A Novel Role for Glyceraldehyde-3-Phosphate Dehydrogenase and Monoamine Oxidase B Cascade in Ethanol-Induced Cellular Damage

Xiao Ming Ou*, Craig A. Stockmeier, Herbert Y. Meltzer, James C. Overholser, George J. Jurjus, Lesa Dieter, Kevin Chen, Deyin Lu, Chandra Johnson, Moussa B H Youdim, Mark C. Austin, Jia Luo, Akira Sawa, Warren May, Jean C. Shih

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

42 Scopus citations

Abstract

Background: Alcoholism is a major psychiatric condition at least partly associated with ethanol (EtOH)-induced cell damage. Although brain cell loss has been reported in subjects with alcoholism, the molecular mechanism is unclear. Glyceraldehyde-3-phosphate dehydrogenase (GAPDH) and monoamine oxidase B (MAO B) reportedly play a role in cellular dysfunction under stressful conditions and might contribute to EtOH-induced cell damage. Methods: Expression of GAPDH and MAO B protein was studied in human glioblastoma and neuroblastoma cell lines exposed to physiological concentrations of EtOH. Expression of these proteins was also examined in the prefrontal cortex from human subjects with alcohol dependence and in rats fed with an EtOH diet. Coimmunoprecipitation, subcellular fractionation, and luciferase assay were used to address nuclear GAPDH-mediated MAO B activation. To test the effects of inactivation, RNA interference and pharmacological intervention were used, and cell damage was assessed by terminal deoxynucleotidyl transferase (TdT)-mediated dUTP Nick End Labeling (TUNEL) and hydrogen peroxide measurements. Results: Ethanol significantly increases levels of GAPDH, especially nuclear GAPDH, and MAO B in neuronal cells as well as in human and rat brains. Nuclear GAPDH interacts with the transcriptional activator, transforming growth factor-β-inducible early gene 2 (TIEG2), and augments TIEG2-mediated MAO B transactivation, which results in cell damage in neuronal cells exposed to EtOH. Knockdown expression of GAPDH or treatment with MAO B inhibitors selegiline (deprenyl) and rasagiline (Azilect) can block this cascade. Conclusions: Ethanol-elicited nuclear GAPDH augments TIEG2-mediated MAO B, which might play a role in brain damage in subjects with alcoholism. Compounds that block this cascade are potential candidates for therapeutic strategies.

Original languageEnglish (US)
Pages (from-to)855-863
Number of pages9
JournalBiological psychiatry
Volume67
Issue number9
DOIs
StatePublished - May 1 2010

Keywords

  • Alcoholism
  • ethanol-induced brain cell dysfunction
  • glyceraldehyde-3-phosphate dehydrogenase
  • human brain tissues
  • monoamine oxidase B
  • rats fed with an ethanol diet

ASJC Scopus subject areas

  • Biological Psychiatry

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