Modulation of the Nur77-Bcl-2 apoptotic pathway by p38α MAPK.

Modulation of the Nur77-Bcl-2 apoptotic pathway by p38α MAPK.
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p38 α MAPK 对 Nur77-Bcl-2 凋亡途径的调节

DOI:
10.18632/oncotarget.19227
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发表时间:
2017-09-19
期刊:
影响因子:
--
通讯作者:
Zhang XK
Zhang XK
中科院分区:
其他
文献类型:
--
作者:
Liu J;Wang GH;Duan YH;Dai Y;Bao Y;Hu M;Zhou YQ;Li M;Jiang F;Zhou H;Yao XS;Zhang XK

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孤儿核受体Nur 77通过与Bcl-2相互作用靶向线粒体来促进凋亡,这是一种将Bcl-2从存活转化为杀伤的事件。然而,Nur 77-Bcl-2凋亡途径如何调节仍然是未知的。在这项研究中,我们研究了Nur 77-Bcl-2通路的调节CCE 9,一种氧杂蒽酮化合物。我们的研究结果表明,CCE 9的凋亡作用依赖于其诱导的Nur 77表达,细胞质定位,和线粒体靶向。CCE 9对Nur 77-Bcl-2通路的激活与其对p38α MAPK的激活有关。通过敲低或敲除p38α MAPK来抑制p38 α MAPK的活化,削弱了CCE 9诱导凋亡的作用以及Nur 77的表达和胞浆定位。此外,CCE 9激活p38α MAPK导致Bcl-2磷酸化和Bcl-2与Nur 77的相互作用,而抑制p38α MAPK激活或表达则抑制相互作用。此外,突变Bcl-2环中的Ser 87和Thr 56(已知它们被p38α MAPK磷酸化),削弱了Bcl-2与Nur 77相互作用的能力。总之,我们的结果揭示了p38α MAPK通过调节Nur 77表达、Bcl-2磷酸化及其相互作用在调节Nur 77-Bcl-2凋亡通路中的深刻作用。
Orphan nuclear receptor Nur77 promotes apoptosis by targeting mitochondria through interaction with Bcl-2, an event that converts Bcl-2 from a survival to killer. However, how the Nur77-Bcl-2 apoptotic pathway is regulated remains largely unknown. In this study, we examined the regulation of the Nur77-Bcl-2 pathway by CCE9, a xanthone compound. Our results demonstrated that the apoptotic effect of CCE9 depended on its induction of Nur77 expression, cytoplasmic localization, and mitochondrial targeting. The activation of the Nur77-Bcl-2 pathway by CCE9 was associated with its activation of p38α MAPK. Inhibition of p38α MAPK activation by knocking down or knocking out p38α MAPK impaired the effect of CCE9 on inducing apoptosis and the expression and cytoplasmic localization of Nur77. In addition, CCE9 activation of p38α MAPK resulted in Bcl-2 phosphorylation and Bcl-2 interaction with Nur77, whereas inhibition of p38α MAPK activation or expression suppressed the interaction. Moreover, mutating Ser87 and Thr56 in the loop of Bcl-2, which are known to be phosphorylated by p38α MAPK, impaired the ability Bcl-2 to interact with Nur77. Together, our results reveal a profound role of p38α MAPK in regulating the Nur77-Bcl-2 apoptotic pathway through its modulation of Nur77 expression, Bcl-2 phosphorylation, and their interaction.
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