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Journal of Pharmacy and Pharmacology 2011-May

Anti-inflammatory effect of Rhus verniviflua Stokes by suppression of iNOS-mediated Akt and ERK pathways: in-vitro and in-vivo studies.

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Chang Hwa Jung
Jeong-Hyun Kim
Ji Hye Kim
Joo Hee Chung
Han-Seok Choi
Jong Bok Seo
Yong-Cheol Shin
Sung-Hoon Kim
Seong-Gyu Ko

Sleutelwoorden

Abstract

OBJECTIVE

Rhus verniciflua Stokes (RVS), which has valuable medicinal properties, has for many years been prescribed for inflammation in east Asian medicine. Recent studies suggest that RVS has potent antioxidative, antitumor and anti-inflammatory properties.

METHODS

In this study, the anti-inflammatory effects of RVS in vitro and in vivo were investigated. The ethanol extract from RVS was partitioned with different solvents in order of increasing polarity.

RESULTS

Among the various extracts, the n-butanol extract displayed the most potent activity against nitric oxide and reactive oxygen species. The n-butanol extract also significantly regulates expression of nitric oxide synthase, which inhibits nitric oxide production at the transcriptional level in activated macrophages. Immunoblot analysis also showed that n-butanol extract suppresses the phosphorylation of extracellular signal-regulated kinase and Akt, suggesting that nitric oxide synthase suppression might be mediated via the extracellular signal-regulated kinase and Akt signaling pathways. This study also investigated whether n-butanol exerts an anti-inflammatory effect in an animal model. n-butanol extract significantly reduces carrageenan-induced mouse paw edema at 5 h.

CONCLUSIONS

These results suggest that RVS could be a promising candidate agent for inflammation prevention and combination therapy with anti-inflammatory drugs.

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