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Inhibition of PI-kinase in rat liver membranes by F-
1Department of Biochemistry, University of Cambridge, U.K.
Abstract:
In a number of membrane preparations GTP or its non-hydrolysable analogues stimulate the breakdown of PIP2 generating the second messengers, inositol triphosphate and diacylglycerol. The G-protein which couples the PIP2-specific phospholipase C with the receptors can also be activated by F-. However, the level of PIP2 is dependent upon the activity of a number of enzymes in the PI-pathway. Besides stimulating the breakdown of PIP2, we report that in rat liver membranes F- also decreases the labelling of the polyphosphoinositides through inhibition of the PI-kinase.
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