(Circulation. 2002;106:913.)
© 2002 American Heart Association, Inc.
Clinical Investigation and Reports |
From the Division of Cardiac Surgery (S.V., C.-H.W., S.-H.L., P.W.M.F., M.V.B., B.D., R.D.W., R.-K.L., D.A.G.M.), Toronto General Hospital, University of Toronto, Toronto, Canada; Division of Neurosurgery (A.S.D), University of Virginia, Charlottesville; and the Division of Cardiology (D.J.S.), St Michaels Hospital, University of Toronto, Toronto, Canada.
Correspondence to Subodh Verma, MD, PhD, Division of Cardiac Surgery, 14 EN-215, 200 Elizabeth St, Toronto General Hospital, Toronto, ON, Canada M5G 2C4. (e-mail subodh.verma{at}sympatico.ca); or Donald A.G. Mickle, MD, University of Toronto, Toronto, Canada.
Background Given the central importance of nitric oxide (NO) in the development and clinical course of cardiovascular diseases, we sought to determine whether the powerful predictive value of C-reactive protein (CRP) might be explained through an effect on NO production.
Methods and Results Endothelial cells (ECs) were incubated with recombinant CRP (0 to 100 µg/mL, 24 hours), and NO and cyclic guanosine monophosphate (cGMP) production was assessed. The effects of CRP on endothelial NO synthase (eNOS) protein, mRNA expression, and mRNA stability were also examined. In a separate study, the effects of CRP (25 µg/mL) on EC cell survival, apoptosis, and in vitro angiogenesis were evaluated. Incubation of ECs with CRP resulted in a significant inhibition of basal and stimulated NO release, with concomitant reductions in cGMP production. CRP caused a marked downregulation of eNOS mRNA and protein expression. Actinomycin D studies suggested that eNOS downregulation was related to decreased mRNA stability. In conjunction with a decrease in NO production, CRP inhibited both basal and vascular endothelial growth factorstimulated angiogenesis as assessed by EC migration and capillary-like tube formation. CRP did not induce EC survival but did, however, promote apoptosis in a NO-dependent fashion.
Conclusions CRP, at concentrations known to predict adverse vascular events, directly quenches the production of the NO, in part, through posttranscriptional effect on eNOS mRNA stability. Diminished NO bioactivity, in turn, inhibits angiogenesis, an important compensatory mechanism in chronic ischemia. Through decreasing NO synthesis, CRP may facilitate the development of diverse cardiovascular diseases. Risk reduction strategies designed to lower plasma CRP may be effective by improving NO bioavailability.
Key Words: angiogenesis nitric oxide interleukins protein, C-reactive cells
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