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The effects of adrenaline (0.5 microM) and the combination of adrenaline and insulin (1.7nM) on [6-14C]glucose metabolism were assessed in epididymal fat-pads from rats fed either a low- or high-fat diet. The response of lipolysis to adrenaline was clearly diminished in fat-fed rats. Insulin added to adrenaline inhibited the lipolysis by 50% regardless of the diet. Glucose utilization in adipose tissue of fat-fed rats was markedly stimulated by adrenaline (glucose uptake was increased 3-fold and the production of CO2 and the glycerol moiety of acylglycerol was increased 4-fold). However, adipose tissue from fat-fed rats was resistant to the effect of insulin to produce a further increase in adrenaline-stimulated glucose uptake. The intracellular capacity of lipogenesis on the one hand, and the production of CO2 and the glycerol moiety of acylglycerol on the other, are of prime importance in the action of insulin and adrenaline on glucose utilization in this model.

Adrenaline responsiveness of glucose metabolism in insulin-resistant adipose tissue of rats fed a high-fat diet