title: Antiulcerogenic activity of fractions and 3,15-dioxo-21alpha-hydroxy friedelane isolated from Maytenus robusta (Celastraceae).
abstract: The hexane, chloroform, ethyl acetate and aqueous-soluble fractions from leaves of Maytenus robusta (Celastraceae) were evaluated for their protective actions against ethanol-induced gastric lesions in rats. The treatment with all fractions (150 mg/kg) and omeprazol (30 mg/kg) significantly reduced the lesion index, the total lesion area, and the percentage of lesion, in comparison with the control group (p<0.05). Since the ethyl acetate-soluble fraction was found to be most active in the pylorus ligated model, this fraction was further investigated and resulted in the isolation of triterpene 3,15-dioxo-21alpha-hydroxy friedelane. The triterpene was evaluated in the HCl/ethanol-induced ulcer model in mice. In this assay, both the groups treated with 3,15-dioxo-21alpha-hydroxy friedelane and omeprazol, at a dose of 30 mg/kg, presented a significant reduction in lesion index, total lesion area, and in the percentage of the lesion, when compared with the control group (p<0.05). The result suggests that the antiulcer effect observed in the extract and fractions may be attributed, at least in part, to this compound. Further experiments are underway to determine which antiulcer mechanisms involved in gastroprotection.
authors.affiliation: Programa de Mestrado em Ciências Farmacêuticas, Núcleo de Investigações Químico-Farmacêuticas (NIQFAR), Universidade do Vale do Itajaí - UNIVALI, Itajaí, Santa Catarina, Brazil sfaloni@bol.com.br
authors.forename: Sérgio Faloni
authors.initials: SF
authors.lastname: de Andrade
authors.forename: Eros
authors.initials: E
authors.lastname: Comunello
authors.forename: Vânia Floriani
authors.initials: VF
authors.lastname: Noldin
authors.forename: Franco Delle
authors.initials: FD
authors.lastname: Monache
authors.forename: Valdir
authors.initials: V
authors.lastname: Cechinel Filho
authors.forename: Rivaldo
authors.initials: R
authors.lastname: Niero
mesh_terms: D000085:Acetates; D000818:Animals; D000897:Anti-Ulcer Agents / Q000302:isolation & purification* / Q000494:pharmacology*; D002725:Chloroform; D000431:Ethanol; D005753:Gastric Mucosa / Q000187:drug effects / Q000378:metabolism; D006586:Hexanes; D007202:Indicators and Reagents; D029755:Maytenus / Q000737:chemistry*; D051379:Mice; D009853:Omeprazole / Q000494:pharmacology; D010936:Plant Extracts / Q000494:pharmacology; D051381:Rats; D012997:Solvents; D013276:Stomach Ulcer / Q000139:chemically induced / Q000473:pathology; D014315:Triterpenes / Q000138:chemical synthesis* / Q000737:chemistry; D014867:Water
chemical_list: C527056:3,15-dioxo-21alpha-hydroxyfriedelane; D000085:Acetates; D000897:Anti-Ulcer Agents; D006586:Hexanes; D007202:Indicators and Reagents; D010936:Plant Extracts; D012997:Solvents; D014315:Triterpenes; D014867:Water; D000431:Ethanol; C007650:ethyl acetate; D002725:Chloroform; D009853:Omeprazole