共查询到19条相似文献，搜索用时 171 毫秒
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本试验通过比较供体成纤维细胞的不同血清饥饿培养天数、传代次数、冻存复苏等方面试验条件对重组胚发育的影响因素进行了深入的研究。结果表明：供体细胞血清饥饿0、1～3、4～6、7～9d之间重组胚卵裂率没有显著差异（P〉0.05），但囊胚率以饥饿1～3d的最高，与4～6和7～9d组别差异显著（P〈0．05）；以传代0、1～3、4～6、7～9代的细胞作为供体细胞，卵裂率没有显著差异（P〉0.05），桑椹胚率以传1～3代最高，差异显著（P〈0．05）；2代细胞解冻后的卵裂率显著高于4和8代细胞，而以2和6代冷冻解冻后细胞为供体，卵裂率并无明显差异，8代细胞的桑椹胚率显著低于其它组。本试验为提高供体成纤维细胞在卵母细胞中重新程序化及后续重组胚发育等相关研究提供参考。 相似文献
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小鼠皮肤成纤维细胞的体细胞核移植 总被引：1，自引：1，他引：0
取成年小鼠唇部皮肤进行培养，分离成纤维细胞并血清饥饿培养1周，用作核供体。对成年小鼠进行超排，取卵母细胞用作核受体，核移植重构胚经SrCl2激活处理6h后，同mM16培养液和小鼠输卵管上皮细胞共培养，把发育到早期囊胚的重构胚转移至小鼠胎儿成纤维细胞饲养层上，添加ES细胞条件培养液，消化分离ICM，然后接种培养，对孵出的ES细胞样集落进行鉴定培养。结果显示，小鼠唇部皮肤成纤维细胞为核供体，核移植重构胚2-细胞率为54．05％，桑椹胚率17．14％，囊胚率6．90％，对照组卵丘细胞的核移植重构胚2-细胞率为60．00％，桑椹胚率21．85％，囊胚率11．69％，但2种供体细胞在支持核移植重构胚发育能力上差异不显著。成纤维细胞重构囊胚中6个囊胚分离出ES细胞样集落，3个ES细胞样集落可稳定传代；对照组卵丘细胞重构囊胚中9个囊胚中分离出ES细胞样集落，5个ES细胞样集落可稳定传代。从核移植重构胚中分离出的ES细胞样集落具有岛状或巢状群体生长形态，生长旺盛的集落可自发分化成单个散在或片状存在的上皮样或梭形细胞，碱性磷酸酶检测为阳性，常规冻存复苏，仍显示ES细胞特征。 相似文献
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本研究以版纳微型猪近交系成年母猪为材料,采用冷胰酶消化法获得成年猪成纤维细胞后,进行细胞的生物学特征检测,研究其作为供体细胞对体细胞核移植效果的影响。结果表明,版纳微型猪近交系成年猪的成纤维细胞呈典型的成纤维细胞形态,细胞冻存前和复苏后存活率分别为97.2%和92.6%(P>0.05),生长曲线呈"S"形,细胞群体倍增时间为36h,体外培养14代后仍能保持正常核型。以其作为核移植供体细胞,核移植重构胚卵裂率、囊胚率及囊胚细胞数分别为61.9%、13.0%和37枚,移植了重构胚的3头代孕母猪均妊娠,并且有1头母猪产下1头正常的克隆猪。综上所述,利用版纳微型猪近交系成年猪能建立稳定的成纤维细胞系,该细胞系作为核移植供体细胞可获得版纳微型猪近交系克隆猪。 相似文献
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本研究通过比较胎儿成纤维细胞、颗粒细胞、卵丘细胞和不同性别猪胎儿成纤维细胞的核移植效果,探讨供体细胞的种类及性别对猪体细胞核移植重构胚胎发育潜力的影响。结果表明:胎儿成纤维细胞的融合率(64.74%)高于颗粒细胞的融合率(51.05%)和卵丘细胞的融合率(56.89%),但3种细胞的卵裂率及囊胚率差异不显著(P>0.05);胎儿成纤维细胞、颗粒细胞和卵丘细胞均可作为供体细胞用于构建猪体细胞核移植的重构胚。雄性胎儿成纤维细胞核移植重构胚的融合率和分裂率与雌性胎儿成纤维细胞重构胚的融合率和分裂率相比差异不显著(P>0.05),但雄性胎儿成纤维细胞核移植重构胚的囊胚率显著低于雌性胎儿成纤维细胞核移植重构胚的囊胚率(P<0.05)。 相似文献
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研究采用不同传代的培养方法和不同方法处理及不同培养分离法探讨胎儿成纤维细胞的处理方法对猪体细胞胚胎发育潜力的影响。结果表明:(1)100%长满汇合胎儿成纤维细胞的核移植融合率高于70%～80%的胎儿成纤维细胞(P<0.05),分裂率高于血清饥饿培养的胎儿成纤维细胞(P<0.05),但囊胚率差异不显著(P>0.05);(2)猪胎儿成纤维细胞冷冻-解冻后的核移植分裂率和囊胚发育率均显著低于新鲜和4℃冷藏的细胞(P<0.05),但融合率无显著差异(P>0.05),表明猪胎儿成纤维细胞解冻后不宜直接进行核移植;(3)采用组织块法和酶消化法分离得到的胎儿成纤维细胞所构建的重构胚胎在融合率、分裂率和囊胚率方面没有显著差异(P>0.05)。表明100%长满汇合培养是较好的猪胎儿成纤维细胞培养处理方法;猪胎儿成纤维细胞解冻后不宜直接进行核移植;组织块法和酶消化法均可用于分离培养猪体细胞核移植的胎儿成纤维细胞。 相似文献
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供体细胞对猪体细胞克隆胚胎早期发育的影响 总被引：1，自引：1，他引：1
