Mst1 promotes cardiac myocyte apoptosis through phosphorylation and inhibition of Bcl-xL.

Mst1 promotes cardiac myocyte apoptosis through phosphorylation and inhibition of Bcl-xL.
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MST1通过磷酸化和抑制BCL-XL促进心肌细胞凋亡。

DOI:
10.1016/j.molcel.2014.04.007
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发表时间:
2014-05-22
期刊:
影响因子:
16
通讯作者:
Sadoshima, Junichi
Sadoshima, Junichi
中科院分区:
生物学1区
文献类型:
--
作者:
Del Re, Dominic P.;Matsuda, Takahisa;Zhai, Peiyong;Maejima, Yasuhiro;Jain, Mohit Raja;Liu, Tong;Li, Hong;Hsu, Chiao-Po;Sadoshima, Junichi

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从果蝇到哺乳动物,Hippo 途径在进化上是保守的,可促进细胞死亡并抑制细胞增殖以调节器官大小。该级联的核心成分,哺乳动物细胞中的 Mst1,足以促进细胞凋亡。然而,其激活及其引发细胞死亡的能力的机制在很大程度上仍不清楚。我们在心肌细胞中发现了一种新型信号盒,由 K-Ras、支架 RASSF1A 和 Mst1 组成,该信号盒定位于线粒体并促进 Mst1 激活以响应氧化应激。激活的 Mst1 在 Ser14(位于 BH4 结构域中)处磷酸化 Bcl-xL,从而拮抗 Bcl-xL-Bax 结合。这反过来又导致 Bax 激活和随后的线粒体介导的细胞凋亡。我们的研究结果证明了 Hippo 信号传导的线粒体定位,并确定了该级联的一个新靶标 Bcl-xL,它被直接修饰以促进细胞凋亡。
The Hippo pathway, evolutionarily conserved from flies to mammals, promotes cell death and inhibits cell proliferation to regulate organ size. The core component of this cascade, Mst1 in mammalian cells, is sufficient to promote apoptosis. However, the mechanisms underlying both its activation and its ability to elicit cell death remain largely undefined. We here identify a novel signaling cassette in cardiac myocytes consisting of K-Ras, the scaffold RASSF1A and Mst1 that is localized to mitochondria and promotes Mst1 activation in response to oxidative stress. Activated Mst1 phosphorylates Bcl-xL at Ser14, which resides in the BH4 domain, thereby antagonizing Bcl-xL-Bax binding. This, in turn, causes activation of Bax and subsequent mitochondria-mediated apoptotic death. Our findings demonstrate mitochondrial localization of Hippo signaling and identify a novel target of this cascade, Bcl-xL, which is directly modified to promote apoptosis.
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