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[目的] 研究胞外冷冻保护剂海藻糖对玻璃化冷冻-解冻后牛未成熟卵母细胞形态、活性线粒体分布和核成熟的影响。[方法] 将未成熟卵母细胞随机分为新鲜组、不同浓度海藻糖（0.25、0.5和1 mol/L）组和0.5 mol/L蔗糖组共5组。新鲜组作为玻璃化冷冻的对照组,海藻糖和蔗糖组均采用两步法进行玻璃化冷冻和解冻处理。在冷冻的第1步不添加海藻糖和蔗糖,在冷冻的第2步和解冻的第1步分别添加对应浓度的海藻糖和蔗糖,在解冻的第2步海藻糖和蔗糖浓度均减半。解冻后,统计卵母细胞形态正常率;用JC-1染色检测卵母细胞的活性线粒体分布区域和荧光强度;体外成熟培养24 h后,统计卵母细胞的核成熟率。[结果] 玻璃化冷冻组卵母细胞的形态正常率和核成熟率均显著低于新鲜组卵母细胞（P<0.05）,0.5 mol/L海藻糖组卵母细胞形态正常率和核成熟率均显著高于0.5 mol/L蔗糖组及0.25和1 mol/L海藻糖组（P<0.05）;0.5 mol/L海藻糖组卵母细胞的活性线粒体均匀分布在细胞膜内侧区域,在绿光和蓝光下分别呈现强的红色荧光和黄绿色荧光,且荧光强度高于其他玻璃化冷冻组卵母细胞,但仍低于新鲜组卵母细胞;0.25 mol/L海藻糖组卵母细胞的活性线粒体分布区域少于、荧光强度低于0.5 mol/L海藻糖组,蓝光下其荧光为绿色并呈现不连续的散点分布,0.5 mol/L蔗糖组和1 mol/L海藻糖组卵母细胞活性线粒体分布区域极少,蓝光下其荧光为暗绿色。[结论] 0.5 mol/L海藻糖是进行牛未成熟卵母细胞玻璃化冷冻的最佳浓度。 相似文献
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为了探讨毛细玻管玻璃化冷冻法(GMP)对牛卵母细胞冷冻效果的影响,试验采用毛细玻管玻璃化冷冻法冷冻不同发育阶段的牛卵母细胞,并且对不同预处理方式和玻璃化时间对玻璃化冷冻牛卵母细胞解冻后形态及体外受精卵裂率的影响进行了比较.结果表明:采用毛细玻管玻璃化冷冻法冷冻GV期和体外培养6 h、18 h、22 h各发育阶段的卵母细胞,解冻后体外受精后卵裂率分别是36.67%、40.98%、41.27%、52.38%,前三者之间差异不显著(P>0.05),前三者与培养22 h卵母细胞(52.38%)和对照细胞(68.42%)差异极显著(P<0.01);采用不同浓度的稀溶液预处理卵母细胞,3%乙二醇稀溶液预处理玻璃化前牛卵母细胞可分别获得较高的卵裂率(36.96%);卵母细胞在玻璃化溶液中暴露时间越长受到损伤越严重,暴露30 s能获得最好的玻璃化冷冻效果. 相似文献
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《畜牧与兽医》2017,(5):58-62
为了研究不同冷冻载体制备方法及其对牛未成熟卵母细胞发育能力的影响,以牛未成熟卵母细胞为实验材料,分别探究开放式拉长细管(OPS,open pulled straw)和玻璃微管(GMP,glass micropipette)的制备方法,并以OPS、GMP和冷冻叶片为冷冻载体玻璃化冷冻牛未成熟卵母细胞,解冻后经体外成熟培养和体外受精,统计形态正常率、成熟率、卵裂率及囊胚率。结果显示:以简易小酒精灯为热源,以细管为原材料可以制备出适用的OPS冷冻载体;以酒精喷灯为热源,以细玻璃管为原材料可以制备出适用的GMP冷冻载体。OPS和GMP组形态正常率分别为(74.3%±1.8)%和(72.5%±2.6)%;无显著差异(P0.05),上述二组均显著低于冷冻叶片组(82.1%±1.3)%,P0.05,但三组间成熟率、卵裂率和囊胚率均无显著差异(P0.05)。研究表明,分别以简易小酒精灯和酒精喷灯为热源,以细管和细玻璃管为原材料可以成功制备出OPS和GMP载体;以OPS、GMP和冷冻叶片为冷冻载体均可成功地玻璃化冷冻牛未成熟卵母细胞。 相似文献
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二甲基亚砜(DMSO)、丙二醇(PROH)、乙二醇(EG)和甘油(GL)4种冷冻保护剂程序化冷冻牛GV期卵母细胞的结果表明,EG和PROH的保护效果比GL和DMSO好。4种不同冷冻方法冷冻保存牛GV期卵母细胞,比较解冻后卵母细胞的体外成熟率、受精后卵裂率。结果表明,在程序化冷冻法与细管玻璃化法(Straw)之间的差异不显著(P>0.05),在开放式拉管法(OPS)与毛细玻管法(GMP)之间的差异不显著(P>0.05);但OPS和GMP与程序化冷冻法和Straw之间的差异极显著(P<0.01)。玻璃化冷冻效果优于程序化冷冻。说明GMP和OPS玻璃化冷冻优于Straw玻璃化冷冻。说明可以采用GMP方法冷冻保存牛GV期卵母细胞。 相似文献
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《黑龙江畜牧兽医》2014,(1)
为了探讨小鼠卵巢组织玻璃化冷冻时适宜的平衡时间和冷冻保护剂二甲基亚砜(DMSO)的适宜浓度,试验采用不同平衡时间(10 min、15 min、20 min)及不同浓度(15%、20%、25%)的DMSO作为冷冻保护剂对2月龄昆明小白鼠的卵巢组织进行处理,处理后的卵巢组织采用玻璃化冷冻法进行冷冻,用解剖法采集冷冻解冻后的卵巢卵母细胞,通过对卵母细胞染色及体外成熟培养判定卵巢的冷冻效果。结果表明:以平衡时间为20 min的试验组小鼠卵巢冷冻效果较好,其卵母细胞存活率为65.0%,卵母细胞成熟率为27.4%;DMSO浓度则以20.0%为宜,冷冻解冻后卵巢内卵母细胞染色后存活率为66.7%,体外培养后卵母细胞成熟率为38.3%。 相似文献
