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Helga Stopper

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Vinicius Kannen; Helga Stopper; Sérgio Britto Garcia; Ana Maria Waaga-Gasser
Glucagon-like peptide 2 in colon carcinogenesis: Possible target for anti-cancer therapy?
Eman Maher Othman; Paula Anahi Arias-Loza; Franz R Kaiser; Michael C Kreissl; Helga Stopper
Insulin-mediated oxidative stress and DNA damage in LLC-PK1 pig kidney cell line, female rat primary kidney cells, and male ZDF rat kidneys in vivo.
Henning Hintzsche; Christian Jastrow; Uwe Kärst; Thomas Kleine-Ostmann; Martin Koch; Thorsten Schrader; Michael Schwerdtfeger; Mohammed Khaled Shakfa; Kai Baaske; Bernd Heinen; Helga Stopper
Terahertz radiation at 0.380 THz and 2.520 THz does not lead to DNA damage in skin cells in vitro.

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2013: Vinicius Kannen; Helga Stopper; Sérgio Britto Garcia; Ana Maria Waaga-Gasser
Glucagon-like peptide 2 in colon carcinogenesis: Possible target for anti-cancer therapy?
Pharmacology & therapeutics 2013;139(1):87-94.
2013: Eman Maher Othman; Paula Anahi Arias-Loza; Franz R Kaiser; Michael C Kreissl; Helga Stopper
Insulin-mediated oxidative stress and DNA damage in LLC-PK1 pig kidney cell line, female rat primary kidney cells, and male ZDF rat kidneys in vivo.
Endocrinology 2013;154(4):1434-43.
2013: Henning Hintzsche; Christian Jastrow; Uwe Kärst; Thomas Kleine-Ostmann; Martin Koch; Thorsten Schrader; Michael Schwerdtfeger; Mohammed Khaled Shakfa; Kai Baaske; Bernd Heinen; Helga Stopper
Terahertz radiation at 0.380 THz and 2.520 THz does not lead to DNA damage in skin cells in vitro.
Radiation research 2013;179(1):38-45.
2012: Gholamreza Fazeli; Hanjoong Jo; Chih-Wen Ni; Reinhard Schinzel; Helga Stopper; Nicole Schupp
Angiotensin II induces DNA damage via AT1 receptor and NADPH oxidase isoform Nox4.
Mutagenesis 2012;27(6):673-81.
2012: Usama Ramadan Abdelmohsen; Stephanie Grond; Eman Maher Othman; Tanja Schirmeister; Helga Stopper; Matthias Szesny; Ute Hentschel
Antioxidant and anti-protease activities of diazepinomicin from the sponge-associated Micromonospora strain RV115.
Marine drugs 2012;10(10):2208-21.
2012: Henning Hintzsche; Thorsten Riese; Helga Stopper
Hyperthermia-induced micronucleus formation in a human keratinocyte cell line.
Mutation research 2012;738-739():71-4.
2012: Vinicius Kannen; Tassiana Marini; Fernando M Mauad; Wilson Araújo Silva Jr; Helga Stopper; Dalila L Zanette; Jorge Elias Junior; Marcus L Brandão; Milene C Carvalho; Cleverson R Fernandes; Frederico R Ferreira; Sérgio Britto Garcia
High-fat diet causes an imbalance in the colonic serotonergic system promoting adipose tissue enlargement and dysplasia in rats.
Toxicology letters 2012;213(2):135-41.
2012: H Hintzsche; Leo Pfreundner; Buelent Polat; V Schewe; Cholpon S Djuzenova; Michael Flentje; Helga Stopper
Micronucleus formation kinetics in buccal mucosa cells of head and neck cancer patients undergoing radiotherapy.
Toxicology letters 2012;212(1):33-7.
2012: Henning Hintzsche; Christian Jastrow; Thomas Kleine-Ostmann; Thorsten Schrader; Helga Stopper
900 MHz radiation does not induce micronucleus formation in different cell types.
Mutagenesis 2012;27(4):477-83.
2012: Suresh K Abraham; Alexander Eckhardt; Rajaraman G Oli; Helga Stopper
Analysis of in vitro chemoprevention of genotoxic damage by phytochemicals, as single agents or as combinations.
Mutation research 2012;744(2):117-24.
2012: Nina Glaser; Helga Stopper
Patulin: Mechanism of genotoxicity.
Food and chemical toxicology : an international journal published for the British Industrial Biological Research Association 2012;50(5):1796-801.
