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Related Experiment Videos

The CNS renin-angiotensin system.

O von Bohlen und Halbach1, D Albrecht

  • 1Interdisciplinary Center for Neurosciences (IZN), Department of Neuroanatomy, University of Heidelberg, Im Neuenheimer Feld 307, 69120 Heidelberg, Germany. oliver.vonbohlen@arcor.de

Cell and Tissue Research
|March 24, 2006
PubMed
Summary

The brain

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Area of Science:

  • Neuroscience
  • Endocrinology
  • Cardiovascular Research

Background:

  • The brain possesses an intrinsic renin-angiotensin system (RAS).
  • This system generates various bioactive angiotensin peptides, including Angiotensin II (Ang II), Angiotensin IV (Ang IV), and Angiotensin-(1-7) (Ang-(1-7)).
  • These peptides act via specific receptors, influencing neuronal function.

Purpose of the Study:

  • To elucidate the multifaceted roles of the brain's RAS.
  • To explore the neurobiological activities of different angiotensin peptides and their receptors.
  • To understand the RAS's involvement beyond blood pressure regulation.

Main Methods:

  • Review of established literature on the brain's RAS.
  • Analysis of the known functions of angiotensin peptides (Ang II, Ang IV, Ang-(1-7)).
  • Examination of angiotensin receptor (AT1, AT2) signaling pathways.

Main Results:

  • Angiotensin II (Ang II) acts through AT1 and AT2 receptors.
  • AT1 receptors regulate blood pressure and intake behaviors.
  • AT2 receptors are linked to apoptosis, neuronal regeneration, and inhibiting pathological growth.
  • Ang-(1-7) exhibits antihypertensive effects via prostaglandin and nitric oxide pathways.
  • Ang IV and Ang-(1-7) play roles in cognitive functions.
  • Complex interactions exist between multiple angiotensins and receptors in the central nervous system.

Conclusions:

  • The brain's RAS is crucial for regulating blood pressure.
  • It also modulates diverse central functions, including sensory processing, learning, memory, and emotional responses.
  • The RAS represents a complex system with significant implications for brain function and disease.

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