Figure 2.
Inhibitory activity of sitagliptin on DPP-IV activity measured in situ on 2-day Caco-2 cells: (a) at 1 µM, sitagliptin inhibited DPP-IV activity in Caco-2 cells by over 50%; (b) sitagliptin inhibited DPP-IV activity in a dose-response manner, exhibiting an IC50 of 0.6 µM. Data are the means ± SD of three experiments performed in triplicate.