IGF-IR-dependent expression of Survivin is required for T-antigen-mediated protection from apoptosis and proliferation of neural progenitors.

IGF-IR-dependent expression of Survivin is required for T-antigen-mediated protection from apoptosis and proliferation of neural progenitors.
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DOI:
10.1038/cdd.2009.146
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发表时间:
2010-03
影响因子:
12.4
通讯作者:
Del Valle L
Del Valle L
中科院分区:
生物学1区
文献类型:
--
作者:
Gualco E;Urbanska K;Perez-Liz G;Sweet T;Peruzzi F;Reiss K;Del Valle L

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胰岛素样生长因子-1受体(IGF-IR)和人多瘤病毒JCV蛋白、T抗原在小脑神经元前体的转化中协同作用,这可能是脑肿瘤发展的促成因素。由于尚不清楚为什么T抗原需要IGF-IR进行转化,我们在来自IGF-IR敲除胚胎(ko-IGF-IR)和来自其野生型非转基因同窝出生仔(wt-IGF-IR)的神经祖细胞中研究了该过程。与wt-IGF-IR相反,Ko-IGF-IR胚胎的脑和背根神经节显示出低水平的抗凋亡蛋白Survivin,伴随着凋亡神经元数量的增加和早期分化表型。在体外培养的wt-IGF-IR神经祖细胞中,T抗原表达的诱导使Survivin的表达增加两倍,并加速细胞增殖。在ko-IGF-IR祖细胞中,T抗原的诱导未能增加Survivin,导致大量凋亡。重要的是,Survivin的异位表达保护ko-IGF-IR祖细胞免于凋亡,并且Survivin的siRNA抑制激活表达T抗原的wt-IGF-IR祖细胞中的凋亡。我们的研究结果表明,抗凋亡生存素的再激活可能是一个关键步骤,在JCV T抗原诱导的转化,这在神经祖细胞需要IGF-IR。
The Insulin-like Growth Factor-1 Receptor (IGF-IR) and the human polyomavirus JCV protein, T-Antigen cooperate in the transformation of neuronal precursors in the cerebellum, which may be a contributing factor in the development of brain tumors. Since it is not clear why T-Antigen requires IGF-IR for transformation, we investigated this process in neural progenitors from IGF-IR knockout embryos (ko-IGF-IR) and from their wild type non-transgenic littermates (wt-IGF-IR). In contrast to wt-IGF-IR, the brain and dorsal root ganglia of ko-IGF-IR embryos showed low levels of the anti-apoptotic protein Survivin, accompanied by elevated numbers of apoptotic neurons and an earlier differentiation phenotype. In wt-IGF-IR neural progenitors in vitro, induction of T-Antigen expression tripled the expression of Survivin, and accelerated cell proliferation. In ko-IGF-IR progenitors induction of T-Antigen failed to increase Survivin, resulting in massive apoptosis. Importantly, ectopic expression of Survivin protected ko-IGF-IR progenitor cells from apoptosis and siRNA inhibition of Survivin activated apoptosis in wt-IGF-IR progenitors expressing T-Antigen. Our results indicate that reactivation of the anti-apoptotic Survivin may be a critical step in JCV T-Antigen induced transformation, which in neural progenitors requires IGF-IR.
DOI: 10.1074/jbc.m110885200
发表时间: 2002-05-10
影响因子: 4.8
作者:
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发表时间: 1996-08-06
影响因子: 11.1
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DOI: 10.1080/13550280290101111
发表时间: 2002-12-01
影响因子: 3.2
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