die exakten Wirkungsmechanismen zu verstehen. Idealerweise könnten neue Testsysteme das GvHD-Potential von allogenen Stammzellpräparaten oder aber das immunsuppressive Potential von neuen GvHD-Therapien vorhersagen, bevor diese in klinischen Studien eingesetzt werden. Ziel der vorliegenden Arbeit war es, ein erstes, in multiplen Replikaten einsetzbares, humanes organotypisches Gewebemodell zur Simulation einer GvHD-Reaktion am Beispiel der Haut zu etablieren.
Zu diesem Zweck wurden artifizielle humane Hautmodelle unter statischen (KollagenHautmodelle) und dynamischen Kulturbedingungen (vaskularisierte Hautmodelle) generiert. Die Injektion unstimulierter PBMCs (engl. peripheral blood mononuclear cells) führte zu keinen histomorphologischen Veränderungen in den KollagenHautmodellen. Im Gegensatz dazu hatte die Injektion vorstimulierter allogener PBMCs eine Zerstörung der epidermalen Strukturen der Kollagen-Hautmodelle zur Folge, welche vergleichbar waren mit Gewebeschäden bei einer akuten GvHD der Haut. Dieselben Schädigungen der Epidermis wurden durch die Injektion von Mediumüberständen vorstimulierter PBMCs in die Kollagen-Hautmodelle erreicht. Im Kulturmedium der Kollagen-Hautmodelle wurden hohe Konzentrationen von Interleukin 2 und 17, Interferon gamma sowie Tumornekrosefaktor alpha gemessen, wodurch auf die Beteiligung von Zytokinen an der inflammatorischen Reaktion geschlossen werden konnte. Auch im komplexeren vaskularisierten Hautmodell verursachte die Injektion vorstimulierter PBMCs histomorphologische Veränderungen entsprechend einer akuten Haut-GvHD sowie einen zeitabhängigen Anstieg proinflammatorischer Zytokine.
Zusammenfassend zeigen die Resultate dieser Arbeit, dass die Induktion einer starken Inflammations- und Immunreaktion in artifiziellen humanen Hautmodellen, welche histomorphologisch eine GvHD imitiert, möglich ist. Dieses Modell könnte als Grundlage für die Entwicklung eines klinisch relevanten Testsystems zur Bestimmung des GvHD-Restpotentials oder zur Festlegung der immunsuppressiven Kapazität innovativer Zellpräparate dienen. Somit könnten humane artifizielle GvHDModelle in klinischen Studien eingesetzt werden und die Erfahrungen aus Tiermodellen ergänzen sowie erste in vitro Ergebnisse im humanen System liefern, welche dann mit dem tatsächlichen klinischen Resultat verglichen werden könnten.
Die koronare Herzkrankheit ist weltweit die häufigste Todesursache und belastet die Gesellschaft durch Therapien und Arbeitsausfälle mit hohen Kosten. Die Europäischen Gesellschaft für Kardiologie empfiehlt in den Leitlinien zur Sekundärprävention der koronaren Herzkrankheit verschiedene Lebensstiländerungen. In der vorliegenden Arbeit wurde untersucht, wie häufig diese Empfehlungen tatsächlich gegeben werden, ob diese von den Patienten umgesetzt werden und welche Faktoren den Erhalt der Empfehlung bzw. die Umsetzung beeinflussen. Hierzu wurden 536 Probanden mit bekannter KHK aus dem Raum Würzburg im Rahmen der multizentrischen Querschnittsstudie EUROASPIRE IV befragt und untersucht.
Es konnte gezeigt werden, dass die Empfehlungen insgesamt viel zu selten gegeben werden. Als positiver Einflussfaktor für den Erhalt einer Empfehlung konnte die Teilnahme an einem Rehabilitationsprogramm identifiziert werden. Die Wahrscheinlichkeit, die Empfehlungen zu erhalten, sank zudem mit zunehmendem Alter bei Erstdiagnose der KHK. Diese Erkenntnisse können in Zukunft dabei helfen, die Aufklärung über die Risikofaktoren insgesamt und besonders bei älteren Menschen zu intensivieren. Sie untermauern zudem die große Bedeutung eines Rehabilitationsprogrammes bei der Informationsvermittlung.
