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Endocrinology, Vol 131, 677-683, Copyright © 1992 by Endocrine Society

ARTICLES

Interleukin-2 induces corticotropin-releasing hormone release from superfused rat hypothalami: influence of glucocorticoids

JC Cambronero, FJ Rivas, J Borrell and C Guaza
Cajal Institute, Consejo Superior de Investigaciones Cientificas, Madrid, Spain.

The present work shows that interleukin-2 (IL-2) is able to increase in a dose-dependent manner (25-100 U/ml) CRF release from continuous perifused hypothalami. The effects of IL-2 and IL-1 on CRF secretion are potentiated by the simultaneous action of the two cytokines at the hypothalamus. The stimulatory effect of IL-2 on CRF secretion is significantly inhibited by the presence of dexamethasone in the perifusion medium. However, the CRF response to IL-2 was similar in adrenalectomized animals and sham-operated rats. It is suggested that the action of IL-2 on hypothalamic CRF secretion is integrated in the communication between the immune system and the hypothalamic-pituitary- adrenocortical axis, and that such action is subjected to glucocorticoid negative feedback modulation. The mechanism underlying the effect of IL-2 on CRF release is unknown, but arachidonic acid metabolites do not seem to be involved, since neither a lipooxygenase (nordihidrogueretic acid) nor a cyclooxigenase (indomethacin) inhibitor affected the hypothalamic secretory response to IL-2.




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Copyright © 1992 by The Endocrine Society