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Article Title

Anti-inflammatory principles from Balanophora laxiflora

Abstract

Eighteen known compounds, including lignans, phenylpropanoids, triterpenoids, and phytosterols, were isolated from Balanophora laxiflora (Balanophoraceae). The inhibitory activities of these compounds on the production of nitric oxide (NO), a pro-inflammatory mediator, were evaluated. Compounds isolariciresinol (1), ethyl caffeate (13) and ferulic aldehyde (16) showed potent to mild inhibitory activities on LPS-stimulated NO production in RAW 264.7 macrophages with IC 50 values of 0.81, 7.29, and 98.67 μM, respectively. The results showed that compound 1 had a potent effect on TNF-α production with an IC 50 value of 0.87 μM, but practically no effect on IL-6 synthesis. In addition, an inhibitory effect of compound 1 on nuclear factor-κB (NF-κB) activation was shown by the repression of LPS-stimulated β-lactamase reporter activity. Taken together, these results demonstrated that compound 1 modulates the production of inflammatory mediators through the attenuation of NF-κB transcription signaling.

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