Auch die Umsetzung der empfohlenen Lebensstilveränderungen erfolgte nicht in zufriedenstellender Häufigkeit. Für die Beendigung des Rauchens konnte die Teilnahme an einem Rehabilitationsprogramm als größter Einflussfaktor ermittelt werden. Die Wahrscheinlichkeit, dass die verschiedenen Maßnahmen zu Lebensstilveränderungen umgesetzt werden, war beim weiblichen Geschlecht deutlich höher als beim männlichen. Die Umsetzung wurde zudem dadurch beeinflusst, ob der Patient vorher die entsprechende Empfehlung erhalten hatte. Die Daten zeigen somit auch bei der Umsetzung der Maßnahmen die Bedeutung von Rehabilitationsprogrammen, besonders für Raucher, und verdeutlichen, dass vor allem bei Männern weitere Anreize geschaffen werden müssen, damit diese die Empfehlungen zur Lebensstiländerung auch umsetzen. Dass viel mehr Probanden die Maßnahmen umgesetzt haben, wenn sie vorher die entsprechende Empfehlung erhalten haben, unterstreicht die außerordentliche Wichtigkeit der umfassenden Aufklärung des Patienten über die existentiellen Chancen eines Lebensstilwandels.
In heart failure, a functional block of complex I of the respiratory chain provokes superoxide generation, which is transformed to H\(_2\)O\(_2\) by dismutation. The Krebs cycle produces NADH, which delivers electrons to complex I, and NADPH for H\(_2\)O\(_2\) elimination via isocitrate dehydrogenase and nicotinamide nucleotide transhydrogenase (NNT). At high NADH levels, α-ketoglutarate dehydrogenase (α-KGDH) is a major source of superoxide in skeletal muscle mitochondria with low NNT activity. Here, we analyzed how α-KGDH and NNT control H\(_2\)O\(_2\) emission in cardiac mitochondria. In cardiac mitochondria from NNT-competent BL/6N mice, H\(_2\)O\(_2\) emission is equally low with pyruvate/malate (P/M) or α-ketoglutarate (α-KG) as substrates. Complex I inhibition with rotenone increases H2O2 emission from P/M, but not α-KG respiring mitochondria, which is potentiated by depleting H\(_2\)O\(_2\)-eliminating capacity. Conversely, in NNT-deficient BL/6J mitochondria, H2O2 emission is higher with α-KG than with P/M as substrate, and further potentiated by complex I blockade. Prior depletion of H\(_2\)O\(_2\)-eliminating capacity increases H\(_2\)O\(_2\) emission from P/M, but not α-KG respiring mitochondria. In cardiac myocytes, downregulation of α-KGDH activity impaired dynamic mitochondrial redox adaptation during workload transitions, without increasing H\(_2\)O\(_2\) emission. In conclusion, NADH from α-KGDH selectively shuttles to NNT for NADPH formation rather than to complex I of the respiratory chain for ATP production. Therefore, α-KGDH plays a key role for H\(_2\)O\(_2\) elimination, but is not a relevant source of superoxide in heart. In heart failure, α-KGDH/NNT-dependent NADPH formation ameliorates oxidative stress imposed by complex I blockade. Downregulation of α-KGDH may, therefore, predispose to oxidative stress in heart failure.
Zinc is an essential trace element for all living organisms. In mammals, including humans and mice, it is required for normal growth, development, hematopoiesis and immune defense. This thesis investigates the influence of zinc on the development of megakaryocytes (MKs), the cells responsible for bone marrow-derived platelet production. Furthermore, a detailed analysis of the expression of zinc import and export transporters (Slc39a/Slc30a genes) is carried out, firstly over the course of MK differentiation and secondly dependent on extracellular zinc.
Background
While multiple in vitro studies examined mesenchymal stromal cells (MSCs) derived from bone marrow or hyaline cartilage, there is little to no data about the presence of MSCs in the joint capsule or the ligamentum capitis femoris (LCF) of the hip joint. Therefore, this in vitro study examined the presence and differentiation potential of MSCs isolated from the bone marrow, arthritic hyaline cartilage, the LCF and full-thickness samples of the anterior joint capsule of the hip joint.
Methods
MSCs were isolated and multiplied in adherent monolayer cell cultures. Osteogenesis and adipogenesis were induced in monolayer cell cultures for 21 days using a differentiation medium containing specific growth factors, while chondrogenesis in the presence of TGF-ss1 was performed using pellet-culture for 27 days. Control cultures were maintained for comparison over the same duration of time. The differentiation process was analyzed using histological and immunohistochemical stainings as well as semiquantitative RT-PCR for measuring the mean expression levels of tissue-specific genes.
