Abstract
Many anion channels, frequently referred as Cl− channels, are permeable to different anions in addition to Cl−. As the second-most abundant anion in the human body, HCO3− permeation via anion channels has many important physiological roles. In addition to its classical role as an intracellular pH regulator, HCO3− also controls the activity and stability of dissolved proteins in bodily fluids such as saliva, pancreatic juice, intestinal fluid, and airway surface liquid. Moreover, HCO3− permeation through these channels affects membrane potentials that are the driving forces for transmembrane transport of solutes and water in epithelia and affect neuronal excitability in nervous tissue. Consequently, aberrant HCO3− transport via anion channels causes a number of human diseases in respiratory, gastrointestinal, genitourinary, and neuronal systems. Notably, recent studies have shown that the HCO3− permeabilities of several anion channels are not fixed and can be altered by cellular stimuli, findings which may have both physiological and pathophysiological significance. In this review, we summarize recent progress in understanding the molecular mechanisms and the physiological roles of HCO3− permeation through anion channels. We hope that the present discussions can stimulate further research into this very important topic, which will provide the basis for human disorders associated with aberrant HCO3− transport.
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Acknowledgments
The authors would like to thank Dong Soo Jang and the Medical Illustration & Design at Yonsei University for providing excellent support with medical illustrations.
Funding
This work was funded by grants 2013R1A3A2042197 (MGL) and 2020R1C1C1009363 (DHS) from the Basic Research Program and grants 2016M3A9B5941215 and 2019M3E5D5066690 (JJ) from the Bio & Medical Technology Program of the National Research Foundation of Korea, funded by the Korean government (MSIT & MOHW), and by the National Institutes of Health, USA, awards P41GM103712 and P30DA035778 (MHC).
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DHS and MGL designed and wrote the first draft of the manuscript. MK, YK, IJ, JJ, and JHN discussed, amended, and finalized the manuscript. MHC developed the model for WNK1-CFTR interaction.
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Shin, D.H., Kim, M., Kim, Y. et al. Bicarbonate permeation through anion channels: its role in health and disease. Pflugers Arch - Eur J Physiol 472, 1003–1018 (2020). https://doi.org/10.1007/s00424-020-02425-x
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DOI: https://doi.org/10.1007/s00424-020-02425-x