TGF-β inhibitor reversed the effects of miR-214-5p downregulation on the mRNA expression of ALP, Runx2, OC and COL1. Reverse transcription-quantitative polymerase chain reaction demonstrated that TGF-β inhibitor reversed the anti-miR-214-5p-induced increases in the mRNA expression of (A) ALP, (B) Runx2, (C) OC and (D) COL1 in human bone marrow stem cells. ##P<0.01 vs. negative control group; **P<0.01 vs. anti-miR-214-5p group. TGF-β, transforming growth factor-β; miR, microRNA; ALP, alkaline phosphatase; Runx2, runt-related transcription factor 2; OC, osteocalcin; COL1A1, collagen type IV α1 chain; negative, negative control transfection group; anti-miR-214-5p group, miR-214-5p downregulation group; TGF-β inhibitor group, miR-214-5p downregulation+TGF-β inhibitor group.