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- W2149039618 abstract "Barrier function and transepithelial transport are intimately linked and are sometimes disturbed in parallel. DRA (downregulated in adenoma) is an intestinal chloride/bicarbonate exchanger that is functionally coupled to CFTR (cystic fibrosis transmembrane regulator) in the upper gastrointestinal tract to mediate chloride and bicarbonate secretion and to NHE3 (Na/H exchanger‐ isoform 3) in the lower gastrointestinal tract to mediate electroneutral NaCl absorption. All three transport proteins possess PDZ domain binding motifs that facilitate binding to members of the NHERF (Na/H exchanger regulatory factor) family of adapter proteins [NHERF, E3KARP (NHE3 kinase A regulatory protein), PDZK1 (PDZ protein kidney 1) and IKEPP (intestinal and kidney enriched PDZ protein)]. Regulation of DRA appears to depend on the presence of a partner transport protein, and this may involve the assembly of different complexes of transporters, adapter proteins, and signaling molecules. We have established stable expression of DRA in HEK cells. In these cells, that do not express significant amounts of CFTR or NHE3, DRA is inhibited by intracellular calcium but not by protein kinase C or protein kinase A. At high calcium concentrations induced by 4Br‐A23187 this inhibition is independent of the PDZ interaction of DRA. These data show that DRA can be individually regulated and may be confirmed in a more physiologically relevant expression system (i.e., Caco‐2/BBE cells) using natural agonists of the intracellular calcium signal." @default.
- W2149039618 created "2016-06-24" @default.
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- W2149039618 date "2009-05-01" @default.
- W2149039618 modified "2023-10-18" @default.
- W2149039618 title "Regulation of the Intestinal Anion Exchanger DRA (Downregulated in Adenoma)" @default.
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- W2149039618 doi "https://doi.org/10.1111/j.1749-6632.2009.04044.x" @default.
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