畜牧兽医学报 ›› 2015, Vol. 46 ›› Issue (10): 1784-1790.doi: 10.11843/j.issn.0366-6964.2015.10.011

• 遗传繁育 • 上一篇    下一篇

胚胎干细胞显微注射对小鼠和猪胚胎发育影响的研究

董晓1,冯书堂2*,王红军1*   

  1. (1.青岛农业大学生命科学学院,青岛 266109;2.中国农业科学院北京畜牧兽医研究所,北京 100193)
  • 收稿日期:2015-02-11 出版日期:2015-10-23 发布日期:2015-10-23
  • 通讯作者: 王红军,教授,E-mail:hjwang11@hotmail.com;冯书堂,研究员,E-mail:fst508@sina.com
  • 作者简介:董晓(1969-),女,山东人,副教授,博士,主要从事干细胞与干细胞治疗研究,E-mail:1163155358@qq.com
  • 基金资助:

    山东省“泰山学者海外特聘专家”启动经费(6631111314);山东省自然基金2014年面上项目(ZR2014CM011)

Analysis of Factors Influencing Embryonic Development after Mouse or Pig Embryonic Stem Cells or Embryonic Germ(ES/EG) Mircoinjection

DONG Xiao1,FENG Shu-tang2* ,WANG Hong-jun1*   

  1. (1.College of Life Science,Qingdao Agricultural University,Qingdao 266109,China;2.Institute of Animal Science,Chinese Academy of Agricultural Sciences,Beijing 100193, China)
  • Received:2015-02-11 Online:2015-10-23 Published:2015-10-23

摘要:

旨在为小鼠和猪多能性干细胞嵌合体制作提供参考,探讨胚胎干细胞(Embryonic stem cells或Embryonic germ cells,ES/EG)显微注射及受体胚胎发育时期等对胚胎发育的影响。对小鼠ES细胞和猪EG细胞分别进行研究:(1)将小鼠ES细胞分别注入小鼠桑椹胚和囊胚,比较不同发育时期受体胚胎体外培养的发育率和孵化率,以及注射胚胎和未注射胚胎体外培养的发育率和孵化率。结果表明,显微注射后的桑椹胚体外培养发育率和孵化率分别为94.7%和70.2%,囊胚率分别为84.6%和80.8%,注射后桑椹胚体外培养发育率极显著高于囊胚(P<0.01),但注射后囊胚体外培养孵化率极显著高于桑椹胚(P<0.01);未注射胚胎(注射胚胎)的体外培养发育率和孵化率分别为96.6%(89.9%)和67.8%(75.2%),未注射胚胎发育率极显著高于注射胚胎(P<0.01),但注射胚胎孵化率极显著高于未注射胚胎(P<0.01)。(2)将猪EG细胞分别注入猪桑椹胚、早囊、囊胚及孵化囊胚,比较不同发育时期受体胚胎移植后妊娠率以及注射胚胎和未注射胚胎体外培养的孵化率,并对猪EG细胞显微注射针和固定针的规格进行了探讨。结果表明,显微注射的桑椹胚、早囊及囊胚移植后妊娠率为67%,而显微注射的孵化囊胚移植妊娠率为0,桑椹胚、早囊及囊胚移植后受体母猪妊娠率极显著高于孵化囊胚(P<0.01),由桑椹胚、早囊及囊胚注射后移植获得了两头嵌合体仔猪;显微注射和未显微注射的猪胚胎其孵化率分别为47.54%和72.97%,未注射胚胎孵化率极显著高于注射胚胎(P<0.01)。确定猪EG嵌合体制作过程中,注射针外径约为30 μm,内径约为25 μm;固定针外直径约为130~150 μm,内径约为40 μm。嵌合体制作时,胚龄宜早不宜迟,桑椹胚显微注射更易操作,而且导入的时期较早,ES/EG细胞在嵌合体组织中可以有很高的贡献率,故选择桑椹胚进行注射。在本试验条件下,显微注射对小鼠胚胎发育影响不大,对猪胚胎影响较大,说明猪胚胎显微注射条件需要进一步优化。

Abstract:

The goal of this study was to assess how different microinjection conditions influence chimeras production after ES/EG cells injection into embryos in mouse and pig.Mouse ES cells were micrioinjected into embryos at morula or blastocyst stages.Hatching rate and blastocyst rate after cell injections were measured in vitro.Non-injected embryos were used as controls.In mouse,embryos showed significant higher developmental rate when ES cells were injected into morulae compared to those injected into blastocysts(P<0.01).In contrast,cells injected into blastocysts had higher hatchability than those injected into morulae(P<0.01).Compared to non-injected controls,ES cell injected embryos had higher hatchability but lower developmental rate after in vitro culture(P<0.01).We further assessed porcine embryonic development after EG cells microinjection into morulae,early blastocysts,blastocysts,or hatched blastocysts,and we also investigated the optimal injecting/ holding pipette sizes for pig EG cell microinjection.Our data showed that pregnancy rates of EG cells microinjected into morulae,early blastocysts,or blastocysts,were significant higher than those injected into the hatched blastocysts(P<0.01).The hatched rate was significantly lower in microinjected embryos compared to non-injected controls(P<0.01).Two chimeric piglets were obtained after embryo transfer.In addition,we found that the optimal inner and outside diameters for pigs EG microinjection were 25 and 30 μm for the injecting pipette,and 40 μm and 130-150 μm for the holding pipette,respectively.Upon comparison of different conditions,we determined optimal injecting/holding pipette sizes for pig EG cell injection.Furthermore,ES/EG cells microinjection into morulae could achieve higher contribution rate in chimera.Microinjection had lower impact on mouse embryonic development compared to pig,suggesting that pig embryonic microinjection condition has to be further optimized.

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