Abstract
1. Insulin increased basal 2-deoxyglucose uptake in isolated swine adipocytes by 75%. In the absence of insulin, isoproterenol did not inhibit basal 2-deoxyglucose transport. 2. Adenosine deaminase plus isoproterenol or theophylline alone reduced insulin effect by 10 and 40%, respectively. Isoproterenol alone or with 2-chloroadenosine did not inhibit insulin effect on glucose transport activity. 3. Insulin effect was inhibited by isoproterenol in the presence of theophylline but not in the presence of adenosine deaminase. 4. These results suggest that catecholamines do not counter-regulate basal and insulin-stimulated glucose transport in swine adipocytes.
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