表兒茶素對小鼠卵母細胞成熟質(zhì)量的影響
[Abstract]:In this study, the effects of epicatechin (EC) on in vitro maturation (Matured in vitro, IVM) oocytes and maturation quality of matured oocytes in vivo after Repeated Superovulation were studied by investigating the changes of mitochondrial DNA (mtDNA) copy number and ovarian antioxidant capacity in mice. The relationship between mitochondrial DNA and oocyte development potential and the mechanism of EC affecting oocyte maturation were further elucidated. Firstly, the effects of epicatechin on mtDNA copy number and developmental potential of mouse oocytes matured in vitro were investigated. After 16 hours of maturation in vitro, the mtDNA copy number of oocytes treated with EC (0 micromol/L, 5 micromol/L, 10 micromol/L, 15 micromol/L and 20 micromol/L) increased significantly. The mtDNA copy number of oocytes treated with EC was significantly higher in 10 micromol/L group and 15 micromol/L group than that of blank control group (618 223 + 220, respectively). 584,777851 (+ 120487) and 304380 (+ 60963, P 0.05) in the control group, but the mtDNA copy number in the 10 micromol / L group was closer to that in the natural ovulation cycle (618223 (+ 220584) vs 587688 (+ 204035, P 0.05). The results of in vitro maturation culture and parthenogenetic activation showed that the first polar body excretion rate of oocytes in the 10 micromol / L EC group was higher than that in the control group. There was no significant difference between the two groups (P 0.05), but the blastocyst development rate of parthenogenetically activated oocytes was significantly increased (55.71% + 2.84% vs 48.04% + 3.54%, P 0.05). Secondly, the method of treating mice with epicatechin was explored. There was no significant difference in the number of mtDNA copies (P 0.05), but the number of mtDNA copies increased significantly (P 0.05) compared with the control group (P 0.05); the expression of PGC-1a and Tfam genes in ovarian tissue of EC group were up-regulated compared with the control group (P 0.05). There was no significant difference in the number of mtDNA copies (P 0.05) between EC 2D injection group (489723s 148982) and EC 7d injection group (495758 (+203486)) and control group (285786 (+99988, P 0.05); there was no significant difference in the number of eggs (22.80 (+5.84 vs 21.35 vs 5.12, P 0.05) between EC 2D injection group and EC 7d injection group (495758 (+203486)). The results showed that the number of 2-cell embryos obtained in the control group decreased significantly with the increase of the number of superovulation, while the number of 2-cell embryos obtained in the EC treatment group did not change significantly, and there was no significant difference between the two groups (20.25 (+ 1.06 vs 19.25 (+ 1.95 vs 20.33 (+ 1.61 vs 21.00)) and that obtained in the control group at the first superovulation. After in vitro culture, the rate of blastocyst development to blastocyst and the rate of hatching blastocyst decreased gradually with the increase of the number of superovulation. The rate of hatching blastocyst in the control group decreased significantly (62.65 + 0.21 for one time, 53.52 + 3.13 for three times, 42.81 + 4.83 for five times, P 0.05 for five times), but the rate of hatching blastocyst in the EC treatment group decreased significantly (62.65 + 0.21 for one time, 53.52 + 3.13 for three times, 42.81 + 4.83 for five times When the number of superovulation increased to 5 times, the apoptosis rate of blastocysts in EC group and control group increased significantly (P 0.05). The apoptosis rate of blastocysts in control group was significantly higher than that in EC group (3.74 + 0.86 vs 3.10 + 0.74, P 0.05). It was significantly higher than that of the control group (489723 + 148982 vs 298333 + 139487, P 0.05). However, after three and five successive superovulation, the number of mtDNA copies in the EC group and the control group increased significantly, and there was no significant difference among the groups (769066, 389862 vs 811676, 473759 vs 743958, 224432 vs 771691, 341214, P 0.05). The expression of four antioxidant enzymes GPX1, PRDX3, SOD and GLS2 in ovarian tissues of mice in group A was significantly up-regulated, and the content of GSH in ovary was significantly increased (46.68 s 2.67 vs 37.74 s 3.80, P 0.05). Both intragastric administration and injection of pure EC could increase the mtDNA copy number of mouse oocytes; (3) EC at a certain dose (10 mg/kg body weight) could increase the mtDNA copy number of mouse oocytes during superovulation, but did not affect the number of oocytes harvested; (4) with the increase of the number of successive superovulation, the number of embryos obtained decreased and the quality decreased; However, injection of EC during the superovulation can significantly improve the above abnormalities.
【學(xué)位授予單位】:廣西大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2015
【分類號】:S814
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