Effects of Low Oxygen Tension for in vitro Oocyte Maturation and Early Embryo Development through Hypoxia-inducible Factor (HIF)

Oocytes and early embryo in vitro culture (IVC) was a key technology of mammalian embryo engineering and was the basis of biotechnology such as genetically modified (GM) and cloning research.The factors,which affect the efficiency of in vitro culture for oocytes and early embryo,include the composition,ion concentration and osmotic pressure of the culture medium,and the gas composition and temperature of the culture environment. Recent studies have shown that the oxygen tension in the culture systems can significantly affect the development of embryos,and this effect is mainly regulated by the hypoxia-inducible factor (HIF). This paper reviewed the effects of the oxygen tension on oocyte maturation and early embryo development,and the structure and regulation mechanism of HIF were discussed,in order to provide a theoretical basis for further explore the application of hypoxia method in the in vitro culture of oocytes and early embryo.     

氧分压、培养基及微孔对小鼠胚胎体外发育的影响

通过小鼠(Mus musculus)胚胎体外培养,研究了培养基与不同氧分压环境之间是否存在偏好性;同时利用人体呼出的生理混合气体(肺气)对小鼠胚胎体外培养的可行性进行了探索;还比较了微孔(well of the well,WOW)培养法和成组培养法对胚胎发育的影响.结果表明:①在4%CO2+16%O2+78%N2+2%H2O(肺气)、5%CO2+5%O2+90%N2(5%O2,低氧)和5%CO2+20%O2+75%N2(20%O2,高氧)三种气相条件下,CZB和mKSOM两种培养基之间的胚胎卵裂率及囊胚率均差异不显著(P>0.05),但是,在肺气组中,CZB组的囊胚平均总细胞数明显高于mKSOM组(P<0.05);②低氧条件下,mKSOM组的囊胚率(22.6%)显著高于高氧和肺气条件下mKSOM组的囊胚率(P<0.05);③CZB培养基在低氧条件下获得的囊胚率与高氧或肺气条件下所获囊胚率差异不显著(P>0.05);④WOW培养法的囊胚发育率(74.6±5.1%)和囊胚平均总细胞数(76±2)显著高于成组培养法(分别为38.2±6.6%和58±4)(P<0.05).结果提示:培养基mKSOM和CZB在支持胚胎发育时对氧分压具有偏好性;肺气能有效支持胚胎的正常发育;WOW培养法有利于提高胚胎体外发育能力和囊胚质量.     

氧分压、培养基及生长因子对猪孤雌激活胚胎体外发育的影响

体外培养是猪胚胎体外生产的关键环节。近年来在孤雌激活以及体外受精胚胎的培养方面已经取得了很大的进展,但是,和体内生产的胚胎相比,胚胎早期发育率还很低,体外培养     

浅析增氧技术在水产养殖业的应用（上）

水体溶解氧来源较为单纯：（1）来自空气中氧气，与水接触后通过氧分压的不同，朝低压方向转移；（2）水生自养生物通过光合作用等方式生成氧气；从文献报道数据表明，对传统水产养殖业池塘分析表明70%以上溶解氧来自光合作用生成，     

沙丁胺醇联合中药穴位贴敷治疗慢性阻塞性肺病的疗效观察

目的 探讨沙丁胺醇联合中药穴位贴敷治疗慢性阻塞性肺病（Chronic obstructive pulmonary disease,COPD）的疗效。方法 将120名COPD患者分成实验组和对照组,对照组采用单纯沙丁胺醇治疗,实验组采用沙丁胺醇联合中药穴位敷贴治疗。观察两组临床疗效情况、Borg评分变化情况、肺功能[用力肺活量（FVC）、1s 用力呼气容积（FEVl）、1s用力呼气容积占用力肺活量百分比（FEVl/FVC）、]以及血气指标[动脉血氧分压（PaO²）以及二氧化碳分压（PaCO²）]变化情况。结果 实验组总有效率为91.67%,明显对高于对照组的73.33%,两组差异有统计学意义（P<0.01）;实验组Borg评分指数改善情况明显优于对照组（P<0.01）;治疗后两组患者FVC、FEVl、FEVl/FVC均较治疗前增高（P<0.05或P<0.01）,且实验组高于对照组（P<0.05或P<0.01）;治疗后,两组患者PaO²较治疗前升高、PaCO²较治疗前下降（P<0.05或P<0.01）,且实验组PaO²高于对照组、PaCO²低于对照组,差异均有统计学意义（P<0.01）。结论 沙丁胺醇联合中药穴位贴敷治疗COPD相比单用沙丁胺醇治疗,能显著改善肺功能情况,显著提高疗效,值得临床应用与推广。