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Novel Non-carboxylate Benzoylsulfonamide-Based Protein Tyrosine Phosphatase 1B Inhibitors with Non-competitive Actions.
A novel series of benzoylsulfonamide derivatives were synthesized and biologically evaluated. Among them, 4-(biphenyl-4-ylmethylsulfanylmethyl)-N-(hexane-1-sulfonyl)benzamide (compound 18K) was identified as a protein tyrosine phosphatase 1B (PTP1B) inhibitor with potent and selective inhibitory activity against PTP1B (IC50 =0.25 µM). Compound 18K functioned as a non-competitive inhibitor and bound to the allosteric site of PTP1B. It also showed high oral absorption in mice (the maximum drug concentration (Cmax )=45.5 µM at 30 mg/kg), rats (Cmax =53.6 µM at 30 mg/kg), and beagles (Cmax =37.8 µM at 10 mg/kg), and significantly reduced plasma glucose levels at 30 mg/kg/d (per os (p.o.)) for one week with no side effects in db/db mice. In conclusion, the substituted benzoylsulfonamide was shown to be a novel scaffold of a non-competitive and allosteric PTP1B inhibitor, and compound 18K has potential as an efficacious and safe anti-diabetic drug as well as a useful tool for investigations of the physiological and pathophysiological effects of allosteric PTP1B inhibition.
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