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

Cédric Artus, Hanan Boujrad, Ada Bouharrour, Marie Noëlle Brunelle, Sylviane Hoos, Victor J. Yuste, Pascal Lenormand, Jean Claude Rousselle, Abdelkader Namane, Patrick England, Hans K. Lorenzo, Santos A. Susin

Research output: Contribution to journalArticleResearchpeer-review

150 Citations (Scopus)

Abstract

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. © 2010 European Molecular Biology Organization.
Original languageEnglish
Pages (from-to)1585-1599
JournalEMBO Journal
Volume29
DOIs
Publication statusPublished - 1 Jan 2010

Keywords

  • AIF
  • DNA damage
  • H2AX
  • PARP-1
  • Programmed necrosis

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