Lovastatin induces the expression of bradykinin type 2 receptors in cultured human coronary artery endothelial cells
pmid: 17900611
Lovastatin induces the expression of bradykinin type 2 receptors in cultured human coronary artery endothelial cells
Cardioprotective bradykinin type-2 receptors (BK-2Rs) are downregulated in the myocardial endothelium of both human and rat failing hearts. Statins are cardioprotective drugs that reduce the level of plasma cholesterol but also exert cholesterol-independent pleiotropic effects. Here we examined the effect of lovastatin on BK-2R expression in cultured human coronary artery endothelial cells. The effect of lovastatin on the expression of BK receptors in human coronary artery endothelial cells (HCAECs) was examined by real-time PCR, Western blot analysis and immunocytochemistry. Lovastatin induced a time- and concentration-dependent increase in both BK-2R and BK-1R mRNA expression in the cultured HCAECs. Also, the number of functional BK-2Rs capable of inducing BK-mediated NO production and cGMP signaling was increased in the lovastatin-treated HCAECs. Mevalonate, the direct metabolite of HMG-CoA reductase, reversed the effect of lovastatin. Furthermore, lovastatin inhibited Rho activation and a selective inhibitor of Rho-associated kinases, Y-27632, induced a similar increase in BK-2R expression as lovastatin. In contrast, a specific inhibitor of COX-2, NS398, significantly inhibited the lovastatin-induced expression of BK-2Rs. Here we show for the first time that lovastatin induces the expression of BK-2Rs in cultured human coronary artery endothelial cells through a novel cholesterol-independent pleiotropic mechanism that involves RhoA kinase inhibition and COX-2 activation. Thus, reported beneficial effects of statins in cardiovascular diseases may be partly mediated by an increased expression of cardioprotective BK-2Rs in the endothelial cells of the coronary tree. Moreover, the use of COX-2 inhibitors may affect the level of endothelial BK-2Rs in a negative fashion.
- Helsinki University Hospital Finland
- Wihuri Research Institute Finland
Receptor, Bradykinin B2, Nitric Oxide, Coronary Vessels, Polymerase Chain Reaction, Gene Expression Regulation, Humans, Endothelium, Vascular, Lovastatin, Cyclic GMP, Cell Division, Cells, Cultured
Receptor, Bradykinin B2, Nitric Oxide, Coronary Vessels, Polymerase Chain Reaction, Gene Expression Regulation, Humans, Endothelium, Vascular, Lovastatin, Cyclic GMP, Cell Division, Cells, Cultured
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