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Nonsynaptic plasticity underlies a compartmentalized increase in synaptic efficacy after classical conditioning

journal contribution
posted on 2023-06-08, 14:40 authored by Evgeny S Nikitin, Pavel M Balaban, George KemenesGeorge Kemenes
It 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.

History

Publication status

  • Published

File Version

  • Published version

Journal

Current Biology

ISSN

0960-9822

Publisher

Elsevier

Issue

7

Volume

23

Page range

614-619

Department affiliated with

  • Neuroscience Publications

Full text available

  • No

Peer reviewed?

  • Yes

Legacy Posted Date

2013-04-08

First Compliant Deposit (FCD) Date

2016-08-17

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