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| Registros recuperados : 12 | |
| 5. |  | MÉO, S. C.; YAMAZAKI, W.; FERREIRA, C. R.; PERECIN, F.; SARAIVA, N. Z.; LEAL, C. L. V.; GARCIA, J. M. Parthenogenetic activation of bovine oocytes using single and combined strontium, ionomycin and 6-dimethylaminopurine treatments. Zygote, v. 15, p. 295-306, nov. 2007.| Biblioteca(s): Embrapa Pecuária Sudeste. |
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| 6. | | SARAIVA, N. Z.; OLIVEIRA, C. S.; LEAL, C. L. V.; CALLADO, M. del; VANTINI, R.; MONTEIRO, F. M.; NICIURA, S. C. M.; GARCIA, J. M. Chemically induced enucleation of activated bovine oocytes: chromatin and microtubule organization and production of viable cytoplasts. Zygote, v. 23, n. 6, p. 852-862, 2015.| Biblioteca(s): Embrapa Gado de Leite; Embrapa Pecuária Sudeste. |
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| 7. | | NICIURA, S. C. M.; FERREIRA, C. R.; PERECIN, F.; YAMAZAKI, W.; LEAL, C. L. M.; GARCIA, J. M.; MEIRELLES, F. V. Desenvolvimento embrionário, visualização de pronúcleos e transferência pronuclear após centrifugação de zigotos bovinos em meio com citocalasina. São Carlos, SP: Embrapa Pecuária Sudeste, 2007 34 p. (Embrapa Pecuária Sudeste, Boletim de pesquisa e desenvolvimento,11). ISSN 1981-2078| Biblioteca(s): Embrapa Pecuária Sudeste. |
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| 8. | | PADUA, J. T.; MUNARI, D. P.; WATANABE, Y. F.; LEAL, C. L. V.; OLIVEIRA, J. de A. L.; ALENCAR, M. M. de. Avaliacao de efeitos de ambiente e da repetibilidade de caracteristicas reprodutivas em bovinos da raca Nelore. Revista Brasileira de Zootecnia, v.23, n.1, p.126-132, 1994.| Biblioteca(s): Embrapa Pecuária Sudeste. |
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| 9. | | ALENCAR, M. M. de; OLIVEIRA, J. A. L.; LEAL, C. L. V.; WATANABE, Y. F.; MUNARI, D. P.; PADUA, J. T. Repetibilidade da idade ao primeiro parto, intervalo de partos e peso ao parto em bovinos da raça Nelore. In: REUNIAO ANUAL DA SOCIEDADE BRASILEIRA DE ZOOTECNIA, 29., 1992, Lavras, MG. Anais... Lavras: SBZ, 1992. p. 96.| Biblioteca(s): Embrapa Pecuária Sudeste. |
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| 10. | | SARAIVA, N. Z.; OLIVEIRA, C. S.; LEAL, C. L. V.; LIMA, M. R. de; CALLADO, M. del; VANTINI, R.; MONTEIRO, F. M.; NICIURA, S. C. M.; GARCIA, J. M. Chemically induced enucleation of activated bovine oocytes: chromatin and microtubule organization and production of viable cytoplasts. Zygote, v. 23, n. 6, p. 852-862, Dec. 2015.| Biblioteca(s): Embrapa Amazônia Oriental. |
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| 11. | | NICIURA, S. C. M.; FERREIRA, C. R.; PERECIN, F.; SARAIVA, N. Z.; TETZNER, T. A. D.; BORGES, J. C.; YAMAZAKI, W.; LEAL, C. L. V.; MEIRELLES, F. V.; GARCIA, J. M. Troca de carioplasto entre zigotos ativados com estrôncio ou 6-DMAP. Acta Scientiae Veterinariae, Porto Alegre, v. 35, Supl. 3, 2007. p. s1269. Edição de anais da 21a. Reunião Anual da Sociedade Brasileira de Tecnologia de Embriões, Salvador, 2007.| Biblioteca(s): Embrapa Pecuária Sudeste. |
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| 12. | | SARAIVA, N. Z.; OLIVEIRA, C. S.; TETZNER, T. A. D.; MELO, D. S.; MONTEIRO, F. M.; LIMA, M. R.; LEAL, C. L. V.; NICIURA, S. C. M.; GARCIA, J. M. Evaluation of MPF and MAPK activities in recipient bovine oocytes produced by chemical enucleation techniques in nuclear transfer. In: INTERNATIONAL SYMPOSIUM ANIMAL BIOLOGY OF REPRODUCTIVE, 3., 2010, Águas de São Pedro: CBRA: USP/FMVZ, 2010| Biblioteca(s): Embrapa Pecuária Sudeste. |
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| Registros recuperados : 12 | |
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 | Acesso ao texto completo restrito à biblioteca da Embrapa Amazônia Oriental. Para informações adicionais entre em contato com cpatu.biblioteca@embrapa.br. |
Registro Completo
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Biblioteca(s): |
Embrapa Amazônia Oriental. |
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Data corrente: |
27/10/2015 |
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Data da última atualização: |
30/05/2022 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
B - 1 |
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Autoria: |
SARAIVA, N. Z.; OLIVEIRA, C. S.; LEAL, C. L. V.; LIMA, M. R. de; CALLADO, M. del; VANTINI, R.; MONTEIRO, F. M.; NICIURA, S. C. M.; GARCIA, J. M. |
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Afiliação: |
NAIARA ZOCCAL SARAIVA, CPATU; CLARA SLADE OLIVEIRA, CNPGL; Cláudia Lima Verde Leal, USP; Marina Ragagnin de Lima, UNESP; Maite Del Collado, UNESP / USP; Roberta Vantini, UNESP; Fabio Morato Monteiro, Centro APTA Bovinos de Corte, Instituto de Zootecnia; SIMONE CRISTINA MEO NICIURA, CPPSE; Joaquim Mansano Garcia, UNESP. |
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Título: |
Chemically induced enucleation of activated bovine oocytes: chromatin and microtubule organization and production of viable cytoplasts. |
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Ano de publicação: |
2015 |
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Fonte/Imprenta: |
Zygote, v. 23, n. 6, p. 852-862, Dec. 2015. |
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DOI: |
http://dx.doi.org/10.1017/S0967199414000537 |
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Idioma: |
Inglês |
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Conteúdo: |
