Protection from oxidation enhances the survival of cultured mesencephalic neurons

Exp Neurol. 1995 Mar;132(1):54-61. doi: 10.1016/0014-4886(95)90058-6.


Oxidative stress has been linked to the destruction of dopaminergic neurons in the substantia nigra and may be a significant factor in both Parkinson's disease and MPTP toxicity. Using primary cultures of embryonic rat mesencephalon and standard immunocytochemical techniques, we have examined the survival of tyrosine hydroxylase-containing (TH+) neurons cultured in the presence of antioxidants and/or in an environment of low oxygen partial pressure. The number of TH+ neurons increased approximately twofold if superoxide dismutase, glutathione peroxidase (GP), or N-acetyl cysteine (NAC) were added to the culture media. Exposure of the neurons to a 5% oxygen environment (38 torr, i.e., 38 mm Hg) also increased the survival of TH+ neurons by about twofold. A dramatic enhancement of survival, however, was seen when NAC was used in combination with the 5% oxygen environment. In this case, the number of TH+ neurons increased fourfold from nontreated controls. Morphological changes were also noted. GP increased the average neurite length while NAC increased the average area of the cell body in the TH+ neuron. These results suggest that manipulation of oxidative conditions by changing the ambient O2 tension or the level of antioxidants promotes survival of TH+ neurons in culture and may have implications for transplantation therapies in Parkinson's disease.

MeSH terms

  • Acetylcysteine / pharmacology*
  • Animals
  • Cell Survival / drug effects
  • Cells, Cultured
  • Glutathione Peroxidase / pharmacology*
  • Mesencephalon / cytology*
  • Mesencephalon / metabolism*
  • Neurons / cytology
  • Neurons / enzymology
  • Oxidative Stress
  • Oxygen / metabolism*
  • Rats
  • Reactive Oxygen Species / pharmacology*
  • Superoxide Dismutase / pharmacology*
  • Tyrosine 3-Monooxygenase / metabolism


  • Reactive Oxygen Species
  • Glutathione Peroxidase
  • Tyrosine 3-Monooxygenase
  • Superoxide Dismutase
  • Oxygen
  • Acetylcysteine