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      The Vasorelaxant Action of Parathyroid Hormone Fragments on Isolated Rat Tail Artery

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          Previous studies have demonstrated that parathyroid hormone (PTH) and its 1–34 amino terminal fragment possess a hypotensive action in vivo which appeared to be direct and dose-dependent. However, attempts to demonstrate the phenomenon in isolated vascular tissue have been minimally successful at best. The present study reports that bovine PTH-(1–34) can relax isolated rat tail artery helical strips precontracted by either arginine vasopressin, depolarizing concentrations of potassium chloride, or norepinephrine. The phenomenon occurs in a dose-dependent manner and is not dependent upon the presence of the endothelial lining of the vessels. These studies support the hypothesis that bovine PTH-(l-34) produces a direct vasorelaxant action mainly in small arteries.

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          Author and article information

          J Vasc Res
          Journal of Vascular Research
          S. Karger AG
          23 September 2008
          : 22
          : 2
          : 57-64
          Department of Pharmacology and Therapeutics, Texas Tech University Health Sciences Center, Lubbock, Tex., USA
          158584 Blood Vessels 1985;22:57–64
          © 1985 S. Karger AG, Basel

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          Pages: 8
          Research Paper


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