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Journal of Neuroscience, Vol 7, 2745-2755, Copyright © 1987 by Society for Neuroscience
N-methyl-D-aspartate receptor-induced, inherent oscillatory activity in neurons active during fictive locomotion in the lamprey
P Wallen and S Grillner
Bath application of N-methyl-aspartate induces fictive locomotor activity
in the isolated spinal cord preparation of the lamprey, as well as
TTX-resistant membrane potential oscillations in many individual neurons.
This inherent oscillatory activity is shown to depend on a specific
activation of N-methyl-D-aspartate (NMDA) receptors. This activation
initiates voltage-dependent, magnesium- requiring membrane potential
bistability, presumably due to a development of a region of negative slope
conductance in the current- voltage relation of the neuron. When sodium
ions were removed from the bathing solution, oscillations disappeared, and
the membrane potential was maintained at a hyperpolarized level, suggesting
that the depolarizing current during the oscillatory cycle is mainly
carried by sodium ions. Replacing Ca2+ with Ba2+ also leads to a cessation
of oscillatory activity, with the membrane potential remaining at the more
depolarized level. This indicates an involvement of a Ca2+-dependent K+
current during the repolarization phase. These findings, together with the
voltage dependence, can account for the main characteristics of the NMDA
receptor-induced, TTX-resistant membrane potential oscillations. This
oscillatory behavior has been demonstrated in motoneurons and in several
interneurons including CC interneurons but has not been found in edge
cells, dorsal cells, or lateral interneurons. The possibility that inherent
oscillatory membrane properties may contribute to the activity pattern
during fictive locomotion was investigated in experiments with
intracellular current injection in the absence of TTX. The stimulation
effects obtained required the presence of magnesium ions and were analogous
to the stimulation effects seen during oscillations after TTX blockade.
Together with similarities in, for instance, frequency and amplitude
between the locomotor oscillatory activity and the TTX-resistant
oscillations, the results are compatible with an involvement of inherent,
oscillatory membrane properties during fictive locomotion in the lamprey
spinal cord.
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