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  • Title: An electroneutral anion exchange mechanism is present in brush-border membranes isolated from eel kidney.
    Author: Vilella S, Ingrosso L, Zonno V, Schettino T, Storelli C.
    Journal: Am J Physiol; 1997 Apr; 272(4 Pt 2):R1143-8. PubMed ID: 9140013.
    Abstract:
    The mechanism of bicarbonate translocation across the luminal membrane of the eel (Anguilla anguilla) kidney tubular cells was studied by monitoring the uptake of H14CO3- into isolated brush-border membrane vesicles. Results indicate that the presence of a transmembrane outwardly directed Cl- gradient was able to transiently accumulate H14CO3- into the vesicular space, whereas neither an inwardly directed sodium gradient nor a transmembrane electrical potential gradient (inside positive) was able to stimulate the H14CO3- influx. This anion-dependent H14CO3- uptake was inhibited by 4,4'-diisothiocyanostilbene-2,2'-disulfonic acid, suggesting that an anion exchanger was present in the brush-border membrane vesicles.
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