COX inhibitory profiles of a series of thiadiazole-benzothiazole hybrids

Abstract

In an endeavour to identify small molecule COX-1 inhibitors, a colorimetric assay protocol was applied for the in vitro evaluation of COX-1 and 2 inhibitory potential of a series of thiadiazole-benzothiazole hybrids. The most potent and selective COX-1 inhibitor in this series was found as 2-[(5-amino-1,3,4-thiadiazol-2-yl)thio]-N-(6-chlorobenzothiazol-2-yl)acetamide (7) (51.36 ± 3.32% at 100 µM) compared to SC-560 (83.64 ± 3.76% at 1 µM). Compound 7 exerted weaker inhibitory effect on COX-2 (11.05 ± 1.69% at 100 µM). To explore its binding interactions at the active site of human COX-1 (PDB ID: 6Y3C), molecular docking studies were conducted. Compound 7 could establish hydrogen bonds with proper residues thanks to its amide C=O group. In silico studies were employed to shed light on their pharmacokinetic properties. Taken together, compound 7 can be considered as a potential lead compound for the generation of selective COX-1 inhibitors with enhanced efficacy.