2012: Vinicius Kannen; Wilson Araújo Silva Jr; Sérgio Britto Garcia; Henning Hintzsche; Ana Maria Waaga-Gasser; Dalila L Zanette; Helga Stopper
Antiproliferative effects of fluoxetine on colon cancer cells and in a colonic carcinogen mouse model.
PloS one 2012;7(11):e50043.
2012: Henning Hintzsche; Christian Jastrow; Uwe Kärst; Thomas Kleine-Ostmann; Thorsten Schrader; Helga Stopper
Terahertz electromagnetic fields (0.106 THz) do not induce manifest genomic damage in vitro.
PloS one 2012;7(9):e46397.
2011: Nina Queisser; Reinhard Schinzel; Nicole Schupp; Helga Stopper; Patricia I Oteiza
Aldosterone increases kidney tubule cell oxidants through calcium-mediated activation of NADPH oxidase and nitric oxide synthase.
Free radical biology & medicine 2011;51(11):1996-2006.
2011: H Hintzsche; C Jastrow; T Kleine-Ostmann; Helga Stopper; E Schmid; T Schrader
Terahertz radiation induces spindle disturbances in human-hamster hybrid cells.
Radiation research 2011;175(5):569-74.
2011: Gholamreza Fazeli; Rajaraman Gnana Oli; Nicole Schupp; Helga Stopper
The role of the dopamine transporter in dopamine-induced DNA damage.
Brain pathology (Zurich, Switzerland) 2011;21(3):237-48.
2011: Nicole Schupp; Peter Kolkhof; Nina Queisser; Sabine Gärtner; Ursula Schmid; Axel Kretschmer; Elke Hartmann; Rajaraman G Oli; Stefan Schäfer; Helga Stopper
Mineralocorticoid receptor-mediated DNA damage in kidneys of DOCA-salt hypertensive rats.
FASEB journal : official publication of the Federation of American Societies for Experimental Biology 2011;25(3):968-78.
2011: Nina Queisser; Patricia I Oteiza; Helga Stopper; Rajaraman G Oli; Nicole Schupp
Aldosterone induces oxidative stress, oxidative DNA damage and NF-κB-activation in kidney tubule cells.
Molecular carcinogenesis 2011;50(2):123-35.
2011: Nicole Schupp; Przemyslaw Rutkowski; Katarína Sebeková; André Klassen; Udo Bahner; Clemens Grupp; August Heidland; Helga Stopper
AT1 receptor antagonist candesartan attenuates genomic damage in peripheral blood lymphocytes of patients on maintenance hemodialysis treatment.
Kidney & blood pressure research 2011;34(3):167-72.
2010: Nicole Schupp; August Heidland; Helga Stopper
Genomic damage in endstage renal disease-contribution of uremic toxins.
Toxins 2010;2(10):2340-58.
2010: Rajaraman Gnana Oli; Gholamreza Fazeli; W Kuhn; Susanne Walitza; Manfred Gerlach; Helga Stopper
No increased chromosomal damage in L-DOPA-treated patients with Parkinson's disease: a pilot study.
Journal of neural transmission (Vienna, Austria : 1996) 2010;117(6):737-46.
2010: Nicole Schupp; N Queisser; M Wolf; P Kolkhof; L Bärfacker; S Schäfer; August Heidland; Helga Stopper
Aldosterone causes DNA strand breaks and chromosomal damage in renal cells, which are prevented by mineralocorticoid receptor antagonists.
Hormone and metabolic research = Hormon- und Stoffwechselforschung = Hormones et métabolisme 2010;42(6):458-65.
2010: Henning Hintzsche; Helga Stopper
Micronucleus frequency in buccal mucosa cells of mobile phone users.
Toxicology letters 2010;193(1):124-30.
2010: Susanne Walitza; Kristina Kämpf; Rajaraman Gnana Oli; Andreas Warnke; Manfred Gerlach; Helga Stopper
Prospective follow-up studies found no chromosomal mutagenicity of methylphenidate therapy in ADHD affected children.
Toxicology letters 2010;193(1):4-8.
2009: Andreas Brink; Ingrid Richter; Ursula Lutz; Paul Wanek; Helga Stopper; Werner K Lutz
Biological significance of DNA adducts: comparison of increments over background for various biomarkers of genotoxicity in L5178Y tk(+/-) mouse lymphoma cells treated with hydrogen peroxide and cumene hydroperoxide.
Mutation research 2009;678(2):123-8.
