showed a trendP < 0.001
In all the three groups where samples were cultured in medium with different concentrations of TGF-β 1 , the total GAG/DNA value showed a trend of up-regulation by mechanical load, this difference was significant in the groups with 0 ng/ml ( P < 0.001) or 10 ng/ml TGF-β 1 ( P < 0.05).