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Effects of rosiglitazone on the liver histology and mitochondrial function in ob/ob mice
Author(s) -
GarcíaRuiz Inmaculada,
RodríguezJuan Cristina,
DíazSanjuán Teresa,
Martínez Miguel Ángel,
MuñozYagüe Teresa,
SolísHerruzo José A.
Publication year - 2007
Publication title -
hepatology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.488
H-Index - 361
eISSN - 1527-3350
pISSN - 0270-9139
DOI - 10.1002/hep.21687
Subject(s) - rosiglitazone , endocrinology , steatosis , medicine , insulin resistance , mitochondrion , chemistry , fatty liver , steatohepatitis , leptin , insulin , biology , biochemistry , disease , obesity
Insulin resistance is present in almost all patients with nonalcoholic steatohepatitis (NAFLD), and mitochondrial dysfunction likely plays a critical role in the progression of fatty liver into nonalcoholic steatohepatitis. Rosiglitazone, a selective ligand of peroxisome proliferator‐activated receptor gamma (PPARγ), is an insulin sensitizer drug that has been used in a number of insulin‐resistant conditions, including NAFLD. The aim of this study was to analyze the effects of rosiglitazone on the liver histology and mitochondrial function in a model of NAFLD. All studies were carried out in wild‐type and leptin‐deficient (ob/ob) C57BL/6J mice. Ob/ob mice were treated with 1 mg/kg/day, and activity of mitochondrial respiratory chain (MRC), beta‐oxidation, lipid peroxidation, glutathione content in mitochondria, and 3‐tyrosine–nitrated proteins in mitochondria were measured. In addition, histological and ultrastructural changes induced by rosiglitazone were also noted. Rosiglitazone treatment increased liver steatosis, particularly microvesicular steatosis. In these animals, mitochondria were markedly swollen with cristae peripherally placed. In ob/ob mice, this drug increased PPARγ protein expression and lipid peroxide content in liver tissue and decreased glutathione concentration in mitochondria. Rosiglitazone suppressed the activity of complex I of the MRC in ob/ob mice, but did not affect beta‐oxidation. 3‐Tyrosine nitrated mitochondrial proteins, significantly increased in ob/ob mice, were not modified by rosiglitazone treatment. Conclusion: Treatment of ob/ob mice with rosiglitazone did not reverse histological lesions of NAFLD or improve MRC activity. On the contrary, rosiglitazone reduced activity of complex I and increased oxidative stress and liver steatosis. (H EPATOLOGY 2007.)