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• W2078136639 abstract "Cultured ascites tumor cells and their lipid-depleted variants containing 35-40% less membrane phospholipid and cholesterol were used to study uptake and metabolism of fatty acids complexed to albumin. Uptake of stearate and oleate at 37 degrees C was considerably higher in the lipid-depleted cells, but no significant difference in the affinity constants for stearate uptake of 3.70 microM for the lipid-depleted and 2.50 microM for the control cells was observed. Similar rates of uptake of both cultures were observed at lower temperatures up to 30 degrees C. The drastic increase in stearate uptake above 30 degrees C resulted in an endothermic transition in the Arrhenius plot with an activation energy of 20.8 kJ/mol versus 6.5 kJ/mol for the control cells. Uptake of stearate and oleate of the control cells was only slightly reduced by metabolic inhibitors, which was similar to stearic acid transport in the lipid-depleted variants. However, oleate uptake was substantially decreased in these variants. Incorporated stearate was esterified to about 50% in both cultures, and oleate between 85 and 90%. Mainly triacylglycerols and phospholipids with phosphatidylcholine (41%) and phosphatidylethanolamine (35%) as major polar lipid components, and also lower acylglycerols and cholesterol were found to be labeled. Under lipid-depleted conditions, a pronounced increase in the relative proportion of oleate incorporation into triacylglycerols was determined. It is suggested that fatty acid uptake is controlled by the number of active sites of the putative transport protein, which increases upon lipid depletion as shown from the V values. This increase may result from the segregation of membrane-bound proteins into domains (Haeffner et al. (1986) Cell Mol. Biol. 32, 359-368), which are known to be formed as a consequence of lipid phase separation in the lipid-depleted cells." @default.
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• W2078136639 date "1989-09-01" @default.
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• W2078136639 title "Induction of an endothermic transition in the Arrhenius plot of fatty acid uptake by lipid-depleted ascites tumor cells" @default.
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• W2078136639 doi "https://doi.org/10.1016/0005-2760(89)90027-1" @default.
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