Neuroprotective effect of gypenosides against oxidative injury in the substantia nigra of a mouse model of Parkinson's disease

J Int Med Res. May-Jun 2010;38(3):1084-92. doi: 10.1177/147323001003800336.

Abstract

Oxidative injury has been implicated in the aetiology of Parkinson's disease (PD) and gypenosides (GP), which are saponins with various bioactivities, have shown antioxidative effects in vitro. The present study was designed to evaluate the effect of GP on a 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP)-induced mouse model of PD. Acute administration of MPTP led to decreased glutathione content and reduced superoxide dismutase activity in the substantia nigra of the mice, which resulted in oxidative stress, loss of nigral dopaminergic neurons and motor dysfunction. Co-treatment with GP attenuated all the injuries induced by MPTP in a dose-dependent manner. The neuroprotective effect of GP may be attributed to increased antioxidation, as manifested by significantly increased glutathione content and enhanced superoxide dismutase activity in the substantia nigra. These results strongly indicate the possible therapeutic potential of GP as an antioxidant in PD.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Antioxidants / pharmacology*
  • Behavior, Animal / drug effects
  • Brain / drug effects
  • Brain / metabolism
  • Brain Chemistry
  • DNA Damage
  • Disease Models, Animal
  • Dopamine / analysis
  • Dopamine / metabolism
  • Glutathione / metabolism
  • Gynostemma
  • Lipid Peroxidation / drug effects
  • Mice
  • Motor Skills / drug effects
  • Neuroprotective Agents / pharmacology*
  • Oxidative Stress / drug effects*
  • Parkinsonian Disorders / drug therapy*
  • Parkinsonian Disorders / metabolism
  • Parkinsonian Disorders / physiopathology
  • Plant Extracts / pharmacology
  • Protein Carbonylation
  • Rotarod Performance Test
  • Substantia Nigra / metabolism*
  • Substantia Nigra / pathology
  • Superoxide Dismutase / metabolism

Substances

  • Antioxidants
  • Neuroprotective Agents
  • Plant Extracts
  • gypenoside
  • Superoxide Dismutase
  • Glutathione
  • Dopamine