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Immediate plasticity of identifiable synapses in the land snails Helix lucorum

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Sokolov E., Palikhova T.

Acta Neurobiologiae Experimentalis

1999

vol. 59

issue 3

161-169

The data presented concern synaptic plasticity arising during neuronal response to a single sensory stimulus. The plasticity was studied in identifiable synapses between sensory and command neurones of Helix lucorum using simultaneous intracellular recording. A brief mechanosensory stimulation evoked a train of spikes in an identifiable visceral sensory neurone. Interspike intervals within the train changed from short (tens ms) to long (s). Each spike elicited an elementary EPSP in an identifiable command neurone. The amplitude of elementary EPSPs varied during a train of action potentials. Initial high frequency depression was followed by posttetanic potentiation and subsequent low frequency depression. The result of integration of the three plastic processes has been named immediate plasticity. It has been shown that a compound EPSP elicited in a postsynaptic command neurone by a single sensory stimulus depends on the immediate plastic changes of elementary EPSPs.

Anatomical and functional identification of neurones in electrophysiological experiments

100%

Szulczyk P.

Postępy Higieny i Medycyny Doświadczalnej

2000

vol. 54

issue 3

351-361

The electrophysiological studies indicate that peripheral autonomic and primary sensory neurones display a wide variety of ionic currents. The experiments aimed at biophysical and pharmacological analysis of ionic currents are frequently performed on isolated neurones devoid of axones and dendrites. Consequently the ionic currents recordings are limited to the cell soma. The function of somatic ionic channels is largely unknown. We suggest that the functional meaning of the somatic ionic currents can be facilitated by analysis currents properties in functionally identified neurones. Examples are given of different biophysical and pharmacological currents properties in cardiac, glandular, cutaneous and muscular sympathetic neurones. It is concluded that the resting and reflex activity in different categories of sympathetic neurones may be profoundly affected by the biophysical properties of ionic channels expressed in their soma.

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1 Acta Neurobiologiae Experimentalis

1 Postępy Higieny i Medycyny Doświadczalnej

1 2000

1 1999

1 Palikhova T.

1 Sokolov E.

1 Szulczyk P.

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Immediate plasticity of identifiable synapses in the land snails Helix lucorum

Anatomical and functional identification of neurones in electrophysiological experiments