Document Detail

Prolonged moderate-intensity aerobic exercise does not alter apoptotic signaling and DNA fragmentation in human skeletal muscle.
MedLine Citation:
PMID:  19996388     Owner:  NLM     Status:  MEDLINE    
Apoptosis in skeletal muscle plays an important role in age- and disease-related tissue dysfunction. Physical activity can influence apoptotic signaling; however, this process has not been well studied in human skeletal muscle. The purpose of this study was to perform a comprehensive analysis of apoptosis-related proteins/enzymes, DNA fragmentation, and oxidative stress in skeletal muscle of humans during an acute bout of prolonged moderate-intensity exercise. Eight healthy, recreationally active individuals (age 20.8 +/- 0.5 yr, Vo(2peak) 51.2 +/- 0.9 ml . kg(-1) . min(-1), BMI 21.5 +/- 0.8 kg/m(2)) exercised on a cycle ergometer at approximately 60% Vo(2peak) for 2 h. Muscle biopsies were obtained at rest as well as at 60 and 120 min of exercise. Although exercise was associated with a significant whole body and muscle metabolic response, there were no significant changes in the content of antiapoptotic (ARC, Bcl-2, Hsp70, XIAP) and proapoptotic (AIF, Bax, Smac) proteins, activity of proteolytic enzymes (caspase-3, caspase-8, caspase-9), DNA fragmentation, or TUNEL-positive nuclei in skeletal muscle. Furthermore, the protein levels of several antioxidant enzymes (catalase, CuZnSOD, MnSOD), concentrations of GSH and GSSG, and degree of ROS generation in skeletal muscle were not altered by exercise. Fiber type-specific analysis also revealed that ARC (P < 0.001) and Hsp70 (P < 0.05) protein were significantly higher in type I compared with type IIA and type IIAX/X fibers; however, protein levels were not affected by exercise. These findings suggest that a single bout of prolonged moderate-intensity aerobic exercise is not sufficient to alter apoptotic signaling in skeletal muscle of healthy humans.
Joe Quadrilatero; Eric Bombardier; Sarah M Norris; Jason L Talanian; Matthew S Palmer; Heather M Logan; A Russell Tupling; George J F Heigenhauser; Lawrence L Spriet
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2009-12-08
Journal Detail:
Title:  American journal of physiology. Endocrinology and metabolism     Volume:  298     ISSN:  1522-1555     ISO Abbreviation:  Am. J. Physiol. Endocrinol. Metab.     Publication Date:  2010 Mar 
Date Detail:
Created Date:  2010-02-22     Completed Date:  2010-03-30     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  100901226     Medline TA:  Am J Physiol Endocrinol Metab     Country:  United States    
Other Details:
Languages:  eng     Pagination:  E534-47     Citation Subset:  IM    
Dept. of Kinesiology, Univ. of Waterloo, ON, Canada.
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MeSH Terms
Apoptosis / physiology
Apoptosis Regulatory Proteins / metabolism*
DNA Fragmentation*
Exercise / physiology*
Muscle, Skeletal / physiology*
Physical Exertion / physiology*
Signal Transduction / physiology*
Young Adult
Reg. No./Substance:
0/Apoptosis Regulatory Proteins

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