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Beauvericin alters the expression of genes coding for key proteins of the mitochondrial chain in ovine cumulus-oocyte complexes

机译:Beauvericin改变了在绵羊卵卵卵母细胞配合物中编码了对线粒体链的关键蛋白的基因的表达

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Beauvericin (BEA) is a member of the enniatin family of mycotoxins which has received increasing interest because of frequent occurrence in food and feed. By its ionophoric properties, BEA is able to alter membrane ion permeability uncoupling oxidative phosphorylation. It was also shown to alter oocyte mitochondrial function. In this study, the effects of BEA at 0.5, 1, ,3 and 5 mu mol/L on expression of genes coding for key proteins of the mitochondrial chain in ovine oocytes and cumulus cells were evaluated at different time points of in vitro maturation (IVM), germinal vesicle (GV;t= 0), metaphase I (MI;t= 7 h), and metaphase II (MII;t= 24 h). The expression of nuclear (TFAM,NDUFA12,UQCRH,COX4,ATP5O) and mitochondrial (ND1,COX1,COX2,ATP6,ATP8) genes coding for proteins of Complexes I, III, IV, and V was analyzed by qRT-PCR. After BEA exposure, perturbed expression of all genes was observed in cumulus cells and in oocytes at the MI stage (7 h IVM). Expression ofND1,UQCRH,COX4andATP5Owas downregulated in cumulus cells and upregulated in oocytes starting from 0.5 mu mol/L BEA. Expression ofTFAM,NDUFA12,COX1,COX2,ATP6, andATP8was upregulated starting from 1 mu mol/L in cumulus cells and from 3 mu mol/L in oocytes. Cumulus cells and oocytes displayed different gene expression patterns upon BEA exposure. The downregulation in cumulus cells of four genes coding for proteins of mitochondrial complexes could represent a major toxic event induced by BEA on the cumulus-oocyte complex which may result in mitochondrial functional alteration.
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