Phosphorylation of ULK1 by AMPK is essential for mouse embryonic stem cell self-renewal and pluripotency.

Phosphorylation of ULK1 by AMPK is essential for mouse embryonic stem cell self-renewal and pluripotency.
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AMPK 对 ULK1 的磷酸化对于小鼠胚胎干细胞的自我更新和多能性至关重要。

DOI:
10.1038/s41419-017-0054-z
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发表时间:
2018-01-18
影响因子:
9
通讯作者:
Zhao T
Zhao T
中科院分区:
生物学1区
文献类型:
--
作者:
Gong J;Gu H;Zhao L;Wang L;Liu P;Wang F;Xu H;Zhao T

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自噬是体细胞中降解受损细胞器和聚集蛋白的分解代谢过程。我们最近发现,自噬是胚胎干细胞(ESC)线粒体稳态的执行者,因此有助于干细胞调节。然而,ESC中自噬的调控和功能机制在很大程度上仍然未知。在这里,我们已经证明AMPK激活ULK1对ESC自我更新和多能性至关重要。Ulk1功能障碍降低ESC的自噬通量,导致自我更新和多能性受损。这些缺陷可以通过重新获得野生型ULK1和ULK1(S757A)突变体来修复,但不能通过重新获得ULK1(S317A、S555A和S777A)和激酶死亡的ULK1(K46I)突变体来修复。这些数据表明,AMPK磷酸化ULK1,而不是mTOR,是ESC干细胞调控的必要条件。这些发现强调了ampk依赖性的ULK1途径磷酸化在维持ESC自我更新和多能性方面的关键作用。
Autophagy is a catabolic process to degrade both damaged organelles and aggregated proteins in somatic cells. We have recently identified that autophagy is an executor for mitochondrial homeostasis in embryonic stem cell (ESC), and thus contribute to stemness regulation. However, the regulatory and functional mechanisms of autophagy in ESC are still largely unknown. Here we have shown that activation of ULK1 by AMPK is essential for ESC self-renewal and pluripotency. Dysfunction of Ulk1 decreases the autophagic flux in ESC, leading to compromised self-renewal and pluripotency. These defects can be rescued by reacquisition of wild-type ULK1 and ULK1(S757A) mutant, but not ULK1(S317A, S555A and S777A) and kinase dead ULK1(K46I) mutant. These data indicate that phosphorylation of ULK1 by AMPK, but not mTOR, is essential for stemness regulation in ESC. The findings highlight a critical role for AMPK-dependent phosphorylation of ULK1 pathway to maintain ESC self-renewal and pluripotency.
AMP激活的蛋白激酶对ULK1(HATG1)的磷酸化将能量传感连接到线粒体。
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