A stimulatory effect of interleukin-1 on adrenocortical cortisol secretion mediated by prostaglandins

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J S Winter1, K W Gow, Y S Perry

  • 1Department of Pediatrics, University of Manitoba, Winnipeg, Canada.

Endocrinology
|October 1, 1990
PubMed

Insights

Interleukin-1 (IL-1) stimulates cortisol secretion in bovine adrenal cells indirectly through prostaglandin release, despite lacking detectable IL-1 receptors. This cytokine-mediated pathway offers new insights into adrenal gland regulation.

Area of Science:

  • Endocrinology
  • Cell Biology
  • Immunology

Background:

  • Interleukin-1 (IL-1) is a cytokine involved in immune responses.
  • The role of IL-1 in adrenal steroidogenesis is not fully understood.
  • Previous studies had conflicting results regarding IL-1's effect on cortisol secretion.

Purpose of the Study:

  • To investigate the direct and indirect effects of IL-1 on cortisol secretion in cultured bovine adrenocortical cells.
  • To determine the presence of IL-1 receptors in adrenal cells.
  • To elucidate the signaling pathway involved in IL-1-induced cortisol secretion.

Main Methods:

  • Cultured bovine adrenocortical cells were treated with IL-1 alpha and IL-1 beta.
  • IL-1 receptor binding assays were performed using iodinated IL-1 alpha.
  • The effect of indomethacin on IL-1-induced cortisol secretion was assessed.
  • Prostaglandin production was measured using [3H]arachidonate conversion assays.

Main Results:

  • IL-1 alpha and IL-1 beta stimulated cortisol secretion in a dose- and time-dependent manner.
  • No detectable IL-1 receptors were found in adrenal cells.
  • Indomethacin blocked the stimulatory effect of IL-1, suggesting prostaglandin mediation.
  • IL-1 enhanced prostaglandin synthesis by adrenal cells.
  • Specific prostaglandins (PGD2, PGF2 alpha, PGE2) stimulated cortisol production.

Conclusions:

  • IL-1 stimulates cortisol secretion in bovine adrenal cells indirectly.
  • The mechanism involves the local release of prostaglandins by adrenal cells.
  • This pathway highlights a novel interaction between cytokines and the endocrine system in regulating cortisol production.

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