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The Journal of Neurophysiology Vol. 80 No. 6 December 1998,
pp. 3380-3382
Copyright ©1998 The American Physiological Society
RAPID COMMUNICATION
Department of Medical Physiology, Division of Neurophysiology, Panum Institute, University of Copenhagen, 2200-DK Copenhagen N, Denmark
Guertin, P. A. and J. Hounsgaard. NMDA-induced intrinsic voltage oscillations depend on L-type calcium channels in spinal motoneurons of adult turtles. J. Neurophysiol. 80: 3380-3382, 1998. In a slice preparation from adult turtles, bath-applied N-methyl-D-aspartate (NMDA) induced rhythmic activity in spinal motoneurons. The underlying intrinsic oscillation in membrane potential was revealed in the presence of tetrodotoxin (TTX). NMDA-induced rhythmicity, in the presence or absence of TTX, was abolished or reduced by NMDA receptor antagonists and by three different classes of antagonists for L-type calcium channels. It is suggested that both NMDA receptor channels and L-type calcium channels contribute to NMDA-induced intrinsic oscillations in mature spinal motoneurons.
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