Abstract

Electrical activity was recorded from motoneurons in adult mouse cervical spinal cord (C4–8) slices. Motoneurons showed almost no response to ionophoretic application of N-methyl- d-aspartic acid (NMDA) in both control and Mg 2+-free media, but very sensitive to kainate (KA) and amino-3-hydroxy-5-methylisoxazole-4-propionic acid (AMPA). Bath perfusion of KA, AMPA or glucose/O 2 free Krebs–Ringer solution, but not bath perfusion of NMDA, caused membrane depolarization within 3 min and beading of the dendrite trees after more than 10 min perfusion. Our results indicate that adult motoneurons have few or no NMDA receptors.

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