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All-trans retinoic acid mediates DUOX2 expression and function in respiratory tract epithelium

Angela Lee Linderholm1, June Onitsuka, Changhong Xu

  • 1Department of Internal Medicine, University of California, Davis, USA.

American Journal of Physiology. Lung Cellular and Molecular Physiology
|June 1, 2010
PubMed

Insights

All-trans retinoic acid (ATRA) significantly increases DUOX2 expression and hydrogen peroxide production in respiratory epithelial cells. ATRA is crucial for DUOX2 regulation and rhinovirus-induced DUOX2 activity.

Area of Science:

  • Biochemistry
  • Cell Biology
  • Respiratory Medicine

Background:

  • DUOX1 and DUOX2 enzymes produce hydrogen peroxide in various epithelia.
  • Regulation of DUOX1 and DUOX2 expression across tissues remains unclear.
  • Respiratory tract epithelial cells are a key site for DUOX activity.

Purpose of the Study:

  • Investigate DUOX mRNA and protein expression during respiratory epithelial cell differentiation.
  • Determine the role of all-trans retinoic acid (ATRA) in DUOX2 regulation.
  • Examine ATRA's influence on DUOX2 inducibility by rhinovirus.

Main Methods:

  • Utilized HBE1 cell line and primary tracheobronchial epithelial (TBE) cells.
  • Analyzed DUOX mRNA and protein levels with and without ATRA treatment.
  • Measured DUOX-mediated hydrogen peroxide production.
  • Assessed DUOX2 response to rhinovirus in the presence of ATRA.

Main Results:

  • ATRA significantly upregulated DUOX2 mRNA (6-fold in HBE1, 19-fold in TBE cells) and protein.
  • ATRA treatment led to increased DUOX-mediated hydrogen peroxide production.
  • Rhinovirus-induced DUOX2 expression was dependent on ATRA.
  • ATRA did not affect DUOX1 expression.

Conclusions:

  • ATRA is a critical regulator of DUOX2 expression and function in respiratory epithelial cells.
  • ATRA enhances DUOX2-mediated hydrogen peroxide production.
  • ATRA is essential for rhinovirus-induced DUOX2 upregulation in this context.

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