Impact of resistance exercise on ribosome biogenesis is acutely regulated by post-exercise recovery strategies

Figueiredo, Vandre C., Roberts, Llion A., Markworth, James F., Barnett, Matthew P.G., Coombes, Jeff S., Raastad, Truls, Peake, Jonathan M., & Cameron-Smith, David (2016) Impact of resistance exercise on ribosome biogenesis is acutely regulated by post-exercise recovery strategies. Physiological Reports, 4(2), Article Number:-e12670.

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Muscle hypertrophy occurs following increased protein synthesis, which requires activation of the ribosomal complex. Additionally, increased translational capacity via elevated ribosomal RNA (rRNA) synthesis has also been implicated in resistance training-induced skeletal muscle hypertrophy. The time course of ribosome biogenesis following resistance exercise (RE) and the impact exerted by differing recovery strategies remains unknown. In the present study, the activation of transcriptional regulators, the expression levels of pre-rRNA, and mature rRNA components were measured through 48 h after a single-bout RE. In addition, the effects of either low-intensity cycling (active recovery, ACT) or a cold-water immersion (CWI) recovery strategy were compared. Nine male subjects performed two bouts of high-load RE randomized to be followed by 10 min of either ACT or CWI. Muscle biopsies were collected before RE and at 2, 24, and 48 h after RE. RE increased the phosphorylation of the p38-MNK1-eIF4E axis, an effect only evident with ACT recovery. Downstream, cyclin D1 protein, total eIF4E, upstream binding factor 1 (UBF1), and c-Myc proteins were all increased only after RE with ACT. This corresponded with elevated abundance of the pre-rRNAs (45S, ITS-28S, ITS-5.8S, and ETS-18S) from 24 h after RE with ACT. In conclusion, coordinated upstream signaling and activation of transcriptional factors stimulated pre-rRNA expression after RE. CWI, as a recovery strategy, markedly blunted these events, suggesting that suppressed ribosome biogenesis may be one factor contributing to the impaired hypertrophic response observed when CWI is used regularly after exercise.

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ID Code: 94461
Item Type: Journal Article
Refereed: Yes
Keywords: exercise, muscle, recovery, cold water immersion, ribosomal biogenesis
DOI: 10.14814/phy2.12670
ISSN: 2051-817X
Divisions: Current > Schools > School of Biomedical Sciences
Current > QUT Faculties and Divisions > Faculty of Health
Current > Institutes > Institute of Health and Biomedical Innovation
Copyright Owner: 2016 The Authors. Physiological Reports published by Wiley Periodicals, Inc. on behalf of
the American Physiological Society and The Physiological Society.
Copyright Statement: This is an open access article under the terms of the Creative Commons Attribution License,
which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
Deposited On: 06 Apr 2016 00:06
Last Modified: 14 Apr 2016 15:48

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