Reproduction in the Mexican Leaf Frog,Pachymedusa dacnicolor: VI. Presence and Distribution of Multiple GnRH Forms in the Brain |
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| Authors: | Luisa Iela James FF Powell Nancy M Sherwood Biagio D'Aniello Rakesh K Rastogi Joseph T Bagnara |
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| Institution: | aDepartment of Zoology, University of Naples, via Mezzocannone 8, 80134, Naples, Italy;bDepartment of Biology, University of Victoria, Victoria, British Columbia, V8W 2Y2, Canada;cDepartment of Cell Biology and Anatomy, College of Medicine, The University of Arizona Health Science Center, Tucson, Arizona, 85724 |
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| 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 theP. dacnicolorbrain. 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. |
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