Journal of Lipid Research, Vol 17, 406-411, Copyright © 1976 by Lipid Research, Inc.
The effect of high sugar intake on the esterification of dihydroxyacetone phosphate by rat liver microsomes
RG Lamb and HJ Fallon
Rat liver microsomes were used as an enzyme source to study dietary-
induced changes in the rate of dihydroxyacetone phosphate esterification.
Rats were fed (1) 75% glucose or fructose diets for various time intervals,
or (2) fed a fractose diet for six days and then a chow diet. Both the
glucose and fructose diets produced a 2--3- fold increase in total and
neutral glycerolipid formation from dihydroxyacetone phosphate measured in
the presence of ATP, palmitate, CoA, and NADH. The increased rate of
dihydroxyacetone phosphate esterification and a simultaneous rise in serum
triglyceride level in rats fed fructose was rapidly reversed when chow was
substituted for the fructose. The results indicate that an increased rate
of dihyroxyacetone phosphate esterification may contribute to the
acceleration of endogenous glycerolipid biosynthesis noted under these
dietary conditions.