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- W2036444413 abstract "Detailed analyses of lipid composition have been made on various membrane fractions isolated at different intervals after 24 h-starved Tetrahymena cells were refed with nutrient-rich medium. During starvation there was a marked alteration in both phospholipid polar headgroup and acyl chain compositions: an increase in 2-aminoethylphospholipid and gamma-linolenic acid (18 : 3) with a concurrent decrease in phosphatidylethanolamine and palmitoleic acid (16 : 1). However, following refeeding, such an altered lipid composition was rather rapidly restored to the initial level of the control cell membranes prior to starvation. This membrane lipid modification was found to occur in good accordance with the recovery of cell size and lipid synthesis. The considerable changes in the principal unsaturated fatty acids, 16 : 1 and 18 : 3, which are formed via the palmitate and stearate desaturation pathways, respectively, were suggested to be accounted for by the levels of desaturases activities. The results of the labeling experiments with radioactive precursors have demonstrated that in the refed cells, there was a more rapid and dynamic transfer or exchange between membranes as compared with that in the exponentially growing control cells. Thus, rapid ameliorative modifications of membrane lipid composition are thought to be required for the urgent growth of membrane systems in the refed cell which should be ready to initiate new division." @default.
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- W2036444413 date "1980-12-01" @default.
- W2036444413 modified "2023-09-23" @default.
- W2036444413 title "Modifications of membrane lipid composition following the nutritional shift-up of starved cells a comparison with membrane biogenesis in Tetrahymena" @default.
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- W2036444413 doi "https://doi.org/10.1016/0005-2736(80)90380-6" @default.
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