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Effects of glucocorticoids and chronic inflammatory stress upon anterior pituitary interleukin-6 mRNA expression in the rat.

During development of adjuvant arthritis (AA) in the rat, anterior pituitary interleukin-6 (IL-6) mRNA expression was increased. Following adrenalectomy and AA there was a further increase in the accumulation of pituitary IL-6 transcript. Corticosterone (B) replacement in adrenalectomized (ADX) animals resulted in a dose-dependent reduction in pituitary IL-6 mRNA accumulation, while in ADX plus AA animals these effects of B were less marked. Cyclosporine A (CsA) markedly reduced the AA-induced increase in IL-6 mRNA. These data are consistent with an immunologically-mediated activation of pituitary IL-6 mRNA in AA, which may contribute to the increased activity of the pituitary-adrenal axis seen in this condition.