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Active phosphate ion transport in plasma membrane vesicles isolated from mouse fibroblasts.
Inorganic phosphate accumulated 8-fold in plasma membrane vesicles derived from simian virus 40-transformed 3T3 mouse fibroblasts when a NaCl gradient (external greater than internal) was artificially imposed across the membrane. Preincubation with Na+ or addition of monensin markedly reduced phosphate accumulation. Na+-stimulated phosphate transport was not affected by addition of either dicarboxylic acids, antimycin A, or ouabain and persisted after addition of proton ionophores. The coupling of phosphate transport to Na+ gradients was pH-dependent, with maximal stimulation by Na+ below pH 7. These findings suggest that monovalent phosphate anion moves across the plasma membrane in co-transport with sodium ion.[1]References
- Active phosphate ion transport in plasma membrane vesicles isolated from mouse fibroblasts. Lever, J.E. J. Biol. Chem. (1978) [Pubmed]
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