title: In vivo antioxidant and vasodilating activities of Gmelina arborea (Verberaceae) leaves hexane extract.
abstract: The present study investigated the effects of Gmelina arborea hexane leaves extract on markers of oxidative stress and its vasorelaxant effects on isolated rat aorta, in order to postulate the possible mechanisms involved in the antihypertensive properties of the plant. To evaluate the antioxidant effects of the extract, rats were randomly divided into four groups of five rats each. With the exception to the group receiving Tween (2.5%), the other groups were treated either with NaCl (900mg/kg/day) alone, NaCl (900mg/kg/day) combined with vitamin C (5mg/kg/day) or Gmelina arborea extract (150mg/kg/day). At the end of eight weeks of treatment, animals were sacrificed and some organs as well as blood samples were collected for biochemical analysis. The in vitro vasodilating effects of the extract (0.5-1.5mg/ml) were evaluated using intact and denuded rat thoracic aortic rings or aorta pre-incubated in L-NAME (2µM), indomethacin (2µM) or glibenclamide (2µM) and contracted with phenylephrine (1µM). The in vivo effects of G. arborea hexane extract prevented both left ventricular and vascular hypertrophy, it also modulated lipid metabolism. Moreover, the extract prevented lipid peroxidation, increased superoxide dismutase and catalase activity as well as NO level. On isolated rat aortic rings, the extract induced concentration-dependent vasorelaxant effects. Extract-induced vasodilation was reduced by mechanical denudation of the endothelium as well as pre-treatment with L-NAME, indomethacin or glibenclamide. These results indicate that Gmelina arborea hexane extract possesses bioactive compounds with antioxidant and vasorelaxant properties.
authors.affiliation: University of Dschang, Cameroon.
authors.forename: Sylvie L
authors.initials: SL
authors.lastname: Wansi
authors.forename: Paulin
authors.initials: P
authors.lastname: Nyadjeu
authors.forename: Télesphore Benoît
authors.initials: TB
authors.lastname: Nguelefack
authors.forename: Siaka F K
authors.initials: SF
authors.lastname: Fodouop
authors.forename: Atsamo Albert
authors.initials: AA
authors.lastname: Donatien
authors.forename: Albert
authors.initials: A
authors.lastname: Kamanyi
mesh_terms: D000818:Animals; D000959:Antihypertensive Agents / Q000008:administration & dosage / Q000494:pharmacology*; D001013:Aorta, Thoracic / Q000033:anatomy & histology / Q000187:drug effects; D015415:Biomarkers / Q000378:metabolism; D001835:Body Weight / Q000187:drug effects; D005260:Female; D006352:Heart Ventricles / Q000033:anatomy & histology / Q000187:drug effects; D006586:Hexanes; D007668:Kidney / Q000033:anatomy & histology / Q000187:drug effects; D019686:Lamiaceae; D050356:Lipid Metabolism / Q000187:drug effects; D008099:Liver / Q000033:anatomy & histology / Q000187:drug effects; D008297:Male; D009929:Organ Size / Q000187:drug effects; D018384:Oxidative Stress / Q000187:drug effects*; D010936:Plant Extracts / Q000008:administration & dosage / Q000494:pharmacology*; D018515:Plant Leaves; D010946:Plants, Medicinal; D011897:Random Allocation; D051381:Rats; D017208:Rats, Wistar; D014664:Vasodilation / Q000187:drug effects*
chemical_list: D000959:Antihypertensive Agents; D015415:Biomarkers; D006586:Hexanes; D010936:Plant Extracts