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- W2116412941 abstract "Abstract —Two subtypes of angiotensin II (Ang II) receptors, type 1 (AT 1 -R) and type 2 (AT 2 -R), have been identified in the heart. However, little is known about the regulation of cardiac AT 1 -R and AT 2 -R by Ang II in vivo. Thus, we examined cardiac AT 1 -R and AT 2 -R in angiotensinogen-deficient ( Atg-/- ) mice that are hypotensive and lack circulating Ang II. Cardiac Ang II receptors (Ang II-R) were assessed by radioligand binding with 125 I-[Sar 1 ,Ile 8 ]–Ang II in plasma membrane fractions. AT 1 -R and AT 2 -R were distinguished using their specific antagonists CV-11974 and PD123319 , respectively. Total densities of Ang II-R and AT 1 -R density were significantly greater in the Atg-/- mice than Atg+/+ mice (31.1±2.8 versus18.8±2.1, 28.7±3.0 versus16.9±2.3 fmol/mg protein, P <.01, respectively), and AT 2 -R showed a slight but not significant increase in Atg-/- mice relative to Atg+/+ control animals. K d values were not different between the two groups. In contrast to binding experiments, levels of Ang II type 1a receptor (AT 1a -R) and AT 2 -R mRNA did not differ between Atg-/- and Atg+/+ mice. These results suggest that lack of Ang II may upregulate AT 1 -R through translational and/or posttranslational mechanisms in Atg-/- mice." @default.
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- W2116412941 date "1998-01-01" @default.
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- W2116412941 title "Increased Cardiac Angiotensin II Receptors in Angiotensinogen-Deficient Mice" @default.
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- W2116412941 doi "https://doi.org/10.1161/01.hyp.31.1.45" @default.
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