Induction of metallothionein-I (MT-I) mRNA in primary astrocyte cultures is mediated by hypotonicity and not ethanol (EtOH) per se

Michael Aschner, Dawn R. Conklin, Judy L. Aschner

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4 Scopus citations


Metallothionein (MT) mRNA was determined in rat astrocyte cultures in response to ethanol (EtOH). MT-I mRNA was significantly increased after 6 h exposure to isosmotic EtOH, but not hyperosmotic EtOH. Exposure to a hyposmotic/hypotonic solution also led to a significant increase in the expression of astrocytic MT-I mRNA. The large increase in MT-I mRNA was not due to removal of extracellular NaCl, because this effect was reversed by replacement of NaCl with N-methyl D-glucamine chloride. A significant decrease in MT-I mRNA was also noted in astrocytes exposed to an EtOH-free hyperosmotic/hypertonic solution. These results suggest (1) that EtOH per se does not directly induce MT-I mRNA expression, (2) that the induction by EtOH of MT-I mRNA is secondary to hypotonicity, and (3) that hyperosmotic/hypertonic exposure is associated with reduced expression of MT-I mRNA in astrocyte cultures.

Original languageEnglish (US)
Pages (from-to)289-293
Number of pages5
JournalBrain Research
Issue number1-2
Publication statusPublished - Oct 3 1997



  • Astrocyte
  • Ethanol
  • Hypotonic
  • In vitro
  • Metallothionein
  • Rat
  • mRNA

ASJC Scopus subject areas

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

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