Oxidized proteins in astrocytes generated in a hyperbaric atmosphere induce neuronal apoptosis

Hajime Mori, Masayuki Oikawa, Tsuyoshi Tamagami, Hirokazu Kumaki, Reiko Nakaune, Jun Amano, Yukinori Akinaga, Koji Fukui, Kouichi Abe, Shiro Urano

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

In the present study, we investigated the influence of the oxidative damage to astrocytes on neuronal cell survival using cultures of rat cerebral astrocytes and neurons. The exposure of astrocytes to hyperbaric oxygen induced a time-dependent apoptotic cell death, as observed by DNA ladder assessment. When astrocytes damaged by oxidative stress were cocultured with normal neurons from the cerebrum of a newborn rat, neuronal cell death was markedly induced, although normal astrocytes not subjected to hyperoxia cocultured with normal neurons showed no neuronal cell apoptosis. It was found that either the supernatant from the homogenate of astrocytes cultured in hyperbaric oxygen atmosphere or a protein mixture extracted from the supernatant induced neuronal cell death. The level of protein carbonyls, an index of protein oxidation analysis, in cultured astrocytes increased significantly with oxidative stress, and vitamin E inhibited the increase in the level of such oxidized proteins in astrocytes. Furthermore, a two-dimensional (2D) electrophoresis of a protein mixture extracted from the supernatant showed several changes in proteins. These results imply that reactive oxygen species (ROS) induced by oxidative stress attack astrocytes to induce oxidatively denatured proteins in the cells that act as a neurotoxic factor, and that vitamin E protects neurons by inhibiting astrocyte apoptosis caused by oxidative stress.

Original languageEnglish
Pages (from-to)165-174
Number of pages10
JournalJournal of Alzheimer's Disease
Volume11
Issue number2
DOIs
Publication statusPublished - 2007 Jan 1
Externally publishedYes

Keywords

  • Apoptosis
  • Astrocyte
  • Neuron
  • Neurotoxicity
  • Oxidative stress
  • Oxidized protein
  • Vitamin E

ASJC Scopus subject areas

  • Neuroscience(all)
  • Clinical Psychology
  • Geriatrics and Gerontology
  • Psychiatry and Mental health

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  • Cite this

    Mori, H., Oikawa, M., Tamagami, T., Kumaki, H., Nakaune, R., Amano, J., Akinaga, Y., Fukui, K., Abe, K., & Urano, S. (2007). Oxidized proteins in astrocytes generated in a hyperbaric atmosphere induce neuronal apoptosis. Journal of Alzheimer's Disease, 11(2), 165-174. https://doi.org/10.3233/JAD-2007-11204