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本试验通过牛卵母细胞玻璃化冷冻过程中采用载体、冷冻时卵母细胞所带颗粒细胞层数和其成熟培养时间这3个方面对牛卵母细胞的玻璃化冷冻进行了探讨。(1)不同载体的对比:玻璃OPS管和塑料OPS管冷冻效果较好。玻璃OPS管冷冻卵母细胞,解冻后形态正常率、体外受精后卵裂率和囊胚率分别为91.2%、41.3%和14.52%。塑料OPS管冷冻卵母细胞,解冻后形态正常率、体外受精后卵裂率和囊胚率分别为89.09%、40.90%和14.54%。(2)保留2￣3层颗粒细胞的卵母细胞玻璃化冷冻的冷冻效果较好,其冷冻解冻后形态正常率、体外受精后卵裂率和囊胚率分别为90.79%、40.13%和15.13%。(3)体外成熟培养22h的卵母细胞冷冻效果较好,其冷冻解冻后形态正常率、体外受精后卵裂率和囊胚率分别为94.14%、41.80%和15.23%。 相似文献
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《中国畜牧杂志》2017,(8)
本实验以猪GV期卵母细胞为模型,旨在研究乙二醇(EG)联合丙二醇(PROH)作为渗透性冷冻保护剂的冷冻保存方案。将卵母细胞在室温(25℃)和生理温度(39℃)2种冷冻操作条件下,采用2.5%EG+2.5%PROH直接处理10 min(预平衡方式Ⅰ)或分步以3.75%EG+3.75%PROH、7.5%EG+7.5%PROH 2种溶液各处理2.5 min(预平衡方式Ⅱ)进行预平衡,然后Cryotop法玻璃化冷冻保存,解冻后分析其存活、体外成熟及孤雌发育能力。结果表明:在2种温度下,预平衡方式Ⅰ组卵母细胞解冻后2 h的存活率均显著高于预平衡方式Ⅱ组(P0.05),但存活卵母细胞成熟培养后,在各冷冻组间的存活率无明显差异(P0.05);冷冻组卵母细胞的核成熟也与新鲜卵母细胞无显著性差异(P0.05);在相同温度下,预平衡方式Ⅰ组的卵裂率和囊胚发育率均显著高于预平衡方式Ⅱ组(P0.05);当采用同一预平衡方式时,39℃的冷冻操作条件所获卵裂率和囊胚发育率显著低于25℃(P0.05);此外,各组间囊胚细胞数均无明显差异(P0.05)。综上所述,EG联合PROH用于猪GV期卵母细胞的Cryotop法玻璃化冷冻保存时,25℃冷冻操作条件下,采用预平衡方式Ⅰ可获得较高的冷冻存活率及囊胚发育率。 相似文献
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《中国兽医学报》2014,(6):999-1004
本试验旨在探讨玻璃化冷冻对牛体外成熟卵母细胞(MⅡ期)组蛋白乙酰化和膜蛋白CD9表达的影响。牛MⅡ期卵母细胞采用OPS法冷冻,即卵母细胞于10%EG+10%DMSO溶液中预处理30s,然后再移入玻璃化溶液EDFSF30中处理25s,以OPS为承载器投入液氮中。毒性组卵母细胞未投入液氮,其他过程与冷冻组相同,新鲜牛MⅡ期卵母细胞为对照组。卵母细胞解冻后,利用免疫荧光染色法检测存活细胞DNA组蛋白乙酰化;qRT-PCR和Western blot检测CD9mRNA蛋白的表达。结果表明:冷冻组卵母细胞形态正常率(93.8%)和存活率(92.7%)显著低于毒性组(100.0%,97.2%)和对照组(100.0%,98.5%)(P<0.05),而毒性组与对照组之间无显著差异。超低温冷冻后,卵母细胞DNA组蛋白乙酰化水平显著上升(P<0.05),CD9mRNA与蛋白表达显著降低(P<0.05)。以上显示,玻璃化冷冻不但降低了牛体外成熟卵母细胞的存活率,而且改变了DNA组蛋白乙酰化和膜蛋白CD9表达水平。 相似文献
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卵母细胞冷冻保存具有广泛而潜在的应用价值.试验主要分析了不同冷冻及解冻方法对绵羊GV期和MII卵母细胞发育效果的影响.GV期卵母细胞程序化冷冻解冻后形态正常率(54.8%)以及体外培养成熟率(14.7%)均显著低于细管玻璃化(71.8%,29.5%;P＜0.05)和OPS玻璃化(78.3%、35.4%;P＜0.05),卵裂率OPS玻璃化高于细管玻璃化,但差异不显著(26.1%,16.7%;P＞0.05);MII期卵母细胞形态正常率程序化冷冻显著低于细管玻璃化和OPS玻璃化冷冻(67.2%,77.6%,84.8%;P＜0.05),卵裂率OPS玻璃化显著高于程序化冷冻法(31.3%,10.3%;P＜0.05);3种不同方法冷冻不同发育时期卵母细胞成熟率和卵裂率与对照组相比较均差异极显著(P＜0.01).解冻后卵母细胞形态正常率三步与五步解冻法极显著高于一步解冻法(85.9%,82.7%,63.1%; P＜0.01);成熟率为三步法和五步法显著高于一步法(10.8%,26.9%,25.3%;P＜0.05);卵裂率三步法和五步法高于一步法,但没有差异显著性(14.3%,23.9%,21.1%; P＞0.05). 相似文献
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本试验通过荧光染色的方法建立了未成熟牛卵母细胞在体外培养过程中第1次减数分裂的各个阶段的参考判定图谱;根据这个标准来观察毛细玻璃管(GMP)玻璃化冷冻对卵母细胞核成熟和冷冻损伤的影响。结果表明,从屠宰场废弃的卵巢表面卵泡内抽取的COCs,70%处于生发泡期,12.5%生发泡开始破裂,7.5%已开始浓缩,这说明从屠宰场获得的COCs有较高的异质性;卵母细胞在成熟培养22h时收获排出第一极体的卵母细胞,可得到丰度较高的极体-胞质染色体对称、紧密相邻的成熟卵母细胞;GMP玻璃化冷冻损伤主要有2种表现形式,首先,直接影响膜结构的完整性,包括细胞膜和核膜,这可从退化的细胞比例看出(8～24h,有21.9%～27.2%的细胞处于该阶段),其次,影响CONDENSED向MⅠ期的过渡,这可从处于CONDENSED卵母细胞的比例看出(8～24h,有24.1%～34.3%的细胞处于该阶段)。 相似文献
