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- W1992173844 abstract "Angiotensin-converting enzyme-2 (ACE2) converts angiotensin II (ANG II) to angiotensin-(1–7) [ANG-(1–7)], and this enzyme may serve as a key regulatory juncture in various tissues. Although the heart expresses ACE2, the extent that the enzyme participates in the cardiac processing of ANG II and ANG-(1–7) is equivocal. Therefore, we utilized the Langendorff preparation to characterize the ACE2 pathway in isolated hearts from male normotensive Sprague-Dawley [Tg (−) ] and hypertensive [mRen2]27 [Tg (+) ] rats. During a 60-min recirculation period with 10 nM ANG II, the presence of ANG-(1–7) was assessed in the cardiac effluent. ANG-(1–7) generation from ANG II was similar in both the normal and hypertensive hearts [Tg (−) : 510 ± 55 pM, n = 20 vs. Tg (+) : 497 ± 63 pM, n = 14] with peak levels occurring at 30 min after administration of the peptide. ACE2 inhibition (MLN-4760, 1 μM) significantly reduced ANG-(1–7) production by 83% (57 ± 19 pM, P < 0.01, n = 7) in the Tg (+) rats, whereas the inhibitor had no significant effect in the Tg (−) rats (285 ± 53 pM, P > 0.05, n = 10). ACE2 activity was found in the effluent of perfused Tg (−) and Tg (+) hearts, and it was highly associated with ACE2 protein expression ( r = 0.78). This study is the first demonstration for a direct role of ACE2 in the metabolism of cardiac ANG II in the hypertrophic heart of hypertensive rats. We conclude that predominant expression of cardiac ACE2 activity in the Tg (+) may be a compensatory response to the extensive cardiac remodeling in this strain." @default.
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- W1992173844 date "2007-06-01" @default.
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- W1992173844 title "Primary role of angiotensin-converting enzyme-2 in cardiac production of angiotensin-(1–7) in transgenic Ren-2 hypertensive rats" @default.
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- W1992173844 doi "https://doi.org/10.1152/ajpheart.01198.2006" @default.
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