| |
|
|
|
Registro Completo |
|
Biblioteca(s): |
Embrapa Caprinos e Ovinos. |
|
Data corrente: |
06/11/2002 |
|
Data da última atualização: |
06/11/2002 |
|
Autoria: |
DALEY, C. A.; SAKURAI, H.; ADAMS, B. M.; ADAMS, T. E. |
|
Título: |
Effect of stress-like concentrations of cortisol on gonadotroph function in orchidectomized sheep. |
|
Ano de publicação: |
1999 |
|
Fonte/Imprenta: |
Biology of Reproduction, v. 60, n. 1, p. 158-163, 1999. |
|
Idioma: |
Inglês |
|
Conteúdo: |
The effect of stress-like concentrations of cortisol (C) on the feedback potency of estradiol (E,) was assessed using 32 orchidectomized sheep (wethers) assigned at random to 1 of 4 treatment groups in a 2 x 2 factorial design. Wethers received C (3.6 mg/50 kg per hour; groups 2 and 4) or a comparable volume of C delivery vehicle (groups 1 and 3) as a continuous infusion for 7 days. During the final 48 h of infusion, wethers received E2 (0.3 ug/50 kg/h; groups 3 and 4) or E2 delivery vehicle (groups 1 and 2). The pattern of LH secretion was assessed during a 4 h period of intensive blood collection beginning 44 h after initiation of E2 infusion. Gonadotroph responsiveness (LH secretion induced by GnRH challenge [500 ng, i.v.]) was determined 48 h after E2 delivery was begun. Although lhe frequency of secretory episodes of LH was not affected (p > 0.05) by infusion of C or E2 alone, LH pulse frequency was significantly decreased in wethers receiving C and E2 in combination. In contrast, neither the magnitude of basal gonadotroph responsiveness nor the extent of E2-dependent augmentation of responsiveness was significantly affected by stress-like concentrations of C. In a second experiment, the effect of C on the magnitude of E2-induced in- crease in pituitary concentration of GnRH receptor and GnRH receptor mRNA was assessed using 32 additional wethers. Continuous infusion of E2 for 48 h increased (p < 0.05) tissue concentrations of GnRH receptor and GnRH receptor mRNA. Con- current delivery of C did not affect (p > 0.05) E2-induced in- crease in GnRH receptor mRNA but significantly reduced the magnitude of the E2-dependent increase in pituitary concentration of GnRH receptor. Collectively, these data indicate that stress-like concentrations of C enhance the negative feedback potency of E2 and reduce estrogen-dependent augmentation of the concentration of GnRH receptor in pituitary tissue. MenosThe effect of stress-like concentrations of cortisol (C) on the feedback potency of estradiol (E,) was assessed using 32 orchidectomized sheep (wethers) assigned at random to 1 of 4 treatment groups in a 2 x 2 factorial design. Wethers received C (3.6 mg/50 kg per hour; groups 2 and 4) or a comparable volume of C delivery vehicle (groups 1 and 3) as a continuous infusion for 7 days. During the final 48 h of infusion, wethers received E2 (0.3 ug/50 kg/h; groups 3 and 4) or E2 delivery vehicle (groups 1 and 2). The pattern of LH secretion was assessed during a 4 h period of intensive blood collection beginning 44 h after initiation of E2 infusion. Gonadotroph responsiveness (LH secretion induced by GnRH challenge [500 ng, i.v.]) was determined 48 h after E2 delivery was begun. Although lhe frequency of secretory episodes of LH was not affected (p > 0.05) by infusion of C or E2 alone, LH pulse frequency was significantly decreased in wethers receiving C and E2 in combination. In contrast, neither the magnitude of basal gonadotroph responsiveness nor the extent of E2-dependent augmentation of responsiveness was significantly affected by stress-like concentrations of C. In a second experiment, the effect of C on the magnitude of E2-induced in- crease in pituitary concentration of GnRH receptor and GnRH receptor mRNA was assessed using 32 additional wethers. Continuous infusion of E2 for 48 h increased (p < 0.05) tissue concentrations of GnRH receptor and GnRH receptor mRNA. Con- ... Mostrar Tudo |
|
Palavras-Chave: |
Gonadotropina. |
|
Thesagro: |
Hormônio; Ovino; Stress. |
|
Thesaurus Nal: |
cortisol. |
|
Categoria do assunto: |
-- |
|
Marc: |
LEADER 02515naa a2200217 a 4500
001 1528806
005 2002-11-06
008 1999 bl uuuu u00u1 u #d
100 1 $aDALEY, C. A.
245 $aEffect of stress-like concentrations of cortisol on gonadotroph function in orchidectomized sheep.
