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Pyrazole–chalcone derivatives as selective COX-2 inhibitors: design, virtual screening, and in vitro analysis

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Abstract

In the process of research and development of new drugs, in silico analyzes are widely used. They address the pharmacokinetics of the molecules in study and can predict the binding mode and affinity, using a docking software. This approach can optimize the development of new drugs, reducing costs, time, and resources. In this study, a library of 300 pyrazole–chalcone derivatives were designed, the in silico ADMET (absorption, distribution, metabolism, excretion, and toxicity) properties were evaluated, and a structure-based virtual screening was performed using AutoDock Vina. The docking results exhibited that the derivatives binding mode at the COX-2 active site is similar to celecoxib, the reference drug, and presented similar binding energy. Six compounds were synthetized and tested for in vitro inhibition of the COX-1 and COX-2 isoenzymes and the selectivity index (SI) was calculated. The compound 2a11 showed the best activity for COX-2 (IC50COX-2 = 0.73 μM) whereas the control, celecoxib, resulted IC50COX-2 = 0.88 μM. All the other compounds synthetized presented better potency for COX-2 inhibition than the control. Compound 2a23 exhibited the higher SI, of 280.17 (IC50COX-1 = 210.13 μM/ IC50COX-2 = 0.75 μM), while celecoxib was 246.88 (IC50COX-1 = 217.26 μM/ IC50COX-2 = 0.88 μM). These results corroborate with a possible anti-inflammatory activity and COX-2 selectivity of the new compounds synthetized.

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Acknowledgements

This study was financed in part by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior—Brasil (CAPES)—Finance Code 001, and, research support fund (FAP-UNIVALI).

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Correspondence to Rogério Corrêa.

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Macarini, A.F., Sobrinho, T.U.C., Rizzi, G.W. et al. Pyrazole–chalcone derivatives as selective COX-2 inhibitors: design, virtual screening, and in vitro analysis. Med Chem Res 28, 1235–1245 (2019). https://doi.org/10.1007/s00044-019-02368-8

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  • DOI: https://doi.org/10.1007/s00044-019-02368-8

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