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Institute
- Institut für Pharmakologie und Toxikologie (407) (remove)
Sonstige beteiligte Institutionen
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The comet assay is widely used in basic research, genotoxicity testing, and human biomonitoring. However, interpretation of the comet assay data might benefit from a better understanding of the future fate of a cell with DNA damage. DNA damage is in principle repairable, or if extensive, can lead to cell death. Here, we have correlated the maximally induced DNA damage with three test substances in TK6 cells with the survival of the cells. For this, we selected hydrogen peroxide (H\(_{2}\)O\(_{2}\)) as an oxidizing agent, methyl methanesulfonate (MMS) as an alkylating agent and etoposide as a topoisomerase II inhibitor. We measured cell viability, cell proliferation, apoptosis, and micronucleus frequency on the following day, in the same cell culture, which had been analyzed in the comet assay. After treatment, a concentration dependent increase in DNA damage and in the percentage of non-vital and apoptotic cells was found for each substance. Values greater than 20-30% DNA in tail caused the death of more than 50% of the cells, with etoposide causing slightly more cell death than H\(_{2}\)O\(_{2}\) or MMS. Despite that, cells seemed to repair of at least some DNA damage within few hours after substance removal. Overall, the reduction of DNA damage over time is due to both DNA repair and death of heavily damaged cells. We recommend that in experiments with induction of DNA damage of more than 20% DNA in tail, survival data for the cells are provided.
The comet assay is a commonly used method to determine DNA damage and repair activity in many types of samples. In recent years, the use of the comet assay in human biomonitoring became highly attractive due to its various modified versions, which may be useful to determine individual susceptibility in blood samples. However, in human biomonitoring studies, working with large sample numbers that are acquired over an extended time period requires some additional considerations. One of the most important issues is the storage of samples and its effect on the outcome of the comet assay. Another important question is the suitability of different blood preparations. In this study, we analysed the effect of cryopreservation on DNA damage and repair activity in human blood samples. In addition, we investigated the suitability of different blood preparations. The alkaline and FPG as well as two different types of repair comet assay and an in vitro hydrogen peroxide challenge were applied. Our results confirmed that cryopreserved blood preparations are suitable for investigating DNA damage in the alkaline and FPG comet assay in whole blood, buffy coat and PBMCs. Ex vivo hydrogen peroxide challenge yielded its optimal effect in isolated PBMCs. The utilised repair comet assay with either UVC or hydrogen peroxide-induced lesions and an aphidicolin block worked well in fresh PBMCs. Cryopreserved PBMCs could not be used immediately after thawing. However, a 16-h recovery with or without mitotic stimulation enabled the application of the repair comet assay, albeit only in a surviving cell fraction.
The US National Research Council (NRC) report "Toxicity Testing in the 21st Century: A Vision and a strategy (Tox21)", published in 2007, calls for a complete paradigm shift in tox-icity testing. A central aspect of the proposed strategy includes the transition from apical end-points in in vivo studies to more mechanistically based in vitro tests. To support and facilitate the transition and paradigm shift in toxicity testing, the Adverse Outcome Pathway (AOP) concept is widely recognized as a pragmatic tool. As case studies, the AOP concept was ap-plied in this work to develop AOPs for proximal tubule injuries initiated by Receptor-mediated endocytosis and lysosomal overload and Inhibition of mtDNA polymerase-. These AOPs were used as a mechanistic basis for the development of in vitro assays for each key event (KE). To experimentally support the developed in vitro assays, proximal tubule cells from rat (NRK-52E) and human (RPTEC/TERT1) were treated with model compounds. To measure the dis-turbance of lysosomal function in the AOP – Receptor-mediated endocytosis and lysosomal overload, polymyxin antibiotics (polymyxin B, colistin, polymyxin B nonapeptide) were used as model compounds. Altered expression of lysosomal associated membrane protein 1/2 (LAMP-1/2) (KE1) and cathepsin D release from lysosomes (KE2) were determined by im-munofluorescence, while cytotoxicity (KE3) was measured using the CellTiter-Glo® cell via-bility assay. Importantly, significant differences in polymyxin uptake and susceptibility be-tween cell lines were observed, underlining the importance of in vitro biokinetics to determine an appropriate in vitro point of