miR-374 is overexpressed in RGI-MSCs and mediates their increased proliferation and migration abilities. (A) The expression of miRNAs (miR-17-5p, miR-99a, miR-221 and miR-374) in the serum of normal and MNNG-induced rats and in RGN-MSCs and RGI-MSCs; *P<0.05. (B) The expression of miR-374 in RGN-MSCs transfected with control and miR-374 mimics; ***P<0.001. (C) Cell counting assays for RGN-MSCs transfected with control and miR-374 mimics at the indicated time points; ***P<0.001. (D) Transwell migration assays for RGN-MSCs transfected with control and miR-374 mimics. Original magnification of the left panel, ×100; the right panel, ×200; scale bar, 50 µm; ***P<0.001. (E) Expression of miR-374 in RGI-MSCs with control and miR-374 inhibitor; ***P<0.001. (F) Cell counting assays for RGI-MSCs transfected with control and miR-374 inhibitor at the indicated time points; **P<0.01. (G) Transwell migration assays for RGI-MSCs transfected with control and miR-374 inhibitor. Original magnification of the left panel, ×100; the right panel, ×200; scale bar, 50 µm; *P<0.05.