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AIF promotes chromatinolysis and caspase-independent programmed necrosis by interacting with histone H2AX

热1 sairs.2003 添加于 2010-4-5 07:08 | 2991 次阅读 | 1 个评论

作者
Artus C, Boujrad H, Bouharrour A, Brunelle MN, Hoos S, Yuste VJ, Lenormand P, Rousselle JC, Namane A, England P, Lorenzo HK, Susin SA
摘要
Programmed necrosis induced by DNA alkylating agents, such as MNNG, is a caspase-independent mode of cell death mediated by apoptosis-inducing factor (AIF). After poly(ADP-ribose) polymerase 1, calpain, and Bax activation, AIF moves from the mitochondria to the nucleus where it induces chromatinolysis and cell death. The mechanisms underlying the nuclear action of AIF are, however, largely unknown. We show here that, through its C-terminal proline-rich binding domain (PBD, residues 543-559), AIF associates in the nucleus with histone H2AX. This interaction regulates chromatinolysis and programmed necrosis by generating an active DNA-degrading complex with cyclophilin A (CypA). Deletion or directed mutagenesis in the AIF C-terminal PBD abolishes AIF/H2AX interaction and AIF-mediated chromatinolysis. H2AX genetic ablation or CypA downregulation confers resistance to programmed necrosis. AIF fails to induce chromatinolysis in H2AX or CypA-deficient nuclei. We also establish that H2AX is phosphorylated at Ser139 after MNNG treatment and that this phosphorylation is critical for caspase-independent programmed necrosis. Overall, our data shed new light in the mechanisms regulating programmed necrosis, elucidate a key nuclear partner of AIF, and uncover an AIF apoptogenic motif.
详细资料
- 文献种类:期刊
- 期刊名称: The EMBO Journal
- 期刊缩写: EMBO J
- 期卷页: 2010年
- 地址: [1] INSERM U872, Mort cellulaire programmee et physiopathologie des cellules tumorales, Centre de Recherche des Cordeliers, Paris, France [2] Universite Pierre et Marie Curie, Paris, France [3] Universite Paris Descartes, Paris, France
- ISBN: 0261-4189
- 备注:PMID:20360685
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