Abstract
Insulin was found to provoke simultaneous, rapid, biphasic increases in [3H]choline-labeling of phosphatidylcholine and phosphocholine in BC3H-1 myocytes. Phorbol esters increased [3H]choline-labeling of phosphocholine, but not phosphatidylcholine. Both agonists increased diacylglycerol production. These results suggest that: (a) insulin provokes coordinated increases in the synthesis and hydrolysis of PC; and, (b) insulin-induced activation of protein kinase C may activate a PC-specific phospholipase.
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