As the standard enucleation method in mammalian nuclear transfer is invasive and damaging to cytoplast spatial organization, alternative procedures have been developed over recent years. Among these techniques, chemically induced enucleation (IE) is especially interesting because it does not employ ultraviolet light and reduces the amount of cytoplasm eliminated during the procedure. The objective of this study was to optimize the culture conditions with demecolcine of pre-activated bovine oocytes for chemically IE, and to evaluate nuclear and microtubule organization in cytoplasts obtained by this technique and their viability. In the first experiment, a negative effect on oocyte activation was verified when demecolcine was added at the beginning of the process, reducing activation rates by approximately 30%. This effect was not observed when demecolcine was added to the medium after 1.5 h of activation. In the second experiment, although a reduction in the number of microtubules was observed in most oocytes, these structures did not disappear completely during assessment. Approximately 50% of treated oocytes presented microtubule reduction at the end of the evaluation period, while 23% of oocytes were observed to exhibit the complete disappearance of these structures and 28% exhibited visible microtubules. These findings indicated the lack of immediate microtubule repolymerization after culture in demecolcine-free medium, a fact that may negatively influence embryonic development. However, cleavage rates of 63.6?70.0% and blastocyst yield of 15.5?24.2% were obtained in the final experiment, without significant differences between techniques, indicating that chemically induced enucleation produces normal embryos. MenosAs the standard enucleation method in mammalian nuclear transfer is invasive and damaging to cytoplast spatial organization, alternative procedures have been developed over recent years. Among these techniques, chemically induced enucleation (IE) is especially interesting because it does not employ ultraviolet light and reduces the amount of cytoplasm eliminated during the procedure. The objective of this study was to optimize the culture conditions with demecolcine of pre-activated bovine oocytes for chemically IE, and to evaluate nuclear and microtubule organization in cytoplasts obtained by this technique and their viability. In the first experiment, a negative effect on oocyte activation was verified when demecolcine was added at the beginning of the process, reducing activation rates by approximately 30%. This effect was not observed when demecolcine was added to the medium after 1.5 h of activation. In the second experiment, although a reduction in the number of microtubules was observed in most oocytes, these structures did not disappear completely during assessment. Approximately 50% of treated oocytes presented microtubule reduction at the end of the evaluation period, while 23% of oocytes were observed to exhibit the complete disappearance of these structures and 28% exhibited visible microtubules. These findings indicated the lack of immediate microtubule repolymerization after culture in demecolcine-free medium, a fact that may negatively influence embryonic deve... Mostrar Tudo |
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Palavras-Chave: |
Bovine; Chemically induced enucleation; Microtubule; Nuclear transfer. |
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Thesaurus NAL: |
chromatin. |
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Categoria do assunto: |
L Ciência Animal e Produtos de Origem Animal |
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Marc: |
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024 7 $ahttp://dx.doi.org/10.1017/S0967199414000537$2DOI
100 1 $aSARAIVA, N. Z.
245 $aChemically induced enucleation of activated bovine oocytes$bchromatin and microtubule organization and production of viable cytoplasts.$h[electronic resource]
260 $c2015
520 $aAs the standard enucleation method in mammalian nuclear transfer is invasive and damaging to cytoplast spatial organization, alternative procedures have been developed over recent years. Among these techniques, chemically induced enucleation (IE) is especially interesting because it does not employ ultraviolet light and reduces the amount of cytoplasm eliminated during the procedure. The objective of this study was to optimize the culture conditions with demecolcine of pre-activated bovine oocytes for chemically IE, and to evaluate nuclear and microtubule organization in cytoplasts obtained by this technique and their viability. In the first experiment, a negative effect on oocyte activation was verified when demecolcine was added at the beginning of the process, reducing activation rates by approximately 30%. This effect was not observed when demecolcine was added to the medium after 1.5 h of activation. In the second experiment, although a reduction in the number of microtubules was observed in most oocytes, these structures did not disappear completely during assessment. Approximately 50% of treated oocytes presented microtubule reduction at the end of the evaluation period, while 23% of oocytes were observed to exhibit the complete disappearance of these structures and 28% exhibited visible microtubules. These findings indicated the lack of immediate microtubule repolymerization after culture in demecolcine-free medium, a fact that may negatively influence embryonic development. However, cleavage rates of 63.6?70.0% and blastocyst yield of 15.5?24.2% were obtained in the final experiment, without significant differences between techniques, indicating that chemically induced enucleation produces normal embryos.
650 $achromatin
653 $aBovine
653 $aChemically induced enucleation
653 $aMicrotubule
653 $aNuclear transfer
700 1 $aOLIVEIRA, C. S.
700 1 $aLEAL, C. L. V.
700 1 $aLIMA, M. R. de
700 1 $aCALLADO, M. del
700 1 $aVANTINI, R.
700 1 $aMONTEIRO, F. M.
700 1 $aNICIURA, S. C. M.
700 1 $aGARCIA, J. M.
773 $tZygote$gv. 23, n. 6, p. 852-862, Dec. 2015.
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