Effect of bathocuproine disulfonate, a copper chelator, on cyst(e)ine metabolism by freshly isolated rat hepatocytes.
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| 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.
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| Authors | R M Coloso, M R Drake, M H Stipanuk |
| Journal | The American journal of physiology (Am J Physiol) Vol. 259 Issue 3 Pt 1 Pg. E443-50 (Sep 1990) ISSN: 0002-9513 [Print] United States |
| PMID | 2399977 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't, Research Support, U.S. Gov't, Non-P.H.S., Research Support, U.S. Gov't, P.H.S.) |
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