Vascular effects of proteinase-activated receptor 2 agonist peptide

Kjell Emilsson, Claes R Wahlestedt, Miao Kun Sun, Sverker Nystedt, Christer Owman, Johan Sundelin

Research output: Contribution to journalArticle

63 Citations (Scopus)

Abstract

Proteinase-activated receptor 2 (PAR-2) is a G protein-coupled receptor related to the thrombin receptor. PAR-2 can be activated by trypsin and by synthetic peptides corresponding to the new amino terminus generated by activating proteolytic cleavage. We show in this report that intravenous injection of PAR-2 agonist peptides has dramatic effects on arterial blood pressure in anesthetized rats. The peptide SLIGRLETQPPI, at 150 nmol/kg, transiently decreased the mean arterial pressure from 104 to 60 mm Hg. The hypotensive response was dose-dependent, and was not secondary to effects on central vasoregulatory systems, heart rate, or the kidneys. A nitric oxide synthase inhibitor attenuated the hypotensive response induced by the PAR-2 agonist peptide. Further experiments in vitro, on preparations of rat femoral artery and vein, showed that PAR-2 agonist peptide elicited a dose-dependent relaxation of both types of vessel. Removal of the endothelium abolished the agonist peptide-induced relaxation. Our results demonstrate that activation of PAR-2 can modulate vascular tone, and that this response was an effect mediated at least partly by nitric oxide. The effect on blood vessels further suggests that the physiological activator of this proteolytically activated receptor is an enzyme present and active in the blood, possibly after a vascular injury.

Original languageEnglish
Pages (from-to)267-272
Number of pages6
JournalJournal of Vascular Research
Volume34
Issue number4
StatePublished - Jul 1 1997
Externally publishedYes

Fingerprint

PAR-2 Receptor
Blood Vessels
Peptides
Arterial Pressure
Thrombin Receptors
Femoral Vein
Vascular System Injuries
Femoral Artery
G-Protein-Coupled Receptors
Nitric Oxide Synthase
Intravenous Injections
Trypsin
Endothelium
Nitric Oxide
Heart Rate
Kidney
Enzymes

Keywords

  • Hypotension
  • Nitric oxide
  • Proteinase-activated receptor 2
  • Vascular endothelium
  • Vasodilation

ASJC Scopus subject areas

  • Physiology

Cite this

Emilsson, K., Wahlestedt, C. R., Sun, M. K., Nystedt, S., Owman, C., & Sundelin, J. (1997). Vascular effects of proteinase-activated receptor 2 agonist peptide. Journal of Vascular Research, 34(4), 267-272.

Vascular effects of proteinase-activated receptor 2 agonist peptide. / Emilsson, Kjell; Wahlestedt, Claes R; Sun, Miao Kun; Nystedt, Sverker; Owman, Christer; Sundelin, Johan.

In: Journal of Vascular Research, Vol. 34, No. 4, 01.07.1997, p. 267-272.

Research output: Contribution to journalArticle

Emilsson, K, Wahlestedt, CR, Sun, MK, Nystedt, S, Owman, C & Sundelin, J 1997, 'Vascular effects of proteinase-activated receptor 2 agonist peptide', Journal of Vascular Research, vol. 34, no. 4, pp. 267-272.
Emilsson K, Wahlestedt CR, Sun MK, Nystedt S, Owman C, Sundelin J. Vascular effects of proteinase-activated receptor 2 agonist peptide. Journal of Vascular Research. 1997 Jul 1;34(4):267-272.
Emilsson, Kjell ; Wahlestedt, Claes R ; Sun, Miao Kun ; Nystedt, Sverker ; Owman, Christer ; Sundelin, Johan. / Vascular effects of proteinase-activated receptor 2 agonist peptide. In: Journal of Vascular Research. 1997 ; Vol. 34, No. 4. pp. 267-272.
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