Airway synthesis of 20-hydroxyeicosatetraenoic acid: Metabolism by cyclooxygenase to a bronchodilator

Elizabeth R. Jacobs, Richard M. Effros, John R. Falck, K. Malla Reddy, William B. Campbell, Daling Zhu

Research output: Contribution to journalArticle

33 Scopus citations

Abstract

Rabbit airway tissue is a particularly rich source of cytochrome P- 4504A protein, but very little information regarding the effect(s) of 20- hydroxyeicosatetraenoic acid (20-HETE) on bronchial tone is available. Our studies examined the response of rabbit bronchial rings to 20-HETE and the metabolism of arachidonic acid and 20-HETE from airway microsomes. 20-HETE (10-8 to 10-6 M) produced a concentration-dependent relaxation of bronchial rings precontracted with KCl or histamine but not with carbachol. Relaxation to 20-HETE was blocked by indomethacin or epithelium removal, consistent with the conversion of 20-HETE to a bronchial relaxant by epithelial cyclooxygenase. A cyclooxygenase product of 20-HETE also elicited relaxation of bronchial rings. [14C]arachidonic acid was converted by airway microsomes to products that comigrated with authentic 20-HETE (confirmed by gas chromatography-mass spectrometry as 19- and 20-HETE) and to unidentified polar metabolites. [3H]20-HETE was metabolized to indomethacin- inhibitable products. These data suggest that 20-HETE is an endogenous product of rabbit airway tissue and may modulate airway resistance in a cyclooxygenase-dependent manner.

Original languageEnglish (US)
Pages (from-to)L280-L288
JournalAmerican Journal of Physiology - Lung Cellular and Molecular Physiology
Volume276
Issue number2 20-2
StatePublished - Feb 1 1999

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Keywords

  • Arachidonic acid
  • Bronchi
  • Bronchodilation
  • Cytochrome P-450
  • Eicosanoid

ASJC Scopus subject areas

  • Physiology
  • Pulmonary and Respiratory Medicine
  • Physiology (medical)
  • Cell Biology

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