Impairment of nitric oxide synthase-dependent dilatation of cerebral arterioles during infusion of nicotine

Qin Fang, Hong Sun, William G. Mayhan

Research output: Contribution to journalArticle

41 Citations (Scopus)

Abstract

The effects of nicotine on nitric oxide synthase (NOS)-dependent reactivity of cerebral arterioles remain uncertain. Our first goal was to examine whether infusion of nicotine alters NOS-dependent reactivity of cerebral arterioles. Our second goal was to examine the mechanisms that may account for the effects of nicotine on cerebral arterioles. We measured the diameter of pial arterioles to NOS-dependent (ADP and acetylcholine) and NOS-independent (nitroglycerin) agonists before and after the infusion of nicotine (2 μg·kg-1·min-1 iv for 30 min, followed by a maintenance dose of 0.35 μg·kg-1·min-1). ADP- and acetylcholine-induced vasodilatation was impaired after the infusion of nicotine. In contrast, nicotine did not alter vasodilatation to nitroglycerin. Next, we examined whether the impaired responses of pial arterioles during infusion of nicotine may be related to oxygen radicals. We found that application of superoxide dismutase or tetrahydrobiopterin during infusion of nicotine could prevent impaired NOS-dependent vasodilatation. Thus acute exposure of cerebral vessels to nicotine specifically impairs NOS-dependent dilatation via the production of oxygen radicals possibly related to an alteration in the utilization of tetrahydrobiopterin.

Original languageEnglish (US)
Pages (from-to)H528-H534
JournalAmerican Journal of Physiology - Heart and Circulatory Physiology
Volume284
Issue number2 53-2
StatePublished - Feb 1 2003

Fingerprint

Arterioles
Nicotine
Nitric Oxide Synthase
Dilatation
Vasodilation
Nitroglycerin
Adenosine Diphosphate
Acetylcholine
Reactive Oxygen Species
Superoxide Dismutase

Keywords

  • ADP
  • Acetylcholine
  • Nitroglycerin
  • Oxygen radicals
  • Superoxide dismutase
  • Tetrahydrobiopterin
  • Vasoreactivity

ASJC Scopus subject areas

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

Cite this

Impairment of nitric oxide synthase-dependent dilatation of cerebral arterioles during infusion of nicotine. / Fang, Qin; Sun, Hong; Mayhan, William G.

In: American Journal of Physiology - Heart and Circulatory Physiology, Vol. 284, No. 2 53-2, 01.02.2003, p. H528-H534.

Research output: Contribution to journalArticle

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