Aim of the study: The stem bark of Suregada multiflora and the isolated compounds were carried out to investigate for anti-inflammatory activity. Materials and methods: The stem bark of Suregada multiflora and its isolated compounds were tested for their anti-inflammatory effects against lipopolysaccharide (LPS)-induced nitric oxide (NO) and prostraglandin E2(PGE2) releases in RAW264.7 cells as well as the anti-inflammatory mechanism on mRNA expression of the active compound (5, helioscopinolide A). Results: The extract of Suregada multiflora possessed potent NO inhibitory effect with an IC50value of 8.6 μg/ml. Among the isolated compounds, helioscopinolide A (5) exhibited the highest activity against NO release with an IC50value of 9.1 μM, followed by helioscopinolide C (6) and suremulol D (2) with IC50values of 24.5 and 29.3 μM, respectively. The IC50value of 5 against PGE2production was found to be 46.3 μM. The mechanism in transcriptional level of compound 5 was found to inhibit iNOS and COX-2 mRNA expressions in dose-dependent manners. Conclusions: The present study may support the traditional use of Suregada multiflora stem bark for treatment of inflammatory-related diseases. © 2010 Elsevier Ireland Ltd. All rights reserved.
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