2009: Helga Stopper; Nicole Schupp; Gholamreza Fazeli; Barbara Dietel; Nina Queisser; Susanne Walitza; Manfred Gerlach
Genotoxicity of the neurotransmitter dopamine in vitro.
Toxicology in vitro : an international journal published in association with BIBRA 2009;23(4):640-6.
2008: August Heidland; Helga Stopper; Nicole Schupp; L Paczek; André Klassen; Katarína Sebeková
[Effects of proteolytic enzymes on advanced glycation end-products (AGEs): possible clinical implications].
Deutsche medizinische Wochenschrift (1946) 2008;133 Suppl 9():S313-5.
2008: Ursula Schmid; Helga Stopper; Frank Schweda; Nina Queisser; Nicole Schupp
Angiotensin II induces DNA damage in the kidney.
Cancer research 2008;68(22):9239-46.
2008: Helga Stopper; Anna-Teresa Treutlein; Udo Bahner; Nicole Schupp; Ursula Schmid; Andreas Brink; Alessandra Perna; August Heidland
Reduction of the genomic damage level in haemodialysis patients by folic acid and vitamin B12 supplementation.
Nephrology, dialysis, transplantation : official publication of the European Dialysis and Transplant Association - European Renal Association 2008;23(10):3272-9.
2008: Nicole Schupp; Eva Maria Dette; Ursula Schmid; Udo Bahner; Michaela Winkler; August Heidland; Helga Stopper
Benfotiamine reduces genomic damage in peripheral lymphocytes of hemodialysis patients.
Naunyn-Schmiedeberg's archives of pharmacology 2008;378(3):283-91.
2008: Nicole Schupp; Ursula Schmid; August Heidland; Helga Stopper
Rosuvastatin protects against oxidative stress and DNA damage in vitro via upregulation of glutathione synthesis.
Atherosclerosis 2008;199(2):278-87.
2008: Ursula Schmid; Helga Stopper; August Heidland; Nicole Schupp
Benfotiamine exhibits direct antioxidative capacity and prevents induction of DNA damage in vitro.
Diabetes/metabolism research and reviews 2008;24(5):371-7.
2008: Tzutzuy Ramirez; Jan Brocher; Helga Stopper; Robert Hock
Sodium arsenite modulates histone acetylation, histone deacetylase activity and HMGN protein dynamics in human cells.
Chromosoma 2008;117(2):147-57.
2008: Nicole Schupp; Ursula Schmid; August Heidland; Helga Stopper
New approaches for the treatment of genomic damage in end-stage renal disease.
Journal of renal nutrition : the official journal of the Council on Renal Nutrition of the National Kidney Foundation 2008;18(1):127-33.
2008: Helga Stopper; Susanne Walitza; Andreas Warnke; Manfred Gerlach
Brief review of available evidence concerning the potential induction of genomic damage by methylphenidate.
Journal of neural transmission (Vienna, Austria : 1996) 2008;115(2):331-4.
2008: Tzutzuy Ramírez; Helga Stopper; Thomas Fischer; Robert Hock; lucy Tapia
S-adenosyl-L-methionine counteracts mitotic disturbances and cytostatic effects induced by sodium arsenite in HeLa cells.
Mutation research 2008;637(1-2):152-60.
2007: K Fink; A Brink; Joerg Hans Vienken; August Heidland; Helga Stopper
Homocysteine exerts genotoxic and antioxidative effects in vitro.
Toxicology in vitro : an international journal published in association with BIBRA 2007;21(8):1402-8.
2007: Andreas Brink; Berta Schulz; Helga Stopper; Werner K Lutz
Biological significance of DNA adducts investigated by simultaneous analysis of different endpoints of genotoxicity in L5178Y mouse lymphoma cells treated with methyl methanesulfonate.
Mutation research 2007;625(1-2):94-101.
2007: Suresh K Abraham; Nicole Schupp; Ursula Schmid; Helga Stopper
Antigenotoxic effects of the phytoestrogen pelargonidin chloride and the polyphenol chlorogenic acid.
Molecular nutrition & food research 2007;51(7):880-7.
2007: Susanne Walitza; Birgit Werner; Marcel Romanos; Andreas Warnke; Manfred Gerlach; Helga Stopper
Does methylphenidate cause a cytogenetic effect in children with attention deficit hyperactivity disorder?
Environmental health perspectives 2007;115(6):936-40.
2007: Nicole Schupp; Ursula Schmid; Przemyslaw Rutkowski; Ursula Lakner; Nilesh Kanase; August Heidland; Helga Stopper
Angiotensin II-induced genomic damage in renal cells can be prevented by angiotensin II type 1 receptor blockage or radical scavenging.
