Effects of exercise training on quadriceps muscle gene expression in chronic obstructive pulmonary disease

Shlomit Radom-Aizik, Naftali Kaminski, Shlomo Hayek, Hillel Halkin, Dan M. Cooper, Issahar Ben-Dov

Research output: Contribution to journalArticlepeer-review

Abstract

Exercise capacity and training response are limited in chronic obstructive pulmonary disease (COPD), but the extent to which this is related to altered skeletal muscle function is not fully understood. To test the hypothesis that muscle gene expression is altered in COPD, we performed needle biopsies from the vastus lateralis of six COPD patients and five sedentary age-matched healthy men, before and after 3 mo of exercise training. RNA was hybridized to Affymetrix U133A Genechip arrays. In addition, peak O2 uptake and other functional parameters (e.g., 6-min walk) were measured before and after training. The 6-min walk test increased significantly following training in both groups (53.6 ± 18.6 m in controls, P = 0.045; 37.1 ± 6.7 m in COPD, P = 0.002), but peak O2 uptake increased only in controls (19.4 ± 4.5%, P = 0.011). Training significantly altered muscle gene expression in both groups, but the number of affected genes was lower in the COPD patients (231) compared with controls (573). Genes related to energy pathways had higher expression in trained controls. In contrast, oxidative stress, ubiquitin proteasome, and COX gene pathways had higher expression in trained COPD patients, and some genes (e.g., COX11, COX15, and MAPK-9) were upregulated by training only in COPD patients. We conclude that both COPD and control subjects demonstrated functional responses to training but with somewhat different patterns in muscle gene expression. The pathways that are uniquely induced by exercise in COPD (e.g., ubiquitin proteasome and COX) might indicate a greater degree of tissue stress (perhaps by altered O2 and CO 2 dynamics) than in controls.

Original languageEnglish
Pages (from-to)1976-1984
Number of pages9
JournalJournal of Applied Physiology
Volume102
Issue number5
DOIs
StatePublished - May 2007

Keywords

  • Exercise
  • Lung disease
  • Microarray
  • Rehabilitation
  • Skeletal muscle

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