Cited by 146Adipose Tissue and MetabolismMetabolism, Diabetes, and CancerPeroxisome Proliferator-Activated Receptors

Overexpression of peroxisome proliferator-activated receptor γ coactivator-1α down-regulates GLUT4 mRNA in skeletal muscles.

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Miura, Shinji, Kai, Yuko, Ono, Misaki, Ezaki, Osamu·2003·Journal of Biological Chemistry

Abstract

Exercise training increases mitochondria and GLUT4 in skeletal muscles. Recent studies indicate that an increased expression of the transcriptional coactivator peroxisome proliferator-activated receptor gamma coactivator 1alpha (PGC-1alpha) by exercise may promote mitochondrial biogenesis and fatty acid oxidation. To examine whether increased PGC-1alpha expression was also responsible for an increase of GLUT4 expression, transgenic mice that overexpress PGC-1alpha in skeletal muscles driven by a human alpha-skeletal actin promoter were made. PGC-1alpha was overexpresssed in skeletal muscles including type I and II fiber-rich muscles but not in the heart. With an increase of PGC-1alpha mRNA, type II fiber-rich muscles were redder, and genes of mitochondrial oxidative metabolism were up-regulated in skeletal muscles, whereas the expression of GLUT4 mRNA was unexpectedly down-regulated. In parallel with a decrease of GLUT4 mRNA, an impairment of glycemic control after intraperitoneal insulin administration was observed. Thus, an increase of PGC-1alpha plays a role in increasing mitochondrial biogenesis and fatty acid oxidation but not in increasing GLUT4 mRNA in skeletal muscles.

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Crossref · 10.1074/jbc.m304312200

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  • Higher levels of PGC-1α overexpression through actin promoter-driven expression in transgenic animals display a strikingly different phenotype.

    “Higher levels of overexpression of PGC-1␣ achieved through actin promoter-driven expression in transgenic animals display a strikingly different phenotype (263,264).”
  • In these animals, mitochondrial density and OXPHOS gene expression are more than double basal levels, and large increases in UCP2 gene expression are observed.

    “In these animals, mitochondrial density and OXPHOS gene expression are more than double basal levels, and large increases in UCP2 gene expression are also observed.”
  • Muscle function appears compromised in these animals, as evidenced by decreased voluntary exercise, muscle atrophy, and decreased insulin sensitivity.

    “Muscle function appears compromised, as evidenced by decreased voluntary exercise, muscle atrophy, and decreased insulin sensitivity.”
  • Mitochondrial energetics are impaired in these animals, with 60% decreases in ATP levels in muscle homogenates and concomitant increases in AMP kinase activation.

    “Mitochondrial energetics are impaired, with 60% decreases in ATP levels in muscle homogenates and concomitant increases in AMP kinase activation, probably as a compensatory response to decreased mitochondrial functionality.”
  • PGC-1α transgenic expression increases OXPHOS mRNA and protein levels, with increases ranging from 130% to 500% across transgenic models.

    “180% 1 COXIV | protein | 130% 1 mRNA | | 150 -200% | 1 mRNA | | | 150 -250% | 1 mRNA | | | | 170 -300% | 1 mRNA | 200 -500% | 1 mRNA and | protein”

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  1. Booth, F. W., and Baldwin, K. M. (1997) in Handbook of Physiology (Rowell, L., and Shephard, J. T., eds) pp. 1075-1123, Oxford University Press, New York
  2. Price, T. B., Perseghin, G., Duleba, A., Chen, W., Chase, J., Rothman, D. L., Shulman, R. G., and Shulman, G. I. (1996) Proc. Natl. Acad. Sci. U. S. A. 93, 5329 -5334
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Authors
Miura, S., Kai, Y., Ono, M., & Ezaki, O.
Affiliations
National Institute of Health and Nutrition (JP)
Corresponding author
Ezaki, Osamu
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
2003-08
Volume
278
Issue
33
Pages
31385-31390
ISSN
0021-9258 (ISSN-L)
OpenAlex
W2054885202
Cited by
146
References
28
Citations by year
2026: 1 · 2025: 2 · 2024: 6 · 2023: 6 · 2022: 3 · 2021: 5 · 2020: 5 · 2019: 9 · 2018: 5 · 2017: 11 · 2016: 1 · 2015: 12 · 2014: 9 · 2013: 9 · 2012: 5
FWCI
3.36
Type
journal article
Language
en
Open access
Locations
  • Journal of Biological Chemistry (publishedVersion, cc-by)
  • PubMed (publishedVersion)
Funders
  • Ministry of Education, Culture, Sports, Science and Technology
  • Japan Society for the Promotion of Science (14770030)
Topics
  • Health Sciences › Medicine › Physiology › Adipose Tissue and Metabolism
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Metabolism, Diabetes, and Cancer
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Peroxisome Proliferator-Activated Receptors
Keywords
PGC-1α, GLUT4, skeletal muscle, exercise training, mitochondrial biogenesis, fatty acid oxidation, transgenic mice, muscle fiber type, insulin sensitivity, glucose transport, oxidative metabolism
MeSH terms
Animals, Electron Transport, Energy Metabolism, Fatty Acids, Glucose, Humans, Insulin, Mice, Transgenic, Monosaccharide Transport Proteins, Muscle Proteins, Oxidation-Reduction, RNA, Messenger, Transcription Factors, Down-Regulation, Up-Regulation, Gene Expression, Muscle, Skeletal, Glucose Transporter Type 4, Mice

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