Peroxynitrite relaxes canine coronary arteries in both hypoxia and reperfusion

M. R. Oeltjen, D. G. Cable, Hartzell V Schaff

Research output: Contribution to journalArticle

Abstract

Peroxynitrite (ONO2) is a noxious metabolite of nitric oxide previously shown to relax arteries during normoxia; however the vascular effects of ONO2 during hypoxia or reperfusion have not been examined. We investigated the influence of ONO2 on canine coronary arteries suspended in organ chambers during normoxia (5%CO2/95%O2), hypoxia (5%CO2/95%N2) and after a 15min hypoxic insult. Arteries were stretched to optimal length-tension and prostaglandin F (2×10-6M) contracted Vessels maintained at normoxia relaxed completely to ONO2 (10-9-10-5M, n=5), and similar ONO2-induced relaxations occurred in endothelial-denuded arteries (n=4). Arteries exposed to hypoxia after precontraction also relaxed in a similar fashion (n=5, P=NS, ANOVA). Arteries were exposed to a hypoxic insult for 15min, reoxygenated for 15min, and then contracted. Relaxation to ONO2 was similar to controls maintained in normoxia for the same period of time (n=4). Methylene blue was added prior to ONO2 dose-response curves in paired experiments. Mild attenuation of the relaxation was noted in all groups (n=4, P=NS). This study demonstrates peroxynitrite-induced relaxations during normoxia, hypoxia, or after a 15min hypoxic insult which are not altered by inhibition of soluble guanylate cyclase.

Original languageEnglish (US)
JournalFASEB Journal
Volume11
Issue number3
StatePublished - 1997

Fingerprint

Peroxynitrous Acid
normoxia
coronary vessels
arteries
Reperfusion
Canidae
hypoxia
Coronary Vessels
Arteries
Dinoprost
dogs
Guanylate Cyclase
Methylene Blue
Metabolites
Analysis of variance (ANOVA)
Nitric Oxide
guanylate cyclase
methylene blue
blood vessels
Experiments

ASJC Scopus subject areas

  • Agricultural and Biological Sciences (miscellaneous)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Biochemistry
  • Cell Biology

Cite this

Peroxynitrite relaxes canine coronary arteries in both hypoxia and reperfusion. / Oeltjen, M. R.; Cable, D. G.; Schaff, Hartzell V.

In: FASEB Journal, Vol. 11, No. 3, 1997.

Research output: Contribution to journalArticle

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