Elevated vascular reactivity in the timolol-treated spontaneously hypertensive rat

M. T. Goldberg, Christopher Triggle

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8 Citations (Scopus)


Spontaneously hypertensive rats (SHR) treated in utero with a low dose, and from weaning with 6 mg/kg/day of oral timolol, a noncardioselective β-adrenergic blocker, did not develop hypertension. Isolated aortic rings from these animals showed increased reactivity to raised extracellular K+, when compared with tissues from timolol-treated Kyoto-Wistar (WKY) control rats. The normotensive SHR aorta also showed significant responsiveness to H+ and to high Ca2+ concentrations without previously depolarizing the tissue with high K+. These observations suggest that the increased reactivity seen in vascular smooth muscle from this animal does not develop secondary to elevated peripheral resistance and subsequent hypertrophy, and that the initiation of hypertension in this animal may be related to a membrane defect and/or cellular defect which results in a facilitation of Ca2+ availability for the contractile proteins of the SHR vascular smooth muscle cell.

Original languageEnglish
Pages (from-to)1072-1075
Number of pages4
JournalCanadian Journal of Physiology and Pharmacology
Issue number6
Publication statusPublished - 1978
Externally publishedYes


ASJC Scopus subject areas

  • Physiology
  • Pharmacology

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