Show simple item record Sandrini, Juliana Zomer Trindade, Gilma Santos Nery, Luiz Eduardo Maia Marins, Luis Fernando Fernandes 2011-05-17T22:29:10Z 2011-05-17T22:29:10Z 2009
dc.identifier.citation SANDRINI, Juliana Z. et. al. Time-course Expression of DNA Repair-related Genes in Hepatocytes of Zebrafish ( ) After UV-B Exposure. Photochemistry and Photobiology, v. 85, n. 1, p. 220-226, 2009. Disponível em: <>. Acesso em: 17 abr. 2011. pt_BR
dc.identifier.issn 1011-1344
dc.description.abstract The objective of this study was to evaluate the time-course effects of UV-B exposure on expression of genes involved in the DNA repair system of zebrafish (Danio rerio)hepatocytes, a highly competent species in terms of damage repair induced by UV radiation. For gene expression analysis (RT-PCR), cells were exposed to 23.3 mJ cm)2 UV-B, which was the dose that affected viable cell number (reduction of 30% when compared with the control group) and produced no visual alteration on cell morphology. The early response observed(6h) showed induction in the expression of the CDKI gene (cyclin-dependent kinase inhibitor) and genes related to DNA damage repair (mainly XPC and DDB2), while the late response observed(24 h) was more related to up-regulation of p53 and genes involved in cell cycle arrest (gadd45a, cyclinG1). In all times analyzed, the antiapoptotic gene Bcl-2 was down-regulated. Another interesting result observed was the up-regulation of the Apex-1 gene after UV-B exposure, which could indicate the induction of oxidative lesions in the DNA molecule. In conclusion, these results demonstrate an activation of the DNA repair system in hepatocytes of zebrafish exposed to UV-B radiation, mainly involving the participation of p53. pt_BR
dc.language.iso eng pt_BR
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dc.subject DNA pt_BR
dc.subject Genes pt_BR
dc.subject Hepatocytes pt_BR
dc.subject UV-B pt_BR
dc.title Time-course Expression of DNA Repair-related Genes in Hepatocytes of Zebrafish (Danio rerio) After UV-B Exposure pt_BR
dc.type article pt_BR

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