Effects of rosiglitazone on the expression of TNF-? in visceral adipose tissue of insulin-resistant rats
- VernacularTitle:罗格列酮对胰岛素抵抗大鼠内脏脂肪组织TNF-?表达的影响
- Author:
Ying LIU
;
Zhimin LIU
;
Jin HE
;
Ying ZHAO
;
Mike MIN
- Publication Type:Journal Article
- Keywords:
insulin resistance;
rosiglitazone;
adipose tissue;
tumor necrosis factor-alpha
- From:
Medical Journal of Chinese People's Liberation Army
1981;0(06):-
- CountryChina
- Language:Chinese
-
Abstract:
Objective To explore the effects of rosiglitazone on the expression of TNF-? in visceral adipose tissue of insulin-resistant rats induced by high-glucose diet. Methods Sprague-Dawley (SD) rats were fed with high-glucose diet for 6 months to reproduce the non-obesity insulin-resistant rat model (abbreviated as IR rats). The model rats were then randomized into insulin resistan (IR) group and rosiglitazone (ROS) group (10 each). Ten rats fed with normal diet were enrolled as controls (CN group). Rats in ROS group were administered with 10?mol/(kg?d) of rosiglitazone for 6 weeks from the 7th week of experiment,and those in CN and IR groups were administered with same amount of distilled water. At the 6th and 12th week,the systolic pressure,body weight,and biochemical parameters (fasting and 2-hour post-glucose load plasma glucose,insulin,free fatty acid,triglyceride,high density lipoprotein cholesterol) were measured,and insulin resistance index (HOMA-IR) was calculated. At the end of the 12th week,the visceral adipose tissue was collected to calculate the ratio of visceral fat to body weight (VF/BW),and to determine the protein and mRNA expressions of tumor necrosis factor-? (TNF-?) with inmmunohistochemical assay and RT-PCR. Results As compared with CN group,the systolic pressure,HOMA-IR,plasma insulin,triglyceride and free fatty acid increased,whereas high density lipoprotein cholesterol decreased (P0.05). Inmmunohistochemical examination showed positive expression of TNF-? in intercellular substance,but not in visceral adipocytes. The expressions of TNF-? protein and mRNA in visceral adipose tissue were dramatically higher in IR group than in CN and ROS groups (P0.05). Conclusion Rosiglitazone may significantly abate insulin resistance,reduce the abnormality of plasma lipid and blood pressure,and inhibit the over expression of TNF-? in visceral adipose tissue in the non-obesity insulin-resistant rats induced by high-glucose diet.
