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Prep1 Directly Regulates the Intrinsic Apoptotic Pathway by Controlling Bcl-XL Levels

机译:Prep1通过控制Bcl-XL水平直接调节内在的凋亡途径。

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The Prep1 homeodomain transcription factor is essential in embryonic development. Prep1 hypomorphic mutant mouse (Prep1i/i) embryos (embryonic day 9.5) display an increased terminal deoxynucleotidyltransferase-mediated dUTP-biotin nick end labeling reaction compared to wild-type (WT) littermates. Prep1i/i mouse embryo fibroblasts (MEFs) show an increased basal level of annexin V binding activity, reduction of the mitochondrial-membrane potential, and increased caspase 9 and 3 activation, indicating increased apoptosis. Prep1i/i MEFs also respond faster than WT MEFs to genotoxic stress, indicating increased activation of the intrinsic apoptotic pathways. We did not observe an increase in p53 or an abnormal p53 response to apoptotic stimuli. However, hypomorphic MEFs have decreased endogenous levels of antiapoptotic Bcl-XL mRNA and protein, and Bcl-x overexpression rescues the defect of Prep1i/i MEFs. Using transient transfections and chromatin immunoprecipitation, we identified the Bcl-x promoter as a novel target of Prep1. Thus, Prep1 directly controls mitochondrial homeostasis (and the apoptotic potential) by modulating Bcl-x gene expression.
机译:Prep1同源域转录因子在胚胎发育中至关重要。 Prep1亚型突变小鼠( Prep1 i / i )胚胎(胚胎第9.5天)显示出增加的末端脱氧核苷酸转移酶介导的dUTP-生物素缺口末端标记与野生型(WT)同窝仔相比。 Prep1 i / i 小鼠胚胎成纤维细胞(MEF)显示基础水平的膜联蛋白V结合活性增加,线粒体膜电位降低, caspase 9和3激活增加,表明细胞凋亡增加。 Prep1 i / i MEF对遗传毒性胁迫的反应也比WT MEF快,表明内在的凋亡途径的激活增加。我们没有观察到p53的增加或对凋亡刺激的异常p53反应。然而,亚型MEFs降低了内源性抗凋亡Bcl-X L mRNA和蛋白质的水平,而 Bcl-x 的过度表达挽救了 Prep1 < sup> i / i MEF。使用瞬时转染和染色质免疫沉淀,我们确定了 Bcl-x 启动子是Prep1的新型靶标。因此,Prep1通过调节 Bcl-x 基因表达来直接控制线粒体的体内稳态(以及凋亡潜力)。

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