What drives the tonic activity of presympathetic neurons in the rostral ventrolateral medulla?

R. A L Dampney*, T. Tagawa, J. Horiuchi, P. D. Potts, M. Fontes, J. W. Polson

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

52 Citations (Scopus)

Abstract

1. The present review discusses the mechanisms that maintain the tonic activity of presympathetic cardiovascular neurons in the rostral part of the ventrolateral medulla. 2. Experimental evidence is reviewed that indicates that these neurons receive both tonic excitatory and tonic inhibitory synaptic inputs. The former appear to be mediated, at least in part, by glutamate receptors and the latter appear to be mediated by GABA receptors. 3. There is also evidence that these neurons have the capacity to generate action potentials in the absence of synaptic inputs. However, at present, there is not clear evidence that such an intrinsic pacemaker-like mechanism contributes to the tonic activity of these neurons under normal resting conditions. 4. These neurons are also chemosensitive and this may contribute to their tonic activation under conditions of hypoxia or hypercapnia.

Original languageEnglish
Pages (from-to)1049-1053
Number of pages5
JournalClinical and Experimental Pharmacology and Physiology
Volume27
Issue number12
DOIs
Publication statusPublished - 2000
Externally publishedYes

Keywords

  • Blood pressure regulation
  • Brainstem
  • GABA
  • Glutamate
  • Sympathetic vasomotor tone

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