American journal of physiology. Renal physiology 2007;292(5):F1427-34.
2006: Regina Ebert; Matthias Ulmer; Sabine Zeck; Jutta Meissner-Weigl; Doris Schneider; Helga Stopper; Nicole Schupp; Moustapha Kassem; Franz Jakob
Selenium supplementation restores the antioxidative capacity and prevents cell damage in bone marrow stromal cells in vitro.
Stem cells (Dayton, Ohio) 2006;24(5):1226-35.
2006: Andreas Brink; Berta Schulz; Kristin Kobras; Werner K Lutz; Helga Stopper
Time-dependent effects of sodium arsenite on DNA breakage and apoptosis observed in the comet assay.
Mutation research 2006;603(2):121-8.
2006: Kristin Kobras; Nicole Schupp; K Nehrlich; M Adelhardt; Udo Bahner; Joerg Hans Vienken; August Heidland; Katarina Sebekova; Helga Stopper
Relation between different treatment modalities and genomic damage of end-stage renal failure patients.
Kidney & blood pressure research 2006;29(1):10-7.
2006: Nicole Schupp; Helga Stopper; Przemyslaw Rutkowski; Kristin Kobras; Michael Nebel; Udo Bahner; Joerg Hans Vienken; August Heidland
Effect of different hemodialysis regimens on genomic damage in end-stage renal failure.
Seminars in nephrology 2006;26(1):28-32.
2005: Evangelia Fragedaki; Michael Nebel; Nicole Schupp; Katarina Sebekova; Wolfgang Völkel; André Klassen; Monika Pischetsrieder; Matthias Frischmann; Toshimitsu Niwa; Joerg Hans Vienken; August Heidland; Helga Stopper
Genomic damage and circulating AGE levels in patients undergoing daily versus standard haemodialysis.
Nephrology, dialysis, transplantation : official publication of the European Dialysis and Transplant Association - European Renal Association 2005;20(9):1936-43.
2005: Marianne Möller; Waldemar Adam; Stefan Marquardt; Chantu R Saha-Möller; Helga Stopper
Cytotoxicity and genotoxicity induced by the photochemical alkoxyl radical source N-tert-butoxypyridine-2-thione in L5178Y mouse lymphoma cells under UVA irradiation.
Free radical biology & medicine 2005;39(4):473-82.
2005: Werner K Lutz; Oliver Tiedge; Roman W Lutz; Helga Stopper
Different types of combination effects for the induction of micronuclei in mouse lymphoma cells by binary mixtures of the genotoxic agents MMS, MNU, and genistein.
Toxicological sciences : an official journal of the Society of Toxicology 2005;86(2):318-23.
2005: Helga Stopper; Elmar Schmitt; Kristin Kobras
Genotoxicity of phytoestrogens.
Mutation research 2005;574(1-2):139-55.
2005: Nicole Schupp; Reinhard Schinzel; August Heidland; Helga Stopper
Genotoxicity of advanced glycation end products: involvement of oxidative stress and of angiotensin II type 1 receptors.
Annals of the New York Academy of Sciences 2005;1043():685-95.
2005: Jan Grawé; Johannes Biko; Reinhard Lorenz; Christoph Reiners; Helga Stopper; Stanislav Vershenya; Vladimir Vukicevic; Klaus Hempel
Evaluation of the reticulocyte micronucleus assay in patients treated with radioiodine for thyroid cancer.
Mutation research 2005;583(1):12-25.
2005: Helga Stopper; Klaus Hempel; Christoph Reiners; Stanislav Vershenya; Reinhard Lorenz; Vladimir Vukicevic; August Heidland; J Grawe
Pilot study for comparison of reticulocyte-micronulei with lymphocyte-micronuclei in human biomonitoring.
Toxicology letters 2005;156(3):351-60.
2005: Xiaohong Zhang; Matthias Frischmann; Rosemarie Kientsch-Engel; Katharina Steinmann; Helga Stopper; Toshimitsu Niwa; Monika Pischetsrieder
Two immunochemical assays to measure advanced glycation end-products in serum from dialysis patients.
Clinical chemistry and laboratory medicine : CCLM / FESCC 2005;43(5):503-11.
2005: Helga Stopper; Nicole Schupp; André Klassen; Katarina Sebekova; August Heidland
Genomic damage in chronic renal failure--potential therapeutic interventions.
Journal of renal nutrition : the official journal of the Council on Renal Nutrition of the National Kidney Foundation 2005;15(1):81-6.