以中国农业大学实验用小型猪香猪胎儿成纤维细胞、成年耳成纤维细胞和颗粒细胞3种细胞系为供体细胞进行核移植。比较了血清饥饿法和接触抑制法处理胎儿成纤维细胞诱导进入G0／G1期的效率，发现二者差异不显著（P〉0．05），血清饥饿2d和4d差异不明显，同样接触抑制2d和4d差异也不显著（P〉0．05）。系统研究了影响克隆胚胎发育的供体因素：血清饥饿与否、细胞形态、细胞类型及个体差异等，结果表明：血清饥饿处理对克隆胚的早期发育没有明显的促进作用；圆形光滑细胞有利于细胞融合，对早期发育无显著影响（P〉0．05）；不同个体、不同类型的供体细胞对克隆胚囊胚发育率有一定的影响。 相似文献
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优化山羊体细胞核移植方案的研究 总被引：4，自引：1，他引：4
以乳腺细胞、胎儿成纤维细胞和颗粒细胞为供体细胞进行核移植，比较了供体细胞类型、细胞冷冻及核移植的重建方法（胞质内注射、电融合）对重构胚早期发育的影响。结果：（1）乳腺细胞支持重组胚的发育能力（囊胚率7．14％）显著低于成纤维细胞（16．19％）和颗粒细胞（19．01％）（P〈0．05），卵裂率无显著差异（P〉0．05）；（2）乳腺上皮细胞构建重组胚时电融合法的效率（69．52％）极显著高于胞质注射法（59．20％）（P〈0．01）；成纤维细胞的重组成功率、卵裂率和囊胚率在两种方法间均无显著差异（P〉0．05）；在颗粒细胞，胞质注射法重组成功率（82．17％）显著高于电融合法（50．99％）（P〈0.05），其囊胚率也稍高于电融合法，但无显著差异（P〉0.05）；（3）上述3种供体细胞在冻融后支持重组胚发育力方面无显著差异（P〉0.05）。结论：在山羊体细胞核移植中，上述3种细胞支持重组胚的发育力以成纤维细胞和颗粒细胞较好；细胞冷冻对其无显著影响；在构建重组胚方法上，乳腺细胞以电融合法为宜，颗粒细胞是胞质注射法优于电融合法，而成纤维细胞两种方法均可。 相似文献
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系统探讨了水牛体细胞核移植的各种影响因素，并初步建立了水牛体细胞核移植的一整套程序。体外成熟培养22～24h的水牛卵母细胞去核后，将经血清饥饿(0.5％FBs)培养2～9d、0．1mg／L Aphidicolin(APD)培养 0．5％FBs培养2～9d或一般培养法(10％FBS)培养的水牛耳皮成纤维细胞或颗粒细胞，直接注射到去核的卵母细胞质中，或注射到卵周隙中再经电融合(100V／mm，15μs，电脉冲3次)构建重构胚。重构胚经化学激活后(5pmol／L离子霉素5min，2mmol／L6-DMAP3h)培养7～8d，评定其胚胎发育能力。耳皮成纤维细胞和颗粒细胞经0．1mg／L APD 0．5％FBs培养处理后的重组胚卵裂率，均极显著高于血清饥饿和一般培养处理的同种供体细胞(P＜0.01)，但囊胚发育率无显著差异(P＞0．05)。耳皮成纤维细胞和颗粒细胞经0.1mg／L APD 0.5％FBS处理后进行核移植的分裂率和发育率均无显著差异(63．06％比58．70％，P＞0．05)。以水牛颗粒细胞为核供体时，电融舍法的重构胚分裂率显著高于胞质内注入法(P＜0.05)，囊胚发育率无显著差异(P＞0.05)。培养3代和6代的水牛颗粒细胞以及培养6代和10代的耳皮成纤维细胞，其具有正常二倍染色体的细胞比例均无显著差异(P＞0.05)；以这2种细胞不同培养代数作供体进行核移植时，各代之间核移胚的体外分裂率、囊胚发育率无显著差异P＞0.05)。这些结果表明：(1)水牛耳皮成纤维细胞和颗粒细胞经培养传代所建立起来的细胞系相对比较稳定；(2)0.1mg／L APD预培养处理供体细胞能提高水牛体细胞核移植的效果，但血清饥饿培养则无作用；(3)水牛耳皮成纤维细胞和颗粒细胞均可作供核细胞，核移植后都能得到体细胞克隆的囊胚，但前者的效果略优于后者，且其核移植效果不受供核细胞培养代数的影响；(4)电融合核移植胚胎的发育率高于胞质内直接注入法，但两者的总体效率相似。 相似文献
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Ting-Yu ZHANG Jian-Jun DAI Cai-Feng WU Xiao-Long GU Liang LIU Zhi-Qiang WU Yi- Ni XIE Bin WU Hui-Lan CHEN Yao LI Xue-Jin CHEN De-Fu ZHANG 《Animal Science Journal》2012,83(2):103-110
To optimize somatic cell nuclear transfer (SCNT) procedures in mini-pigs, the present study was designed to examine the effects of donor cell types and aphidicolin (APC) treatment on in vitro development of reconstructed embryos. Oviduct epithelial cells (OEC), ear fibroblast cells (EFC) and cumulus cells (CC) derived from mini-pigs were treated with serum starvation only or serum starvation followed by treatment of 0.1 µg/mL APC. The reconstructed embryos were cultured for 7 days to evaluate their developmental competency. Cleavage and blastocyst formation rates of