260 $c1999
520 $aThe effect of stress-like concentrations of cortisol (C) on the feedback potency of estradiol (E,) was assessed using 32 orchidectomized sheep (wethers) assigned at random to 1 of 4 treatment groups in a 2 x 2 factorial design. Wethers received C (3.6 mg/50 kg per hour; groups 2 and 4) or a comparable volume of C delivery vehicle (groups 1 and 3) as a continuous infusion for 7 days. During the final 48 h of infusion, wethers received E2 (0.3 ug/50 kg/h; groups 3 and 4) or E2 delivery vehicle (groups 1 and 2). The pattern of LH secretion was assessed during a 4 h period of intensive blood collection beginning 44 h after initiation of E2 infusion. Gonadotroph responsiveness (LH secretion induced by GnRH challenge [500 ng, i.v.]) was determined 48 h after E2 delivery was begun. Although lhe frequency of secretory episodes of LH was not affected (p > 0.05) by infusion of C or E2 alone, LH pulse frequency was significantly decreased in wethers receiving C and E2 in combination. In contrast, neither the magnitude of basal gonadotroph responsiveness nor the extent of E2-dependent augmentation of responsiveness was significantly affected by stress-like concentrations of C. In a second experiment, the effect of C on the magnitude of E2-induced in- crease in pituitary concentration of GnRH receptor and GnRH receptor mRNA was assessed using 32 additional wethers. Continuous infusion of E2 for 48 h increased (p < 0.05) tissue concentrations of GnRH receptor and GnRH receptor mRNA. Con- current delivery of C did not affect (p > 0.05) E2-induced in- crease in GnRH receptor mRNA but significantly reduced the magnitude of the E2-dependent increase in pituitary concentration of GnRH receptor. Collectively, these data indicate that stress-like concentrations of C enhance the negative feedback potency of E2 and reduce estrogen-dependent augmentation of the concentration of GnRH receptor in pituitary tissue.
650 $acortisol
650 $aHormônio
650 $aOvino
650 $aStress
653 $aGonadotropina
700 1 $aSAKURAI, H.
700 1 $aADAMS, B. M.
700 1 $aADAMS, T. E.
773 $tBiology of Reproduction$gv. 60, n. 1, p. 158-163, 1999.
Download
Esconder MarcMostrar Marc Completo |
|
Registro original: |
Embrapa Caprinos e Ovinos (CNPC) |
|
|
Biblioteca |
ID |
Origem |
Tipo/Formato |
Classificação |
Cutter |
Registro |
Volume |
Status |
URL |
Voltar
|
|
|
| Registros recuperados : 26 | |
| 1. |  | ARRIEL, N. H. C.; UNÊDA- TREVISOLI, S.H.; CAPELOTO, A.; DI MAURO, S. M. Z.; DI MAURO, A. O. Análise comparativa de quatro protocolos de extração de DNA genômico, em gergelim. Revista Brasileira de Oleaginosas e Fibrosas, v.6, n.2, p.525-535, 2002.| Biblioteca(s): Embrapa Algodão. |
|   |
| 3. | | SILVA, A. J. da; SANCHES, A.; ANDRADE, A. C. B.; OLIVEIRA, G. H. F. de; DI MAURO, A. O. Bayesian approach, traditional method, and mixed models for multienvironment trials of soybean. Pesquisa Agropecuária Brasileira, Brasília, DF, v. 53, n. 10, p. 1093-1100, Oct. 2018. Título em português: Abordagem bayesiana, método tradicional e modelos mistos para experimentos multiambientes na cultura da soja.| Biblioteca(s): Embrapa Unidades Centrais. |
|  |
| 5. | | VIEIRA, R. D.; MINOHARA, L.; PANOBIANCO, M.; BERGAMASCHI, M. C. M.; MAURO, A. O. Comportamento de cultivares de soja quanto a qualidade fisiológica de sementes. Pesquisa Agropecuária Brasileira, Brasília, DF, v. 33, n. 2, p.123-130, fev. 1998 Título em inglês: Soybean cultivars behaviour as to physiological seed quality.| Biblioteca(s): Embrapa Unidades Centrais. |
| |
| 6. | | SILVA, D. C. G.; MORTEL, M. van de; WHITHAM, S.; BAUM, T.; PASSIANOTTO, A. L. de L.; NOGUEIRA, L. M.; BENEVENTI, M. A.; BINNECK, E.; YAMANAKA, N.; NEPOMUCENO, A. L.; ALMEIDA, A. M. R.; DI MAURO, A. O.; ABDELNOOR, R. V. Construção e análise de bibliotecas subtrativas de cDNA de genótipos de soja sob interação com o fungo causador da ferrugem asiática. In: CONGRESSO BRASILEIRO DE GENÉTICA, 52.; CONGRESO DE LA ASOCIACIÓN LATINOAMERICANA DE GENÉTICA, 12., 2006, Foz do Iguaçu. Resumos... Ribeirão Preto, SP: Sociedade Brasileira de Genética, 2006. 1 CD-ROM. Área Plantas - pdf 1270.| Biblioteca(s): Embrapa Soja. |
