Differential Effects of Dietary Excessive Cystine and Cysteine on Plasma Ceruloplasmin and Cholesterol in Rats

Abstract

This study was designed to compare the influences of dietary addition of 2% L-cystine and 2% L-cysteine on plasma ceruloplasmin and cholesterol in rats. The result showed that cystine addition depressed plasma ceruloplasmin activity and increased plasma cholesterol, while cysteine addition did not. This study provides the first evidence indicating the differencial metabolic responses to dietary addition of 2% cystine and cysteine.