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Circulating endothelin influences area postrema neurons.

A V Ferguson1, P Smith

  • 1Department of Physiology, Queen's University, Kingston, Ontario, Canada.

Regulatory Peptides
|January 1, 1991
PubMed
Summary
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Endothelin (ET), a potent vasoconstrictor, excites neurons in the area postrema (AP), influencing blood pressure. This peptide also inhibits neurons in the adjacent NTS, suggesting a role in cardiovascular control.

Area of Science:

  • Neuroscience
  • Cardiovascular Physiology
  • Endocrinology

Background:

  • Endothelin (ET) is a potent endogenous vasoconstrictor.
  • ET binding sites are found in brain circumventricular structures, including the area postrema (AP).
  • The AP is implicated in central cardiovascular control.

Purpose of the Study:

  • To investigate if ET affects AP neuronal activity.
  • To determine the role of ET in central cardiovascular regulation.

Main Methods:

  • Extracellular single unit recording in AP neurons.
  • Systemic administration of ET (0.1-10.0 pmol).
  • Comparison of ET effects on AP and adjacent nucleus tractus solitarii (NTS) neurons.

Main Results:

Related Experiment Videos

  • Systemic ET administration altered the activity of 32 out of 60 tested AP neurons.
  • The majority (84%) of influenced AP neurons showed an excitatory response to ET.
  • In contrast, ET predominantly inhibited (84%) adjacent NTS neurons.

Conclusions:

  • Circulating ET influences AP neuronal function, primarily through excitation.
  • ET also affects NTS neuronal activity, suggesting a role in cardiovascular control.
  • These findings highlight ET's role in central cardiovascular regulation via neuronal modulation.