MicroRNA-16 Promotes Ovarian Granulosa Cell Proliferation and Suppresses Apoptosis Through Targeting PDCD4 in Polycystic Ovarian Syndrome.

Several miRNAs have been reported to be involved in the pathogenesis of polycystic ovarian syndrome (PCOS). However, the biological roles of miR-16 and its molecular mechanisms in PCOS development remain to be elucidated. qRT-PCR was performed to detect the expression levels of miR-16 and programmed cell death protein 4 (PDCD4). GCs proliferation, cell cycle distribution and apoptosis were examined by MTT assay and flow cytometry analysis. Luciferase reporter assay and RIP assay were applied to confirm the regulatory relationship between miR-16 and PDCD4. Western blot was applied to measure the protein levels of PDCD4, PCNA and caspase-3. ELISA kits were used to determine the serum levels of steroids. miR-16 expression was down-regulated in ovarian cortex tissues and serums of PCOS patients. PDCD4 expression was up-regulated in ovarian cortex tissues of PCOS patients. miR-16 overexpression facilitated cell proliferation, induced cell cycle progression, and inhibited apoptosis in GCs. Moreover, PDCD4 was a direct target of miR-16. Also, enforced expression of PDCD4 abated the effects of miR-16 on GCs growth and apoptosis. Additionally, testosterone resulted in a decrease of miR-16 expression and an increase of PDCD4 expression, thus blocking cell growth and enhanced apoptosis in GCs. Furthermore, miR-16 overexpression alleviated PCOS in vivo by regulating PDCD4. miR-16 promoted ovarian GCs proliferation and inhibited apoptosis through directly targeting PDCD4 in PCOS, contributing to a better understanding of the molecular mechanism of GCs dysregulation and providing a promising target in PCOS.

Fu X ，He Y ，Wang X ，Peng D ，Chen X ，Li X ，Wan Q ... -  《-》

CiRS-126 inhibits proliferation of ovarian granulosa cells through targeting the miR-21-PDCD4-ROS axis in a polycystic ovarian syndrome model.

Lu J ，Xue Y ，Wang Y ，Ding Y ，Zou Q ，Pan M ，Qiao L ，Zhang C ，Ge Q ，Wang T ，Li H ... -  《-》

Mesenchymal stem cells derived exosomal miR-323-3p promotes proliferation and inhibits apoptosis of cumulus cells in polycystic ovary syndrome (PCOS).

Zhao Y ，Tao M ，Wei M ，Du S ，Wang H ，Wang X ... -  《-》

miR-155 is high-expressed in polycystic ovarian syndrome and promotes cell proliferation and migration through targeting PDCD4 in KGN cells.

Xia H ，Zhao Y 《-》

Overexpression of miR-21 in stem cells improves ovarian structure and function in rats with chemotherapy-induced ovarian damage by targeting PDCD4 and PTEN to inhibit granulosa cell apoptosis.

Fu X ，He Y ，Wang X ，Peng D ，Chen X ，Li X ，Wang Q ... -  《Stem Cell Research & Therapy》