Endothelin-1 facilitates synaptic transmission in the nucleus tractus solitarii in normotensive rats but not in spontaneously hypertensive rats

Yoshitaka Hirooka, Miwako Shihara, Kenichi Eshima, Nobuaki Hori, Akira Takeshita

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Abstract

We previously demonstrated that endothelin-1 (ET-1) increases the neuronal activity of neurons in the nucleus tractus solitarii (NTS) and augments the response to glutamate (Glu), using in vitro brainstem slice preparations of normotensive Wistar-Kyoto (WKY) rats. This study was designed to determine whether the effects of ET-1 on neuronal activity and synaptic transmission in the NTS are altered in spontaneously hypertensive rats (SHR). Experiments were performed with WKY rats and age-matched SHR. We recorded the extracellular single unit of neuronal activity of NTS neurons in response to electrical stimulation of the solitary tracts using in vitro brainstem slice preparations. ET-1 or Glu was iontophoretically applied to the recording neurons. ET-1 increased the neuronal activity of NTS neurons in SHR as well as WKY. The magnitude of the increase in the neuronal activity evoked by Glu was augmented by application of ET-1 in WKY rats (6.1 ± 0.6 to 11.1 ± 1.7 spikes/s, p < 0.05) but not in SHR (5.6 ± 0.5 to 5.6 ± 0.6 spikes/s). These results indicate that ET-1 increases the neuronal activity of the NTS in both SHR and WKY. However, the increase in neuronal activity in response to Glu is augmented by ET-1 in WKY but not in SHR, suggesting that reflex control is impaired in SHR.

Original languageEnglish
Pages (from-to)43-48
Number of pages6
JournalHypertension Research - Clinical and Experimental
Volume22
Issue number1
DOIs
Publication statusPublished - Mar 1999

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Solitary Nucleus
Endothelin-1
Inbred SHR Rats
Synaptic Transmission
Inbred WKY Rats
Glutamic Acid
Neurons
Brain Stem
Electric Stimulation
Reflex

All Science Journal Classification (ASJC) codes

  • Internal Medicine
  • Physiology
  • Cardiology and Cardiovascular Medicine

Cite this

Endothelin-1 facilitates synaptic transmission in the nucleus tractus solitarii in normotensive rats but not in spontaneously hypertensive rats. / Hirooka, Yoshitaka; Shihara, Miwako; Eshima, Kenichi; Hori, Nobuaki; Takeshita, Akira.

In: Hypertension Research - Clinical and Experimental, Vol. 22, No. 1, 03.1999, p. 43-48.

Research output: Contribution to journalArticle

Hirooka, Yoshitaka ; Shihara, Miwako ; Eshima, Kenichi ; Hori, Nobuaki ; Takeshita, Akira. / Endothelin-1 facilitates synaptic transmission in the nucleus tractus solitarii in normotensive rats but not in spontaneously hypertensive rats. In: Hypertension Research - Clinical and Experimental. 1999 ; Vol. 22, No. 1. pp. 43-48.
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