TY  - JOUR
A1  - Proetel, Ulrike
A1  - Pletsch, Nadine
A1  - Lauseker, Michael
A1  - Müller, Martin C.
A1  - Hanfstein, Benjamin
A1  - Krause, Stefan W.
A1  - Kalmanti, Lida
A1  - Schreiber, Annette
A1  - Heim, Dominik
A1  - Baerlocher, Gabriela M.
A1  - Hofmann, Wolf-Karsten
A1  - Lange, Elisabeth
A1  - Einsele, Hermann
A1  - Wernli, Martin
A1  - Kremers, Stephan
A1  - Schlag, Rudolf
A1  - Müller, Lothar
A1  - Hänel, Mathias
A1  - Link, Hartmut
A1  - Hertenstein, Bernd
A1  - Pfirrmann, Markus
A1  - Hochhaus, Andreas
A1  - Hasford, Joerg
A1  - Hehlmann, Rüdiger
A1  - Saußele, Susanne
T1  - Older patients with chronic myeloid leukemia (≥65 years) profit more from higher imatinib doses than younger patients: a subanalysis of the randomized CML-Study IV
JF  - Annals of Hematology
N2  - The impact of imatinib dose on response rates and survival in older patients with chronic myeloid leukemia in chronic phase has not been studied well. We analyzed data from the German CML-Study IV, a randomized five-arm treatment optimization study in newly diagnosed BCR-ABL-positive chronic myeloid leukemia in chronic phase. Patients randomized to imatinib 400 mg/day (IM400) or imatinib 800 mg/day (IM800) and stratified according to age (≥65 years vs. <65 years) were compared regarding dose, response, adverse events, rates of progression, and survival. The full 800 mg dose was given after a 6-week run-in period with imatinib 400 mg/day. The dose could then be reduced according to tolerability. A total of 828 patients were randomized to IM400 or IM800. Seven hundred eighty-four patients were evaluable (IM400, 382; IM800, 402). One hundred ten patients (29 %) on IM400 and 83 (21 %) on IM800 were ≥65 years. The median dose per day was lower for patients ≥65 years on IM800, with the highest median dose in the first year (466 mg/day for patients ≥65 years vs. 630 mg/day for patients <65 years). Older patients on IM800 achieved major molecular remission and deep molecular remission as fast as younger patients, in contrast to standard dose imatinib with which older patients achieved remissions much later than younger patients. Grades 3 and 4 adverse events were similar in both age groups. Five-year relative survival for older patients was comparable to that of younger patients. We suggest that the optimal dose for older patients is higher than 400 mg/day. ClinicalTrials.gov identifier: NCT00055874
KW  - chronic myeloid leukemia
KW  - older patients
KW  - different imatinib dose regimens
KW  - early applied higher imatinib dosages
Y1  - 2014
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-121574
SN  - 0939-5555
VL  - 93
IS  - 7
ER  - 
TY  - JOUR
A1  - Radchuk, Volodymyr
A1  - Rajiv, Sharma
A1  - Potokina, Elena
A1  - Radchuk, Ruslana
A1  - Weier, Diana
A1  - Munz, Eberhard
A1  - Schreiber, Miriam
A1  - Mascher, Martin
A1  - Stein, Nils
A1  - Wicker, Thomas
A1  - Kilian, Benjamin
A1  - Borisjuk, Ljudmilla
T1  - The highly divergent \(Jekyll\) genes, required for sexual reproduction, are lineage specific for the related grass tribes Triticeae and Bromeae
JF  - Plant Journal
N2  - Phylogenetically related groups of species contain lineage-specific genes that exhibit no sequence similarity to any genes outside the lineage. We describe here that the Jekyll gene, required for sexual reproduction, exists in two much diverged allelic variants, Jek1 and Jek3. Despite low similarity, the Jek1 and Jek3 proteins share identical signal peptides, conserved cysteine positions and direct repeats. The Jek1/Jek3 sequences are located at the same chromosomal locus and inherited in a monogenic Mendelian fashion. Jek3 has a similar expression as Jek1 and complements the Jek1 function in Jek1-deficient plants. Jek1 and Jek3 allelic variants were almost equally distributed in a collection of 485 wild and domesticated barley accessions. All domesticated barleys harboring the Jek1 allele belong to single haplotype J1-H1 indicating a genetic bottleneck during domestication. Domesticated barleys harboring the Jek3 allele consisted of three haplotypes. Jekyll-like sequences were found only in species of the closely related tribes Bromeae and Triticeae but not in other Poaceae. Non-invasive magnetic resonance imaging revealed intrinsic grain structure in Triticeae and Bromeae, associated with the Jekyll function. The emergence of Jekyll suggests its role in the separation of the Bromeae and Triticeae lineages within the Poaceae and identifies the Jekyll genes as lineage-specific.
