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- W4293731114 abstract "SUMMARY Cysteine plays critical roles in cellular biosynthesis, enzyme catalysis, and is an essential contributor to redox metabolism. While cultured cells are highly dependent on exogenous cystine for proliferation and survival, how diverse tissues obtain and use cysteine in vivo has not been characterized. We comprehensively interrogated cysteine metabolism in normal murine tissues and the cancer that arise from them using stable isotope 13 C-serine and 13 C-cystine tracing. We found that de novo cysteine synthesis was highest in normal liver and pancreas and absent in lung tissue. In tumors, cysteine synthesis was either inactive or downregulated during tumorigenesis. By contrast, cystine uptake and metabolism to downstream metabolites was a universal feature of normal tissues and tumors. Differences in cysteine catabolism were evident across tumor types, including glutathione synthesis. Thus, cystine is a major contributor to the cysteine pool in tumors and cysteine catabolic pathways are differentially active across tumor types." @default.
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- W4293731114 date "2022-08-26" @default.
- W4293731114 modified "2023-10-16" @default.
- W4293731114 title "The Origin of Cysteine and its Catabolism in Mammalian Tissues and Tumors" @default.
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- W4293731114 doi "https://doi.org/10.1101/2022.08.26.505162" @default.
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