Effect of systemic nitric oxide synthase inhibition on arterial stiffness in humans

Jun Sugawara, Hidehiko Komine, Koichiro Hayashi, Mutsuko Yoshizawa, Takashi Yokoi, Takeshi Otsuki, Nobutake Shimojo, Takashi Miyauchi, Seiji Maeda, Hirofumi Tanaka

Research output: Contribution to journalArticlepeer-review

38 Citations (Scopus)

Abstract

Stiffening of large elastic arteries impairs the buffering function of the arterial system and contributes to cardiovascular disease. The aim of this study was to determine whether endothelium-derived nitric oxide (NO) modulates the stiffness of large elastic arteries in humans. Seven apparently healthy adults (60±3 years, 2 males and 5 females) underwent systemic α-adrenergic blockade (phentolamine) and systemic NO synthase inhibition using NG-monomethyl-L-arginine (L-NMMA) in sequence. Phentolamine was given first to isolate contribution of NO to arterial stiffness by preventing reflex changes in sympathetic tone that result from systemic NO synthase inhibition, and also to compare arterial stiffness at a similar mean arterial pressure. Mean arterial blood pressure decreased (p<0.05) after phentolamine infusion but returned to baseline levels after L-NMMA infusion. The carotid β-stiffness index (via simultaneous ultrasound and applanation tonometry on the common carotid artery) did not change after the restraint of systemic α-adrenergic nerve activity (9.8±1.2 vs. 9.1±1.1 U) but increased (p<0.05) after NO synthase inhibition (12.6±2.0 U). These results suggest that NO appears to modulate central arterial stiffness in humans.

Original languageEnglish
Pages (from-to)411-415
Number of pages5
JournalHypertension Research
Volume30
Issue number5
DOIs
Publication statusPublished - 2007 May
Externally publishedYes

Keywords

  • Arterial compliance
  • Endothelium
  • Sympathetic nervous system

ASJC Scopus subject areas

  • Internal Medicine
  • Physiology
  • Cardiology and Cardiovascular Medicine

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