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Related Experiment Videos

Cardiac renin-angiotensin system.

W Linz1, B Schölkens, K Lindpaintner

  • 1German Institute for High Blood Pressure Research, University of Heidelberg, Federal Republic of Germany.

American Journal of Hypertension
|April 1, 1989
PubMed
Summary

Researchers found evidence of a functional cardiac renin-angiotensin system in the heart. This system involves gene expression and peptide presence, demonstrating an active pathway for angiotensin II in cardiac tissue.

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Area of Science:

  • Cardiovascular Physiology
  • Molecular Biology
  • Biochemistry

Background:

  • The renin-angiotensin system (RAS) is crucial for blood pressure regulation.
  • Its presence and function within cardiac tissue have been debated.

Purpose of the Study:

  • To investigate the existence and activity of a cardiac renin-angiotensin system.
  • To determine if cardiac tissue expresses components of the RAS and can activate angiotensin II.

Main Methods:

  • Northern blot and liquid hybridization to detect gene expression (renin, angiotensinogen).
  • High-pressure liquid chromatography (HPLC) controlled radioimmunoassays (RIAs) to quantify angiotensin peptides.
  • In vitro assays to measure converting-enzyme activity and renin infusion effects.

Main Results:

  • Renin and angiotensinogen gene expression confirmed in rat atria and ventricles.
  • Angiotensin I and II peptides detected in monkey and rat heart tissue.
  • Evidence of converting-enzyme activity and intracardiac angiotensin II activation from angiotensin I.
  • Renin infusion led to angiotensin I release and conversion to angiotensin II, blocked by inhibitors.

Conclusions:

  • The study provides strong evidence for a functionally active renin-angiotensin system within cardiac tissue.
  • This cardiac RAS may play a significant role in local cardiovascular regulation.
  • Further research into the specific functions of the cardiac RAS is warranted.

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