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Infants and young children (IYC) remain the most vulnerable population group to environmental hazards worldwide, especially in economically developing regions such as sub-Saharan Africa (SSA). As a result, several governmental and non-governmental institutions including health, environmental and food safety networks and researchers have been proactive toward protecting this group. Mycotoxins, toxic secondary fungal metabolites, contribute largely to the health risks of this young population. In SSA, the scenario is worsened by socioeconomic status, poor agricultural and storage practices, and low level of awareness, as well as the non-establishment and lack of enforcement of regulatory limits in the region. Studies have revealed mycotoxin occurrence in breast milk and other weaning foods. Of concern is the early exposure of infants to mycotoxins through transplacental transfer and breast milk as a consequence of maternal exposure, which may result in adverse health effects. The current paper presents an overview of mycotoxin occurrence in foods intended for IYC in SSA. It discusses the imperative evidence of mycotoxin exposure of this population group in SSA, taking into account consumption data and the occurrence of mycotoxins in food, as well as biomonitoring approaches. Additionally, it discusses the health implications associated with IYC exposure to mycotoxins in SSA.
1.2-Dioxetanes, very reactive and high energy molecules. are involved as labile intermediates in dioxygenase- activated aerobic metabolism and in physiological processes. Various toxico1ogica1 tests reveal that dioxetanes are indeed genotoxic. In supercoiled DNA of bacteriophage PM2 they induce endonucleasesensitive sites, most of them are FPG protein-sensitive base modifications (8-hydroxyguanine, fonnamidopyrimidines). Pyrimidinedimersand sites ofbase loss (AP sites) which were probed by UV endonuclease and exonuclease 111 are minor lesions in this system. While the alky1-substituted dioxetanes do not show any significant mutagenic activity in different Salmonella typhimurium strains, heteroarene dioxetanes such as benzofuran and furocoumarin dioxetanes are strongly mutagenic in S. typhimurium strain TA I 00. DNA adducts formed with an intermediary alkyJating agent appear to be responsible for the mutagenic activity of benzofuran dioxetane. We assume that the benzofuran epoxides, generated in situ from benzofuran dioxetanes by deoxygenation are the ultimate mutagens of the latter. since benzofuran epoxides are highly mutagenic in the S. typhimurium strain TAIOO and they form DNA adducts. as detected by the 212Ppostlabelling technique. Our results imply that the type of D NA darnage promoted by dioxetanes is dependent on the structural feature of dioxetanes. Furthermore, the direct photochemical DNA darnage by energy transfer. i.e., pyrimidine dimers, plays a minor role in the genotoxicity of dioxetanes. Instead, photooxidation dominates in isolated DNA. while radical darnage and alkylation prevail in the cellular system.
Einfluß der Dialysetherapie auf den Genomschaden von Nierenpatienten in einer prospektiven Studie
(2007)
Patienten mit terminaler Niereninsuffizienz haben im Vergleich zur Normalbevölkerung eine deutlich erhöhte Inzidenz maligner Erkrankungen. Frühere Untersuchungen zeigten, dass periphere Blutlymphozyten dieser Patienten einen höheren genetischen Schaden aufweisen, wodurch das Risiko einer malignen Entartung steigt. In dieser Arbeit wurde der genetische Schaden mithilfe zweier Testverfahren, Comet Assay und Mikrokerntest, untersucht. Es handelte sich um eine prospektive Studie mit zwei Patientenkollektiven. Die erste Gruppe bestand aus Patienten, die aufgrund einer terminalen Niereninsuffizienz innerhalb der nächsten Monate eine Dialysetherapie mittels konventioneller Hämodialyse beginnen mußten. Die zweite Gruppe bildeten Dialysepatienten, die im Verlauf von konventioneller Dialyse auf Hämodiafiltration umgestellt wurden. Bei allen Patienten wurde der genetische Schaden der peripheren Blutlymphozyten in den Monaten vor und nach Therapiebeginn bzw. Therapieumstellung regelmäßig untersucht. Unsere Ergebnisse zeigen, dass 4 der 10 Prädialysepatienten nach Beginn der Dialyse einen niedrigeren genetischen Schaden hatten, 2 Patienten hatten unterschiedliche Werte in Comet Assay und