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The Journal of Neurophysiology Vol. 83 No. 3 March 2000, pp. 1346-1355
Copyright ©2000 by the American Physiological Society
Department of Molecular and Integrative Physiology and the Neuroscience Program, University of Illinois, Urbana, Illinois 61801
Jing, Jian and
Rhanor Gillette.
Escape Swim Network Interneurons Have Diverse Roles in Behavioral
Switching and Putative Arousal in Pleurobranchaea. J. Neurophysiol. 83: 1346-1355, 2000. Escape swimming in the predatory sea slug
Pleurobranchaea is a dominant behavior that overrides
feeding, a behavioral switch caused by swim-induced inhibition of
feeding command neurons. We have now found distinct roles for the
different swim interneurons in acute suppression of feeding during the
swim and in a longer-term stimulation of excitability in the feeding
network. The identified pattern-generating swim neurons A1, A3, A10,
and their follower interneuron A-ci1, suppress feeding motor output
partly by excitation of the I1 feeding interneurons, which
monosynaptically inhibit both the feeding command neurons,
PCP, PSE, and other major interneurons, the I2s. This
mechanism exerts broad inhibition of the feeding network suitable to an
escape response; broader than feeding suppression in learned and
satiation-induced food avoidance and acting through a different
presynaptic pathway. Four intrinsic neuromodulatory neurons of the swim
network, the serotonergic As1-4, add little to direct suppression of
feeding. Rather, they monosynaptically excite the serotonergic
metacerebral giant (MCG) neurons of the feeding network, themselves
intrinsic neuromodulators of feeding, as well as a cluster of adjacent
serotonergic feeding neurons, with both fast and slow EPSPs. They also
provide mild neuromodulatory excitation of the PCP/PSE
feeding command neurons, and I1 and I2 feeding interneurons, which is
masked by inhibition during the swim. As1-4 also excite the
serotonergic pedal ganglion G neurons for creeping locomotion. These
observations further delineate the nature of the putative serotonergic
arousal system of gastropods and suggest a central coordinating role to
As1-4.
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