Establishment of a rat model of infrarenal abdominal aortic aneurysm <italic style="font-style: italic">via</italic> retroperitoneal approach

Junxing ZHU; Quanqiao TANG; Song FENG; Xingchi SHI; Siyi YI; Can ZHOU; Ying YANG

doi:10.16016/j.1000-5404.202102082

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Establishment of a rat model of infrarenal abdominal aortic aneurysm via retroperitoneal approach

Basic Medicine | 更新时间：2026-01-09

- Establishment of a rat model of infrarenal abdominal aortic aneurysm via retroperitoneal approach
- Journal of Third Military Medical University Vol. 43, Issue 16, Pages: 1559-1565(2021)
- 作者机构：
  
  1.637000 四川南充，川北医学院: 临床医学系
  2.637000 四川南充，川北医学院: 附属医院心血管疾病研究室
  3.637000 四川南充，川北医学院: 基础医学院组织胚胎教研室
- 作者简介：
- 基金信息：
  
  the Project of Science and Technology Plan of Sichuan Province(2016JY0172);the Scientific Research Project of Sichuan Provincial Health and Family Planning Commission(16PJ121)
- DOI：10.16016/j.1000-5404.202102082
  CLC： R-332;R543.16;R615
- Received：18 February 2021，
  
  Revised：2021-04-28，
  
  Published：30 August 2021
- 稿件说明：
移动端阅览
Junxing ZHU, Quanqiao TANG, Song FENG, et al. Establishment of a rat model of infrarenal abdominal aortic aneurysm via retroperitoneal approach[J]. Journal of Third Military Medical University, 2021, 43(16): 1559-1565.
DOI：

Junxing ZHU, Quanqiao TANG, Song FENG, et al. Establishment of a rat model of infrarenal abdominal aortic aneurysm via retroperitoneal approach[J]. Journal of Third Military Medical University, 2021, 43(16): 1559-1565. DOI： 10.16016/j.1000-5404.202102082.

摘要

目的

经腹膜后入路构建简便稳定的大鼠肾下腹主动脉瘤模型。

方法

健康成年SD大鼠20只，按雌雄比例1∶1，随机分为模型组和对照组，每组10只。两组均采用经腹膜后入路游离肾下腹主动脉段，模型组以腔内灌注弹性蛋白酶0.1 mL(约含5 U)20 min，腔外氯化钙(1.0 mol/L)浸润10 min处理。对照组以生理盐水替代弹性蛋白酶和氯化钙。建模术后饲养4周开腹收集腹主动脉标本，采用游标卡尺测量术中、术后腹主动脉直径，以术后4周腹主动脉直径扩张50%以上或动脉瘤破裂作为诊断腹主动脉瘤标准。采用HE、EVG、Masson染色和免疫组织化学(immunohistochemical，IHC)观察两组大鼠腹主动脉病理组织学变化。

结果

两组大鼠手术成功率均为100%，对照组存活率100%，无1例成瘤；模型组大鼠存活率80%，成瘤率80%。两组成瘤率差异有统计学意义(

＜0.05)。术前两组腹主动脉直径差异无统计学意义(

0.05)。术后4周模型组腹主动脉直径明显大于对照组，扩张率明显高于对照组，差异均有统计学意义(

＜0.05)。模型组腹主动脉呈梭形或囊状扩张，灌注段腹主动脉周围黏连明显，局部可见钙化灶。HE染色显示，模型组血管壁厚度明显小于对照组(

＜0.05)。EVG染色显示，模型组血管弹性纤维含量明显低于对照组(

＜0.05)。Masson染色显示，模型组血管胶原纤维含量明显低于对照组(

＜0.05)。平滑肌细胞IHC染色显示，模型组平滑肌细胞含量明显低于对照组(

＜0.05)。

结论

经腹膜后入路联合腔内弹性蛋白酶灌注和腔外氯化钙浸润法可简单有效地构建稳定、可重复性、拟人性强的大鼠肾下腹主动脉瘤模型。

Abstract

Objective

To establish a simple and stable model of infrarenal abdominal aortic aneurysm in rats by retroperitoneal approach.

Methods

Twenty healthy adult SD rats were randomly divided into model and control group depending on a ratio of male to female at 1∶1

with 10 rats in each group. The infrarenal abdominal aorta was freed

via

the retroperitoneal approach in both groups. Then

in the model group

0.1 mL elastase (about 5 U) was infused into the cavity for 20 min and 1.0 mol/L

calcium chloride was infiltrated outside the cavity for 10 min. However

normal saline was used instead of elastase and calcium chloride in the control group. Abdominal aortic specimens were collected by laparotomy in 4 weeks after surgery. The diameter of the abdominal aorta was measured with vernier caliper during and after operation. The abdominal aortic diameter dilated by more than 50% or the aneurysm ruptured 4 weeks after operation is the diagnostic standard for abdominal aortic aneurysm. HE

EVG

Masson and immunohistochemical (IHC) staining were performed to observe the pathohistological changes of abdominal aorta in both groups.

Results

The surgical success rate was 100%

survival rate was 100%

and tumor formation rate was 0% in the rats of the control group

while the rates were 100%

80%

and 80% respectively in the model group. Significant difference was seen in the rate of tumor formation between the 2 groups (

0.05). There was no statistical difference in the diameter of abdominal aorta between the 2 groups before operation (

0.05)

and in 4 weeks after operation

the diameter was obviously larger and the expansion rate was higher in the model group than in the control group (

0.05). In the model group

the abdominal aorta was spindle-shaped or cystic dilatation

obvious adhesion was observed around the abdominal aorta in the perfusion segment

and local calcification was seen. HE staining showed that the thickness of the vessel wall was significantly thinner in the model group than in the control group (

0.05). EVG staining displayed that the content of vascular elastic fibers was significantly lower in the model group than the control group (

0.05). Masson staining indicated that the content of vascular collagen fibers was significantly lower in the model group than the control group (

0.05). IHC staining for smooth muscle cells sh

owed that the content of smooth muscle cells was significantly lower in the model group than the control group (

0.05).

Conclusion

Retroperitoneal approach in combination of intracavitary elastase perfusion and extracavitary calcium chloride infiltration can simply and effectively construct a stable

reproducible and humanoid rat of model infrarenal abdominal aortic aneurysm.

关键词

Keywords

references

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⁰

Establishment of a rat model of infrarenal abdominal aortic aneurysm via retroperitoneal approach

DOI：10.16016/j.1000-5404.202102082

摘要

Abstract

关键词

Keywords

references