Nitric Oxide May Prevent Hypertension Early in Diabetes by Counteracting Renal Actions of Superoxide

Michael W Brands, Tracy D. Bell, Bradford Gibson

Research output: Contribution to journalArticle

47 Citations (Scopus)

Abstract

The dependence of blood pressure on a balance between superoxide and nitric oxide may be amplified in diabetes. We have shown that the first occurrence of sustained hyperglycemia in type I diabetes causes hypertension when induced in rats that have had nitric oxide synthesis blocked chronically (L-NAME, 10 μg/kg per minute IV). This study used tempol (18 μmol/kg per hour IV) to test the hypothesis that superoxide mediates that hypertensive response. Induction of diabetes in untreated rats had no significant effect on mean arterial pressure (MAP, measured 18 h/d), and glomerular filtration rate (GFR) increased significantly during the 2 weeks of diabetes. Chronic infusion of L-NAME in a separate group of rats increased baseline MAP from ≈90 mm Hg to a stable level of ≈120 mm Hg after 6 days of infusion, and induction of diabetes (streptozotocin, 40 mg/kg IV) in those rats caused a rapid, progressive increase in MAP that averaged 156±5 mm Hg by day 14 of diabetes that was associated with a decrease in GFR and 4-fold increase in isoprostane excretion. Tempol infusion was begun on day 2 of diabetes in a subgroup of those rats, and the progressive hypertensive response was prevented, with MAP averaging 134±10 10 mm Hg by day 14. In addition, the normal renal hyperfiltration response was restored by tempol and the increase in isoprostane did not occur. Thus, the hypertension and decrease in GFR caused by onset of diabetes in rats without a functioning nitric oxide system was prevented by chronic administration of the superoxide dismutase mimetic tempol.

Original languageEnglish (US)
Pages (from-to)57-63
Number of pages7
JournalHypertension
Volume43
Issue number1
DOIs
StatePublished - Jan 1 2004

Fingerprint

Superoxides
Nitric Oxide
Hypertension
Kidney
Glomerular Filtration Rate
Isoprostanes
NG-Nitroarginine Methyl Ester
Experimental Diabetes Mellitus
Type 1 Diabetes Mellitus
Hyperglycemia
Superoxide Dismutase
Arterial Pressure
Blood Pressure
tempol

Keywords

  • Blood pressure
  • Diabetes mellitus
  • Glomerular filtration rate
  • L-NAME
  • Nitric oxide

ASJC Scopus subject areas

  • Internal Medicine

Cite this

Nitric Oxide May Prevent Hypertension Early in Diabetes by Counteracting Renal Actions of Superoxide. / Brands, Michael W; Bell, Tracy D.; Gibson, Bradford.

In: Hypertension, Vol. 43, No. 1, 01.01.2004, p. 57-63.

Research output: Contribution to journalArticle

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