Jul 1, 1976

Comparative effects of fructose and glucose on the lipid and carbohydrate metabolism of perfused rat liver

The British Journal of Nutrition
D L Topping, P A Mayes

Abstract

1. Livers from rats fed on a standard diet were perfused with whole blood, and infused continuously with glucose and fructose at equimolar rates. 2. Infusion of fructose increased both the secretion of very-low-density-lipoprotein (VLDL)-triglycerides and the incorporation of free fatty acids (FFA) from the perfusate into VLDL-lipids, but neither of these two processes was affected by infusion of glucose. 3. Infusion of fructose decreased the oxidation and increased the esterification of FFA, but glucose infusion had no effect on these processes. When fructose and glucose were infused together was a further decrease in oxidation. 4. When fructose was infused alone or together with glucose, blood concentrations rapidly became stabilized at those found in the hepatic portal vein in vivo, with similar rates of hepatic uptake to those found in the intact animal. Infusion of glucose alone resulted in continuously increasing perfusate glucose concentrations, and rates of uptake which were only 20% of those for fructose. Blood glucose concentrations were reduced, and lactate concentrations were increased by fructose infusion, and when glucose and fructose were infused together there was a greatly increased rate of glucose uptake. 5. L...Continue Reading

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Mentioned in this Paper

Metabolic Process, Cellular
Lactate
Whole Blood
Fructose
Uptake
Portal Vein Structure
Hepatic
Glucose, (beta-D)-Isomer
Liver Glycogen
VLDL Cholesterol Measurement

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