| |
| 7. | | DI MAURO, A. O.; CURCIOLI, V. B.; NÓBREGA, J. C. M. de; BANZATO, D. A.; SEDIYAMA, T. Correlação entre medidas paramétricas e não-paramétricas de estabilidade em soja. Pesquisa Agropecuária Brasileira, Brasília, DF, v. 35, n. 4, p. 687-696, abr. 2000. Título em inglês: Correlation between parametric and non parametric stability measures in soybean.| Biblioteca(s): Embrapa Unidades Centrais. |
| |
| 11. | | GILIOLI, J. L.; KIIHL, R. A. S.; BARRETO, J. N.; COSTA, N. P.; MAURO, A. O. Desenvolvimento de metodologia para a selecao de genotipos de soja com alta qualidade fisiologica de sementes. In: SEMINARIO NACIONAL DE PESQUISA DE SOJA, 3., 1984, Campinas. Anais... Londrina: EMBRAPA-CNPS, 1984. p.993-1007. (EMBRAPA-CNPS. Documentos, 7).| Biblioteca(s): Embrapa Soja. |
| |
| 12. | | DI MAURO, A. O.; UNÊDA-TREVISOLI, S. H.; DI MAURO, S. M. Z.; COSTA, M. M.; OLIVEIRA, R. C. de; ARANTES, N. E. Efficiency of microsatellite markers in assisted selection for resistance to soybean cyst nematode (race 3). Crop Breeding and Applied Biotechnology, Viçosa, v. 4, n. 1, p. 28-37, Mar. 2004.| Tipo: Artigo em Periódico Indexado | Circulação/Nível: Nacional - B |
| Biblioteca(s): Embrapa Soja. |
| |
| 14. | | COSTA, M. M.; DI MAURO, A. O.; UNÊDA-TREVISOLI, S.H.; ARRIEL, N. H. C.; BÁRBARO, I. M.; MUNIZ, F. R. S. Ganho genético por diferentes critérios de seleção em populações segregantes de soja. Pesquisa Agropecuária Brasileira, Brasília, DF, v. 39, n. 11, p. 1095-1102, novembro 2004 Título em inglês: Genetic gain by different selection criteria in soybean segregant populations.| Biblioteca(s): Embrapa Unidades Centrais. |
| |
| 15. | | ARRIEL, N. H. C.; MAURO, A. O. D.; ARRIEL, E. F.; UNÊDA-TREVISOLI, S. H.; COSTA, M. M.; BÁRBARO, I. M.; MUNIZ, F. R. S. Genetic divergence in sesame based on morphological and agronomic traits. Crop Breeding and Applied Biotechnology, v.7, n.3, p.253-261, 2007.| Tipo: Artigo em Periódico Indexado | Circulação/Nível: Internacional - C |
| Biblioteca(s): Embrapa Algodão. |
| |
| 16. | | OLIVEIRA, J. C.; NAKAMURA, K.; CENTURION, M. A. P. C.; RUGGIERO, C.; FERREIRA, F. R.; MAURO, A. O. Hibridação entre Passiflora alata Ait vs. P. edulis Sims f. flavicarpa Deg. In: CONGRESSO BRASILEIRO DE FRUTICULTURA, 13., 1994, Salvador. Resumos... Salvador: SBF, 1994. p.825.| Biblioteca(s): Embrapa Recursos Genéticos e Biotecnologia. |
|  |
| 17. | | MORCELI, T. G. S.; TREVISOLI, S. H. U.; MORCELI JUNIOR, A. A.; KIIHL, R. A. de S.; CALVO, E. S.; DI MAURO, A. O.; GARCIA, A. Identificação e validação de marcadores microssatélites ligados ao gene Rpp5 de resistência à ferrugem-asiática-da-soja. Pesquisa Agropecuária Brasileira, Brasília, DF, v. 43, n. 11, p. 1525-1531, nov. 2008. Título em inglês: Identification and validation of microsatellite markers linked to the Rpp5 gene conferring resistance to Asian soybean rust.| Biblioteca(s): Embrapa Unidades Centrais. |
| |
| 18. | | SILVA, D. C. G. da; YAMANAKA, N.; BROGIN, R. L.; ARIAS, C. A. A.; NEPOMUCENO, A. L.; DI MAURO, A. O.; NOGUEIRA, L. M.; PASSIANOTTO, A. L. de L.; PEREIRA, S. dos S.; ABDELNOOR, R. V. Mapeamento do gene Rpp2 que confere resistência à ferrugem asiática da soja. In: CONGRESSO BRASILEIRO DE SOJA, 4., 2006, Londrina. Resumos... Londrina: Embrapa Soja, 2006. p. 45. Organizado por Odilon Ferreira Saraiva, Simone Ery Grosskopf.| Biblioteca(s): Embrapa Soja. |
| |
| 19. | | SILVA, D. C. G. da; YAMANAKA, N.; BROGIN, R. L.; ARIAS, C. A. A.; NEPOMUCENO, A. L.; DI MAURO, A. O.; NOGUEIRA, L. M.; PASSIANOTTO, A. L. de L.; PEREIRA, S. dos S.; ABDELNOOR, R. V. Mapeamento do gene Rpp4 que confere resistência à ferrugem asiática da soja. In: CONGRESSO BRASILEIRO DE SOJA, 4., 2006, Londrina. Resumos... Londrina: Embrapa Soja, 2006. p. 45. Organizado por Odilon Ferreira Saraiva, Simone Ery Grosskopf.| Biblioteca(s): Embrapa Soja. |
| |
| Registros recuperados : 26 | |
|
| Nenhum registro encontrado para a expressão de busca informada. |
|
|
