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Journal of Clinical Endocrinology & Metabolism, Vol 75, 1230-1234, Copyright © 1992 by Endocrine Society

ARTICLES

Synthesis and release of endothelin-1 by human decidual cells

T Kubota, S Kamada, Y Hirata, S Eguchi, T Imai, F Marumo and T Aso
Department of Obstetrics and Gynecology, Tokyo Medical and Dental University, Faculty of Medicine, Japan.

We have studied whether a novel vasoconstrictor, endothelin-1 (ET-1), is synthesized by and released from human decidual cells in early pregnancy, and whether ET-1 acts directly on their own cells. It was observed that ET-1-like immunoreactivity (ET-1-LI) was released from cultured decidual, but not villous, cells, as a function of time. Reverse-phase high-pressure liquid chromatography of the conditioned media from the decidual cells revealed a major peak of ET-1-LI coeluting with standard ET-1. Phorbol myristate acetate, a protein kinase C activator, dose-dependently increased the release of ET-1-LI from the decidual cells, while a protein kinase C inhibitor, H7, significantly attenuated the stimulatory effect of phorbol myristate acetate on ET-1-LI release. Northern blot analysis demonstrated the expression of messenger RNA for prepro-ET-1 in the decidual tissue, but no such messenger RNA was observed in the villous tissue. The human decidual tissue contained a noninteracting, single class of binding sites demonstrating higher affinity for ET-1 and ET-2 than ET-3. This would be most consistent with the ETA receptor subtype. An ET-1- induced, dose-dependent accumulation of total inositol phosphates was also observed in human decidual cells prelabeled with myo-[3H]inositol. The present results demonstrate for the first time that human decidual cells in early pregnancy can synthesize and release ET-1. These cells also possess specific functional receptors for ET-1 which are coupled to phosphoinositide hydrolysis. Thus our data suggest a possible role for ET-1 in autocrine and/or paracrine function in human decidual cells.


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