title: [Effect of tremulacin on actions of SRS-A and histamine].
abstract: The effect of tremulacin (TRC) extracted from Mao Bai Yang (Folia Populus tomentosa Carr) on actions of SRS-A and histamine were investigated by using isolated guinea pig ileum and spectrofluorometric assay. TRC was found to inhibit the contraction of isolated guinea pig ileum induced by histamine and SRS-A, in a dose-dependent manner with IC50 of 1.78 x 10(-4) mol.L-1 and 2.51 x 10(-4) mol.L-1, respectively. TRC at the dose of 10(-4) mol.L-1 inhibited SRS-A release from sensitized isolated guinea pig lung. While at the dose of 10(-5) mol.L-1 inhibited histamine release from the peritoneal mast cells in sensitized rats. These results indicate that inhibition of the release of histamine and SRS-A may play an important role in the mechanism of antiinflammatory actions of TRC.
authors.affiliation: Department of Pharmacology, Chinese Academy of Medical Sciences, Beijing.
authors.forename: D X
authors.initials: DX
authors.lastname: Yang
authors.forename: K Q
authors.initials: KQ
authors.lastname: He
authors.forename: G F
authors.initials: GF
authors.lastname: Cheng
mesh_terms: D000818:Animals; D000894:Anti-Inflammatory Agents, Non-Steroidal / Q000494:pharmacology*; D005260:Female; D005960:Glucosides / Q000494:pharmacology*; D006168:Guinea Pigs; D006633:Histamine Antagonists; D006636:Histamine Release / Q000187:drug effects; D007082:Ileum / Q000187:drug effects; D008297:Male; D008407:Mast Cells / Q000378:metabolism; D009119:Muscle Contraction / Q000187:drug effects; D010529:Peritoneal Cavity / Q000166:cytology; D051381:Rats; D017208:Rats, Wistar; D013189:SRS-A / Q000037:antagonists & inhibitors* / Q000096:biosynthesis
chemical_list: D000894:Anti-Inflammatory Agents, Non-Steroidal; D005960:Glucosides; D006633:Histamine Antagonists; D013189:SRS-A; C095421:tremulacin