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Related Experiment Videos

Expression of glucose transporter isoforms with aging.

Y Oka1, T Asano, J L Lin

  • 1Third Department of Internal Medicine, Faculty of Medicine, University of Tokyo, Japan.

Gerontology
|January 1, 1992
PubMed
Summary

Aging impairs glucose metabolism by altering glucose transporter expression. Aged rats showed decreased GLUT4 glucose transporter protein and mRNA in fat tissue, and reduced GLUT4 protein efficiency in muscle.

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Area of Science:

  • Cellular and Molecular Biology
  • Metabolic Research
  • Aging Studies

Background:

  • Glucose metabolism is crucial for cellular energy production.
  • Aging is often associated with impaired glucose homeostasis.
  • Facilitative glucose transporters play a key role in regulating glucose uptake.

Purpose of the Study:

  • To investigate the cellular mechanisms underlying age-related glucose metabolism impairment.
  • To examine changes in glucose transporter (GLUT) protein and mRNA expression in aging rats.
  • To determine tissue-specific and isoform-specific alterations in glucose transporters during aging.

Main Methods:

  • Comparison of GLUT4 and GLUT1 glucose transporter protein and mRNA levels.
  • Analysis in various tissues (epididymal fat, skeletal muscle, brain) of young and aged rats.

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  • Assessment of protein synthesis, stability, and translational efficiency.

    • Main Results:

    • GLUT4 glucose transporter protein and mRNA were selectively decreased in the epididymal fat of aged rats, suggesting reduced synthesis.
    • GLUT4 mRNA increased in skeletal muscle of aged rats, but protein levels decreased, indicating reduced translational efficiency or protein stability.
    • GLUT1 glucose transporter protein levels remained unchanged in fat, skeletal muscle, and brain of aged rats.

    Conclusions:

    • Tissue- and isoform-specific alterations in glucose transporter expression are linked to aging.
    • These changes in GLUT4 expression likely contribute to the impaired glucose metabolism observed in aging.
    • Understanding these mechanisms can inform strategies to address age-related metabolic dysfunction.