Abstract
The renal collecting duct contains two distinct cell types, principal and intercalated cells, expressing potassium Kir4.1/5.1 (KCNJ10/16) and chloride ClC-K2 (ClC-Kb in humans) channels on their basolateral membrane, respectively. Both channels are thought to play important roles in controlling systemic water-electrolyte balance and blood pressure. However, little is known about mechanisms regulating activity of Kir4.1/5.1 and ClC-K2/b. Here, we employed patch clamp analysis at the single channel and whole cell levels in freshly isolated mouse collecting ducts to investigate regulation of Kir4.1/5.1 and ClC-K2/b by dietary K+ and Cl− intake. Treatment of mice with high K+ and high Cl− diet (6% K+, 5% Cl−) for 1 week significantly increased basolateral K+-selective current, single channel Kir4.1/5.1 activity and induced hyperpolarization of basolateral membrane potential in principal cells when compared to values in mice on a regular diet (0.9% K+, 0.5% Cl−). In contrast, basolateral Cl−-selective current and single channel ClC-K2/b activity was markedly decreased in intercalated cells under this condition. Substitution of dietary K+ to Na+ in the presence of high Cl− exerted a similar inhibiting action of ClC-K2/b suggesting that the channel is sensitive to variations in dietary Cl− per se. Cl−-sensitive with-no-lysine kinase (WNK) cascade has been recently proposed to orchestrate electrolyte transport in the distal tubule during variations of dietary K+. However, co-expression of WNK1 or its major downstream effector Ste20-related proline-alanine-rich kinase (SPAK) had no effect on ClC-Kb over-expressed in Chinese hamster ovary (CHO) cells. Treatment of mice with high K+ diet without concomitant elevations in dietary Cl− (6% K+, 0.5% Cl−) elicited a comparable increase in basolateral K+-selective current, single channel Kir4.1/5.1 activity in principal cells, but had no significant effect on ClC-K2/b activity in intercalated cells. Furthermore, stimulation of aldosterone signaling by Deoxycorticosterone acetate (DOCA) recapitulated the stimulatory actions of high K+ intake on Kir4.1/5.1 channels in principal cells but was ineffective to alter ClC-K2/b activity and basolateral Cl− conductance in intercalated cells. In summary, we report that variations of dietary K+ and Cl− independently regulate basolateral potassium and chloride conductance in principal and intercalated cells. We propose that such discrete mechanism might contribute to fine-tuning of urinary excretion of electrolytes depending on dietary intake.
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Acknowledgments
This research was supported by NIH-NIDDK DK095029 (to O. P.), AHA 17GRNT33660488 (to O. P.), NIH-NIDDK DK098145 (to A.R.S.), and ASN Ben J. Lipps Research Fellowship (to V. T.).
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Tomilin, V.N., Zaika, O., Subramanya, A.R. et al. Dietary K+ and Cl− independently regulate basolateral conductance in principal and intercalated cells of the collecting duct. Pflugers Arch - Eur J Physiol 470, 339–353 (2018). https://doi.org/10.1007/s00424-017-2084-x
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DOI: https://doi.org/10.1007/s00424-017-2084-x