Abstract
Na+/bicarbonate (HCO3 −) cotransporters (NBCs) are involved in maintaining both cellular and systemic pH homeostasis. Thus far, NBCs are found in the SLC4 gene family, which also includes Na+-independent anion exchangers. Of the ten SLC4 genes, five genes are Na+ bicarbonate cotransport systems: 2 electrogenic transporters, NBCe1 and 2 (SLC4A4 and A5); 2 electroneutral, NBCn1 and 2 (SLC4A7 and A8); and a Na+-driven Cl−/HCO3 − exchanger (NDCBE; SLC4A10). There are five NBCe1 isoforms: NBCe1-A (kidney isoform), NBCe1-B (pancreatic and general isoform), NBCe1-C (brain isoform), NBCe1-D, and NBCe1-E (unknown localization). Malfunction of NBCe1 transporters in epithelial cells leads to inappropriate bicarbonate transport and cellular buffering. In humans, recessive NBCe1 (SLC4A4; OMIM #603345) mutations cause development of proximal renal tubular acidosis (pRTA), cataracts, glaucoma, and defective tooth enamel with occasional occurrence of intestinal obstruction. This chapter will focus on physiological and pathological NBCe1 protein function in epithelial tissues, especially those resulting in human disease.
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Notes
- 1.
Δμ ion = RT•ln{[ion]inside/[ion]outside} + zFΔΨ.
- 2.
“z” is the net charge on a molecule, F is the Faraday constant, and ΔΨ = Ψ(inside) − Ψ(outside), which is also equal to the membrane potential (V m ).
- 3.
“R” is the gas constant, “T” is temperature in Kelvin degrees, and “ln” is the natural log.
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Acknowledgments
We thank our collaborators and past members of the Romero lab who contributed to some of the basic physiology. This work was supported by NIH EY017732 (MFR), the Cystic Fibrosis Foundation (Sindic-06F0, Romero-06G0), the Arlene and Robert Kogod Aging Center, and the Mayo Foundation.
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Sinđić, A., Romero, M.F. (2016). NBCe1, an Electrogenic Na+ Bicarbonate Cotransporter, in Epithelia. In: Hamilton, K., Devor, D. (eds) Ion Channels and Transporters of Epithelia in Health and Disease. Physiology in Health and Disease. Springer, New York, NY. https://doi.org/10.1007/978-1-4939-3366-2_13
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