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Mechanisms of heterosynaptic facilitation in molluscan neurons

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Abstract

This review is focused on the analysis of research data obtained in one of the models of conditioned reflex, heterosynaptic facilitation (HSF), in the molluscan nervous system. Our experiments were performed on identified giant command neurons LS1 and PS1 of the freshwater snail Planorbarius corneus. HSF was elicited during the electrical stimulation of two nerves: pallial (the analog of unconditioned stimulation — US) and one of the cerebral nerves (the analog of the conditioned stimulation — CS). The degree of HSF manifestation depended not on the intensity of the synaptic response of the giant neuron to US, but the efficacy of the connection between the pallial nerve and neurosecretory neurons surrounding the command neuron of the mesocerebrum. It is demonstrated that HSF develops due to the diffuse neurohumoral action of serotonin (5-hydroxytryptamine — 5-HT) on the postsynaptic structures, but not as a result of local synaptic action on the presynaptic mechanism. Approximately 70% of US cases of 5-HT application induced a four- to six-fold increase in amplitude of the excitatory postsynaptic potential (EPSP) and acetylcholine (ACh) response. Both responses are N-cholinergic and depend on the membrane permeability to Na+ and K+. In 30% of the cases, ACh response diminished simultaneously with EPSP increase. The 5-HT effect on EPSP and ACh responses were mimicked by the action of phosphodiersterase blockers and adenylate cyclase activators. Thus, the activation of the adenylate cyclase system following 5-HT action facilitates the postsynaptic mechanism underlying HSF formation in command neurons of Planorbarius corneus. Dopamine (DA) and noradrenaline (NA) blocked EPSP and simultaneously increased the amplitude of ACh response. These monoamines were also blocked HSF. The wash-out of catecholamines following HSF blockade enhanced the restoration and subsequent prolongation of synaptic facilitation. It is thus concluded that DA or NA may control the HSF intensity and duration under natural conditions of the nervous system in the molluscs.

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  1. Bogomoletz Institute of Physiology, Ukrainian Academy of Sciences, Kiev

    I. N. Antonov

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Neirofiziologiya/Neurophysiology, Vol. 25, No. 3, pp. 224–232, May–June, 1993.

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Antonov, I.N. Mechanisms of heterosynaptic facilitation in molluscan neurons. Neurophysiology 25, 191–199 (1993). https://doi.org/10.1007/BF01053150

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  • DOI: https://doi.org/10.1007/BF01053150

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