Actions of glycine on non-dopaminergic neurons of the rat substantia nigra

N. B. Mercuri, A. Bonci, A. Pisani, P. Calabresi, G. Bernardi

Research output: Contribution to journalArticlepeer-review

Abstract

The effects of glycine on non-dopaminergic cells in rat substantia nigra pars compacta and pars reticulata maintained in vitro were investigated using intracellular recording techniques. Glycine, superfused at a concentration between 30 μM and 1 mM, reversibly blocked the spontaneous firing of these neurons. The inhibition of firing discharge was associated with a hyperpolarization of the membrane (potassium acetate-filled electrodes) and an increase in conductance. Under voltage-clamp experiments (holding potential between -57 and -65 mV), glycine produced an outward response which reversed polarity at about -74 mV. However, when the recording electrodes were filled with KCl, the glycinergic response was mainly depolarizing/inward and reversed at about -43 mV, Thus, it appeared to be due to an increase in chloride permeability. Furthermore, the effects of glycine were reversibly antagonized by strychnine (between 300 nM and 1 μM). Our findings demonstrate that glycine is a potent inhibitory agent on non-dopaminergic cells of the substantia pars compacta and pars reticulata that acts by activating strychnine-sensitive receptors.

Original languageEnglish
Pages (from-to)2351-2354
Number of pages4
JournalEuropean Journal of Neuroscience
Volume7
Issue number11
DOIs
Publication statusPublished - 1995

Keywords

  • In vitro electrophysiological recording
  • Strychnine
  • Substantia nigra pars compacta and pars reticulata

ASJC Scopus subject areas

  • Neuroscience(all)

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