Caffeine enhances endothelial repair by an AMPK-dependent mechanism.
ARTERIOSCLEROSIS THROMBOSIS AND VASCULAR BIOLOGY(2009)
摘要
Objective-Migratory capacity of endothelial progenitor cells (EPCs) and mature endothelial cells (ECs) is a key prerequisite for endothelial repair after denuding injury or endothelial damage. Methods and Results-We demonstrate that caffeine in physiologically relevant concentrations (50 to 100 mu mol/L) induces migration of human EPCs as well as mature ECs. In patients with coronary artery disease (CAD), caffeinated coffee increased caffeine serum concentration from 2 mu mol/L to 23 mu mol/L, coinciding with a significant increase in migratory activity of patient-derived EPCs. Decaffeinated coffee neither affected caffeine serum levels nor migratory capacity of EPCs. Treatment with caffeine for 7 to 10 days in a mouse-model improved endothelial repair after denudation of the carotid artery. The enhancement of reendothelialization by caffeine was significantly reduced in AMPK knockout mice compared to wild-type animals. Transplantation of wild-type and AMPK(-/-) bone marrow into wild-type mice revealed no difference in caffeine challenged reendothelialization. ECs which were depleted of mitochondrial DNA did not migrate when challenged with caffeine, suggesting a potential role for mitochondria in caffeine-dependent migration. Conclusion-These results provide evidence that caffeine enhances endothelial cell migration and reendothelialization in part through an AMPK-dependent mechanism, suggesting a beneficial role for caffeine in endothelial repair. (Arterioscler Thromb Vasc Biol. 2008;28:1967-1974)
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关键词
caffeine,reendothelialization,endothelium,AMPK,mitochondria
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