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山东大学学报(医学版)

• 基础医学 •    下一篇

阿托伐他汀对动脉粥样硬化模型兔toll样受体4及其下游信号表达的影响

李悦妍1,关玉庆2,苗伟2,户克庆2,胡鸿雁3,李莹2,王晓琦2,苏国海2   

  1. 1.山东大学医学院, 山东 济南 250012; 2.山东大学附属济南市中心医院心内科, 山东 济南 250013;
    3.山东大学附属济南市中心医院介入科, 山东 济南 250013
  • 收稿日期:2013-12-11 出版日期:2014-06-10 发布日期:2014-06-10
  • 通讯作者: 苏国海。 E-mail:guohaisu@medmail.com.cn
  • 基金资助:
    济南市企业自主创新计划(201003112)

Effect of atorvastatin on TLR4 expression and downstream signaling in atherosclerotic rabbits

LI Yueyan1, GUAN Yuqing2, MIAO Wei2, HU Keqing2, HU Hongyan3, LI Ying2, WANG Xiaoqi2, SU Guohai2   

  1. 1. School of Medicine, Shandong University, Jinan 250012, Shandong, China;
    2. Department of Cardiology, Jinan Central Hospital of Shandong University, Jinan 250013, Shandong, China;
    3. Department of Intervention, Jinan Central Hospital of Shandong University, Jinan 250013, Shandong, China
  • Received:2013-12-11 Online:2014-06-10 Published:2014-06-10

摘要: 目的  探讨短期内不同剂量阿托伐他汀对动脉粥样硬化家兔模型toll样受体4(TLR4)的表达及其下游信号单核细胞趋化蛋白(MCP-1)、转化生长因子β(TGF-β)血清水平的影响。方法  28只新西兰大白兔随机分为对照组(n=6)、模型组(n=6)、阿托伐他汀低剂量组(n=8)和阿托伐他汀高剂量组(n=8)。除对照组外其他各组均通过8周高脂喂养联合腹主动脉球囊损伤术建立动脉粥样硬化模型。8周后,模型组继续高脂喂养,阿托伐他汀低、高剂量两组在高脂喂养的同时分别给予不同剂量药物干预2周。10周处死所有动物。静脉血测定血清血脂水平及ELISA法测定炎性因子MCP-1、TGF-β的血清水平。HE、Masson染色和天狼猩红染色观察血管病理变化及胶原纤维含量,免疫组化检测TLR4的表达水平。结果  对照组血脂水平和炎性因子MCP-1水平明显低于其他各组(P<0.05),TGF-β水平明显高于其他各组(P<0.05)。阿托伐他汀低、高剂量两组血脂及MCP-1水平明显低于模型组(P<0.05),TGF-β水平明显高于模型组(P<0.05),且高剂量组变化更加明显(P<0.01)。对照组TLR4的表达明显低于其他各组(P<0.05),阿托伐他汀低、高剂量组显著低于模型组(P<0.05),且高剂量他汀组比低剂量组降低更为显著(P<0.01)。结论  阿托伐他汀可在短期内降低血脂,同时通过减少TLR4的表达及调节下游信号MCP-1、TGF-β的释放发挥抗动脉粥样硬化作用,且具有剂量依赖性。

关键词: 阿托伐他汀;动脉粥样硬化;Toll样受体4;单核细胞趋化蛋白;转化生长因子&beta

Abstract: Objective  To explore the short-term effect of different doses of atorvastain on toll-like receptor 4 (TLR4) protein and TLR4-dependent downstream signaling monocyte chemoattractant protein-1 (MCP-1) and transforming growth factor-β (TGF-β) in an atherosclerotic rabbit model. Methods  A total of 28 New Zealand white rabbits were randomized into the normal group (n=6), model group (n=6), atorvastain low-dose group (n=8) and atorvastain high-dose group (n=8). Except for the normal group, the other groups were fed with 8-week high-fat diet combined with aortaventralis balloon-dilation injury to establish atherosclerotic model. After 8 weeks, the model group continued to eat high fat diet, while the two atorvastain groups received 2-week extra treatment with different doses of drug respectively. At the 10th week, all rabbits were sacrificed. Venous blood was drawn to measure serum lipid and ELISA was used to quantify the amount of inflammation mediators MCP-1 and TGF-β. HE, Masson and Sirius red staining were used to evaluate the amount of collagenous fiber and the pathophysiological changes of abdominal aorta. TLR4 was observed by immunohistochemical method. Results  At the end of the study, serum lipid and inflammation mediators MCP-1 and TGF-β in the normal group were significantly lower than those in the other three groups (P<0.05), and significantly lower in the two atorvastain groups than in the model group, while the decrease in the atorvastain high-dose group was much more obvious (P<0.01). The expression of TLR4 in the normal group was lower than those in the other three groups, which was significantly inhibited by high-dose atorvastain. Conclusion  Atorvastatin is able to lower serum lipid in a dose-dependent manner in short term, and decrease atherosclerosis by inhibiting TLR4 expression and regulating the downstream MCP-1 and TGF-β signaling pathways.

Key words: Toll-like receptor 4, Transforming growth factor-β, Atorvastatin, Monocyte chemoattractant protein-1, Atherosclerosis

中图分类号: 

  • R541.4
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