Functional NOS 1 in the rat mesenteric arterial bed

Jennifer C. Sullivan, Ararat D. Giulumian, David M. Pollock, Leslie C. Fuchs, Jennifer S. Pollock

Research output: Contribution to journalArticlepeer-review

18 Scopus citations


Previously we have demonstrated functional nitric oxide synthase (NOS) 1 in large arteries. Because resistance arteries largely determine blood pressure, this study examined whether functional NOS 1 also exists in resistance arteries. Phenylephrine (PE) contraction was measured in the absence and presence of the NOS 1 inhibitor N5-(1-imino-3-butenyl)-L-ornithine (VNIO) in isolated mesenteric resistance arteries (endothelium intact and denuded) from Sprague-Dawley rats. For NOS 1 activity and expression, the mesenteric arterial bed was separated into cytosolic and particulate fractions. NOS activity was assayed by measuring the conversion of [3H]arginine to [3H]citrulline inhibited by a nonselective NOS inhibitor or VNIO. VNIO increased PE sensitivity in endothelium-intact and -denuded arteries. In cytosolic and particulate fractions of the arterial bed, ∼40% of NOS activity was inhibited by VNIO. Immunoprecipitation and Western blot analysis revealed two NOS 1 immunoreactive bands. One band corresponded to the rat brain isoform, whereas the second was of a slightly lower molecular mass. The cytosolic fraction contained both isoforms; however, the particulate fraction had only the lower molecular mass form. These studies demonstrate the existence of functional NOS 1 in resistance arteries.

Original languageEnglish (US)
Pages (from-to)H658-H663
JournalAmerican Journal of Physiology - Heart and Circulatory Physiology
Issue number2 52-2
StatePublished - 2002


  • Neuronal nitric oxide synthase activity
  • Resistance arteries
  • Subcellular fractionation
  • Vascular reactivity

ASJC Scopus subject areas

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


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