Abstract
We assayed various lipid fractions as well as some intermediate metabolites and adenine nucleotides in the liver and the blood of the genetically obese Zucker rat (fa/fa) and compared their values with the corresponding ones obtained for nonobese controls and for Sprague-Dawley rats. Results for the two latter groups were similar, and differed greatly from those for the obese rats. The obese rats had hepatomegaly due mainly to high levels of triglycerides. The plasma of the obese animals contained high levels of triglycerides, phospholipids, cholesterol, and nonesterified fatty acids. Obese rats had slightly higher levels of ketone bodies than nonobese rats. In the liver of obese rats, we observed a decreased level of citrate/g and an elevated malate level. Levels of adenine nucleotides were similar in all rats.
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