Fibroblasts transformed with v-src show enhanced formation of an inositol tetrakisphosphate

Science
R M JohnsonJ C Garrison

Abstract

The tyrosine kinase pp60v-src, encoded by the v-src oncogene, seems to regulate phosphatidylinositol metabolism. The effect of pp60v-src on control points in inositol phosphate production was examined by measuring the amounts of inositol polyphosphates in Rat-1 cells expressing wild-type or mutant forms of the protein. Expression of v-src-resulted in a five- to sevenfold elevation in the steady-state amount of an isomer of inositol tetrakisphosphate, whereas the concentrations of inositol trisphosphates or other inositol tetrakisphosphates were not affected. The activity of a key enzyme in the formation of inositol tetrakisphosphates, inositol (1,4,5)-trisphosphate 3-kinase, was increased six- to eightfold in cytosolic extracts prepared from the v-src-transformed cells, suggesting that this enzyme may be one target for the pp60v-src kinase and that it may participate in the synthesis of novel, higher order inositol phosphates.

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