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Registro Completo |
Biblioteca(s): |
Embrapa Caprinos e Ovinos. |
Data corrente: |
06/11/2002 |
Data da última atualização: |
06/11/2002 |
Autoria: |
ADAMS, T. E.; SAKURAI, H.; ADAMS, B. M. |
Título: |
Effect of stress-like concentrations of cortisol on estradiol-dependent expression of gonadotropin-releasing hormone receptor in orchidectomized sheep. |
Ano de publicação: |
1999 |
Fonte/Imprenta: |
Biology of Reproduction, v. 60, n. 1, p. 164-168, 1999. |
Idioma: |
Inglês |
Conteúdo: |
The effect of stress-like concentrations of cortisol (C) on estrogen-dependent expression of GnRH receptor was evaluated using orchidectomized sheep (wethers; n = 6 anímais per group). C (5.0 mg/50 kg per hour; groups 1-4) or a comparable volume of vehicle (groups 5-8) was delivered by continuous in- fusion for 48 h. During the final 24 h of infusion, anímais received concurrent infusion of estradiol (E2) at rates of O (groups 1 and 5), 0.5 (groups 2 and 6), 2.0 (groups 3 and 7), or 8.0 (groups 4 and 8) Jl.g/50 kg per hour. Pituitary tissue was collected at the end of infusion. Although C did not affect (p > 0.05) the basal concentration of GnRH receptor or GnRH receptor mRNA, it reduced (p < 0.05) the increase in receptor and receptor mRNA induced by concurrent administration of 0.5 ug E2/50 kg per hour. In contrast, the increase in GnRH receptor expression induced by higher levels of estrogen stimulation was not affected (p > 0.05) by concurrent administration of C. The effect of C on the temporal pattern of E2-depen- dent increase in GnRH receptor expression was assessed using wethers receiving E2 (0.5 Jl.g/50 kg per hour) by continuous in- fusion for O (groups 1 and 5), 24 (groups 2 and 6), 48 (groups 3 and 7), or 72 h (groups 4 and 8). Animals received C (5.0 mg/ 50 kg per hour; groups 1-4) or vehicle (groups 5-8) beginning 24 h before, and continuing throughout, the E2 delivery period. Stress-like concentrations of C reduced (p < 0.05) the increase in GnRH receptor and receptor mRNA induced after 24 h of E2 stimulation. However, the suppressive effect of C was transient, and tissue levels of GnRH receptor and receptor mRNA were comparable after 72 h of E2 infusion in anímais receiving C or vehicle alone. Collectively these observations demonstrate that C suppresses estrogen-dependent increase in tissue concentrations of GnRH receptor and receptor mRNA. However, this effect of C is transient and not evident in animals receiving moderate to high levels of estrogen stimulation. This transient suppression of GnRH receptor expression mar account, at least in part, for the anti-gonadal effect of glucocorticoids. MenosThe effect of stress-like concentrations of cortisol (C) on estrogen-dependent expression of GnRH receptor was evaluated using orchidectomized sheep (wethers; n = 6 anímais per group). C (5.0 mg/50 kg per hour; groups 1-4) or a comparable volume of vehicle (groups 5-8) was delivered by continuous in- fusion for 48 h. During the final 24 h of infusion, anímais received concurrent infusion of estradiol (E2) at rates of O (groups 1 and 5), 0.5 (groups 2 and 6), 2.0 (groups 3 and 7), or 8.0 (groups 4 and 8) Jl.g/50 kg per hour. Pituitary tissue was collected at the end of infusion. Although C did not affect (p > 0.05) the basal concentration of GnRH receptor or GnRH receptor mRNA, it reduced (p < 0.05) the increase in receptor and receptor mRNA induced by concurrent administration of 0.5 ug E2/50 kg per hour. In contrast, the increase in GnRH receptor expression induced by higher levels of estrogen stimulation was not affected (p > 0.05) by concurrent administration of C. The effect of C on the temporal pattern of E2-depen- dent increase in GnRH receptor expression was assessed using wethers receiving E2 (0.5 Jl.g/50 kg per hour) by continuous in- fusion for O (groups 1 and 5), 24 (groups 2 and 6), 48 (groups 3 and 7), or 72 h (groups 4 and 8). Animals received C (5.0 mg/ 50 kg per hour; groups 1-4) or vehicle (groups 5-8) beginning 24 h before, and continuing throughout, the E2 delivery period. Stress-like concentrations of C reduced (p < 0.05) the increase in GnRH receptor and... Mostrar Tudo |
Palavras-Chave: |
Gonadotropina; Receptor. |
Thesagro: |
Estradiol; Hormônio; Ovino; Stress. |
Thesaurus Nal: |
cortisol. |
Categoria do assunto: |
-- |
Marc: |
