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Related Experiment Videos

Interaction between endothelin and angiotensin II.

P A Phillips1

  • 1Department of Medicine, Flinders University of South Australia, Adelaide, South Australia. paddy.phillips@flinders.edu.au

Clinical and Experimental Pharmacology & Physiology
|July 16, 1999
PubMed
Summary

Angiotensin II (AngII) causes cardiac hypertrophy independently of endothelin (ET) and ETA receptors. This study found AngII induces left ventricular hypertrophy through a non-pressor mechanism, not mediated by ET.

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Area of Science:

  • Cardiovascular Physiology
  • Molecular Cardiology
  • Pharmacology

Background:

  • Angiotensin II (AngII) and endothelin (ET) are known stimulators of cardiac hypertrophy.
  • AngII has been shown to stimulate ET production, suggesting a potential pathway for cardiac hypertrophy.

Purpose of the Study:

  • To investigate if AngII-induced cardiac hypertrophy is mediated by ET acting on the ETA receptor.
  • To elucidate the specific role of the ETA receptor in AngII's effects on cardiac structure and function.

Main Methods:

  • Male Sprague-Dawley rats received intravenous AngII infusions at varying doses (0, 100, 200 ng/kg/min) for 7 days.
  • Rats were co-treated with a selective ETA receptor antagonist (BMS 193884) or vehicle.
  • Mean arterial pressure (MAP) and left ventricular weights were assessed.

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Main Results:

  • AngII infusion at 200 ng/kg/min significantly increased MAP and left ventricular weights.
  • ETA receptor blockade lowered MAP but did not affect AngII-induced increases in left ventricular weights.
  • Cardiac hypertrophy occurred even when MAP was normalized by ETA blockade, indicating a non-pressor effect.

Conclusions:

  • Angiotensin II induces left ventricular hypertrophy through a mechanism independent of endothelin and ETA receptor activation.
  • The hypertrophic effect of AngII in this model is not mediated by the pressor response or ET signaling via ETA receptors.
  • These findings suggest a direct non-pressor pathway for AngII in cardiac hypertrophy.