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 | Acesso ao texto completo restrito à biblioteca da Embrapa Caprinos e Ovinos. Para informações adicionais entre em contato com cnpc.biblioteca@embrapa.br. |
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Registro Completo |
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Biblioteca(s): |
Embrapa Caprinos e Ovinos. |
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Data corrente: |
06/05/2013 |
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Data da última atualização: |
17/01/2024 |
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Autoria: |
CAMPBELL, B. K. |
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Título: |
The endocrine and local control of ovarian follicle development in the ewe. |
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Ano de publicação: |
2009 |
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Fonte/Imprenta: |
Animal Reproduction, Belo Horizonte, v. 6, n. 1, p. 159-171, Jan./Mar. 2009. |
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Idioma: |
Inglês |
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Conteúdo: |
Abstract: Follicle development can be divided into gonadotrophin-independent, gonadotrophin-responsive and gonadotrophin-dependent phases. The basic level of control of folliculogenesis lies with the actions of an extensively observed but poorly understood range of somatic and germ cell derived local factors that constitute an intrafollicular developmental cascade that regulates the proliferative and differentiative phases of follicle development. As follicle development progresses, the follicle become increasingly responsive to the actions of the pituitary gonadotrophins FSH and LH and during these phases of development local factors act to modulate the actions of gonadotrophins so that the fate of each follicle depends on an intrafollicular balance between local factors which augment or attenuate gonadotrophic actions. Gonadotrophins are therefore not a prerequisite for the continued growth of gonadotrophin-responsive pre-antral follicles, but FSH does appear to stimulate development and these actions are modulated by local growth factors, such as IGFs, AMH and BMPs. Naturally occurring mutations in sheep for a number of these factors or there receptors have provided insights into their roles during both the early and terminal stages of follicle development and we have recently produced extensive evidence supporting a major role for members of the BMP system in regulating follicle selection mechanisms through increased activation of gonadotrophic augmentors (BMP-6), decreased activation of attenuators (BMP-15, GDF-9, AMH) or a combination of these two mechanisms resulting in the deregulation of the normal follicle selection mechanisms. The terminal stages of follicle development, however, remain primarily under the control of the pituitary gonadotrophins, with both FSH and LH having essential and inter-related roles in regulating final maturation and selection of the ovulatory follicle and the oocyte which it contains. MenosAbstract: Follicle development can be divided into gonadotrophin-independent, gonadotrophin-responsive and gonadotrophin-dependent phases. The basic level of control of folliculogenesis lies with the actions of an extensively observed but poorly understood range of somatic and germ cell derived local factors that constitute an intrafollicular developmental cascade that regulates the proliferative and differentiative phases of follicle development. As follicle development progresses, the follicle become increasingly responsive to the actions of the pituitary gonadotrophins FSH and LH and during these phases of development local factors act to modulate the actions of gonadotrophins so that the fate of each follicle depends on an intrafollicular balance between local factors which augment or attenuate gonadotrophic actions. Gonadotrophins are therefore not a prerequisite for the continued growth of gonadotrophin-responsive pre-antral follicles, but FSH does appear to stimulate development and these actions are modulated by local growth factors, such as IGFs, AMH and BMPs. Naturally occurring mutations in sheep for a number of these factors or there receptors have provided insights into their roles during both the early and terminal stages of follicle development and we have recently produced extensive evidence supporting a major role for members of the BMP system in regulating follicle selection mechanisms through increased activation of gonadotrophic augmentors (BMP-6), decrea... Mostrar Tudo |
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Palavras-Chave: |
AMH; BMP; Folículo; FSH; LH. |
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Thesagro: |
Ovário; Ovelha; Ovino; Reprodução animal. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02564naa a2200229 a 4500
001 1957138
005 2024-01-17
008 2009 bl uuuu u00u1 u #d
100 1 $aCAMPBELL, B. K.
245 $aThe endocrine and local control of ovarian follicle development in the ewe.$h[electronic resource]
260 $c2009
520 $aAbstract: Follicle development can be divided into gonadotrophin-independent, gonadotrophin-responsive and gonadotrophin-dependent phases. The basic level of control of folliculogenesis lies with the actions of an extensively observed but poorly understood range of somatic and germ cell derived local factors that constitute an intrafollicular developmental cascade that regulates the proliferative and differentiative phases of follicle development. As follicle development progresses, the follicle become increasingly responsive to the actions of the pituitary gonadotrophins FSH and LH and during these phases of development local factors act to modulate the actions of gonadotrophins so that the fate of each follicle depends on an intrafollicular balance between local factors which augment or attenuate gonadotrophic actions. Gonadotrophins are therefore not a prerequisite for the continued growth of gonadotrophin-responsive pre-antral follicles, but FSH does appear to stimulate development and these actions are modulated by local growth factors, such as IGFs, AMH and BMPs. Naturally occurring mutations in sheep for a number of these factors or there receptors have provided insights into their roles during both the early and terminal stages of follicle development and we have recently produced extensive evidence supporting a major role for members of the BMP system in regulating follicle selection mechanisms through increased activation of gonadotrophic augmentors (BMP-6), decreased activation of attenuators (BMP-15, GDF-9, AMH) or a combination of these two mechanisms resulting in the deregulation of the normal follicle selection mechanisms. The terminal stages of follicle development, however, remain primarily under the control of the pituitary gonadotrophins, with both FSH and LH having essential and inter-related roles in regulating final maturation and selection of the ovulatory follicle and the oocyte which it contains.
