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• W2093619451 endingPage "030" @default.
• W2093619451 startingPage "015" @default.
• W2093619451 abstract "SLC26 family members are anionic transporters involved in Cl- and HCO3- absorption or secretion in epithelia. SLC26A9, preferentially expressed in the lung, is a poorly characterized member of this family. In this study, we investigated the transport properties of human SLC26A9 to determine its functional and pharmacological characteristics. SLC26A9 protein expression results in the appearance of an anionic current exhibiting an apparently linear current/voltage relationship and increases in 36Cl influxes and effluxes. The sequences of conductivity, Cl- >I- > NO3- ≧ gluconate > SO4 2- and selectivity (Px/PCI), I- > NO3- > Cl- > gluconate > SO42- are found. Cl- channel inhibitors DIDS and NS 3623 inhibit SLC26A9 associated currents while the specific CFTR inhibitor (CFTR(inh)-172) or glybenclamide has little effect. Elevation of intracellular cAMP (a CFTR activator) is also ineffective whereas increasing intracellular calcium blocks the SLC26A9 associated currents. The HCO3- conductance mediated by the SLC26A9 protein expression is low and no intracellular pHi changes are detectable under conditions favoring a Cl-/HCO3- exchange. However, the presence of HCO3-/CO2 stimulates the Cl--transporting activity of SLC26A9 in Xenopus laevis oocytes or SLC26A9-transduced COS-7 cells. As an important initial step in characterizing SLC26A9 function, we conclude that SLC26A9 is a Cl- channel and we suggest that HCO3- acts as a modulator of the channel. SLC26A9 physiological role in airway epithelia and its potential interaction with CFTR remain to be elucidated." @default.
• W2093619451 created "2016-06-24" @default.
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• W2093619451 date "2008-01-01" @default.
• W2093619451 modified "2023-10-15" @default.
• W2093619451 title "Characterization of SLC26A9, Facilitation of Cl^- Transport by Bicarbonate" @default.
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• W2093619451 doi "https://doi.org/10.1159/000149780" @default.
• W2093619451 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/18769029" @default.
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