reconstructed embryos derived from the OEC by APC treatment were significantly higher than the serum starvation (61.82% vs. 56.25%, 24.55% vs. 17.86%; P < 0.05). The cleavage rate from the EFC was significantly increased by APC treatment compared to serum starvation only (63.36% vs. 57.01%; P < 0.05). In the ooctyes with the CC, the reconstructed embryos could yield high blastocyst formation rate by APC treatment (29.63%; P < 0.05). In the presence of APC, CC gave rise to the highest cleavage and blastocyst formation rates among the three cell types. Therefore, our results suggest that treatment of CC with serum starvation plus APC prior to nuclear transfer is more suitable in SCNT of mini-pigs. 相似文献
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供体细胞培养处理方法对水牛核移植效果的影响 总被引：4，自引：1，他引：4
以经常规培养法 (DMEM 10 % FCS)、血清饥饿法 (DMEM 0 .5 % FCS培养 5～ 10 d)和 Apidicolin- APD结合血清饥饿法 (0 .1mg/ L APD培养 2 4 h,DMEM 0 .5 % FCS培养 1～ 18d)培养处理的水牛卵巢颗粒细胞和水牛成体耳部成纤维细胞作供核 ,分别采取带下注核法和胞质内注核法进行核移植。同一供核细胞各处理组间的核移植胚融合率 (以颗粒细胞作供核 )以及重组胚的囊胚发育率无明显差异 (P>0 .0 5 ) ,但经 APD 0 .5 % FCS培养处理供体细胞核移植后的分裂率显著高于其他组 (P<0 .0 5 )。用 7%乙醇处理的成体耳部成纤维细胞进行核移植 ,其重组胚的分裂率和囊胚发育率与对照组 (不含乙醇 )均无明显差异 (P>0 .0 5 )。结果表明 ,(1)血清饥饿处理水牛供体细胞对其核移植效果没有影响 ;(2 ) DNA合成抑制剂 APD结合血清饥饿培养处理水牛颗粒细胞和成体耳部成纤维细胞 ,可提高其核移植效果 ;(3)乙醇预激活处理水牛成体耳部成纤维细胞 ,对其核移植效果没有影响 相似文献
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Zhao ZJ Ouyang YC Nan CL Lei ZL Song XF Sun QY Chen DY 《The Journal of reproduction and development》2006,52(3):449-459
This study was designed to examine the ability of rabbit metaphase II oocyte cytoplasm to support the development of interspecies nuclear transfer embryos reconstructed using donor nuclei from different species. Skin fibroblast cells from a camel and Tibetan antelope were used as donor nuclei. As a first step, we investigated the efficiency of different activation protocols by comparing the parthenogenetic development of rabbit oocytes. The protocol that yielded the highest blastocyst rate was used to activate the reconstructed embryos in nuclear transfer experiments. In addition, the effect of donor cell serum starvation on the development of the reconstructed embryo was also examined. More than half of the karyoplast-cytoplast couplets could be fused, and about one third of the reconstructed embryos were capable of completing first cleavage, regardless of the species of donor nuclei. Some of the cleaving reconstructed embryos were even capable of