中文摘要：

目的：观察组织蛋白酶S（Cathepsin S）在不同周龄载脂蛋白E基因缺陷（ApoE-/-）小鼠主动脉的表达，初步探讨Cathepsin S对ApoE-/-小鼠动脉粥样硬化（As）病变的影响。方法：将16只8周龄ApoE-/-小鼠随机分为两组：16周龄组（n=8），24周龄组（n=8），均饲以高脂饮食，分别在16周龄和24周龄处死动物。采用普通光镜、病理图象分析法测定主动脉As斑块面积及管腔面积；免疫组织化学染色方法观察组织蛋白酶S（Cathepsin S）在不同周龄ApoE-/-小鼠主动脉的表达。结果：16周龄组ApoE-/-小鼠主动脉根部出现As病变；与16周龄组ApoE-/-小鼠相比，24周龄组ApoE-/-小鼠主动脉根部As病变显著增强（P〈0.01），免疫组化显示Cathepsin S表达明显增加（P〈0.01）。结论：Cathepsin S在ApoE-/-小鼠主动脉的表达随As病变程度增强而显著增加。

英文摘要：

Objective：To study the expression of Cathepsin S on the atherosclerotic lesion of aortic wall in apoE-deficienct （apoE-/-）mice of different weeks.Methods：Sixteen male apoE-deficienct mice were randomized into two groups：sixteen-week-old group（n-8）,twenty four-week-old group（n=8）.All the mice were fed with high-fat diet and killed at 16 week,24-week respectively. Optical microscopy was adopted to assess the degree of atherosclerotic of aortic wall and image analysis was performed with computer. The expression of Cathepsin S on the atherosclerotic lesion in apoE-deficienct（apoE-/-）mice of different weeks was studied by SABC immunohistochemistry and computerized with imaging analysis respectively.Results：Compared with the sixteen-week-old group,the extent of atherosclerotic lesion of twenty four-week-old group was significantly serious（P〈0.01）;the expression of Cathepsin S in aortic wall was significantly higher（P〈0.01）.Conclusion Expression of Cathepsin S is strengthened obviously along with increase of atherosclerotic lesions in apoE-deficienct mice.