Journal
JOURNAL OF CELLULAR PHYSIOLOGY
Volume 233, Issue 10, Pages 6329-6336Publisher
WILEY
DOI: 10.1002/jcp.26594
Keywords
AMPK; autophagy; endplate structure; hindlimb suspension; skeletal muscle
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Funding
- Swedish Research Council [K2013-55X-14191-12-3]
- Novo Nordisk Foundation
- Russian Foundation for Basic Research [16-04-00562]
- Strategic Research Program in Diabetes at Karolinska Institutet
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Motor endplates naturally undergo continual morphological changes that are altered in response to changes in neuromuscular activity. This study examines the consequences of acute (6-12hr) disuse following hindlimb suspension on rat soleus muscle endplate structural stability. We identify early changes in several key signaling events including markers of protein kinase activation, AMPK phosphorylation and autophagy markers which may play a role in endplate remodeling. Acute disuse does not change endplate fragmentation, however, it decreases both the individual fragments and the total endplate area. This decrease was accompanied by an increase in the mean fluorescence intensity from the nicotinic acetylcholine receptors which compensate the endplate area loss. Muscle disuse decreased phosphorylation of AMPK and its substrate ACC, and stimulated mTOR controlled protein synthesis pathway and stimulated autophagy. Our findings provide evidence that changes in endplate stability are accompanied by reduced AMPK phosphorylation and an increase in autophagy markers, and these changes are evident within hours of onset of skeletal muscle disuse.
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