KW  - gene alleles
KW  - lineage-specific genes
KW  - Triticeae
KW  - Hordeum vulgare
KW  - Triticum aestivum
KW  - gene family evolution
KW  - plant reproduction
Y1  - 2019
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-224769
VL  - 98
IS  - 6
ER  - 
TY  - JOUR
A1  - Wohnrade, Camilla
A1  - Velling, Ann-Kathrin
A1  - Mix, Lucas
A1  - Wurster, Claudia D.
A1  - Cordts, Isabell
A1  - Stolte, Benjamin
A1  - Zeller, Daniel
A1  - Uzelac, Zeljko
A1  - Platen, Sophia
A1  - Hagenacker, Tim
A1  - Deschauer, Marcus
A1  - Lingor, Paul
A1  - Ludolph, Albert C.
A1  - Lulé, Dorothée
A1  - Petri, Susanne
A1  - Osmanovic, Alma
A1  - Schreiber-Katz, Olivia
T1  - Health-related quality of life in spinal muscular atrophy patients and their caregivers — a prospective, cross-sectional, multi-center analysis
JF  - Brain Sciences
N2  - Spinal muscular atrophy (SMA) is a disabling disease that affects not only the patient’s health-related quality of life (HRQoL), but also causes a high caregiver burden (CGB). The aim of this study was to evaluate HRQoL, CGB, and their predictors in SMA. In two prospective, cross-sectional, and multi-center studies, SMA patients (n = 39) and SMA patient/caregiver couples (n = 49) filled in the EuroQoL Five Dimension Five Level Scale (EQ-5D-5L) and the Short Form Health Survey 36 (SF-36). Caregivers (CGs) additionally answered the Zarit Burden Interview (ZBI) and the Hospital Anxiety and Depression Scale (HADS). Patients were clustered into two groups with either low or high HRQoL (EQ-5D-5L index value <0.259 or >0.679). The latter group was mostly composed of ambulatory type III patients with higher motor/functional scores. More severely affected patients reported low physical functioning but good mental health and vitality. The CGB (mean ZBI = 22/88) correlated negatively with patients’ motor/functional scores and age. Higher CGB was associated with a lower HRQoL, higher depression and anxiety, and more health impairments of the CGs. We conclude that patient and CG well-being levels interact closely, which highlights the need to consider the health of both parties while evaluating novel treatments.
KW  - caregiver
KW  - caregiver burden
KW  - mental health
KW  - quality of life
KW  - spinal muscular atrophy
KW  - patient reported outcome measures
Y1  - 2023
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-305048
SN  - 2076-3425
VL  - 13
IS  - 1
ER  - 
TY  - THES
A1  - Schreiber, Benjamin
T1  - Selective and enhanced fluorescence by biocompatible nanocoatings to monitor G-protein-coupled receptor dynamics
T1  - Selektive und verstärkte Fluoreszenz durch biokompatible Nanobeschichtungen zur Untersuchung von G-protein-gekoppelten Rezeptoren und ihrer Dynamik
N2  - Fluorescence microscopy has become one of the most important techniques for the imaging of biological cells and tissue, since the technique allows for selective labeling with fluorescent molecules and is highly suitable for low-light applications down to the single molecule regime. The methodological requirements are well-defined for studying membrane receptors within a highly localized nanometer-thin membrane. For example, G-protein-coupled receptors (GPCRs) are an extensively studied class of membrane receptors that represent one of the most important pharmaceutical targets. Ligand binding and GPCR activation dynamics are suspected to take place at the millisecond scale and may even be far faster. Thus, techniques that are fast, selective, and live-cell compatible are required to monitor GPCR dynamics. Fluorescence resonance energy transfer (FRET) and total internal reflection fluorescence microscopy (TIRF-M) are methods of choice to monitor the dynamics of GPCRs selectively within the cell membrane. 