progressing further and developing to the blastocyst stage (1.4-8.7% for the Tibetan antelope and 0-7.5% for the camel, respectively). Our results suggest that the mechanisms regulating early embryo development may be conserved among mammalian species and some factors existing in rabbit oocyte cytoplasm for somatic nucleus reprogramming and dedifferentiation may not be species-specific. Rabbit oocyte cytoplasm can reprogram donor nuclei regardless of the origin of the nucleus and support in vitro development to an advanced stage. 相似文献
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Tomii R Ogawa B Imai N Handa Y Sasayama N Shirasu A Nagashima H 《The Journal of reproduction and development》2011,57(2):273-279
The aim of the present study was to optimize the conditions for in vitro development and postvitrification survival of somatic cell cloned feline embryos. To determine the effects of cell cycle synchronization of the nuclear donor cells, we cultured preadipocytes under serum starvation or conventional conditions. After two days in serum starvation culture, the proportion of synchronized donor cells at the G0/G1 phase was 91.6%. This was significantly higher than the proportion of non-synchronized cells in the proliferative phase (72.6%, P<0.05). The in vitro development of somatic cell nuclear transfer (SCNT) embryos reconstructed using donor cells treated under serum starvation conditions (normal cleavage rate of 65.7%, 46/70, and blastocyst formation rate of 20.0%, 14/70) was comparable to that of the serum supplemented group (52.5%, 31/59, and 20.3%, 12/59). Use of in vitro or in vivo matured oocytes as recipient cytoplasts equally supported development of the SCNT embryos to the blastocyst stage (11.9%, 5/42, vs. 9.5%, 2/21). SCNT-derived blastocysts were vitrified using the original minimum volume cooling (MVC) or the modified (stepwise) MVC method. Although none (n=10) of the SCNT blastocysts survived following vitrification by the original MVC method, the stepwise MVC method resulted in 100% survival after rewarming (n=11). In conclusion, we demonstrated that feline somatic cell cloned embryos with a high developmental ability can be produced irrespective of cell cycle synchronization of donor cells using either in vivo or in vitro matured oocytes. Furthermore, by utilizing a stepwise vitrification method, we showed that it is possible to cryopreserve cloned feline blastocysts. 相似文献
