HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by van Haren, L. Articles by Rommerts, F. F. Search for Related Content PubMed Articles by van Haren, L. Articles by Rommerts, F. F.

Inhibition of the luteinizing hormone-dependent induction of cholesterol side chain cleavage enzyme in immature rat Leydig cells by Sertoli cell products

Van Haren L, Flinterman JF, Rommerts FFG. Inhibition of the luteinizing hormone-dependent induction of cholesterol side chain cleavage enzyme in immature rat Leydig cells by Sertoli cell products. Eur J Endocrinol 1995;132:627–34. ISSN 0801–4643

The modulation of the luteinizing hormone (LH) induction of cholesterol side chain cleavage (CSCC) enzyme in immature rat Leydig cells was studied using rat Sertoli cell-conditioned medium (SCCM), which stimulates short-term endogenous steroid production. Luteinizing hormone increased the CSCC enzyme activity 10-fold in cells cultured for 7 days in the absence of hormones. This enzyme induction was abolished almost completely in the presence of SCCM. The inhibition was dose dependent (halfmaximal effect at 5 mg protein/l) and paralleled by a decrease in the amount of cytochrome P-450_sec P-450_scc) enzyme. There were no indications for loss of cell viability. The inhibitory action of SCCM could be localized at the level of adenylate cyclase activation and at steps beyond cyclic adenosine monophosphate production. The inhibition was not specific for Sertoli cell products because conditioned media from different cell lines and media from isolated rat hepatocytes displayed similar effects. Trypsin treatment of SCCM destroyed the activity whereas the bioactivity could resist heating for 5 min at 100°C. Generally occurring (growth) factors, such as epidermal growth factor or tumor necrosis factor , may have contributed to the observed inhibitory effects of SCCM. These inhibitory effects of Sertoli cell products in vitro are in contrast to stimulatory effects of Sertoli cells on Leydig cell steroidogenesis in vivo after FSH administration.

Focko FG Rommerts, Department of Endocrinology & Reproduction, Erasmus University Rotterdam, PO Box 1738, 3000 DR Rotterdam, The Netherlands