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• W2894592913 abstract "Abstract Background and Aim L‐carnitine (L‐CA) has been used therapeutically to treat hepatic encephalopathy with hyperammonemia, but the mechanism by which L‐CA contributes to ammonia detoxification in the brain is still unclear. Thus, the cytotoxicity and changes in intracellular amino acids (AAs) in astrocytes with hyperammonemia following L‐CA administration were studied. Methods Human astrocytes were treated with ammonium chloride (NH 4 Cl), L‐CA or a mixture of NH 4 Cl, and L‐CA under defined conditions. Total intracellular reactive oxygen species and lactate dehydrogenase leakage were measured following different treatment periods. The intracellular levels of AAs in astrocytes were determined using metabolomic analysis. Results Intracellular total reactive oxygen species and lactate dehydrogenase leakage were significantly increased after treatment with NH 4 Cl. In contrast, co‐treatment with L‐CA significantly inhibited the cytotoxic effects of NH 4 Cl. The intracellular levels of almost all AAs involving glutamine and branched‐chain AAs (BCAAs) were significantly increased in the NH 4 Cl‐treated cells compared with in the control cells; these changes in BCAA levels were reduced with L‐CA co‐treatment. Additionally, the level of 3‐methyl‐2‐oxovaleric acid, which is a metabolite from isoleucine and plays a critical role in neurological damage, was significantly increased in the NH 4 Cl‐treated cells, but this metabolite was significantly decreased with L‐CA co‐treatment. Conclusion L‐CA protects human astrocytes from ammonia‐induced acute cytotoxic effects and the increased intracellular levels of glutamine and BCAAs." @default.
• W2894592913 created "2018-10-12" @default.
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• W2894592913 date "2018-10-19" @default.
• W2894592913 modified "2023-09-27" @default.
• W2894592913 title "L‐carnitine prevents ammonia‐induced cytotoxicity and disturbances in intracellular amino acid levels in human astrocytes" @default.
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• W2894592913 doi "https://doi.org/10.1111/jgh.14497" @default.
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