Effects of interleukin-1 beta on secretion of follicle-stimulating hormone (FSH) and luteinizing hormone (LH) by cultured rat anterior pituitary cells.
Interleukin-1 beta (IL-1 beta) at doses of 0.15 and 1.5 nM significantly inhibited FSH secretion and stimulated LH secretion by cultured rat pituitary cells after 24-72 hr incubation whereas 15 pM of IL-1 beta was not effective. Treatment with IL-1 beta for 12-48 hr did not affect intracellular content of FSH. However, treatment with 0.15 and 1.5 nM of IL-1 beta for 72 hr significantly suppressed intracellular content of FSH whereas various doses of IL-1 beta incubated with the cells for 12-72 hr showed no effect on the intracellular content of LH. Pretreatment with IL-1 beta for 48 hr inhibited both GnRH-mediated LH and FSH secretions by the pituitary. The secretion of FSH and LH mediated by an activator of protein kinase C, phorbol 12-myristate 13-acetate, was also significantly suppressed by pretreatment with IL-1 beta for 48 hr. These results suggest that (a) IL-1 beta has opposite effects on the secretion of LH and FSH and (b) pretreatment with IL-1 beta suppresses GnRH-mediated stimulation of LH and FSH by the pituitary and this suppressive effect of IL-1 beta may involve the suppression of a protein kinase C-dependent mechanism.
Murata
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Department of Anatomy and Cell Biology, University of Southern California, School of Medicine, Los Angeles 90033.
Ying
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SY
D000818:Animals; D002478:Cells, Cultured; D005260:Female; D005640:Follicle Stimulating Hormone / Q000378:metabolism*; D007987:Gonadotropin-Releasing Hormone / Q000494:pharmacology; D007375:Interleukin-1 / Q000494:pharmacology*; D007986:Luteinizing Hormone / Q000378:metabolism*; D010903:Pituitary Gland, Anterior / Q000166:cytology / Q000378:metabolism*; D011863:Radioimmunoassay; D051381:Rats; D011919:Rats, Inbred Strains; D011994:Recombinant Proteins / Q000494:pharmacology; D013755:Tetradecanoylphorbol Acetate / Q000494:pharmacology
D007375:Interleukin-1; D011994:Recombinant Proteins; D007987:Gonadotropin-Releasing Hormone; D007986:Luteinizing Hormone; D005640:Follicle Stimulating Hormone; D013755:Tetradecanoylphorbol Acetate