Kisspeptin在牛卵母細(xì)胞體外成熟過程中的表達(dá)和功能研究
[Abstract]:Kisspeptin is a polypeptide encoded by KiSS-1 gene. It is expressed in hypothalamus and plays a central role in the regulation of mammalian reproductive activity. The results showed that Kisspeptin was expressed not only in the hypothalamus but also in the ovary, but the function and mechanism of Kisspeptin were seldom studied. It was found that Kisspeptin was involved in oocyte maturation in pigs and mice, but its effects were different in species. It is unclear whether there is Kisspeptin expression in bovine oocytes and its function and mechanism. The distribution, localization and expression of Kisspeptin and its receptor GPR54 in bovine oocytes during maturation in vitro were studied by immunofluorescence and fluorescence quantitative PCR. The effect of exogenous Kisspeptin on bovine oocyte maturation in vitro and its related mechanism were studied. The results were divided into two parts: 1. Bovine oocytes were collected and stained with immunofluorescence for different culture time (0 ~ 6 ~ 12 ~ 1 ~ 18 ~ 24 h), and then observed under inverted fluorescence microscope. The results showed that: Kisspeptin was expressed in the whole process of oocyte maturation in vitro, and expressed in the same position. However, according to the fluorescence intensity of the cells, there were differences in the expression of Kisspeptin at different time points. The expression of KiSS-1GPR54 gene was detected by fluorescence quantitative PCR. the results showed that the expression of KiSS-1 and GPR54 genes were the highest in 0 h, and fluctuated with the process of culture in vitro, and the curve was similar. According to the concentration of exogenous Kisspeptin, the culture medium was divided into five groups: TCM-199 control group, treated with 1nmol / L 102nmol / L nmol / L Kisspeptin. The oocytes were cultured in vitro with five kinds of culture medium and the maturation rate was calculated. The Kisspeptin concentration of the highest maturation rate group was the optimum concentration of adding Kisspeptin. The results showed that the maturation rate of cells in the 10nmol/L Kisspeptin group was significantly higher than that in the other four groups (P0.01). The optimum concentration of 10nmol/L was determined as the addition of exogenous Kisspeptin. They were divided into 8 groups according to the different treatment methods of culture medium, 1TCM-1992TCM-199 Kisspeptin3TCM-199 FSH4TCM-199 FSH Kisspeptin5TCM-199 Kisspeptin FBS6TCM-199 FBS7TCM-199 Kisspeptin p2348TCM-199 p234FSH.The oocytes were cultured in vitro with 8 kinds of culture medium and the maturation rate was calculated. The results showed that the maturation rate of oocytes in Kisspeptin group and Kisspeptin FSH group was higher than that in FBS group (P0.01), and the maturation rate was lower when FBS and Kisspeptin were added at the same time. Compared with the Kisspeptin group, the maturation rate was significantly lower than that of the Kisspeptin group (P0.05), and the maturation rate of the FSH group was not significantly different from that of the FSH group with the addition of FSH and p234 (P0.01), and the addition of Kisspeptin and p234 was significantly lower than that of the Kisspeptin group (P0.05). Fluorescence quantitative PCR was used to detect the expression of BMP15 and GDF9, the key genes of oocyte development during in vitro maturation (1224 h). The results showed that the expression of BMP15 and GDF9 was low at 1224 h, but the expression of BMP15 and GDF9 in cultured medium supplemented with Kisspeptin increased significantly, indicating that Kisspeptin could promote the expression of key genes in maturation.
【學(xué)位授予單位】:吉林農(nóng)業(yè)大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2015
【分類號】:S823
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