Multiple-targeting compounds might reduce complex polypharmacy of multifactorial diseases, such as diabetes, and contribute to the greater therapeutic success. Targeting reactive oxygen species-producing enzymes, as xanthine oxidase (XO), might suppress progression of diabetes-associated vascular complications. In this study a small series of benzimidazole derivatives (1-9) was evaluated for inhibitory activity against dipeptidyl peptidase-4 (DPP-4) and XO. One 1,3-disubstituted-benzimidazole-2-imine (5) and 1,3-thiazolo[3,2-a]benzimidazolone derivative (8) were shown as effective dual DPP-4 and XO inhibitors, with IC values lower than 200 μM, and predicted binding modes with both target enzymes. Both selected dual inhibitors (compounds 5 and 8) did not show cytotoxicity to a greater extent on Caco-2 cells even at concentration of 250 μM. These structures represent new non-purine scaffolds bearing two therapeutic functionalities, being DPP-4 and XO inhibitors, more favorable in comparison to DPP-4 inhibitors with DPP-4 as a single target due to pleiotropic effects of XO inhibition.
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