| Assay Method Information | |
| | n Vitro Testing of DPP IV Inhibitory Activity |
| Description: | itagliptin phosphate monohydrate and the different tested compounds were dissolved in dimethyl sulphoxide (DMSO) and diluted with tris buffer (pH 8.0, 50 mM) to achieve the required concentrations. DPP-IV inhibition assay was conducted using a kit purchased from Biovision (Milpitas, Calif., USA). Briefly, DPP-IV enzyme was diluted with tris buffer and pipetted 50 μl into glass mini-cells. Subsequently the 25 μl of tris buffer, sitagliptin phosphate monohydrate or the tested compounds was added and incubated at 37° C. for 20 min protected from light. Finally, a volume of 25 μl of DPP-IV substrate was added into each tube. The fluorescence generated from hydrolysis of the substrate was read at Ex/Em=360/460 nm using Modulus single tube multimode reader (Promega, USA). Baseline fluorescence was recorded before incubation (R1) and 20 min after incubation (R2). Percentage inhibition was calculated according to the following equation:% inhibition=(ΔRFU test/ΔRFU E C)*100where, ΔRFU=R2−R1 and EC is the enzyme control (enzyme solution without inhibitor) which is considered 100% activity.The standard DPP-IV inhibitor drug sitagliptin was employed as positive control. Screening was done of all the synthesized compounds at 100 nM then a dose-response study was conducted of the compounds that showed a promising inhibitory effect on DPP-IV activity (>80% inhibition which was comparable to that of sitalgliptin). Sigmoidal dose-response curves for DPP-IV % inhibition versus log concentrations were plotted using Graphpad prism software, version 5.00 (GraphPad Software, Inc. La Jolla, Calif., USA). |
| Affinity data for this assay | |
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