Co-exposure to environmental carcinogens in vivo induces neoplasia-related hallmarks in low-genotoxicity events, even after removal of insult

Scientific Reports
Marta MartinsPedro M Costa

Abstract

Addressing the risk of mixed carcinogens in vivo under environmentally-realistic scenarios is still a challenge. Searching for adequate biomarkers of exposure requires understanding molecular pathways and their connection with neoplasia-related benchmark pathologies. Subjecting the zebrafish model to realistic concentrations of two genotoxicants and carcinogens, cadmium and benzo[a]pyrene, isolated and combined, yielded low levels of DNA damage. Altogether, the organisms' mechanisms of DNA repair, oxidative stress and phases I and II were not overwhelmed after two weeks of treatment. Still, transcriptional responses related to detoxification (epoxide hydrolase and UDP-glucuronosyltransferase) were higher in animals subjected to the combination treatment, inclusively following depuration. Nonetheless, inflammation and formation of hyperplasic foci in fish epithelia were more severe in animals exposed to the combined substances, showing slower recovery during depuration. Additionally, the combination treatment yielded unexpected increased expression of a ras-family oncogene homologue after depuration, with evidence for increased tp53 counter-response in the same period. The findings indicate that oncogene expression, cell prolife...Continue Reading

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Citations

Aug 25, 2020·Reviews on Environmental Health·William H GoodsonDavid O Carpenter
Feb 7, 2021·International Journal of Environmental Research and Public Health·Neusa FigueiredoMarta Martins
Sep 24, 2020·Ecotoxicology and Environmental Safety·Samara Silva de SouzaVera Maria Fonseca de Almeida-Val
Nov 9, 2020·Comparative Biochemistry and Physiology. Toxicology & Pharmacology : CBP·Yongzhan MaiZini Lai

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Methods Mentioned

BETA
transgenic
electrophoresis
PCR
fluorescence microscopy

Software Mentioned

LightCycler 480
CometScore
Statistica

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