Characterization of different DNA repair pathways in hepatic cells of Zebrafish (Danio rerio).

The concern about DNA damage has directed efforts toward evaluating the genotoxic potential of physical and chemical agents. Since the extent of DNA damage is also related to the capacity of the organism in repairing the DNA, the advance of toxicological studies on this area depends on the characterization of the DNA repair mechanisms in the available models. The cellular zebrafish models, for example, replace mammalian cells to answer ecologically relevant questions on aquatic toxicology. So, the aim of the present study was to characterize the nucleotide excision repair (NER) and photoreactivation (PER) in two cellular models of Danio rerio liver, primary hepatocytes and ZF-L (Zebrafish Liver) cell line. We performed kinetic studies of the DNA damage levels after exposure to 6.8 J/m² UVC using the T4-PDG modified Comet Assay, and determined the expression levels of important genes involved in NER, PER and base excision repair using RT-qPCR. It was observed that both ZF-L cell line and primary hepatocytes exhibit similar NER and PER activity. Primary hepatocytes showed similarities in the gene expression of most of the evaluated repair genes with the original tissue. These results indicate that both primary hepatocytes and ZF-L cells are useful models for toxicological studies aiming to evaluate NER and PER in hepatic cells. Moreover, the similarities in gene expression between the cellular models suggest that the ZF-L cells retain the DNA repair characteristics of the primary hepatocytes and, thus, could serve as replacement to this primary culture, reducing the use of animals in research.

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