Abstract
ClC-5 chloride channels and epithelial sodium channels (ENaC) are present in many cell types including airway and retinal epithelia. Since ENaC activity is known to be affected by chloride transport, we co-injected Xenopus oocytes with cRNAs encoding ENaC and ClC-5 to investigate whether channel currents are impacted by heterologous co-expression of these proteins. ClC-5 currents were not detectably affected by co-expression with ENaC, whereas amiloride-sensitive ENaC currents were significantly lower compared to control oocytes expressing ENaC alone. Co-expression of ENaC with cRNA sequences encoding non-conducting fragments of ClC-5 revealed that the amino acid sequence region between positions 347 and 647 was sufficient for inhibition of ENaC currents. Co-expression of ENaC and another transport protein, the sodium dicarboxylate co-transporter (NaDC-1), did not affect ENaC currents. To test whether the inhibitory effects of ClC-5 were specific for ENaC, ClC-5 was also co-expressed with CFTR. CFTR currents were also inhibited by co-expression with ClC-5, whereas ClC-5 currents were unaffected. Western blot analysis of biotinylated oocyte surface membranes revealed that the co-expression of ClC-5 with ENaC, CFTR, or NaDC-1 decreased the abundance of these proteins at the surface membrane. We conclude that overexpression of ClC-5, specifically amino acids 347–647, can alter the normal translation or trafficking of ENaC and other ion transport proteins by a mechanism that is independent of the chloride conductance of ClC-5.
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Acknowledgements
We are indebted to Dr. Thomas Jentsch for donation of human ClC-5, Drs. Bernard Rossier, and Alex Puoti for Xenopus ENaC subunits, Dr. Cecilia Canessa for rat ENaC constructs, and Dr. Mouhamed Awayda for HA-tagged αENaC cDNA. Thanks also to Hong Sun for technical support. We are grateful to Dr. Ana Pajor for providing the rabbit Na+/dicarboxylate cotransporter NaDC-1, anti-NaDC-1 antibody, and related advice and assistance, and for reading a preliminary version of this manuscript. This work was supported by the John Sealy Memorial Endowment for Biomedical Research and NIH grant # DK53352 to N.W.
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Mo, L., Wills, N. ClC-5 Chloride Channel Alters Expression of the Epithelial Sodium Channel (ENaC). J Membrane Biol 202, 21–37 (2004). https://doi.org/10.1007/s00232-004-0717-4
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DOI: https://doi.org/10.1007/s00232-004-0717-4