Results
This in vitro research showed that the isolated cells from all four donor tissues grew plastic-adherent and showed similar adipogenic and osteogenic differentiation capacity as proven by the histological detection of lipid droplets or deposits of extracellular calcium and collagen type I. After 27 days of chondrogenesis proteoglycans accumulated in the differentiated MSC-pellets from all donor tissues. Immunohistochemical staining revealed vast amounts of collagen type II in all differentiated MSC-pellets, except for those from the LCF. Interestingly, all differentiated MSCs still showed a clear increase in mean expression of adipogenic, osteogenic and chondrogenic marker genes. In addition, the examination of an exemplary selected donor sample revealed that cells from all four donor tissues were clearly positive for the surface markers CD44, CD73, CD90 and CD105 by flow cytometric analysis.
Conclusions
This study proved the presence of MSC-like cells in all four examined donor tissues of the hip joint. No significant differences were observed during osteogenic or adipogenic differentiation depending on the source of MSCs used. Further research is necessary to fully determine the tripotent differentiation potential of cells isolated from the LCF and capsule tissue of the hip joint.
The topical application of tranexamic acid (TXA) helps to prevent post-operative blood loss in total joint replacements. Despite these findings, the effects on articular and periarticular tissues remain unclear. Therefore, this in vitro study examined the effects of varying exposure times and concentrations of TXA on proliferation rates, gene expression and differentiation capacity of chondrocytes and human mesenchymal stromal cells (hMSCs), which underwent osteogenic differentiation. Chondrocytes and hMSCs were isolated and multiplied in monolayer cell cultures. Osteogenic differentiation of hMSCs was induced for 21 days using a differentiation medium containing specific growth factors. Cell proliferation was analyzed using ATP assays. Effects of TXA on cell morphology were examined via light microscopy and histological staining, while expression levels of tissue-specific genes were measured using semiquantitative RT-PCR. After treatment with 50 mg/mL of TXA, a decrease in cell proliferation rates was observed. Furthermore, treatment with concentrations of 20 mg/mL of TXA for at least 48 h led to a visible detachment of chondrocytes. TXA treatment with 50 mg/mL for at least 24 h led to a decrease in the expression of specific marker genes in chondrocytes and osteogenically differentiated hMSCs. No significant effects were observed for concentrations beyond 20 mg/mL of TXA combined with exposure times of less than 24 h. This might therefore represent a safe limit for topical application in vivo. Further research regarding in vivo conditions and effects on hMSC functionality are necessary to fully determine the effects of TXA on articular and periarticular tissues.
Purpose
To assess the impact of isocenter shifts due to linac gantry and table rotation during cranial stereotactic radiosurgery on D\(_{98}\), target volume coverage (TVC), conformity (CI), and gradient index (GI).
Methods
Winston‐Lutz (WL) checks were performed on two Elekta Synergy linacs. A stereotactic quality assurance (QA) plan was applied to the ArcCHECK phantom to assess the impact of isocenter shift corrections on Gamma pass rates. These corrections included gantry sag, distance of collimator and couch axes to the gantry axis, and distance between cone‐beam computed tomography (CBCT) isocenter and treatment beam (MV) isocenter. We applied the shifts via script to the treatment plan in Pinnacle 16.2. In a planning study, isocenter and mechanical rotation axis shifts of 0.25 to 2 mm were applied to stereotactic plans of spherical planning target volumes (PTVs) of various volumes. The shifts determined via WL measurements were applied to 16 patient plans with PTV sizes between 0.22 and 10.4 cm3.
Results
ArcCHECK measurements of a stereotactic treatment showed significant increases in Gamma pass rate for all three measurements (up to 3.8 percentage points) after correction of measured isocenter deviations. For spherical targets of 1 cm3, CI was most severely affected by increasing the distance of the CBCT isocenter (1.22 to 1.62). Gradient index increased with an isocenter‐collimator axis distance of 1.5 mm (3.84 vs 4.62). D98 (normalized to reference) dropped to 0.85 (CBCT), 0.92 (table axis), 0.95 (collimator axis), and 0.98 (gantry sag), with similar but smaller changes for larger targets. Applying measured shifts to patient plans lead to relevant drops in D\(_{98}\) and TVC (7%) for targets below 2 cm\(^3\) treated on linac 1.
