Training state and skeletal muscle autophagy in response to 36 h of fasting

Publikation: Bidrag til tidsskriftTidsskriftartikelfagfællebedømt

The present study aimed at investigating fasting-induced responses in regulators and markers of autophagy in vastus lateralis muscle from untrained and trained human subjects. Untrained and trained subjects (based on maximum oxygen uptake, muscle citrate synthase activity, and oxidative phosphorylation protein level) fasted for 36 h with vastus lateralis muscle biopsies obtained at 2, 12, 24, and 36 h after a standardized meal. Fasting reduced (P 0.05) skeletal muscle microtubule-associated protein-1A/1B light chain 3 (LC3)I, LC3II, and adaptor protein sequestosome 1/p62 protein content in untrained subjects only. Moreover, skeletal muscle RAC-alpha serine/threonine-protein kinase (AKT) Thr308, AMP-activated protein kinase (AMPK) Thr172, and Unc-51-like autophagy-activating kinase-1 (ULK1) Ser555 phosphorylation state, as well as Bcl-2-interacting coiled-coil protein-1 (Beclin1) and ULK1 Ser757 phosphorylation, was lower (P 0.05) in trained than untrained subjects during fasting. In addition, the plasma concentrations of several amino acids were higher (P 0.05) in trained than untrained subjects, and the plasma concentration profile of several amino acids was different in untrained and trained subjects during fasting. Taken together, these findings suggest that 36-h fasting has effects on some mediators of autophagy in untrained human skeletal muscle and that training state influences the effect of fasting on autophagy signaling and on mediators of autophagy in skeletal muscle. NEW & NOTEWORTHY This study showed that skeletal muscle autophagy was only modestly affected in humans by 36 h of fasting. Hence, 36-h fasting has effects on some mediators of autophagy in untrained human skeletal muscle, and training state influences the effect of fasting on autophagy signaling and on mediators of autophagy in skeletal muscle.

OriginalsprogEngelsk
TidsskriftJournal of Applied Physiology
Vol/bind125
Udgave nummer5
Sider (fra-til)1609-1619
Antal sider11
ISSN8750-7587
DOI
StatusUdgivet - nov. 2018

Bibliografisk note

CURIS 2018 NEXS 406

ID: 201903004