To investigate the effects of different states of donor cells on the development of reconstructed sheep embryos, we designed five treatments of donor cells, including cell passage, cell size, serum starvation, colchic...To investigate the effects of different states of donor cells on the development of reconstructed sheep embryos, we designed five treatments of donor cells, including cell passage, cell size, serum starvation, colchicine treatment and gene transfection. Results are as follows: (Ⅰ) Compared with 16-18 passage cells, the morula/blastocyst rate of 5-7 passage cells as donor nuclei was significantly higher (17.3% vs. 4.9%, P<0.05), suggesting the advantage of short-time cultured cells in supporting the development of reconstructed embryos. (Ⅱ) The morula/blastocyst rate of reconstructed embryos derived from medium cells (15-25μm) as donor nuclei was higher than that from large cells (25-33μm) and small cells (8-15μm)( 20.0% vs. 8.0%, 9.7%), indicating that reconstructed embryos from medium cells had a greater potentiality to develop into morula/blastocysts than those from small or large ones. (Ⅲ) The morula/blastocyst rate of reconstructed embryos from donor cells of SS (serum starvation) was lower than that from donor cells of NSS (non-serum starvation), but no significant difference was detected between SS and NSS(11.8% vs. 18.6%, P>0.05). (Ⅳ) Fetal fibroblasts treated with 0.05μmol/L colchicine exhibited a higher morula/blastocyst rate of reconstructed embryos than those treated with 0.10 μmol/L colchicine and untreated ones (27.5% vs. 12.1%, 17.1%), however, no significant difference among the three treatments was detected (P>0.05). (Ⅴ) The morula/blastocyst rate of reconstructed embryos from fetal fibroblasts transfected with GFP gene only was 3.1%, significantly lower than that from non-transgenic cells (3.1% vs. 20.4%, P<0.05). In conclusion, our results demonstrated that fetal fibroblasts of fewer passages, medium size could ensure a higher morula/blastocyst rate of reconstructed embryos. Serum starvation of donor cells might be unnecessary to the development of reconstructed embryos. Donor cells treated with 0.05μmol/L colchicine could facilitate the development of reconstructed embryos. Addi展开更多
为了通过脂质体介导的方法获得高效表达目的基因TLR4的绵羊胎儿成纤维细胞作为供体细胞,以便在胚胎移植前的体外筛选过程中确定优越的转基因供体细胞,从而提高体细胞核移植生产抗病转基因绵羊的效率。本研究通过优化脂质体与质粒载体的...为了通过脂质体介导的方法获得高效表达目的基因TLR4的绵羊胎儿成纤维细胞作为供体细胞,以便在胚胎移植前的体外筛选过程中确定优越的转基因供体细胞,从而提高体细胞核移植生产抗病转基因绵羊的效率。本研究通过优化脂质体与质粒载体的比例浓度,进而再去转染原代培养的绵羊胎儿成纤维细胞,经G418筛选,以EGFP(Enhanced Green Fluorescent Protein)作为报告基因,从形态学与分子水平鉴定出已经稳定表达目的基因:Toll样受体4(Toll Like Receptor4,TLR4)基因的细胞系。最终经过筛选与纯化得到3个表达目的基因TLR4的细胞克隆,经RT-PCR与相对荧光定量PCR分析,在第二代转染的细胞中TLR4的表达最高,相对于未转染的绵羊胎儿成纤维细胞升高了9.65倍(P<0.01),并藉此为最终制备抗病转基因羊新品种,从提供稳定表达TLR4基因的转基因供体细胞系角度奠定基础。展开更多
基金the National Key Basic Research '973' Program of China (Grant No. 2006CB102I00)
文摘To investigate the effects of different states of donor cells on the development of reconstructed sheep embryos, we designed five treatments of donor cells, including cell passage, cell size, serum starvation, colchicine treatment and gene transfection. Results are as follows: (Ⅰ) Compared with 16-18 passage cells, the morula/blastocyst rate of 5-7 passage cells as donor nuclei was significantly higher (17.3% vs. 4.9%, P<0.05), suggesting the advantage of short-time cultured cells in supporting the development of reconstructed embryos. (Ⅱ) The morula/blastocyst rate of reconstructed embryos derived from medium cells (15-25μm) as donor nuclei was higher than that from large cells (25-33μm) and small cells (8-15μm)( 20.0% vs. 8.0%, 9.7%), indicating that reconstructed embryos from medium cells had a greater potentiality to develop into morula/blastocysts than those from small or large ones. (Ⅲ) The morula/blastocyst rate of reconstructed embryos from donor cells of SS (serum starvation) was lower than that from donor cells of NSS (non-serum starvation), but no significant difference was detected between SS and NSS(11.8% vs. 18.6%, P>0.05). (Ⅳ) Fetal fibroblasts treated with 0.05μmol/L colchicine exhibited a higher morula/blastocyst rate of reconstructed embryos than those treated with 0.10 μmol/L colchicine and untreated ones (27.5% vs. 12.1%, 17.1%), however, no significant difference among the three treatments was detected (P>0.05). (Ⅴ) The morula/blastocyst rate of reconstructed embryos from fetal fibroblasts transfected with GFP gene only was 3.1%, significantly lower than that from non-transgenic cells (3.1% vs. 20.4%, P<0.05). In conclusion, our results demonstrated that fetal fibroblasts of fewer passages, medium size could ensure a higher morula/blastocyst rate of reconstructed embryos. Serum starvation of donor cells might be unnecessary to the development of reconstructed embryos. Donor cells treated with 0.05μmol/L colchicine could facilitate the development of reconstructed embryos. Addi
文摘为了通过脂质体介导的方法获得高效表达目的基因TLR4的绵羊胎儿成纤维细胞作为供体细胞,以便在胚胎移植前的体外筛选过程中确定优越的转基因供体细胞,从而提高体细胞核移植生产抗病转基因绵羊的效率。本研究通过优化脂质体与质粒载体的比例浓度,进而再去转染原代培养的绵羊胎儿成纤维细胞,经G418筛选,以EGFP(Enhanced Green Fluorescent Protein)作为报告基因,从形态学与分子水平鉴定出已经稳定表达目的基因:Toll样受体4(Toll Like Receptor4,TLR4)基因的细胞系。最终经过筛选与纯化得到3个表达目的基因TLR4的细胞克隆,经RT-PCR与相对荧光定量PCR分析,在第二代转染的细胞中TLR4的表达最高,相对于未转染的绵羊胎儿成纤维细胞升高了9.65倍(P<0.01),并藉此为最终制备抗病转基因羊新品种,从提供稳定表达TLR4基因的转基因供体细胞系角度奠定基础。
