Antioxidants protect against dopamine-induced metallothionein-III (GIF) mRNA expression in mouse glial cell line (VR-2g)

Chiharu Sogawa, Ikuko Miyazaki, Norio Sogawa, Masato Asanuma, Norio Ogawa, Hiroaki Furuta

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Metallothionein (MT)-III, originally discovered as a growth inhibitory factor (GIF), is a brain specific isomer of MTs and is markedly reduced in the brain of patients with Alzheimer's disease (AD) or other neurodegenerative diseases. We analyzed the level and regulation of mRNA expression of MT-III in immortalized fetal mouse brain glial cells (VR-2g) by reverse transcriptase-polymerase chain reaction (RT-PCR). We have recently reported that dopamine (DA) increases the expression of MT-III mRNA in vitro. In this study, we investigated the mechanism of such increase by examining the effects of DA agonists (SKF38393 or bromocriptine) and DA antagonists (SCH23390 or sulpiride) on the expression of MT-III mRNA. MT-III mRNA did not change by either agonist and DA-increased MT-III mRNA was not inhibited by either antagonist. These results suggested that the induction of MT-III mRNA by DA was not mediated by stimulation of DA receptors. On the other hand, DA-induced MT-III mRNA expression was strongly inhibited by the addition of antioxidants (glutathione, vitamin E or ascorbic acid), indicating that DA-enhanced MT-III mRNA was mediated by reactive oxygen species. Our results suggest that oxidative stress may be one of the principle factors that modulate MT-III mRNA expression. Copyright (C) 2000 Elsevier Science B.V.

Original languageEnglish
Pages (from-to)310-316
Number of pages7
JournalBrain Research
Volume853
Issue number2
DOIs
Publication statusPublished - Jan 24 2000

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Keywords

  • Antioxidant
  • Dopamine
  • Dopamine receptor
  • Glial cell
  • Growth inhibitory factor (GIF)
  • Metallothionein-III

ASJC Scopus subject areas

  • Neuroscience(all)

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