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| 1 | Dietary advanced glycation end-products aggravate non-alcoholic fatty liver disease显示文摘AIM To determine if manipulation of dietary advanced glycation end product(AGE), intake affects nonalcoholic fatty liver disease(NAFLD) progression and whether these effects are mediated via RAGE. METHODS Male C57Bl6 mice were fed a high fat, high fructose, high cholesterol(HFHC) diet for 33 wk and compared with animals on normal chow. A third group were given a HFHC diet that was high in AGEs. Another group was given a HFHC diet that was marinated in vinegar to prevent the formation of AGEs. In a second experiment, RAGE KO animals were fed a HFHC diet or a high AGE HFHC diet and compared with wildtype controls. Hepatic biochemistry, histology, picrosirius red morphometry and hepatic mR NA were determined. RESULTS Long-term consumption of the HFHC diet generated significant steatohepatitis and fibrosis after 33 wk. In this model, hepatic 4-hydroxynonenal content(a marker of chronic oxidative stress), hepatocyte ballooning, picrosirius red staining, α-smooth muscle actin and collagen type 1A gene expression were all significantly increased. Increasing the AGE content of the HFHC diet by baking further increased these markers of liver damage, but this was abrogated by pre-marination in acetic acid. In response to the HFHC diet, RAGE-/-animals developed NASH of similar severity to RAGE+/+ animals but were protected from the additional harmful effects of the high AGE containing diet. Studies in isolated Kupffer cells showed that AGEs increase cell proliferation and oxidative stress, providing a likely mechanism through which these compounds contribute to liver injury. CONCLUSION In the HFHC model of NAFLD, manipulation of dietary AGEs modulates liver injury, inflammation, and liver fibrosis via a RAGE dependent pathway. This suggests that pharmacological and dietary strategies targeting the AGE/RAGE pathway could slow the progression of NAFLD. | Christopher Leung Chandana B Herath Zhiyuan Jia Sof Andrikopoulos Bronwyn E Brown Michael J Davies Leni R Rivera John B Furness Josephine M Forbes Peter W Angus | 2016 | World Journal of Gastroenterology2016，22，35： | 7 |
| 2 | 地塞米松及N-乙酰半胱氨酸抑制A549细胞IL-8及ICAM-1表达的机制研究显示文摘目的探讨DXM及N-乙酰半胱氨酸(NAC)抑制A549细胞IL-8、ICAM-1表达的机制。方法 ELISA及流式细胞术分别检测IL-8及ICAM-1表达;蛋白印迹法检测GR、HDAC、AP-1、NF-κB表达,分光光度法检测HDAC活性。结果 DXM、NAC均能抑制TNF-α诱导的IL-8、ICAM-1表达增高。DXM能抑制TNF-α、LPS诱导的AP-1及NF-κB转录活化、HDAC表达及活性降低;NAC只抑制NF-κB转录活化,对AP-1转录活化、HDAC表达及活性降低无影响。结论 DXM、NAC均具有抗炎作用。DXM通过增加HDAC蛋白表达及活性,抑制AP-1、NF-κB转录活化发挥抗炎作用,而NAC对HDAC蛋白表达及活性无影响,提示NAC可能不是通过乙酰化信号机制发挥抗炎作用。 | 项琪 付欣 冉丕鑫 张锦 郑西卫 陈娟 郭园园 | 2014 | 中国药理学通报2014，30，9： | 5 |
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