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- W2055989575 abstract "We have studied the ontogeny of Na-K ATPase-mediated Na and K transport in rat renal proximal tubular cells using electron probe analysis. The cells were cultured from kidneys of 10-day-old, young (Y), and 40-day-old, adult (A) rats. Before an experiment cells were Na-loaded and K-dcpleted by incubation in K-free medium. The maximum rate of ouabain-sensitive Na and K transport was measured after reactivating the Na-K pump by transferring the cells from K-free medium to medium containing 5 mM K. In cells cultured for 2 days, ouabain-sensitive Na and K net initial transport rates were significantly higher in A than in Y cells. Between 2 and 4 days in culture there was a significant decrease in ouabain-sensitive Na and K transport rates in both Y and A cells. From 2 to 4 days of culture there was, in Y but not in A cells, a significant decrease in K/Na ratio. The decrease in K/Na ratio was due to a significant increase in Na content. After incubation in K-free medium, net intracellular solute accumulation was observed in A and Y cells cultured for 4 days but not in A and Y cells cultured for 2 days. In conclusion, maximal Na- and K-pump-mediated transport increases during terminal differentiation. This increase can be measured in cells cultured for 2 days. With longer time in culture, Na K pump activity decreases and the difference between A and Y cells is not measurable. We had previously observed that net Na and K permeabilities decrease from 2 to 4 days in culture in A but not in Y cells. In Y cells cultured for 4 days, a decrease in pump activity without a change in Na and K permeability causes an increase in intracellular Na content." @default.
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- W2055989575 date "1988-02-01" @default.
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- W2055989575 title "Studies on terminal differentiation of rat renal proximal tubular cells in culture: ouabain-sensitive K and NA transport" @default.
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- W2055989575 doi "https://doi.org/10.1111/j.1748-1716.1988.tb08309.x" @default.
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