Pressor responses to electrical and chemical stimulation of the rat brain A10 dopaminergic system

Jennifer L. Cornish*, Maarten van den Buuse

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

33 Citations (Scopus)

Abstract

Central dopaminergic systems have been implicated in the regulation of blood pressure. We examined the effect on blood pressure of electrical or chemical stimulation of the rat brain ventral tegmental area (VTA) which is the region of origin of the A10 dopaminergic system. Electrical stimulation in urethane-anaesthetised rats (10-120 Hz, 80 μA) produced frequency-dependent increases in blood pressure (max 30-35 mmHg). These pressor responses could be significantly attenuated by pretreatment with the dopamine D2 receptor antagonist haloperidol, but not the D1 receptor antagonist SCH 23390. Chemical stimulation of the VTA, by microinjection of 10 nmol of the substance P analogue DiMe-C7, produced a sustained increase in blood pressure (max 10-15 mmHg), which could be completely prevented by pretreatment with haloperidol. These results suggest that stimulation of dopaminergic neurons in the VTA induces pressor responses and that projections from midbrain dopaminergic neurons, acting on dopamine D2 receptors, play a role in the regulation of blood pressure.

Original languageEnglish
Pages (from-to)142-146
Number of pages5
JournalNeuroscience Letters
Volume176
Issue number2
DOIs
Publication statusPublished - 1 Aug 1994
Externally publishedYes

Keywords

  • Blood pressure
  • Central nervous system
  • DiMe-C7
  • Dopamine
  • Dopamine D receptor
  • Haloperidol
  • SCH 23390
  • Sprague-Dawley rat
  • Ventral tegmental area

Fingerprint

Dive into the research topics of 'Pressor responses to electrical and chemical stimulation of the rat brain A10 dopaminergic system'. Together they form a unique fingerprint.

Cite this