Despite the remarkable success of these modalities, there are limitations. Most importantly, inhomogeneous illumination can induce imaging artifacts, rendering spectroscopic evaluation difficult. Background signal due to scattering processes or imperfect labeling can hamper the signal-to-noise, thus limiting image contrast and acquisition speed. Careful consideration of the internal physiology is required for FRET sensor design, so that ligand binding and cell compatibility are well-preserved despite the fluorescence labeling procedures. This limitation of labeling positions leads to very low signal changes in FRET-based GPCR analysis. In addition, microscopy of these systems becomes even more challenging in single molecule or low-light applications where the accuracy and temporal resolution may become dramatically low. Fluorescent labels should therefore be brighter, protected from photobleaching, and as small as possible to avoid interference with the binding kinetics. The development of new fluorescent molecules and labeling methods is an ongoing process. However, a complete characterization of new labels and sensors takes time. So far, the perfect dye system for GPCR studies has not been found, even though there is high demand. 
Thus, this thesis explores and applies a different approach based on improved illumination schemes for TIRF-M as well as metal-coated coverslips to enhance fluorescence and FRET efficiency. First, it is demonstrated that a 360° illumination scheme reduces typical TIRF artifacts and produces a much more homogenously illuminated field of view. Second, membrane imaging and FRET spectroscopy are improved by metal coatings that are used to modulate the fluorescent properties of common fluorescent dyes. Computer simulation methods are used to understand the underlying photophysics and to design the coatings. Third, this thesis explores the operational regime and limitations of plasmonic approaches with high sectioning capabilities. The findings are summarized by three publications that are presented in the results section of this work. In addition, the theory of fluorescence and FRET is explained, with particular attention to its emission modulations in the vicinity of metal-dielectric layers. Details of the instrumentation, computer simulations, and cell culture are described in the method section. The work concludes with a discussion of the findings within the framework of recent technological developments as well as perspectives and suggestions for future approaches complete the presented work.
N2  - Die Fluoreszenzmikroskopie ist zu einer der wichtigsten Techniken für die Bildgebung biologischer Zellen und Gewebe geworden, da die Technik eine selektive Markierung mit fluoreszierenden Molekülen ermöglicht und sich hervorragend für Anwendungen bei schwachem Licht bis hin zum Einzelmolekül-Regime eignet. Die methodischen Anforderungen sind gut definiert, um Membranrezeptoren innerhalb einer stark lokalisierten nanometerdünnen Membran zu untersuchen. Zum Beispiel sind G-Protein-gekoppelte Rezeptoren (GPCRs) eine ausführlich untersuchte Klasse von Membranrezeptoren, weil diese wichtige pharmazeutische Ziele darstellen. Es wird vermutet, dass die Ligandenbindungs- und GPCR-Aktivierungsdynamiken im Millisekundenbereich stattfinden und sogar viel schneller sein können. Daher sind Techniken erforderlich, die schnell, selektiv und lebend-Zell kompatibel sind, um die GPCR-Dynamik zu aufzunehmen. Fluoreszenzresonanzenergietransfer (FRET) und internale Totalreflexions-Fluoreszenzmikroskopie (TIRF-M) sind Methoden der Wahl, um die Dynamik von GPCRs selektiv innerhalb der Zellmembran zu untersuchen.
