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1 Copenhagen Muscle Research Centre, The August Krogh Institute, University of Copenhagen, DK-2100 Copenhagen, Denmark; 2 Department of Physiology, University of Texas Southwestern Medical Center, Dallas, Texas 75390; and 3 John B. Pierce Laboratory and Department of Cellular and Molecular Physiology, Yale University School of Medicine, New Haven, Connecticut 06519
Exercise training elicits a
number of adaptive changes in skeletal muscle that result in an
improved metabolic efficiency. The molecular mechanisms mediating the
cellular adaptations to exercise training in human skeletal muscle are
unknown. To test the hypothesis that recovery from exercise is
associated with transcriptional activation of specific genes, six
untrained male subjects completed 60-90 min of exhaustive
one-legged knee extensor exercise for five consecutive days. On
day 5, nuclei were isolated from biopsies of the vastus
lateralis muscle of the untrained and the trained leg before exercise
and from the trained leg immediately after exercise and after 15 min,
1 h, 2 h, and 4 h of recovery. Transcriptional activity
of the uncoupling protein 3 (UCP3), pyruvate dehydrogenase kinase 4 (PDK4), and heme oxygenase-1 (HO-1) genes (relative to
-actin)
increased by three- to sevenfold in response to exercise, peaking after
1-2 h of recovery. Increases in mRNA levels followed changes in
transcription, peaking between 2 and 4 h after exercise.
Lipoprotein lipase and carnitine pamitoyltransferase I gene
transcription and mRNA levels showed similar but less dramatic induction patterns, with increases ranging from two- to threefold. In a
separate study, a single 4-h bout of cycling exercise
(n = 4) elicited from 5 to >20-fold increases in UCP3,
PDK4, and HO-1 transcription, suggesting that activation of these genes may be related to the duration or intensity of exercise. These data
demonstrate that exercise induces transient increases in transcription
of metabolic genes in human skeletal muscle. Moreover, the findings
suggest that the cumulative effects of transient increases in
transcription during recovery from consecutive bouts of exercise may
represent the underlying kinetic basis for the cellular adaptations
associated with exercise training.
metabolic genes; metabolism; messenger ribonucleic acid; training adaptation
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