Omega-3 supplementation alters mitochondrial membrane composition and respiration kinetics in human skeletal muscle

Journal article


Herbst, E. A. F., Paglialunga, S., Gerling, C., Whitfield, Jamie, Mukai, K., Chabowski, Adrian, Heigenhauser, G. J. F., Spriet, L. L. and Holloway, Graham P.. (2014) Omega-3 supplementation alters mitochondrial membrane composition and respiration kinetics in human skeletal muscle. The Journal of Physiology. 592(6), pp. 1341 - 1352. https://doi.org/10.1113/jphysiol.2013.267336
AuthorsHerbst, E. A. F., Paglialunga, S., Gerling, C., Whitfield, Jamie, Mukai, K., Chabowski, Adrian, Heigenhauser, G. J. F., Spriet, L. L. and Holloway, Graham P.
Abstract

Studies have shown increased incorporation of omega-3 fatty acids into whole skeletal muscle following supplementation, although little has been done to investigate the potential impact on the fatty acid composition of mitochondrial membranes and the functional consequences on mitochondrial bioenergetics. Therefore, we supplemented young healthy male subjects ( n = 18 ) with fish oils [2 g eicosapentaenoic acid ( EPA ) and 1 g docosahexanoic acid ( DHA ) per day] for 12 weeks and skeletal muscle biopsies were taken prior to ( Pre ) and following ( Post ) supplementation for the analysis of mitochondrial membrane phospholipid composition and various assessments of mitochondrial bioenergetics. Total EPA and DHA content in mitochondrial membranes increased ( P < 0.05 ) ∼450 and ∼320%, respectively, and displaced some omega-6 species in several phospholipid populations. Mitochondrial respiration, determined in permeabilized muscle fibres, demonstrated no change in maximal substrate-supported respiration, or in the sensitivity ( apparent Km ) and maximal capacity for pyruvate-supported respiration. In contrast, mitochondrial responses during ADP titrations demonstrated an enhanced ADP sensitivity ( decreased apparent Km ) that was independent of the creatine kinase shuttle. As the content of ANT1, ANT2, and subunits of the electron transport chain were unaltered by supplementation, these data suggest that prolonged omega-3 intake improves ADP kinetics in human skeletal muscle mitochondria through alterations in membrane structure and/or post-translational modification of ATP synthase and ANT isoforms. Omega-3 supplementation also increased the capacity for mitochondrial reactive oxygen species emission without altering the content of oxidative products, suggesting the absence of oxidative damage. The current data strongly emphasize a role for omega-3s in reorganizing the composition of mitochondrial membranes while promoting improvements in ADP sensitivity.

Year2014
JournalThe Journal of Physiology
Journal citation592 (6), pp. 1341 - 1352
PublisherWiley-Blackwell Publishing Ltd.
ISSN0022-3751
Digital Object Identifier (DOI)https://doi.org/10.1113/jphysiol.2013.267336
Scopus EID2-s2.0-84896048455
Page range1341 - 1352
Research GroupMary MacKillop Institute for Health Research
Publisher's version
File Access Level
Controlled
Place of publicationUnited Kingdom
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