Brain creatine kinase activity is inhibited after hepatic failure induced by carbon tetrachloride or acetaminophen


Encephalopathy is an important cause of morbidity and mortality in patients with severe hepatic failure and the mechanisms underlying hepatic encephalopathy are still not fully known. Considering that creatine kinase (CK) play a crucial role in brain energy homeostasis and is inhibited by free radicals, and that oxidative stress is probably involved in the pathogenesis of hepatic encephalopathy, we evaluated CK activity in hippocampus, striatum, cerebellum, cerebral cortex and prefrontal cortex of rats submitted to acute administration of carbon tetrachloride or acetaminophen. The effects of the administration of antioxidants, N-acetylcysteine (NAC) plus deferoxamine (DFX) in association, and taurine, were also evaluated. Our findings demonstrated that carbon tetrachloride inhibited CK activity in cerebellum; acetaminophen inhibited the enzyme in cerebellum and hippocampus. CK activity was not affected in other brain areas. The administration of NAC plus DFX reversed the inhibition of CK activity caused by carbon tetrachloride in cerebellum and by acetaminophen in cerebellum and hippocampus. On the other hand, taurine was not able to reverse the inhibition in CK activity. Although it is difficult to extrapolate our findings to the human condition, the inhibition of brain CK activity after hepatic failure may be involved in the pathogenesis of hepatic encephalopathy.

DOI: 10.1007/s11011-009-9143-8

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@article{Pacheco2009BrainCK, title={Brain creatine kinase activity is inhibited after hepatic failure induced by carbon tetrachloride or acetaminophen}, author={Gustavo S. Pacheco and Jordana P. Panatto and Diego Antonio Fagundes and Giselli Scaini and Cintia Bassani and I C Jeremias and Gislaine Tezza Rezin and Larissa de Souza Constantino and Felipe Dal-Pizzol and Emilio Luiz Streck}, journal={Metabolic Brain Disease}, year={2009}, volume={24}, pages={383-394} }