departure (PoD) for risk assessment. Compared to the in vivo situation, distinct expression of relevant transporters such as megalin and cubilin on mRNA and protein level in the used cell lines (RPTEC/TERT1 and NRK-52E) could not be con-firmed, making integration of quantitative in vitro to in vivo extrapolations (QIVIVE) neces-sary. Integration of QIVIVE by project partners of the University of Utrecht showed an im-provement in the modelled biokinetic data for polymyxin B. To assess the first key event, (KE1) Depletion of mitochondrial DNA, in the AOP – Inhibition of mtDNA polymerase-, a RT-qPCR method was used to determine the mtDNA copy number in cells treated with mod-el compounds (adefovir, cidofovir, tenofovir, adefovir dipivoxil, tenofovir disoproxil fumarate). Mitochondrial toxicity (KE2) was measured by project partners using the high-content imaging technique and MitoTracker® whereas cytotoxicity (KE3) was determined by CellTiter-Glo® cell viability assay. In contrast to the mechanistic hypothesis underlying the AOP – Inhibition of mtDNA polymerase-, treatment with model compounds for 24 h resulted in an increase rather than a decrease in mtDNA copy number (KE1). Only minor effects on mitochondrial toxicity (KE2) and cytotoxicity (KE3) were observed. Treatment of RPT-EC/TERT1 cells for 14 days showed only a slight decrease in mtDNA copy number after treatment with adefovir dipivoxil and tenofovir disoproxil fumarate, underscoring some of the limitations of short-term in vitro systems. To obtain a first estimation for risk assessment based on in vitro data, potential points of departure (PoD) for each KE were calculated from the obtained in vitro data. The most common PoDs were calculated such as the effect concentra-tion at which 10 % or 20_% effect was measured (EC10, EC20), the highest no observed effect concentration (NOEC), the lowest observed effect concentration (LOEC), the benchmark 10 % (lower / upper) concentrations (BMC10, BMCL10, BMCU10) and a modelled non-toxic con-centration (NtC). These PoDs were then compared with serum and tissue concentrations de-termined from in vivo studies after treatment with therapeutic / supratherapeutic doses of the respective drugs in order to obtain a first estimate of risk based on in vitro data. In addition, AOPs were used to test whether the quantitative key event relationships between key events allow prediction of downstream effects and effects on the adverse outcome (AO) based on measurements of an early key event. Predictions of cytotoxicity from the mathematical rela-tionships showed good concordance with measured cytotoxicity after treatment with colistin and polymyxin b nonapeptide. The work also revealed uncertainties and limitations of the ap-plied strategy, which have a significant impact on the prediction and on a risk assessment based on in vitro results.
In the heart the β\(_1\)-adrenergic receptor (AR) and the β\(_2\)-AR, two prototypical G protein-coupled receptors (GPCRs), are both activated by the same hormones, namely adrenaline and noradrenaline. Both receptors couple to stimulatory G\(_s\) proteins, mediate an increase in cyclic adenosine monophosphate (cAMP) and influence the contractility and frequency of the heart upon stimulation. However, activation of the β\(_1\)-AR, not the β\(_2\)-AR, lead to other additional effects, such as changes in gene transcription resulting in cardiac hypertrophy, leading to speculations on how distinct effects can arise from receptors coupled to the same downstream signaling pathway.
In this thesis the question of whether this distinct behavior may originate from a differential localization of these two receptors in adult cardiomyocytes is addressed. Therefore, fluorescence spectroscopy tools are developed and implemented in order to elucidate the presence and dynamics of these endogenous receptors at the outer plasma membrane as well as on the T-tubular network of intact adult cardiomyocytes. This allows the visualization of confined localization and diffusion of the β\(_2\)-AR to the T-tubular network at endogenous expression. In contrast, the β\(_1\)-AR is found diffusing at both the outer plasma membrane and the T-tubules. Upon overexpression of the β\(_2\)-AR in adult transgenic cardiomyocytes, the receptors experience a loss of this compartmentalization and are also found at the cell surface. These data suggest that distinct signaling and functional effects can be controlled by specific cell surface targeting of the receptor subtypes.
The tools at the basis of this thesis work are a fluorescent adrenergic antagonist in combination of fluorescence fluctuation spectroscopy to monitor the localization and dynamics of the lowly expressed adrenergic receptors. Along the way to optimizing these approaches, I worked on combining widefield and confocal imaging in one setup, as well as implementing a stable autofocus mechanism using electrically tunable lenses.
