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• W2020362703 abstract "Heat-induced hepatotoxicity accompanying hyperthermic liver perfusion was studied in the isolated, haemoglobin-free perfused rat liver. Trypan blue uptake, a sensitive indicator of cell death, was used to examine the relationship between the efflux of oxidized glutathione (oxidative stress), the appearance of cytosolic enzymes in the perfusate and cell death. Livers were perfused at 37, 42, 42.5 and 43°C. The efflux of total glutathione (GSH) and oxidized glutathione (GSSG) increased with time and temperature. Differences between temperature groups were significant for both parameters for 37 versus 42, 42.5 and 43°C (p < 0.05). Temperature-related differences in GSH levels appeared at 15 min for 37 versus 42 °C and in GSSG levels at 30 min for 37 versus 42 and 42.5°C. Biliary excretion of total GSH increased from 72 nmol at 37°C to 144 nmol at 42°C, 160 nmol at 42.5°C and 124 nmol at 43°C, which was significant for 37 versus 42 and 42.5°C (p < 0.05). The release of allantoin into the perfusate, a measure of purine catabolism and flux through xanthine oxidase, was increased at 42, 42.5 and 43°C compared to 37°C (p < 0.05). Liver injury was assessed by measuring the release of asportate aminotransferase (AST) and lactate dehydrogenase (LDH) and uptake of trypan blue after perfusion at each temperature. There was a pronounced release of LDH and AST into the perfusate after 60 min of perfusion at 42, 42.5 and 43°C, the levels of which were significantly different from the 37°C mean level. There was no uptake of trypan blue after 60 min perfusion at 37°C. Perfusion at 42, 42.5 and 43°C resulted in the uptake of trypan blue in the pericentral areas, but the dye uptake was significant (p < 0.05) compared to 37°C at 42.5 and 43°C only. These data show that heat-induced pericentral cell death is minimal after 60 min at 42–43°C, and that the biochemical processes which occurred during this period suggest ‘oxidative stress’ as a causative factor in hyperthermic hepatotoxicity. In addition, this liver toxicity is probably related to xanthine oxidase activity or the depletion of GSH as the initiating event which leads to lipid peroxidation and cellular damage." @default.
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• W2020362703 date "1991-01-01" @default.
• W2020362703 modified "2023-10-06" @default.
• W2020362703 title "Oxidative stress as a precursor to the irreversible hepatocellular injury caused by hyperthermia" @default.
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• W2020362703 doi "https://doi.org/10.3109/02656739109056444" @default.
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