title: Antioxidant activities of seabuckthorn (Hippophae rhamnoides) during hypoxia induced oxidative stress in glial cells.
abstract: The present study reports the cytoprotective and antioxidant properties of alcoholic leaf extract of seabuckthorn (SBT) against hypoxia induced oxidative stress in C-6 glioma cells. Exposure of cells to hypoxia for 12 h resulted in a significant increase in cytotoxicity and decrease in mitochondrial transmembrane potential compared to the controls. Further an appreciable increase in nitric oxide and reactive oxygen species (ROS) production was noted which in turn was responsible for fall in intracellular antioxidant levels and GSH/GSSG ratio. There was a significant increase in DNA damage during hypoxia as revealed by comet assay. Pretreatment of cells with alcoholic leaf extract of SBT at 200 mug/ml significantly inhibited cytotoxicity, ROS production and maintained antioxidant levels similar to that of control cells. Further, the leaf extract restored the mitochondrial integrity and prevented the DNA damage induced by hypoxia. These results indicate that the leaf extract of SBT has strong antioxidant and cytoprotective activity against hypoxia induced oxidative injury.
authors.affiliation: Defence Institute of Physiology and Allied Sciences, Timarpur, Delhi, India.
authors.forename: S
authors.initials: S
authors.lastname: Narayanan
authors.forename: D
authors.initials: D
authors.lastname: Ruma
authors.forename: B
authors.initials: B
authors.lastname: Gitika
authors.forename: S K
authors.initials: SK
authors.lastname: Sharma
authors.forename: T
authors.initials: T
authors.lastname: Pauline
authors.forename: M Sai
authors.initials: MS
authors.lastname: Ram
authors.forename: G
authors.initials: G
authors.lastname: Ilavazhagan
authors.forename: R C
authors.initials: RC
authors.lastname: Sawhney
authors.forename: D
authors.initials: D
authors.lastname: Kumar
authors.forename: P K
authors.initials: PK
authors.lastname: Banerjee
mesh_terms: D000975:Antioxidants / Q000494:pharmacology*; D015687:Cell Hypoxia; D020552:Comet Assay; D031281:Hippophae / Q000737:chemistry*; D008928:Mitochondria / Q000187:drug effects; D009457:Neuroglia / Q000166:cytology / Q000187:drug effects; D009569:Nitric Oxide / Q000378:metabolism / Q000494:pharmacology; D018384:Oxidative Stress / Q000187:drug effects*; D010936:Plant Extracts / Q000737:chemistry / Q000494:pharmacology; D018515:Plant Leaves / Q000737:chemistry; D017382:Reactive Oxygen Species / Q000378:metabolism
chemical_list: D000975:Antioxidants; D010936:Plant Extracts; D017382:Reactive Oxygen Species; D009569:Nitric Oxide