LEADER 02823naa a2200229 a 4500 001 1528814 005 2002-11-06 008 1999 bl uuuu u00u1 u #d 100 1 $aADAMS, T. E. 245 $aEffect of stress-like concentrations of cortisol on estradiol-dependent expression of gonadotropin-releasing hormone receptor in orchidectomized sheep. 260 $c1999 520 $aThe effect of stress-like concentrations of cortisol (C) on estrogen-dependent expression of GnRH receptor was evaluated using orchidectomized sheep (wethers; n = 6 anímais per group). C (5.0 mg/50 kg per hour; groups 1-4) or a comparable volume of vehicle (groups 5-8) was delivered by continuous in- fusion for 48 h. During the final 24 h of infusion, anímais received concurrent infusion of estradiol (E2) at rates of O (groups 1 and 5), 0.5 (groups 2 and 6), 2.0 (groups 3 and 7), or 8.0 (groups 4 and 8) Jl.g/50 kg per hour. Pituitary tissue was collected at the end of infusion. Although C did not affect (p > 0.05) the basal concentration of GnRH receptor or GnRH receptor mRNA, it reduced (p < 0.05) the increase in receptor and receptor mRNA induced by concurrent administration of 0.5 ug E2/50 kg per hour. In contrast, the increase in GnRH receptor expression induced by higher levels of estrogen stimulation was not affected (p > 0.05) by concurrent administration of C. The effect of C on the temporal pattern of E2-depen- dent increase in GnRH receptor expression was assessed using wethers receiving E2 (0.5 Jl.g/50 kg per hour) by continuous in- fusion for O (groups 1 and 5), 24 (groups 2 and 6), 48 (groups 3 and 7), or 72 h (groups 4 and 8). Animals received C (5.0 mg/ 50 kg per hour; groups 1-4) or vehicle (groups 5-8) beginning 24 h before, and continuing throughout, the E2 delivery period. Stress-like concentrations of C reduced (p < 0.05) the increase in GnRH receptor and receptor mRNA induced after 24 h of E2 stimulation. However, the suppressive effect of C was transient, and tissue levels of GnRH receptor and receptor mRNA were comparable after 72 h of E2 infusion in anímais receiving C or vehicle alone. Collectively these observations demonstrate that C suppresses estrogen-dependent increase in tissue concentrations of GnRH receptor and receptor mRNA. However, this effect of C is transient and not evident in animals receiving moderate to high levels of estrogen stimulation. This transient suppression of GnRH receptor expression mar account, at least in part, for the anti-gonadal effect of glucocorticoids. 650 $acortisol 650 $aEstradiol 650 $aHormônio 650 $aOvino 650 $aStress 653 $aGonadotropina 653 $aReceptor 700 1 $aSAKURAI, H. 700 1 $aADAMS, B. M. 773 $tBiology of Reproduction$gv. 60, n. 1, p. 164-168, 1999.
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Registro original: |
Embrapa Caprinos e Ovinos (CNPC) |
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Registro Completo
Biblioteca(s): |
Embrapa Gado de Leite. |
Data corrente: |
13/02/2013 |
Data da última atualização: |
15/03/2024 |
Tipo da produção científica: |
Artigo em Anais de Congresso |
Autoria: |
REIS, L. G.; DUQUE, A. C. A.; LOPES, F. C. F.; OLIVEIRA, J. S. e; MORENZ, M. J. F.; BARROS, P. A. V. DE; ALEVATO, C. B.; MOURA, P. P. R. |
Afiliação: |
LARISSA GOMES REIS, UFJF; ANNA CAROLYNNA ALVIM DUQUE, UFMG; FERNANDO CESAR FERRAZ LOPES, CNPGL; JACKSON SILVA E OLIVEIRA, CNPGL; MIRTON JOSE FROTA MORENZ, CNPGL; PATRICIA APARECIDA VIEIRA DE BARROS, UFMG; CAROLLINA BANNI ALEVATO, CNPQ; PAULA PEREIRA RIBEIRO MOURA, UFJF. |
Título: |
Consumo de matéria seca e nutrientes de vacas Holandes x Gir em lactação alimentadas com dietas contendo ou não glicerina em substituição ao milho concentrado. |
Ano de publicação: |
2012 |
Fonte/Imprenta: |
In: REUNIÃO ANUAL DA SOCIEDADE BRASILEIRA DE ZOOTECNIA, 49., 2012, Brasília. A produção animal no mundo em transformação: anais. Brasília, DF: SBZ, 2012. |
Idioma: |
Português |
Palavras-Chave: |
Farelo de soja; Fubá de milho; Glicerol; Silagem de milho. |
Categoria do assunto: |
F Plantas e Produtos de Origem Vegetal |
URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/doc/949045/1/Consumo-de-materia-seca.pdf
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Marc: |
LEADER 00881nam a2200229 a 4500 001 1949045 005 2024-03-15 008 2012 bl uuuu u00u1 u #d 100 1 $aREIS, L. G. 245 $aConsumo de matéria seca e nutrientes de vacas Holandes x Gir em lactação alimentadas com dietas contendo ou não glicerina em substituição ao milho concentrado.$h[electronic resource] 260 $aIn: REUNIÃO ANUAL DA SOCIEDADE BRASILEIRA DE ZOOTECNIA, 49., 2012, Brasília. A produção animal no mundo em transformação: anais. Brasília, DF: SBZ$c2012 653 $aFarelo de soja 653 $aFubá de milho 653 $aGlicerol 653 $aSilagem de milho 700 1 $aDUQUE, A. C. A. 700 1 $aLOPES, F. C. F. 700 1 $aOLIVEIRA, J. S. e 700 1 $aMORENZ, M. J. F. 700 1 $aBARROS, P. A. V. DE 700 1 $aALEVATO, C. B. 700 1 $aMOURA, P. P. R.
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