title: Antiallergic agents from natural sources 9. Inhibition of nitric oxide production by novel chalcone derivatives from Mallotus philippinensis (Euphorbiaceae).
abstract: 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 1-[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-gamma (IFN-gamma). Furthermore, they downregulated cyclooxygenase-2 (COX-2) gene, interleukin-6 (IL-6) gene and interleukin-1beta (IL-1beta) gene expression. These results suggest that they have anti-inflammatory and immunoregulatory effects.
authors.affiliation: College of Pharmacy, Nihon University, 7-7-1 Narashinodai, Funabashi, Chiba 274-8555, Japan.
authors.forename: Akihiro
authors.initials: A
authors.lastname: Daikonya
authors.forename: Shigeki
authors.initials: S
authors.lastname: Katsuki
authors.forename: Susumu
authors.initials: S
authors.lastname: Kitanaka
mesh_terms: D018926:Anti-Allergic Agents / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology*; D047188:Chalcones / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology*; D036461:Mallotus Plant; D009569:Nitric Oxide / Q000037:antagonists & inhibitors* / Q000096:biosynthesis; D010936:Plant Extracts / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology
chemical_list: D018926:Anti-Allergic Agents; D047188:Chalcones; D010936:Plant Extracts; D009569:Nitric Oxide