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Effect of rosiglitazone on insulin resistance and adiponectin in non-alcoholic fatty liver disease induced by high-fat diet in rats
Min Zhi, Min-Hu Chen, Jie Chen, Wen-Ji Chen, Jiang-Ming Lang
Min Zhi, Department of Gastroenterology, the First Affiliated Hospital of Sun Yat-Sen University, Guangzhou 510080, Guangdong Province, China; Diabetes Center, Foshan Hospital of Traditional Chinese Medicine Affiliated to Guangzhou University of Traditional Chinese Medicine, Foshan 528000, Guangdong Province, China
Min-Hu Chen, Jie Chen, Wen-Ji Chen, Department of Gastroenterology, the First Affiliated Hospital of Sun Yat-Sen University, Guangzhou 510080, Guangdong Province, China
Jiang-Ming Lang, Diabetes Center, Foshan Hospital of Traditional Chinese Medicine Affiliated to Guangzhou University of Traditional Chinese Medicine, Foshan 528000, Guangdong Province, China
Supported by: National Natural Science Foundation of China, No. 30600845; Science Foundation of the Health Department of Guangdong Province, No. B2006135; Science Research and Innovative Foundation of Guangzhou University of Traditional Chinese Medicine, 2005.
Correspondence to: Min Zhi, Department of Gastroenterology, Foshan Hospital of Traditional Chinese Medicine Affiliated to Guangzhou University of Traditional Chinese Medicine, 6 Qinren Road, Foshan 528000, Guangdong Province, China. merryzhi@163.com
Received: May 11, 2007 Revised: September 18, 2007 Accepted: September 28, 2007 Published online: September 28, 2007
AIM: To investigate the effect of rosiglitazone on insulin resistance and adiponectin in non-alcoholic fatty liver disease induced by high-fat diet in rats.
METHODS: Thirty Wistar rats were randomly divided into three groups of 10 rats each: model group (high-fat diet + intragastric distilled water); control group (normal diet + intragastric distilled water); and rosiglitazone group [high-fat diet + intragastric rosiglitazone, 3 mg/(kg•d)]. The levels of triglyceride (TG), total cholesterol (TC), aspartate transaminase (AST) and alanine transaminase (ALT), and homeostasis model assessment of insulin resistance (HOMA-IR) were investigated. Histological liver sections were observed by HE and Sudan Ⅲ staining. Adiponectin mRNA in the liver was detected by real-time fluorescent quantitative RT-PCR. Adiponectin protein in the liver was detected by Western blotting.
RESULTS: There were significant differences in TG (1.51 ± 0.37 mmol/L vs 0.98 ± 0.51 mmol/L, P < 0.01), TC (2.74 ± 0.65 mmol/L vs 1.71 ± 0.37 mmol/L, P < 0.05), ALT (450.20 ± 244.12 U/L vs 264.56 ± 48.44 U/L, P < 0.01), AST (460.30 ± 310.13 U/L vs 196.11 ± 52.23 U/L, P < 0.01) and HOMA-IR (3.46 ± 1.16 vs 1.07 ± 0.26, P < 0.01) between the model and control groups. Rosiglitazone obviously decreased the level of TG (1.27 ± 0.50 mmol/L), ALT (360.26 ± 244.37 U/L), AST (300.20 ± 233.13 U/L) and HOMR-IR (1.44 ± 0.37) (all P < 0.05). The effects were confirmed by histopathology. The mRNA (552.40 ± 268.13 vs 215.95 ± 135.87, P < 0.05) and protein content of adiponectin in the rosiglitazone group was higher than that in the model group.
CONCLUSION: High-fat diet may induce non-alcoholic fatty liver disease and insulin resistance, and may lead to abnormal increases in aminopherase and blood fat level. Rosiglitazone can improve the fatty liver and insulin resistance induced by high-fat diet. The mechanism may be related to adiponectin.
Citation: Zhi M, Chen MH, Chen J, Chen WJ, Lang JM. Effect of rosiglitazone on insulin resistance and adiponectin in non-alcoholic fatty liver disease induced by high-fat diet in rats. Shijie Huaren Xiaohua Zazhi 2007; 15(27): 2869-2874
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