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Title: Identification of flavonoid C-glycosides as promising antidiabetics targeting protein tyrosine phosphatase 1B
Authors: Rampadarath, Athika 
Balogun, Fatai Oladunni 
Pillay, Charlene 
Sabiu, Saheed 
Keywords: 1116 Medical Physiology
Issue Date: 24-Jun-2022
Publisher: Hindawi Limited
Source: Rampadarath, A. et al. 2022. Identification of flavonoid C-glycosides as promising antidiabetics targeting protein tyrosine phosphatase 1B. Journal of Diabetes Research: 6233217-. doi:10.1155/2022/6233217
Journal: Journal of Diabetes Research; Vol. 2022 
Protein tyrosine phosphatase 1B (PTP1B), a negative regulator of the insulin signaling pathway, has gained attention as a validated druggable target in the management of type 2 diabetes mellitus (T2DM). The lack of clinically approved PTP1B inhibitors has continued to prompt research in plant-derived therapeutics possibly due to their relatively lesser toxicity profiles. Flavonoid C-glycosides are one of the plant-derived metabolites gaining increased relevance as antidiabetic agents, but their possible mechanism of action remains largely unknown. This study investigates the antidiabetic potential of flavonoid C-glycosides against PTP1B in silico and in vitro. Of the seven flavonoid C-glycosides docked against the enzyme, three compounds (apigenin, vitexin, and orientin) had the best affinity for the enzyme with a binding score of -7.3 kcal/mol each, relative to -7.4 kcal/mol for the reference standard, ursolic acid. A further probe (in terms of stability, flexibility, and compactness) of the complexes over a molecular dynamics time study of 100 ns for the three compounds suggested orientin as the most outstanding inhibitor of PTP1B owing to its overall -34.47 kcal/mol binding energy score compared to ursolic acid (-19.24 kcal/mol). This observation was in accordance with the in vitro evaluation result, where orientin had a half maximal inhibitory concentration (IC50) of 0.18 mg/ml relative to 0.13 mg/ml for the reference standard. The kinetics of inhibition of PTP1B by orientin was mixed-type with V max and K m values of 0.004 μM/s and 0.515 μM. Put together, the results suggest orientin as a potential PTP1B inhibitor and could therefore be further explored in the management T2DM as a promising therapeutic agent.
ISSN: 2314-6745
2314-6753 (Online)
DOI: 10.1155/2022/6233217
Appears in Collections:Research Publications (Applied Sciences)

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