Upregulated TRPC1 Channel in Vascular Injury In Vivo and Its Role in Human Neointimal Hyperplasia

• Published in: Circulation research Vol. 98; no. 4; pp. 557 - 563
• Main Authors: Kumar, B, Dreja, K, Shah, S S, Cheong, A, Xu, S -Z, Sukumar, P, Naylor, J, Forte, A, Cipollaro, M, McHugh, D, Kingston, P A, Heagerty, A M, Munsch, C M, Bergdahl, A, Hultgårdh-Nilsson, A, Gomez, M F, Porter, K E, Hellstrand, P, Beech, D J
• Format: Journal Article
• Language: English
• Published: Hagerstown, MD American Heart Association, Inc 03.03.2006; Lippincott
• Subjects: Animals; Biological and medical sciences; Calcium - metabolism; calcium channel; Calcium Channel Blockers - pharmacology; Cardiac and Cardiovascular Systems; Cell Proliferation - drug effects; Cells, Cultured; Clinical Medicine; Drosophila; Fundamental and applied biological sciences. Psychology; Humans; Hyperplasia; Kardiologi; Klinisk medicin; Male; Medical and Health Sciences; Medicin och hälsovetenskap; Mice; Mice, Inbred C57BL; Muscle, Smooth, Vascular - drug effects; Muscle, Smooth, Vascular - pathology; neointimal hyperplasia; Rats; Rats, Inbred WKY; Saphenous Vein - pathology; Swine; transient receptor potential; TRPC Cation Channels - antagonists & inhibitors; TRPC Cation Channels - genetics; TRPC Cation Channels - physiology; Tunica Intima - pathology; Up-Regulation; Vascular Diseases - drug therapy; Vascular Diseases - metabolism; vascular smooth muscle cells; Vertebrates: cardiovascular system; Human; calcium channel; Calcium; Hyperplasia; Smooth muscle; Ionic channel; Inorganic element; neointimal hyperplasia; Transients; transient receptor potential; In vivo; Vertebrata; Mammalia; Circulatory system; Lesion; vascular smooth muscle cells; Biological receptor
• ISSN: 0009-7330; 1524-4571
• DOI: 10.1161/01.RES.0000204724.29685.db

Occlusive vascular disease is a widespread abnormality leading to lethal or debilitating outcomes such as myocardial infarction and stroke. It is part of atherosclerosis and is evoked by clinical procedures including angioplasty and grafting of saphenous vein in bypass surgery. A causative factor is the switch in smooth muscle cells to an invasive and proliferative mode, leading to neointimal hyperplasia. Here we reveal the importance to this process of TRPC1, a homolog of Drosophila transient receptor potential. Using 2 different in vivo models of vascular injury in rodents we show hyperplasic smooth muscle cells have upregulated TRPC1 associated with enhanced calcium entry and cell cycle activity. Neointimal smooth muscle cells after balloon angioplasty of pig coronary artery also express TRPC1. Furthermore, human vein samples obtained during coronary artery bypass graft surgery commonly exhibit an intimal structure containing smooth muscle cells that expressed more TRPC1 than the medial layer cells. Veins were organ cultured to allow growth of neointimal smooth muscle cells over a 2-week period. To explore the functional relevance of TRPC1, we used a specific E3-targeted antibody to TRPC1 and chemical blocker 2-aminoethoxydiphenyl borate. Both agents significantly reduced neointimal growth in human vein, as well as calcium entry and proliferation of smooth muscle cells in culture. The data suggest upregulated TRPC1 is a general feature of smooth muscle cells in occlusive vascular disease and that TRPC1 inhibitors have potential as protective agents against human vascular failure.