TY - JOUR T1 - 20-HETE inhibition attenuates balloon injury-induced neointima formation and vascular remodeling in rat carotid arteries. JF - Journal of Pharmacology and Experimental Therapeutics JO - J Pharmacol Exp Ther DO - 10.1124/jpet.113.203844 SP - jpet.113.203844 AU - Ludwig D. Orozco AU - Huiling Liu AU - Eddie Perkins AU - Daryl A. Johnson AU - Betty B, Chen AU - Fan Fan AU - Rodney C. Baker AU - Richard J. Roman Y1 - 2013/01/01 UR - http://jpet.aspetjournals.org/content/early/2013/05/08/jpet.113.203844.abstract N2 - 20-Hydroxyeicosatetraenoic acid (20-HETE) contributes to the migration and proliferation of vascular smooth muscle cells (VSMC) in vitro, but there are few studies that address its effects on vascular remodeling in vivo. The present study determined whether inhibition of 20-HETE production attenuates intimal hyperplasia (IH) and vascular remodeling following balloon-injury (BI). Sprague Dawley rats (SD) underwent BI of the common carotid artery and were treated with vehicle, 1-Aminobenzotriazole (ABT, 50 mg/kg intraperitoneal, once daily), or HET0016 (2 mg/kg, subcutaneous injection, twice daily) for 14 days. Fourteen days after BI and treatment, the animals underwent carotid angiography and the arteries were harvested for morphometric, enzymatic and immunohistochemical analysis. There was a 96% reduction of angiographic stenosis in the rats treated with 1-ABT. There was a 61% and 66% reduction of the intima/media area ratios in the 1-ABT and HET0016 treated rats compared with the vehicle-treated group. 20-HETE levels were elevated in BI carotid arteries and the levels were markedly suppressed in the 1-ABT and HET0016 treated groups (p<0.001). Immunostaining indicated that the expression of CYP4A enzyme was markedly increased in the neointima of BI arteries and it colocalized with the expression of smooth muscle-specific actin, indicating increased proliferation of VSMC. An increase in the expression of CYP4A and the production of 20-HETE contributes to neointimal growth in BI rat carotid arteries. Systemic administration 1-ABT or HET0016 prevents the increase in 20-HETE levels and attenuates VSMC migration and proliferation resulting in a marked reduction in IH and vascular remodeling following endothelial injury. ER -