Identification of inhibitory antibodies for rat DPP-IV.
A, inhibition of rat DPP-IV by mAbs against rat DPP-IV: inhibition profiles at varying concentrations of a subset of nine good expressers (Ab1–9) from the 13 identified in the alpha screening assay plus two control mAbs (control antibody for irrelevant nonbinding mAb and Ab10 for binding, noninhibitory antibody). B, mAb IC50 values for Ab1, Ab2, and Ab3 toward recombinant rat DPP-IV enzyme: inhibition of DPP-IV-mediated cleavage of GLP-1 by inhibitory antibodies. IC50 was estimated by nonlinear fitting of the percentage of inhibition to mAb concentration.