›› 2016, Vol. 43 ›› Issue (8): 2104-2111.doi: 10.16431/j.cnki.1671-7236.2016.08.024

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Effect of Cryopreservation on the Expression of Tetraspanin CD9 in Sheep Oocytes

Wuliyasu, Wuyahan, SHI Zhen-dan, Ailungaowa, Zhamuga, Wuyunsiqin, Enhemarite, Narenhua   

  1. Key Laboratory of Animal Genetics, Breeding and Reproduction of Inner Mongolia Autonomous Region, College of Animal Science, Inner Mongolia Agricultural University, Hohhot 010018, China
  • Received:2016-01-15 Online:2016-08-20 Published:2016-08-23

Abstract:

The experiment was aimed to explore the expression of CD9 in the follicles at different developmental stages, and investigate the effect of in vitro maturation and cryopreservation on CD9. The expression of CD9 protein in the follicle was detected by immunohistochemistry technique, the expression of CD9 mRNA was detected by Real-time quantitative PCR, CD9 protein was detected by Western blotting. The results showed that the CD9 fluorescence signal was detected by immunohistochemistry technique, and the fluorescence signal gradually increased with the maturation of the follicle, and fluorescence signal was the strongest in mature follicle;Real-time quantitative PCR showed that the expression of CD9 mRNA in fresh MⅡ oocytes was significantly increase (P<0.05), and was the least in frozen GV oocytes;The result of Western blotting indicated that CD9 protein was the most in fresh MⅡ oocytes and the expression of frozen GV oocytes was the least, consistent with the results of Real-time quantitative PCR. Cryopreservation of oocytes was more extensive than embryo cryopreservation. Tetraspanins CD9 played a very important role in sperm egg fusion. The above experimental results showed that the cryopreservation made damage to oocytes, decrease content of tetraspanins CD9 protein, and CD9 injury was one of the important reasons for the decline of fertilization rate.

Key words: CD9; ovary; oocytes; in vitro maturation; immunohistochemistry; Western blotting; Real-time quantitative PCR

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