Effects of mGnRH on testicular steroidogenesis in the toad Bufo arenarum

GnRH controls vertebrate reproduction in several ways. This hormone not only affects the secretion of gonadotropins from the pituitary gland but also has a direct influence on several gonadal functions such as steroidogenesis, spermatogenesis, and spermiation. In the present paper we have studied th...

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Autor principal: Canosa, L.F
Otros Autores: Pozzi, A.G, Somoza, G.M, Ceballos, N.R
Formato: Capítulo de libro
Lenguaje:Inglés
Publicado: Academic Press Inc. 2002
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024 7 |2 cas  |a chorionic gonadotropin, 9002-61-3; cytochrome P450, 9035-51-2; gonadorelin, 33515-09-2, 9034-40-6; gonadotropin, 63231-54-9; protein, 67254-75-5 
040 |a Scopus  |b spa  |c AR-BaUEN  |d AR-BaUEN 
030 |a GCENA 
100 1 |a Canosa, L.F. 
245 1 0 |a Effects of mGnRH on testicular steroidogenesis in the toad Bufo arenarum 
260 |b Academic Press Inc.  |c 2002 
270 1 0 |m Ceballos, N.R.; Departamento de Ciencias Biologicas, F. Cie. Exactas y Nat./PRHOM-CONICET, Universidad de Buenos Aires, Pabellón 2, C1428EHA Buenos Aires, Argentina; email: nceballo@bg.fcen.uba.ar 
506 |2 openaire  |e Política editorial 
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520 3 |a GnRH controls vertebrate reproduction in several ways. This hormone not only affects the secretion of gonadotropins from the pituitary gland but also has a direct influence on several gonadal functions such as steroidogenesis, spermatogenesis, and spermiation. In the present paper we have studied the in vitro effects of GnRH on the testicular steroidogenesis of Bufo arenarum to ascertain the role of this peptide in the control of the steroidogenic pathway previously described in this species. It was found that GnRH is able to reduce basal as well as hCG-stimulated testosterone release, having an inhibitory effect on P450c17 activity. Thus, GnRH could be involved in the mechanism that regulates the metabolic change in the testicular steroidogenesis. Additionally, testicular GnRH binding site has been characterised, showing a Kd of 34 nM and a maximum binding of 4.7 pmol/mg protein. © 2002 Elsevier Science (USA). All rights reserved.  |l eng 
536 |a Detalles de la financiación: Universidad de Buenos Aires 
536 |a Detalles de la financiación: National Council for Scientific Research 
536 |a Detalles de la financiación: Consejo Nacional de Investigaciones Científicas y Técnicas 
536 |a Detalles de la financiación: This work was supported by grants from the National Research Council of Argentina (CONICET) to the “Programa de Regulación Hormonal y Metabólica” (PRHOM), and the University of Buenos Aires. The authors wish to thank Dr. Carlos P. Lantos for the critical revision of the manuscript. The authors also thank Elea Lab. (Argentina), for the supply of hCG and Dr Damasia Becú-Villalobos (IByME-CONICET) for providing Buserelin. 
593 |a Laboratorio De Endocrinología Comparada, Departamento De Ciencias Biológicas, Universidad De Buenos Aires, C1428EHA Buenos Aires, Argentina 
593 |a Instituto Tecnológico De Chascomús, IIB/INTECH (CONICET-Universidad De San Martín), Provincia de Buenos Aires, Argentina 
690 1 0 |a AMPHIBIAN-TESTIS 
690 1 0 |a GNRH-RECEPTOR 
690 1 0 |a GONADOTROPIN-RELEASING HORMONE 
690 1 0 |a STEROIDOGENESIS 
690 1 0 |a STEROIDOGENIC-ENZYME 
690 1 0 |a TOAD 
690 1 0 |a CHORIONIC GONADOTROPIN 
690 1 0 |a CYTOCHROME P450 
690 1 0 |a GONADORELIN 
690 1 0 |a GONADOTROPIN 
690 1 0 |a PROTEIN 
690 1 0 |a ANIMAL TISSUE 
690 1 0 |a ARTICLE 
690 1 0 |a BINDING SITE 
690 1 0 |a CONTROLLED STUDY 
690 1 0 |a ENZYME ACTIVITY 
690 1 0 |a HORMONE ACTION 
690 1 0 |a HORMONE BINDING 
690 1 0 |a HORMONE RELEASE 
690 1 0 |a IN VITRO STUDY 
690 1 0 |a MALE 
690 1 0 |a NONHUMAN 
690 1 0 |a PRIORITY JOURNAL 
690 1 0 |a PROTEIN BINDING 
690 1 0 |a REGULATORY MECHANISM 
690 1 0 |a STEROIDOGENESIS 
690 1 0 |a TESTIS 
690 1 0 |a TESTOSTERONE RELEASE 
690 1 0 |a TOAD 
700 1 |a Pozzi, A.G. 
700 1 |a Somoza, G.M. 
700 1 |a Ceballos, N.R. 
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