Hypertension. 2004;43:970-976
Published online before print March 8, 2004, doi: 10.1161/01.HYP.0000124667.34652.1a
Published online before print March 8, 2004, doi: 10.1161/01.HYP.0000124667.34652.1a
(Hypertension. 2004;43:970.)
© 2004 American Heart Association, Inc.
Scientific Contributions |
Upregulation of Angiotensin-Converting Enzyme 2 After Myocardial Infarction by Blockade of Angiotensin II Receptors
From the Hypertension and Vascular Disease Center, Wake Forest University Health Science Center, Winston-Salem, NC.
Correspondence to Carlos M. Ferrario, MD, Hypertension and Vascular Disease Center, Wake Forest University School of Medicine, Medical Center Boulevard, Winston-Salem, NC 27157. E-mail cferrari{at}wfubmc.edu
We investigated in Lewis normotensive rats the effect of coronary artery ligation on the expression of cardiac angiotensin-converting enzymes (ACE and ACE 2) and angiotensin II type-1 receptors (AT1a-R) 28 days after myocardial infarction. Losartan, olmesartan, or the vehicle (isotonic saline) was administered via osmotic minipumps for 28 days after coronary artery ligation or sham operation. Coronary artery ligation caused left ventricular dysfunction and cardiac hypertrophy. These changes were associated with increased plasma concentrations of angiotensin I, angiotensin II, angiotensin-(1–7), and serum aldosterone, and reduced AT1a-R mRNA. Cardiac ACE and ACE 2 mRNAs did not change. Both angiotensin II antagonists attenuated cardiac hypertrophy; olmesartan improved ventricular contractility. Blockade of the AT1a-R was accompanied by a further increase in plasma concentrations of the angiotensins and reduced serum aldosterone levels. Both losartan and olmesartan completely reversed the reduction in cardiac AT1a-R mRNA observed after coronary artery ligation while augmenting ACE 2 mRNA by approximately 3-fold. Coadministration of PD123319 did not abate the increase in ACE 2 mRNA induced by losartan. ACE 2 mRNA correlated significantly with angiotensin II, angiotensin-(1–7), and angiotensin I levels. These results provide evidence for an effect of angiotensin II blockade on cardiac ACE 2 mRNA that may be due to direct blockade of AT1a receptors or a modulatory effect of increased angiotensin-(1–7).
Key Words: angiotensin • receptors, angiotensin • angiotensin-converting enzyme • myocardial infarction • heart failure
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