Abstract
The temporal relationship of hepatic steatosis and changes in liver oxidative stress and fatty acid (FA) composition to the development of non-alcoholic steatohepatitis (NASH) remain to be clearly defined. Recently, we developed an experimental model of hepatic steatosis and NASH, the transgenic spontaneously hypertensive rat (SHR) that overexpresses a dominant positive form of the human SREBP-1a isoform in the liver. These rats are genetically predisposed to hepatic steatosis at a young age that ultimately progresses to NASH in older animals. Young transgenic SHR versus SHR controls exhibited simple hepatic steatosis which was associated with significantly increased hepatic levels of oxidative stress markers, conjugated dienes, and TBARS, with decreased levels of antioxidative enzymes and glutathione and lower concentrations of plasma α- and γ-tocopherol. Transgenic rats exhibited increased plasma levels of saturated FA, decreased levels of n−3 and n−6 polyunsaturated FA (PUFA), and increased n−6/n−3 PUFA ratios. These results are consistent with the hypothesis that excess fat accumulation in the liver in association with increased oxidative stress and disturbances in the metabolism of saturated and unsaturated fatty acids may precede and contribute to the primary pathogenesis of NASH.
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Acknowledgments
This work was supported by National Institutes of Health grants HL35018, HL56028, and HL63709 (T.W.K) and by grant IAA500110604 from the Czech Academy of Sciences, grants NR9387 and NR9359 from the Ministry of Health of the Czech Republic and the European Commission within the Sixth Framework Programme through the Integrated Project EURATools (contract no. LSHG-CT-2005-019015) (M.P.). M.P. is an international research scholar of the Howard Hughes Medical Institute.
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Malínská, H., Oliyarnyk, O., Hubová, M. et al. Increased liver oxidative stress and altered PUFA metabolism precede development of non-alcoholic steatohepatitis in SREBP-1a transgenic spontaneously hypertensive rats with genetic predisposition to hepatic steatosis. Mol Cell Biochem 335, 119–125 (2010). https://doi.org/10.1007/s11010-009-0248-5
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DOI: https://doi.org/10.1007/s11010-009-0248-5