2004: Helga Stopper; Nicole Schupp; Udo Bahner; Katarina Sebekova; André Klassen; August Heidland
Genomic damage in end-stage renal failure: potential involvement of advanced glycation end products and carbonyl stress.
Seminars in nephrology 2004;24(5):474-8.
2004: Suresh K Abraham; Helga Stopper
Anti-genotoxicity of coffee against N-methyl-N-nitro-N-nitrosoguanidine in mouse lymphoma cells.
Mutation research 2004;561(1-2):23-33.
2004: Suresh K Abraham; Vladimir Vukicevic; Helga Stopper
Coffee-mediated protective effects against directly acting genotoxins and gamma-radiation in mouse lymphoma cells.
Cell biology and toxicology 2004;20(2):121-32.
2004: Vladimir Vukicevic; Katja Kampfinger; Helga Stopper
Influence of altered apoptosis in human lymphoblastoid cell lines on micronucleus frequency.
Toxicology letters 2004;147(2):187-95.
2003: Elmar Schmitt; Manfred Metzler; Rene Jonas; Wolfgang Dekant; Helga Stopper
Genotoxic activity of four metabolites of the soy isoflavone daidzein.
Mutation research 2003;542(1-2):43-8.
2003: Helga Stopper; Elmar Schmitt; Caroline Gregor; Stefan O Mueller; Wolfgang H Fischer
Increased cell proliferation is associated with genomic instability: elevated micronuclei frequencies in estradiol-treated human ovarian cancer cells.
Mutagenesis 2003;18(3):243-7.
2003: Helga Stopper; Reinhard Schinzel; Katarina Sebekova; August Heidland
Genotoxicity of advanced glycation end products in mammalian cells.
Cancer letters 2003;190(2):151-6.
2002: Elmar Schmitt; L Lehmann; M Metzler; Helga Stopper
Hormonal and genotoxic activity of resveratrol.
Toxicology letters 2002;136(2):133-42.
2002: Werner K Lutz; Spyros Vamvakas; Annette Kopp-Schneider; Josef Schlatter; Helga Stopper
Deviation from additivity in mixture toxicity: relevance of nonlinear dose-response relationships and cell line differences in genotoxicity assays with combinations of chemical mutagens and gamma-radiation.
Environmental health perspectives 2002;110 Suppl 6():915-8.
2002: Markus Teschner; C Garte; H Rückle-Lanz; U Mäder; Helga Stopper; André Klassen; August Heidland
[Incidence and spectrum of malignant disease among dialysis patients in North Bavaria].
Deutsche medizinische Wochenschrift (1946) 2002;127(47):2497-502.
2002: Marianne Möller; Waldemar Adam; Chantu R Saha-Möller; Helga Stopper
Studies on cytotoxic and genotoxic effects of N-hydroxypyridine-2-thione (Omadine) in L5178Y mouse lymphoma cells.
Toxicology letters 2002;136(1):77-84.
2002: Ulrich Oppitz; S Schulte; Helga Stopper; Kurt Baier; M Müller; Jörn Wulf; R Schakowski; Michael Flentje
In vitro radiosensitivity measured in lymphocytes and fibroblasts by colony formation and comet assay: comparison with clinical acute reactions to radiotherapy in breast cancer patients.
International journal of radiation biology 2002;78(7):611-6.
2002: Helga Stopper; Werner K Lutz
Induction of micronuclei in human cell lines and primary cells by combination treatment with gamma-radiation and ethyl methanesulfonate.
Mutagenesis 2002;17(2):177-81.
2001: Elmar Schmitt; Wolfgang Dekant; Helga Stopper
Assaying the estrogenicity of phytoestrogens in cells of different estrogen sensitive tissues.
Toxicology in vitro : an international journal published in association with BIBRA 2001;15(4-5):433-9.
2001: Helga Stopper; F Boullay; August Heidland; Joerg Hans Vienken; Udo Bahner
Comet-assay analysis identifies genomic damage in lymphocytes of uremic patients.
American journal of kidney diseases : the official journal of the National Kidney Foundation 2001;38(2):296-301.
2001: Wolfgang H Fischer; A Keiwan; Elmar Schmitt; Helga Stopper
Increased formation of micronuclei after hormonal stimulation of cell proliferation in human breast cancer cells.
Mutagenesis 2001;16(3):209-12.
2001: G Boos; Helga Stopper
DNA methylation influences the decatenation activity of topoisomerase II.
International journal of biological macromolecules 2001;28(2):103-6.
