title: Phenolic glycosides from Lindera obtusiloba and their anti-allergic inflammatory activities.
abstract: Eight phenolic glycosides, tachioside (1), isotachioside (2), koaburaside (3), 2,6-dimethoxy-4-hydroxyphenyl-1-O-beta-D-glucopyranoside (4), 4,6-dihydroxy-2-methoxyphenyl-1-O-beta-D-glucopyranoside (5), a mixture of erigeside C (6a) and salidroside (6b), and 6-hydroxyphenyl)-1-O-beta-D-glucopyranoside (7) were isolated from the stems of Lindera obtusiloba Blume. The structures of the isolates were determined by 1H-, 13C-NMR, COSY, HMQC, and HMBC spectroscopy. To evaluate their anti-allergic inflammatory activities, the inhibitory effects of isolates (1-7) on histamine release and on the gene expressions of tumor necrosis factor (TNF)-a and interleukin (IL)-6 were examined using human mast cells; previous studies have reported that TNF-alpha and IL-6 release from mast cells is positively related to the severity of allergic symptoms. Of the tested compounds, koaburaside (3), 2,6-dimethoxy-4-hydroxyphenyl-1-O-beta-D-glucopyranoside (4), and (6-hydroxyphenyl)-1-O-beta-D-glucopyranoside (7) suppressed histamine release from mast cells as compared with gallic acid (positive control). In particular, 6-hydroxyphenyl)-1-O-beta-D-glucopyranoside (7) attenuated the gene expressions of the proinflammatory cytokines TNF-alpha and IL-6 in human mast cells. Our results support the notion that phenolic glycosides isolated from L. obtusiloba inhibit mast-cell-derived allergic inflammation, histamine, and proinflammatory cytokines.
authors.affiliation: College of Pharmacy, Yeungnam University, Gyungsan, Gyungbuk 712-749, Korea.
authors.forename: Hyun Gyu
authors.initials: HG
authors.lastname: Choi
authors.forename: Hwa Dong
authors.initials: HD
authors.lastname: Lee
authors.forename: Sang Hyun
authors.initials: SH
authors.lastname: Kim
authors.forename: Min Kyun
authors.initials: MK
authors.lastname: Na
authors.forename: Jeong Ah
authors.initials: JA
authors.lastname: Kim
authors.forename: Seung Ho
authors.initials: SH
authors.lastname: Lee
mesh_terms: D018926:Anti-Allergic Agents / Q000494:pharmacology*; D000893:Anti-Inflammatory Agents / Q000494:pharmacology*; D006027:Glycosides / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology*; D006801:Humans; D027443:Lindera / Q000737:chemistry*
chemical_list: D018926:Anti-Allergic Agents; D000893:Anti-Inflammatory Agents; D006027:Glycosides