Abstract
The induction of the enzyme creatine phosphokinase (CPK) in cultures of chick breast muscle myoblasts has been distinguished from the process of fusion of myoblasts resulting in the formation of multinucleated myotubes. Primary cultures of myoblasts grown in the presence of phospholipase C, BUdR or EGTA, all of which prevent cell fusion, contain amounts of CPK similar to the level in untreated cultures. Both the brain and muscle isozymes are present in all cultures. We conclude that the induction of CPK is not dependent upon the formation of multinucleated myotubes.
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