Conclusion
Mechanical deviations during gantry, collimator, and table rotation may adversely affect the treatment of small stereotactic lesions. Adjustments of beam isocenters in the treatment planning system (TPS) can be used to both quantify their impact and for prospective correction of treatment plans.
In dieser Arbeit ist die Synthese von funktionalisiertem Nanodiamant mit bioaktiven Substanzen, welche vor allem als Wirkstofftransporter eingesetzt werden sollen, beschrieben. Dazu werden zum einen bereits bekannte Anbindungsmöglichkeiten an Nanodiamant, wie zum Beispiel die Klick-Reaktion, sowie die Ausbildung von Amidbrücken verwendet. Zum anderen werden neuartige Funktionalisierungsmöglichkeiten wie Protein Ligation und Thioharnstoffbrücken verwendet und somit das Repertoire an bekannten Anbindungsreaktion erweitert.
Des weiteren wurde ein multifunktionales Nanodiamantsystem synthetisiert. Dieses ist in der Lage, zwei verschiedene Moleküle auf einem Partikel zu immobilisieren. Die verwendeten Methoden ermöglichen die Anbindung verschiedener Substanzen aus unterschiedlichen Molekülgruppen an Nanodiamanten und sind somit universell einsetzbar.
Solitary bees are subject to a variety of pressures that cause severe population declines. Currently, habitat loss, temperature shifts, agrochemical exposure, and new parasites are identified as major threats. However, knowledge about detrimental bacteria is scarce, although they may disturb natural microbiomes, disturb nest environments, or harm the larvae directly. To address this gap, we investigated 12 Osmia bicornis nests with deceased larvae and 31 nests with healthy larvae from the same localities in a 16S ribosomal RNA (rRNA) gene metabarcoding study. We sampled larvae, pollen provisions, and nest material and then contrasted bacterial community composition and diversity in healthy and deceased nests. Microbiomes of pollen provisions and larvae showed similarities for healthy larvae, whilst this was not the case for deceased individuals. We identified three bacterial taxa assigned to Paenibacillus sp. (closely related to P. pabuli/amylolyticus/xylanexedens), Sporosarcina sp., and Bacillus sp. as indicative for bacterial communities of deceased larvae, as well as Lactobacillus for corresponding pollen provisions. Furthermore, we performed a provisioning experiment, where we fed larvae with untreated and sterilized pollens, as well as sterilized pollens inoculated with a Bacillus sp. isolate from a deceased larva. Untreated larval microbiomes were consistent with that of the pollen provided. Sterilized pollen alone did not lead to acute mortality, while no microbiome was recoverable from the larvae. In the inoculation treatment, we observed that larval microbiomes were dominated by the seeded bacterium, which resulted in enhanced mortality. These results support that larval microbiomes are strongly determined by the pollen provisions. Further, they underline the need for further investigation of the impact of detrimental bacterial acquired via pollens and potential buffering by a diverse pollen provision microbiome in solitary bees.
Insect microbiota plays an essential role on the hosts’ health and fitness, regulating their development, nutrition and immunity. The natural microbiota of bees, in particular, has been given much attention, largely because of the globally reported bee population declines. However, although the worker honey bee has been associated with distinctive and specialized microbiota, the microbiota of solitary bees has not been examined in detail, despite their enormous ecological importance. The main objectives of the present thesis were a) the bacterial community description for various solitary bee species, b) the association of the solitary bee microbiota with ecological factors such as landscape type, c) the relation of the bee foraging preferences with their nest bacterial microbiota, d) the examination of the nest building material contribution to the nest microbiota, e) the isolation of bacterial strains with beneficial or harmful properties for the solitary bee larvae and f) the pathological investigation of bacteria found in deceased solitary bee larvae.
The findings of the present study revealed a high bacterial biodiversity in the solitary bee nests. At the same time, the bacterial communities were different for each bee host species. Furthermore, it was shown that the pollen bacterial communities underwent compositional shifts reflecting a reduction in floral bacteria with progressing larval development, while a clear landscape effect was absent. The examination of the nest pollen provisions showed different foraging preferences for each included bee species. Both the pollen composition and the host species identity had a strong effect on the pollen bacteria, indicating that the pollen bacterial communities are the result of a combinatory process. The introduced environmental material also contributed to the nest natural microbiome. However, although the larval microbiota was significantly influenced by the pollen microbiota, it was not much associated with that of the nest material.
