Circulation. 2003;107:1783-1790
Published online before print March 17, 2003, doi: 10.1161/01.CIR.0000061916.95736.E5
Published online before print March 17, 2003, doi: 10.1161/01.CIR.0000061916.95736.E5
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(Circulation. 2003;107:1783.)
© 2003 American Heart Association, Inc.
Basic Science Reports |
C-Reactive Protein Upregulates Angiotensin Type 1 Receptors in Vascular Smooth Muscle
From the Division of Cardiac Surgery, University of Toronto, Toronto, Ontario, Canada, and the Division of Neurosurgery (A.S.D.), UVA Department of Neurosurgery, Charlottesville, Va.
Correspondence to Subodh Verma, MD, PhD, Division of Cardiac Surgery, Toronto General Hospital, 14EN-215, 200 Elizabeth St, Toronto, Ontario, Canada M5G 2C4. E-mail Subodh.Verma{at}Sympatico.ca
Background— Accumulating evidence suggests that C-reactive protein (CRP), in addition to predicting vascular disease, may actively facilitate lesion formation by inciting endothelial cell activation. Given the central importance of angiotensin type 1 receptor (AT1-R) in the pathogenesis of atherosclerosis, we examined the effects of CRP on AT1-R expression and kinetics in vascular smooth muscle (VSM) cells. In addition, the effects of CRP on VSM migration, proliferation, and reactive oxygen species (ROS) production were evaluated in the presence and absence of the angiotensin receptor blocker, losartan. Lastly, the effects of CRP (and losartan) on neointimal formation were examined in vivo in a rat carotid angioplasty model.
Methods and Results— The effects of human recombinant CRP (0 to 100 µg/mL) on AT1-R transcript, mRNA stability, and protein expression were studied in cultured human VSM cells. AT1-R binding was assessed with 125I-labeled angiotensin II (Ang II). VSM migration was assessed with wound cell migration assays, whereas VSM proliferation was determined with [3H]-incorporation and cell number. The effects of CRP (and losartan) on Ang II–induced ROS production were evaluated by 2',7'-dichlorofluorescein fluorescence. Lastly, the effects of CRP (and losartan) on neointimal formation, VSM cell migration, proliferation, and matrix formation were studied in vivo in a rat carotid artery balloon injury model. CRP markedly upregulated AT1-R mRNA and protein expression and increased AT1-R number on VSM cells. CRP promoted VSM migration and proliferation in vitro and increased ROS production. Furthermore, CRP potentiated the effects of Ang II on these processes. In the rat carotid artery angioplasty model, exposure to CRP resulted in an increase in cell migration and proliferation, collagen and elastin content, and AT1-R expression, as well as an increase in neointimal formation; these effects were attenuated by losartan.
Conclusions— CRP, at concentrations known to predict cardiovascular events, upregulates AT1-R–mediated atherosclerotic events in vascular smooth muscle in vitro and in vivo. These data lend credence to the notion that CRP functions as a proatherosclerotic factor as well as a powerful risk marker.
Key Words: C-reactive protein • atherosclerosis • smooth muscle • angiotensin
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E. L. Schiffrin and R. M. Touyz From bedside to bench to bedside: role of renin-angiotensin-aldosterone system in remodeling of resistance arteries in hypertension Am J Physiol Heart Circ Physiol, August 1, 2004; 287(2): H435 - H446. [Full Text] [PDF]
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K. K. Koh, J. W. Son, J. Y. Ahn, D. S. Kim, D. K. Jin, H. S. Kim, S. H. Han, Y.-H. Seo, W.-J. Chung, W. C. Kang, et al. Simvastatin Combined With Ramipril Treatment in Hypercholesterolemic Patients Hypertension, August 1, 2004; 44(2): 180 - 185. [Abstract] [Full Text] [PDF]
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S. Fichtlscherer, S. Breuer, C. Heeschen, S. Dimmeler, and A. M. Zeiher Interleukin-10 serum levels and systemic endothelial vasoreactivity in patients with coronary artery disease J. Am. Coll. Cardiol., July 7, 2004; 44(1): 44 - 49. [Abstract] [Full Text] [PDF]
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K. K. Koh and I. Sakuma Should Progestins Be Blamed for the Failure of Hormone Replacement Therapy to Reduce Cardiovascular Events in Randomized Controlled Trials? Arterioscler Thromb Vasc Biol, July 1, 2004; 24(7): 1171 - 1179. [Abstract] [Full Text] [PDF]
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I. Jialal, S. Devaraj, and S. K. Venugopal C-Reactive Protein: Risk Marker or Mediator in Atherothrombosis? Hypertension, July 1, 2004; 44(1): 6 - 11. [Abstract] [Full Text] [PDF]
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K. Amann, M.-L. Gross, and E. Ritz Pathophysiology Underlying Accelerated Atherogenesis in Renal Disease: Closing in on the Target J. Am. Soc. Nephrol., June 1, 2004; 15(6): 1664 - 1666. [Full Text] [PDF]
