The apical complex couples cell fate and cell survival to cerebral cortical development.

The apical complex couples cell fate and cell survival to cerebral cortical development.
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DOI:
10.1016/j.neuron.2010.03.019
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发表时间:
2010-04-15
期刊:
影响因子:
16.2
通讯作者:
Walsh CA
Walsh CA
中科院分区:
医学1区
文献类型:
--
作者:
Kim S;Lehtinen MK;Sessa A;Zappaterra MW;Cho SH;Gonzalez D;Boggan B;Austin CA;Wijnholds J;Gambello MJ;Malicki J;LaMantia AS;Broccoli V;Walsh CA

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皮质发育依赖于严格控制的细胞命运和细胞存活决定,从而产生功能神经元群体,但这两个过程的协调鲜为人知。在这里,我们表明,有条件地移除关键的顶端复杂蛋白Pals1会导致过早退出细胞周期,导致早期出生的有丝分裂后神经元的过度生成,随后是令人惊讶的大规模和快速的细胞死亡,导致几乎整个皮质结构的废除。Pals1缺失表现出极高的剂量敏感性,因此杂合子突变体在细胞命运和细胞死亡方面表现出中等的表型。Pals1的缺失阻断了重要的细胞生存信号,包括哺乳动物的雷帕霉素靶标(MTOR)途径,而mTORC1的激活部分挽救了Pals1的缺失。这些数据突显了顶端复杂蛋白Pals1通过与mTOR信号相互作用在细胞存活中意想不到的作用。
Cortical development depends upon tightly controlled cell fate and cell survival decisions that generate a functional neuronal population, but the coordination of these two processes is poorly understood. Here we show that conditional removal of a key apical complex protein, Pals1, causes premature withdrawal from the cell cycle, inducing excessive generation of early-born postmitotic neurons followed by surprisingly massive and rapid cell death, leading to the abrogation of virtually the entire cortical structure. Pals1 loss shows exquisite dosage sensitivity, so that heterozygote mutants show an intermediate phenotype on cell fate and cell death. Loss of Pals1 blocks essential cell survival signals, including the mammalian target of rapamycin (mTOR) pathway, while mTORC1 activation partially rescues Pals1 deficiency. These data highlight unexpected roles of the apical complex protein Pals1 in cell survival through interactions with mTOR signaling.
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