Mikrokerntest und bei 2 Patienten ergab sich im Verlauf eine höhere DNA-Schädigung. Die verbliebenen 2 Patienten mußten aufgrund einer konstant bleibenden Niereninsuffizienz nicht mit der Dialysetherapie beginnen. Bei Zusammenfassung aller Einzelwerte zeigte sich, dass das Kollektiv der Prädialysepatienten insgesamt vom Beginn der Behandlung profitiert hat. In der Gruppe der Dialysepatienten hatte 2 von 7 Patienten nach Umstellung auf Hämodiafiltration eine geringere DNA-Schädigung, 2 Patienten zeigten unterschiedliche Ergebnisse im Comet Assay und Mikrokerntest und 2 weitere Patienten wiesen eine höheren genetischen Schaden in den Lymphozyten auf. Ein Patient konnte bei fehlenden Vorwerten nicht berücksichtigt werden. Im Gruppenvergleich zeigte sich für alle Dialysepatienten ein gleichbleibender DNA-Schaden, gemessen mithilfe des Comet Assays bei leicht erhöhten Mikrokernraten. Jedoch hatte sich die Zellproliferation ebenfalls etwas verbessert. Zusammenfassend ergibt sich somit in beiden Gruppen kein eindeutiges Ergebnis, woraus neue Therapieempfehlungen für Patienten mit terminaler Niereninsuffizienz abzuleiten wären. Um weiter Einflußvariablen auf die Höhe des genetischen Schadens festzustellen, sind weiter Untersuchungen mit größeren Patientenkollektiven erforderlich.
Spatially restricting cAMP production to discrete subcellular locations permits selective regulation of specific functional responses. But exactly where and how cAMP signaling is confined is not fully understood. Different receptors and adenylyl cyclase isoforms responsible for cAMP production are not uniformly distributed between lipid raft and non-lipid raft domains of the plasma membrane. We sought to determine the role that these membrane domains play in organizing cAMP responses in HEK293 cells. The freely diffusible FRET-based biosensor Epac2-camps was used to measure global cAMP responses, while versions of the probe targeted to lipid raft (Epac2-MyrPalm) and non-raft (Epac2-CAAX) domains were used to monitor local cAMP production near the plasma membrane. Disruption of lipid rafts by cholesterol depletion selectively altered cAMP responses produced by raft-associated receptors. The results indicate that receptors associated with lipid raft as well as non-lipid raft domains can contribute to global cAMP responses. In addition, basal cAMP activity was found to be significantly higher in non-raft domains. This was supported by the fact that pharmacologic inhibition of adenylyl cyclase activity reduced basal cAMP activity detected by Epac2-CAAX but not Epac2-MyrPalm or Epac2-camps. Responses detected by Epac2-CAAX were also more sensitive to direct stimulation of adenylyl cyclase activity, but less sensitive to inhibition of phosphodiesterase activity. Quantitative modeling was used to demonstrate that differences in adenylyl cyclase and phosphodiesterase activities are necessary but not sufficient to explain compartmentation of cAMP associated with different microdomains of the plasma membrane.
Fernale BALB/c mice were administered intragastrically with equimolar amounts of either [2-\(^{14}\)C]2-amino-3,8-dimethyi[ 4,5-J]qulnoxaline (MeiQx) or 2-acetylamino[9-\(^{14}\)C]fluorene (2AAF). DNA was isolated from tissues of mice killed either 6 or 24 h after administration. Analysis of liver DNA nucleotide digests by HPLC analysis revealed that all of the radioactivity was attributable to adduct formation. Tbe specific activities of DNA samples were converted to covalent bindlog indices (CBI, J.LIDOI adduct per mol DNA nucleotides/mmol chemical app6ed per kg animal body weight). CBI values of 25 and 9 were detennined for 2AAF and MeiQx in tbe llvers of mice killed 6 h after dosing. The values were in general agreement with the moderate carcinogenic potency of these compounds. The specific activities of DNA preparations obtained from the lddneys, spleens, stomachs, small intestines and large intestlnes of mice treated witb MeiQx and killed 6 h after doslng were S- to 35-times less tban those obtained witb the llver. DNA isolated from tbe lungs (a target organ for MeiQx tumorigenicity) of MeiQx-treated mice was not radiolabeUed at tbe limit of detection (CBI <0.3). With tbe exception of tbe gastrolntestinal tract, the specific activities of DNA samples isolated from mice killed 6 h after administration were higher than those from mice killed after 24 h.
