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Mitophagy Regulation in Skeletal Muscle: Effect of Endurance Exercise and Age

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Abstract

Mitochondria are essential energy-providing organelles that are required in the maintenance of healthy skeletal muscle. As such, the removal of damaged mitochondria, through mitophagy, is necessary to maintain mitochondrial quality. In aging muscle, mitochondrial content and function are often found to be reduced compared to young individuals. This occurs despite the fact that measures of mitophagy are elevated, suggesting that mitophagy is insufficiently high to remove all of the dysfunctional organelles in aging muscle. Recent evidence has shown that acute exercise promotes mitophagic signaling, leading to organelle degradation. This exercise-induced signaling is attenuated in aging muscle, suggesting that aging muscle loses its capacity for mitochondrial turnover in response to exercise. This contributes to the reduction in muscle health in elderly individuals. Chronic exercise training improves mitochondrial content and function, even in aging muscle, leading to reduced mitophagy signaling. Thus, exercise training should be prescribed for both young and elderly populations to promote the maintenance of a healthy mitochondrial pool, through the stimulation of both organelle biogenesis and mitophagy.

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Abbreviations

AMP:

Adenosine monophosphate

AMPK:

AMP-activated protein kinase

LC3:

Microtubule-associated proteins 1A/1B light chain 3A

LAMP 1/2:

Lysosomal-associated membrane proteins 1 and 2

MIT/TFE:

Microthalmia-transcription factor E

mTORC1:

Mammalian/mechanistic target of rapamycin complex 1

NUGEMP:

Nuclear gene-encoded mitochondrial protein

PGC-1α:

Peroxisome proliferator activator receptor (PPAR) coactivator 1 alpha

PINK1:

PTEN-induced putative kinase 1

p38MAPK:

p38 mitogen-activated protein kinase

TFEB:

Transcription factor EB

ULK1:

Serine/threonine protein kinase

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  1. Muscle Health Research Centre, School of Kinesiology and Health Science, York University, 4700 Keele St, Toronto, ON, M3J 1P3, Canada

    Avigail T. Erlich & David A. Hood

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Erlich, A.T., Hood, D.A. Mitophagy Regulation in Skeletal Muscle: Effect of Endurance Exercise and Age. J. of SCI. IN SPORT AND EXERCISE 1, 228–236 (2019). https://doi.org/10.1007/s42978-019-00041-5

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