Circ_0000491 targets miRNA-101b. (A) The miR-101b mRNA expression levels in MES13 cells transfected with miR-101b mimics or miR-101b inhibitor was confirmed using RT-qPCR. (B) Circ_0000491 expression was examined in the transfected MES13 cells. (C) Diagram of the miR-101b putative binding sites in circ_0000491. (D) miR-101b expression in db/db mice and high glucose treated MES13 cells was measured using RT-qPCR. (E) Luciferase reporter assay showed the binding activity of miR-101b and circRNA_0000491. (F) miR-101b mRNA expression levels in MES13 cells transfected with si_circ_0000491 was measured using RT-qPCR. *P<0.05, **P<0.01 vs. the corresponding control group. circRNA, circular RNA; miR/miRNA, microRNA; RT-qPCR, reverse transcription-quantitative PCR; si, small interfering.