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Abstract
The changes in contents of pancreatic carboxyl ester lipase, phospholipase A2, and lingual lipase in rats with streptozotocin (STZ)-induced diabetes have been studied. The contents of pancreatic carboxyl ester lipase and phospholipase A2 decreased by 40% and 45%, respectively, 5 days after injection of STZ, whereas pancreatic lipase steadily increased to 100% over control. The content of lingual lipase decreased sharply by more than 90% 2 days after STZ injection, followed by a tendency to recover slightly. Insulin treatment at a dose abolishing the urine glucose in diabetic rats for 3 days restored the contents of pancreatic lipase, carboxyl ester lipase, and lingual lipase but not pancreatic phospholipase A2. The results indicate that lack of insulin action induces an anticoordinate change in gastrointestinal lipolytic enzymes, with decreases in pancreatic carboxyl ester lipase, phospholipase A2, and lingual lipase contents and an increase in pancreatic lipase content.