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首页> 外文期刊>Cancer Cell >An E2F1-dependent gene expression program that determines the balance between proliferation and cell death.
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An E2F1-dependent gene expression program that determines the balance between proliferation and cell death.

机译:E2F1依赖性基因表达程序,可确定增殖与细胞死亡之间的平衡。

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摘要

The Rb/E2F pathway regulates the expression of genes essential for cell proliferation but that also trigger apoptosis. During normal proliferation, PI3K/Akt signaling blocks E2F1-induced apoptosis, thus serving to balance proliferation and death. We now identify a subset of E2F1 target genes that are specifically repressed by PI3K/Akt signaling, thus distinguishing the E2F1 proliferative or apoptotic function. RNAi-mediated inhibition of several of these PI3K-repressed E2F1 target genes, including AMPK alpha 2, impairs apoptotic induction by E2F1. Activation of AMPK alpha 2 with an AMP analog further stimulates E2F1-induced apoptosis. We also show that the presence of the E2F1 apoptotic expression program in breast and ovarian tumors coincides with good prognosis, emphasizing the importance of the balance in the E2F1 proliferation/apoptotic program.
机译:Rb / E2F途径调节细胞增殖所必需的基因的表达,但也可以触发细胞凋亡。在正常增殖过程中,PI3K / Akt信号传导阻滞了E2F1诱导的细胞凋亡,从而平衡了增殖和死亡。现在,我们确定被PI3K / Akt信号特异性抑制的E2F1目标基因的子集,从而区分E2F1的增殖或凋亡功能。 RNAi介导的对这些PI3K抑制的E2F1靶基因中的几个的抑制,包括AMPK alpha 2,削弱了E2F1对细胞凋亡的诱导作用。用AMP类似物激活AMPK alpha 2进一步刺激E2F1诱导的细胞凋亡。我们还显示,E2F1凋亡表达程序在乳腺和卵巢肿瘤中的存在与良好的预后相吻合,强调了E2F1增殖/凋亡程序中平衡的重要性。

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