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Related Experiment Videos

Aging changes tissue-specific glucose metabolism in rats.

J Higgins1, D Proctor, G Denyer

  • 1Center for Human Nutrition, University of Colorado Health Sciences Center, Denver 80262, USA.

Metabolism: Clinical and Experimental
|December 3, 1999
PubMed
Summary

Glucose metabolism shifts in rats before insulin resistance develops. Adipose tissue compensates for reduced glucose flux in other organs, potentially explaining age-related insulin resistance.

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Area of Science:

  • Metabolic studies
  • Physiology
  • Endocrinology

Background:

  • Insulin resistance is a major metabolic disorder.
  • Age is a significant risk factor for insulin resistance.
  • Understanding early metabolic changes is crucial for prevention.

Purpose of the Study:

  • To investigate tissue-specific glucose metabolic flux changes over time in rats.
  • To identify alterations preceding whole-body insulin resistance.
  • To explore the role of adipose tissue in metabolic compensation.

Main Methods:

  • Rats fed a high-carbohydrate diet for 12 or 26 weeks.
  • Euglycemic clamps performed at basal and mid-physiological insulin levels.
  • Assay of glucose uptake, glycogenesis, and lipogenesis in excised tissues.

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Main Results:

  • Glycogenesis reduced in most tissues by 32 weeks, except adipose tissue.
  • Liver glycogenesis significantly decreased from 18 to 32 weeks.
  • White adipose tissue (WAT) glucose uptake and brown adipose tissue (BAT) lipogenesis increased, compensating for reduced whole-body glucose disposal.

Conclusions:

  • Tissue-specific metabolic adaptations occur before overt insulin resistance.
  • Adipose tissue plays a compensatory role in maintaining glucose homeostasis.
  • Altered insulin responsiveness in adipose tissue may contribute to age-related insulin resistance.