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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
Ca2+ oscillations mediated by the synergistic excitatory actions of GABA(A) and NMDA receptors in the neonatal hippocampus.
Neuron 1997 Februrary
We asked whether GABA(A) and NMDA receptors may act in synergy in neonatal hippocampal slices, at a time when GABA exerts a depolarizing action. The GABA(A) receptor agonist isoguvacine reduced the voltage-dependent Mg2+ block of single NMDA channels recorded in cell-attached configuration from P(2-5) CA3 pyramidal neurons and potentiated the Ca2+ influx through NMDA channels. The synaptic response evoked by electrical stimulation of stratum radiatum was mediated by a synergistic interaction between GABA(A) and NMDA receptors. Network-driven Giant Depolarizing Potentials, which are a typical feature of the neonatal hippocampal network, provided coactivation of GABA(A) and NMDA receptors and were associated with spontaneous and synchronous Ca2+ increases in CA3 pyramidal neurons. Thus, at the early stages of development, GABA is a major excitatory transmitter that acts in synergy with NMDA receptors. This provides in neonatal neurons a hebbian stimulation that may be involved in neuronal plasticity and network formation in the developing hippocampus.
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