培养液中不同浓度肝素对蓝狐精子体外获能的影响

采用上游法分离优化精子,以mTyrod's液作为基础培养液检测培养液中不同质量浓度肝素对蓝狐精子体外获能的影响,试验设4个肝素质量浓度:0,10,20,50 μg/mL,38.5℃、5%C02培养箱进行孵育,获能培养时间为6h.利用考马斯亮蓝染色法检测精子顶体反应率,伊红-苯胺黑染色法检测活精子比率,观测法检测精子活力...     

肝素浓度对辽宁绒山羊精子体外获能的影响

在TALP液中添加不同浓度(25、50、100μg/mL)的肝素对辽宁绒山羊精子进行获能处理,在显微镜下检测处理1、2、3、4、5h后的精子活力,用考马斯亮蓝染色法检测获能处理0.5、1、2、4h后的精子获能状况,探讨肝素浓度对绒山羊精子活力、存活时间、获能率的影响。结果发现,在38.5℃、5%CO2、饱和湿度条件下,精子活力随肝素浓度升高而下降,3 h以后25μg/mL肝素组精子活力显著高于其它肝素组(P<0.05)。添加肝素组获能率显著高于对照组(P<0.05),各肝素组精子获能率差异不显著(P>0.05)。对照组精子存活时间最长,25μg/mL肝素组精子存活时间为10.12 h,显著高于其它两组(P<0.05)。表明25μg/mL肝素处理辽宁绒山羊精子体外获能较为适宜。     

影响哺乳动物精子体外获能的因素

精子的体外获能是哺乳动物体外受精技术中的关键环节之一。笔者阐述了温度、培养液的pH值、渗透压、动物的种类及培养液的组成对精子体外获能的影响。     

不同获能条件对猪精子体外获能和体外受精的影响

探讨猪精子在mTBM和TALP中分别获能2、3、4、5h和6h对体外获能的影响,并研究最适获能时间的精子体外受精的效果。结果表明:随着获能时间的延长,猪精子顶体反应率逐渐升高、质膜完整性逐渐下降,获能6h时的顶体反应率显著高于其他时间组,分别为52.5%和50.8%(P<0.05);质膜完整性显著低于其他时间组,分别为30.5%和31.4%(P<0.05);可获能4h的超激活运动率显著高于其他时间组,分别为56.6%和54.5%。将鲜精与冻融的精子获能4h后与成熟的猪卵母细胞进行体外受精,mTBM处理组的卵裂率显著高于TALP,分别为42.7%与40.2%和35.9%与33.4%,但鲜精与冷冻精液组间差异不显著。     

咖啡因和肝素、钙离子载体对家畜冷冻精子体外获能的协同作用

本文报道了用咖啡因与肝素、钙离子载体(I-A)协同处理诱导马、驴、猪冷冻精子体外获能的研究结果.咖啡因与肝素、I-A均有协同作用.在肝素或I-A处理中添加咖啡因,不仅能提高穿透率,而且能促进卵内雄原核的形成和发育.精子先经洗涤,再用咖啡因与肝素或I-A协同处理,可得到良好的获能效果.     

牛精子体外获能的研究进展

文章从精子体外获能的分子机制和体外获能的影响因素等两个方面对牛精子体外获能的发展现状作了比较全面的概括.同时指出了各种处理精子方法的优缺点.并指出了牛精子体外获能的研究价值和意义.     

哺乳动物精子获能机理及体外研究

精子获能是哺乳动物精卵融合之前必须经历的一个阶段。自发现精子获能现象以来,对精子获能机制的研究已取得一些进展,但仍有不少问题需要进一步研究。精子获能为体外受精研究获得突破性进展,为人类直接观察受精过程和研究受精机理奠定了基础。文章主要对精子获能的变化、机制及体外研究进行了综述。     

精子获能的分子机制及研究进展

哺乳动物的精子在刚射入雌性生殖道时,或从附睾取出后,并不具备受精能力,必须在雌性生殖道内经过一段时间,发生生理及形态学的变化才能获得受精能力,这一过程被称为精子获能[1]。精子获能是精     

牛精子体外获能前后超微结构的研究

应用透射电镜技术,对牛精子体外获能前后超微结构观察的结果表明,牛精子的超微结构相似于其他哺乳动物,但顶体较大;获能后精子发生了顶体反应.在顶体反应中,囊泡化有3种形式:(1)顶体外膜相互融合,形成囊泡;(2)顶体外膜内陷形成囊泡化;(3)顶体外膜和质膜融合形成囊泡.此外,对精子的结构特点和囊泡形成过程进行了讨论.     

