title: Potential in vitro antioxidant and protective effects of Gymnema montanum H. on alloxan-induced oxidative damage in pancreatic beta-cells, HIT-T15.
abstract: The present study describes the antioxidant activities of ethanol extract from Gymnema montanum (GLEt) which is an endemic plant of India. Antioxidant activity of the GLEt was studied in vitro based on scavenging of hydroxyl radicals, superoxide anions, nitric oxide, hydrogen peroxide, peroxynitrite, reducing power and inhibition of lipid peroxidation estimated in terms of thiobarbituric acid reactive substances (TBARS). Further, we examined its protective effect against alloxan-induced oxidative stress in pancreatic beta-cells, HIT-T15 by measuring the free radical generation, malonaldehyde formation and antioxidant levels such as CAT, GPx and GSH. Results showed that G. montanum leaves exhibited significant antioxidant activities measured by various in vitro model systems. The HIT-T15 cell line studies showed the tendency of GLEt to increase antioxidant levels meanwhile decrease the free radical formation and inhibit the lipid peroxidation. The antioxidant activity was found to be well correlated with the phenolic phytochemicals present in the extract. GC-MS analyses revealed the presence of few phenolic compounds in the extract. As this plant has already been demonstrated for a variety of medicinal properties from our laboratory, results of this study suggest that G. montanum is an interesting source for antioxidant compounds and useful for various therapeutic applications.
authors.affiliation: Department of Biotechnology, Anna University-Tiruchirappalli, Tamil Nadu, India. ramkumarbiotech@gmail.com
authors.forename: Kunga Mohan
authors.initials: KM
authors.lastname: Ramkumar
authors.forename: Chinnasamy
authors.initials: C
authors.lastname: Manjula
authors.forename: Lakshmanan
authors.initials: L
authors.lastname: Sankar
authors.forename: Sarvajayakesavalu
authors.initials: S
authors.lastname: Suriyanarayanan
authors.forename: Palanisamy
authors.initials: P
authors.lastname: Rajaguru
mesh_terms: D000496:Alloxan / Q000633:toxicity*; D000818:Animals; D001713:Biphenyl Compounds / Q000737:chemistry; D045744:Cell Line, Tumor; D002470:Cell Survival / Q000187:drug effects; D006224:Cricetinae; D016166:Free Radical Scavengers / Q000737:chemistry / Q000494:pharmacology*; D008401:Gas Chromatography-Mass Spectrometry; D031103:Gymnema / Q000737:chemistry*; D050417:Insulin-Secreting Cells / Q000187:drug effects* / Q000378:metabolism / Q000473:pathology; D007340:Insulinoma; D015227:Lipid Peroxidation / Q000187:drug effects; D008647:Mesocricetus; D018384:Oxidative Stress / Q000187:drug effects*; D010088:Oxidoreductases / Q000378:metabolism; D010851:Picrates / Q000737:chemistry; D010936:Plant Extracts / Q000737:chemistry / Q000494:pharmacology*; D017382:Reactive Oxygen Species / Q000378:metabolism; D013481:Superoxides / Q000737:chemistry
chemical_list: D001713:Biphenyl Compounds; D016166:Free Radical Scavengers; D010851:Picrates; D010936:Plant Extracts; D017382:Reactive Oxygen Species; D013481:Superoxides; D000496:Alloxan; C004931:1,1-diphenyl-2-picrylhydrazyl; D010088:Oxidoreductases