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Nonsynaptic plasticity underlies a compartmentalized increase in synaptic efficacy after classical conditioning
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posted on 2023-06-08, 14:40 authored by Evgeny S Nikitin, Pavel M Balaban, George KemenesGeorge KemenesIt is now well documented in both vertebrates and invertebrates that nonsynaptic as well as synaptic plasticity can be a substrate for long-term memory [1-4]. Little is known, however, about how learning-induced nonsynaptic plasticity can lead to compartmentalized presynaptic changes underlying specific memory traces while leaving other circuit functions of the neuron unaffected. Here, using behavioral, electrophysiological, and optical recording methods, we show that the previously described learning-induced depolarization of a modulatory neuron [5] of the Lymnaea feeding system affects its axonal terminals in a spatially segregated manner. In a side branch of the axon of the cerebral giant cells (CGCs), classical conditioning of intact animals reduced proximal-to-distal attenuation of spike-evoked calcium transients, providing a highly effective mechanism for a compartmentalized increase in synaptic efficacy. Somatic depolarization by current injection, which spreads onto the CGC's axonal side branch [5], and the blocking of A-type potassium channels with 4-aminopyridine had an effect similar to learning on the calcium transients. Both of these experimental manipulations also reduced axonal spike attenuation. These findings suggest that the voltage-dependent inactivation of an A-type potassium current links global nonsynaptic changes to compartmentalized synaptic changes.
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Publication status
- Published
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- Published version
Journal
Current BiologyISSN
0960-9822Publisher
ElsevierExternal DOI
Issue
7Volume
23Page range
614-619Department affiliated with
- Neuroscience Publications
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- No
Peer reviewed?
- Yes
Legacy Posted Date
2013-04-08First Compliant Deposit (FCD) Date
2016-08-17Usage metrics
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