A glycine receptor antagonist, strychnine, blocked NMDA receptor activation in the neonatal mouse neocortex

Naohisa Miyakawa, Shigeo Uchino, Takayuki Yamashita, Hidetsugu Okada, Takeshi Nakamura, Shuichi Kaminogawa, Yusei Miyamoto, Tatsuhiro Hisatsune

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

The NMDA receptor (NMDAR) is a Ca2+-permeable cation channel that plays a critical role in neural network formation during brain development. Since it is blocked in a voltage-dependent manner by extracellular Mg2+, in order for the NMDA to be activated, the membrane must be strongly depolarized. Immature neurons in the developing neocortex can be depolarized by ligand-gated Cl- channels, such as the glycine receptor (GlyR) or GABAA receptor (GABAAR). We here assess the contribution of GlyRs to Ca2+ influx via NMDARs in neonatal mouse cortical neurons. The GlyR antagonist, strychnine, was more effective in suppressing post-synaptic Ca2+ influx than the GABAAR antagonist, picrotoxin, suggesting greater potentiation of NMDARs by GlyRs than by GABAARs. The GlyR, known to be endogenously activated at this stage, may play a critical role in neocortical development.

Original languageEnglish
Pages (from-to)1667-1673
Number of pages7
JournalNeuroReport
Volume13
Issue number13
Publication statusPublished - 2002 Sep 16
Externally publishedYes

Keywords

  • Cortical plate neurons
  • Developing neocortex
  • Glycine receptors
  • Neural network formation
  • NMDA receptors
  • Taurine

ASJC Scopus subject areas

  • Neuroscience(all)

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