Antiallergic Agents from Natural Sources 9. Inhibition of Nitric Oxide Production by Novel Chalcone Derivatives from Mallotus philippinensis (Euphorbiaceae)

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Three novel chalcone derivatives, mallotophilippens C (1), D (2) and E (3) were isolated from the fruits of Mallotus philippinensis MUELL. ARG. These compounds were identified, using chemical and spectral data, as 1[6-(3, 7-dimethyl-octa-2, 6-dienyl)-5, 7-dihydroxy-2, 2-dimethyl-2H-chromen-8-yl]-3-(4-hydroxy-phenyl)-propenone, 3-(3, 4-dihydroxy-phenyl)-1-[6-(3, 7-dimethyl-octa-2, 6-dienyl)-5, 7-dihydroxy-2, 2-dimethyl-2H-chromen-8-yl]-propenone and l-[5, 7-dihydroxy-2-methyl-6-(3-methyl-but-2-enyl)-2-(4-methyl-pent-3-enyl)-2H-chromen-8-yl]-3-(3, 4-dihydroxy-phenyl)-propenone, respectively. They inhibited nitric oxide (NO) production and inducible NO synthase (iNOS) gene expression by a murine macrophage-like cell line (RAW 264.7), which was activated by lipopolysaccharide (LPS) and recombinant mouse interferon-γ (IFN-γ). Furthermore, they downregulated cyclooxygenase-2 (COX-2) gene, interleukin-6 (IL-6) gene and interleukin-1β (IL-1β) gene expression. These results suggest that they have anti-inflammatory and immunoregulatory effects.
公益社団法人日本薬学会の論文
2004-11-01