Cited by 220Cell death mechanisms and regulationMitochondrial Function and PathologyAutophagy in Disease and Therapy

Mitochondrial Shape Governs BAX-Induced Membrane Permeabilization and Apoptosis

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Renault, Thibaud T., Floros, Konstantinos V., Elkholi, Rana, Corrigan, Kelly-Ann, Kushnareva, Yulia, Wieder, Shira Y., Lindtner, Claudia, Serasinghe, Madhavika N. +4 more·2015·Molecular Cell

Abstract

Proapoptotic BCL-2 proteins converge upon the outer mitochondrial membrane (OMM) to promote mitochondrial outer membrane permeabilization (MOMP) and apoptosis. Here we investigated the mechanistic relationship between mitochondrial shape and MOMP and provide evidence that BAX requires a distinct mitochondrial size to induce MOMP. We utilized the terminal unfolded protein response pathway to systematically define proapoptotic BCL-2 protein composition after stress and then directly interrogated their requirement for a productive mitochondrial size. Complementary biochemical, cellular, in vivo, and ex vivo studies reveal that Mfn1, a GTPase involved in mitochondrial fusion, establishes a mitochondrial size that is permissive for proapoptotic BCL-2 family function. Cells with hyperfragmented mitochondria, along with size-restricted OMM model systems, fail to support BAX-dependent membrane association and permeabilization due to an inability to stabilize BAXα9·membrane interactions. This work identifies a mechanistic contribution of mitochondrial size in dictating BAX activation, MOMP, and apoptosis.

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Authors
Renault, T. T., Floros, K. V., Elkholi, R., Corrigan, K.-A., Kushnareva, Y., Wieder, S. Y., Lindtner, C., Serasinghe, M. N., Asciolla, J. J., Buettner, C., Newmeyer, D. D., & Chipuk, J. E.
Affiliations
  • Tisch Cancer Institute (US)
  • Icahn School of Medicine at Mount Sinai (US)
  • La Jolla Institute for Immunology (US)
  • Mount Sinai Hospital (US)
Corresponding author
Chipuk, Jerry E.
Venue
Molecular Cell
Publisher
Elsevier BV
Published
2015-01
Volume
57
Issue
1
Pages
69-82
ISSN
1097-2765 (ISSN-L)
OpenAlex
W2049807952
Cited by
217
References
51
Citations by year
2026: 13 · 2025: 11 · 2024: 13 · 2023: 14 · 2022: 20 · 2021: 23 · 2020: 22 · 2019: 21 · 2018: 18 · 2017: 23 · 2016: 24 · 2015: 15
FWCI
8.48
Type
journal article
Language
en
Open access
Locations
  • Molecular Cell (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
  • Rutgers University Community Repository (Rutgers University) (submittedVersion)
Funders
  • National Institutes of Health (5r01aa023416-04)
  • National Institute on Alcohol Abuse and Alcoholism (NIH P20AA017067, P20AA017067, R01-AA-023416)
  • National Cancer Institute (CA157740, R01CA157740)
  • National Institute of Diabetes and Digestive and Kidney Diseases (DK083568, R03DK082724, K08DK074873, DK-082724)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Cell death mechanisms and regulation
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Mitochondrial Function and Pathology
  • Health Sciences › Medicine › Epidemiology › Autophagy in Disease and Therapy
Keywords
mitochondrial morphology, mitochondrial size, Bax, mitochondrial outer membrane permeabilization, apoptosis, Bcl-2 family proteins, Mfn1, mitochondrial fusion, mitochondrial outer membrane
MeSH terms
Bcl-2-Like Protein 11, Animals, Gene Expression Regulation, Membrane Proteins, Mitochondria, Liver, Permeability, Proto-Oncogene Proteins, Signal Transduction, Apoptosis, GTP Phosphohydrolases, bcl-2 Homologous Antagonist-Killer Protein, Apoptosis Regulatory Proteins, bcl-2-Associated X Protein, Mitochondrial Membranes, Mice, Membrane Potential, Mitochondrial, Organelle Shape, Unilamellar Liposomes, Mitochondrial Dynamics

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