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. 1995 Apr;114(8):1680–1686. doi: 10.1111/j.1476-5381.1995.tb14957.x

Vascular actions of thrombin receptor-derived polypeptides: structure-activity profiles for contractile and relaxant effects in rat aorta.

A A Laniyonu 1, M D Hollenberg 1
PMCID: PMC1510399  PMID: 7541284

Abstract

1. Using endothelium-denuded and intact rat aortic rings, we have determined the contractile and relaxant structure-activity profile for a series of thrombin receptor-derived polypeptides (TRPs) based on the human and rat receptor sequences: SFLLR (P5), SFLLR-NH2 (P5-NH2) SFFLR (Rat P5), SFFLR-NH2 (Rat P5-NH2), SFLLRNP (P7), SFLLRNP-NH2 (P7-NH2), SFFLRNP (Rat P7), SFFLRNP-NH2 (Rat P7-NH2), and SFLLRNPNDKYEPF (P14). 2. A contractile response to thrombin and the TRPs in the endothelium-denuded aortic tissue was minimal or absent in preparations obtained from animal weighing less than 180 g (< 6 weeks of age), but increased with animal size, plateauing in tissues derived from animals weighing between 320 and 420 g (about 9 to 14 weeks of age). In contrast, the contractile responses to KCl and noradrenaline did not differ in the tissues and relaxant responses to the TRPs in endothelium-intact aortic preparations were comparable for tissues obtained from either young (< or = 180 g) or older (> or = 320 g) animals. 3. The contractile response of the endothelium-denuded preparation to thrombin and the TRPs showed marked cross-desensitization: the relaxation response of the intact rings did not desensitize to the TRPs. 4. The relative potencies for the TRPs in the aortic contraction assay were comparable to those for the relaxation assay, but were distinct from the relative potencies we measured previously in a rat gastric longitudinal muscle contraction assay. Further, P5 behaved as a partial agonist in the aortic contraction assay, whereas it had been observed to be a full agonist in the gastric contraction assay.(ABSTRACT TRUNCATED AT 250 WORDS)

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Selected References

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