Abstract
Diabetes was induced by the administration of streptozotocin (55 mg/kg or 70 mg/kg) to rats. After 21-25 days, myocardial cells (myocytes) were isolated from control and diabetic rat hearts. Rates of endogenous lipolysis, measured as the output of glycerol, were elevated in the chronically diabetic myocytes. Lipoprotein lipase activity was reduced in homogenates of diabetic myocytes. Neutral triacylglycerol lipase activity was increased in myocytes from rats made diabetic with the lower dose of streptozotocin, but not in myocytes from diabetic rats given the higher dose. Diabetes had no effect on acid lysosomal lipase activity.
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