Parsing apical oxalate exchange in Caco-2BBe1 monolayers: siRNA knockdown of SLC26A6 reveals the role and properties of PAT-1.

ABSTRACT: The purpose of this investigation was to quantitate the contribution of the anion exchanger PAT-1 (putative anion transporter-1), encoded by SLC26A6, to oxalate transport in a model intestinal epithelium and to discern some characteristics of this exchanger expressed in its native environment. Control (Con) Caco-2 BBe1 monolayers, 6-8 days postseeding, were compared with those transfected with a small interfering RNA targeted to SLC26A6 (A6KD). Radiotracer and Ussing chamber techniques were used to determine the transepithelial unidirectional fluxes of Ox(2-), Cl(-), and SO(4)(2-) whereas fluorometric/BCECF measurements of intracellular pH were used to assess HCO(3)(-) exchange. PAT-1 was functionally targeted to the apical membrane, and SLC26A6 knockdown reduced PAT-1 protein (>60%) and m

SUBMITTER: Freel RW 

PROVIDER: S-EPMC2777456 | biostudies-literature | 2009 Nov

REPOSITORIES: biostudies-literature