Alterations of angiotensin II receptor contents in hypertrophied hearts

Biochem Biophys Res Commun. 1995 Jul 17;212(2):326-33. doi: 10.1006/bbrc.1995.1973.


Tsukuba hypertensive mice, which carry the human genes for renin and angiotensinogen, show cardiac hypertrophy as well as hypertension due to activation of the renin-angiotensin system (RAS). Here, we compared the cardiac angiotensin II (Ang II) receptor contents in these and normotensive control mice by means of ligand binding studies and competitive reverse transcription-polymerase chain reaction analyses. The content of the Ang II receptor type 1 (AT1) was significantly higher at both the protein (2.5-fold; p < 0.01) and mRNA (1.4-fold; p < 0.05) levels in the hypertensive mice than that in control mice. Almost identical levels of the Ang II receptor type 2 (AT2) expression were identified at the mRNA levels in the two types of mice, although the levels were less than 20% of those of AT1 mRNA in control mice. These results suggest that AT1 in the heart is upregulated in response to Ang II-induced hypertrophic change and that, in particular, the upregulation of AT1 in particular contributes to the development and/or maintenance of cardiac hypertrophy in conjunction with the increase in Ang II production, because AT1 is responsible for cardiac hypertrophy related to the RAS.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Base Sequence
  • Cardiomegaly / metabolism*
  • Hypertension / metabolism*
  • Male
  • Mice
  • Mice, Inbred C57BL
  • Molecular Sequence Data
  • Myocardium / metabolism*
  • Polymerase Chain Reaction
  • RNA, Messenger / metabolism
  • RNA-Directed DNA Polymerase / metabolism
  • Receptors, Angiotensin / genetics
  • Receptors, Angiotensin / metabolism*


  • RNA, Messenger
  • Receptors, Angiotensin
  • RNA-Directed DNA Polymerase