Two Paenibacillus strains isolated from O. bicornis nests showed strong antifungal activities, while several isolated strains were able to metabolize various oligosaccharides which are common in pollen and nectar. Screening for potential pathogenic bacteria in the nests of O. bicornis unveiled bacterial taxa, which dominated the bacterial community in deceased larvae, while at the same time they were undetectable in the healthy individuals.
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Finally, larvae which were raised in vitro developed distinct bacterial microbiomes according to their diet, while their life span was affected.
The present thesis described aspects of the microbiota dynamics in the nests of seven megachilid solitary bee nests, by suggesting which transmission pathways shape the established bacterial communities and how these are altered with larval development. Furthermore, specific bacterial taxa were associated with possible services they might provide to the larvae, while others were related with possible harmful effects. Future studies should integrate microbiota examination of different bee generations and parallel investigation of the microbiota of the nests and their surrounding environment (plant community, soil) to elucidate the bacterial transmission paths which establish the nest microbiota of solitary bees. Functional assays will also allow future studies to characterize specific nest bacteria as beneficial or harmful and describe how they assist the development of healthy bees and the fitness of bee populations.
Maintenance of tumor vasculature integrity is indispensable for tumor growth and thus affects tumor progression. Previous studies have identified platelets as major regulators of tumor vascular integrity, as their depletion selectively renders tumor vessels highly permeable, causing massive intratumoral hemorrhage. While these results establish platelets as potential targets for anti-tumor therapy, depletion is not a treatment option due to the essential role of platelets for hemostasis. This thesis demonstrates for the first time that functional inhibition of glycoprotein (GP) VI on the platelet surface rapidly induces tumor hemorrhage and diminishes tumor growth similar to complete platelet depletion but without inducing systemic bleeding complications. Both, the intratumoral bleeding and tumor growth arrest could be reverted by depletion of Ly6G+ cells confirming them to be responsible for the induction of bleeding and necrosis within the tumor. In addition, GPVI inhibition increased intra-tumoral accumulation of co-administered chemotherapeutic agents, thereby resulting in a profound anti-tumor effect. In summary, this thesis manifests platelet GPVI as a key regulator of vascular integrity specifically in growing tumors, serving as a potential basis for the development of anti-tumor strategies.
In the second part of this thesis, light is shed on the modulating role of bridging integrator 2 (BIN2) in platelet Ca2+ signaling. Stromal interaction molecule 1 (STIM1) mediated store-operated calcium entry (SOCE) is the major route of Ca2+ influx in platelets, triggered by inositol trisphosphate receptor (IP3R)-dependent Ca2+ store release. In this thesis, the BAR domain superfamily member BIN2 was identified as the first Ca2+ signaling modulator, interacting with both, STIM1 and IP3R in platelets. Deletion of BIN2 resulted in reduced Ca2+ store release and Ca2+ influx in response to all tested platelet agonists. These defects were a consequence of impaired IP3R function in combination with defective STIM1-mediated SOC channel activation, while Ca2+ store content and agonist-induced IP3 production were unaltered. These results establish BIN2 as a central regulator of platelet Ca2+ signaling.
The third part of this thesis focuses on the effect of the soluble neuronal guidance protein Sema7A on platelet function. Rosenberger et al. discovered that Sema7A cleavage from red blood cells increases the formation of platelet-neutrophil complexes, thereby reinforcing thrombo-inflammation in myocardial ischemia-reperfusion injury (MIRI). This thesis establishes soluble Sema7A as a stimulator of platelet thrombus formation via its interaction with platelet GPIbα, thereby reinforcing PNC formation. Thus, interfering with the GPIb-Sema7A interaction during MIRI represents a potential strategy to reduce cardiac damage and improve clinical outcome following MI.
Ellagitannins are signature constituents of oak wood and their consumption has been associated with various health benefits. In vivo, they undergo metabolic degradation including gut microbial metabolism yielding urolithins. Only limited data is available about compounds being present in blood after intake of an extract from French oak wood, Robuvit®. In the course of a randomized, double-blind, controlled clinical investigation, 66 patients undergoing hysterectomy received placebo or 300 mg Robuvit® per day before and over 8 weeks after surgery. Serum and blood cell samples were analyzed by liquid chromatography electrospray ionization tandem mass spectrometry (LC-ESI-MS/MS). The number of urolithin producers and the urolithin levels increased after intake of Robuvit®. In serum samples, the median concentration of urolithin A was 14.0 ng/ml [interquartile range (IQR) 57.4] after 8 weeks. Urolithin B was determined at 22.3 ng/ml (IQR 12.6), urolithin C at 2.66 ng/ml (IQR 2.08). In blood cells, lower concentrations and only urolithins A and B were detected. A statistically significant association of lower post-surgical pain scores with metabotype A was detected (p < 0.05). To conclude, supplementation with French oak wood extract raised urolithin generation in patients and suggested health advantages for urolithin-producers.