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本试验对猪精液冷冻保护液中添加咖啡因的作用进行了研究,并优化冷冻－解冻程序,提高0.5 mL细管猪精液冷冻解冻后的质量。在预先设计稀释液配方的基础上,使咖啡因终浓度为0、0.2、0.4、0.6 mg/mL,选择最佳咖啡因浓度,选出最优组合与传统的TCG稀释液和商业用Androhep〖XC1.TIF〗CryoGuardTM冷冻稀释液进行比较,比较3种不同的冷冻曲线对猪冷冻精液解冻后精子品质的影响,最后对38 ℃下30 s、50 ℃下13 s 2种解冻方法进行比较。结果表明,咖啡因浓度为0.2、0.4 mg/mL的精子冷冻后活力、质膜完整率、顶体完整率显著高于0、0.6 mg/mL（P＜0.05）,最佳添加浓度为0.2 mg/mL;预设计的稀释液配方及冷冻方案优于传统的TCG法（P＜0.05）,但与Androhep〖XC1.TIF〗CryoGuardTM稀释液(美国商业用)有一定差距（P＜0.05）;A曲线在猪精液冷冻－解冻后活力、质膜完整率和顶体完整率方面均显著优于B和C冷冻曲线（P＜0.05）;50 ℃水浴解冻13 s显著优于38 ℃解冻30 s（P＜0.05）。 相似文献
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Jakub Vozaf Alexander V. Makarevich Andrej Balazi Jaromir Vasicek Andrea Svoradova Lucia Olexikova Peter Chrenek 《Animal Science Journal》2021,92(1):e13670
The aim of our study was to examine effects of the length of semen equilibration as well as two freezing techniques on ram sperm post-thaw quality. The ejaculates of Wallachian sheep rams (n = 12) were collected by an electro-ejaculation, equilibrated in a Triladyl® (0, 2, 4, 6, and 8 h) containing glycerol and egg yolk and frozen by programmable freezing (PF) or manual freezing (MF). After thawing, sperm samples were subjected to the motility (computer-assisted sperm analysis [CASA]), viability (SYBR-14/PI), and fertilizing ability (FA) (in vitro penetration/fertilization test on bovine oocytes) assays. It was found that the equilibration of 6 h (E-6) ensured higher post-thaw sperm motility and progressive movement compared with other lengths tested, irrespective of a freezing technique. The E-6 sperm viability did not differ between PF and MF but was lower (P < 0.05) than control. Sperm FA (E-6) was similar in PF (60.44%) and MF (62%) but slightly lower than in fresh (72.8%). Our data demonstrate that the use of MF was comparable with PF, which can be applied in the field conditions without need in a piece of cost-expensive equipment, which can greatly benefit the gene bank of animal genetic resources. 相似文献
