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- W2034632575 abstract "The treatment of cerebral cortex slices with substance P caused alterations in the phospholipid levels. A significant loss of phosphatidylinositol in a dose-dependent manner was observed. In contrast, the levels of the major phospholipids, phosphatidylcholine and phosphatidylethanolamine, were enhanced by the peptide. The effect of substance P on the fatty acid composition of phospholipids was also studied. The most relevant event was the decrease in the content of both stearic and arachidonic acids of phosphatidylinositol. This decrease was more evident at the lowest substance P concentration tested (65 pM). These results are consistent with the phosphatidylinositol breakdown caused by substance P in some tissues. Furthermore, our data indicate that this breakdown is selective depending on the peptide dose. Thus, in the presence of very low doses of substance P (65 pM) a preferential degradation of 1-acyl(predominantly stearoyl)-2-arachidonoylglycerophosphoinositol molecular species occurs, whereas high doses of the peptide (0.65 microM) induce a generalized hydrolysis of phosphatidylinositol without showing any preference towards molecular species rich in arachidonic acid. Hence we describe for the first time a dual, dose-dependent mechanism for phosphatidylinositol hydrolysis by substance P, suggesting the possibility that either phospholipase A2 or phospholipase C activation is involved." @default.
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- W2034632575 date "1988-03-01" @default.
- W2034632575 modified "2023-10-17" @default.
- W2034632575 title "Dual mechanism of phosphatidylinositol hydrolysis by substance P in brain" @default.
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- W2034632575 doi "https://doi.org/10.1111/j.1432-1033.1988.tb13924.x" @default.
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