p53 opens the mitochondrial permeability transition pore to trigger necrosis

Cell. 2012 Jun 22;149(7):1536-48. doi: 10.1016/j.cell.2012.05.014.

Abstract

Ischemia-associated oxidative damage leading to necrosis is a major cause of catastrophic tissue loss, and elucidating its signaling mechanism is therefore of paramount importance. p53 is a central stress sensor responding to multiple insults, including oxidative stress to orchestrate apoptotic and autophagic cell death. Whether p53 can also activate oxidative stress-induced necrosis is, however, unknown. Here, we uncover a role for p53 in activating necrosis. In response to oxidative stress, p53 accumulates in the mitochondrial matrix and triggers mitochondrial permeability transition pore (PTP) opening and necrosis by physical interaction with the PTP regulator cyclophilin D (CypD). Intriguingly, a robust p53-CypD complex forms during brain ischemia/reperfusion injury. In contrast, reduction of p53 levels or cyclosporine A pretreatment of mice prevents this complex and is associated with effective stroke protection. Our study identifies the mitochondrial p53-CypD axis as an important contributor to oxidative stress-induced necrosis and implicates this axis in stroke pathology.

Publication types

  • Research Support, N.I.H., Extramural

MeSH terms

  • Animals
  • Brain Ischemia / metabolism
  • Brain Ischemia / pathology
  • Cell Line, Tumor
  • Cyclophilin D
  • Cyclophilins / metabolism
  • Embryo, Mammalian / cytology
  • Fibroblasts / metabolism
  • Humans
  • Male
  • Mice
  • Mice, 129 Strain
  • Mitochondrial Membrane Transport Proteins / metabolism*
  • Mitochondrial Permeability Transition Pore
  • Necrosis / metabolism*
  • Oxidative Stress*
  • Reperfusion Injury
  • Tumor Suppressor Protein p53 / metabolism*

Substances

  • Cyclophilin D
  • Mitochondrial Membrane Transport Proteins
  • Mitochondrial Permeability Transition Pore
  • PPIF protein, mouse
  • Tumor Suppressor Protein p53
  • Cyclophilins