Overexpression of the P2Y 2 Purinoceptor in Intimal Lesions of the Rat Aorta
- 1 December 1997
- journal article
- research article
- Published by Ovid Technologies (Wolters Kluwer Health) in Arteriosclerosis, Thrombosis, and Vascular Biology
- Vol. 17 (12), 3602-3610
- https://doi.org/10.1161/01.atv.17.12.3602
Abstract
Extracellular nucleotides, particularly ATP, are involved in the modulation of arterial vasomotricity via P2 purinoceptors present on smooth muscle and endothelial cells. These nucleotides could also be implicated in the smooth muscle cell hyperplasia observed in intimal lesions. In this study, we tried to define the potential role of the P2Y 2 (P 2u ) purinoceptor by studying its expression in normal and balloon-injured rat aortas. The cloning of a rat P2Y 2 cDNA from a rat smooth muscle cell cDNA library made it possible to study P2Y 2 expression both by Northern blot and in situ hybridization. Northern blot experiments indicated that P2Y 2 mRNA was present in rat medial aortic smooth muscle and in cultured rat aortic smooth muscle cells. In situ hybridization indicated that P2Y 2 mRNA was present in endothelial cells of the intima and in some smooth muscle cells scattered throughout the media of adult rat aortas, while almost all medial smooth muscle cells of rat embryo aorta expressed this receptor. In contrast with adult aortic media, the majority of neointimal smooth muscle cells found in aortic intimal lesions either 8 or 20 days after balloon injury were positive for P2Y 2 mRNA. Moreover, a subpopulation of neointimal cells localized at the luminal surface could be identified by a higher P2Y 2 expression than the underlying neointimal smooth muscle cells. These data showing a strong expression of the P2Y 2 purinoceptor in the neointima of injured arteries suggest that extracellular nucleotides may be involved, via this receptor, in the intimal hyperplasia and/or chronic constriction observed at the lesion site, and consequently in the restenotic process.Keywords
This publication has 26 references indexed in Scilit:
- P2-Purinergic Receptors: Subtype-Associated Signaling Responses and StructureAnnual Review of Pharmacology and Toxicology, 1995
- Characterisation of an ATP receptor mediating mitogenesis in vascular smooth muscle cellsEuropean Journal of Pharmacology: Molecular Pharmacology, 1995
- Synergistic effect of acute hypoxia on flow-induced release of ATP from cultured endothelial cellsCellular and Molecular Life Sciences, 1995
- The pathogenesis of atherosclerosis: a perspective for the 1990sNature, 1993
- Endothelin-1 and Endothelin Receptor mRNA Expression in Normal and Atherosclerotic Human ArteriesBiochemical and Biophysical Research Communications, 1993
- Recent developments in the classification and functional significance of receptors for ATP and UTP, evidence for nucleotide receptorsLife Sciences, 1992
- Extracellular ATP and ADP stimulate proliferation of porcine aortic smooth muscle cellsJournal of Cellular Physiology, 1992
- Balloon angioplasty enhances the expression of angiotensin II AT1 receptors in neointima of rat aorta.JCI Insight, 1992
- Induction of cell cycle‐dependent genes during cell cycle progression of arterial smooth muscle cells in cultureJournal of Cellular Physiology, 1991
- PDGF ligand and receptor gene expression during repair of arterial injury.The Journal of cell biology, 1990