Einfluss des Gewichtsverlusts auf den oxidativen Stress und den DNS-Schaden in adipösen Patient*innen nach bariatrischer Chirurgie
Adipositas ist eine Erkrankung, die durch ein erhöhtes Krebsrisiko neben zahlreichen anderen Komorbiditäten mit weitreichenden Folgen für die Gesundheit adipöser Patient*innen einhergeht. In der Pathogenese der adipositas-assoziierten Krebsarten sind dabei ein erhöhter oxidativer Stress sowie die damit einhergehende Schädigung der DNS maßgeblich beteiligt. Im Umkehrschluss wurde in der vorliegenden Arbeit der Einfluss eines durch bariatrische Chirurgie induzierten Gewichtsverlusts auf den oxidativen Stress und DNS-Schaden in adipösen Patient*innen anhand von Blutproben präoperativ sowie 6 und 12 Monate postoperativ untersucht. In einer Subpopulation der Patient*innen konnte eine tendenzielle Verringerung des DNS-Schadens anhand des Comet-Assays in peripheren Lymphozyten beobachtet werden. Im Hinblick auf den oxidativen Stress wurde im Plasma die Eisenreduktionsfähigkeit als Maß für antioxidative Kapazität sowie Malondialdehyd als Surrogatmarker für das Ausmaß an Lipidperoxidation bestimmt. Weiterhin wurde in Erythrozyten das Gesamtglutathion und oxidierte Glutathion bestimmt. Die oxidativen Stressparameter zeigten insgesamt nach einer initialen Zunahme im oxidativen Stress 6 Monate postoperativ eine rückläufige Tendenz im oxidativen Stress am Studienende. Somit geben die Beobachtungen dieser Arbeit Anlass zur Hoffnung, dass adipöse Patient*innen durch einen bariatrisch induzierten Gewichtsverlust von einer Verringerung des Krebsrisikos profitieren könnten.
Analysis of the Frequency of Kidney Toxicity in Preclinical Safety Studies using the eTOX Database
(2022)
This research aimed to obtain reliable data on the frequency of different
types of renal toxicity findings in 28-day oral gavage studies in Wistar rats, their
consistency across species and study duration, as well as the correlation between histopathological endpoints and routinely used clinical chemistry parameters indicative of kidney injury. Analysis of renal histopathological findings was
carried out through extraction of information from the IMI eTOX database.
Spontaneous renal histopathological findings in 28-day oral gavage studies in control Wistar rats and beagle dogs confirmed tubular basophilia and renal
dilation as the most frequent incidental findings in controls, whereas necrosis
and glomerulosclerosis were not identified at all or only rarely as a background
lesion.
Histopathological evidence of necrosis and glomerulosclerosis was associated with changes in clinical chemistry parameters in 28-day oral gavage
Wistar rat studies. Necrosis was frequently accompanied by a statistically significant rise in serum creatinine and serum urea, whereas serum albumin was
frequently found to decrease statistically significantly in treatment groups in
which necrosis was recorded. In contrast to necrosis, glomerulosclerosis was
not associated with statistically significant changes in serum creatinine and urea
in any of the 28-day oral gavage Wistar rat treatment groups, but appears to be
best reflected by a pattern of statistically significantly lowered serum albumin
and serum protein together with a statistically significant increase in serum cholesterol. As might have been expected based on the high background incidences
of tubular basophilia and dilation, no consistent changes in any of the clinical
chemistry parameters were evident in animals in which renal lesions were confined to renal tubular basophilia or dilation. In summary, the routinely provided
clinical chemistry parameters are rather insensitive - novel kidney biomarkers
such as Cystatin C, β-trace protein and Kidney injury molecule 1 should further
be evaluated and integrated into routine preclinical and clinical practice. However, evaluation of clinical chemistry data was limited by the lack of individual
animal data. Even though an extensive amount of preclinical studies is accessible
through the eTOX database, comparison of consistency across time was limited
by the limited number of shorter- and longer term studies conducted with the
compounds identified as causing renal histopathological changes within a 28-
day study in rats. A high consistency across time for both treatment-related tubular basophilia and treatment-related dilation cannot be confirmed for either of
the two effects as these two findings were both induced only rarely in studies
over a different treatment-duration other than 28 days after administration of the
compounds which provoked the respective effect in a 28-day study. For the
finding of necrosis consistency across time was low with the exception of
“AZ_GGA_200002321”, in which renal papillary necrosis was identified consistently throughout different treatment durations (2, 4, 26, 104 weeks). No shorter and longer-term studies were available for the compounds identified as causing
glomerulosclerosis within a 28-day study in rats.
No consistent findings of the selected histopathological endpoints were
identified in any of the corresponding 28-day oral gavage beagle dog studies
after treatment with the identical compounds, which caused the respective effect after 28-day treatment in rats. However, in the overwhelming majority of
cases, beagle dogs were administered lower doses in these studies in comparison to the corresponding 28-day Wistar rat studies.
