title: Evaluation of antioxidant activity of grapevine leaves extracts (Vitis labrusca) in liver of Wistar rats.
abstract: The aim of this study was to evaluate the hepatoprotection of organic and conventional grapevine leaves extract (Vitis labrusca). The total polyphenol content and the isolate polyphenols by HPLC were evaluate. The animals received intraperitoneal injections of saline or extracts (conventional or organic - 30 mg/kg) for 14 days. On day 15, the rats received carbon tetrachloride (CCl4) or mineral oil (i.p.). After 4h, the animals were euthanized. The analysis of the liver enzymes activity (AST, ALT, GGT) was performed using serum, obtained by blood and the levels of lipid peroxidation (TBARS), protein oxidation (carbonyl), and the activity of antioxidant enzymes superoxide dismutase and catalase were analyzed in the liver. The results showed that the organic extract is richer in polyphenol and resveratrol than the conventional one. Both extracts prevent lipid peroxidation and protein oxidation generated by CCl4. Moreover, the extracts demonstrated ability to modulate the activity of SOD and CAT, as well as to establish a balance in the ratio of SOD/CAT. We also found that the CCl4 increased the levels of AST and GGT, and that both extracts prevent this. These results indicate that grapevine leaves extracts, both, organic and conventional, can prevent liver disorders.
authors.affiliation: Centro Universitário Metodista, Porto Alegre, RS, Brasil.
authors.forename: Thays K
authors.initials: TK
authors.lastname: Schaffer
authors.affiliation: Centro Universitário Metodista, Porto Alegre, RS, Brasil.
authors.forename: Mariane F
authors.initials: MF
authors.lastname: Wohlenberg
authors.affiliation: Centro Universitário Metodista, Porto Alegre, RS, Brasil.
authors.forename: Niara
authors.initials: N
authors.lastname: Medeiros
authors.affiliation: Centro Universitário Metodista, Porto Alegre, RS, Brasil.
authors.forename: Jéssica B
authors.initials: JB
authors.lastname: Martins
authors.affiliation: Universidade de Caxias do Sul, Caxias do Sul, RS, Brasil.
authors.forename: Fabiana
authors.initials: F
authors.lastname: Agostini
authors.affiliation: Centro Universitário Metodista, Porto Alegre, RS, Brasil.
authors.forename: Cláudia
authors.initials: C
authors.lastname: Funchal
authors.affiliation: Centro Universitário Metodista, Porto Alegre, RS, Brasil.
authors.forename: Caroline
authors.initials: C
authors.lastname: Dani
mesh_terms: D000818:Animals; D000975:Antioxidants / Q000494:pharmacology*; D002251:Carbon Tetrachloride; D015227:Lipid Peroxidation / Q000187:drug effects*; D008099:Liver / Q000187:drug effects* / Q000201:enzymology; D008297:Male; D018384:Oxidative Stress / Q000187:drug effects; D010936:Plant Extracts / Q000494:pharmacology*; D018515:Plant Leaves / Q000737:chemistry; D020011:Protective Agents / Q000494:pharmacology*; D051381:Rats; D017208:Rats, Wistar; D027843:Vitis / Q000737:chemistry*
chemical_list: D000975:Antioxidants; D010936:Plant Extracts; D020011:Protective Agents; D002251:Carbon Tetrachloride