Trotz des bemerkenswerten Erfolgs dieser Modalitäten gibt es Einschränkungen. Am wichtigsten ist, dass eine inhomogene Beleuchtung Artefakte erzeugen kann, welche die spektroskopische Auswertung erschweren. Hintergrundsignale aufgrund von Streuprozessen oder unvollständiger Markierung können das Signal-Rausch-Verhältnis beeinträchtigen und somit den Bildkontrast und die Erfassungsgeschwindigkeit begrenzen. Eine sorgfältige Berücksichtigung der internen Physiologie ist für das Design der FRET-Sensoren ist erforderlich, so dass die Ligandenbindung und die Zellkompatibilität trotz der Fluoreszenzmarkierungsverfahren nicht gestört werden. Diese Einschränkung der Markierungspositionen führt zu sehr geringen Signalkontrast in der FRET-basierten GPCR-Analyse. Darüber hinaus wird die Mikroskopie dieser Systeme bei Einzelmolekül- oder Schwachlichtanwendungen, bei denen die Genauigkeit und die zeitliche Auflösung dramatisch niedrig werden können, noch schwieriger. Fluoreszierende Marker sollten daher heller, vor Photobleichung geschützt und so klein wie möglich sein, um Störungen mit der Rezeptorkinetik zu vermeiden. Die Entwicklung neuer fluoreszierender Moleküle und Markierungsmethoden ist ein fortlaufender Prozess. Eine vollständige Charakterisierung neuer Marker und Sensoren benötigt jedoch Zeit. Bis jetzt wurde das perfekte Farbstoffsystem für GPCR-Studien noch nicht gefunden, auch wenn es eine hohe Nachfrage dafür gibt.
Daher wird ein anderer Ansatz auf der Grundlage verbesserter Beleuchtungsschemata für TIRF-M sowie metallbeschichtete Deckgläser zur Verbesserung der Fluoreszenz- und FRET-Effizienz untersucht. Zunächst wird gezeigt, dass ein 360 ° Beleuchtung typische TIRF-Artefakte reduziert und ein wesentlich homogeneres Bildausleuchtung erzeugt. Zweitens wurde durch die Modulation der Fluoreszenzeigenschaften gängiger Fluoreszenzfarbstoffe die Membranbildgebung und FRET-Spektroskopie verbessert. Computersimulationsmethoden werden verwendet, um die zugrundeliegende Photophysik zu verstehen und zielgerichtet Beschichtungen zu entwerfen. Drittens wurden das operationelle Regime und die Grenzen von plasmonischen Ansätzen mit noch höheren Signalselektiverung untersucht. Die Ergebnisse sind in drei Publikationen zusammengefasst, die im Ergebnisteil dieser Arbeit vorgestellt werden. Darüber hinaus wird die Theorie der Fluoreszenz und des FRET unter besonderer Berücksichtigung ihrer Emissionsmodulationen in der Nähe von Metall-Dielektrikum-Schichten erläutert. Details der Instrumentierung, Computersimulationen und Zellkultur werden im Abschnitt Methoden beschrieben. Die Arbeit schließt mit einer Diskussion der Ergebnisse im Rahmen der jüngsten technologischen Entwicklungen sowie mit Perspektiven und Vorschlägen für zukünftige Ansätze, die die vorliegende Arbeit abrunden.
KW  - G-Protein gekoppelte Rezeptoren
KW  - Fluorescence
KW  - Microscopy
KW  - Plasmonic
KW  - Fluorescence Resonance Energy Transfer
KW  - G Protein-Coupled Receptors
KW  - Fluoreszenzmikroskopie
KW  - Fluorescence Microscopy
Y1  - 2018
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-173923
ER  - 
TY  - JOUR
A1  - Schischlevskij, Pavel
A1  - Cordts, Isabell
A1  - Günther, René
A1  - Stolte, Benjamin
A1  - Zeller, Daniel
A1  - Schröter, Carsten
A1  - Weyen, Ute
A1  - Regensburger, Martin
A1  - Wolf, Joachim
A1  - Schneider, Ilka
A1  - Hermann, Andreas
A1  - Metelmann, Moritz
A1  - Kohl, Zacharias
A1  - Linker, Ralf A.
A1  - Koch, Jan Christoph
A1  - Stendel, Claudia
A1  - Müschen, Lars H.
A1  - Osmanovic, Alma
A1  - Binz, Camilla
A1  - Klopstock, Thomas
A1  - Dorst, Johannes
A1  - Ludolph, Albert C.
