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mRNA expression is influenced by metabolic perturbation in exercising human skeletal muscle
1Department of Physiology and Pharmacology, Section of Molecular Exercise Physiology, 2Department of Laboratory Medicine, Division of Clinical Physiology, Huddinge University Hospital, 3Department of Cell and Molecular Biology, Karolinska Institutet, 171 77 Stockholm, Sweden; and 4Department of Medicine, Duke University, Durham, North Carolina 27708
Submitted 23 July 2003 ; accepted in final form 9 September 2003
Endurance training leads to many adaptational changes in several tissues. In skeletal muscle, fatty acid usage is enhanced and mitochondrial content is increased. The exact molecular mechanisms regulating these functional and structural changes remain to be elucidated. Contractile activity-induced metabolic perturbation has repeatedly been shown to be important for the induction of mitochondrial biogenesis. Recent reports suggest that the peroxisome proliferator-activated receptor gamma coactivator 1
(PGC-1)/mitochondrial transcription factor A (Tfam) pathway is involved in exercise-induced mitochondrial biogenesis. In the present study, nine healthy men performed two 45-min bouts of one-legged knee extension exercise: one bout with restricted blood flow, and the other with nonrestricted blood flow to the working muscle. Muscle biopsies were obtained from the vastus lateralis muscle before exercise and at 0, 30, 120, and 360 min after the exercise bout. Biopsies were analyzed for whole muscle, as well as fiber-type specific mRNA expression of myocyte-enriched calcineurin interacting protein (MCIP)-1, PGC-1, and downstream mitochondrial transcription factors. A novel finding was that, in human skeletal muscle, PGC-1 mRNA increased more after exercise with restricted blood flow than in the nonrestricted condition. No changes were observed for the mRNA of NRF-1, Tfam, mitochondrial transcription factor B1, and mitochondrial transcription factor B2. Muscle fiber type I and type II did not differ in the basal PGC-1 mRNA levels or in the expression increase after ischemic training. Another novel finding was that there was no difference between the restricted and nonrestricted exercise conditions in the increase of MCIP-1 mRNA, a marker for calcineurin activation. This suggests that calcineurin may be activated by exercise in humans and does not exclude that calcineurin could play a role in PGC-1 transcription activation in human skeletal muscle.
gene expression; ischemia; monocyte-enriched calcineurin interacting protein-1; mitochondria; muscle biopsies
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