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.
Lamivudine (3TC), a drug used in the treatment of HIV infection, needs to cross the plasma membrane to exert its therapeutic action. Human Organic cation transporter 1 (hOCT1), encoded by the SLC22A1 gene, is the transporter responsible for its uptake into target cells. As SLC22A1 is a highly polymorphic gene, the aim of this study was to determine how SNPs in the OCT1-encoding gene affected 3TC internalization and its interaction with other co-administered drugs. HEK293 cells stably transfected with either the wild type form or the polymorphic variants of hOCT1 were used to perform kinetic and drug-drug interaction studies. Protein co-immunoprecipitation was used to assess the impact of selected polymorphic cysteines on the oligomerization of the transporter. Results showed that 3TC transport efficiency was reduced in all polymorphic variants tested (R61C, C88R, S189L, M420del, and G465R). This was not caused by lack of oligomerization in case of variants located at the transporter extracellular loop (R61C and C88R). Drug-drug interaction measurements showed that co-administered drugs [abacavir (ABC), zidovudine (AZT), emtricitabine (FTC), tenofovir diproxil fumarate (TDF), efavirenz (EFV) and raltegravir (RAL)], differently inhibited 3TC uptake depending upon the polymorphic variant analyzed. These data highlight the need for accurate analysis of drug transporter polymorphic variants of clinical relevance, because polymorphisms can impact on substrate (3TC) translocation but even more importantly they can differentially affect drug-drug interactions at the transporter level.
Die menschliche Nahrung enthält antioxidative Stoffe, die den Menschen möglicherweise vor oxidativem Stress und seinen Konsequenzen schützen können. Im Fokus der vorliegenden Arbeit standen Anthocyane, die als vielversprechende antioxidative Pflanzenstoffe in unterschiedlichen Obst- und Gemüsesorten zu finden sind.
Im ersten Teil der Arbeit wurden in einem HT-29-Zellkulturmodell die zwei wichtigsten Vertreter der Anthocyanidine, Delphinidin und Cyanidin, untersucht. Es galt zu prüfen, ob beide Pflanzenstoffe in geringen Konzentrationen in humanen Zellen antioxidativ wirken und oxidativen Genomschaden verhindern können. Im Comet-Assay reduzierten sowohl Delphinidin (ab 3,2 µM) als auch Cyanidin (ab 1 µM) signifikant die durch 100 µM Wasserstoffperoxid induzierten DNA-Schäden in den HT-29-Zellen. Im Comet-Assays mit FPG-Enzym wurde deutlich, dass eine Präinkubation mit Cyanidin wirksam die Oxidation der DNA-Basen verringert. Die Auswirkungen auf den Glutathionspiegel wurden mit Hilfe des Glutathion-Recycling-Assays nach Tietze untersucht. Die Präinkubation mit Cyanidin führte hierbei zu keinen signifikanten Veränderungen. Um die Auswirkungen der Anthocyanidine auf die intrazelluläre ROS-Produktion zu beobachten, wurde der fluoreszierenden Farbstoffs DHE verwendet. Sowohl Delphinidin (10 und 15 µM) als auch Cyanidin (10 und 20 µM) senkten signifikant die durch 25 µM Antimycin A angeregte ROS-Produktion.
Im zweiten Teil der Arbeit wurde ein anthocyanreicher roter Fruchtsaft in einer 10-wöchigen Interventionsstudie am Menschen getestet. Hieran nahmen sowohl 19 Fibromyalgiepatienten als auch 10 gesunde Probanden teil. Es sollte die Hypothese geprüft werden, dass die konzentrierte und andauernde Einnahme des Saftes messbar oxidative Stressparameter im Blut verändert. Außerdem sollten mögliche Unterschiede im oxidativen Stresslevel zwischen Patienten und gesunden Probanden aufgedeckt werden. Nach jeder Studienphase erfolgte eine Befragung nach klinischen Symptomen und die Abgabe einer Urin- und Blutprobe in der Schmerzambulanz der Uniklinik Würzburg (2 Wochen Einwaschphase, 4 Wochen Fruchtsaftphase mit je 750 ml Saft täglich, 4 Wochen Auswaschphase). Das ROS-Level wurde mit 2 Methoden in den mononukleären Blutzellen untersucht: In der photometrischen NBT-Messung konnten keine signifikanten Unterschiede zwischen den Gruppen oder Zeitpunkten beobachtet werden. Bei der durchflusszytometrischen Messung mit Hilfe des fluoreszierenden DCF-Farbstoffes lag das ROS-Level der Patientengruppe vor Fruchtsafteinnahme signifikant höher als das der Kontrollgruppe. Zur Messung der antioxidativen Kapazität wurde die Eisen-Reduktionsfähigkeit (FRAP) im Plasma untersucht. In der Patientengruppe zeigte sich eine Steigerung der antioxidativen Kapazität nach Einnahme des Fruchtsaftes. Die Unterschiede zwischen den beiden Gruppen waren gering. Sowohl das Gesamtglutathion als auch die oxidierte und reduzierte Form wurden in den Erythrozyten der Probanden mit dem Glutathion-Recycling-Assay gemessen. Nach der Fruchtsafteinnahme stieg die Konzentration des Gesamtglutathions in der Patientengruppe an.