2001: Elmar Schmitt; Helga Stopper
Estrogenic activity of naturally occurring anthocyanidins.
Nutrition and cancer 2001;41(1-2):145-9.
2000: Martin Fein; Karl-Hermann Fuchs; Helga Stopper; Stefanie Diem; Markus Herderich
Duodenogastric reflux and foregut carcinogenesis: analysis of duodenal juice in a rodent model of cancer.
Carcinogenesis 2000;21(11):2079-84.
2000: G Boos; Helga Stopper
Genotoxicity of several clinically used topoisomerase II inhibitors.
Toxicology letters 2000;116(1-2):7-16.
2000: Helga Stopper; Stefan O Mueller; Werner K Lutz
Supra-additive genotoxicity of a combination of gamma-irradiation and ethyl methanesulfonate in mouse lymphoma L5178Y cells.
Mutagenesis 2000;15(3):235-8.
2000: Bernd Schmausser; Stefan O Mueller; Matthias Eck; Marianne Möller; H Müller-Hermelink; Helga Stopper
Helicobacter pylori induces DNA damage in vitro.
Cancer letters 2000;152(2):145-9.
2000: Verena Preisler; WJ Caspary; Florian Hoppe; Rudolf Hagen; Helga Stopper
Aflatoxin B1-induced mitotic recombination in L5178Y mouse lymphoma cells.
Mutagenesis 2000;15(1):91-7.
1999: Verena Preisler; D Wück; Helga Stopper
Combination of paclitaxel and radiation: genotoxicity in vitro in four mammalian cell lines.
Cancer letters 1999;145(1-2):29-33.
1999: Helga Stopper; T Meysen; A Böckenförde; Udo Bahner; August Heidland; Spyros Vamvakas
Increased genomic damage in lymphocytes of patients before and after long-term maintenance hemodialysis therapy.
American journal of kidney diseases : the official journal of the National Kidney Foundation 1999;34(3):433-7.
1999: Stefan O Mueller; Helga Stopper
Characterization of the genotoxicity of anthraquinones in mammalian cells.
Biochimica et biophysica acta 1999;1428(2-3):406-14.
1999: Ulrich Oppitz; S Denzinger; U Nachtrab; Michael Flentje; Helga Stopper
Radiation-induced comet-formation in human skin fibroblasts from radiotherapy patients with different normal tissue reactions.
Strahlentherapie und Onkologie : Organ der Deutschen Röntgengesellschaft ... [et al] 1999;175(7):341-6.
1999: Cholpon S Djuzenova; Detlev Schindler; Helga Stopper; Holger Hoehn; Michael Flentje; Ulrich Oppitz
Identification of ataxia telangiectasia heterozygotes, a cancer-prone population, using the single-cell gel electrophoresis (Comet) assay.
Laboratory investigation; a journal of technical methods and pathology 1999;79(6):699-705.
1999: Helga Stopper; Marianne Möller; Heike Bömmel; Harald Schmidt
Cytotoxic versus genotoxic effects of nitric oxide (NO).
Toxicology letters 1999;106(1):59-67.
1999: Stefan O Mueller; M Schmitt; Wolfgang Dekant; Helga Stopper; Josef Schlatter; Peter Schreier; Werner K Lutz
Occurrence of emodin, chrysophanol and physcion in vegetables, herbs and liquors. Genotoxicity and anti-genotoxicity of the anthraquinones and of the whole plants.
Food and chemical toxicology : an international journal published for the British Industrial Biological Research Association 1999;37(5):481-91.
1999: Alla A Kyagova; ES Andina; N N Zhuravel; EP Lysenko; M Möller; Helga Stopper; W Adam; Chantu R Saha-Möller
Photohemolysis sensitized by the furocoumarin imperatorin and its oxyfunctionalized derivatives.
Photochemistry and photobiology 1999;69(4):410-20.
1999: Helga Stopper; G Boos; M Clark; Frank Gieseler
Are topoisomerase II inhibitor-induced micronuclei in vitro a predictive marker for the compounds' ability to cause secondary leukemias after treatment?
Toxicology letters 1999;104(1-2):103-10.
1998: Verena Preisler; Helga Stopper; Detlev Schindler; Richard Friedl; Leo Pfreundner; Florian Hoppe; Rudolf Hagen
Cytotoxic and genotoxic effects of paclitaxel (Taxol) and radiation in a squamous cell carcinoma cell line of the larynx.
Acta oto-laryngologica 1998;118(4):600-5.
