Journal
BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS
Volume 1777, Issue 9, Pages 1092-1097Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.bbabio.2008.05.001
Keywords
mitochondria; membrane potential; fusion; fission; autophagy
Categories
Funding
- National Institutes of Health [5R01 HL071629-03, 5R01 DK074778]
- NATIONAL HEART, LUNG, AND BLOOD INSTITUTE [R01HL071629] Funding Source: NIH RePORTER
- NATIONAL INSTITUTE OF DIABETES AND DIGESTIVE AND KIDNEY DISEASES [R01DK074778] Funding Source: NIH RePORTER
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The mitochondrial life cycle consists of frequent fusion and fission events. Ample experimental and clinical data demonstrate that inhibition of either fusion or fission results in deterioration of mitochondrial bioenergetics. While fusion may benefit mitochondrial function by allowing the spreading of metabolites, protein and DNA throughout the network the functional benefit of fission is not as intuitive. Remarkably, studies that track individual mitochondria through fusion and fission found that the two events are paired and that fusion triggers fission. On average each mitochondrion would go though similar to 5 fusion:fission cycles every hour. Measurement of Delta Psi(m) during single fusion and fission events demonstrates that fission may yield uneven daughter mitochondria where the depolarized daughter is less likely to become involved in a subsequent fusion and is more likely to be targeted by autophagy. Based on these observations we propose a mechanism by which the integration of mitochondrial fusion, fission and autophagy forms a quality maintenance mechanism. According to this hypothesis pairs of fusion and fission allow for the reorganization and sequestration of damaged mitochondrial components into daughter mitochondria that are segregated from the networking pool and then becoming eliminated by autophagy. (C) 2008 Elsevier B.V. All rights reserved.
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