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Effect of Bathocuproine Disulfonate, a Copper Chelator, on Cyst(e)ine Metabolism by Freshly Isolated Rat Hepatocytes

Effect of Bathocuproine Disulfonate, a Copper Chelator, on Cyst(e)ine Metabolism by Freshly Isolated Rat Hepatocytes

R M Coloso, M R Drake, M H Stipanuk

Am J Physiol. 1990 Sep;259(3 Pt 1):E443-50.

PMID: 2399977

Abstract:

The metabolism of L-cysteine was studied in freshly isolated rat hepatocytes. Because cysteine is rapidly oxidized in oxygenated incubation medium at neutral pH, the effect of bathocuproine disulfonate, a copper-specific chelator, was investigated. Addition of bathocuproine disulfonate resulted in a higher extracellular cysteine-to-half-cystine ratio in incubations of hepatocytes with cysteine. Bathocuproine disulfonate also increased the total uptake and metabolism of cysteine plus cystine [cyst(e)ine] by hepatocytes, which is consistent with the more efficient transport of cysteine than of cystine by freshly isolated rat hepatocytes. The partitioning of cysteine between cysteinesulfinate-dependent and cysteinesulfinate-independent pathways of catabolism was also altered by the addition of bathocuproine disulfonate; the percentage of total catabolic flux that resulted in taurine plus hypotaurine formation was greater, and the percentage of total catabolic flux that occurred by the beta-cleavage of cystine in a reaction catalyzed by gamma-cystathionase was less in incubations that contained bathocuproine disulfonate. Thus addition of bathocuproine disulfonate to maintain a higher extracellular thiol-to-disulfide ratio favored cysteinesulfinate-dependent catabolism of cysteine in rat hepatocytes.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP4733395	Bathocuproine		4733-39-5	Price

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