Differential regulation of nitric oxide synthase function in aorta and tail artery from 5/6 nephrectomized rats

Frank T. Spradley, John Jason White, William D Paulson, David M. Pollock, Jennifer S. Pollock

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Chronic renal failure (CRF) is associated with hypertension and concomitant endothelial dysfunction, enhanced vasoconstriction, and nitric oxide synthase (NOS) dysfunction. Vascular function in patients is assessed in peripheral extremity arteries like the finger arteries, whereas animal studies often use the centrally located aorta. Therefore, we examined whether peripheral tail artery and aortic NOS function are differentially regulated by blood pressure in rats with CRF. Using wire myography, arterial function was assessed in 16-weekold Sprague-Dawley rats that were subjected to 5/6 nephrectomy (Nx; arterial ligation model) 8 weeks earlier or non-Nx (control) rats. In aortas from Nx rats, endothelial-dependent vasorelaxation response to acetylcholine (ACh) was blunted and there was enhancement of phenylephrine (PE)-mediated vasoconstriction. Inversely, tail arteries from Nx rats had no change in endothelial function and reduced response to PE. Studies where arterial segments were incubated with the nonspecific NOS inhibitor, L-NAME, showed that Nx reduced NOS function in the aorta but increased NOS function in tail artery for both ACh and PE responses. Furthermore, the observed alterations in NOS function in both aorta and tail artery were abolished when mean arterial blood pressure, as assessed by telemetry, was maintained at normal levels in the 5/6 Nx rats using triple therapy: hydralazine (30 mg/kg per day), hydrochlorothiazide (10 mg/kg per day), and reserpine (0.5 mg/kg per day). In conclusion, differential changes of NOS function in central versus peripheral arteries in CRF are dependent upon hypertension.

Original languageEnglish (US)
Article numbere00145
Pages (from-to)1-10
Number of pages10
JournalPhysiological reports
Volume1
Issue number6
DOIs
StatePublished - Jan 1 2013

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Nitric Oxide Synthase
Aorta
Tail
Arteries
Phenylephrine
Chronic Kidney Failure
Vasoconstriction
Acetylcholine
Arterial Pressure
Myography
Hypertension
Hydralazine
Telemetry
Hydrochlorothiazide
Reserpine
NG-Nitroarginine Methyl Ester
Nephrectomy
Vasodilation
Fingers
Ligation

Keywords

  • Aorta
  • Hypertension
  • L-NAME
  • NOS
  • Nephrectomy
  • Tail artery
  • Vascular reactivity

ASJC Scopus subject areas

  • Physiology
  • Physiology (medical)

Cite this

Differential regulation of nitric oxide synthase function in aorta and tail artery from 5/6 nephrectomized rats. / Spradley, Frank T.; White, John Jason; Paulson, William D; Pollock, David M.; Pollock, Jennifer S.

In: Physiological reports, Vol. 1, No. 6, e00145, 01.01.2013, p. 1-10.

Research output: Contribution to journalArticle

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