Bax and Bak function as the outer membrane component of the mitochondrial permeability pore in regulating necrotic cell death in mice

Jason Karch, Jennifer Q. Kwong, Adam R. Burr, Michelle A. Sargent, John W. Elrod, Pablo M. Peixoto, Sonia Martinez-Caballero, Hanna Osinska, Emily H.Y. Cheng, Jeffrey Robbins, Kathleen W. Kinnally, Jeffery D. Molkentin

Research output: Contribution to journalArticle

Abstract

A critical event in ischemia-based cell death is the opening of the mitochondrial permeability transition pore (MPTP). However, the molecular identity of the components of the MPTP remains unknown. Here, we determined that the Bcl-2 family members Bax and Bak, which are central regulators of apoptotic cell death, are also required for mitochondrial pore-dependent necrotic cell death by facilitating outer membrane permeability of the MPTP. Loss of Bax/Bak reduced outer mitochondrial membrane permeability and conductance without altering inner membrane MPTP function, resulting in resistance to mitochondrial calcium overload and necrotic cell death. Reconstitution with mutants of Bax that cannot oligomerize and form apoptotic pores, but still enhance outer membrane permeability, permitted MPTP-dependent mitochondrial swelling and restored necrotic cell death. Our data predict that the MPTP is an inner membrane regulated process, although in the absence of Bax/Bak the outer membrane resists swelling and prevents organelle rupture to prevent cell death.

Original languageEnglish (US)
Article numbere00772
JournaleLife
Volume2013
Issue number2
DOIs
StatePublished - Aug 27 2013

ASJC Scopus subject areas

  • Neuroscience(all)
  • Immunology and Microbiology(all)
  • Biochemistry, Genetics and Molecular Biology(all)

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    Karch, J., Kwong, J. Q., Burr, A. R., Sargent, M. A., Elrod, J. W., Peixoto, P. M., Martinez-Caballero, S., Osinska, H., Cheng, E. H. Y., Robbins, J., Kinnally, K. W., & Molkentin, J. D. (2013). Bax and Bak function as the outer membrane component of the mitochondrial permeability pore in regulating necrotic cell death in mice. eLife, 2013(2), [e00772]. https://doi.org/10.7554/eLife.00772.001