γ-Aminobutyric acid-induced response in acutely isolated nucleus solitarii neurons of the rat

Takashi Nakagawa, M. Wakamori, T. Shirasaki, T. Nakaye, N. Akaike

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Abstract

The γ-aminobutyric acid (GABA)-induced macroscopic Cl- current (I(Cl)) was investigated in acutely isolated nucleus tractus solitarii (NTS) neurons by a conventional patch-clamp technique combined with a rapid drug application method. The GABA- and muscimol-induced I(Cl) increased in a concentration-dependent manner. The reversal potentials were close to the Cl- equilibrium potential. Pentobarbital sodium (PB) itself elicited a current. Bicuculline (BIC), strychnine (STR), picrotoxin, benzylpenicillin (PCG), Cd2+, and Zn2+ suppressed the GABA response in a concentration-dependent manner. Both BIC and STR shifted the concentration-response curve for GABA response to the right, whereas PCG suppressed the maximum response without affecting the threshold, indicating that BIC and STR antagonized competitively and PCG noncompetitively. The inhibitory action of PCG on GABA response was in a highly voltage-dependent manner. PB shifted the concentration-response curve for GABA response to the left. The augmentatory effect of PB was voltage dependent.

Original languageEnglish
JournalAmerican Journal of Physiology - Cell Physiology
Volume260
Issue number4 29-4
Publication statusPublished - May 28 1991
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Physiology
  • Cell Biology

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