The muscarinic M\(_1\) acetylcholine receptor is an important drug target for the treatment of various neurological disorders. Designing M\(_1\) receptor-selective drugs has proven challenging, mainly due to the high conservation of the acetylcholine binding site among muscarinic receptor subtypes. Therefore, less conserved and topographically distinct allosteric binding sites have been explored to increase M\(_1\) receptor selectivity. In this line, bitopic ligands, which target orthosteric and allosteric binding sites simultaneously, may provide a promising strategy. Here, we explore the allosteric, M1-selective BQCAd scaffold derived from BQCA as a starting point for the design, synthesis, and pharmacological evaluation of a series of novel bitopic ligands in which the orthosteric moieties and linker lengths are systematically varied. Since β-arrestin recruitment seems to be favorable to therapeutic implication, all the compounds were investigated by G protein and β-arrestin assays. Some bitopic ligands are partial to full agonists for G protein activation, some activate β-arrestin recruitment, and the degree of β-arrestin recruitment varies according to the respective modification. The allosteric BQCAd scaffold controls the positioning of the orthosteric ammonium group of all ligands, suggesting that this interaction is essential for stimulating G protein activation. However, β-arrestin recruitment is not affected. The novel set of bitopic ligands may constitute a toolbox to study the requirements of β-arrestin recruitment during ligand design for therapeutic usage.
Im Rahmen dieser Arbeit wurden die elektronischen Eigenschaften von Graphen auf Metalloberflächen mittels Rastertunnelmikroskopie und Quasiteilcheninterferenz (englisch quasiparticle interference, QPI)-Messungen untersucht. Durch das Verwenden schwerer Substrate sollte die Spin-Bahn-Wechselwirkung des Graphen verstärkt werden und damit eine Bandlücke am K-Punkt der Bandstruktur mittels QPI beobachtet werden. Um das Messen von QPI auf Graphen zu testen, wurde auf der Oberfläche eines SiC(0001)-Kristalls durch Erhitzen Graphen erzeugt und mit dem Rastertunnelmikroskop untersucht. Dieses System wurde schon ausführlich in der Literatur beschrieben und bereits bekannte QPI-Messungen von Streuringen, die auf den Dirac-Kegeln des Graphen am K-Punkt basieren, konnte ich auf gr/SiC(0001) in guter Qualität erfolgreich reproduzieren. Anschließend wurde Graphen nach einem wohlbekannten Verfahren durch Aufbringen von Ethylen auf ein erhitztes Ir(111)-Substrat erzeugt. Dieses gr/Ir(111)-System diente auch als Grundlage für Interkalationsversuche von Bismut (gr/Bi/Ir(111)) und Gadolinium (gr/Gd/Ir(111)) zwischen das Graphen und das Substrat. Auf gr/Bi/Ir(111) wurde ein schon aus der Literatur bekanntes Netzwerk aus Versetzungslinien beobachtet, dem zusätzlich eine Temperaturabhängigkeit nachgewiesen werden konnte. Beim Versuch, Gadolinium zu interkalieren, wurden zwei verschieden Oberflächenstrukturen beobachtet, die auf eine unterschiedlich Anordnung bzw. Menge des interkalierten Gadoliniums zurückzuführen sein könnten. Auf keinem dieser drei Systeme konnten allerdings Streuringe mittels QPI beobachtet werden. Als Vorbereitung der Interkalation von Gadolinium wurden dessen Wachstum und magnetische Eigenschaften auf einem W(110)-Kristall untersucht. Dabei konnte eine aus der Literatur bekannte temperaturabhängige Austauschaufspaltung reproduziert werden. Darüber hinaus konnten sechs verschieden magnetische Domänen beobachtet werden. Zusätzlich sind auf der Oberfläche magnetische Streifen auszumachen, die möglicherweise auf einer Spinspirale basieren. Als Grundlage für die mögliche zukünftige Erzeugung Graphen-artiger Molekülgitter wurde das Wachstum von H-TBTQ und Me-TBTQ auf Ag(111) untersucht. Die Moleküle richten sich dabei nach der Oberflächenstruktur des Silber aus und bilden längliche Inseln, deren Kanten in drei Vorzugsrichtungen verlaufen. Auf H-TBTQ wurde zudem eine zweite, Windmühlen-artige Ausrichtung der Moleküle auf der Oberfläche beobachtet. Auf den mit den Molekülen bedeckten Stellen der Oberfläche wurde eine Verschiebung des Ag-Oberflächenzustands beobachtet, die mit einem Ladungstransfer vom Ag(111)-Substrat auf die TBTQ-Moleküle zu erklären sein könnte.
