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Phasic hyperactivity of the HPA axis resulting from chronic central IL-2 administration

Phasic hyperactivity of the HPA axis resulting from chronic central IL-2 administration

Neuroreport 7(18): 2883-2888

Intracerebroventricular infusion of interleukin-2 (IL-2, 15 U h-1 for 14 days) chronically activated the hypothalamic-pituitary-adrenocortical (HPA) axis in rats. IL-2 induced increases in plasma levels of adrenocorticotropic hormone (ACTH, up to two-fold) and corticosterone (up to four-fold) compared with controls. Continuously elevated brain levels of IL-2 did not lead to a persistent HPA activation, but resulted in (two) periods of hormonal hypersecretion. ACTH and corticosterone levels were elevated between days 3 and 5, with changes in corticosterone preceding those of ACTH. Concentrations of corticosterone, but not of ACTH, increased again on day 11. Underscoring its importance as a neuroendocrine regulator, this study reveals that, in addition to its immediate effects, IL-2 induces a complex pattern of chronic HPA stimulation. These findings may functionally relate to several CNS disorders and certain endocrine dysfunctions observed during IL-2 immunotherapy.

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Accession: 046973018

Download citation: RISBibTeXText

PMID: 9116202

DOI: 10.1097/00001756-199611250-00015

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