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Phosphatidylinositol 3-Kinase/Akt Mediates Integrin Signaling To Control RNA Polymerase I Transcriptional Activity

机译:磷脂酰肌醇3-激酶/ Akt介导整合素信号控制RNA聚合酶I转录活性。

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RNA polymerase I-mediated rRNA production is a key determinant of cell growth. Despite extensive studies, the signaling pathways that control RNA polymerase I-mediated rRNA production are not well understood. Here we provide original evidence showing that RNA polymerase I transcriptional activity is tightly controlled by integrin signaling. Furthermore, we show that a signaling axis consisting of focal adhesion kinase (FAK), Src, phosphatidylinositol 3-kinase (PI3K), Akt, and mTOR mediates the effect of integrin signaling on rRNA transcription. Additionally, we show that in kindlin-2 knockout mouse embryonic fibroblasts, overactivation of Ras, Akt, and Src can successfully rescue the defective RNA polymerase I activity induced by the loss of kindlin-2. Finally, through experiments with inhibitors of FAK, Src, and PI3K and rescue experiments in MEFs, we found that the FAK/Src/PI3K/Akt signaling pathway to control rRNA transcription is linear. Collectively, these studies reveal, for the first time, a pivotal role of integrin signaling in regulation of RNA polymerase I transcriptional activity and shed light on the downstream signaling axis that participates in regulation of this key aspect of cell growth.
机译:RNA聚合酶I介导的rRNA产生是细胞生长的关键决定因素。尽管进行了广泛的研究,但对控制RNA聚合酶I介导的rRNA产生的信号通路尚不十分了解。在这里,我们提供了原始证据,显示RNA聚合酶I的转录活性受到整联蛋白信号的严格控制。此外,我们表明,由粘着斑激酶(FAK),Src,磷脂酰肌醇3-激酶(PI3K),Akt和mTOR组成的信号轴介导了整联蛋白信号对rRNA转录的影响。此外,我们显示出在kindlin-2基因敲除的小鼠胚胎成纤维细胞中,Ras,Akt和Src的过度激活可以成功地挽救由kindlin-2缺失引起的有缺陷的RNA聚合酶I活性。最后,通过使用FAK,Src和PI3K抑制剂进行的实验以及MEF中的拯救实验,我们发现控制rRNA转录的FAK / Src / PI3K / Akt信号传导途径是线性的。总的来说,这些研究首次揭示了整联蛋白信号在调节RNA聚合酶I转录活性中的关键作用,并阐明了参与调节细胞生长这一关键方面的下游信号传导轴。

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