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Bicarbonate secretion by rat bile duct brush cells indicated by immunohistochemical localization of CFTR, anion exchanger AE2, Na+/HCO3 − cotransporter, carbonic anhydrase II, Na+/H+ exchangers NHE1 and NHE3, H+/K+-ATPase, and Na+/K+-ATPase

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Abstract

The function of brush cells (BCs) is unknown. In a previous study, the rat common bile duct was examined by ultrastructural cytochemical methods for localizing HCO3 −, Cl−, and Na+ ions. All ion precipitates increased in or on BCs after secretin or meal stimulation, and it was proposed that BCs may secrete NaHCO3. In this study, immunohistochemical localization of proteins known to be important in HCO3 − secretion was investigated in the rat common bile duct. Immunoreactivity of proteins involved in Cl−/HCO3 − exchange reaction, cystic fibrosis transmembrane conductance regulator (CFTR) and Cl−/HCO3 − exchanger (AE2), was found on the microvilli (MV) and along the basolateral membrane (BLM) of BCs. The proteins involved in HCO3 − production, Na+/HCO3 − cotransporter (NBC), was found along the BLM but was absent on the MV, whereas carbonic anhydrase II (CA II) was observed on the MV and along the BLM. Of proteins responsible for the extrusion of H+, Na+/H+ exchanger 1 (NHE1) was localized along the BLM whereas Na+/H+ exchanger 3 (NHE3) was found on the MV and BLM. Activity of H+/K+-ATPase was found along the BLM and on the MV, and Na+/K+-ATPase was localized along the BLM. The immunoreactivity of most of these proteins was absent or weak in principal cells. These results strongly suggest that BCs are a significant source of HCO3 − secretion.

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  1. Department of Surgery and Physiology, Kochi Medical School, Kohasu, Nankoku, Kochi, 783-8505, Japan

    Takuro Ogata

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Correspondence to Takuro Ogata.

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Ogata, T. Bicarbonate secretion by rat bile duct brush cells indicated by immunohistochemical localization of CFTR, anion exchanger AE2, Na+/HCO3 − cotransporter, carbonic anhydrase II, Na+/H+ exchangers NHE1 and NHE3, H+/K+-ATPase, and Na+/K+-ATPase. Med Mol Morphol 39, 44–48 (2006). https://doi.org/10.1007/s00795-006-0312-0

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