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(Circulation. 2002;105:3017.)
© 2002 American Heart Association, Inc.
Basic Science Reports |

From the Department of Medicine (Cardiovascular Research), St Elizabeths Medical Center, Tufts University School of Medicine, Boston, Mass.
Correspondence to Takayuki Asahara, MD, PhD, St Elizabeths Medical Center, 736 Cambridge St, Boston, MA 02135. E-mail asa777@ aol.com
Background Primary and secondary prevention trials suggest that statins possess favorable effects independent of cholesterol reduction. We investigated whether statin therapy may also accelerate reendothelialization after carotid balloon injury.
Methods and Results Simvastatin treatment in 34 male Sprague-Dawley rats accelerated reendothelialization of the balloon-injured arterial segments (reendothelialized area at 2 weeks, 12.3±1.8 versus 5.4±1.1 mm2, P< 0.01) and resulted in a dose-dependent (0.2 or 1 mg/kg IP) significant reduction in neointimal thickening at 2, 3, and 4 weeks compared with saline-injected controls (n=18). To elucidate the mechanism, we investigated the contribution of bone marrowderived endothelial progenitor cells (EPCs) by bone marrow transplantation from Tie2/lacZ mice to background mice or nude rats. X-gal staining of mouse carotid artery specimens revealed a 2.9-fold increase in the number of ß-galpositive cells per square millimeter appearing on the carotid artery luminal surface at 2 weeks, and double-fluorescence immunohistochemistry disclosed a significant 5-fold increase in the number of double-positive cells (ß-gal, isolectin B4) on the luminal surface in carotid arteries of statin-treated nude rats (20±3 versus 4±1 cells/mm surface length, P<0.005). Statins increased circulating rat EPCs (2.4-fold at 2 weeks and 2.5-fold at 4 weeks, P<0.001) and induced adhesiveness of cultured human EPCs by upregulation of the integrin subunits
5, ß1,
v, and ß5 of human EPCs as shown by reverse transcriptionpolymerase chain reaction and fluorescence-activated cell sorting.
Conclusions These findings establish additional mechanisms by which statins may specifically preempt disordered vascular wall pathology and constitute physiological evidence that EPC mobilization represents a functionally relevant consequence of statin therapy.
Key Words: coronary disease endothelium angiogenesis statins cells
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