title: Spasmolytic stilbenoids from Maxillaria densa.
abstract: 2,5-dihydroxy-3,4-dimethoxyphenanthrene (1), fimbriol-A (2), nudol (3), gymnopusin (4) and erianthridin (5) isolated from Maxillaria densa provoked a concentration-dependent inhibition of the spontaneous contractions of the rat ileum with potencies comparable to papaverine. In order to establish the mode of action of stilbenoids 1-5, their effect on the contractions induced by different spasmogens (histamine, barium chloride and L-NAME) was investigated. In general, the results suggested that the relaxant activity of the products does not involve a direct nitrergic or antihistaminergic mode of action or an interference with calcium influx into the smooth muscle cells.
authors.affiliation: Facultad de Farmacia, Universidad Autónoma del Estado de Morelos, Avenida Universidad 1001, Colonia Chamilpa, 62210, Cuernavaca, Morelos, México.
authors.forename: S
authors.initials: S
authors.lastname: Estrada
authors.forename: J J
authors.initials: JJ
authors.lastname: López-Guerrero
authors.forename: R
authors.initials: R
authors.lastname: Villalobos-Molina
authors.forename: R
authors.initials: R
authors.lastname: Mata
mesh_terms: D000818:Animals; D004305:Dose-Response Relationship, Drug; D007082:Ileum / Q000187:drug effects; D008297:Male; D009119:Muscle Contraction / Q000187:drug effects; D029595:Orchidaceae; D010276:Parasympatholytics / Q000008:administration & dosage / Q000737:chemistry / Q000494:pharmacology* / Q000627:therapeutic use; D008517:Phytotherapy; D010936:Plant Extracts / Q000008:administration & dosage / Q000737:chemistry / Q000494:pharmacology* / Q000627:therapeutic use; D051381:Rats; D017208:Rats, Wistar; D013267:Stilbenes / Q000008:administration & dosage / Q000737:chemistry / Q000494:pharmacology / Q000627:therapeutic use
chemical_list: D010276:Parasympatholytics; D010936:Plant Extracts; D013267:Stilbenes