title: Recombinant monocyte-derived interleukin-1 receptor antagonist reverses inhibitory effects of interleukin-1 on Leydig cell steroidogenesis.
abstract: Previously we have reported that interleukin-1 (IL-1) is a potent inhibitor of Leydig cell function. Most recently, IL-1 receptor antagonist (IL-1ra) has been purified, sequenced and cloned. In the present study, we evaluated the recombinant monocyte-derived IL-1ra on the inhibitory effects of IL-1. The addition of recombinant human IL-1ra up to 1000 ng/ml has no discernible effects on human chorionic gonadotropin (hCG)-stimulated testosterone formation in primary cultures of rat Leydig cells. Similar to that reported previously, IL-1 beta caused a dose-dependent inhibition of hCG-induced testosterone. The inhibitory effect of IL-1 beta could be reversed by the concomitant addition of IL-1ra. The amounts of IL-1ra required to reverse the effect of IL-1 were 25-fold higher. Our results suggest that IL-1 is important in modulating Leydig cell function and its effect most likely is mediated by specific IL-1 receptors.
authors.affiliation: Medical Services, W.J.B. Dorn Veterans Hospital, Columbia, SC 29201.
authors.forename: T
authors.initials: T
authors.lastname: Lin
authors.forename: H
authors.initials: H
authors.lastname: Guo
authors.forename: J H
authors.initials: JH
authors.lastname: Calkins
authors.forename: D
authors.initials: D
authors.lastname: Wang
authors.forename: R
authors.initials: R
authors.lastname: Chi
mesh_terms: D000818:Animals; D002478:Cells, Cultured; D006063:Chorionic Gonadotropin / Q000494:pharmacology; D004305:Dose-Response Relationship, Drug; D053590:Interleukin 1 Receptor Antagonist Protein; D007375:Interleukin-1 / Q000737:chemistry / Q000378:metabolism / Q000494:pharmacology*; D007985:Leydig Cells / Q000187:drug effects / Q000378:metabolism*; D008297:Male; D011506:Proteins / Q000494:pharmacology*; D051381:Rats; D011919:Rats, Inbred Strains; D011971:Receptors, Immunologic / Q000378:metabolism; D017472:Receptors, Interleukin-1; D011994:Recombinant Proteins / Q000494:pharmacology; D012795:Sialoglycoproteins; D013739:Testosterone / Q000096:biosynthesis*
chemical_list: D006063:Chorionic Gonadotropin; C507763:IL1RN protein, human; D053590:Interleukin 1 Receptor Antagonist Protein; D007375:Interleukin-1; D011506:Proteins; D011971:Receptors, Immunologic; D017472:Receptors, Interleukin-1; D011994:Recombinant Proteins; D012795:Sialoglycoproteins; D013739:Testosterone