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Corticosterone's dual metabolic actions.

L Devenport1, A Knehans, A Sundstrom

  • 1Department of Psychology, University of Oklahoma, Norman 73019.

Life Sciences
|January 1, 1989
PubMed
Summary

Corticosterone has dual metabolic effects, acting as anabolic at low doses and catabolic at high doses. These actions depend on binding to type I and type II corticosteroid receptors, influencing body composition.

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Area of Science:

  • Metabolic regulation
  • Endocrinology
  • Body composition

Background:

  • Corticosterone is a key glucocorticoid hormone.
  • Its metabolic effects are complex and not fully understood.
  • Dose-dependent actions are suspected but require detailed investigation.

Purpose of the Study:

  • To elucidate the dose-dependent metabolic actions of corticosterone.
  • To investigate the roles of type I and type II corticosteroid receptors.
  • To determine the impact on body weight, feeding efficiency, and body composition.

Main Methods:

  • Continuous infusion studies in animal models.
  • Administration of corticosterone and specific receptor agonists (aldosterone, RU28362, dexamethasone).
  • Measurement of body weight gain, feeding efficiency, and carcass composition (fat and lean mass).

Main Results:

  • Corticosterone exhibited a bitonic dose-response curve for body weight gain and feeding efficiency.
  • Low corticosterone levels were anabolic, while levels above 2 µg/dl induced catabolism.
  • Type I and type II receptor agonists produced opposing monotonic dose-response curves.
  • Stimulation of type I receptors increased carcass lipids; type II stimulation reduced protein.

Conclusions:

  • Corticosterone's metabolic actions are dose-dependent and mediated by type I and type II receptors.
  • Low-dose corticosterone promotes anabolism, while high-dose corticosterone induces catabolism.
  • Differential receptor activation leads to distinct changes in body fat and lean mass proportions.

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