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中华诊断学电子杂志 ›› 2014, Vol. 02 ›› Issue (02) : 121 -126. doi: 10.3877/cma.j.issn.2095-655X.2014.02.013

所属专题: 文献

基础研究

氯沙坦对兔动脉粥样硬化斑块血管紧张素转换酶2的调节作用及意义
张月辉1, 朱莉2, 张永欢2, 于庆涛2, 周照丽2, 李树英2, 王晓玉2, 张绪洪2, 董波2,()   
  1. 1. 250021 济南,山东大学附属省立医院心内科(现为南方医科大学附属深圳宝安医院重症医学科)
    2. 250021 济南,山东大学附属省立医院心内科
  • 收稿日期:2013-12-16 出版日期:2014-05-26
  • 通信作者: 董波
  • 基金资助:
    国家"973"基础研究资助项目(2013CB530700); 国家自然科学基金资助项目(81170207)

Effect and significance of losartan on the angiotensin converting enzyme 2 in therosclerotic plaques

Yuehui Zhang1, Li Zhu2, Yonghuan Zhang2, Qingtao Yu2, Zhaoli Zhou2, Shuying Li2, Xiaoyu Wang2, Xuhong Zhang2, Bo Dong2,()   

  1. 1. Department of Cardiology, Shandong Provincial Hospital, Shandong University, Jinan 250021, China
  • Received:2013-12-16 Published:2014-05-26
  • Corresponding author: Bo Dong
  • About author:
    Corresponding author: Dong Bo, Email:
引用本文:

张月辉, 朱莉, 张永欢, 于庆涛, 周照丽, 李树英, 王晓玉, 张绪洪, 董波. 氯沙坦对兔动脉粥样硬化斑块血管紧张素转换酶2的调节作用及意义[J]. 中华诊断学电子杂志, 2014, 02(02): 121-126.

Yuehui Zhang, Li Zhu, Yonghuan Zhang, Qingtao Yu, Zhaoli Zhou, Shuying Li, Xiaoyu Wang, Xuhong Zhang, Bo Dong. Effect and significance of losartan on the angiotensin converting enzyme 2 in therosclerotic plaques[J]. Chinese Journal of Diagnostics(Electronic Edition), 2014, 02(02): 121-126.

目的

探讨氯沙坦对兔动脉粥样硬化斑块血管紧张素转换酶2(ACE2)的调节作用。

方法

建立新西兰大白兔动脉粥样硬化模型,随机数字表法分为单纯高脂饲养组、氯沙坦组、氯沙坦+A779组,每组9只,应用油红O染色测斑块脂质含量,免疫组化分别测定斑块巨噬细胞及ACE2、Ang-(1-7)蛋白含量表达,并检测各组ACE2活性。所有结果以均数±标准差表示,实验数据用SPSS 15.0统计软件进行统计分析,各组大白兔动脉粥样硬化组织ACE2活性,多组间的均数比较使用方差分析,组间比较使用t检验。

结果

氯沙坦组[(2.66±0.19)U/(μgprotein·h)]及氯沙坦+A779组[(2.57±0.17)U/(μgprotein·h)]较高脂组[(1.30±0.18)U/(μgprotein·h)]动脉粥样硬化组织ACE2活性明显增加(t=15.87,15.45;P<0.05),氯沙坦组脂质含量[(2.92±2.41)%]及巨噬细胞阳性面积百分率[(15.71±2.46)%]明显少于单纯高脂组[(30.47±1.83)%]、[(23.07±2.06)%]与氯沙坦+A779组[(32.52±2.88)%]、[(22.91±2.11)%],差异有统计学意义(t=7.49,7.68;均P<0.05)、(t=6.88,6.67;均P<0.05)。氯沙坦组动脉粥样硬化斑块内ACE2与Ang-(1-7)蛋白大量表达(0.2330±0.0291与0.2652±0.0234)比单纯高脂组(0.1194±0.0114与0.1580±0.01932)增加,差异有统计学意义(t=10.91,10.58;均P<0.05);氯沙坦+A779组(0.2224±0.0168与0.2583±0.0236)比单纯高脂组增加,差异有统计学意义(t=15.22,9.85;均P<0.05),但与氯沙坦组比较差异无统计学意义(t=0.95,0.63;P>0.05)。

结论

氯沙坦通过上调ACE2,增加ACE2活性,使Ang-(1-7)蛋白表达增多抑制动脉粥样硬化发生发展。

Objective

To investigate the effect of losartan on angiotensin converting enzyme 2 (ACE2)activity and ACE2、Ang-(1-7) protein level in rabbit atherosclerotic plaques and analyse its meaning.

Methods

Male New Zealand White rabbits were constructed atherosclerosis models.The rabbits were randomly 3 groups: high cholesterol group, losartan group and losartan+ A779 group.ACE2 activities were measured by enzymatic assay.The lipid content was evaluated by Oil red O stain, the proteins expression of ACE2、Ang-(1-7) and macrophage infiltration were also detected by immunohistochemistry.The differences of the protein expression of ACE2 were compared with chi-square test and t-test.

Results

The ACE2 activity higher in losartan group [(2.66±0.19)U/(μg protein·h)] and Losartan+ A779 group [(2.57±0.17)U/(μg protein·h)] than those in high-cholesterol group [(1.30±0.18)U/(μg protein·h)], and there was significant difference(t=15.87, 15.45; P<0.05). The lipid content and macrophage infiltration in losartian group[(22.92±2.4)% and (15.71±2.46)% respectly] were significantly lower than those of in high-cholesterol group[(30.47±1.83)% and (23.07±2.06)%] and in Losartan+ A779 group[(32.52±2.88)% and (22.91±2.11%)]. The expression of ACE2 and Angiotensin-(1-7) in losartan group[(0.2330±0.0291), (0.2652±0.0234)] and in losartan + A779 group[(0.2224±0.0168, 0.2583±0.0236)] were significant higher than that in high-cholesterol group[(0.1194±0.0114, 0.1580±0.01932)]. However, there was no difference between losartan group and losartan+ A779 group (P>0.05).

Conclusion

The results show that ACE2 activity and ACE2、Ang-(1-7) protein are regulated in atherosclerotic plaque by losartan, which may play an important role in the treatment of AS, proterin and ACE2, Ang-(1-7) protein.

图1 各组大白兔胸主动脉斑块内脂质检测组织病理学图片(油红O染色×100)
图2 各组胸主动脉巨噬细胞源性泡沫细胞检测组织病理学图片(免疫组化染色×200)
图3 各组胸主动脉血管紧张素转换酶2检测组织病理学图片(免疫组化染色×400)
图4 各组胸主动脉Ang-(1-7)检测组织病理学图片(免疫组化染色×400)
表1 各组大白兔不同时间实验血浆总胆固醇水平的比较(mmol/L ,±s)
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