Expression of cyclins B1 and D1. TSHZ3 siRNA and miR-125b-1-3p were administered to NP cells alone or in combination, and the expression of cyclins D1 and B1 was measured by western blot analysis. **P<0.01 vs. the control cells. NP, nucleus pulposus; TSHZ3, Teashirt zinc finger homeobox 3; miR, microRNA; siRNA, small interfering RNA.