Zusammenfassend konnte in dieser Arbeit gezeigt werden, dass Delphinidin und Cyanidin auch in geringen Konzentrationen (1µM - 20µM) einen antioxidativer Effekt in HT-29-Zellen haben und vor oxidativem DNA-Schaden schützen können. Die Ergebnisse der Interventionsstudie unterschieden sich teilweise in den einzelnen Endpunkten. Es war nicht möglich, den Fibromyalgiepatienten ein höheres oxidatives Stresslevel nachzuweisen. Ein Grund für die geringeren Effekte des Fruchtsaftes könnte in der eher geringen Bioverfügbarkeit der Anthocyane liegen. Außerdem könnte die Heterogenität der Fibromyalgieerkrankung genauso wie andere endogene oder exogene Faktoren wie etwa Alter oder Medikamenteneinnahme die teilweise großen interindividuellen Schwankungen der Messergebnisse hinsichtlich der oxidativen Stressparameter bedingen. Klinisch profitierten einige der Fibromyalgiepatienten von der Fruchtsafteinnahme insbesondere hinsichtlich der Reizdarmsymptomatik. Dieses Volksleiden könnte ein interessanter Ansatzpunkt für Folgeuntersuchungen mit einem anthocyanreichen Produkt sein.
Übergewicht, das als Volkskrankheit ein wachsendes globales Problem darstellt, ist mit mehreren folgenreichen Komorbiditäten behaftet und die Assoziation der Erkrankung mit nachweisbarer Schädigung des Erbguts durch oxidativen Stress ist mittlerweile unangefochten. In der vorliegenden Studie wurden periphere Lymphozyten stark bis morbid adipöser Patienten mit Hilfe des Mikrokern-Assays untersucht und es konnte – begleitend zu der zu erwartenden BMI-Abnahme – eine signifikante Reduktion des Genomschadens durch Magenbypass bzw. Sleeve-Gastrektomie 12 Monate postoperativ detektiert werden. Daneben demonstrierte die Analyse zusätzlich erhobener Patientendaten, die u. a. Nüchternglucose, HbA1c, Blutdruck und Herzfrequenz sowie ein Blutbild der Patienten (inklusive CRP als Entzündungsmarker, Transaminasen, gGT sowie Lipidprofil) umfasste, eine deutliche Besserung vieler Parameter bis auf teilweise wieder physiologische Normwerte. All diese Ergebnisse stützen die These der metabolischen Wirksamkeit sowohl des Roux-en-Y-Magenbypass als auch der Sleeve- Gastrektomie. Ihre Bedeutung liegt nicht zuletzt in der angenommenen Reduktion des Krebserkrankungsrisikos, da jeweils ein Zusammenhang mit der Adipositas an sich, dem Diabetes und durch oxidativen Stress verursachter DNA-Schädigung besteht. Mit Blick auf eine gegenwärtig in der Forschung diskutierte potentielle therapeutische Anwendung von Antioxidantien zur Reduktion von Erbgutschädigungen, die durch oxidativen Stress zustande kommen, wurden die Substanzen Tricetinidin, Curcumin und Resveratrol im Rahmen des Mikrokerntests an HL60- und NRK-Zellen untersucht, in denen mit der Mischung aus Insulin und Angiotensin II eine gentoxische Wirkung erzielt worden war.