650 $aOvário
650 $aOvelha
650 $aOvino
650 $aReprodução animal
653 $aAMH
653 $aBMP
653 $aFolículo
653 $aFSH
653 $aLH
773 $tAnimal Reproduction, Belo Horizonte$gv. 6, n. 1, p. 159-171, Jan./Mar. 2009.
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Embrapa Caprinos e Ovinos (CNPC) |
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| Registros recuperados : 7 | |
| 2. |  | MELO, T. S.; VEIGA, A. B.; CAMPOS, A. D. S. de; SINNEMANN, C. S.; SILVA, L. B. X. da; VIEIRA, P. A.; CONCENÇO, G.; PARFITT, J. M. B. Efeito do sistema de cultivo e manejo do solo no estabelecimento de soja em terras baixas. Brazilian Journal of Development, Curitiba, v. 7, n. 2, p. 18905-18912, Feb. 2021. Título em inglês: Effect of the growing and soil management system on soybean establishment.| Tipo: Artigo em Periódico Indexado | Circulação/Nível: B - 5 |
| Biblioteca(s): Embrapa Clima Temperado. |
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| 3. | | VEIGA, A. B.; CAMPOS, A. D. S. de; SINNEMANN, C. S.; SILVA, L. B. X. da; MELO, T. S.; VEIRA, P. A.; CONCENÇO, G.; PARFITT, J. M. B. Efeito do sistema de cultivo e manejo do solo no estabelecimento de soja em terras baixas. In: CONGRESSO BRASILEIRO DE ARROZ IRRIGADO, 11., 2019, Balneário Camboriú. Inovação e desenvolvimento na orizicultura: anais eletrônico. Itajaí: Epagri/Sosbai, 2019.| Tipo: Artigo em Anais de Congresso |
| Biblioteca(s): Embrapa Clima Temperado. |
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| 4. | | CONCENCO, G.; ANDRES, A.; PARFITT, J. M. B.; SCHREIBER, F.; CORADINI, M. C.; CAMPOS, A. D. S. de; SINNEMANN, C. S. Performance of Rice Crop as Function of Seed Treatment and Irrigation Method. International Journal of Advanced Engineering Research and Science, v. 6, n. 2. p. 86-90, 2019.| Tipo: Artigo em Periódico Indexado | Circulação/Nível: A - 2 |
| Biblioteca(s): Embrapa Clima Temperado. |
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| 5. | | SINNEMANN, C. S.; CAMPOS, A. D. S. de; VEIGA, A. B.; MUNHOS, T. F.; VIEIRA, P. A.; BERGMANN, H. M.; VEBER, P.; CONCENÇO, G.; PARFITT, J. M. B. Desenvolvimento radicial do arroz implantado em rotação a soja em áreas submetidas ou não ao processo de escarificação, com ou sem presença residual de camalhões. In: CONGRESSO BRASILEIRO DE ARROZ IRRIGADO, 11., 2019, Balneário Camboriú. Inovação e desenvolvimento na orizicultura: anais eletrônico. Itajaí: Epagri/Sosbai, 2019.| Tipo: Artigo em Anais de Congresso |
| Biblioteca(s): Embrapa Clima Temperado. |
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| 6. | | VIEIRA, P. A.; CAMPOS, A. D. S.; VEIGA, A. B.; SINNEMANN, C. S.; CONCENÇO, G.; SILVA, L. B. X. da; MELO, T. S.; PARFITT, J. M. B. Efeito da época de preparo do camalhão no desenvolvimento de plantas de soja em terras baixas. In: CONGRESSO BRASILEIRO DE ARROZ IRRIGADO, 11., 2019, Balneário Camboriú. Inovação e desenvolvimento na orizicultura: anais eletrônico. Itajaí: Epagri/Sosbai, 2019.| Tipo: Artigo em Anais de Congresso |
| Biblioteca(s): Embrapa Clima Temperado. |
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| 7. | | CONCENÇO, G.; PARFITT, J. M. B.; SINNEMANN, C. S.; CAMPOS, A. D. S.; VEIGA, A. B.; BERGMANN, H. M.; MELO, T. S.; SILVA, L. B. X. Semeadura direta de arroz em resteva de soja cultivada no sistema sulco-camalhão. Brazilian Journal of Development, Curitiba, v. 6, n. 3, p. 13221-13231, mar. 2020.| Tipo: Artigo em Periódico Indexado | Circulação/Nível: B - 5 |
| Biblioteca(s): Embrapa Clima Temperado. |
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| Registros recuperados : 7 | |
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| Nenhum registro encontrado para a expressão de busca informada. |
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