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Chronic uraemic rats had decreased food intake, and this was accompanied by decreased weight of the epididymal fat-pads and interscapular brown adipose tissue. Normal rats whose food intake was restricted to an amount similar to that of the uraemic rats showed similar decreases in weight of the adipose-tissue depots. In addition, the food-restricted rats had decreased liver weight compared with normal or uraemic rats. The basal rate of lipogenesis was decreased in liver and epididymal fat-pads of food-restricted and uraemic rats and in interscapular brown adipose tissue of uraemic rats. Administration of a low-glucose-containing (1.36%) peritoneal-dialysis solution slightly increased lipogenesis in liver of uraemic rats, but had no significant effect in epididymal fat-pads. For brown fat, the rate of lipogenesis was increased in normal, food-restricted and uraemic groups, but the values for the last group were 4-5-fold lower than for the food-restricted or control groups. A high-glucose-containing (3.86%) peritoneal-dialysis solution gave similar rates of lipogenesis in liver, epididymal fat-pads and brown fat of all three groups, but for brown fat moderately uraemic rats showed a considerably lower rate of lipogenesis than did mildly uraemic rats. The basal plasma insulin concentration was lower in the food-restricted (50%) and uraemic (70%) groups than in the control group. The low-glucose peritoneal-dialysis solution increased plasma insulin to control values in the food-restricted rats, but had no significant effect on plasma insulin in the uraemic rats, despite a significant increase in blood glucose in this group. It is concluded that there is an impairment of the lipogenic response to intraperitoneal glucose loads in interscapular brown adipose tissue of uraemic rats, and that this is not due to the accompanying decrease in food intake. The hypoinsulinaemia may be an important factor. The possible relevance of this finding to the obesity observed in some uraemic patients treated by peritoneal dialysis with glucose-containing solutions is discussed.

biochemical journal. cellular aspects

Effects of glucose-containing peritoneal-dialysis solutions on rates of lipogenesis <i>in vivo</i> in the liver, brown and white adipose tissue of chronic uraemic rats

Effects of glucose-containing peritoneal-dialysis solutions on rates of lipogenesis in vivo in the liver, brown and white adipose tissue of chronic uraemic rats