We have characterized a Ca2+-dependent Cl− current (ClCa) in cultured Sertoli cells from immature rat testis by using the whole cell recording patch-clamp technique. Cells dialyzed with pipette solutions containing 3 mm adenoside-triphosphate (ATP) and 1 μm free Ca2+, exhibited outward currents which were inhibited by 4,4′-diisothiocyanatostilbene-2,2′-disulfonic acid (DIDS) and anthracene-9-carboxylic acid (9-AC) but insensitive to tetraethylammonium (TEA). Dialysis of cells with pipette solutions containing less than 1 nm free Ca2+ strongly reduced the currents indicating that they were Ca2+ dependent. With cells dialyzed with Cs+ glutamate-rich pipette solutions containing 0.2 mm EGTA, 10 μm ionomycin induced outward currents having properties of Ca2+-activated Cl− currents.
The Journal of Membrane Biology – Springer Journals
Published: Jun 1, 1999
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