EFFECT OF FEEDING AMINO ACID MIXTURES ON LIPID TRANSPORT FROM RAT LIVER AS MEASURED BY LIVER PERFUSION

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The present study examined lipid transport from the liver by application of a perfusion technique in situ in rats fed diets consisting of a low level Wheat- or Rice- or Miyazaki-pattern amino acid mixture. The net release of hepatic lipids was directly estimated from analysis of the perfusate continuously circulated through the liver. The net release of triacylglycerol from the liver into the perfusate was much more severely inhibited in the Wheat-pattern diet group, and more depressed in the Rice-pattern diet group than in the control group, and slightly reduced in the Miyazaki-pattern diet group compared with the control. For serum lipoproteins fractionated by the Quick-Disc electrophoresis method, there was a significant decrease in the serum pre-β lipoprotein fraction in all the rats of the Wheat-, Rice- and Miyazaki-pattern diet groups compared with the control. These observations provide firm support for the hypothesis that in rats given diets consisting of a low level of the Wheat-, Rice- and Miyazaki-pattern amino acid mixture, fatty liver may be produced mainly by an impaired transport of triacylglycerols from the liver.
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