



摘要:通過對(duì)不同電激活參數(shù)的摸索,電激活和化學(xué)激活聯(lián)合的研究,以確定適合于豬卵母細(xì)胞孤雌激活的最佳方案。結(jié)果表明,體外成熟豬卵母細(xì)胞在電場(chǎng)時(shí)程60 μs,1次直流脈沖的條件下,電場(chǎng)強(qiáng)度1.6 kV/cm時(shí)其卵裂率(88.68%)和桑葚胚率(81.13%)較其他各組高。在電場(chǎng)強(qiáng)度為1.6 kV/cm,1次直流脈沖的條件下,脈沖時(shí)程20 μs時(shí),卵母細(xì)胞卵裂率僅為75.38%,桑葚胚率為64.62%;40和80 μs時(shí),卵裂率分別是84.62%和77.17%;100 μs時(shí),卵母細(xì)胞的卵裂率和桑葚胚率都明顯下降。在電場(chǎng)強(qiáng)度為1.6 kV/cm,電場(chǎng)時(shí)程為60 μs的條件下,2次電脈沖激活卵母細(xì)胞的卵裂率(87.50%)、桑葚胚率(81.25%)和1次電脈沖的卵裂率(88.68%)、桑葚胚率(80.13%)之間無(wú)顯著性差異(P﹥0.05),但兩者均顯著高于3次電脈沖的卵裂率(72.50%)和桑葚胚率(70.27%)。成熟卵母細(xì)胞經(jīng)電刺激(ES)后,分別用CB(7.5 μg/mL)、CHX(10 μg/mL)、6-DMAP(2 mmol/L)、CB(7.5 μg/mL)+CHX(10 μg/mL)、CB(7.5 μg/mL)+6-DMAP(2 mmol/L)各自處理4 h,ES+CB+CHX和ES+CB+6-DMAP組卵裂率顯著高于其他3組,但其桑葚胚率差異不顯著。結(jié)果顯示,電場(chǎng)強(qiáng)度為1.6 kV/cm,電場(chǎng)時(shí)程60 μs,1次脈沖的電刺激對(duì)體外成熟的豬卵母細(xì)胞(IVM)孤雌激活效果最好;1次或2次電脈沖就足以激活豬卵母細(xì)胞,過高脈沖對(duì)細(xì)胞反而有傷害作用;電激活和化學(xué)激活聯(lián)合應(yīng)用可提高豬卵母細(xì)胞的卵裂率。
關(guān)鍵詞:卵母細(xì)胞;體外培養(yǎng);孤雌激活;豬
中圖分類號(hào):Q132;S828文獻(xiàn)標(biāo)識(shí)碼:A文章編號(hào):0439-8114(2011)21-4431-04
Different Parthenogenetic Activation Method for Porcine Oocytes
LI Li1,ZHENG Xin-min1,HUA Zai-dong2,LIU Xi-mei1,BI Yan-zhen1,XIAO Hong-wei1
(1. Institute of Animal Husbandry and Veterinary, Hubei Academy of Agriculture Sciences/Hubei Key Laboratory of Animal Embryo Engineering and Molecular Breeding, Wuhan 430064, China; 2. College of Animal Science, Guizhou University / Guizhou Key Laboratory of Animal Genetics, Breeding and Reproduction, Guiyang 550025, China)
Abstract: In the present study, the parameters of electrical activation and the combined treatments of electrical activation and chemical activation on parthenogenetic activation for in vitro matured porcine oocytes were investigated to find the best program. The results showed that the rates of cleavage and morula of the oocytes using one DC-pulse of 1.6 kV/cm for 60 μs (88.68% and 81.13%) were significantly higher than that in the other treatment groups. The comparison study of different electrical activation parametes indicated that the rates of cleavage in one, double and three DC-pulse of 1.6 kV/cm for 60 μs were 88.68%, 87.50% and 72.50%, respectively. And the rates of morula were 80.13%, 81.25%, 65.00% respectively. The rates of cleavage and morula of the oocytes using one DC-pulse of 1.6kV/cm for 20 μs were 75.38%, 64.62% respectively, while for 40 and 80 μs, the rates of cleavage were 84.62% and 77.17% respectively. For 100 μs, the rates of cleavage and morula decreased remarkably. It showed that double DC-pulse treatment groups were no significant higher than those of one DC-pulse treatment groups(P>0.05), but both were significant higher than three DC-pulse treatment groups, the morula rate of them were also significant higher than the three DC-pulse treatment groups. After electrical activation the oocytes were treated with CB(7.5 μg/mL), CHX(10 μg/mL), 6-DMAP(2 mmol/L), CB(7.5 μg/mL)+CHX(10 μg/mL) and CB(7.5 μg/mL)+6-DMAP(2 mmol/L) 4 hours respectively. The results showed that the effect of electrical activation with one DC-pulse of 1.6 kV/cm for 60μs was the best. One or double activation was enough to activate the porcine oocytes. Too much electrical activation might hurt the oocytes. The combined application of electrical activation and chemical activation could improve the rate of cleavage of oocytes.
Key words: oocytes; in vitro culture; activation; pigs
在大多哺乳動(dòng)物中,排出的卵母細(xì)胞都停留在MⅡ期直至被精子受精激活或人工誘導(dǎo)激活才完成第二次成熟分裂。精子進(jìn)入MⅡ期,卵母細(xì)胞啟動(dòng)繼續(xù)發(fā)育的過程稱為卵母細(xì)胞激活。它包括一系列級(jí)聯(lián)發(fā)生形態(tài)和生理變化等激活事件。盡管細(xì)胞核移植技術(shù)的開展在牛、羊、小鼠、豬等動(dòng)物上獲得成功,但總效率仍很低,而豬的體細(xì)胞核移植效率更低,出生活仔數(shù)與移植胚的比率僅為1%左右[1-3]。……