Searching the eTOX database yielded no 28-day oral gavage studies in
Wistar and Wistar Han rats in which accumulation of hyaline droplets, tubular
atrophy or hyperplasia was recorded. Only one 28-day oral gavage Wistar rat
study was identified with the histopathological result of neutrophilic inflammation. Consequently, evaluation of these four renal findings in relation to clinical
chemistry parameters and consistency across time and species cannot be
made.
In summary, this work contributes knowledge through mining and evaluating the eTOX database on a variety of specific renal endpoints that frequently
occur after administration of trial substances in 28-day oral gavage studies in
Wistar rats in the field of preclinical toxicity with specific focus on their frequency relation to background findings, as well as consistency across time and species. Targeted statistical evaluation of in vivo data within joint research ventures
such as the eTOX project, presents an enormous opportunity for an innovative
future way of aiding preclinical research towards a more efficient research in the
preclinical stage of drug development. This could be achieved through the augmentation of methodological strategies and possibly novel software tools in order to predict in vivo toxicology of new molecular entities by means of information that is already available before early stages of the drug development
pipeline begin.
Cyclic adenosine monophosphate (cAMP), the ubiquitous second messenger produced upon stimulation of GPCRs which couple to the stimulatory GS protein, orchestrates an array of physiological processes including cardiac function, neuronal plasticity, immune responses, cellular proliferation and apoptosis. By interacting with various effector proteins, among others protein kinase A (PKA) and exchange proteins directly activated by cAMP (Epac), it triggers signaling cascades for the cellular response. Although the functional outcomes of GSPCR-activation are very diverse depending on the extracellular stimulus, they are all mediated exclusively by this single second messenger. Thus, the question arises how specificity in such responses may be attained. A hypothesis to explain signaling specificity is that cellular signaling architecture, and thus precise operation of cAMP in space and time would appear to be essential to achieve signaling specificity. Compartments with elevated cAMP levels would allow specific signal relay from receptors to effectors within a micro- or nanometer range, setting the molecular basis for signaling specificity. Although the paradigm of signaling compartmentation gains continuous recognition and is thoroughly being investigated, the molecular composition of such compartments and how they are maintained remains to be elucidated. In addition, such compartments would require very restricted diffusion of cAMP, but all direct measurements have indicated that it can diffuse in cells almost freely.
In this work, we present the identification and characterize of a cAMP signaling compartment at a GSPCR. We created a Förster resonance energy transfer (FRET)-based receptor-sensor conjugate, allowing us to study cAMP dynamics in direct vicinity of the human glucagone-like peptide 1 receptor (hGLP1R). Additional targeting of analogous sensors to the plasma membrane and the cytosol enables assessment of cAMP dynamics in different subcellular regions. We compare both basal and stimulated cAMP levels and study cAMP crosstalk of different receptors. With the design of novel receptor nanorulers up to 60nm in length, which allow mapping cAMP levels in nanometer distance from the hGLP1R, we identify a cAMP nanodomain surrounding it. Further, we show that phosphodiesterases (PDEs), the only enzymes known to degrade cAMP, are decisive in constraining cAMP diffusion into the cytosol thereby maintaining a cAMP gradient. Following the discovery of this nanodomain, we sought to investigate whether downstream effectors such as PKA are present and active within the domain, additionally studying the role of A-kinase anchoring proteins (AKAPs) in targeting PKA to the receptor compartment. We demonstrate that GLP1-produced cAMP signals translate into local nanodomain-restricted PKA phosphorylation and determine that AKAP-tethering is essential for nanodomain PKA.
Taken together, our results provide evidence for the existence of a dynamic, receptor associated cAMP nanodomain and give prospect for which key proteins are likely to be involved in its formation. These conditions would allow cAMP to exert its function in a spatially and temporally restricted manner, setting the basis for a cell to achieve signaling specificity. Understanding the molecular mechanism of cAMP signaling would allow modulation and thus regulation of GPCR signaling, taking advantage of it for pharmacological treatment.
G-protein-coupled receptors (GPCRs) represent one of the most important classes of drug targets. The discovery of new GCPR therapeutics would greatly benefit from the development of a generalizable high-throughput assay to directly monitor their activation or de-activation. Here we screened a variety of labels inserted into the third intracellular loop and the C-terminus of the alpha(2 Lambda)-adrenergic receptor and used fluorescence (FRET) and bioluminescence resonance energy transfer (BRET) to monitor ligand-binding and activation dynamics. We then developed a universal intramolecular BRET receptor sensor design to quantify efficacy and potency of GPCR ligands in intact cells and real time. We demonstrate the transferability of the sensor design by cloning beta(2)-adrenergic and PTH1-receptor BRET sensors and monitored their efficacy and potency. For all biosensors, the Z factors were well above 0.5 showing the suitability of such design for microtiter plate assays. This technology will aid the identification of novel types of GPCR ligands.
