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Mitochondrial transcription factor A (TFAM) is increased in rat embryo during placentation and associated with mitochondrial differentiation

机译:线粒体转录因子A(TFAM)在胎盘形成过程中在大鼠胚胎中增加,并与线粒体分化有关

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In the current study, the mitochondrial proliferation-differentiation process was investigated in rat embryo during the placentation process, straight after organogenesis, when there is an important oxidative metabolism activation. For this purpose, on gestational days 11, 12 and 13 we studied the mitochondrial DNA (mtDNA) content and the relative gene expression of proteins involved in mtDNA replication (mitochondrial single strand DNA binding protein (mtSSB)), mtDNA transcription (mitochondrial transcription factor A (TFAM)), as well as in mitochondrial function (cytochrome c oxidase subunit I (COXI)). The results indicated that during placentation important changes in mitochondrial proliferation-differentiation process take place in rat embryo. There is a great decrease in cellular mtDNA content and a rise in the ratio between TFAM and mtDNA accompanied by an increase in COXI gene expression. Thus, we can conclude that on gestational day 13 mitochondrial differentiation predominates over mitochondrial proliferation in embryo cells. Besides, our work reveals that in a physiological condition such as embryonic development the TFAM levels change in order to regulate the transcriptional activity of mtDNA. Copyright (c) 2006 S. Karger AG, Basel.
机译:在当前的研究中,在器官发生后,即重要的氧化代谢激活时,在胎盘植入过程中,在大鼠胚胎中研究了线粒体增殖-分化过程。为此,我们在妊娠第11、12和13天研究了线粒体DNA(mtDNA)的含量以及涉及mtDNA复制的蛋白质(线粒体单链DNA结合蛋白(mtSSB)),mtDNA转录(线粒体转录因子)的相对基因表达A(TFAM)),以及线粒体功能(细胞色素C氧化酶亚基I(COXI))。结果表明,在胎盘植入过程中,大鼠胚胎的线粒体增殖分化过程发生了重要变化。细胞的线粒体DNA含量大大降低,TFAM与线粒体DNA的比例增加,伴随着COXI基因表达的增加。因此,我们可以得出结论,在妊娠第13天,线粒体分化比胚胎细胞中的线粒体增殖占优势。此外,我们的工作揭示了在诸如胚胎发育的生理条件下,TFAM水平会发生变化,从而调节mtDNA的转录活性。版权所有(c)2006 S.Karger AG,巴塞尔。

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