Fig. 5From: Dipeptidyl peptidase-4 is highly expressed in bronchial epithelial cells of untreated asthma and it increases cell proliferation along with fibronectin production in airway constitutive cellsAssay of the effect of rhDPP4 on the proliferation of BSMCs and HFL-1 cells. a Proliferative effect of rhDPP4 on BSMCs. Significant proliferation was seen with rhDPP4 at 50 and 100 ng/ml. But a proliferative effect was not observed at 500 ng/ml. *P < .005 and **P < .05, compared with no rhDPP4. b In HFL-1, a concentration-dependent proliferative effect was observed at rhDPP4 concentrations of 50 ng/ml and above. *P < .01, compared with no rhDPP4Back to article page