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• W2034985166 abstract "The cytokine interleukin-2 (IL-2) exerts numerous effects within the immune as well as the central nervous system and is thought to serve as a humoral signal in their communication. Brain-derived or blood-borne IL-2 may also control the activity of the hypothalamic-pituitary-adrenal (HPA) axis at various levels of regulation. In this study we investigated whether persistently elevated levels of central IL-2, which are associated with several diseases or induced during immunotherapeutic use of this cytokine, could induce long term activation of the HPA axis. Adult male Sprague-Dawley rats received an intracerebroventricular infusion of the recombinant cytokine at a rate of 5 U/h (equivalent to 2.5 ng/h or 162 fmol/h) by means of osmotic minipumps. Control animals received heat-inactivated IL-2. After 7 days of continuous infusion, blood samples were taken at intervals of 4 h over a period of 24 h, and plasma levels of ACTH and corticosterone (CORT) were determined. IL-2 caused a significant increase in ACTH levels during the later portion of the dark phase of the cycle. Plasma CORT concentrations were significantly elevated over almost the whole diurnal cycle. Measurements of CORT-binding globulin concentrations revealed IL-2-induced decreases during the dark phase, resulting in a marked increase in free CORT. Additionally, after 11 days of chronic infusion, both groups of animals underwent a 20-min restraint stress. IL-2-treated animals showed stress-induced increases in plasma ACTH and CORT that were not significantly different from those of animals treated with heat-inactivated IL-2. Along with the alteration of HPA activity seen in the IL-2-treated animals, chronic delivery of the cytokine caused periventricular tissue damage and gliosis. Taken together, the data reflect the capacity of IL-2 to modulate neuroendocrine activity over an extended period of treatment. Moreover, the IL-2-induced effects on HPA activity seen here may help to explain some of the endocrine disturbances seen in patients undergoing IL-2 immunotherapy." @default.
• W2034985166 created "2016-06-24" @default.
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• W2034985166 date "1994-12-01" @default.
• W2034985166 modified "2023-10-10" @default.
• W2034985166 title "Hypothalamic-pituitary-adrenal activity during chronic central administration of interleukin-2." @default.
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• W2034985166 doi "https://doi.org/10.1210/endo.135.6.7988433" @default.
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