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Detoxification of ammonia by the urea cycle and maintenance of glucose homeostasis by gluconeogenesis are two critical functions of the liver. The bile duct ligation (BDL) model of cirrhosis was used to test the ability of hyperpolarized [6-13C]arginine and [1-13C]pyruvate to detect changes in liver function. The conversion of hyperpolarized L-[6-13C]arginine to 13C-urea was observed in a sham-operated rat but not in BDL rats. Striking differences in pyruvate metabolism between the two groups were also noted, indicating that these probes can sense changes in hepatic mitochondrial and cytoplasmic metabolism associated with biliary cirrhosis.
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