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Creatine kinase activity and its isoenzymatic profile in rat intestinal mucose during normal development have been studied. Creatine kinase enzymatic activity increased stepwise during fetal development and the first week of life. An isoenzymatic pattern of exclusively CK-BB types occurred in all segments of the digestive tract during the early fetal stage. The isoenzyme profile of creatine kinase in the esophagic tissue with advancing maturation of the fetus shifted in the same way as in adults, with preferential concentration of CK-MM. However, CK-BB continued to be the main isoenzyme in the rest of the digestive tract. Our results show that rats are particularly suitable for experimental studies of intestinal creatine kinase isoenzymes.
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