Document Detail


Regulation of oxidative enzyme activity and eukaryotic elongation factor 2 in human skeletal muscle: influence of gender and exercise.
MedLine Citation:
PMID:  15954989     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
AIM: To investigate gender-related differences in the responses of oxidative enzymes and eukaryotic elongation factor-2 (eEF2) to exercise. METHODS: The influence of exercise (90 min, 60%VO(2peak)) on citrate synthase (CS) and beta-hydroxyacyl-CoA dehydrogenase (HAD) activity and mRNA content, together with eEF2 expression and phosphorylation at rest, were assessed in skeletal muscle of untrained (UT) and endurance trained (ET) females and males. RESULTS: Citrate synthase and HAD mRNA were higher in females than in males (27% and 48%, respectively, P < 0.05) whereas CS and HAD activity did not differ between females and males (NS). In females only, CS activity was enhanced (P < 0.05) by 90 min exercise. Resting CS mRNA content did not differ between UT and ET but, nevertheless, CS activity was 56% higher in ET than in UT volunteers (P < 0.001). HAD mRNA and activity were not influenced by training status (NS). In UT, CS mRNA was enhanced 37% (P < 0.05) by exercise whereas exercise did not change CS mRNA in ET (NS). eEF2 expression was 31% higher (P < 0.05) and eEF2 Thr56 phosphorylation (which leads to translation inhibition) was 24% lower (P < 0.05) in females than in males. eEF2 expression and phosphorylation were unaffected by training status (NS). CONCLUSION: Basal transcriptional, translational, and/or post-translational control of CS and HAD seems to be gender-dependent. Also, gender differences in translation and/or post-translational protein modification of CS occur during exercise. Accordingly, the potential for peptide-chain elongation, based on eEF2 expression and phosphorylation, appears to be higher in females than in males.
Authors:
C Roepstorff; P Schjerling; B Vistisen; M Madsen; C H Steffensen; M H Rider; B Kiens
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Acta physiologica Scandinavica     Volume:  184     ISSN:  0001-6772     ISO Abbreviation:  Acta Physiol. Scand.     Publication Date:  2005 Jul 
Date Detail:
Created Date:  2005-06-15     Completed Date:  2005-11-14     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0370362     Medline TA:  Acta Physiol Scand     Country:  England    
Other Details:
Languages:  eng     Pagination:  215-24     Citation Subset:  IM    
Affiliation:
The Copenhagen Muscle Research Centre, Department of Human Physiology, Institute of Exercise and Sport Sciences, University of Copenhagen, Copenhagen, Denmark. croepstorff@ifi.ku.dk
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MeSH Terms
Descriptor/Qualifier:
3-Hydroxyacyl CoA Dehydrogenases / metabolism*
Adult
Citrate (si)-Synthase / metabolism*
Exercise / physiology*
Exercise Test
Female
Gene Expression Regulation / physiology
Humans
Male
Muscle, Skeletal / metabolism*
Oxidation-Reduction
Oxygen / physiology
Peptide Elongation Factor 2 / metabolism*
Phosphorylation
Physical Endurance / physiology
RNA, Messenger / analysis
Sex Factors
Chemical
Reg. No./Substance:
0/Peptide Elongation Factor 2; 0/RNA, Messenger; 7782-44-7/Oxygen; EC 1.1.1.35/3-Hydroxyacyl CoA Dehydrogenases; EC 2.3.3.1/Citrate (si)-Synthase

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