Die Hypophosphatasie (HPP) ist eine seltene, angeborene Knochen- und Systemerkrankung, welche Patienten allen Alters betrifft. Verursacht wird die Erkrankung durch Mutationen im ALPL-Gen, welches für die gewebeunspezifische Alkalische Phosphatase codiert und mit einem Funktionsverlust des Enzyms einhergeht. Die Ausprägung der klinischen Symptomatik ist sehr heterogen und reicht von milden und unspezifischen bis hin zu potenziell lebensbedrohlichen Symptomen, was die korrekte Diagnose zusätzlich erschwert und verzögert. Um das Verständnis der pädiatrischen HPP zu verbessern und die Dauer von Symptombeginn bis zur korrekten Diagnose zu verkürzen, haben wir den Verlauf der Erkrankung anhand einer retrospektiven Aufarbeitung der Daten von 50 pädiatrischen HPP Patienten, die in den letzten 25 Jahren an der Universitäts-Kinderklinik in Würzburg vorstellig waren, untersucht.
Diese Ergebnisse bestätigen den klinischen Eindruck der HPP als chronische Systemerkrankung, welche aufgrund ihrer unspezifischen klinischen Präsentation oftmals nur mit zeitlicher Verzögerung diagnostiziert wird. Dieser Verzögerung kommt insbesondere im Hinblick auf die 2015 zur Behandlung der pädiatrischen HPP zugelassenen Enzymersatztherapie mit dem Wirkstoff Asfotase alfa eine besondere Bedeutung zu, da die Patienten von einer frühzeitigen Diagnose und einem damit einhergehenden frühzeitigen Beginn der Behandlung profitieren können.
Diese Ergebnisse tragen einen Teil dazu bei, das Bewusstsein und die Kenntnis der Erkrankung zu verbessern, um so die die Zeitspanne zwischen Symptombeginn und Diagnosestellung zu verkürzen und die medizinische Versorgung der Patienten zu verbessern.
Background
Hypophosphatasia (HPP) is a rare, inherited metabolic disorder caused by loss-of-function mutations in the ALPL gene that encodes the tissue-nonspecific alkaline phosphatase TNAP (ORPHA 436). Its clinical presentation is highly heterogeneous with a remarkably wide-ranging severity. HPP affects patients of all ages. In children HPP-related musculoskeletal symptoms may mimic rheumatologic conditions and diagnosis is often difficult and delayed. To improve the understanding of HPP in children and in order to shorten the diagnostic time span in the future we studied the natural history of the disease in our large cohort of pediatric patients. This single centre retrospective chart review included longitudinal data from 50 patients with HPP diagnosed and followed at the University Children's Hospital Wuerzburg, Germany over the last 25 years.
Results
The cohort comprises 4 (8%) perinatal, 17 (34%) infantile and 29 (58%) childhood onset HPP patients. Two patients were deceased at the time of data collection. Diagnosis was based on available characteristic clinical symptoms (in 88%), low alkaline phosphatase (AP) activity (in 96%), accumulating substrates of AP (in 58%) and X-ray findings (in 48%). Genetic analysis was performed in 48 patients (31 compound heterozygous, 15 heterozygous, 2 homozygous mutations per patient), allowing investigations on genotype-phenotype correlations. Based on anamnestic data, median age at first clinical symptoms was 3.5 months (min. 0, max. 107), while median time to diagnosis was 13 months (min. 0, max. 103). Common symptoms included: impairment of motor skills (78%), impairment of mineralization (72%), premature loss of teeth (64%), musculoskeletal pain and craniosynostosis (each 64%) and failure to thrive (62%). Up to now 20 patients started medical treatment with Asfotase alfa.
