Effect of DDP, MTX and RAPA on osteosarcoma cell proliferation. (A) MG63 osteosarcoma cells were infected with miR-126-overexpressing or -silencing lentiviral vectors. The effect of DDP, MTX and RAPA on osteosarcoma cell proliferation was then observed by MTT. (B) U-2 OS osteosarcoma cells were infected with miR-126-overexpressing or -silencing lentiviral vectors. The effect of DDP, MTX and RAPA on bone tumor cell proliferation was then observed by MTT. ##,▲▲P<0.01 vs. control group; *P<0.05 vs. anti-miR-126 group. DDP, cisplatin; MTX, methotrexate; RAPA, rapamycin; pre-miR-126, osteosarcoma cells infected with miR-126-overexpressing lentiviral vectors; anti-miR-126, osteosarcoma cells infected with miR-126-silencing lentiviral vectors; OD, optical density.