A peptide analogue of thrombin receptor-activating peptide inhibits thrombin and thrombin-receptor-activating peptide-induced vascular smooth muscle cell proliferation

Journal of Cardiovascular Pharmacology
R PakalaC R Benedict

Abstract

The serine protease thrombin, in addition to its pivotal role in the coagulation cascade, plays an important role in the development of atherosclerosis and restenosis by inducing smooth cell proliferation. Thrombin exerts its cellular effects mainly by cleaving its own receptor, leaving a new NH2-terminus that can act as a tethered ligand to activate the thrombin receptor. Peptides derived from the new NH2-terminus are able to fully activate thrombin receptor and mimic cellular effects of thrombin. Peptides with structural similarities to the tethered ligand have been tested for their ability to prevent thrombin- and tethered ligand-induced platelet aggregation and thrombus formation. We synthesized a peptide with multiple alanine substitutions in both critical and noncritical residues of tethered ligand that specifically inhibited platelet aggregation induced by thrombin and thrombin receptor-activating peptide and prevented thrombus formation in a rabbit thrombosis model. In the present study we demonstrate that this peptide inhibited only thrombin- and tethered ligand-induced human vascular smooth muscle cell proliferation as determined by (3H)-thymidine incorporation and has no effect on platelet-derived growth factor and s...Continue Reading

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Citations

Mar 4, 2008·Yakugaku zasshi : Journal of the Pharmaceutical Society of Japan·Akiko UranoToshiyuki Kaji
May 3, 2011·PloS One·Corinne SchaerNicola L Harris
Jun 8, 2017·Frontiers in Pharmacology·Jialiang GaoJie Wang

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