1998: Stefan O Mueller; Helga Stopper; Wolfgang Dekant
Biotransformation of the anthraquinones emodin and chrysophanol by cytochrome P450 enzymes. Bioactivation to genotoxic metabolites.
Drug metabolism and disposition: the biological fate of chemicals 1998;26(6):540-6.
1998: S O Müeller; Werner K Lutz; Helga Stopper
Factors affecting the genotoxic potency ranking of natural anthraquinones in mammalian cell culture systems.
Mutation research 1998;414(1-3):125-9.
1998: U Nachtrab; Ulrich Oppitz; Michael Flentje; Helga Stopper
Radiation-induced micronucleus formation in human skin fibroblasts of patients showing severe and normal tissue damage after radiotherapy.
International journal of radiation biology 1998;73(3):279-87.
1997: Helga Stopper; S O Müller
Micronuclei as a biological endpoint for genotoxicity: A minireview.
Toxicology in vitro : an international journal published in association with BIBRA 1997;11(5):661-7.
1997: I Eckert; WJ Caspary; M Nüsse; MC Liechty; L Davis; Helga Stopper
Micronuclei containing whole chromosomes harbouring the selectable gene do not lead to mutagenesis.
Mutagenesis 1997;12(5):379-82.
1997: Waldemar Adam; K Mielke; Chantu R Saha-Möller; M Möller; Helga Stopper; R Hutterer; FW Schneider; Daniel Ballmaier; Bernd Epe; F F Gasparro; X Chen; J Kagan
Photochemical and photobiological studies of a furonaphthopyranone as a benzo-spaced psoralen analog in cell-free and cellular DNA.
Photochemistry and photobiology 1997;66(1):46-54.
1997: Helga Stopper; M Full; R Helbig; Günter Speit
Micronucleus induction by neocarzinostatin and methyl methanesulfonate in ionizing radiation--sensitive Chinese hamster V79 cell mutants.
Mutation research 1997;383(2):107-12.
1997: Helga Stopper; I Eckert; P Wagener; W A Schulz
Formation of micronuclei and inhibition of topoisomerase II in the comet assay in mammalian cells with altered DNA methylation.
Recent results in cancer research. Fortschritte der Krebsforschung. Progrès dans les recherches sur le cancer 1997;143():183-93.
1997: WJ Caspary; Helga Stopper; John Hozier; MC Liechty; LM Davis
Mechanisms leading to the expression of recessive alleles: the use of polymorphic microsatellites and whole-chromosome painting probes to analyze mouse tumors, mutants, and micronuclei.
Recent results in cancer research. Fortschritte der Krebsforschung. Progrès dans les recherches sur le cancer 1997;143():161-82.
1997: Waldemar Adam; S Andler; Daniel Ballmaier; Steffen Emmert; Bernd Epe; GN Grimm; K Mielke; M Möller; Thomas M. Ruenger; Chantu R Saha-Möller; A Schönberger; Helga Stopper
Oxidative DNA damage induced by dioxetanes, photosensitizing ketones, and photo-fenton reagents.
Recent results in cancer research. Fortschritte der Krebsforschung. Progrès dans les recherches sur le cancer 1997;143():21-34.
1996: S O Müller; I Eckert; Werner K Lutz; Helga Stopper
Genotoxicity of the laxative drug components emodin, aloe-emodin and danthron in mammalian cells: topoisomerase II mediated?
Mutation research 1996;371(3-4):165-73.
1996: I Eckert; Helga Stopper
genotoxic effects induced by beta-oestradiol in vitro.
Toxicology in vitro : an international journal published in association with BIBRA 1996;10(5):637-42.
1995: M Möller; Helga Stopper; M Häring; Y Schleger; Bernd Epe; Waldemar Adam; Chantu R Saha-Möller
Genotoxicity induced by furocoumarin hydroperoxides in mammalian cells upon UVA irradiation.
Biochemical and biophysical research communications 1995;216(2):693-701.
1995: R D Combes; Helga Stopper; WJ Caspary
The use of L5178Y mouse lymphoma cells to assess the mutagenic, clastogenic and aneugenic properties of chemicals.
Mutagenesis 1995;10(5):403-8.
1995: S Kirchner; D Schiffmann; Helga Stopper
The influence of DNA methylation on topoisomerase II activity and its possible link with genomic instability in different cell lines of the syrian hamster.
Toxicology in vitro : an international journal published in association with BIBRA 1995;9(4):519-25.
1995: Helga Stopper; C Körber; P Gibis; D L Spencer; WJ Caspary
Micronuclei induced by modulators of methylation: analogs of 5-azacytidine.
