Cytochrome P-450 ω-hydroxylase senses O2 in hamster muscle, but not cheek pouch epithelium, microcirculation

Julian H. Lombard, Mary Pat Kunert, Richard J. Roman, John R. Falck, David R. Harder, William F. Jackson

Research output: Contribution to journalArticle

38 Scopus citations

Abstract

The goal of this study was to investigate the role of cytochrome P-450 ω-hydroxylase in mediating O2-induced constriction of arterioles in the microcirculation of the hamster. Male Golden hamsters were anesthetized with pentobarbital sodium, and the cremaster muscle or cheek pouch was prepared for observation by intravital microscopy. Arteriolar diameters were measured during elevations of superfusate PO2 from ~5 to 150 mmHg. Arteriolar responses to elevated PO2 were determined in the cremaster muscle, in the retractor muscle where it inserts on the cheek pouch, and in the epithelial portion of the cheek pouch. Elevation of superfusion solution PO2 caused a vigorous constriction of arterioles in the cremaster and retractor muscles and in the epithelial portion of the cheek pouch. Superfusion with 10 μM 17- octadecynoic acid, a suicide substrate inhibitor of cytochrome P-450 ω- hydroxylase, and intravenous infusion of N-methylsulfonyl-12,12-dibromododec- 11-enamide, a mechanistically different and highly selective inhibitor of cytochrome P-450 ω-hydroxylase, caused a significant reduction in the magnitude of O2-induced constriction of arterioles in the cremaster and retractor muscles. However, arteriolar constriction in response to elevated PO2 was unaffected by 17-octadecynoic acid or N-methylsulfonyl-12,12- dibromododec-11-enamide in the epithelial portion of the cheek pouch. These data confirm that there are regional differences in the mechanism of action of O2 on the microcirculation and indicate that cytochrome P-450 ω- hydroxylase senses O2 in the microcirculation of hamster skeletal muscle, but not in the cheek pouch epithelium.

Original languageEnglish (US)
Pages (from-to)H503-H508
JournalAmerican Journal of Physiology - Heart and Circulatory Physiology
Volume276
Issue number2 45-2
DOIs
StatePublished - Feb 1999

Keywords

  • 17-Octadecynoic acid
  • 20-Hydroxyeicosatetraenoic acid
  • Arterioles
  • Oxygen
  • Vasoconstriction

ASJC Scopus subject areas

  • Physiology
  • Cardiology and Cardiovascular Medicine
  • Physiology (medical)

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