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| Registros recuperados : 3 | |
| 1. |  | SOUZA, F. C. de; CHAGAS, E. C.; DAIRIKI, J. K.; ALMEIDA, F. F. L. de; BOIJINK, C. de L. Heparina e EDTA como anticoagulantes para matrinxã (Brycon amazonicus). In: JORNADA DE INICIAÇÃO CIENTÍFICA DA EMBRAPA AMAZÔNIA OCIDENTAL, 8., 2011, Manaus. Anais... Manaus: Embrapa Amazônia Ocidental, 2012. p. 53-60. (Embrapa Amazônia Ocidental. Documentos, 99).| Biblioteca(s): Embrapa Amazônia Ocidental. |
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| 2. | | CHEN, S. X.; BOGERD, J.; ANDERSSON, E.; ALMEIDA, F. F. L. de; TARANGER, G. L.; SCHULZ, R. W. Cloning, pharmacological characterization, and expression analysis of Atlantic salmon (Salmo salar L.) nuclear progesterone receptor. Reproduction, v. 141, p. 491-500, Apr. 2011.| Biblioteca(s): Embrapa Amazônia Ocidental. |
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| 3. | | ALMEIDA, F. F. L. de; ANDERSSON, E.; MITTELHOLZER, C.; KARLSENC, Ø.; TARANGER, G. L.; SCHULZA, R. W. Pituitary gonadotropin and testicular gonadotropin receptor expression in Atlantic cod (Gadus morhua L.) during the first reproductive season: effects of photoperiod modulation. General and Comparative Endocrinology, v. 173, n. 1, p. 111-119, Ago. 2011.| Biblioteca(s): Embrapa Amazônia Ocidental. |
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| Registros recuperados : 3 | |
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 | Acesso ao texto completo restrito à biblioteca da Embrapa Amazônia Ocidental. Para informações adicionais entre em contato com cpaa.biblioteca@embrapa.br. |
Registro Completo
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Biblioteca(s): |
Embrapa Amazônia Ocidental. |
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Data corrente: |
14/07/2011 |
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Data da última atualização: |
21/07/2011 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
A - 1 |
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Autoria: |
ALMEIDA, F. F. L. de; ANDERSSON, E.; MITTELHOLZER, C.; KARLSENC, Ø.; TARANGER, G. L.; SCHULZA, R. W. |
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Afiliação: |
FERNANDA FERREIRA LOUREIRO DE ALMEI, CPAA; EVA ANDERSSON, Institute of Marine Research, Reproduction and Growth in Fish; CHRISTIAN MITTELHOLZER, Institute of Marine Research, Reproduction and Growth in Fish; ØRJAN KARLSENC, Institute of Marine Research, Reproduction and Growth in Fish; GEIR LASSE TARANGER, Institute of Marine Research, Reproduction and Growth in Fish; RÜDIGER W. SCHULZA, Utrecht University, Faculty of Sciences, Department of Biology. |
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Título: |
Pituitary gonadotropin and testicular gonadotropin receptor expression in Atlantic cod (Gadus morhua L.) during the first reproductive season: effects of photoperiod modulation. |
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Ano de publicação: |
2011 |
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Fonte/Imprenta: |
General and Comparative Endocrinology, v. 173, n. 1, p. 111-119, Ago. 2011. |
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DOI: |
10.1016/j.ygcen.2011.05.002 |
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Idioma: |
Inglês |
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Conteúdo: |
Pituitary mRNA levels of gonadotropin β-subunits and of their cognate receptors in the testis were studied during puberty in Atlantic cod under normal and experimental photoperiod conditions that suppressed, delayed or accelerated testis maturation. Results are discussed in context with changes in testicular histology and plasma androgen levels, considered as end points of gonadotropic regulation. Up-regulation of fshb was closely associated with the onset of puberty, decreased when spermatogenesis was completed and reached minimum levels after spawning. These results demonstrate, for the first time using an experimental approach, that activation of Fsh-dependent signaling is associated with spermatogonial proliferation and formation of spermatogenic cysts. Changes in fshr expression were less prominent and could be explained by changes in the cellular composition and RNA content of cod testis tissue. At more advanced stages of development (spermiogenesis, spermiation and spawning), lhb and, one month later, lhcgr transcript levels increased and reached peak values in spawning fish, in a positive feedback loop involving plasma androgens and Lh/Lhcgr-dependent signaling. This loop was broken by a loss of lhb expression at the end of the spawning season. Continuous light (LL) from summer solstice, not, vert, similar8 months prior to spawning, suppressed