Lipidic microdomain reorganization during the in vitro capacitation of boar spermatozoa

Veterinary Research Communications -     

Effects of epigallocatechin gallate on lipid metabolism and its underlying molecular mechanism in broiler chickens

The objective of this study was to investigate the effects of epigallocatechin gallate (EGCG) on fat metabolism and to establish the molecular mechanism of these effects in broilers. Seventy‐two 28‐day‐old male Ross 308 broiler chickens were divided into three groups with different levels of EGCG supplementation for 4 weeks: normal control (NC) group, L‐EGCG (a low‐level supplement of EGCG, 40 mg/kg body weight daily) and H‐EGCG (a high‐level supplement of EGCG, 80 mg/kg body weight daily). After 4 weeks of oral administration, EGCG significantly reduced the level of abdominal fat deposition in broilers. The serum triglycerides and low‐density lipoprotein cholesterol of chickens in H‐EGCG group were also significantly decreased compared with the NC group, and the high‐density lipoprotein cholesterol was notably increased at the same time. Moreover, the vital role of the liver and abdominal adipose tissue in lipid metabolism of poultry animals was examined through gene expression and enzyme activities related to fat anabolism and catabolism in these organs. Our data show that EGCG supplementation for 2 weeks significantly downregulated the expression of fatty acid synthesis and fat deposition‐related genes, and upregulated the expression of genes involved in fatty acid β‐oxidation and lipolysis genes. Simultaneously, the activities of hepatic fatty acid synthesis enzymes (fatty acid synthase and acetyl CoA carboxylase) were significantly decreased, and the activity of carnitine palmitoyl transferase‐1 was notably elevated. The results suggest that EGCG could alleviate fat deposition in broilers through inhibiting fat anabolism and stimulating lipid catabolism in broilers.     

The detection of in vitro capacitation of bull sperm by heparin treatment

The capacitating effect of heparin upon spermatozoa from original and deep-frozen semen was characterised, using new methods for detection of inducible acrosomal reaction and heparin-mediated sperm aggregation, and was compared with frequently used capacitation by media of high ion strength. Heparin treatment was undertaken also by means of two culture media, "defined medium" (DM) and TCM 199, with 10% fetal calf serum. Higher motility was maintained by means of 10 I.U. of heparin/ml (= 77 micrograms/ml) which also proved helpful in achieving higher capability of inducible acrosomal reaction, as compared to pretreatment, using media of high ion strength. This applied to both fresh and deep-frozen sperm. The highest level of inducible acrosomal reaction was achieved after 2 hours of heparin action on fresh sperm and 30 minutes of action on deep-frozen sperm. That highest value was at its maximum, when TCM with 10% fetal calf serum had been used. This was the medium, after all, in which photometrically recorded aggregation of motile spermatozoa was at its fastest rate, reaching its maximum after about 60 minutes. The photometrically recorded activated motility of spermatozoa occurred more frequently in TCM, as compared to DM. Preparation of bull sperm in TCM 199 with fetal calf serum and heparin may be recommended as an effective and time-saving method for in vitro capacitation.     

酪氨酸磷酸化蛋白在体外获能猪精子上的分布

为研究猪精子获能过程中蛋白酪氨酸磷酸化的变化规律,将猪精子悬浮于改良的Tris缓冲液(mTBM)获能培养基中,在5%CO2孵箱37℃培养,以考马斯亮蓝染液染色为指标评价精子获能状态,用免疫荧光技术检测酪氨酸磷酸化的蛋白在精子上的分布。结果显示,随着获能的进行,发生蛋白酪氨酸磷酸化的精子占总精子的百分比增加,由未获能前35%增至获能1.5 h时的88%,酪氨酸磷酸化的蛋白分布变广,由精子头部扩增至精子头部、鞭毛主段和中段。     

铬对家禽生长性能的影响及其分子机理研究

铬是动物体内的必需微量元素,是葡萄糖耐量因子（GTF）的重要组成部分。近年来,铬对肉鸡生长性能的影响及其分子机理方面的研究已有较大的进展,本文主要就铬的生物学功能、作用机理、在家禽上的应用及影响铬作用效果的因素等方面作一综述。     

CLC对冻融牛精子体外获能及抗氧化、抗凋亡能力的影响

本研究目的是评价CLC对牛冻融精子获能、抗氧化及抗凋亡能力的影响。试验分对照组和CLC处理组(0.5、1.0、1.5及2.0 mg/mL),检测冻融牛精子体外获能后的酪氨酸磷酸化水平以及冻融牛精子抗氧化基因和细胞凋亡基因的表达。结果:1)在0.5 mg/mL CLC处理组冷冻效果最好,与对照组和1.0 mg/mL CLC处理组相比无显著差异;2)冻融牛精子获能处理后,在1.0 mg/mL CLC处理组精子蛋白酪氨酸磷酸化水平最高,与对照组相比无显著差异;3)在0.5 mg/mL CLC处理组冻融牛精子抗氧化基因CAT、GPX和SOD的表达量与对照组相比显著升高(P<0.05);4)在0.5和1.0 mg/mL CLC处理组凋亡基因Caspase-3、Caspase-8和BAX的表达量与对照组相比显著降低(P<0.05)。结论:添加CLC可以改进冻融牛精子获能和抗氧化、抗凋亡能力。