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A chloride channel widely expressed in epithelial and non-epithelial cells

Nature volume 356, pages 57–60 (1992)Cite this article

Abstract

CHLORIDE channels have several functions, including the regulation of cell volume1,2, stabilizing membrane potential3,4, signal transduction5,6 and transepithelial transport7. The plasma membrane Cl− channels already cloned belong to different structural classes: ligand-gated channels5,6, voltage-gated channels8,9, and possibly transporters of the ATP-binding-cassette type (if the cystic fibres is transmembrane regulator10 is a Cl− channel11–13). The importance of chloride channels is illustrated by the phenotypes that can result from their malfunction: cystic fibrosis, in which transepithelial transport is impaired, and myotonia3, in which ClC-1, the principal skeletal muscle Cl− channel, is defective9. Here we report the properties of CIC-2, a new member of the voltage-gated Cl− channel family. Its sequence is ~50% identical to either the Torpedo electroplax Cl− channel, ClC-0 (ref. 8), or the rat muscle Cl- channel, ClC-1 (ref. 9). Isolated initially from rat heart and brain, it is also expressed in pancreas, lung and liver, for example, and in pure cell lines of fibroblastic, neuronal, and epithelial origin, including tissues and cells affected by cystic fibrosis. Expression in Xenopus oocytes induces Cl− currents that activate slowly upon hyperpolarization and display a linear instantaneous current-voltage relationship. The conductivity sequence is Cl− ≥Br− > I−. The presence of ClC-2 in such different cell types contrasts with the highly specialized expression of ClC-1 (ref. 9) and also with the cloned cation channels, and suggests that its function is important for most cells.

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Authors and Affiliations

  1. Centre for Molecular Neurobiology (ZMNH), Hamburg University, Martinistrasse 52, D-2000, Hamburg, 20, Germany

    Astrid Thiemann, Stefan Gründer, Michael Pusch & Thomas J. Jentsch

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  1. Astrid Thiemann
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  2. Stefan Gründer
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  3. Michael Pusch
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  4. Thomas J. Jentsch
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Thiemann, A., Gründer, S., Pusch, M. et al. A chloride channel widely expressed in epithelial and non-epithelial cells. Nature 356, 57–60 (1992). https://doi.org/10.1038/356057a0

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