A1  - Boentert, Matthias
A1  - Hagenacker, Tim
A1  - Deschauer, Marcus
A1  - Lingor, Paul
A1  - Petri, Susanne
A1  - Schreiber-Katz, Olivia
T1  - Informal caregiving in amyotrophic lateral sclerosis (ALS): a high caregiver burden and drastic consequences on caregivers' lives
JF  - Brain Sciences
N2  - Amyotrophic lateral sclerosis (ALS) is a fatal neurodegenerative disease that causes progressive autonomy loss and need for care. This does not only affect patients themselves, but also the patients’ informal caregivers (CGs) in their health, personal and professional lives. The big efforts of this multi-center study were not only to evaluate the caregivers' burden and to identify its predictors, but it also should provide a specific understanding of the needs of ALS patients' CGs and fill the gap of knowledge on their personal and work lives. Using standardized questionnaires, primary data from patients and their main informal CGs (n = 249) were collected. Patients' functional status and disease severity were evaluated using the Barthel Index, the revised Amyotrophic Lateral Sclerosis Functional Rating Scale (ALSFRS-R) and the King’s Stages for ALS. The caregivers' burden was recorded by the Zarit Burden Interview (ZBI). Comorbid anxiety and depression of caregivers were assessed by the Hospital Anxiety and Depression Scale. Additionally, the EuroQol Five Dimension Five Level Scale evaluated their health-related quality of life. The caregivers' burden was high (mean ZBI = 26/88, 0 = no burden, ≥24 = highly burdened) and correlated with patients' functional status (r\(_p\) = −0.555, p < 0.001, n = 242). It was influenced by the CGs' own mental health issues due to caregiving (+11.36, 95% CI [6.84; 15.87], p < 0.001), patients' wheelchair dependency (+9.30, 95% CI [5.94; 12.66], p < 0.001) and was interrelated with the CGs' depression (r\(_p\) = 0.627, p < 0.001, n = 234), anxiety (r\(_p\) = 0.550, p < 0.001, n = 234), and poorer physical condition (r\(_p\) = −0.362, p < 0.001, n = 237). Moreover, female CGs showed symptoms of anxiety more often, which also correlated with the patients' impairment in daily routine (r\(_s\) = −0.280, p < 0.001, n = 169). As increasing disease severity, along with decreasing autonomy, was the main predictor of caregiver burden and showed to create relevant (negative) implications on CGs' lives, patient care and supportive therapies should address this issue. Moreover, in order to preserve the mental and physical health of the CGs, new concepts of care have to focus on both, on not only patients but also their CGs and gender-associated specific issues. As caregiving in ALS also significantly influences the socioeconomic status by restrictions in CGs' work lives and income, and the main reported needs being lack of psychological support and a high bureaucracy, the situation of CGs needs more attention. Apart from their own multi-disciplinary medical and psychological care, more support in care and patient management issues is required.
KW  - amyotrophic lateral sclerosis (ALS)
KW  - informal caregiving
KW  - caregiver burden
KW  - functional status
KW  - decreasing autonomy
KW  - depression
KW  - anxiety
KW  - health-related quality of life
KW  - socioeconomic status
KW  - psychological support
Y1  - 2021
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-240981
SN  - 2076-3425
VL  - 11
IS  - 6
ER  - 
TY  - JOUR
A1  - Peseschkian, Tara
A1  - Cordts, Isabell
A1  - Günther, René
A1  - Stolte, Benjamin
A1  - Zeller, Daniel
A1  - Schröter, Carsten
A1  - Weyen, Ute
A1  - Regensburger, Martin
A1  - Wolf, Joachim
A1  - Schneider, Ilka
A1  - Hermann, Andreas
A1  - Metelmann, Moritz
A1  - Kohl, Zacharias
A1  - Linker, Ralf A.
A1  - Koch, Jan Christoph
A1  - Büchner, Boriana
A1  - Weiland, Ulrike
A1  - Schönfelder, Erik
A1  - Heinrich, Felix
A1  - Osmanovic, Alma
A1  - Klopstock, Thomas
A1  - Dorst, Johannes
A1  - Ludolph, Albert C.
