Modulation of endothelium-dependent responses by chronic alterations of blood flow

V. M. Miller, L. L. Aarhus, P. M. Vanhoutte

Research output: Contribution to journalArticle

118 Scopus citations

Abstract

To determine whether the blood flow and O2 tension to which a blood vessel is chronically exposed could modulate endothelium-dependent responses, these parameters were altered in the dog either by causing partial occlusion of the femoral artery or by creating a fistula between the femoral artery and vein. Blood flow was reduced by 75% in the clamped artery; mean arterial pressure was unchanged. In the vessels proximal to the fistula, blood flow was elevated and O2 tensions were similar in the vein and artery. After 6 wk the femoral arteries and veins were excised, and their endothelium-dependent responses were studied in vitro. The endothelium-dependent relaxations to acetylcholine, adenosine diphosphate, and α2-adrenergic stimulation were augmented in fistula-operated compared with sham-operated arteries. The responses to these agents in the clamp-operated vessels were not different from those of the sham-operated ones. Relaxation to arachidonic acid in the arteries showed an inverse relationship to blood flow. In the veins proximal to the fistula, the endothelium-dependent relaxations to acetylcholine were augmented and an endothelium-dependent relaxation to α2-adrenergic stimulation was present; only a contractile response was observed in veins from the sham-operated limb in response to the latter. These studies suggest a pattern of increased endothelium-dependent relaxation in vessels exposed to chronically elevated blood flow.

Original languageEnglish (US)
Pages (from-to)H520-H527
JournalAmerican Journal of Physiology - Heart and Circulatory Physiology
Volume251
Issue number3 (20/3)
DOIs
StatePublished - Jan 1 1986

ASJC Scopus subject areas

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

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