Effect of antihypertensive therapy on a vascular change in genetically hypertensive rats

Cathy A. Bruner, R Clinton Webb

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Isolated tail arteries from stroke-prone spontaneously hypertensive rats (SHRSP), but not normotensive Wistar-Kyoto (WKY) rats, exhibit oscillatory contractions in response to norepinephrine. To establish whether this vascular abnormality is secondary to elevated arterial pressure, SHRSP and WKY were treated with hydralazine and hydrochlorothiazide from weaning to 4 months of age. Hydralazine and hydrochlorothiazide treatment significantly attenuated hypertension development in SHRSP (systolic blood pressure: control SHRSP = 219 ± 9 mmHg; treated SHRSP = 143 ± 5 mmHg at 15 weeks of age). Helically-cut tail artery strips from all rats were mounted in tissue baths for isometric force recording and exposed to norepinephrine (6×10-10 - 6×10-6M) for 20 min at each concentration. Oscillatory activity was defined as the sum of the magnitudes of all phasic contractions occurring during the final 10 min of NE incubation. There was no significant difference in the magnitude of oscillatory activity between hydralazine/hydro-clorothiazide-treated SHRSP and control SHRSP. From these results we conclude that norepinephrine-induced oscillatory activity in SHRSP is a primary vascular abnormality that is not secondary to high blood pressure.

Original languageEnglish (US)
Pages (from-to)1745-1762
Number of pages18
JournalClinical and Experimental Hypertension
VolumeA9
Issue number12
DOIs
StatePublished - Jan 1 1987
Externally publishedYes

Fingerprint

Hydralazine
Antihypertensive Agents
Blood Vessels
Norepinephrine
Hydrochlorothiazide
Tail
Arteries
Blood Pressure
Hypertension
Inbred WKY Rats
Inbred SHR Rats
Weaning
Baths
Arterial Pressure
Therapeutics
Stroke

Keywords

  • Hydralazine
  • Hydrochlorothiazide
  • Norepinephrine
  • Stroke-prone spontaneously hypertensive rat
  • Tail artery
  • Vascular reactivity

ASJC Scopus subject areas

  • Internal Medicine
  • Physiology

Cite this

Effect of antihypertensive therapy on a vascular change in genetically hypertensive rats. / Bruner, Cathy A.; Webb, R Clinton.

In: Clinical and Experimental Hypertension, Vol. A9, No. 12, 01.01.1987, p. 1745-1762.

Research output: Contribution to journalArticle

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