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An Outwardly Rectifying and Deactivating Chloride Channel Expressed by Interstitial Cells of Cajal from the Murine Small Intestine

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Abstract

Recent studies have suggested a role for a chloride current in the modulation of pacemaker potentials generated by interstitial cells of Cajal. Patch-clamp recordings were made from inside–out patches of cultured interstitial cells of Cajal from the murine small intestine. The majority of patches were quiescent immediately after excision, but in some patches currents activated spontaneously after a period of 10 min to 1 h. Currents could also be activated by strongly polarizing the patch. It was found that the currents activated in both cases included a chloride channel. This channel could also be activated by ATP and the catalytic subunit of protein kinase A. The channel had conductance states (±SD) of 53 ± 25.35, 126 ± 21.44, 180 ± 12.57 and 211 ± 8.86 pS. It was outwardly rectifying (as a function of open probability) and deactivated (i.e., gave a tail current) but showed no inactivation. The permeability sequence of the channel was I−>>Br−≥Cl−>Asp−. It was unaffected in magnitude or rectification by changing the free Ca2+ concentration of the bath between <10 nm, 100 nm (control) and 2 mm.

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Acknowledgments

This study was supported by a program project grant (P01 DK41315) from the NIDDK of the National Institutes of Health.

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Authors and Affiliations

  1. Department of Physiology and Cell Biology, University of Nevada School of Medicine, Reno, NV, 89557, UK

    Sean P. Parsons & Kenton M. Sanders

  2. 5 Tankerville Road, London, SW17 5LL, UK

    Sean P. Parsons

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  1. Sean P. Parsons
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  2. Kenton M. Sanders
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Correspondence to Sean P. Parsons.

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Parsons, S.P., Sanders, K.M. An Outwardly Rectifying and Deactivating Chloride Channel Expressed by Interstitial Cells of Cajal from the Murine Small Intestine. J Membrane Biol 221, 123–132 (2008). https://doi.org/10.1007/s00232-007-9084-2

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  • DOI: https://doi.org/10.1007/s00232-007-9084-2

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