UAMC00039 dihydrochloride is a potent, reversible, and competitive inhibitor of dipeptidyl peptidase II, with an IC50 of 0.48 nM.

DPP2:0.48 nM.

Stability of UAMC00039 in RPMI medium or assay buffer (50 mM cacodylate buffer pH5.5) is monitored at 37 °C. The inhibitors' capacity (IC50) to inhibit DPPII is measured at different time points (up to 48 h). U937 cells are incubated with various concentrations of UAMC00039 for 15 min at 37 °C in RPMI. Cells are then ished with PBS, lysed and assayed for DPPII activity. Concentration–response and time–response curves are generated from incubations of PBMC with UAMC00039 (0.01 nM–1 μM) in RPMI at 37 °C for 1, 5, 15, 30 and 60 min. Ished cells are lysed overnight at 4 °C using 100 mM HEPES buffer pH 7.4, 10 mM EDTA, 70 μg/mL aprotinin and 1% octylglucoside.

Rat: UAMC00039 is administered orally at 2 mg/kg (～5 μMol/kg in a vehicle of 2% tween 80, 10 mL/kg) on a blind basis in all in vivo assays. For each assay, a reference compound and vehicle control is analyzed concurrently. For the in vivo studies 3 to 5 animals per condition are tested.