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| Research article summary (published Sep 2002): |
Influence of age, sex, and strength training on human muscle gene expression determined by microarray.
Full Abstract
The purpose of this study was to determine the influence of age, sex, and strength training (ST) on large-scale gene expression patterns in vastus lateralis muscle biopsies using high-density cDNA microarrays and quantitative PCR. Muscle samples from sedentary young (20-30 yr) and older (65-75 yr) men and women (5 per group) were obtained before and after a 9-wk unilateral heavy resistance ST program. RNA was hybridized to cDNA filter microarrays representing approximately 4,000 known human genes and comparisons were made among arrays to determine differential gene expression as a result of age and sex differences, and/or response to ST. Sex had the strongest influence on muscle gene expression, with differential expression (>1.7-fold) observed for approximately 200 genes between men and women (approximately 75% with higher expression in men). Age contributed to differential expression as well, as approximately 50 genes were identified as differentially expressed (>1.7-fold) in relation to age, representing structural, metabolic, and regulatory gene classes. Sixty-nine genes were identified as being differentially expressed (>1.7-fold) in all groups in response to ST, and the majority of these were downregulated. Quantitative PCR was employed to validate expression levels for caldesmon, SWI/SNF (BAF60b), and four-and-a-half LIM domains 1. These significant differences suggest that in the analysis of skeletal muscle gene expression issues of sex, age, and habitual physical activity must be addressed, with sex being the most critical variable.
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Author information
Author/s: Roth, Stephen M (SM); Ferrell, Robert E (RE); Peters, David G (DG); Metter, E Jeffrey (EJ); Hurley, Ben F (BF); Rogers, Marc A (MA);
Affiliation: Department of Human Genetics, Graduate School of Public Health, University of Pittsburgh, Pittsburgh, Pennsylvania 15261, USA. sroth(-atsign-)hgen.pitt.edu
Grants: AG-05893 (Agency:United States NIA) ; AG-42148 (Agency:United States NIA) ; DK-46204 (Agency:United States NIDDK)
Journal and publication information
Publication Type: Clinical Trial; Journal Article; Randomized Controlled Trial; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S.
Journal: Physiological genomics (Physiol Genomics), published in United States. (Language: eng)
Reference: 2002-Sep; vol 10 (issue 3) : pp 181-90
Dates: Created 2002/09/04; Completed 2002/11/15; Revised 2007/11/14;
PMID: 12209020, status: MEDLINE (last retrieval date: 11/6/2008)
Sourced from the National Library of Medicine. Abstract text and other information may be subject to copyright.
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