Study of anti-inflammatory and antinociceptive properties of new derivatives of condensed 3-aminothieno[2,3-b]pyridines and 1,4-dihydropyridines

Background. α-сyanothioacetamide derivatives are promising targets for the search for effective and safe antinociceptive agents with antipyretic and antiexudative activity.

The aim. To conduct in vivo experimental study of anti-inflammatory and analgesic effects of new thienopyridines and 1,4-dihydropyridines derivatives.

Materials and methods. The synthesized cyanothioacetamide derivatives were subjected to virtual bioscreening using Swiss Target Prediction online service. 140  laboratory rats were randomly distributed into intact and control (dextran edema) groups, reference groups (acetylsalicylic acid and  nimesulide) and ten experimental groups for the investigated derivatives of thieno[2,3-b]pyridine and 1,4-dihydropyridine. The anti-inflammatory activity of the compounds at a dose of 5 mg/kg was evaluated by modeling acute dextran edema of rat paw. Determination of analgesic activity was carried out in the hotplate analgesic assay on 130 rats in comparison with sodium metamizole.

Results. 1,4-dihydropyridines AZ331 and AZ420, as well as thienopyridine derivative AZ023 were determined to have strong anti-inflammatory activity (2.5 times more effective than nimesulide and 2.2 times more effective than acetylsalicylic acid). Compounds AZ023, AZ331 and AZ383 showed pronounced analgesic activity. The time of stay on the heated plate for rats of experimental groups that were fed with AZ331 and AZ383 for prophylactic purpose was respectively 9.56 and 9.93 times more than the same index in the reference group. The animals receiving AZ023 were characterized by an increase in the latent reaction time up to 241.2 seconds, which is 14.53 times higher than that in the rats received sodium metamizole.

Conclusion. New thienopyridine and 1,4-dihydropyridine derivatives with high antiinflammatory and analgesic activity were synthesized and studied; they were recognized as promising targets for further preclinical studies.

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