Journal of Clinical Endocrinology & Metabolism, Vol 69, 1200-1206, Copyright © 1989 by Endocrine Society

ARTICLES

Progesterone and estradiol modulate interleukin-1 beta messenger ribonucleic acid levels in cultured human peripheral monocytes

ML Polan, J Loukides, P Nelson, S Carding, M Diamond, A Walsh and K Bottomly
Department of Obstetrics and Gynecology, Howard Hughes Medical Institute, Yale University School of Medicine, New Haven, Connecticut 06510.

The relationship between the endocrine system and immune monokines, such as interleukin-1 (IL-1), is of increasing interest. IL-1, a protein secreted by peripheral monocytes and tissue macrophages, mediates a wide variety of immune responses, and its production appears to be inversely related to the level of gonadal steroids. In this report, we have investigated the relationship between estradiol and progesterone concentrations and the level of IL-1 beta mRNA in cultured human peripheral monocytes and pelvic macrophages. Human peripheral monocytes, isolated during the luteal phase of the menstrual cycle, were activated with lipopolysaccharide (10 micrograms/mL). Cellular RNA was isolated and analyzed by Northern analysis using an 800-basepair IL- 1 beta cDNA probe. Hybridization with 32P-labeled probe showed maximal levels of IL-1 beta mRNA occurring between 3 and 7 h of culture. Cultures of lipopolysaccharide-activated human peripheral monocytes incubated for 3-6 h with increasing amounts of progesterone or estradiol (0-10(-5) M) in the presence of either 5% fetal calf serum or 0.1% BSA demonstrated an inverse relationship between IL-1 beta mRNA levels and steroid concentration. In both cases, IL-1 beta mRNA levels decreased by 80-90% as the progesterone concentration increased to 10(- 5) M and by 70-90% as the estradiol concentration increased similarly. A similar 80% decrease in IL-1 beta mRNA was observed with peritoneal macrophages incubated with increasing amounts of progesterone. This reciprocal relationship between IL-1 beta mRNA and gonadal steroids may have important ramifications in reproductive biology for both embryonic implantation and fetal survival as well as for clinically relevant changes in bone mass.

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