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We took advantage of the fact that confluent MDCK cells can survive in a serum-free medium for several days to examine whether the upregulation of Na,K-ATPase by low K+ required serum. We found that serum was essential for low K+ to induce an increase in the cell surface Na,K-ATPase molecular number as quantified by ouabain binding assays. Further analyses identified that transferrin, not EGF or IGF-1,...
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