کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8456212 | 1548543 | 2018 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Impact of DNA polymerase ζ mutations on genotoxic thresholds of oxidative mutagens
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کلمات کلیدی
PBSKBrO38-oxo-dGDSBsSCETLS5-bromo-2′-deoxyuridine - 5-bromo-2'-deoxyuridine7,8-dihydro-8-oxo-2′-deoxyguanosine - 7،8-دی هیدرو-8-اکسو-2'-دگزسی گوانوزینBrdU - بروموداکسی اوریدینSister-chromatid exchange - تبادل خواهر کروماتیدOxidative stress - تنش اکسیداتیوthymidine kinase - تیمیدین کینازSodium dichromate - دی کرومات سدیمDNA polymerase - دیانای پلی مراز، DNA پلیمرازGenotoxicity - سمیت ژنتیکیtranslesion DNA synthesis - سنتز DNA ترجمه شدهdouble-strand breaks - شکست دو ردیفPhosphate-buffered saline - محلول نمک فسفات با خاصیت بافریMicronucleus - میکروسکوپwild-type - نوع وحشیPotassium bromate - پتاسیم بروماتpol - پل
موضوعات مرتبط
علوم زیستی و بیوفناوری
بیوشیمی، ژنتیک و زیست شناسی مولکولی
تحقیقات سرطان
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
In regulatory genetic toxicology, it is an axiom that there is no threshold for genotoxicity of chemicals, such that genotoxic chemicals may impose carcinogenic risk on humans even at very low doses. This paradigm is counterintuitive, however, because humans possess a number of self-defense mechanisms that may suppress the genotoxicity at these low doses and therefore manifest a practical threshold. DNA polymerase zeta (Pol ζ) is a specialized Pol that plays an important role in DNA synthesis across DNA damage, thereby modulating cell survival and genotoxicity. In this study, we compared the sensitivity of three types of human cells: D2781N, L2618M, and their wild-type (WT) cells, to the low dose effects of genotoxicity of the oxidizing agents, potassium bromate (KBrO3) and sodium dichromate (Na2Cr2O7). D2781N cells express a variant form of Pol ζ, whose activity is weaker than that of the WT enzyme. L2618M cells express another variant form of Pol ζ, whose fidelity of DNA replication is lower than that of the WT enzyme. D2781N exhibited the highest sensitivity for TK gene mutation and micronucleus (MN) formation and displayed the lowest practical threshold for MN induction by KBrO3. In contrast, L2618M exhibited the lowest practical threshold for sister-chromatid exchange (SCE) induction by both chemicals. These results suggest that Pol ζ mutations have significant impacts on practical thresholds of genotoxicity; the factors affecting the practical threshold can differ depending on the endpoint of genotoxicity. Roles of the variant forms of Pol ζ in genotoxicity by the oxidizing agents are discussed.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Mutation Research/Genetic Toxicology and Environmental Mutagenesis - Volume 828, April 2018, Pages 10-14
Journal: Mutation Research/Genetic Toxicology and Environmental Mutagenesis - Volume 828, April 2018, Pages 10-14
نویسندگان
Tetsuya Suzuki, Kyomu Matsumoto, Masamitsu Honma, Takehiko Nohmi,