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S. Verma, M. A. Kuliszewski, S.-H. Li, P. E. Szmitko, L. Zucco, C.-H. Wang, M. V. Badiwala, D. A.G. Mickle, R. D. Weisel, P. W.M. Fedak, et al. C-Reactive Protein Attenuates Endothelial Progenitor Cell Survival, Differentiation, and Function: Further Evidence of a Mechanistic Link Between C-Reactive Protein and Cardiovascular Disease Circulation, May 4, 2004; 109(17): 2058 - 2067. [Abstract] [Full Text] [PDF]
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S. Verma, P. E. Szmitko, and E. T.H. Yeh C-Reactive Protein: Structure Affects Function Circulation, April 27, 2004; 109(16): 1914 - 1917. [Full Text] [PDF]
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D. L. Brown, K. K. Desai, B. A. Vakili, C. Nouneh, H.-M. Lee, and L. M. Golub Clinical and Biochemical Results of the Metalloproteinase Inhibition with Subantimicrobial Doses of Doxycycline to Prevent Acute Coronary Syndromes (MIDAS) Pilot Trial Arterioscler Thromb Vasc Biol, April 1, 2004; 24(4): 733 - 738. [Abstract] [Full Text] [PDF]
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N. Daneshtalab, R. Z. Lewanczuk, A. Russell, and F. Jamali Rheumatoid Arthritis Does Not Reduce the Pharmacodynamic Response to Valsartan J. Clin. Pharmacol., March 1, 2004; 44(3): 245 - 252. [Abstract] [Full Text] [PDF]
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S.-H. Li, P. E. Szmitko, R. D. Weisel, C.-H. Wang, P. W.M. Fedak, R.-K. Li, D. A.G. Mickle, and S. Verma C-Reactive Protein Upregulates Complement-Inhibitory Factors in Endothelial Cells Circulation, February 24, 2004; 109(7): 833 - 836. [Abstract] [Full Text] [PDF]
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A. Paul, K. W.S. Ko, L. Li, V. Yechoor, M. A. McCrory, A. J. Szalai, and L. Chan C-Reactive Protein Accelerates the Progression of Atherosclerosis in Apolipoprotein E-Deficient Mice Circulation, February 10, 2004; 109(5): 647 - 655. [Abstract] [Full Text] [PDF]
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G. J. Blake, N. Rifai, J. E. Buring, and P. M Ridker Blood Pressure, C-Reactive Protein, and Risk of Future Cardiovascular Events Circulation, December 16, 2003; 108(24): 2993 - 2999. [Abstract] [Full Text] [PDF]
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 H. D. Sesso, J. E. Buring, N. Rifai, G. J. Blake, J. M. Gaziano, and P. M. Ridker C-Reactive Protein and the Risk of Developing Hypertension JAMA, December 10, 2003; 290(22): 2945 - 2951. [Abstract] [Full Text] [PDF]
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S. Verma, M. V. Badiwala, R. D. Weisel, S.-H. Li, C.-H. Wang, P. W. M. Fedak, R.-K. Li, and D. A. G. Mickle C-reactive protein activates the nuclear factor-{kappa}B signal transduction pathway in saphenous vein endothelial cells: implications for atherosclerosis and restenosis J. Thorac. Cardiovasc. Surg., December 1, 2003; 126(6): 1886 - 1891. [Abstract] [Full Text] [PDF]
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S. Verma and P. E. Szmitko Coxibs and the endothelium J. Am. Coll. Cardiol., November 19, 2003; 42(10): 1754 - 1756. [Full Text] [PDF]
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 G.M. Hirschfield and M.B. Pepys C-reactive protein and cardiovascular disease: new insights from an old molecule QJM, November 1, 2003; 96(11): 793 - 807. [Abstract] [Full Text] [PDF]
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S. Verma, M. R. Buchanan, and T. J. Anderson Endothelial Function Testing as a Biomarker of Vascular Disease Circulation, October 28, 2003; 108(17): 2054 - 2059. [Full Text] [PDF]
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P. E. Szmitko, C.-H. Wang, R. D. Weisel, J. R. de Almeida, T. J. Anderson, and S. Verma New Markers of Inflammation and Endothelial Cell Activation: Part I Circulation, October 21, 2003; 108(16): 1917 - 1923. [Full Text] [PDF]
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M. P.M. de Maat, C. Kluft, J. Gram, and J. Jespersen Angiotensin-Converting Enzyme Inhibitor Trandolapril Does Not Affect C-Reactive Protein Levels in Myocardial Infarction Patients Circulation, October 14, 2003; 108 (15): e113 - e113. [Full Text] [PDF]
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V. Palmieri, R. P. Tracy, M. J. Roman, J. E. Liu, L. G. Best, J. N. Bella, D. C. Robbins, B. V. Howard, and R. B. Devereux Relation of Left Ventricular Hypertrophy to Inflammation and Albuminuria in Adults With Type 2 Diabetes: The Strong Heart Study Diabetes Care, October 1, 2003; 26(10): 2764 - 2769. [Abstract] [Full Text] [PDF]
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K. K. Koh, J. Y. Ahn, D. K. Jin, B.-K. Yoon, H. S. Kim, D. S. Kim, W. C. Kang, S. H. Han, I. S. Choi, and E. K. Shin Significant Differential Effects of Hormone Therapy or Tibolone on Markers of Cardiovascular Disease in Postmenopausal Women: A Randomized, Double-Blind, Placebo-Controlled, Crossover Study Arterioscler Thromb Vasc Biol, October 1, 2003; 23(10): 1889 - 1894. [Abstract] [Full Text] [PDF]
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