Expression of HIF-1α and miR-18b in hsa-miR-30c mimic (mimic), hsa-miR-30c inhibitor (inhibitor), negative control transfected (NC) and non-transfected HTR-8/SVneo cells (blank) detected by reverse transcription-quantitative polymerase chain reaction and western blotting. (A) Relative mRNA expression levels of miR-18b in all groups of HTR-8/SVneo cells. (B) Expression levels of HIF-1α protein in all groups of HTR-8/SVneo cells. GAPDH was used as a loading control. (C) Relative expression levels of HIF-1α protein in all groups of HTR-8/SVneo cells. (D) Relative expression levels of HIF-1α mRNA in all groups of HTR-8/SVneo cells. *P<0.05 vs. Blank. #P<0.05 vs. NC. HIF-1α, hypoxia inducible factor-1 α; PE, preeclampsia; miR-18b, microRNA 18b.