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• W57370797 abstract "1. Addition of the bivalent ionophore A23187 to synaptosomes isolated from guinea-pig brain cortex and labelled with [(32)P]phosphate in vitro or in vivo caused a marked loss of radioactivity from phosphatidyl-myo-inositol 4-phosphate (diphosphoinositide) and phosphatidyl-myo-inositol 4,5-bisphosphate (triphosphoinositide) and stimulated labelling of phosphatidate. No change occurred in the labelling of other phospholipids. 2. In conditions that minimized changes in internal Mg(2+) concentrations, the effect of ionophore A23187 on labelling of synaptosomal di- and tri-phosphoinositide was dependent on Ca(2+) and was apparent at Ca(2+) concentrations in the medium as low as 10(-5)m. 3. An increase in internal Mg(2+) concentration stimulated incorporation of [(32)P]phosphate into di- and tri-phosphoinositide, whereas lowering internal Mg(2+) decreased labelling. 4. Increased labelling of phosphatidate was independent of medium Mg(2+) concentration and apparently only partly dependent on medium Ca(2+) concentration. 5. The loss of label from di- and tri-phosphoinositide caused by ionophore A23187 was accompanied by losses in the amounts of both lipids. 6. Addition of excess of EGTA to synaptosomes treated with ionophore A23187 in the presence of Ca(2+) caused a rapid resynthesis of di- and tri-phosphoinositide and a further stimulation of phosphatidate labelling. 7. Addition of ionophore A23187 to synaptosomes labelled in vivo with [(3)H]inositol caused a significant loss of label from di- and tri-phosphoinositide, but not from phosphatidylinositol. There was a considerable rise in labelling of inositol diphosphate, a small increase in that of inositol phosphate, but no significant production of inositol triphosphate. 8. (32)P-labelled di- and tri-phosphoinositides appeared to be located in the synaptosomal plasma membrane. 9. The results indicate that increased Ca(2+) influx into synaptosomes markedly activates triphosphoinositide phosphatase and diphosphoinositide phosphodiesterase, but has little or no effect on phosphatidylinositol phosphodiesterase." @default.
• W57370797 created "2016-06-24" @default.
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• W57370797 date "1978-11-15" @default.
• W57370797 modified "2023-10-18" @default.
• W57370797 title "Calcium-activated hydrolysis of phosphatidyl-<i>myo</i>-inositol 4-phosphate and phosphatidyl-<i>myo</i>-inositol 4,5-bisphosphate in guinea-pig synaptosomes" @default.
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• W57370797 doi "https://doi.org/10.1042/bj1760541" @default.
• W57370797 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/1186263" @default.
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