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• W2020103404 startingPage "1193" @default.
• W2020103404 abstract "Background The regulation of angiotensin II receptors and the two major subtypes (AT 1 and AT 2 ) in chronically failing human ventricular myocardium has not been previously examined. Methods and Results Angiotensin II receptors were measured by saturation binding of 125 I-[Sar 1 ,Ile 8 ]angiotensin II in crude membranes from nonfailing (n=19) and failing human left ventricles with idiopathic dilated cardiomyopathy (IDC; n=31) or ischemic cardiomyopathy (ISC; n=21) and membranes from a limited number of right ventricles in each category. The AT 1 and AT 2 fractions were determined by use of an AT 1 -selective antagonist, losartan. β-Adrenergic receptors were also measured by binding of 125 I-iodocyanopindolol with the β 1 and β 2 fractions determined by use of a β 1 -selective antagonist, CGP20712A. AT 1 but not AT 2 density was significantly decreased in the combined (IDC+ISC) failing left ventricles (nonfailing: AT 1 4.66±0.48, AT 2 2.73±0.39; failing: AT 1 3.20±0.29, AT 2 2.70±0.33 fmol/mg protein; mean±SE). The decrease in AT 1 density was greater in the IDC than in the ISC left ventricles (IDC: 2.73±0.40, P <.01; ISC: 3.89±0.39 fmol/mg protein, P =NS versus nonfailing). β 1 but not β 2 density was decreased in the failing left ventricles. AT 1 density was correlated with β 1 density in all left ventricles ( r =.43). AT 1 density was also decreased in IDC right ventricles. In situ reverse transcription–polymerase chain reaction in sections of nonfailing and failing ventricles indicated that AT 1 mRNA was present in both myocytes and nonmyocytes. Conclusions AT 1 receptors are selectively downregulated in failing human ventricles, similar to the selective downregulation of β 1 receptors. The relative lack of AT 1 downregulation in ISC hearts may be related to differences in the degree of ventricular dysfunction." @default.
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• W2020103404 date "1997-03-04" @default.
• W2020103404 modified "2023-09-26" @default.
• W2020103404 title "Selective Downregulation of the Angiotensin II AT ₁ -Receptor Subtype in Failing Human Ventricular Myocardium" @default.
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• W2020103404 doi "https://doi.org/10.1161/01.cir.95.5.1193" @default.
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