Abstract
The effect of acetylcholine on the incorporation of P(32) into the individual phosphatides in slices of various structures of the nervous system has been studied. There was a marked stimulation of P(32) incorporation into phosphoinositide and phosphatidic acid, but not into phosphatidyl choline and phosphatidyl ethanolamine, in the cat stellate and celiac ganglia in vitro. Acetylcholine stimulated P(32) incorporation into certain phosphatides, primarily phosphoinositide and phosphatidic acid, in several structures of the cat and guinea pig brain; there was little or no effect of acetylcholine on phosphatide turnover in the inferior corpora quadrigsemina and cerebellar cortex. The suggestion is made that the phospholipid effect can best be explained as being concerned with the active transport of sodium ions out of the cell across the postsynaptic membrane of cholinergic neurons in response to acetylcholine.
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