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Sci Rep. 2017 Jul 10;7(1):5028. doi: 10.1038/s41598-017-05483-x.

Resistance exercise initiates mechanistic target of rapamycin (mTOR) translocation and protein complex co-localisation in human skeletal muscle.

Author information

1
School of Sport, Exercise and Rehabilitation Sciences, University of Birmingham, England, UK.
2
Faculty of Kinesiology and Physical Education, University of Toronto, Toronto, Canada.
3
Human Health and Nutritional Sciences, University of Guelph, Guelph, Canada.
4
Institute of Cancer and Genomic Sciences, University of Birmingham, England, UK.
5
Institute of Inflammation and Ageing, University of Birmingham, England, UK.
6
School of Sport, University of Stirling, Scotland, UK.
7
Institut NeuroMyoGene (INMG), University Lyon 1, INSERM U 1217, Lyon, France.
8
Department of Comparative Biosciences, The University of Wisconsin, Madison, USA.
9
Department of Medicine, McMaster University, Hamilton, Canada.
10
School of Sport, Exercise and Rehabilitation Sciences, University of Birmingham, England, UK. a.philp@bham.ac.uk.

Abstract

The mechanistic target of rapamycin (mTOR) is a central mediator of protein synthesis in skeletal muscle. We utilized immunofluorescence approaches to study mTOR cellular distribution and protein-protein co-localisation in human skeletal muscle in the basal state as well as immediately, 1 and 3 h after an acute bout of resistance exercise in a fed (FED; 20 g Protein/40 g carbohydrate/1 g fat) or energy-free control (CON) state. mTOR and the lysosomal protein LAMP2 were highly co-localised in basal samples. Resistance exercise resulted in rapid translocation of mTOR/LAMP2 towards the cell membrane. Concurrently, resistance exercise led to the dissociation of TSC2 from Rheb and increased in the co-localisation of mTOR and Rheb post exercise in both FED and CON. In addition, mTOR co-localised with Eukaryotic translation initiation factor 3 subunit F (eIF3F) at the cell membrane post-exercise in both groups, with the response significantly greater at 1 h of recovery in the FED compared to CON. Collectively our data demonstrate that cellular trafficking of mTOR occurs in human muscle in response to an anabolic stimulus, events that appear to be primarily influenced by muscle contraction. The translocation and association of mTOR with positive regulators (i.e. Rheb and eIF3F) is consistent with an enhanced mRNA translational capacity after resistance exercise.

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