Figure 7.

Effect of TGFbeta-1 on the expression of dipeptidyl peptidase-4 (DPP4) in human U87 glioma cells. The levels of DPP4 protein and DPP4 enzymatic activity were determined in U87 cell lysates after cultivating the cells with and without 10 ng⋅mL⁻¹ of human recombinant TGFbeta-1 for 72 h. The results are presented as the mean ± SD from six parallel cell culture experiments for each condition measured in triplicate. The levels of DPP4 protein and DPP4 enzymatic activity in the TGFbeta-1-treated and TGFbeta-1-untreated cells did not significantly differ (p = 0.792 and p = 0.126, respectively; Mann–Whitney rank sum test).