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Decrease in acrolein toxicity based on the decline of polyamine oxidases.

Takeshi Uemura1, Mizuho Nakamura1, Akihiko Sakamoto2

  • 1Amine Pharma Research Institute, Innovation Plaza at Chiba University, 1-8-15 Inohana, Chuo-ku, Chiba, 260-0856, Japan.

The International Journal of Biochemistry & Cell Biology
|September 4, 2016
PubMed
Summary
This summary is machine-generated.

Acrolein causes cell damage in brain and kidney conditions. Researchers identified reduced acrolein-producing enzymes, polyamine oxidases (PAO), in resistant Neuro2a cells, revealing a key detoxification mechanism.

Keywords:
AP-1 (FosB and JunB) transcription factorsAcrolein toxicity-decreasing cellsC/EBPβ transcription factorGlutathionePolyamine oxidasesPolyamines

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Toxicology

Background:

  • Acrolein is implicated in cellular damage during brain infarction and chronic renal failure.
  • Understanding acrolein detoxification mechanisms is crucial for addressing associated pathologies.
  • Previous studies identified increased glutathione (GSH) in acrolein-detoxified cells (Neuro2a-ATD1).

Purpose of the Study:

  • To investigate the molecular mechanisms underlying reduced acrolein sensitivity in Neuro2a cells.
  • To identify key enzymes and regulatory factors involved in acrolein detoxification.
  • To elucidate the role of polyamine oxidases (PAO) in acrolein production and toxicity.

Main Methods:

  • Isolation and characterization of acrolein-tolerant Neuro2a cell lines (Neuro2a-ATD2).
  • Analysis of polyamine oxidase (PAO) enzyme levels (AcPAO, SMO) and their transcriptional regulation.
  • Quantitative analysis of transcription factors FosB and C/EBPβ.
  • siRNA-mediated gene silencing and promoter activity assays.
  • Assessment of acrolein toxicity (IC50) and cellular responses.

Main Results:

  • Neuro2a-ATD2 cells exhibited reduced levels of acetylpolyamine oxidase (AcPAO) and spermine oxidase (SMO) due to transcriptional downregulation.
  • Acrolein sensitivity (IC50) increased in Neuro2a-ATD2 cells (from 4.2 to 6.8μM).
  • Levels of transcription factors FosB and C/EBPβ were reduced in Neuro2a-ATD2 cells.
  • FosB and C/EBPβ regulate AcPAO and SMO gene expression, with C/EBPβ also influencing FosB synthesis.
  • Reduced C/EBPβ directly impacted SMO promoter activity, confirming its role in acrolein detoxification.
  • Overexpression of AcPAO or SMO in Neuro2a cells increased acrolein toxicity.

Conclusions:

  • Acrolein is primarily produced from polyamines via polyamine oxidases (PAO).
  • Reduced expression of PAO enzymes, regulated by transcription factors FosB and C/EBPβ, confers resistance to acrolein toxicity.
  • This study elucidates a novel pathway for acrolein detoxification involving transcriptional control of PAO.