title: Hypophysiotropic activity of histone H3 in vitro.
abstract: To assess the effect of histone H3 on pituitary hormone secretion, rat anterior pituitary (AP) cells were used and growth hormone, prolactin, thyrotropin, luteinizing hormone and follicle stimulating hormone measured by radioimmunoassay. Incubation of cells with H3 (1, 6, and 30 microM) stimulated the release of all five hormones in a dose-dependent manner. This effect was blocked by preincubation of H3 with an anti-H3 antibody. Incubation of AP cells with 6 microM H3 in the presence of specific AP hormone secretagogues (GRP-6, thyrotropin-releasing hormone (TRH), gonadotropin-releasing hormone (GnRH)) showed additive effects on hormone secretion. Pharmacological experiments suggested that calcium- and diacylglycerol- (DAG) associated pathways, but not cAMP, participate in the hypophysiotropic activity of H3. Our results confirm previous evidence that histones may act as hypophysiotropic signals.
authors.affiliation: INIBIOLP, Facultad de Medicina, UNLP, CC 455, 1900 La Plata, Argentina. goya@isis.unlp.edu.ar
authors.forename: Oscar A
authors.initials: OA
authors.lastname: Brown
authors.forename: Yolanda E
authors.initials: YE
authors.lastname: Sosa
authors.forename: Diana
authors.initials: D
authors.lastname: Naumovich
authors.forename: Claudia B
authors.initials: CB
authors.lastname: Hereñú
authors.forename: Rodolfo G
authors.initials: RG
authors.lastname: Goya
mesh_terms: D000818:Animals; D004305:Dose-Response Relationship, Drug; D005260:Female; D006657:Histones / Q000819:agonists / Q000378:metabolism / Q000494:pharmacology*; D007030:Hypothalamo-Hypophyseal System; D010455:Peptides / Q000378:metabolism; D010903:Pituitary Gland, Anterior / Q000187:drug effects / Q000378:metabolism*; D051381:Rats; D017207:Rats, Sprague-Dawley; D043562:Receptors, G-Protein-Coupled / Q000819:agonists; D054440:Receptors, Ghrelin; D015398:Signal Transduction
chemical_list: D006657:Histones; D010455:Peptides; D043562:Receptors, G-Protein-Coupled; D054440:Receptors, Ghrelin