Methylmercury-induced augmentation of oxidative metabolism in cerebellar neurons dissociated from the rats: its dependence on intracellular Ca2+

Yasuo Oyama, Fukiyo Tomiyoshi, Shinya Ueno, Katsutoshi Furukawa, Lumi Chikahisa

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

Effect of methylmercury chloride on oxidative metabolism of cerebellar neurons dissociated from the rats was examined using 2′,7′-dichlorofluorescin (DCFH) which is oxidized by cellular hydrogen peroxide to be a fluorescent compound (DCF) and fluo-3, an indicator for intracellular Ca2+ concentration ([Ca2+]i). Methylmercury at 1 μM or less did not affect DCF fluorescence of cerebellar neurons. Further increase in concentration of methylmercury (up to 30 μM) induced changes in DCF fluorescence. Thus, DCF fluorescence was slightly attenuated during 5 min after applying methylmercury to the neurons, indicating a decrease in oxidation of DCFH. Thereafter, DCF fluorescence was time-dependently augmented in continued presence of methylmercury, indicating an increase in DCFH oxidation. Although methylmercury-induced augmentation of DCF fluorescence was greatly suppressed under external Ca2+-free condition, it was not the case for methylmercury-induced attenuation of DCF fluorescence. Methylmercury at 3 μM or more dose-dependently increased the [Ca2+]i. Results suggest that methylmercury increases intracellular Ca2+ in cerebellar neurons, resulting in an increase in formation of reactive oxygen species that may contribute to cell injury.

Original languageEnglish
Pages (from-to)154-157
Number of pages4
JournalBrain research
Volume660
Issue number1
DOIs
Publication statusPublished - 1994 Oct 10

Keywords

  • Ca
  • Cerebellar neuron
  • Methylmercury
  • Oxidative metabolism
  • Reactive oxygen species

ASJC Scopus subject areas

  • Neuroscience(all)
  • Molecular Biology
  • Clinical Neurology
  • Developmental Biology

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