title: Antiallergic principles from Alpinia galanga: structural requirements of phenylpropanoids for inhibition of degranulation and release of TNF-alpha and IL-4 in RBL-2H3 cells.
abstract: The 80% aqueous acetone extract of the rhizomes of Alpinia galanga was found to inhibit release of beta-hexosaminidase, as a marker of antigen-IgE-mediated degranulation in RBL-2H3 cells. Nine known phenylpropanoids and p-hydroxybenzaldehyde were isolated from the extract. Among them, 1'S-1'-acetoxychavicol acetate and 1'S-1'-acetoxyeugenol acetate exhibited potent inhibitory activity with IC(50) values of 15 and 19 microM. From the effects of various related compounds, both the 1'- and 4-acetoxyl groups of 1'S-1'-acetoxychavicol acetate and 1'S-1'-acetoxyeugenol acetate were essential for their strong activity, and the 2'-3' double bond enhanced the activity. In addition, 1'S-1'-acetoxychavicol acetate and 1'S-1'-acetoxyeugenol acetate inhibited ear passive cutaneous anaphylaxis reactions in mice and the antigen-IgE-mediated TNF-alpha and IL-4 production, both of which participate in the late phase of type I allergic reactions, in RBL-2H3 cells.
authors.affiliation: Kyoto Pharmaceutical University, Misasagi, Yamashina-ku, Kyoto 607-8412, Japan.
authors.forename: Hisashi
authors.initials: H
authors.lastname: Matsuda
authors.forename: Toshio
authors.initials: T
authors.lastname: Morikawa
authors.forename: Hiromi
authors.initials: H
authors.lastname: Managi
authors.forename: Masayuki
authors.initials: M
authors.lastname: Yoshikawa
mesh_terms: D032429:Alpinia; D000818:Animals; D018926:Anti-Allergic Agents / Q000737:chemistry / Q000494:pharmacology*; D015550:Cell Degranulation / Q000187:drug effects* / Q000276:immunology*; D045744:Cell Line, Tumor; D015847:Interleukin-4 / Q000037:antagonists & inhibitors* / Q000096:biosynthesis / Q000378:metabolism; D008297:Male; D008407:Mast Cells / Q000187:drug effects / Q000378:metabolism; D051379:Mice; D010323:Passive Cutaneous Anaphylaxis; D010666:Phenylpropionates / Q000737:chemistry / Q000494:pharmacology; D010936:Plant Extracts / Q000737:chemistry / Q000494:pharmacology; D051381:Rats; D027343:Rhizome; D013329:Structure-Activity Relationship; D014409:Tumor Necrosis Factor-alpha / Q000037:antagonists & inhibitors* / Q000096:biosynthesis / Q000378:metabolism
chemical_list: D018926:Anti-Allergic Agents; D010666:Phenylpropionates; D010936:Plant Extracts; D014409:Tumor Necrosis Factor-alpha; D015847:Interleukin-4