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Expression of an Artificial Cl− Channel in Microperfused Renal Proximal Tubules

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Abstract

To better understand the process of fluid movement driven by Cl− conductance, a Cl− channel-forming peptide was delivered to the luminal membrane of microperfused rabbit renal proximal tubules. When the peptide (NK4-M2GlyR) was perfused, a significant new conductance was observed within 3 min and stabilized at 10 min. Alteration of the ion composition revealed it to be a Cl−-specific conductance. Reabsorption of Cl− (J Cl) was increased by NK4-M2GlyR, but not by a scramble NK4-M2GlyR sequence, suggesting that the active peptide formed de novo Cl− channels in the luminal membrane of the perfused tubules. In the presence of the peptide, reabsorption of fluid (J v) was dramatically increased and J Na and J Ca were concomitantly increased. We propose that introduction of the new Cl− conductance in the luminal membrane leads to a coordinated efflux of water across the membrane and an increase in cation translocation via the paracellular pathway, resulting in an increase in J v. This novel method could prove useful in characterizing mechanisms of fluid transport driven by Cl− gradients.

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Authors and Affiliations

  1. Department of Pharmacology, Jichi Medical School, Tochigi, Japan

    N. Matsumoto, M. Imai & M. Suzuki

  2. Department of Pediatric Nephrology, Tokyo Women’s Medical University, Tokyo, Japan

    N. Matsumoto & K. Ito

  3. Department of Clinical Pharmacology, Jichi Medical School, Tochigi, Japan

    S. Tsuruoka

  4. Department of Biochemistry, Kansas State University, Manhattan, Kansas, USA

    T. Iwamoto & J. M. Tomich

Authors
  1. N. Matsumoto
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  2. S. Tsuruoka
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  3. T. Iwamoto
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  4. J. M. Tomich
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  5. K. Ito
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  6. M. Imai
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  7. M. Suzuki
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Correspondence to M. Suzuki.

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Matsumoto, N., Tsuruoka, S., Iwamoto, T. et al. Expression of an Artificial Cl− Channel in Microperfused Renal Proximal Tubules . J. Membrane Biol. 193, 195–200 (2003). https://doi.org/10.1007/s00232-003-2018-8

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  • DOI: https://doi.org/10.1007/s00232-003-2018-8

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