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水牛体细胞核移植方法比较及激活前的时间间隔对全细胞胞质内注射法核移植效果的影响 总被引：1，自引：0，他引：1
本研究旨在比较水牛2种体细胞核移植(Somatic Cell Nuclear Transfer,SCNT)方法的效果以及激活前的时间间隔对全细胞胞质内注射法(Whole-Cell Intracytoplasmic Microinjection,WCICSI)核移植效果的影响.采用水牛胎儿成纤维细胞作为供核,比较了透明带下注核法(Perivitelline Microinjection,PM)和WCICSI核移植效果.另外,试验了不同类型的供体细胞进行全细胞胞质内注射后与激活前的受体胞质的最适宜作用时间.结果,WCICSI构建核移植重构胚的成功率显著高于PM(87.1%vs 81.1%,P＜0.05),虽然其重构胚的分裂率极显著低于PM(49.5%vs 71.8%,P＜0.01),但囊胚率、核移植的效率无显著差异(P＞0.05).卵丘细胞和胎儿成纤维细胞在注射后3 h激活,重构胚的囊胚发育率最高;颗粒细胞注射后与激活前的最佳时间间隔可在1.5～3 h,但3 h是最佳的作用时间.结果表明,(1)WCICSI可用于水牛体细胞核移植的研究;(2)水牛胞质内注射供体细胞后3 h进行激活,核移植重构胚的发育效果最好. 相似文献
16.
Miyamoto K Hoshino Y Minami N Yamada M Imai H 《The Journal of reproduction and development》2007,53(2):237-246
The relationship between donor cell cycle and the developmental ability of somatic cell nuclear transfer (SCNT) embryos has not fully been elucidated. Donor cells that are usually prepared by serum starvation or confluent-cell culture for SCNT represent a heterogeneous population that includes mainly G0 phase cells, other cells in different phases of the cell cycle and apoptotic cells. In this study, we compared the developmental ability of porcine SCNT embryos reconstructed from G0 phase cells (G0-SCNT embryos) and strictly synchronized-G1 phase cells (G1-SCNT embryos), and examined the developmental rates and timing of first DNA synthesis. The G0 phase cells were synchronized by confluent culture, and the G1 phase cells were prepared from actively dividing M phase cells. The G1-SCNT embryos showed a significantly higher (P<0.05) developmental rate to the blastocyst stage per cleaved embryo (59%) than the G0-SCNT embryos (43%). Moreover, initiation of first DNA synthesis and cleavage occurred significantly earlier in the G1-SCNT embryos than in the G0-SCNT embryos. Delay of initiation of first DNA synthesis in the SCNT embryos by aphidicolin resulted in decreased developmental rates to the blastocyst stage without any effect on cleavage rates. Our data demonstrates that synchronized-G1 phase cells can be used as donor cells for SCNT embryos and that earlier initiation of first DNA synthesis may be important for subsequent development of SCNT embryos. The SCNT system using G1-synchronized cells, in terms of their highly uniform and viable cell states, can be useful for studying the reprogramming processes and embryonic development of SCNT embryos. 相似文献
17.