Carcinogenesis 1995;16(7):1647-50.
1995: P Tas; S Ambs; Helga Stopper; K Koschel; D Schiffmann
Role of extracellular calcium and calcium stores in the intracellular calcium rise induced by diethylstilboestrol in C6 rat glioma cells.
Toxicology in vitro : an international journal published in association with BIBRA 1995;9(2):117-21.
1995: Elke Dopp; J Saedler; Helga Stopper; Dieter Weiss; Dietmar Schiffmann
Mitotic disturbances and micronucleus induction in Syrian hamster embryo fibroblast cells caused by asbestos fibers.
Environmental health perspectives 1995;103(3):268-71.
1994: Helga Stopper; A Kühnel; B Podschun
Combination of the chemotherapeutic agent 5-fluorouracil with an inhibitor of its catabolism results in increased micronucleus induction.
Biochemical and biophysical research communications 1994;203(2):1124-30.
1994: Helga Stopper; I Eckert; Dietmar Schiffmann; D L Spencer; WJ Caspary
Is micronucleus induction by aneugens an early event leading to mutagenesis?
Mutagenesis 1994;9(5):411-6.
1994: Helga Stopper; S Kirchner; Dietmar Schiffmann; M Poot
Cell cycle disturbance in relation to micronucleus formation induced by the carcinogenic estrogen diethylstilbestrol.
Pathobiology : journal of immunopathology, molecular and cellular biology 1994;62(4):180-5.
1993: Bernd Epe; M Häring; D Ramaiah; Helga Stopper; M M Abou-Elzahab; Waldemar Adam; Chantu R Saha-Möller
DNA damage induced by furocoumarin hydroperoxides plus UV (360 nm).
Carcinogenesis 1993;14(11):2271-6.
1993: Helga Stopper; C Körber; D L Spencer; S Kirchner; WJ Caspary; Dietmar Schiffmann
An investigation of micronucleus and mutation induction by oxazepam in mammalian cells.
Mutagenesis 1993;8(5):449-55.
1993: Helga Stopper; C Körber; Dietmar Schiffmann; WJ Caspary
Cell-cycle dependent micronucleus formation and mitotic disturbances induced by 5-azacytidine in mammalian cells.
Mutation research 1993;300(3-4):165-77.
1993: Waldemar Adam; M Ahrweiler; Chantu R Saha-Möller; M Sauter; A Schönberger; Bernd Epe; E Müller; Dietmar Schiffmann; Helga Stopper; D Wild
Genotoxicity studies of benzofuran dioxetanes and epoxides with isolated DNA, bacteria and mammalian cells.
Toxicology letters 1993;67(1-3):41-55.
1993: S Kirchner; Helga Stopper; Thilo Papp; I Eckert; H J Yoo; Baldev K Vig; Dietmar Schiffmann
Cytogenetic changes in primary, immortalized and malignant mammalian cells.
Toxicology letters 1993;67(1-3):283-95.
1993: J Janevski; V Choh; Helga Stopper; Dietmar Schiffmann; Umberto De Boni
Diethylstilbestrol alters the morphology and calcium levels of growth cones of PC12 cells in vitro.
Neurotoxicology 1993;14(4):505-11.
1992: Helga Stopper; R Pechan; Dietmar Schiffmann
5-azacytidine induces micronuclei in and morphological transformation of Syrian hamster embryo fibroblasts in the absence of unscheduled DNA synthesis.
Mutation research 1992;283(1):21-8.
1991: Helga Stopper; M Metzler
Carcinogenic oestrogens induce respiration deficiency mutation in yeast.
Toxicology in vitro : an international journal published in association with BIBRA 1991;5(5-6):487-91.
1991: P Tas; Helga Stopper; K Koschel; Dietmar Schiffmann
Influence of the carcinogenic oestrogen diethylstilboestrol on the intracellular calcium level in C6 rat glioma cells.
Toxicology in vitro : an international journal published in association with BIBRA 1991;5(5-6):463-5.
1990: Bernd Epe; U Harttig; Helga Stopper; M Metzler
Covalent binding of reactive estrogen metabolites to microtubular protein as a possible mechanism of aneuploidy induction and neoplastic cell transformation.
Environmental health perspectives 1990;88():123-7.
1988: Helga Stopper; Ulrich Zimmermann; Garry Neil
Increased efficiency of transfection of murine hybridoma cells with DNA by electropermeabilization.
Journal of immunological methods 1988;109(1):145-51.