Anti-Mullerian hormone(AMH) is an important regulator of primordial follicle assembly that appears to mediate a stromal-epithelial interaction in the developing ovary to inhibit follicle assembly. AMH, also known as Mullerianinhibitory substance, is a member of the transforming growth factor beta-family(TGF-B).It inhibits initial follicular recruitment,and it inhibits the stimulatory of FSH on the growth of preantral and small antral follicles.The level of AMH in serum of patients with PCOS which have insulin resistance were significantly increased, suggesting that PCOS patients with abnormal AMH secretion of granulosa cells may exist, it may though IGF-1 system in local ovary, but the cause is unknown. In the early clinical investigation data shows that in the polycystic ovary syndrome patients with high expression of KLF12 in varian granulosa cells, and in the promoter region of AMH revealed 2 binding sites of KLF12,IGF-1can moderate target gene by KLFs, so that we guess KLF12 up-regulated the expression of AMH in ovarian granulosa cells by IGF-1. The results may reveal the etiology of follicular development disorder from a new perspective.With study of KLF12 regulated molecular signaling pathway of AMH promoter activity, it may explore new therapeutic targets for follicular developmental disorder of PCOS with insulin resistance in future.
抗苗勒氏管激素AMH属于TGF-B超家族成员之一,在卵泡发育的启动和选择性生长中发挥了重要作用,是体内唯一抑制卵泡募集的细胞因子,多囊综合症患者AMH明显增高,且与其胰岛抵抗水平密切相关, 提示其卵巢颗粒细胞可能存在AMH分泌异常,推测其与卵巢局部IGF-1系统异常有关,但其调控机制不明。在前期的临床调查研究数据表明在胰岛抵抗型多囊卵巢综合征患者卵巢颗粒细胞中KLF12高表达,并且在AMH的启动子区域发现了KLF12的2个结合位点,故推测KLF12上调卵巢颗粒细胞中AMH的表达,且发现IGF-1可以通过KLF家族调控靶基因表达,故推测在胰岛抵抗型多囊卵巢综合征中,IGF-1是通过KLF12上调卵巢颗粒细胞中AMH的表达,从而探索KLF12和/或其调节靶基因作为治疗胰岛抵抗性多囊卵巢综合征新靶点的可能,为临床治疗开拓新的思路。
多囊卵巢综合征(polycystic ovary syndrome,PCOS)是一类育龄妇女常见的复杂和多样的内分泌紊乱疾病,与月经异常、流产以及一系列妊娠相关并发症相关,同时也是II型糖尿病和心血管疾病的高风险人群。PCOS 患者的卵巢刺激呈现复杂性、异质性和高反应性,促排卵IVF治疗中不成熟卵子增多,受精率低、胚胎质量差、种植率低,周期取消率增加,自然流产率增加,成为IVF治疗过程中的难点。胰岛素抵抗(IR)和高胰岛素血症(HI)在PCOS发病机制中起关键性作用,卵巢组织中的颗粒细胞在增殖过程中受到胰岛素的调控并将糖代谢过程中产生的能量提供给卵母细胞,胰岛素的信号传导系统的正常运行是卵巢组织发挥正常生理功能的关键,其对生殖内分泌的影响远超过生殖轴所致的功能紊乱。本研究通过研究KLF12调控AMH信号通路的机制及相互作用,我们发现小鼠以及人卵巢颗粒细胞高表达KLF12,同时采用KLF12的腺病毒感染KGN(人卵巢颗粒细胞瘤)细胞,48小时收取KGN细胞的蛋白质,利用Westernbolt检测AMH的表达,随着KLF12梯度的升高,AMH表达存在升高趋势。因此本课题组结合以上结果,首先获得KLF12转录调控卵巢颗粒细胞AMH表达的可靠证据;观察KLF12与AMH的相应变化。我们按申请书内容基本上完成了课题的研究工作。我们发现在胰岛抵抗型多囊卵巢综合征中,KLF12与AMH的相关性,同时发现KLF12可能通过非直接结合的方式上调卵巢颗粒细胞中AMH的表达,推测KLF12和AMH其调节靶基因作为治疗胰岛抵抗性多囊卵巢综合征新靶点的可能性,为临床治疗提供基础研究机制。
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数据更新时间:2023-05-31
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