小鼠精子注入兔卵母细胞受精研究

利用显微操作仪将小鼠精子注入家兔卵母细胞的胞质内和透明带下,对鼠兔异种精卵互作和异种受精胚胎的发育进行了研究,并对注射精子的数量及卵的体外成熟时间等影响鼠兔异种显微受精的因素进行了探讨,结果如下:(1)将小鼠精子分别注入兔卵胞质内和透明带下,均能激活兔卵母细胞,导致精核解聚和原核形成;(2)小鼠精子注入兔卵胞质内和透明带下受精,杂种胚胎体外培养能发育到8-细胞期;(3)鼠兔异种受精4-细胞胚胎染色体标本制备观察结果表明,它们为正常二倍体;(4)鼠兔异种受精4-细胞胚胎的超微结构观察结果表明,它们极近似兔正常4-细胞胚胎的超微结构;(5)将小鼠精子注入兔卵透明带下,注射5—10个精子组卵的受精率(32.4%)和卵裂率(16.2%)均高于注射单个精子组的,但二组间差异不显著(P>0.05);DM 15%NCS液中体外成熟培养11—12h兔卵透明带下注入1—2个小鼠精子后的受精率(42.3%)和卵裂率(30.8%)均高于体外成熟培养24—25h组的,但二组间差异未达到显著水平(P>0.05)。

STUDIES ON MICROINJECTION OF MOUSE SPERMATOZOA INTO RABBIT OOCYTES

The methods of intracytoplasmic sperm injection (ICSI) and subzonal injection (SUZI) were used to study heterologous fertilization and embryonic development between the mouse and the rabbit. Results were as follows: 1. The mouse sperm nuclei decondensed and formed pronuclei following microinjection into cytoplasm and perivitelline space (PVS) of rabbit oocytes; 2. The hybrid embryos developed to the stage of 8-cell when cultured in vitro; 3. The karyotype analysis showed a normal complement of rabbit oocyte and mouse sperm chromosomes in the 4-cell hybrid embryos; 4. The ultrastructure of 4- cell hybrid embryos was similar to that of normal 4-cell rabbit embryos; 5. The fertilization rate (32. 4%) and cleavage rate (22. 2%) when 5-10 mouse spermatozoa were injected were higher than those of injection of a single spermatozoon into PVS of the rabbit oocyte, but the difference was not significant (P>0. 05). The fertilization rate (42. 3%) and cleavage rate (30. 8%) in rabbit oocytes in vitro matured for 11 - 12h were higher than those in the oocytes which were in vitro matured for 24 - 25h following microinjection of 1 - 2 mouse spermatozoa into PVS, but the difference was not significant (P>0. 05).