A Peptide Analogue of Thrombin Receptor–Activating Peptide Inhibits Thrombin and Thrombin-Receptor-Activating Peptide–Induced Vascular Smooth Muscle Cell Proliferation
| Autor: | Rajbabu Pakala, Chyou T. Liang, Claude R. Benedict |
|---|---|
| Rok vydání: | 2001 |
| Předmět: |
Vascular smooth muscle
Cell Count Peptide Biology Thrombomodulin Hemostatics Muscle Smooth Vascular Thrombin Thrombin receptor medicine Humans Receptor Cell Line Transformed Pharmacology chemistry.chemical_classification Ligand (biochemistry) Peptide Fragments Cell biology chemistry Biochemistry Mechanism of action Receptors Thrombin medicine.symptom Cardiology and Cardiovascular Medicine Cell Division medicine.drug |
| Zdroj: | Journal of Cardiovascular Pharmacology. 37:619-629 |
| ISSN: | 0160-2446 |
| DOI: | 10.1097/00005344-200105000-00013 |
| Popis: | 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 NH 2 -terminus that can act as a tethered ligand to activate the thrombin receptor. Peptides derived from the new NH 2 -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 ( 3 H)-thymidine incorporation and has no effect on platelet-derived growth factor and serum-induced smooth muscle cell proliferation. The inhibitory effect of this peptide is dependent on the concentration of the antagonist used and length of preincubation time. The possible mechanism by which this peptide exerts its inhibitory effect may by desensitizing the thrombin receptor. The results of the present study suggest that apart from being antithrombotic, tethered ligand antagonist peptides can also act as antiatherosclerotic or antirestenotic agents. |
| Databáze: | OpenAIRE |
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