Abstract
In order to obtain further information on the changes in liver lipids, either a basal or a lysineexcess diet was refed to previously starved rats or fed to previously non-starved rats. Liver lipid accumulation was observed in previously starved rats refed the lysine-excess diet for 7 days, but not in rats without previous starvation. The liver lipid did not accumulate with another 8 days' feeding (15 days' refeeding). The addition of methionine alone or in combination with threonine to the lysineexcess diet had no effect on the liver lipid level. The decrease in serum triacylglycerol in rats refed the lysine-excess diet was preceded by lipid accumulation in the liver. Urinary potassium during the initial two days increased with refeeding and feeding. Marked excretion of orotate was observed for 2 days from the initiation of refeeding of the lysine-excess diet and it then decreased. Thus, such a marked increase in the urinary excretion of orotate might be associated with the stimulation of orotate biosynthesis and with lipid accumulation in the liver.
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