the start of testis maturation and the changes in gonadotropin and receptor mRNA levels, while LL from winter solstice initially up-regulated lhb and lhcgr expression, before resulting in a precocious termination of the spawning season and low expression of all four genes. Our studies provide experimental evidence for a clear functional discrimination of cod gonadotropins. MenosPituitary mRNA levels of gonadotropin β-subunits and of their cognate receptors in the testis were studied during puberty in Atlantic cod under normal and experimental photoperiod conditions that suppressed, delayed or accelerated testis maturation. Results are discussed in context with changes in testicular histology and plasma androgen levels, considered as end points of gonadotropic regulation. Up-regulation of fshb was closely associated with the onset of puberty, decreased when spermatogenesis was completed and reached minimum levels after spawning. These results demonstrate, for the first time using an experimental approach, that activation of Fsh-dependent signaling is associated with spermatogonial proliferation and formation of spermatogenic cysts. Changes in fshr expression were less prominent and could be explained by changes in the cellular composition and RNA content of cod testis tissue. At more advanced stages of development (spermiogenesis, spermiation and spawning), lhb and, one month later, lhcgr transcript levels increased and reached peak values in spawning fish, in a positive feedback loop involving plasma androgens and Lh/Lhcgr-dependent signaling. This loop was broken by a loss of lhb expression at the end of the spawning season. Continuous light (LL) from summer solstice, not, vert, similar8 months prior to spawning, suppressed the start of testis maturation and the changes in gonadotropin and receptor mRNA levels, while LL from winter solstice i... Mostrar Tudo |
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Palavras-Chave: |
Espermatogenesis; Fotoperíodo; Hormônios; Puberdade; Telaósteos. |
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Thesagro: |
Bacalhau; Hipófise; Peixe; Reprodução. |
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Categoria do assunto: |
-- |
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Marc: |
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024 7 $a10.1016/j.ygcen.2011.05.002$2DOI
100 1 $aALMEIDA, F. F. L. de
245 $aPituitary gonadotropin and testicular gonadotropin receptor expression in Atlantic cod (Gadus morhua L.) during the first reproductive season$beffects of photoperiod modulation.
260 $c2011
520 $aPituitary mRNA levels of gonadotropin β-subunits and of their cognate receptors in the testis were studied during puberty in Atlantic cod under normal and experimental photoperiod conditions that suppressed, delayed or accelerated testis maturation. Results are discussed in context with changes in testicular histology and plasma androgen levels, considered as end points of gonadotropic regulation. Up-regulation of fshb was closely associated with the onset of puberty, decreased when spermatogenesis was completed and reached minimum levels after spawning. These results demonstrate, for the first time using an experimental approach, that activation of Fsh-dependent signaling is associated with spermatogonial proliferation and formation of spermatogenic cysts. Changes in fshr expression were less prominent and could be explained by changes in the cellular composition and RNA content of cod testis tissue. At more advanced stages of development (spermiogenesis, spermiation and spawning), lhb and, one month later, lhcgr transcript levels increased and reached peak values in spawning fish, in a positive feedback loop involving plasma androgens and Lh/Lhcgr-dependent signaling. This loop was broken by a loss of lhb expression at the end of the spawning season. Continuous light (LL) from summer solstice, not, vert, similar8 months prior to spawning, suppressed the start of testis maturation and the changes in gonadotropin and receptor mRNA levels, while LL from winter solstice initially up-regulated lhb and lhcgr expression, before resulting in a precocious termination of the spawning season and low expression of all four genes. Our studies provide experimental evidence for a clear functional discrimination of cod gonadotropins.
650 $aBacalhau
650 $aHipófise
650 $aPeixe
650 $aReprodução
653 $aEspermatogenesis
653 $aFotoperíodo
653 $aHormônios
653 $aPuberdade
653 $aTelaósteos
700 1 $aANDERSSON, E.
700 1 $aMITTELHOLZER, C.
700 1 $aKARLSENC, Ø.
700 1 $aTARANGER, G. L.
700 1 $aSCHULZA, R. W.
773 $tGeneral and Comparative Endocrinology$gv. 173, n. 1, p. 111-119, Ago. 2011.
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