Inhibition of protein tyrosine phosphatase 1B (PTP1B) and α-glucosidase by xanthones from Cratoxylum cochinchinense, and their kinetic characterizatio...

Basic Information

ID: ALA4184201

Journal: Bioorg Med Chem

Title: Inhibition of protein tyrosine phosphatase 1B (PTP1B) and α-glucosidase by xanthones from Cratoxylum cochinchinense, and their kinetic characterization.

Authors: Li ZP, Song YH, Uddin Z, Wang Y, Park KH.

Abstract: Cratoxylum cochinchinense displayed significant inhibition against protein tyrosine phosphatase 1B (PTP1B) and α-glucosidase, both of which are key target enzymes to attenuate diabetes and obesity. The compounds responsible for both enzymes inhibition were identified as twelve xanthones (1-12) among which compounds 1 and 2 were found to be new ones. All of them simultaneously inhibited PTP1B with IC50s of (2.4-52.5 µM), and α-glucosidase with IC50 values of (1.7-72.7 µM), respectively. Cratoxanthone A (3) and γ-mangostin (7) were estimated to be most active inhibitors against both PTP1B (IC50 = 2.4 µM for 3, 2.8 µM for 7) and α-glucosidase (IC50 = 4.8 µM for 3, 1.7 µM for 7). In kinetic studies, all isolated xanthones emerged to be mixed inhibitors of α-glucosidase, whereas they behaved as competitive inhibitors of PTP1B. In time dependent experiments, compound 3 showed isomerization inhibitory behavior with following kinetic parameters: Kiapp = 2.4 µM; k5 = 0.05001 µM-1 S-1 and k6 = 0.02076 µM-1 S-1.

CiteXplore: 29306546

DOI: 10.1016/j.bmc.2017.12.043

Patent ID: ┄