Conclusions
Reported findings support the clinical perception of HPP being a chronic multi-systemic disease with often delayed diagnosis. Our natural history information provides detailed insights into the prevalence of different symptoms, which can help to improve and shorten diagnostics and thereby lead to an optimised medical care, especially with promising therapeutic options such as enzyme-replacement-therapy with Asfotase alfa in mind.
The enrichment of deadwood is essential for the conservation of saproxylic biodiversity in managed forests. However, existing strategies focus on a cost‐intensive increase of deadwood amount, while largely neglecting increasing deadwood diversity.
Deadwood objects, that is logs and branches, from six tree species were experimentally sun exposed, canopy shaded and artificially shaded for 4 years, after which the alpha‐, beta‐ and gamma‐diversity of saproxylic beetles, wood‐inhabiting fungi and spiders were analysed. Analyses of beta‐diversity included the spatial distance between exposed deadwood objects. A random‐drawing procedure was used to identify the combination of tree species and sun exposure that yielded the highest gamma‐diversity at a minimum of exposed deadwood amount.
In sun‐exposed plots, species numbers in logs were higher than in shaded plots for all taxa, while in branches we observed the opposite for saproxylic beetles. Tree species affected the species numbers only of saproxylic beetles and wood‐inhabiting fungi. The beta‐diversity of saproxylic beetles and wood‐inhabiting fungi among logs was influenced by sun exposure and tree species, but beta‐diversity of spiders by sun exposure only. For all saproxylic taxa recorded in logs, differences between communities increased with increasing spatial distance.
A combination of canopy‐shaded Carpinus logs and sun‐exposed Populus logs resulted in the highest species numbers of all investigated saproxylic taxa among all possible combinations of tree species and sun‐exposure treatments.
Synthesis and applications. We recommend incorporating the enrichment of different tree species and particularly the variation in sun exposure into existing strategies of deadwood enrichment. Based on the results of our study, we suggest to combine the logs of softwood broadleaf tree species (e.g. Carpinus, Populus), hardwood broadleaf tree species (e.g. Quercus) and coniferous tree species (e.g. Pinus) under different conditions of sun exposure and distribute them spatially in a landscape to maximize the beneficial effects on overall diversity.
Our body is colonized by a vast array of bacteria the sum of which forms our microbiota. The gut alone harbors >1,000 bacterial species. An understanding of their individual or synergistic contributions to human health and disease demands means to interfere with their functions on the species level. Most of the currently available antibiotics are broad‐spectrum, thus too unspecific for a selective depletion of a single species of interest from the microbiota. Programmable RNA antibiotics in the form of short antisense oligonucleotides (ASOs) promise to achieve precision manipulation of bacterial communities. These ASOs are coupled to small peptides that carry them inside the bacteria to silence mRNAs of essential genes, for example, to target antibiotic‐resistant pathogens as an alternative to standard antibiotics. There is already proof‐of‐principle with diverse bacteria, but many open questions remain with respect to true species specificity, potential off‐targeting, choice of peptides for delivery, bacterial resistance mechanisms and the host response. While there is unlikely a one‐fits‐all solution for all microbiome species, I will discuss how recent progress in bacterial RNA biology may help to accelerate the development of programmable RNA antibiotics for microbiome editing and other applications.
Mycotoxins in agriculturally used plants can cause intoxication in animals and can lead to severe financial losses for farmers. The endophytic fungus Epichloë festucae var. lolii living symbiotically within the cool season grass species Lolium perenne can produce vertebrate and invertebrate toxic alkaloids. Hence, an exact quantitation of alkaloid concentrations is essential to determine intoxication risk for animals. Many studies use different methods to detect alkaloid concentrations, which complicates the comparability. In this study, we showed that alkaloid concentrations of individual plants exceeded toxicity thresholds on real world grasslands in Germany, but not on the population level. Alkaloid concentrations on five German grasslands with high alkaloid levels peaked in summer but were also below toxicity thresholds on population level. Furthermore, we showed that alkaloid concentrations follow the same seasonal trend, regardless of whether plant fresh or dry weight was used, in the field and in a common garden study. However, alkaloid concentrations were around three times higher when detected with dry weight. Finally, we showed that alkaloid concentrations can additionally be biased to different alkaloid detection methods. We highlight that toxicity risks should be analyzed using plant dry weight, but concentration trends of fresh weight are reliable.