ACTA VETERINARIA ET ZOOTECHNICA SINICA ›› 2018, Vol. 49 ›› Issue (11): 2514-2520.doi: 10.11843/j.issn.0366-6964.2018.11.024

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Study on the Differences of HSP70 Expression in Fresh Sperm and Frozen-thawed Sperm in Yak

TANG Peng1,2, LING Xiao-xiao1, JIA Cong-jun1, LIANG Chun-nian1, WU Xiao-yun1, WANG Hong-bo1, CHU Min1, YAN Ping1*   

  1. 1. Key Laboratory of Yak Breeding Engineering of Gansu Province, Lanzhou Institute of Husbandry and Pharmaceutical Sciences, Chinese Academy of Agricultural Sciences, Lanzhou 730050, China;
    2. College of Animal Science and Technology, Gansu Agricultural University, Lanzhou 730050, China
  • Received:2018-01-25 Online:2018-11-23 Published:2019-01-23

Abstract:

The aims of this study were to investigate changes of sperm quality and heat shock protein(HSP)70 expression before and after freezing yak semen. The semen of 6 healthy Datong yaks with normal reproductive ability was collected and assigned to 2 groups:fresh group and frozen-thawed group. The quality of sperm was evaluated by assessing sperm motility and plasma membrane integrity. The expression of HSP70 in both groups was detected by the real-time quantitative polymerase chain reaction,Western blot and immunofluorescence techniques. The results showed that,compared with fresh sperm,sperm motility and plasma membrane integrity of frozen-thawed sperm were significantly decreased (P<0.01); In addition,the expression of HSP70 was significantly lower at both the transcriptional (P<0.05) and protein (P<0.01) levels. HSP70 protein was distributed over the sperm acrosome,acrosome equatorial segment,post-acrosomal and middle sections of sperm in the fresh group. In contrast,after freezing and thawing,HSP70 protein was mainly located in post-acrosomal and middle sections of sperm,and the average optical density was significantly decreased(P<0.01). In conclusion,yak sperm quality and the expression of HSP70 declined simultaneously after freezing and thawing,suggesting that they may be associated.

Key words: HSP70, yak, sperm motility, plasma membrane integrity, immunofluorescent

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