Abstract
Aims: This study aims to evaluate the bioactivity of dipeptidyl nitrile inhibitors of human cysteine cathepsins that could work as anticancer agents in a drug discovery and development project.
Background: Human lysosomal cysteine proteases promote cancer progression, migration, and metastasis, targeted by inhibitors.
Objective: Here, 19 cysteine protease inhibitors known as dipeptidyl nitriles were tested using MIA PaCa-2 pancreatic cancer cells and Balb/3T3 clone A31 non-tumoral mouse fibroblasts.
Methods: In vitro assays evaluated cell migration, colony formation, inhibition of the enzymatic activity in cell lysates, and combination therapy with gemcitabine.
Results: There were mixed results; the inhibitors reduced the number of colonies but did not affect the total area. Cells migrated despite enzyme inhibition by Neq0709 and Neq0712. As expected, the compounds were non-cytotoxic; they improved the potency of gemcitabine in the combined therapy assay, especially for Neq0707.
Conclusion: In summary, our findings revealed the complexity of dealing with the translation from biochemical to cell-based assays in the hit-to-lead step.
Keywords: Cell-based assays, SAR, cysteine protease inhibition, antineoplastic activity, colony formation assay, scratch healing assay, combination therapy.
Graphical Abstract
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