S-L Lee BM Kumar J-G Kim S-A Ock B-G Jeon S Balasubramanian S-Y Choe G-J Rho 《Reproduction in domestic animals》2007,42(1):44-52
The present study compared the efficiency of transgenic (TG) cloned embryo production by somatic cell nuclear transfer (SCNT) with fetal-derived fibroblast cells (FFCs) which were transfected with pEGFP-N1 to in vitro-fertilized (IVF), parthenogenetic and SCNT counterparts by evaluating the rates of cleavage and blastocyst formation, apoptosis rate at different developmental stages, cell number, ploidy and gene expression in blastocysts. In SCNT and TG embryos, the rates of cleavage and blastocyst formation were significantly lower (p < 0.05) than those of IVF controls, but it did not differ between SCNT and TG embryos. In IVF control, 86.7% embryos displayed diploid chromosomal complements and the rates were significantly (p < 0.05) higher than those of SCNT and TG embryos. Most TG embryos (79%) with FFCs expressed the gene by both PCR and under fluorescence microscopy. The expression of apoptosis by TUNEL was first detected at six to eight cell stages in all embryos of IVF, SCNT and TG groups, but the expression rate at each developmental stages was significantly higher (p < 0.05) in SCNT and TG embryos than in IVF counterparts. The expression rate in inner cell mass (ICM) of TG embryos was significantly higher (p < 0.05) than in SCNT and IVF embryos. These results indicate that the high occurrence of apoptosis observed in SCNT and TG embryos compared with IVF counterparts might influence the developmental competence. Moreover, the SCNT embryos derived using non-transfected donor cells exhibited a lower apoptosis expression in ICM cells than in TG embryos derived using pEGP-N1-transfected donor cells suggesting a possible role of negative gene effect in TG embryos. 相似文献
18.
试验采用脂质体转染法与电穿孔法,以携带绿色荧光蛋白（GFP）-新霉抗性（neo-）双标记基因的pMSCV质粒转染胎牛耳成纤维细胞为供体与体外成熟的牛卵母细胞为受体构建克隆胚。研究了体外成熟培养液中添加EGF（表皮生长因子）对转基因胚的影响,不同转染方法构建供体细胞对重构胚发育的影响和在不同体外培养系统中的发育效果。结果显示,体外成熟培养液中添加EGF 30 ng/mL组的卵母细胞成熟率最高,但对后期转基因重构胚的囊胚发育率的影响,以添加EGF 20 ng/mL组的最高;以胎牛耳成纤维细胞为供体细胞,不同转染方法转染供体细胞构建重构胚,其囊胚发育率差异不显著（P>〖JP2〗0.05）;mSOFaa+颗粒细胞单层细胞共培养体系中的转基因囊胚发育率最好,该体系更适合体细胞核移植法生产转基因牛胚胎。 相似文献
19.
Synchronization of the donor cell cycle is an important factor for successful animal cloning by nuclear transfer. To improve the efficiency of porcine cloning, in the present report, we evaluated effects of contact inhibition, serum starvation and roscovitine treatment of donor cells on in vitro and in vivo developmental potency of cloned porcine embryos. Fibroblasts derived from a porcine foetus at day 30 of gestation were isolated and cultured to 70% confluency. Then, cells were either cultured to 100% confluency for contact inhibition, or cultured in 0.5% serum for 72 h for serum starvation or with 15 μm roscovitine for 24 h. Cells were most effectively synchronized at G0/G1 in the serum starvation group (87.5%) compared with the contact inhibition and roscovitine treatment groups (76.3% and 79.9% respectively p < 0.05). However, after somatic cell nuclear transfer followed by in vitro culture, the serum starvation group showed a significantly lower blastocyst formation rate (5.6%) compared with the contact inhibition and roscovitine treatment groups (11.6% and 20.0% respectively). Differential expression of apoptosis‐related genes and the level of apoptosis in each treatment group explain the variation in developmental competence among the groups. Significantly higher level of apoptosis was observed in the serum starvation group. On the other hand, the roscovitine treatment group shows the lowest level of apoptosis and the best in vitro development among the groups. Cloned embryos derived from roscovitine‐treated donor cells were transferred to surrogate pigs. Three healthy live piglets were produced. In conclusion, we suggest that roscovitine treatment of donor cells improves development of cloned porcine embryos and can raise the efficiency of cloned piglet production. 相似文献