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(Circulation. 2003;108:1432.)
© 2003 American Heart Association, Inc.
Clinical Investigation and Reports |
From the Donald W. Reynolds Cardiovascular Research Center (M.M.C., E.A.A., A.D., R.T., B.F., E.Y., J.Y.K., M.F., R.R., F.L.J., P.S.T., T.Q.), Division of Cardiovascular Medicine, Falk CVRC, Stanford University, Stanford, Calif; Agilent Technologies (D.X.F.D., A.T., A.B.-D., L.B., Z.Y.), Palo Alto, Calif; and Division of Cardiovascular and Medical Sciences (T.M., H.D.), University of Glasgow, Scotland.
Correspondence to Thomas Quertermous, Donald W. Reynolds Cardiovascular Research Center, Division of Cardiovascular Medicine, Falk CVRC, Stanford University, 300 Pasteur Dr, Stanford, CA 94305. E-mail tomq1{at}stanford.edu
Received July 10, 2003; revision received August 1, 2003; accepted August 4, 2003.
Background Apelin is among the most potent stimulators of cardiac contractility known. However, no physiological or pathological role for apelinangiotensin receptor-like 1 (APJ) signaling has ever been described.
Methods and Results We performed transcriptional profiling using a spotted cDNA microarray with 12 814 unique clones on paired samples of left ventricle obtained before and after placement of a left ventricular assist device in 11 patients. The significance analysis of microarrays and a novel rank consistency score designed to exploit the paired structure of the data confirmed that natriuretic peptides were among the most significantly downregulated genes after offloading. The most significantly upregulated gene was the G-proteincoupled receptor APJ, the specific receptor for apelin. We demonstrate here using immunoassay and immunohistochemical techniques that apelin is localized primarily in the endothelium of the coronary arteries and is found at a higher concentration in cardiac tissue after mechanical offloading. These findings imply an important paracrine signaling pathway in the heart. We additionally extend the clinical significance of this work by reporting for the first time circulating human apelin levels and demonstrating increases in the plasma level of apelin in patients with left ventricular dysfunction.
Conclusions The apelin-APJ signaling pathway emerges as an important novel mediator of cardiovascular control.
Key Words: natriuretic peptides heart failure vasculature
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