Artículo
Gonadotropin-releasing hormone (GnRH) variants in a lizard brain: Is mammalian GnRH being expressed?
Montaner, Alejandro Daniel
; Gonzalez, Olga Mabel; Paz, Dante Agustin
; Affanni, Jorge Mario
; Somoza, Gustavo Manuel
Fecha de publicación:
03/2000
Editorial:
Academic Press Inc Elsevier Science
Revista:
General and Comparative Endocrinology
ISSN:
0016-6480
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
In reptiles as in other vertebrates, multiple forms of gonadotropin-releasing hormone (GnRH) within a single brain have been identified. In this group the following GnRH molecular variants have been characterized either by direct or indirect methods: chicken GnRH I (cGnRH-I), chicken GnRH II (cGnRH-II), salmon GnRH (sGnRH) and several unidentified GnRH-like forms. In the present study GnRH variants were investigated in brain extracts of the lizard Tupinambis teguixin (= T. merinae) by combining high-performance liquid chromatography (RP-HPLC) followed by radioimmunoassays (RIA). Two peaks showing GnRH immunoreactivity with the elution position of synthetic mammalian GnRH (mGnRH) and cGnRH-II were detected. Both peaks were further analyzed with different radioimmunoassay systems specific for mGnRH, cGnRH-I, and cGnRH-II. Pooled fractions corresponding to the first eluting peak showed no cross-reactivity when analyzed with a cGnRH-I specific assay and logit-log displacement curves were not significantly different from those of synthetic mGnRH with homologous RIA systems. The second peak showed immunological characteristics of cGnRH-II when analyzed with a specific antiserum. The first ir-GnRH peak was selected for further RP-HPLC purification showing similar chromatographic behavior as mGnRH synthetic standard. We demonstrated the absence of cGnRH-I in this lizard using well-characterized antisera. (C) 2000 Academic Press.
Palabras clave:
Brain
,
Gonadotropin-Releasing Hormone
,
Reptiles
,
Ria
,
Rp-Hplc
Archivos asociados
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Identificadores
Colecciones
Articulos(CCT - LA PLATA)
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - LA PLATA
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - LA PLATA
Articulos(IIB-INTECH)
Articulos de INST.DE INVEST.BIOTECNOLOGICAS - INSTITUTO TECNOLOGICO CHASCOMUS
Articulos de INST.DE INVEST.BIOTECNOLOGICAS - INSTITUTO TECNOLOGICO CHASCOMUS
Citación
Montaner, Alejandro Daniel; Gonzalez, Olga Mabel; Paz, Dante Agustin; Affanni, Jorge Mario; Somoza, Gustavo Manuel; Gonadotropin-releasing hormone (GnRH) variants in a lizard brain: Is mammalian GnRH being expressed?; Academic Press Inc Elsevier Science; General and Comparative Endocrinology; 119; 2; 3-2000; 121-131
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