Abstract
1. 1. The effect of starvation-refeeding transition and cold exposure on the activity of lipogenic enzymes in brown adipose tissue (BAT) and liver from rats was compared. 2. 2. Starvation caused a decrease of lipogenic enzyme activities in BAT and liver. 3. 3. Refeeding of the animals with a high carbohydrate diet caused an increase of lipogenic enzymes in these tissues. 4. 4. Cold exposure (4°C for 30 days) led to the increase of BAT enzyme activities to the values observed in rats fed a high carbohydrate diet. 5. 5. Under the same conditions the activity of hepatic lipogenic enzymes also increased but never reached the values observed in the liver of rats fed with a high carbohydrate diet. 6. 6. Therefore BAT and liver lipogenic enzymes showed, in general, a similar pattern of variation under identical nutritional conditions, but substantial differences between these two organs occurred as far as the response to cold exposure was concerned. 7. 7. The experiments also revealed that in the control animals BAT displayed a higher lipogenic potential than the liver.
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