Plzf regulates germline progenitor self-renewal by opposing mTORC1.

Plzf regulates germline progenitor self-renewal by opposing mTORC1.
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DOI:
10.1016/j.cell.2010.06.041
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发表时间:
2010-08-06
期刊:
影响因子:
64.5
通讯作者:
Pandolfi PP
Pandolfi PP
中科院分区:
生物学1区
文献类型:
--
作者:
Hobbs RM;Seandel M;Falciatori I;Rafii S;Pandolfi PP

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MTORC1是细胞生长的关键介质,它的过度活跃导致干细胞枯竭,尽管其潜在的机制尚不清楚。以精原祖细胞(SPC)为模型系统,我们证明了mTORC1通过mTORC1对转导生态位信号所需的受体的负反馈来损害干细胞的维持。我们发现,缺乏PLZF的SPC具有增强mTORC1活性的作用。PLZF是SPC维持所必需的转录因子。PLZFSPC中mTORC 1的异常激活通过在−/−受体水平上的负反馈来抑制它们对GDNF的反应。GDNF是一种对SPC自我更新至关重要的生长因子。PLZF通过诱导mTORC1抑制因子Redd1的表达来对抗mTORC1的活性。因此,我们认为mTORC1-PLZF功能相互作用是维持精原细胞池的关键变阻器,并提出了一个模型,即mTORC1对GDNF受体的负反馈平衡了SPC的生长和自我更新。
Hyperactivity of mTORC1, a key mediator of cell growth, leads to stem cell depletion although the underlying mechanisms are poorly defined. Using spermatogonial progenitor cells (SPCs) as a model system, we show that mTORC1 impairs stem cell maintenance by a negative feedback from mTORC1 to receptors required to transduce niche-derived signals. We find that SPCs lacking Plzf, a transcription factor essential for SPC maintenance, have enhanced mTORC1 activity. Aberrant mTORC1 activation in Plzf −/− SPCs inhibits their response to GDNF, a growth factor critical for SPC self-renewal, via negative feedback at the level of the GDNF receptor. Plzf opposes mTORC1 activity by inducing expression of the mTORC1 inhibitor Redd1. Thus, we identify the mTORC1-Plzf functional interaction as a critical rheostat for maintenance of the spermatogonial pool, and propose a model whereby negative feedback from mTORC1 to the GDNF receptor balances SPC growth with self-renewal.
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