Figure 4.
CircSH3PXD2A acts as a sponge for miR-375-3p to suppress chemoresistance in SCLC. (A) The transfection efficiency of miR-375-3p mimic (left) or inhibitor (right) was determined by qRT‒PCR. (B) After transfected with miR-375-3p mimic (left) or inhibitor (left), the chemoresistance of SCLC cells to the chemotherapeutic drugs DDP, ADM and VP-16 was detected by chemoresistance assay. (C) The effect of miR-375-3p on the apoptosis of SCLC cells was analyzed by flow cytometry. (D) The proliferation rate of SCLC cells was detected by CCK-8 assay. (E) Transwell assays were applied to analyze the influence of miR-375-3p on the migration and invasion of SCLC cells. Scale bar, 100 μm. (F) Comparison of the miR-375-3p levels in SHP77 cells transfected with vector, circ-oe, and circ-oe+miR-375-3p mimic. (G and H) The cell proliferation ability (G) and chemoresistance (H) of SCLC cells were detected after cotransfection of circSH3PXD2A and miR-375-3p mimic. *p<0.05, **p<0.01, ***p<0.001, ****p<0.0001.