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Human cystinotic fibroblasts were completely depleted of their accumulated intracellular free cystine within a 2-h time interval when exposed to culture medium containing between 1 and 5 mM mercaptoethylgluconamide. This cystine-depleting action of mercaptoethylgluconamide was observed with three different human cystinotic fibroblast cell lines and with all three cell lines, 2 mM mercaptoethylgluconamide was as effective as 1 mM cysteamine in depleting cells of their intracellular free cystine. Cell viability was excellent for cystinotic fibroblasts exposed to 2 mM mercaptoethylgluconamide for up to 6 days in duration. Mercaptoethylgluconamide (2 mM) was sufficiently stable under cell culture conditions such that a single addition of mercaptoethylgluconamide maintained cystine depletion in human cystinotic fibroblasts for at least a 4-day period. In contrast to cysteamine, 2 mM mercaptoethylgluconamide was not capable of depleting the cystine content of isolated cystinotic lysosomes, implying that cellular integrity is necessary to achieve cystine depletion by mercaptoethylgluconamide. The efficient cystine-depleting action of mercaptoethylgluconamide coupled with its lack of offensive odor encourage further investigation of this agent to possibly complement or supplant the use of cysteamine in the treatment of nephropathic cystinosis.

Utilization of Mercaptoethylgluconamide for Depleting Human Cystinotic Fibroblasts of their Accumulated Lysosomal Cystine