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Medicine
颈动脉支架植入再狭窄的研究的小鼠模型
颈动脉支架植入再狭窄的研究的小鼠模型
JoVE Journal
Medicine
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JoVE Journal Medicine
A Murine Model of Stent Implantation in the Carotid Artery for the Study of Restenosis

颈动脉支架植入再狭窄的研究的小鼠模型

Full Text
26,465 Views
04:30 min
May 14, 2013

DOI: 10.3791/50233-v

Sakine Simsekyilmaz1, Fabian Schreiber2, Stefan Weinandy3, Felix Gremse4, Tolga Taha Sönmez5, Elisa A. Liehn1

1Institute for Molecular Cardiovascular Research,RWTH Aachen University, 2Institute for Textile Technology and Mechanical Engineering,RWTH Aachen University, 3Institute for Applied Medical Engineering,Helmholtz-Institute of RWTH Aachen University, 4Department of Experimental Molecular Imaging,RWTH Aachen University, 5Department of Oral and Maxillofacila Surgery,RWTH Aachen University

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Please note that some of the translations on this page are AI generated. Click here for the English version.

Overview

This article describes a model for stent implantation in the mouse carotid artery, which is rapid and accessible for studying vascular wall reactions to drug-eluting stents and restenosis mechanisms.

Key Study Components

Area of Science

  • Neuroscience
  • Vascular Biology
  • Cardiovascular Research

Background

  • Stent implantation models are crucial for studying vascular responses.
  • Existing models often require advanced surgical skills and have high complication rates.
  • This model aims to minimize complications while allowing for effective study.
  • The procedure is demonstrated by Dr. Simsek Imas from the laboratory.

Purpose of Study

  • To develop a simple and rapid stent implantation technique in mice.
  • To investigate the effects of different drug coatings on vessel remodeling.
  • To analyze plaque formation and restenosis mechanisms post-implantation.

Methods Used

  • Preparation of the stent using a silicone tube for implantation.
  • Isolation of the common carotid artery and suturing to control blood flow.
  • Insertion of the stent through a small incision in the external carotid artery.
  • Histological analysis of plaque formation using Giemsa staining.

Main Results

  • Micro-computed tomography confirmed stent stability post-implantation.
  • No significant vessel or endothelial damage was observed.
  • Histological staining revealed the extent of plaque formation.
  • Reendothelialization of stent struts was documented.

Conclusions

  • The described model is effective for studying stent implantation and restenosis.
  • It minimizes complications associated with traditional methods.
  • This approach can facilitate further research into vascular responses and treatments.

Frequently Asked Questions

What is the main goal of the stent implantation model?
The main goal is to study vessel remodeling and the effects of drug coatings on stents.
Who demonstrated the stent implantation procedure?
Dr. Simsek Imas from the laboratory demonstrated the procedure.
What methods are used to analyze plaque formation?
Plaque formation is analyzed using Giemsa staining and histological techniques.
How does this model reduce complications?
The model keeps the stent in view throughout the implantation, minimizing risks.
What were the main findings regarding vessel damage?
No significant vessel or endothelial damage was found in the study.
What is the significance of reendothelialization in this study?
Reendothelialization is crucial for understanding the healing process post-stent implantation.

模型小鼠颈动脉支架植入术。相比其他类似的方法,这个过程是非常快速,简单,方便,在一个方便的方法来研究血管壁的反应,不同的药物洗脱支架再狭窄的分子机制提供了可能性。

该程序的总体目标是将支架植入小鼠颈动脉,以便研究血管重塑或不同药物涂层的效果。首先,通过将支架转移到硅胶管中来准备植入。接下来,分离总动脉并缝合到位以中断血液流动。

然后通过颈外动脉上的一个小切口引入支架。就位后,硅胶管和导丝被移除,支架留在颈总动脉中。最后,样品用 gemsa 染色以分析牙菌斑的形成。

现有的模型用于 misa 中的即刻再狭窄,它们需要精确的手术技巧和常见的并发症和分裂或瘫痪。风险是复杂性是通过在整个植入过程中保持支架在视野中来最小化我们的模型。该程序的一部分将由我们实验室父亲的 Simsek Imas 博士后提供。

我将演示支架植入柱动脉的过程。首先使用镊子将支架转移到 2 厘米长的硅胶管上。在距前端短 2 毫米处停止,应将管子的暴露端对角线切开,以便于植入,植入前湿润支架,使插入更容易。

接下来,确认成年雄性小鼠的适当麻醉深度。在眼睛上涂抹保护性软膏后,剃掉颈部腹侧区域。接下来,在立体显微镜下用 Betadine 和酒精的反复摩擦清洁该部位。

用剪刀在该区域做一个小的正中切口。通过脂肪和组织分离,直到分离出左侧颈总动脉。一旦看到,在距离分叉处约 1 厘米的总动脉周围系上缝合线。

在颈外动脉周围系上两根缝合线,在支架植入术中使远端结松散老化。接下来,在颈内动脉周围系上缝合线。固定缝合线后,在靠近近端结的外动脉上做一个小切口。

使用导丝,引入包含支架的硅胶管。就位后,取出硅胶管,让支架膨胀。接下来,收紧颈外动脉上的远端结,并移除颈内动脉和颈总动脉上的缝合线以恢复血液流动。

用缝合夹闭合切口,并将动物放在加热灯下。直到完全康复。在支架植入后的不同时间点检查词斑的形成。

首先,在安乐死和经心灌注后,分离左颈动脉并去除包含支架的部分。将样品放入 4% PFA 溶液中。至少 16 小时后,将样品嵌入塑料中,如图所示。

用金刚石带锯切割 50 微米厚的切片后,进行宝石维持,以评估斑块的形成。支架植入后 1 周进行的显微计算机断层扫描成像显示支架未因血流脱位。如奥丁蓝所示,在血管的未凸起区域未发现血管或内皮损伤,内皮特异性 CD 31 染色组织学染色用于研究斑块形成的程度。

在这里,支架作为新内膜内的黑色染色纤维蛋白可见。在某些情况下,观察到血管完全闭塞。支架支柱的再内皮化在左侧用双箭头表示,而不完全的管腔再内皮化在右侧用单箭头表示。

在尝试此程序时,重要的是要记住,手术区域应经常浇水,以防止干燥并使支架的作更容易。

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