Acta Veterinaria et Zootechnica Sinica ›› 2019, Vol. 50 ›› Issue (12): 2440-2448.doi: 10.11843/j.issn.0366-6964.2019.12.008

• ANIMAL BIOTECHNOLOGY AND REPRODUCTION • Previous Articles     Next Articles

Effects of SIRT1 on the in vitro Maturation and Aging of Yak Oocytes

XIONG Xianrong1,2, WANG Yan1,2, LI Jian1,2*, XIONG Yan3, ZI Xiangdong1,2, QIU Xiang3   

  1. 1. College of Life Science and Technology, Southwest Minzu University, Chengdu 610041, China;
    2. Key Laboratory of Qinghai-Tibetan Plateau Animal Genetic Resource Reservation and Utilization of Ministry of Education, Chengdu 610041, China;
    3. Key Laboratory of Animal Science, State Ethnic Affairs Commission, Southwest Minzu University, Chengdu 610041, China
  • Received:2019-06-27 Online:2019-12-23 Published:2019-12-20

Abstract: The purpose of this study was to explore the role of SIRT1 on the in vitro maturation and aging of yak oocytes. The SIRT1 specific agonist (SRT2104, SRT group) and inhibitor (Inauhzin, INZ group) were added to the in vitro maturation medium of yak oocytes, respectively. After 24 h in vitro culture of yak cumulus-oocyte complexes (COCs), the expansion of cumulus cells and the excretion of the first polar body were observed. The ROS level in oocyte was measured by immunofluorescence after 24 and 36 h in vitro culture. The expression levels of SIRT1, FOXO3a, SOD2 and Bax in oocytes were detected by RT-qPCR method. Then, yak oocytes were fertilized after 24 and 36 h in vitro culture, and the cleavage and blastocyst formation rates were observed, respectively. The results showed that, after 24 h culture, the cumulus cells expansion degree in SRT group was significantly higher than those in the control group (P<0.05), while the cumulus cells expansion degree and the first polar body excretion rate in INZ group were significantly lower than those in the control group (P<0.05). With the increasing of culture time, the ROS level in oocyte increased significantly (P<0.05); SRT2104 addition significantly inhibited the ROS accumulation in oocytes (P<0.05), while Inauhzin addition significantly increased the ROS level in oocytes (P<0.05). After 24 h culture, the expressions of SIRT1, FOXO3a and SOD2 in SRT group were significantly higher than those in the control group (P<0.05), but the expression of Bax was significantly lower (P<0.05); the expressions of SIRT1, FOXO3a and SOD2 in INZ group were significantly lower than those in the control group (P<0.05), but the expression of Bax was significantly increased (P<0.05). After 24 h culture, the cleavage rate and blastocyst formation rate of oocytes in SRT group were significantly higher than those in INZ group and control group (P<0.05). While after 36 h culture, the cleavage rate and blastocyst formation rate of oocytes in INZ group were significantly lower than those in other groups (P<0.05). In conclusion, SIRT1 is involved in regulating in vitro maturation of yak oocytes. Adding SIRT1 agonist properly in in vitro culture medium can promote in vitro maturation and alleviate aging of yak oocytes, simultaneously improve the developmental capacity of early embryos.

Key words: SIRT1, oocyte, maturation, aging, yak

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