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1: Hepatology. 2007 Feb;45(2):391-403.
This study tested whether hepatic steatosis sensitizes liver to toxicant-induced injury and investigated the potential mechanisms of hepatotoxic sensitivity. The hypothesis that fatty hepatocytes undergo cell cycle arrest due to (1) an inability to replenish ATP due to overexpressed uncoupling protein-2 (UCP-2) or (2) induction of growth inhibitor p21 leading to G1/S phase arrest was tested. Steatotic livers showed 10-fold lower ATP levels due to upregulated UCP-2 throughout the time course after CCl4 administration, leading to sustained inhibition of cell division. hus, fatty hepatocytes fail to undergo compensatory cell division, rendering the liver susceptible to progression of liver injury. Conclusion: Impaired tissue repair sensitizes the steatotic livers to hepatotoxicity. T |
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