Regional and systemic hemodynamic responses following the creation of a murine arteriovenous fistula

Lu Kang, Satsuki Yamada, Melissa C. Hernandez, Anthony J. Croatt, Joseph P. Grande, Julio P. Juncos, Gregory M. Vercellotti, Robert P. Hebbel, Zvonimir S. Katusic, Andre Terzic, Karl A. Nath

Research output: Contribution to journalArticle

16 Scopus citations

Abstract

The study of hemodynamic alterations following the creation of an arteriovenous fistula (AVF) is relevant to vascular adaptive responses and hemodialysis access dysfunction. This study examined such alterations in a murine AVF created by anastomosing the carotid artery to the jugular vein. AVF blood flow was markedly increased due to reduced AVF vascular resistance. Despite such markedly increased basal blood flow, AVF blood flow further increased in response to acetylcholine. This AVF model exhibited increased cardiac output and decreased systemic vascular resistance; the kidney, in contrast, exhibited decreased blood flow and increased vascular resistance. Augmentation in AVF blood flow was attended by increased arterial heme oxygenase-1 (HO-1) mRNA and protein expression, the latter localized to smooth muscle cells of the AVF artery; AVF blood flow was substantially reduced in HO-1 -/- mice compared with HO-1 +/+ mice. Finally, in a murine model of a representative disease known to exhibit impaired hemodynamic responses (sickle cell disease), the creation of an AVF was attended by decreased AVF flow and impaired AVF function. We conclude that this AVF model exhibits markedly increased AVF blood flow, a vasodilatory reserve capacity, increased cardiac output, decreased renal blood flow, and a dependency on intact hemodynamic responses, in general, and HO-1 expression, in particular, in achieving and maintaining AVF blood flow. We suggest that these findings support the utility of this model in investigating the basis for and the consequences of hemodynamic stress, including shear stress, and the pathobiology of hemodialysis AVF dysfunction.

Original languageEnglish (US)
Pages (from-to)F845-F851
JournalAmerican Journal of Physiology - Renal Physiology
Volume301
Issue number4
DOIs
StatePublished - Oct 2011

Keywords

  • Heme oxygenase-1
  • Shear stress
  • Sickle cell disease
  • Vascular access dysfunction
  • Vascular adaptation

ASJC Scopus subject areas

  • Physiology
  • Urology

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