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Related Experiment Videos

Interspecies variations of corticosteroid-binding globulin parameters

V Gayrard1, M Alvinerie, P L Toutain

  • 1Ecole Nationale Vétérinaire de Toulouse Unité associée INRA de Physiopathologie et Toxicologie expérimentales 23 chemin des Capelles, France.

Domestic Animal Endocrinology
|January 1, 1996
PubMed
Summary

Cortisol binding to corticosteroid-binding globulin (CBG) varies across species. Most mammals have ample free CBG, suggesting a role beyond simple cortisol transport, potentially in hormone delivery.

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Area of Science:

  • Comparative Endocrinology
  • Biochemistry
  • Physiology

Background:

  • Cortisol, a key stress hormone, circulates in mammalian plasma primarily bound to corticosteroid-binding globulin (CBG).
  • Understanding cortisol-CBG interactions is crucial for interpreting hormonal status and physiological responses across species.

Purpose of the Study:

  • To investigate and compare cortisol protein binding by CBG in seven mammalian species.
  • To determine the capacity and affinity of CBG for cortisol and its implications for free cortisol levels.

Main Methods:

  • Equilibrium dialysis was employed to measure cortisol binding to plasma proteins.
  • Cortisol concentrations, CBG maximal capacity (Bmax), and dissociation constant (Kd) were quantified.
  • Calculations of free, CBG-bound, and albumin-bound cortisol fractions were performed.

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Main Results:

  • Cortisol binding to CBG was not observed in squirrel monkeys; other species showed significant binding.
  • CBG maximal capacity (Bmax) exceeded plasma cortisol levels across species, with variations noted.
  • A linear relationship between Bmax and Kd was found; a substantial portion of CBG remained unbound under physiological conditions.

Conclusions:

  • Mammalian species exhibit diverse patterns of cortisol-CBG binding.
  • The significant amount of free CBG suggests roles beyond simple cortisol transport, possibly in hormone signaling or local delivery.
  • Findings challenge existing theories and highlight the complexity of cortisol regulation and action.