Patienten mit arterieller Hypertonie haben ein erhöhtes Risiko eine Tumorerkrankung, insbesondere Nierenzellkarzinome, zu entwickeln. Die arterielle Hypertonie ist über die Entstehung von oxidativem Stress mit der Entwicklung von DNA-Schäden verknüpft, wobei ein hochreguliertes Renin-Angiotensin-Aldosteron-System (RAAS) eine entscheidende Rolle einnimmt. Das Ziel dieser Arbeit war es zum einen Hypertoniker (HypAll) und gesunde Kontrollen und zum anderen gut (HypGut) und schlecht (HypSch) eingestellte Hypertoniker unter Berücksichtigung der eingenommenen Antihypertensiva bezüglich ihrer Level an oxidativem Stress und DNA-Schäden zu vergleichen. Zusätzlich erfolgte im Rahmen einer Längsschnittanalyse der intraindividuelle Vergleich unter den Hypertonikern. Hierfür erfolgte die Bestimmung von SHp, D-ROM und 3-Nitrotyrosin als Marker für oxidativen Stress im Plasma, von 8-oxodG, 15-F2t-Isoprostan und Malondialdehyd als Marker für oxidativen Stress im Urin und von γ-H2AX und Mikrokernen als Marker für DNA-Schäden in Lymphozyten.
Dabei konnte ein erhöhter oxidativer Stress in der HypAll-Gruppe verglichen zu den Kontrollen anhand aller Marker für oxidativen Stress mit Ausnahme von Malondialdehyd festgestellt werden. Nach Altersadjustierung zeigte sich dieser Gruppenunterschied nur noch für die Proteinstressmarker SHp und 3-Nitrotyrosin signifikant. Bezüglich der Marker für DNA-Schäden ergab sich kein Unterschied zwischen HypAll und Kontrollen. Ebenso zeigte sich kein signifikanter Unterschied in den Leveln für oxidativen Stress und DNA-Schäden zwischen der HypGut- und HypSch-Gruppe. Zuletzt konnte im Rahmen der Längsschnittstudie ein positiver Zusammenhang zwischen der Entwicklung des Blutdrucks und des oxidativen Stresses anhand der Veränderung von D-ROM und des systolischen Blutdrucks beobachtet werden.
Die teils nicht-signifikanten und teils mangelnden Unterschiede zwischen HypAll und Kontrollen sowie zwischen HypGut und HypSch sind am ehesten durch das besondere Patientengut, welches sich auch grundlegend von dem anderer vergleichbarer Studien unterscheidet, erklärbar. Die Patienten mit therapieresistenter Hypertonie (TRH) zeichnen sich durch eine langjährige Einnahme zahlreicher Antihypertensiva aus. Diese, insbesondere die RAAS-wirksamen, besitzen eine über die reine Blutdrucksenkung hinausgehende antioxidative und antigenotoxische Wirkung, welche vermutlich zu einer Angleichung der Level für oxidativen Stress und DNA-Schäden geführt hat.
Um die Dynamik der Biomarker und den Einfluss der Antihypertensiva auf oxidativen Stress und DNA-Schäden besser zu verstehen, sind weitere Studien über einen längeren Beobachtungszeitraum sowie mit zusätzlich therapienaiven Hypertonikern sinnvoll. Die weitere Erforschung von Biomarkern, um sie im klinischen Alltag zur Verbesserung der Patientenbehandlung einsetzen zu können, ist notwendig.
Pyridoxal 5′‐phosphate (PLP) is an essential cofactor for neurotransmitter metabolism. Pyridoxal phosphatase (PDXP) deficiency in mice increases PLP and γ‐aminobutyric acid levels in the brain, yet how PDXP is regulated is unclear. Here, we identify the Ca\(^{2+}\)‐ and integrin‐binding protein 1 (CIB1) as a PDXP interactor by yeast two‐hybrid screening and find a calmodulin (CaM)‐binding motif that overlaps with the PDXP‐CIB1 interaction site. Pulldown and crosslinking assays with purified proteins demonstrate that PDXP directly binds to CIB1 or CaM. CIB1 or CaM does not alter PDXP phosphatase activity. However, elevated Ca\(^{2+}\) concentrations promote CaM binding and, thereby, diminish CIB1 binding to PDXP, as both interactors bind in a mutually exclusive way. Hence, the PDXP‐CIB1 complex may functionally differ from the PDXP‐Ca\(^{2+}\)‐CaM complex.