The oxidant defense system in human neuroblastoma IMR-32 cells predifferentiation and postdifferentiation to neuronal phenotypes

Alejandra G. Erlejman, Patricia I. Oteiza

Research output: Contribution to journalArticle

20 Scopus citations

Abstract

Differentiated neurons were investigated for their susceptibility to oxidative damage based on variations in the oxidant defense system occurring during differentiation. The main antioxidant enzymes and substances in human neuroblastoma (IMR-32) cells were evaluated pre- and postdifferentiation to a neuronal phenotype. The activity of CuZn superoxide dismutase (CuZnSOD) and Mn superoxide dismutase (MnSOD) and the concentration of CuZnSOD were higher, but the activity and concentration of catalase were lower after differentiation. Differentiated cells had higher activity of glutathione peroxidase (GPx), lower concentration of total glutathione, a higher ratio of oxidised/reduced glutathione and lower activity of glucose-6-phosphate dehydrogenase than undifferentiated cells. We conclude that differentiated neuronal cells may be highly susceptible to oxidant-mediated damage based on the relative activities of the main antioxidant enzymes and on a limited capacity to synthesise and/or recycle glutathione.

Original languageEnglish (US)
Pages (from-to)1499-1506
Number of pages8
JournalNeurochemical Research
Volume27
Issue number11
DOIs
StatePublished - Nov 1 2002
Externally publishedYes

Keywords

  • Antioxidants
  • Differentiation
  • Free radicals
  • Glutathione
  • IMR-32 cells
  • Neuron
  • Superoxide dismutase

ASJC Scopus subject areas

  • Neuroscience(all)
  • Biochemistry

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