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Anti-inflammatory and antioxidant activities of constituents isolated from Pueraria lobata roots

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Abstract

In order to evaluate the anti-inflammatory and antioxidant activities of Pueraria lobata roots and its active components, in vitro inhibitory activities against lipopolysaccharide (LPS)-induced nitric oxide (NO) production, inducible nitric oxide synthase (iNOS), cyclooxygenase-2 (COX-2) protein expression, and tert-butylhydroperoxide (t-BHP)-induced reactive oxygen species (ROS) generation in RAW 264.7 cells, as well as in vitro scavenging activities against 1,1-diphenyl-2-picrylhydrazyl (DPPH), peroxynitrite (ONOO), nitric oxide (NO·), superoxide anion (·O2 ) and total ROS, and inhibitory activities against ONOO-mediated tyrosine nitration, were determined. Repeated column chromatography was performed to isolate four known compounds from the anti-inflammatory and antioxidant EtOAc fraction: daidzein; genistein; puerarin; (+)-puerarol B-2-O-glucopyranoside; four known compounds from the anti-inflammatory n-hexane fraction: lupenone; lupeol; puerarol; coumestrol; seven known compounds from the antioxidant n-BuOH fraction: allantoin; 3′-hydroxypuerarin; daidzein 8-C-apiosyl-(1→6)-glucoside; puerarin; genistin; 3′-methoxypuerarin; daidzin. Among these compounds, lupenone and lupeol reduced NO production, as well as iNOS and COX-2 protein levels in LPS-stimulated RAW 264.7 cells. Furthermore, lupeol showed significant inhibitory activity against intracellular ROS generation by t-BHP. Meanwhile, 3′-hydroxypuerarin showed marked ONOO, NO·, total ROS scavenging activities, and weak ·O2 scavenging activity, while 3′-methoxypuerarin showed ONOO scavenging activity and weak NO· and O2 scavenging activities, suggesting that existence of the 3′-hydroxyl group in puerarin plays an important role in the scavenging of ONOO, NO·, and total ROS, as well as inhibiting the ONOO-mediated tyrosine nitration mechanism. These results indicate that P. lobata roots and its constituents may be a useful therapeutic and preventive approach to various inflammatory diseases and oxidative stress-related disease.

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Jin, S.E., Son, Y.K., Min, BS. et al. Anti-inflammatory and antioxidant activities of constituents isolated from Pueraria lobata roots. Arch. Pharm. Res. 35, 823–837 (2012). https://doi.org/10.1007/s12272-012-0508-x

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