Cited by 484Mitochondrial Function and PathologyAutophagy in Disease and TherapyCell death mechanisms and regulation

Mitochondrial Fission and Fusion Factors Reciprocally Orchestrate Mitophagic Culling in Mouse Hearts and Cultured Fibroblasts

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Song, Moshi, Mihara, Katsuyoshi, Chen, Yun, Scorrano, Luca, Dorn, Gerald W.·2015·Cell Metabolism

Abstract

How mitochondrial dynamism (fission and fusion) affects mitochondrial quality control is unclear. We uncovered distinct effects on mitophagy of inhibiting Drp1-mediated mitochondrial fission versus mitofusin-mediated mitochondrial fusion. Conditional cardiomyocyte-specific Drp1 ablation evoked mitochondrial enlargement, lethal dilated cardiomyopathy, and cardiomyocyte necrosis. Conditionally ablating cardiomyocyte mitofusins (Mfn) caused mitochondrial fragmentation with eccentric remodeling and no cardiomyocyte dropout. Parallel studies in cultured murine embryonic fibroblasts (MEFs) and in vivo mouse hearts revealed that Mfn1/Mfn2 deletion provoked accumulation of defective mitochondria exhibiting an unfolded protein response, without appropriately increasing mitophagy. Conversely, interrupting mitochondrial fission by Drp1 ablation increased mitophagy and caused a generalized loss of mitochondria. Mitochondrial permeability transition pore (MPTP) opening in Drp1 null mitochondria was associated with mitophagy in MEFs and contributed to cardiomyocyte necrosis and dilated cardiomyopathy in mice. Drp1, MPTP, and cardiomyocyte mitophagy are functionally integrated. Mitochondrial fission and fusion have opposing roles during in vivo cardiac mitochondrial quality control.

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Authors
Song, M., Mihara, K., Chen, Y., Scorrano, L., & Dorn, G. W.
Affiliations
  • Washington University in St. Louis (US)
  • Kyushu University (JP)
  • University of Padua (IT)
Corresponding author
Dorn, Gerald W.
Venue
Cell Metabolism
Publisher
Elsevier BV
Published
2015-02
Volume
21
Issue
2
Pages
273-286
ISSN
1550-4131 (ISSN-L)
OpenAlex
W2044929466
Cited by
482
References
47
Citations by year
2026: 21 · 2025: 31 · 2024: 51 · 2023: 42 · 2022: 42 · 2021: 63 · 2020: 55 · 2019: 43 · 2018: 39 · 2017: 33 · 2016: 40 · 2015: 21
FWCI
19.24
Type
journal article
Language
en
Open access
Locations
  • Cell Metabolism (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
  • Padua Research Archive (University of Padova) (submittedVersion)
Funders
  • Japan Society for the Promotion of Science (25291046)
  • National Heart, Lung, and Blood Institute (HL59888, R01HL059888)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Mitochondrial Function and Pathology
  • Health Sciences › Medicine › Epidemiology › Autophagy in Disease and Therapy
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Cell death mechanisms and regulation
Keywords
mitochondrial fission, mitochondrial fusion, mitophagy, Drp1, mitofusins, Mfn1, mitofusin 2, mitochondrial quality control, myocardial necrosis, dilated cardiomyopathy, mitochondrial permeability transition pore, unfolded protein response, mitochondrial fragmentation, embryonic fibroblasts, heart
MeSH terms
Animals, Cells, Cultured, Fibroblasts, Mice, Transgenic, Mitochondria, Heart, Myocardium, Mice, Knockout, GTP Phosphohydrolases, Dynamins, Mice, Mitochondrial Dynamics, Mitophagy

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