Metabolism of sheep adipose tissue in vitro

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Abstract
The metabolism of the large mass of depot adipose tissue constituting the tail of the Syrian sheep was studied in vitro and compared to the rat epididymal pad fat similarly processed. Oxygen and glucose uptake by tail adipose tissue was less than half that of the epididymal pad fat. Insulin caused only a slight increase in glucose uptake by tail adipose tissue. Incorporation of radioactive glucose into CO2 and lipids was equal, and CO2 production from carbon 1 of glucose was greater than from carbon 6. Insulin had a minimal stimulatory effect on these parameters. Basal free fatty acid liberation by tail adipose tissue was small compared to rat epididymal pad fat and the release was only slightly increased by adrenaline [epinephrine] and noradrenaline [norepineph-rine]. Glycerol measurements again failed to show a significant lipolytic effect of catecholamines. No glycerokinase activity could be detected. These findings support the previously reported in vivo findings on the sheep adipose tissue and further emphasize the species differences in the metabolism of adipose tissue.

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