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Cited by 270

The DOI matches its Crossref record; 3 of the 3 references it cites were found in a registry or an index.

PGC-1α mRNA expression is influenced by metabolic perturbation in exercising human skeletal muscle

Norrbom, Jessica, Sundberg, Carl Johan, Ameln, Helene, Kraus, William E., Jansson, Eva, Gustafsson, Thomas·2004·Journal of Applied Physiology

Abstract

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 1α (PGC-1α)/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-1α, and downstream mitochondrial transcription factors. A novel finding was that, in human skeletal muscle, PGC-1α 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-1α 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.

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Metadata

Authors
Norrbom, J., Sundberg, C. J., Ameln, H., Kraus, W. E., Jansson, E., & Gustafsson, T.
Venue
Journal of Applied Physiology
Published
2004-01
Volume
96
Issue
1
Pages
189-194
ISSN
  • 0161-7567 (ISSN-L)
  • 8750-7587
  • 1522-1601
OpenAlex
W2116545115
Cited by
270
References
3
FWCI
43.59
Type
journal article
Language
en
Open access
closed

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