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• W1503582968 abstract "The mitogenic effect of thyrotropin on functional rat thyroid cells of the line FRTL-5 is correlated with membrane lipid fluidity as evaluated by fluorescence polarization of 1,6-diphenyl-1,3,5-hexatriene. Continued exposure of FRTL-5 cells to a medium lacking thyrotropin causes cessation of cell proliferation and a decrease in membrane lipid fluidity which reaches its minimum in approximately 8 days. The change in lipid fluidity is due to an absolute increase (greater than 2-fold) of membrane cholesterol, with an increased cholesterol/phospholipid ratio and an increased ratio of saturated to unsaturated fatty acids of the membrane phospholipids, contributed primarily by a nearly 4-fold increase in the ratio of saturated to unsaturated C16 fatty acids. It is also associated with a variation of the relative proportions of the major membrane phospholipids; thus, phosphatidylinositol and phosphatidylethanolamine decrease while phosphatidylcholine increases. Both membrane fluidity and lipid composition can be restored by thyrotropin to their original levels, i.e. levels measured under continuous exposure to the hormone. Complete reversal requires at least 48 h, i.e. approximately the same time required for resumption of growth when FRTL-5 cells, starved in thyrotropin, are re-exposed to the hormone. Changes in lipid composition and fluidity can be prevented or can be reversed if FRTL-5 cells are exposed to dibutyryl cAMP while being deprived of thyrotropin. Dibutyryl cAMP has only a modest direct effect on growth; however, this pretreatment eliminates the 48-h lag phase with respect to thyrotropin stimulation. It is proposed that the effects of thyrotropin on growth of FRTL-5 cells requires a modification of the molecular structure and the physical state of cell membranes, which can be mediated by cAMP, although cAMP is not sufficient by itself to promote growth." @default.
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• W1503582968 date "1987-02-01" @default.
• W1503582968 modified "2023-10-18" @default.
• W1503582968 title "Thyrotropin regulation of membrane lipid fluidity in the FRTL-5 thyroid cell line. Its relationship to cell growth and functional activity." @default.
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• W1503582968 doi "https://doi.org/10.1016/s0021-9258(19)75674-9" @default.
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