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논문 기본 정보

자료유형
학술저널
저자정보
Lim, Hyo-Jin (College of Pharmacy, Sookmyung Women's University) Li, Hua (College of Pharmacy, Sookmyung Women's University) Kim, Jae-Yeon (College of Pharmacy, Sookmyung Women's University) Ryu, Jae-Ha (College of Pharmacy, Sookmyung Women's University)
저널정보
한국응용약물학회 Biomolecules & Therapeutics(구 응용약물학회지) Biomolecules & therapeutics 제19권 제1호
발행연도
2011.1
수록면
27 - 32 (6page)

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초록· 키워드

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The activation of microglia induces the overproduction of inflammatory mediators that are responsible for the neurodegenerative disorders including Alzheimer's disease and Parkinson's disease. The large amounts of prostaglandin $E_2$ ($PGE_2$) produced by inducible cyclooxygenase (COX-2) is one of the main inflammatory mediators that can contribute to neurodegeneration. The inhibition of COX-2 thus may provide therapeutic strategy for the treatment of neurodegenerative diseases. From the activity-guided purification of EtOAc soluble fraction of Siegesbeckia glabrescens, four compounds were isolated as inhibitors of $PGE_2$ production in LPS-activated microglia. Their structures were determined as 3, 4'-dimethylquercetin (1), 3, 7-dimethylquercetin (2), 3-methylquercetin (3) and 3, 7, 4'-trimethylquercetin (4) by the mass and NMR spectral data analysis. The compounds 1-4 showed dose-dependent inhibition of $PGE_2$ production in LPS-activated microglia with their $IC_{50}$ values of 7.1, 4.9, 4.4, $12.4\;{\mu}M$ respectively. They reduced the expression of protein and mRNA of COX-2 through the inhibition of I-${\kappa}B{\alpha}$ degradation and NF-$\kappa}B$ activity that were correlated with the inactivation of p38 and ERK. Therefore the active compounds from Siegesbeckia glabrescens may have therapeutic effects on neuro-inflammatory diseases through the inhibition of overproduction of $PGE_2$ and suppression of COX-2 overexpression.

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