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The angiotensin IV system: functional implications

J W Wright1, L T Krebs, J W Stobb

  • 1Department of Psychology, Washington State University, Pullman 99164-4820, USA.

Frontiers in Neuroendocrinology
|January 1, 1995
PubMed
Summary
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The brain renin-angiotensin system regulates cardiovascular function, water balance, and hormone secretion. A newly discovered AT4 receptor site, prominent in the brain and periphery, may influence memory and blood flow.

Area of Science:

  • Neuroscience
  • Endocrinology
  • Cardiovascular Physiology

Background:

  • The brain renin-angiotensin system (RAS) is crucial for regulating cardiovascular function, water balance, and reproductive hormones.
  • It influences pituitary hormone secretion and involves various angiotensin (Ang) binding sites.
  • While AT1 and AT2 sites are studied, the AT4 site's role is less understood.

Purpose of the Study:

  • To characterize the newly discovered AT4 receptor site.
  • To investigate the potential functions of the AT4 site in both the central nervous system and peripheral tissues.

Main Methods:

  • Characterization of the AT4 binding site.
  • Analysis of AT4 site distribution in the brain and peripheral organs.
  • Exploration of potential physiological roles, including memory and blood flow regulation.

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Main Results:

  • The AT4 site preferentially binds angiotensin IV (AngIV), a fragment of AngII.
  • This site is highly expressed in brain regions like the cerebral cortex and hippocampus, and in peripheral tissues such as the kidney and heart.
  • The AT4 site is implicated in memory processes and blood flow regulation, particularly in the kidney.

Conclusions:

  • The AT4 receptor subtype represents a novel component of the brain and peripheral RAS.
  • Its widespread distribution suggests significant physiological roles in cognition and cardiovascular control.
  • Further research is needed to fully elucidate the functions of the AT4 site in peripheral tissues.