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Nitroxidergic nerves and hypertension

N Toda1

  • 1Department of Pharmacology, Shiga University of Medical Sciences, Ohtsu, Japan.

Hypertension Research : Official Journal of the Japanese Society of Hypertension
|March 1, 1995
PubMed
Summary
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Nitroxidergic vasodilator nerves, releasing nitric oxide (NO), regulate vascular tone and blood pressure. Inhibiting NO synthesis elevates blood pressure, highlighting the crucial role of these nerves in cardiovascular homeostasis.

Area of Science:

  • Neuroscience
  • Cardiovascular Physiology
  • Pharmacology

Background:

  • Nitric oxide (NO) is implicated as a neurotransmitter in vascular regulation.
  • The role of NO-mediated vasodilator nerves in controlling systemic blood pressure requires further elucidation.

Purpose of the Study:

  • To investigate the mechanisms of neurally induced vasodilation in canine cerebral arteries.
  • To analyze the contribution of nitroxidergic vasodilator nerves to vascular tone and blood pressure regulation.

Main Methods:

  • Pharmacological, biochemical, and histological analyses were employed.
  • Nerve stimulation and administration of NO synthase inhibitors were performed in vitro and in vivo.

Main Results:

Related Experiment Videos

  • Evidence supports NO synthesized in nerve terminals acting as a neurotransmitter, activating guanylate cyclase and causing smooth muscle relaxation.
  • Peripheral arteries exhibit nerve stimulation-induced contractions reversed to relaxations by alpha-adrenoceptor blockade, mediated by NO.
  • NO synthase inhibitors potentiate adrenergic nerve-induced arterial contraction and increase systemic blood pressure in anesthetized dogs.

    • Conclusions:

    • Nitroxidergic vasodilator nerves play a significant role in regulating vascular tone both in vitro and in vivo.
    • Suppressed NO synthesis and release from vasodilator nerves are associated with increased systemic blood pressure.
    • These findings offer new insights into hypertension mechanisms and the function of NO-mediated nerve pathways.