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https://hdl.handle.net/2440/9927
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Type: | Journal article |
Title: | Evidence against a major role of angiotensin converting enzyme-related carboxypeptidase (ACE2) in angiotensin peptide metabolism in the human coronary circulation |
Author: | Campbell, D. Zeitz, C. Esler, M. Horowitz, J. |
Citation: | Journal of Hypertension, 2004; 22(10):1971-1976 |
Publisher: | Lippincott Williams & Wilkins |
Issue Date: | 2004 |
ISSN: | 0263-6352 1473-5598 |
Statement of Responsibility: | Duncan J Campbell; Christopher J Zeitz; Murray D Esler; John D Horowitz |
Abstract: | <h4>Objective</h4>To investigate the role of angiotensin-converting enzyme-related carboxypeptidase (ACE2) in angiotensin peptide metabolism in the human coronary circulation.<h4>Methods</h4>Angiotensin I and angiotensin II, and their respective carboxypeptidase metabolites, angiotensin-(1-9) and angiotensin-(1-7), were measured in arterial and coronary sinus blood of heart failure subjects receiving angiotensin-converting enzyme (ACE) inhibitor therapy and in normal subjects not receiving ACE inhibitor therapy. In addition, angiotensin I, angiotensin II and angiotensin-(1-7) were measured in arterial and coronary sinus blood of subjects with coronary artery disease before, and at 2, 5 and 10 min after, intravenous administration of ACE inhibitor.<h4>Results</h4>In comparison with normal subjects, heart failure subjects receiving ACE inhibitor therapy had a greater than 40-fold increase in angiotensin I levels, but angiotensin-(1-9) levels were low (1-2 fmol/ml), and similar to those of normal subjects. Moreover, angiotensin-(1-7) levels increased in parallel with angiotensin I levels and the angiotensin-(1-7)/angiotensin II ratio increased by 7.5-fold in coronary sinus blood. Intravenous administration of ACE inhibitor to subjects with coronary artery disease rapidly decreased angiotensin II levels by 54-58% and increased angiotensin I levels by 2.4- to 2.8-fold, but did not alter angiotensin-(1-7) levels or net angiotensin-(1-7) production across the myocardial vascular bed.<h4>Conclusions</h4>The failure of angiotensin-(1-9) levels to increase in response to increased angiotensin I levels indicated little role for ACE2 in angiotensin I metabolism. Additionally, the levels of angiotensin-(1-7) were more linked to those of angiotensin I than angiotensin II, consistent with its formation by endopeptidase-mediated metabolism of angiotensin I, rather than by ACE2-mediated metabolism of angiotensin II. |
Keywords: | Humans Cardiac Output, Low Carboxypeptidases Peptidyl-Dipeptidase A Angiotensins Angiotensin I Angiotensin II Peptide Fragments Angiotensin-Converting Enzyme Inhibitors Drug Administration Schedule Case-Control Studies Coronary Circulation Adult Middle Aged Female Male |
Description: | © 2004 Lippincott Williams & Wilkins, Inc. |
DOI: | 10.1097/00004872-200410000-00020 |
Description (link): | http://journals.lww.com/jhypertension/pages/articleviewer.aspx?year=2004&issue=10000&article=00020&type=abstract |
Published version: | http://dx.doi.org/10.1097/00004872-200410000-00020 |
Appears in Collections: | Aurora harvest Medicine publications |
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