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Potassium channels in the central nervous system of the snail, Helix pomatia : Localization and functional characterization

Neuroscience, ISSN: 0306-4522, Vol: 268, Page: 87-101
2014
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Article Description

The distribution and functional presence of three voltage-dependent potassium channels, K v 2.1, K v 3.4, K v 4.3, respectively, were studied in the central nervous system of the snail Helix pomatia by immunohistochemical and electrophysiological methods. Cell clusters displaying immunoreactivity for the different channels were observed in all parts of the CNS, although their localization and number partly varied. Differences were also found in their intracellular, perikaryonal and axonal localization, as well as in their presence in non-neuronal tissues nearby the CNS, such as the perineurium and the aorta wall. At ultrastructural level K v 4.3 channel immunolabeling was observed in axon profiles containing large 80–100 nm granular vesicles. Blotting analyses revealed specific signals for the K v 2.1, K v 3.4 and K v 4.3 channels, confirming the presence of the channels in the Helix CNS. Voltage-clamp recordings proved that outward currents obtained from neurons displaying K v 3.4 or K v 4.3 immunoreactivity contained transient components while K v 2.1 immunoreactive cells were characterized by delayed currents. The distribution of the K + -channels containing neurons suggests specific roles in intercellular signaling processes in the Helix CNS, most probably related to well-defined, partly local events. The cellular localization of the K + -channels studied supports their involvement in both pre- and postsynaptic events at perikaryonal and axonal levels.

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