微小RNA-132在卵巢顆粒細(xì)胞中的功能研究
[Abstract]:Chapter 1 MicroRNA-132 promotes estrogen synthesis in ovarian granulosa cells by inhibiting Nurrl: To investigate the regulation of follicle stimulating hormone (FSH) pathway on microRNA-132 (microRNA-132) in ovarian granulosa cells and the molecular mechanism of microRNA-132 affecting estrogen synthesis in granulosa cells. Methods: Primary ovaries of 21-day ICR mice were isolated and cultured in vitro. Mimics, Nurrl small interfering RNA, Flag-Nurrl plasmid or corresponding negative control were transfected with mGC for 48 hours. Immunochemiluminescence assay was used to detect the concentration of estradiol (E2) and progesterone in the supernatant of cell culture. Real-time PCR was used to detect Cyp19a1, Cyp11a1 and Nurrl. Western blot was used to detect the effect of microRNAs-132 on the expression of Nurrl protein. Luciferase reporter gene plasmid containing 3'-UTR sequence of Nurrl gene was constructed to verify the inhibitory effect of microRNAs-132 on the transcriptional expression of Nurrl gene. The secretion level of mGC E2 with high expression of miR-132 increased by more than 70% (P 0.01), while progesterone secretion did not change significantly. Real-time PCR results showed that microwave-132 promoted the expression of estrogen synthesis rate-limiting enzyme-aromatase gene Cypl9al (2.8 times, P 0.01). Mi-132 significantly inhibited the activity of luciferase in pmirGLO-luc-Nurrl 3'-UTR-WT plasmid (P 0.01), but had no significant effect on the mutant pmirGLO-luc-Nurrl 3'-UTR-MU plasmid. After transfection of siNurr1 into mGC, the effect of microRNAs-132 on E2 synthesis was significantly weakened. After high expression of Flag-Nurr1 in mGC, exogenous Nurr1 significantly counteracted the effect of microRNAs-132 on E2 synthesis. Nurr1 mRNA 3'-UTR, after transcription, inhibits the expression of Nurr1 protein, indirectly up-regulates Cyp19a1 and promotes E2 synthesis in ovarian granulosa cells. Chapter 2 MicroRNA-132 targeting inhibits Foxal-induced apoptosis of ovarian granulosa cells. Objective: To investigate the effect of microRNA-132 on estrogen receptor (E) by directly targeting the expression of Foxal gene in mouse ovary. Methods: After primary cultured mGC transfected with high expression of exogenous miR-132 mimics, the apoptosis of granulosa cells was detected by flow cytometry Annexin V and Cell Death Detection ELISA respectively. Western blot was used to detect the expression of ERa and ER beta proteins in mGC. Effects. Immunohistochemistry was used to detect Foxal expression and distribution in mouse ovarian follicles and the changes of Foxal expression after PMSG treatment. Luciferase reporter gene assay and Western blot confirmed that Foxal was a direct target gene for microarray-132. Foxal-specific small interfering RNA (siRNA) sequence gene was used to silence endogenous Foxal. Results: The results of flow cytometry, Annexin V and Cell Death Detection ELISA showed that the transfection of Mi-132 mimics promoted the apoptosis of mGC (P 0.05), and showed a dose-dependent relationship. Mi-132 was overexpressed in mGC. Foxal protein was mainly expressed in granulosa cells of all levels of follicles. Immunohistochemical signals of Foxal in granulosa cells of ovarian follicles of 21 days postnatal mice stimulated by PMSG (5 IU / mouse) were significantly weakened. Mi-132 significantly inhibited the activity of pmirGLO-luc-Foxa1 3'-UTR luciferase up to 45% (P Cell immunofluorescence assay showed that exogenous high expression of miR-132 could also promote the dispersion of ERa protein from the nucleus to the cytoplasm of mGC. Conclusion: Mi-132 could inhibit the expression of Foxa1 gene in mGC by direct targeting, down-regulate the level of ERa, and promote the output of ERa nucleus, and induce apoptosis of mGC.
【學(xué)位授予單位】:南京大學(xué)
【學(xué)位級(jí)別】:博士
【學(xué)位授予年份】:2016
【分類號(hào)】:R321
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