Document Detail

Effect of exercise on protein kinase C activity and localization in human skeletal muscle.
MedLine Citation:
PMID:  15604232     Owner:  NLM     Status:  MEDLINE    
To investigate the effect of exercise on protein kinase C (PKC) activity and localization in human skeletal muscle, eight healthy men performed cycle ergometer exercise for 40 min at 76 +/- 1% the peak pulmonary O(2) uptake , with muscle samples obtained at rest and after 5 and 40 min of exercise. PKC expression, phosphorylation and activities were examined by immunoblotting and in vitro kinase assays of fractionated and whole tissue preparations. In response to exercise, total PKC activity was slightly higher at 40 min in an enriched membrane fraction, and using a pSer-PKC-substrate motif antibody it was revealed that exercise increased the serine phosphorylation of an approximately 50 kDa protein. There were no changes in conventional PKC (cPKC) or PKC activities; however, atypical PKC (aPKC) activity was approximately 70% higher at 5 and 40 min, and aPKC expression and Thr(410/403) phosphorylation were unaltered by exercise. There were no effects of exercise on the abundance of PKCalpha, PKCdelta, PKC and aPKC within cytosolic or enriched membrane fractions of skeletal muscle. These data indicate that aPKC, but not cPKC or PKC, are activated by exercise in contracting muscle suggesting a potential role for aPKC in the regulation of skeletal muscle function and metabolism during exercise in humans.
Adam J Rose; Belinda J Michell; Bruce E Kemp; Mark Hargreaves
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2004-10-07
Journal Detail:
Title:  The Journal of physiology     Volume:  561     ISSN:  0022-3751     ISO Abbreviation:  J. Physiol. (Lond.)     Publication Date:  2004 Dec 
Date Detail:
Created Date:  2004-12-17     Completed Date:  2005-06-21     Revised Date:  2013-06-09    
Medline Journal Info:
Nlm Unique ID:  0266262     Medline TA:  J Physiol     Country:  England    
Other Details:
Languages:  eng     Pagination:  861-70     Citation Subset:  IM    
School of Exercise and Nutrition Sciences, Deakin University, Burwood, Victoria 3125, Australia.
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MeSH Terms
Exercise / physiology*
Gene Expression
Isoenzymes / metabolism
Muscle Proteins / metabolism
Muscle, Skeletal / enzymology*
Protein Kinase C / metabolism*
Time Factors
Reg. No./Substance:
0/Isoenzymes; 0/Muscle Proteins; EC Kinase C

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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