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What are the roles of the many different types of potassium channel expressed in cerebellar granule cells?

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Abstract

Potassium (K) channels have a key role in the regulation of neuronal excitability. Over a hundred different subunits encoding distinct K channel subtypes have been identified so far. A major challenge is to relate these many different channel subunits to the functional K currents observed in native neurons. In this review, we have concentrated on cerebellar granule neurons (CGNs). We have considered each of the three principal super families of K channels in turn, namely, the six transmembrane domain, voltage-gated super family, the two transmembrane domain, inward-rectifier super family and the four transmembrane domain, leak channel super family. For each super family, we have identified the subunits that are expressed in CGNs and related the properties of these expressed channel subunits to the functional currents seen in electrophysiological recordings from these neurons. In some cases, there are strong molecular candidates for proteins underlying observed currents. In other cases the correlation is less clear. We show that at least 26 potassium channel a subunits are moderately or strongly expressed in CGNs. Nevertheless, a good empirical model of CGN function has been obtained with just six distinct K conductances. The transient K current in CGNs, seems due to expression of Kv4.2 channels or Kv4.2/4.3 heteromers, while the Kca current is due to expression of large-conductance slo channels. The G-protein activated K IR current is probably due to heteromeric expression of K iR 3.1 and K iR 3.2. Perhaps K iR 2.2 subunits underlie the K iR current when it is constitutively active. The leak conductance can be attributed to TASK-1 and or TASK-3 channels. With less certainty, the IK-slow current may be due to expression of one or more members of the KCNQ or EAG family. Lastly, the delayed-rectifier Kv current has as many as six different potential contributors from the extensive Kv family of α subunits. Since many of these subunits are highly regulated by neurotransmitters, physiological regulators and, often, auxiliary subunits, the resulting electrical properties of CGNs may be highly dynamic and subject to constant fine-tuning.

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  1. Biophysics Section, Blackett Laboratory, Department of Biological Sciences, Imperial College of Science Technology and Medicine, Prince Consort Road, SW7 2BW, London, UK

    Alistair Mathie, Catherine E. Clarke, Kishani M. Ranatunga & Emma L. Veale

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  1. Alistair Mathie
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Mathie, A., Clarke, C.E., Ranatunga, K.M. et al. What are the roles of the many different types of potassium channel expressed in cerebellar granule cells?. Cerebellum 2, 11–25 (2003). https://doi.org/10.1080/14734220310015593

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