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  • Title: Interleukin-6 and ACTH act synergistically to stimulate the release of corticosterone from adrenal gland cells.
    Author: Salas MA, Evans SW, Levell MJ, Whicher JT.
    Journal: Clin Exp Immunol; 1990 Mar; 79(3):470-3. PubMed ID: 2156641.
    Abstract:
    We investigated whether interleukin-6 (IL-6) could cause the release of corticosterone by a direct interaction with the adrenal gland. Primary cultures of rat adrenal glands were obtained by dispersion with collagenase and incubated for 24 h with different doses of IL-6. Levels of corticosterone were measured by competitive protein binding assay. A significant (P less than 0.025) dose-dependent increase in corticosterone levels was seen at all doses used. Time course experiments demonstrated that IL-6 stimulated corticosterone release over a period of 24 h but not after 12 or 3 h. The stimulation of adrenal cells with different doses of ACTH1-24 and 40 U/ml of IL-6 showed a synergistic effect when IL-6 was combined with low concentrations of ACTH1-24 (2 and 20 pmol/l). This effect was not evident at higher doses. Our results suggest that IL-6 may act at different levels of the hypothalmic pituitary adrenal axis. Moreover the finding of a synergistic effect with ACTH1-24 indicates that IL-6 could play a role in the long term response to stress.
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