Effect of rNA interference on Oatp3a1 gene expression on biological characteristics and immune factors of ovarian granulosa cells in rats with PCOS

Polycystic ovary syndrome (PCOS) is a common endocrinel metabolic disease, and its pathogenesis has not yet been thoroughly studied. The purpose of this experiment was to investigate the effect of RNA interference on Oatp3a1 gene expression on the biological viability and immune factors of ovarian granulosa cells in rats with PCOS. First, rats were intragastrically administered 1 mg/kg letrozole to successfully construct PCOS model. Western blot, qRT-PCR, CCK8 and flow cytometry were used to detect the gene expression, immune factor protein expression, cell proliferation and apoptosis in ovarian granulosa cells transfected with siRNA Oatp3a1 in rats with PCOS, respectively. The results showed that follicle stimulating hormone receptor (FSHR) was located on the cell membrane of rat ovarian granulosa cells, and letrozole successfully induced PCOS rat model. In PCOS rat ovarian granulosa cells, the mRNA expression level of Oapta1 was higher than that in normal rat ovarian granulosa cells. At the same time, compared with the sham group, the protein expression of NF-kappa B, TGF-beta 1 and VEGF in si-Oatp3a1 group was significantly down-regulated (P < 0.05), and the cell proliferation rate was significantly decreased in si-Oatp3a1 group (P < 0.05) in comparison with the sham group. The apoptotic rate was increased obviously (P < 0.05), which was about 2.5 times that of the sham group. This indicates that in the ovarian granulosa cells of rats with PCOS, the interference of Oatp3a1 gene expression can significantly inhibit cell proliferation and promote apoptosis, while inhibiting the expression of immune factors TGF-beta 1 and VEGF can reduce the expression of NF-kappa B protein, thereby suppressing the activation of the NF-kappa B signaling pathway.