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Neural Regulation of Blood Pressure01:18

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The neural regulation of blood pressure involves intricate interactions between the autonomic nervous system (ANS) and cardiovascular system, ensuring adequate perfusion of tissues. This regulation primarily occurs through baroreceptor and chemoreceptor reflexes, involving both short-term and long-term mechanisms.
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Updated: May 12, 2026

Implantation of Combined Telemetric ECG and Blood Pressure Transmitters to Determine Spontaneous Baroreflex Sensitivity in Conscious Mice
09:56

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Published on: February 14, 2021

Melatonin modulates baroreflex control via area postrema.

Luciana A Campos1, Jose Cipolla-Neto, Lisete C Michelini

  • 1São José dos Campos Technology Park, University Camilo Castelo Branco (UNICASTELO) São Paulo, Brazil ; Department of Physiology Institute of Biomedical Sciences, University of Sao Paulo Sao Paulo, Brazil.

Brain and Behavior
|March 28, 2013
PubMed
Summary
This summary is machine-generated.

Melatonin, a pineal gland hormone, influences cardiovascular regulation by modulating baroreflex sensitivity. This study found melatonin resets baroreflex control toward lower heart rates, potentially via area postrema receptors.

Keywords:
Area postremabaroreflexblood pressureheart ratemelatonin

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Area of Science:

  • Cardiovascular Physiology
  • Neuroendocrinology

Background:

  • The pineal gland hormone melatonin is recognized for its role in cardiovascular system modulation.
  • The baroreflex arc, crucial for blood pressure homeostasis, involves several neural components.

Purpose of the Study:

  • To investigate the effects of melatonin on baroreflex sensitivity.
  • To determine the role of the area postrema in mediating melatonin's cardiovascular effects.

Main Methods:

  • Mean arterial pressure (MAP) and heart rate (HR) were monitored in conscious rats.
  • Baroreceptor reflex sensitivity was assessed using phenylephrine and sodium nitroprusside challenges.
  • Experiments were conducted in sham-operated rats and rats with area postrema ablation (APX).

Main Results:

  • Melatonin administration caused a downward shift in baroreceptor reflex control, inhibiting reflex tachycardia and potentiating reflex bradycardia.
  • Area postrema ablation led to a sustained decrease in MAP and abolished melatonin's modulatory effects on baroreflex function.
  • Melatonin reset baroreceptor reflex control towards lower HR values.

Conclusions:

  • Circulating melatonin modulates baroreceptor reflex control of heart rate.
  • These modulatory effects are likely mediated through melatonin receptors located in the area postrema, which lies outside the blood-brain barrier.