Hsa_circ_0001740 mediates trophoblast cell function via regulating miR-188-3p/ARRDC3.

Preeclampsia is an obstetric disorder and remains the leading contributor to maternal and fetal morbidity and mortality. This study was designed to explore the role of hsa_circ_0001740 in preeclampsia as well as its underlying mechanism. Real-time quantitative polymerase chain reaction was performed to examine hsa_circ_0001740 and miR-188-3p levels in trophoblast cell line HTR-8/SVneo. The proliferation, migration, invasion, and apoptosis of HTR-8/SVneo cells were detected using cell counting kit-8, colony formation, wound healing, transwell, and terminal-deoxynucleoitidyl transferase mediated nick end labeling assays, respectively. The expression of apoptosis- and Hippo signaling-related proteins were assessed by western blot. Moreover, the binding relationship between hsa_circ_0001740 and miR-188-3p, miR-188-3p and ARRDC3 were verified by luciferase report assay. The results showed that hsa_circ_001740 overexpression inhibited the proliferation, migration, and invasion, and promoted apoptosis of HTR-8/SVneo cells. Hsa_circ_0001740 was verified to bind to miR-188-3p, and ARRDC3 was demonstrated to be a target of miR-188-3p. miR-188-3p overexpression partially counteracted the suppressive effects of hsa_circ_001740 overexpression on the proliferation, migration, and invasion of HTR-8/SVneo cells. What's more, ARRDC3 expression was upregulated by hsa_circ_001740-overexpression but was downregulated by miR-188-3p overexpression. Hsa_circ_001740/miR-188-3p also mediated Hippo signaling. To summarize, hsa_circ_0001740 could maintain trophoblast cell function via downregulating miR-188-3p, providing a potential biomarker for the diagnosis and treatment of preeclampsia.