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High levels of physical activity in later life are associated with enhanced markers of mitochondrial metabolism

Research output: Contribution to journalArticle

Sophie Joanisse, Stephen Ashcroft, Daniel J Wilkinson, Ross D Pollock, Katie A O'Brien, Bethan E Phillips, Ken Smith, Norman R Lazarus, Stephen Harridge, Philip J Atherton, Andrew Philp

Original languageEnglish
Pages (from-to)1481-1487
Number of pages7
JournalThe journals of gerontology. Series A, Biological sciences and medical sciences
Volume75
Issue number8
Early online date14 Jan 2020
DOIs
E-pub ahead of print14 Jan 2020
Published13 Jul 2020

Bibliographical note

© The Author(s) 2020. Published by Oxford University Press on behalf of The Gerontological Society of America. All rights reserved. For permissions, please e-mail: journals.permissions@oup.com.

King's Authors

Abstract

The age-associated reduction in muscle mass is well characterized; however, less is known regarding the mechanisms responsible for the decline in oxidative capacity also observed with advancing age. The purpose of the current study was therefore to compare mitochondrial gene expression and protein content between young and old recreationally active, and older highly active individuals. Muscle biopsies were obtained from the vastus lateralis of young males (YG: 22 ± 3 years) and older (OG: 67 ± 2 years) males not previously engaged in formal exercise and older male master cyclists (OT: 65 ± 5 years) who had undertaken cycling exercise for 32 ± 17 years. Comparison of gene expression between YG, OG, and OT groups revealed greater expression of mitochondrial-related genes, namely, electron transport chain (ETC) complexes II, III, and IV (p < .05) in OT compared with YG and OG. Gene expression of mitofusion (MFN)-1/2, mitochondrial fusion genes, was greater in OT compared with OG (p < .05). Similarly, protein content of ETC complexes I, II, and IV was significantly greater in OT compared with both YG and OG (p < .001). Protein content of peroxisome proliferator-activated receptor gamma, coactivator 1 α (PGC-1α), was greater in OT compared with YG and OG (p < .001). Our results suggest that the aging process per se is not associated with a decline in gene expression and protein content of ETC complexes. Mitochondrial-related gene expression and protein content are substantially greater in OT, suggesting that exercise-mediated increases in mitochondrial content can be maintained into later life.

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