title: Reproduction in the Mexican leaf frog, Pachymedusa dacnicolor. VI. Presence and distribution of multiple GnRH forms in the brain.
abstract: The presence and distribution of gonadotropin-releasing hormone (GnRH) has been investigated in the Mexican leaf frog, Pachymedusa dacnicolor, brain during development and in the adult. The ontogenetic pattern of GnRH neurons illustrates their extracranial as well as intracranial sites. Immunohistochemical analysis indicates that GnRH-immunoreactive neurons appear during the metamorphic climax. They are located in the mesencephalon and subsequently other GnRH neurons appear in the peripheral terminal nerve and anterior preoptic area of the brain. Use of specific antisera and homologous combined with heterologous preabsorption tests indicate that mammalian and chicken GnRH-II-like peptide-containing neurons are differentially located within the brain, the former in the anterior preoptic area and peripheral terminal nerve and the latter in the mesencephalon. HPLC and RIA data suggest the presence of three forms of immunoreactive GnRH in the P. dacnicolor brain. A mammalian GnRH-like molecule and a chicken GnRH-II-like molecule are present. A third form, suspected to be [hydroxyproline9]mGnRH elutes before the mammalian GnRH.
authors.affiliation: Department of Zoology, University of Naples, via Mezzocannone 8, Naples, 80134, Italy.
authors.forename: L
authors.initials: L
authors.lastname: Iela
authors.forename: J F
authors.initials: JF
authors.lastname: Powell
authors.forename: N M
authors.initials: NM
authors.lastname: Sherwood
authors.forename: B
authors.initials: B
authors.lastname: D'Aniello
authors.forename: R K
authors.initials: RK
authors.lastname: Rastogi
authors.forename: J T
authors.initials: JT
authors.lastname: Bagnara
mesh_terms: D000818:Animals; D000911:Antibodies, Monoclonal / Q000276:immunology / Q000302:isolation & purification; D001001:Anura / Q000254:growth & development*; D001921:Brain / Q000648:ultrastructure; D001923:Brain Chemistry / Q000502:physiology*; D002227:Carbazoles / Q000737:chemistry; D002851:Chromatography, High Pressure Liquid; D004396:Coloring Agents / Q000737:chemistry; D005260:Female; D016650:Fluorescein-5-isothiocyanate / Q000737:chemistry; D005456:Fluorescent Dyes / Q000737:chemistry; D007987:Gonadotropin-Releasing Hormone / Q000031:analogs & derivatives* / Q000032:analysis / Q000502:physiology*; D007106:Immune Sera / Q000276:immunology / Q000302:isolation & purification; D007150:Immunohistochemistry / Q000379:methods; D007457:Iodine Radioisotopes; D008297:Male; D008675:Metamorphosis, Biological / Q000502:physiology*; D051379:Mice; D009474:Neurons / Q000737:chemistry* / Q000648:ultrastructure; D011817:Rabbits; D011863:Radioimmunoassay; D014966:Xanthenes / Q000737:chemistry; D004124:p-Dimethylaminoazobenzene / Q000737:chemistry
chemical_list: D000911:Antibodies, Monoclonal; D002227:Carbazoles; D004396:Coloring Agents; D005456:Fluorescent Dyes; D007106:Immune Sera; D007457:Iodine Radioisotopes; D014966:Xanthenes; D007987:Gonadotropin-Releasing Hormone; C034657:Texas red; D004124:p-Dimethylaminoazobenzene; D016650:Fluorescein-5-isothiocyanate