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http://dx.doi.org/10.4062/biomolther.2011.19.4.419

Inhibition of Nitric Oxide Production by Ethyl Digallates Isolated from Galla Rhois in RAW 264.7 Macrophages  

Park, Pil-Hoon (College of Pharmacy, Yeungnam University)
Hur, Jin (Institute of Pharmaceutical Research and Development, Department of Pharmacy, Wonkwang University)
Lee, Dong-Sung (Standardized Material Bank for New Botanical Drugs, College of Pharmacy, Wonkwang University)
Kim, Youn-Chul (Standardized Material Bank for New Botanical Drugs, College of Pharmacy, Wonkwang University)
Jeong, Gil-Saeng (College of Pharmacy, Keimyung University)
Sohn, Dong-Hwan (Institute of Pharmaceutical Research and Development, Department of Pharmacy, Wonkwang University)
Publication Information
Biomolecules & Therapeutics / v.19, no.4, 2011 , pp. 419-424 More about this Journal
Abstract
Galla Rhois and its components are known to possess anti-infl ammatory properties. In the present study, we prepared equilibrium mixture of ethyl m-digallate and ethyl p-digallate isomers (EDG) from Galla Rhois and examined its effect on nitric oxide (NO) production in murine macrophage cell line. Treatment of RAW264.7 macrophages with EDG signifi cantly inhibited NO production and inducible nitric oxide synthase (iNOS) expression stimulated by LPS, as assessed by Western blot and quantitative RT-PCR analyses. We also demonstrated that EDG treatment led to an increase in heme oxygenase-1 (HO-1) mRNA and protein expression. EDG treatment also enhanced expression level of nuclear factor-erythroid 2-related factor 2 (Nrf2) in nucleus, which is critical for transcriptional induction of HO-1. Treatment with SnPP (tin protoporphyrin IX), a selective HO-1 inhibitor, reversed EDG-mediated inhibition of nitrite production, suggesting that HO-1 plays an important role in the suppression of NO production by EDG. Taken together, these results indicate that EDG isolated from Galla Rhois suppresses LPS-stimulated NO production in RAW 264.7 macrophages via HO-1 induction.
Keywords
Ethyl digallate; Inducible nitric oxide synthase (iNOS); Nitric oxide; Nuclear factor-erythroid 2-related factor 2 (Nrf2); Heme oxygenase-1;
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