title: Modulatory effect of methanolic extract of Vernonia amygdalina (MEVA) on tert-butyl hydroperoxide-induced erythrocyte haemolysis.
abstract: Reactive oxygen species (ROS) have been implicated in the aetiology of several pathological and degenerative diseases. The protective effect of natural products possessing antioxidant properties has played a crucial role in ameliorating these deleterious effects. This study investigated the chemoprotective properties of the methanolic extract of Vernonia amygdalina (MEVA) in an experimental model of tert-butyl hydroperoxide (t-BHP)-induced human erythrocyte lysis in vitro. Haemolysis was induced by incubating erythrocytes with t-BHP (2 and 3 mM) in vitro. Samples of erythrocyte suspensions were removed at different intervals over a 6-h period, and the degree of haemolysis was measured. The anti-haemolytic effect of MEVA at 25-150 µg ml(-1) concentrations on the samples were assessed and compared with Triton X-100. Administration of t-BHP at 2- and 3-mM concentrations significantly (p < 0.05) induced erythrocyte lysis by 37.5% and 31.4%, respectively. The addition of MEVA, however, reduced t-BHP-induced erythrocyte lysis significantly (p < 0.05) by 39.3%, 48.4%, 67.3% and 73.4% at 25, 50, 100 and 150 µg ml(-1) concentrations, respectively. MEVA likewise protected against t-BHP-induced lipid peroxidation significantly (p < 0.05) at 100 and 150 µg ml(-1) by the fourth hour and non-significantly (p > 0.05) at all concentrations by the sixth hour. The reduced glutathione level was, however, increased with the administration of t-BHP, while a delayed addition of MEVA had no protective effect on the t-BHP-induced cell lysis. These findings therefore suggest that MEVA may have protective antioxidant properties, making it suitable for incorporation into food and drug products.
authors.affiliation: Drug Metabolism & Toxicology Research Laboratories, Department of Biochemistry, College of Medicine, University of Ibadan, Ibadan, Nigeria.
authors.forename: Omolola A
authors.initials: OA
authors.lastname: Adesanoye
authors.forename: Olorunfemi R
authors.initials: OR
authors.lastname: Molehin
authors.forename: Adetutu A
authors.initials: AA
authors.lastname: Delima
authors.forename: Adeniyi S
authors.initials: AS
authors.lastname: Adefegha
authors.forename: Ebenezer O
authors.initials: EO
authors.lastname: Farombi
mesh_terms: D000975:Antioxidants / Q000494:pharmacology; D016923:Cell Death / Q000187:drug effects; D004912:Erythrocytes / Q000187:drug effects* / Q000378:metabolism; D006801:Humans; D015227:Lipid Peroxidation / Q000187:drug effects; D000432:Methanol; D018384:Oxidative Stress; D010936:Plant Extracts / Q000494:pharmacology*; D017382:Reactive Oxygen Species / Q000378:metabolism; D012997:Solvents; D035741:Vernonia / Q000737:chemistry*; D020122:tert-Butylhydroperoxide / Q000494:pharmacology*
chemical_list: D000975:Antioxidants; D010936:Plant Extracts; D017382:Reactive Oxygen Species; D012997:Solvents; D020122:tert-Butylhydroperoxide; D000432:Methanol