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Swelling-activated Chloride and Potassium Conductance in Primary Cultures of Mouse Proximal Tubules. Implication of KCNE1 Protein

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Abstract

Volume-sensitive chloride and potassium currents were studied, using the whole-cell clamp technique, in cultured wild-type mouse proximal convoluted tubule (PCT) epithelial cells and compared with those measured in PCT cells from null mutant kcne1 −/− mice. In wild-type PCT cells in primary culture, a Cl− conductance activated by cell swelling was identified. The initial current exhibited an outwardly rectifying current-voltage (I-V) relationship, whereas steady-state current showed decay at depolarized membrane potentials. The ion selectivity was I− > Br− > Cl− >> gluconate. This conductance was sensitive to 1 mM 4,4′-Diisothiocyanostilbene-2,2′-disulfonic acid (DIDS), 0.1 mM 5-nitro-2-(3-phenylpropylamino)benzoic acid (NPPB) and 1 mM diphenylamine-2-carboxylate (DPC). Osmotic stress also activated K+ currents. These currents are time-independent, activated at depolarized potentials, and inhibited by 0.5 mM quinidine, 5 mM barium, and 10 µM clofilium but are insensitive to 1 mM tetraethylammonium (TEA), 10 nM charybdotoxin (CTX), and 10 µM 293B. In contrast, the null mutation of kcne1 completely impaired volume-sensitive chloride and potassium currents in PCT. The transitory transfection of kcne1 restores both Cl− and K+ swelling-activated currents, confirming the implication of KCNE1 protein in the cell-volume regulation in PCT cells in primary cultures.

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Authors and Affiliations

  1. UMR CNRS 6548, Université de Nice-Sophia Antipolis, 06108 Nice Cedex 2, France

    H. Barrière, I. Rubera, R. Belfodil, M. Tauc, N. Tonnerieux, C. Poujeol & P. Poujeol

  2. UMR CNRS 6097, IPMC, Sophia Antipolis, 06560 Valbonne, France

    J. Barhanin

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  1. H. Barrière
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  2. I. Rubera
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  3. R. Belfodil
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  4. M. Tauc
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  5. N. Tonnerieux
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  6. C. Poujeol
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Correspondence to C. Poujeol.

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Barrière, H., Rubera, I., Belfodil, R. et al. Swelling-activated Chloride and Potassium Conductance in Primary Cultures of Mouse Proximal Tubules. Implication of KCNE1 Protein . J. Membrane Biol. 193, 153–170 (2003). https://doi.org/10.1007/s00232-003-2014-z

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