A p53-phosphoinositide signalosome regulates nuclear AKT activation.

A p53-phosphoinositide signalosome regulates nuclear AKT activation.
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p53-磷酸肌醇信号体调节核AKT活化。

DOI:
10.1038/s41556-022-00949-1
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发表时间:
2022-07
影响因子:
21.3
通讯作者:
--
中科院分区:
生物学1区
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肿瘤抑制因子p53和磷酸肌醇3-激酶(PI 3 K)-Akt通路在调节细胞生长和凋亡中具有重要作用,并且它们在癌症中经常突变。在这里,我们表明,基因毒性应激诱导核Akt激活的p53依赖性机制,这是不同于典型的膜定位PI 3 K-Akt通路。在遗传毒性应激时,核PI 3 K与非膜核质中的p53结合以产生p53-PI 3,4,5 P3复合物,其募集激活Akt所需的Akt和PDK 1和mTORC 2,并磷酸化FOXO,从而抑制DNA损伤诱导的细胞凋亡。野生型p53在应激时以开/关方式激活核Akt,而突变型p53剂量依赖性地刺激高基础Akt活性。p53-PI 3,4,5 P3复合物通过磷酸酶和张力蛋白同源物(PTEN)去磷酸化为p53-PI 4,5 P2以抑制Akt活化。核p53-磷酸肌醇信号体与经典的膜定位途径不同,并且对目前临床上的PI 3 K抑制剂不敏感,这强调了其治疗相关性。p53组装PI 3 K-PI 3,4,5 P3-Akt通路,其独立于膜上的经典通路调节核Akt活化。
The tumor suppressor p53 and phosphoinositide 3-kinase (PI3K)-Akt pathway have fundamental roles in regulating cell growth and apoptosis, and they are frequently mutated in cancer. Here, we show that genotoxic stress induces nuclear Akt activation by a p53-dependent mechanism that is distinct from the canonical membrane-localized PI3K-Akt pathway. Upon genotoxic stress, a nuclear PI3K binds to p53 in the non-membranous nucleoplasm to generate a p53-PI3,4,5P3 complex, which recruits Akt and PDK1 and mTORC2 that are required to activate Akt, and phosphorylates FOXOs, thereby inhibiting DNA damage-induced apoptosis. Wild-type p53 activates nuclear Akt in an on/off fashion upon stress, whereas mutant p53 dose dependently stimulates high basal Akt activity. The p53-PI3,4,5P3 complex is dephosphorylated to p53-PI4,5P2 by the phosphatase and tensin homolog (PTEN) to inhibit Akt activation. The nuclear p53-phosphoinositide signalosome is distinct from the canonical membrane-localized pathway and insensitive to PI3K inhibitors currently in the clinic, underscoring its therapeutic relevance. p53 assembles a PI3K-PI3,4,5P3-Akt pathway that regulates nuclear Akt activation independent of the canonical pathway on membranes.
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