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Decrease in cold tolerance of aged rats caused by the enhanced endogenous adenosine activity.

L C Wang1, Z L Jin, T F Lee

  • 1Zoology Department, University of Alberta, Edmonton, Canada.

Pharmacology, Biochemistry, and Behavior
|September 1, 1992
PubMed
Summary
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Old rats struggle with cold due to lower heat production. Adenosine deaminase (AD) boosts thermogenesis, but older rats need higher doses, suggesting reduced AD activity impairs cold tolerance.

Area of Science:

  • Physiology
  • Aging Research
  • Thermogenesis

Background:

  • Aging impairs thermoregulation, with older rats showing reduced body temperature maintenance during cold exposure.
  • This deficit is linked to a lower rate of heat production in aged individuals.

Purpose of the Study:

  • To investigate the role of adenosine metabolism in age-related thermoregulatory decline.
  • To determine if adenosine deaminase (AD) activity or adenosine receptor sensitivity contributes to reduced cold tolerance in aged rats.

Main Methods:

  • Administered adenosine deaminase (AD) and adenosine receptor antagonists to young and old rats during cold exposure.
  • Measured thermogenesis and cold tolerance.
  • Assessed AD activity in neck muscle tissue.

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Main Results:

  • AD injection increased thermogenesis in both age groups, but old rats required double the dose for optimal response.
  • Adenosine receptor antagonists similarly enhanced thermogenesis and cold tolerance in young and old rats.
  • Endogenous AD activity was significantly lower in old rats' neck muscle compared to young rats.

Conclusions:

  • Reduced cold tolerance in aged rats is likely due to increased adenosine stimulation from decreased endogenous AD activity, not altered receptor sensitivity.
  • Restoring AD activity may be a therapeutic strategy to improve thermoregulation in aging individuals.