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- W2029649188 abstract "The effects of sodium fluoride upon basal and agonist-stimulated inositol phospholipid breakdown have been investigated in rat brain miniprisms. NaF concentration dependently increased basal inositol phospholipid breakdown, with a maximum effect being seen at 20 mM. NaF reduced the inositol phospholipid breakdown responses to stimulation by carbachol, noradrenaline, serotonin and quisqualate, but not to the stimulation produced by raising the assay [K+] from 6 to 18 mM. More detailed study demonstrated NaF to have a 'levelling' effect, reducing all InsP/(Lipid + InsP) values greater than 0.15 (i.e. produced by carbachol at raised [K+], noradrenaline and by 50 mM K+) to about this value. Time-course experiments indicated that NaF treatment reduced the rate of carbachol-stimulated inositol phospholipid breakdown up to this InsP/(Lipid + InsP) level and thereafter blocked further breakdown. Inhibitory effects upon carbachol-stimulated inositol phospholipid breakdown were not seen with forskolin, sodium nitroprusside or 8BrcGMP. Under conditions where there is no de novo synthesis of phosphoinositides from [3H]myo-inositol, NaF reduced the total Lipid + InsP labelling by about 20%. NaF in addition inhibits the activity of Ins(1,4)P2-phosphatase in cerebral cortical homogenates. It is concluded that fluoride ions inhibit agonist-stimulated inositol phospholipid breakdown via actions not only on G-proteins but also on phosphoinositide-specific phospholipase C substrate availability." @default.
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- W2029649188 date "1990-12-01" @default.
- W2029649188 modified "2023-10-03" @default.
- W2029649188 title "Multiple actions of fluoride ions upon the phosphoinositide cycle in the rat brain" @default.
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- W2029649188 doi "https://doi.org/10.1016/0006-8993(90)90344-b" @default.
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