• Asian-Australasian Journal of Animal Sciences
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• 제21권11호
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• pp.1665-1672
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• 2008

Interspecies somatic cell nuclear transfer (iSCNT) is a useful method to preserve endangered species and to study the reprogramming event of a nuclear donor cell by the oocyte. Although several studies of iSCNT using murine cells and bovine oocytes have been reported, the development of murine-bovine iSCNT embryos beyond the 8-cell stage has not been successful. In this paper, we examined the developmental potential of embryos reconstructed with a murine embryonic fibroblast as the nuclear donor and a bovine oocyte as the cytoplasm recipient. The reconstructed embryos were cultured in CZB (murine medium) or CR1aa (bovine medium). In addition, for the development of a murine-bovine iSCNT blastocyst, the antioxidant ${\beta}$-mercaptoethanol (${\beta}ME$) was supplemented to CR1aa medium. Furthermore, to verify the mouse genome activation in murine-bovine iSCNT embryos, RT-PCR analysis of murine Xist was performed. The development of the murine-bovine iSCNT embryos cultured in CR1aa was significantly higher than that in CZB (p<0.05). With respect to the effect of BME on the development of the murine-bovine iSCNT blastocyst, addition of BME produced a significant increase in blastocyst development (p<0.05). Karyotype analysis confirmed that the reconstructed embryos were derived from murine cells (40XX). The Xist gene was gradually increased from the 8-cell stage to the blastocyst stage. This is the first report of blastocyst development of iSCNT embryos derived from murine somatic cells and bovine oocytes. These results demonstrate that bovine cytoplasm can support the development of later stages of a preimplantation embryo from murine-bovine iSCNT.

• Reproductive and Developmental Biology
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• 제37권1호
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• pp.51-55
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• 2013

The present study was conducted to examine the effect of antioxidant treatment during parthenogenetic activation procedure on the reactive oxygen species (ROS) levels and in vitro development of porcine parthenogenetic embryos. Porcine in vitro matured oocytes were activated by a combination of electric stimulus and 2 mM 6-dimethylaminopurine (6-DAMP) before in vitro culture. During the activation period, oocytes were treated with $50{\mu}M$ ${\beta}$-mercaptoethanol (${\beta}$-ME), $100{\mu}M$ L-ascorbic acid (Vit. C) or $100{\mu}M$ L-glutathione (GSH). To examine the ROS level, porcine parthenogenetic embryos were stained in $10{\mu}M$ dichlorohydrofluorescein diacetate ($H_2DCFDA$) dye 20 h after culture, examined under a fluorescence microscope, and the fluorescence intensity (pixels) were analyzed in each embryo. The parthenogenetic embryos were cultured for 6 days to evaluate the in vitro development. The apoptosis was measured by TUNEL assay. The $H_2O_2$ levels of parthenogenetic embryos were significantly lower in antioxidant treatment groups ($26.9{\pm}1.6{\sim}29.1{\pm}1.3$ pixels/embryo, p<0.05) compared to control ($33.2{\pm}1.7$ pixels/embryo). The development rate to the blastocyst stage was increased in antioxidant treatment groups (32.0~32.5%) compared to control (26.9%, p<0.05), although, there was no difference in apoptosis among groups. The result suggests that antioxidant treatment during parthenogenetic activation procedure can inhibit the ROS generation and enhance the in vitro development of porcine parthenogenetic embryos.

• Reproductive and Developmental Biology
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• 제36권2호
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• pp.115-120
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• 2012

This study was conducted to examine the optimal concentration and treatment time of antioxidants for inhibition of the ROS generation in bovine somatic cell nuclear transfer (SCNT) embryos. Bovine oocytes were activated parthenogenetically, during which oocytes were treated with various antioxidants to determine the optimal concentrations and kind of antioxidants. Determined antioxidants were applied to oocytes during in vitro maturation (IVM) and/or SCNT procedures. Finally, antioxidant-treated SCNT embryos were compared with in vitro fertilized (IVF) embryos. $H_2O_2$ levels were analyzed in embryos at 20 h of activation, fusion or insemination by staining of embryos in $10{\mu}M$ 2'7'-dichlorodihydrofluorescein diacetate (H2DCFDA) dye, followed by fluorescence microscopy. $H_2O_2$ levels of parthenogenetic embryos were significantly lower in $25{\mu}M$ ${\beta}$-mercaptoethanol (${\beta}$-ME), $50{\mu}M$ L-ascorbic acid (Vit. C), and $50{\mu}M$ L-glutathione (GSH) treatment groups than each control group ($24.0{\pm}1.5$ vs $39.0{\pm}1.1$, $29.7{\pm}1.0$ vs $37.0{\pm}1.2$, and $32.9{\pm}0.8$ vs $36.3{\pm}0.8$ pixels/embryo, p<0.05). There were no differences among above concentration of antioxidants in direct comparison ($33.6{\pm}0.9{\sim}35.2{\pm}1.1$ pixels/embryo). Thus, an antioxidant of $50{\mu}M$ Vit. C was selected for SCNT. $H_2O_2$ levels of bovine SCNT embryos were significantly lower in embryos treated with Vit. C during only SCNT procedure ($26.4{\pm}1.1$ pixels/embryo, p<0.05) than the treatment group during IVM ($29.9{\pm}1.1$ pixels/embryo) and non-treated control ($34.3{\pm}1.0$ pixels/embryo). Moreover, $H_2O_2$ level of SCNT embryos treated with Vit. C during SCNT procedure was similar to that of IVF embryos. These results suggest that the antioxidant treatment during SCNT procedures can reduce the ROS generation level of SCNT bovine embryos.

• Applied Biological Chemistry
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• 제20권1호
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• pp.26-32
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• 1977

대두(大豆)(Glycine max cultivar Gwang-gyo)의 각 성숙시기(成熟時期)에 나타나는 7S globulin을 분리하여 Davis 방법(方法)에 의한 전기영동과 PAWU용매에 의해서 유리(遊離)되는 그들의 subunit를 전기영동한 결과 7S globulin중의 복합단백질간(複合蛋白質間)에는 그 구성(構成) subunit에 유사성(類似性)이 있음을 시사하였다. 7S globulin의 복합단백질(複合蛋白質)을 DEAE-Sephadex A-50으로 크로마토그라피하여 분리하였다. 이때 pH 7.6의 인산완충액(燐酸緩衝液)에서 NaCl의 농도구배(濃度句配)가 0.28M부터 0.40M 사이에서 두 개의 분획(分劃)으로 분리되었다. 이들 명(名) 단백질(蛋白質)의 subunit를 5M urea와 1% SDS로 유리(遊離)시켜 7.5% acrylamide-PAWU gel과 5.6% acrylamide-SDS gel에서 전기영동하였다. 그 결과 subunit의 하전량(荷電量)에 의해서 분리되는 PAWU gel전기영동에서 7S globulin이 5개의 주 분리대로 분리되고 그중 2개의 분리대가 7S-A globulin과 7S-B globulin에 공유(共有)되어 있었다. 또 subunit의 분자량(分子量)에 따라서 분리되는 SDS gel 전기영동에서는 7S globulin이 7개의 주 분리대를 나타내는데 그 중에서 3개의 분리대가 7S-A와 7S-B 분획에 공유(共有)되어 있었다. 따라서 7S globulin의 복합단백질간(複合蛋白質間)에는 구성(構成) subunit간(間)에 유사성(類似性)이 있는 것으로 나타났다.