A1  - Boentert, Matthias
A1  - Hagenacker, Tim
A1  - Deschauer, Marcus
A1  - Lingor, Paul
A1  - Petri, Susanne
A1  - Schreiber-Katz, Olivia
T1  - A nation-wide, multi-center study on the quality of life of ALS patients in Germany
JF  - Brain Sciences
N2  - Improving quality of life (QoL) is central to amyotrophic lateral sclerosis (ALS) treatment. This Germany-wide, multicenter cross-sectional study analyses the impact of different symptom-specific treatments and ALS variants on QoL. Health-related QoL (HRQoL) in 325 ALS patients was assessed using the Amyotrophic Lateral Sclerosis Assessment Questionnaire 5 (ALSAQ-5) and EuroQol Five Dimension Five Level Scale (EQ-5D-5L), together with disease severity (captured by the revised ALS Functional Rating Scale (ALSFRS-R)) and the current care and therapies used by our cohort. At inclusion, the mean ALSAQ-5 total score was 56.93 (max. 100, best = 0) with a better QoL associated with a less severe disease status (β = −1.96 per increase of one point in the ALSFRS-R score, p < 0.001). “Limb-onset” ALS (lALS) was associated with a better QoL than “bulbar-onset” ALS (bALS) (mean ALSAQ-5 total score 55.46 versus 60.99, p = 0.040). Moreover, with the ALSFRS-R as a covariate, using a mobility aid (β = −7.60, p = 0.001), being tracheostomized (β = −14.80, p = 0.004) and using non-invasive ventilation (β = −5.71, p = 0.030) were associated with an improved QoL, compared to those at the same disease stage who did not use these aids. In contrast, antidepressant intake (β = 5.95, p = 0.007), and increasing age (β = 0.18, p = 0.023) were predictors of worse QoL. Our results showed that the ALSAQ-5 was better-suited for ALS patients than the EQ-5D-5L. Further, the early and symptom-specific clinical management and supply of assistive devices can significantly improve the individual HRQoL of ALS patients. Appropriate QoL questionnaires are needed to monitor the impact of treatment to provide the best possible and individualized care.
KW  - Amyotrophic Lateral Sclerosis (ALS)
KW  - Amyotrophic Lateral Sclerosis Assessment Questionnaire 5 (ALSAQ-5)
KW  - ALS treatment
KW  - “bulbar-onset” ALS (bALS)
KW  - “limb-onset” ALS (lALS)
KW  - EuroQol Five Dimension Five Level Scale (EQ-5D-5L)
KW  - health-related quality of life (HRQoL)
KW  - quality of life (QoL)
KW  - symptom-specific treatment
KW  - assistive devices
Y1  - 2021
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-234147
SN  - 2076-3425
VL  - 11
IS  - 3
ER  - 
TY  - JOUR
A1  - Heil, Hannah S.
A1  - Schreiber, Benjamin
A1  - Götz, Ralph
A1  - Emmerling, Monika
A1  - Dabauvalle, Marie-Christine
A1  - Krohne, Georg
A1  - Höfling, Sven
A1  - Kamp, Martin
A1  - Sauer, Markus
A1  - Heinze, Katrin G.
T1  - Sharpening emitter localization in front of a tuned mirror
JF  - Light: Science & Applications
N2  - Single-molecule localization microscopy (SMLM) aims for maximized precision and a high signal-to-noise ratio1. Both features can be provided by placing the emitter in front of a metal-dielectric nanocoating that acts as a tuned mirror2,3,4. Here, we demonstrate that a higher photon yield at a lower background on biocompatible metal-dielectric nanocoatings substantially improves SMLM performance and increases the localization precision by up to a factor of two. The resolution improvement relies solely on easy-to-fabricate nanocoatings on standard glass coverslips and is spectrally and spatially tunable by the layer design and wavelength, as experimentally demonstrated for dual-color SMLM in cells.
KW  - imaging and sensing
KW  - super-resolution microscopy
Y1  - 2018
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-228080
VL  - 7
ER  -