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- W1994706201 abstract "Little is known concerning the effects of Na+-coupled solute transport on (Na+, K+)-ATPase mediated cation pumping in the intact cell. We investigated the effect of amino acid transport and growth factor adition on the short term regulation of (Na+, K+)-ATPase cation transport in HeLa cells. The level of pump activity in the presence of amino acids or growth factors was compared to the level measured in phosphate buffered saline. These rates were further related to the maximal pump capacity, operationally defined as ouabain inhibitable 86Rb+ influx in the presence of 15 μM monensin. Of the growth factors tested, only insulin was found to moderately (22%) increase (Na+, K+)-ATPase cation transport. The major determinant of pump activity was found to be the transport of amino acids. Minimal essential medium (MEM) amino acids increased ouabain inhibitable 86Rb+ influx to a level close to that obtained with monensin, indicating that the(Na+, K+ )-ATPase is operating near maximal capacity during amino acid transport. This situation may apply to tissue culture conditions and consequently measurements of (Na+, K+)-ATPase activity in buffer solutions alone may yield little information about cation pumping under culture conditions. This finding applies especially to cells having high rates of amino acid transport. Furthermore, rates of amino acid transport may be directly or indirectly involved in the long-term regulation of the number of (Na+, K+)-ATPase molecules in the plasma membrane." @default.
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- W1994706201 date "1986-10-01" @default.
- W1994706201 modified "2023-09-29" @default.
- W1994706201 title "Na+-dependent amino acid transport is a major factor determining the rate of (Na+, K+)-ATPase mediated cation transport in intact HeLa cells" @default.
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- W1994706201 doi "https://doi.org/10.1002/jcp.1041290113" @default.
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