Kindlin-2通过mTOR和Hippo信号通路调节小鼠子宫内膜发育

目的：探讨Kindlin-2对小鼠子宫发育及雌鼠生育能力的影响及其作用机制。方法：利用Cdh16-Cre工具鼠和Kindlin-2^flox/flox小鼠构建在子宫内膜中特异性敲除Kindlin-2的小鼠模型，观察敲除Kindlin-2对雌鼠子宫内膜发育和生殖力的影响。在子宫内膜癌细胞系HEC-1和Ish中分别进行高表达和敲低Kindlin-2的实验，检测雷帕霉素靶蛋白(mammalian target of rapamycin, mTOR)信号通路的激活变化，并且提取特异性敲除Kindlin-2的雌鼠(实验组，基因型为Cdh16-Cre; Kindlin-2^flox/flox)和未特异性敲除Kindlin-2的雌鼠(对照组，基因型为Kindlin-2^flox/flox)子宫蛋白，每组包含6～8只小鼠，重复3次独立实验，检测mTOR信号通路和Hippo信号通路关键分子的蛋白水平。结果：成功构建了子宫内膜特异性敲除Kindlin-2的小鼠模型，通过鼠尾聚合酶链式反应(polymerase chain reaction, PC...

Kindlin-2 regulates endometrium development via mTOR and Hippo signaling pathways in mice

Objective: To investigate the effects and mechanisms of Kindlin-2 on uterus development and reproductive capacity in female mice. Methods: Cdh16-Cre tool mice and Kindlin-2^flox/flox mice were used to construct the mouse model of uterus specific knockout of Kindlin-2, and the effects of Kindlin-2 deletion on uterine development and reproduction capacity of female mice were observed. High expression and knockdown of Kindlin-2 in endometrial cancer cell lines HEC-1 and Ish were used to detect the regulation of mammalian target of rapamycin (mTOR) signaling pathway. In addition, uterine proteins of the female mice with specific knockout of Kindlin-2 and female mice in the control group were extracted to detect the protein levels of key molecules of mTOR signaling pathway and Hippo signaling pathway. Results: The mouse model of uterine specific knockout of Kindlin-2 was successfully constructed. The knockout efficiency of Kindlin-2 in mouse uterus was identified and verified by mouse tail polymerase chain reaction (PCR), Western blot protein identification, immunohistochemical staining (IHC) and other methods. Compared with the control group, the female mice with uterus specific deletion of Kindlin-2 lost weight, seriously impaired reproductive ability, and the number of newborn mice decreased, but the proportion of the female mice and male mice in the newborn mice did not change. Hematoxylin eosin staining (HE) experiment showed that the endometrium of Kindlin-2 knockout group was incomplete and the thickness of uterine wall became thinner. In terms of mechanism, the deletion of Kindlin-2 in endo-metrial cancer cell lines HEC-1 and Ish could downregulate the protein levels of mTOR, phosphorylated mTOR, adenosine monophosphate-activated protein kinase (AMPK), phosphorylated AMPK and phosphorylated ribosomal protein S6 (S6), and the mTOR signal pathway was inhibited. It was found that the specific deletion of Kindlin-2 could upregulate the protein levels of Mps one binding 1 (MOB1) and phosphorylated Yes-associated protein (YAP) in the uterus of the female mice, and the Hippo signal pathway was activated. Conclusion: Kindlin-2 inhibits the development of uterus by inhibiting mTOR signal pathway and activating Hippo signal pathway, thereby inhibiting the fertility of female mice.