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S-100-immunoreactive protein in Helix neurons
A Hermann1, H Kubista, H H Kerschbaum
1Department of Animal-Physiology, University of Salzburg, Austria.
Acta Biologica Hungarica
|January 1, 1995
Summary
S-100 proteins, calcium-binding molecules, were found in specific neurons of the snail Helix pomatia central nervous system. These proteins modulate neuronal electrical activity by affecting calcium-activated potassium currents.
Area of Science:
- Neuroscience
- Cell Biology
- Biochemistry
Background:
- S-100 proteins are calcium-binding proteins with diverse cellular functions.
- Their role in neuronal electrical activity, particularly in invertebrates, remains largely unexplored.
Purpose of the Study:
- To investigate the presence and function of S-100-like proteins in the central nervous system of the terrestrial snail, Helix pomatia.
- To elucidate the effects of S-100 proteins on neuronal electrical properties.
Main Methods:
- Immunocytochemistry was used to localize S-100-like material in Helix pomatia neurons.
- Electrophysiological techniques, including voltage clamp, were employed to study neuronal activity.
- Extracellular application of S-100 proteins was used to assess their functional impact.
Main Results:
- S-100-like immunoreactivity was detected in specific neurons within the cerebral, parietal, and visceral ganglia.
- Immunostained neurons exhibited spontaneous action potential discharge.
- S-100 protein application suppressed spontaneous activity and increased membrane conductance, primarily by modulating calcium-activated potassium currents.
Conclusions:
- S-100-like proteins are present in distinct neuronal populations in the Helix pomatia central nervous system.
- These proteins play a modulatory role in neuronal electrical activity, specifically influencing calcium-dependent potassium currents.