PML regulates apoptosis at endoplasmic reticulum by modulating calcium release.

PML regulates apoptosis at endoplasmic reticulum by modulating calcium release.
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DOI:
10.1126/science.1189157
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发表时间:
2010-11-26
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Pandolfi PP
Pandolfi PP
中科院分区:
其他
文献类型:
--
作者:
Giorgi C;Ito K;Lin HK;Santangelo C;Wieckowski MR;Lebiedzinska M;Bononi A;Bonora M;Duszynski J;Bernardi R;Rizzuto R;Tacchetti C;Pinton P;Pandolfi PP

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早幼粒细胞白血病(PML)肿瘤抑制因子是细胞凋亡的多效性调节因子。然而,这种多样的促凋亡作用的分子基础目前尚不清楚。我们发现,特异性富集在内质网(ER)和在ESTA相关的膜,参与ER-线粒体钙离子(Ca 2+)的运输和诱导细胞凋亡的信号结构域的细胞核Pml。我们发现Pml与肌醇1,4,5-三磷酸受体(IP 3R)、蛋白激酶Akt和蛋白磷酸酶2a(PP 2a)的大分子大小的复合物中。Pml对Akt和PP 2a依赖性调节IP 3R磷酸化以及IP 3R介导的Ca 2+从ER释放至关重要。我们的研究结果提供了一个机制解释Pml在细胞凋亡中的多效性作用,并确定了一个药理学靶点的Ca 2+信号的调制。
The promyelocytic leukemia (PML) tumor suppressor is a pleiotropic modulator of apoptosis. However, the molecular basis for such a diverse proapoptotic role is currently unknown. We show that extranuclear Pml was specifically enriched at the endoplasmic reticulum (ER) and at the mitochondria-associated membranes, signaling domains involved in ER-to-mitochondria calcium ion (Ca2+) transport and in induction of apoptosis. We found Pml in complexes of large molecular size with the inositol 1,4,5-trisphosphate receptor (IP3R), protein kinase Akt, and protein phosphatase 2a (PP2a). Pml was essential for Akt- and PP2a-dependent modulation of IP3R phosphorylation and in turn for IP3R-mediated Ca2+ release from ER. Our findings provide a mechanistic explanation for the pleiotropic role of Pml in apoptosis and identify a pharmacological target for the modulation of Ca2+ signals.
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