N-methyl-D-aspartate-dependent long-term potentiation of excitatory transmission in trigeminal subnucleus oralis

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Abstract

This study for the first time demonstrates early developmental changes of passive/active membrane properties, and long-term potentiation (LTP) of excitatory synaptic transmission at spinal trigeminal subnucleus caudalis (Vc)-to-oralis (Vo) synapses. During postnatal development, the probability of Vo neurons with monosynaptic excitatory postsynaptic currents (EPSCs) upon Vc stimulation significantly increased, whereas the input resistances of Vo neurons and the latencies of monosynaptic EPSCs significantly decreased. Application of a 'pairing' protocol that comprises 2 Hz-conditioning stimulation of Vc with postsynaptic depolarization of Vo neuron to +30 mV generated LTP of α-amino-3-hydroxy-5-methylisoxazole-4-propionic acid receptor-mediated monosynaptic EPSC amplitude in more than 70% of Vo neurons. The induction of LTP required the activation of N-methyl-D-aspartate receptor, but its magnitudes had correlation neither with postnatal ages nor with baseline EPSC amplitudes.

Original languageEnglish
Pages (from-to)733-738
Number of pages6
JournalNeuroReport
Volume19
Issue number7
DOIs
StatePublished - May 2008

Keywords

  • EPSC
  • Long-term potentiation
  • Oralis
  • Spinal trigeminal nucleus

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