Autophagy is induced by resistance exercise in young men but unfolded protein response is induced regardless of age
Hentilä, J., Ahtiainen, J., Paulsen, G., Raastad, T., Häkkinen, K., Mero, A., & Hulmi, J. (2018). Autophagy is induced by resistance exercise in young men but unfolded protein response is induced regardless of age. Acta Physiologica, 224(1), Article e13069. https://doi.org/10.1111/apha.13069
Published inActa Physiologica
DisciplineLiikuntafysiologiaValmennus- ja testausoppiExercise PhysiologyScience of Sport Coaching and Fitness Testing
© 2018 Scandinavian Physiological Society.
Aim Autophagy and unfolded protein response (UPR) appear to be important for skeletal muscle homoeostasis and may be altered by exercise. Our aim was to investigate the effects of resistance exercise and training on indicators of UPR and autophagy in healthy untrained young men (n = 12, 27 ± 4 years) and older men (n = 8, 61 ± 6 years) as well as in resistance‐trained individuals (n = 15, 25 ± 5 years). Methods Indicators of autophagy and UPR were investigated from the muscle biopsies after a single resistance exercise bout and after 21 weeks of resistance training. Results Lipidated LC3II as an indicator of autophagosome content increased at 48 hours post‐resistance exercise (P < .05) and after a resistance training period (P < .01) in untrained young men but not in older men. Several UPRER markers, typically induced by protein misfolding in endoplasmic reticulum, were increased at 48 hours post‐resistance exercise in untrained young and older men (P < .05) but were unaltered after the 21‐week resistance training period regardless of age. UPR was unchanged within the first few hours after the resistance exercise bout regardless of the training status. Changes in autophagy and UPRER indicators did not correlate with a resistance training‐induced increase in muscle strength and size. Conclusion Autophagosome content is increased by resistance training in young previously untrained men, but this response may be blunted by ageing. However, unfolded protein response is induced by an unaccustomed resistance exercise bout in a delayed manner regardless of age. ...
PublisherWiley-Blackwell Publishing Ltd.
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- Liikuntatieteiden tiedekunta 
Related funder(s)Academy of Finland
Funding program(s)Research post as Academy Research Fellow, AoF
Additional information about fundingThe Finnish Ministry of Education (to AAM), Academy of Finland (grant No. 275922 to JJH) and Finnish Cultural Foundation (JH personal grant) supported this research.
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