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Gustafsson H., U. Jaakma and M. Shamsuddin: Viability of fresh and frozen-thawed biopsied bovine embryos. Acta vet. scand. 1994,35,217-222.– Bovine embryos were biopsied using a simplified splitting technique and frozen-thawed according to a standard method with glycerol as cryoprotectant. The viability of fresh and frozen-thawed biopsied and intact embryos were evaluated after in vitro culture, by means of fluorescence test or following transfer to recipients. The survival rates after in vitro culture of fresh intact and biopsied embryos and of frozen-thawed intact and zona free embryos were not significantly different (70%, 60%, 68% and 52%, respectively), but significantly reduced for bipsied frozen-thawed embryos (16%) (p≤0.05). The pregnancy results after transfer of biopsied frozen-thawed embryos were also significantly lower (8%) compared to fresh biopsied embryos (39%) (p≤0.05). Both intact and biopsied embryos fluoresced after incubation with diacetylfluorescin but with higher intensity for the intact embryos. It is suggested that the reduced survivability for the frozen-thawed biopsied embryos might be caused by combined effects of the loss of the zona pellucida and the reduction of cells as a result of the simplified biopsy technique. It is concluded that improved biopsy and/or freezing techniques must be used if biopsied embryos have to be frozen. 相似文献
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The post-thaw motility and the acrosome integrity of semen from 4 boars frozen with a programmable freezing machine, in mini (0.25 ml) and maxi (5 ml) plastic straws and in 10 x 5 cm Teflon FEP-plastic bags (0.12 mm thick, 5 ml), were compared. The freezing of the semen was monitored by way of thermo-couples placed in the straws and the bags. Three freezing programmes were used, namely A: from +5 degrees C, at a rate of 3 degrees C/min, to -6 degrees C, held for 1 min at -6 degrees C, and followed by a cooling rate of 20 degrees C/min to -100 degrees C; B: a similar curve except that there was no holding time at -6 degrees C and that the cooling rate was 30 degrees C/min, and C: from +5 degrees C to -100 degrees C, with a cooling rate of 35 degrees C/min, followed by storage in liquid N2. Despite the freezing curve assayed, both the mini-straws and the bags depicted much shorter freezing point plateaus as compared to the maxi-straws. Post-thaw sperm motility as well as the amount of normal apical ridges were equally significantly higher when semen was frozen in mini-straws or in bags than in maxi-straws. Significant differences in these post-thawing parameters were obtained between the freezing curves used. The stepwise freezing procedure A appeared as the best alternative for boar semen, considering this in vitro evaluation. 相似文献