Abstract
Exogenous glucagon or epinephrine were infused into normal overnight fasted dogs to raise circulating hormone levels to concentrations within the physiologic range. Plasma levels of glycerol and free fatty acids remained unchanged during the glucagon infusion, but rose significantly during the administration of epinephrine. Plasma insulin in the systemic circulation remained unchanged during the glucagon infusion and increased slightly during the infusion of thecatecholamine. The data suggest that in normal dogs glucagon in physiological amounts has no lipolytic effect. The importance of the sympathetic nervous system in regulating lipolysis in normal mammals is stressed.
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