首都医科大学学报 ›› 2007, Vol. 28 ›› Issue (6): 727-731.

• 专题报道 • 上一篇    下一篇

超顺磁性氧化铁MR成像检测兔动脉粥样硬化斑块的实验研究

马占龙1, 滕皋军2, 麦筱莉1, 孙军辉1, 张洪英1, 余辉1, 李国昭1   

  1. 1. 江苏省分子影像与功能影像重点实验室;2. 东南大学附属中大医院放射科
  • 收稿日期:2007-10-16 修回日期:1900-01-01 出版日期:2007-12-24 发布日期:2007-12-24
  • 通讯作者: 滕皋军

Magnetic Resonance Imaging of Atherosclerotic Plaques with Superparamagnetic Iron Oxide Particles in Rabbit Model

Ma Zhanlong1, Teng Gaojun2, Mai Xiaoli1, Sun Junhui1, Zhang Hongying1, Yu Hui1, Li Guozhao1   

  1. 1. Key Laboratory of Molecular Imaging and Function Imaging of Jiangsu Province;2. Department of Radiology, Zhongda Hospital, Southeast University
  • Received:2007-10-16 Revised:1900-01-01 Online:2007-12-24 Published:2007-12-24

摘要:

目的 探讨超顺磁性氧化铁(SPIO)作为磁共振成像(MRI)示踪剂使动脉粥样斑块成像的可行性。方法 采用高脂饲养结合球囊损伤颈动脉血管内皮的方法,建立兔颈动脉粥样硬化模型。10只动脉粥样硬化模型兔分为2组,实验组(A)5只,经外周静脉注射SPIO(1 mmol/kg);对照组(B)5只,经外周静脉注射等量生理盐水。分别于24 h、48 h及72 h后行MRI扫描检查,然后行损伤颈动脉的病理组织学检查。结果 在外周静脉注射超顺磁性氧化铁24 h后,A组中3只兔的T2*WI显示损伤的血管壁呈明显低信号区,血管腔明显呈"管腔扩大样"改变;B组则无明显异常信号改变;病理学检测显示A组5只MR信号改变实验兔的损伤血管内膜及斑块组织中有Perl's蓝染色阳性颗粒;B组粥样斑块组织中则无该染色阳性颗粒,2组间Perl's蓝染色阳性颗粒差异有统计学意义(P<0.05)。结论 超顺磁性氧化铁可以靶向动脉粥样硬化斑块中的巨噬细胞,可作为MRI示踪剂使活体兔的动脉粥样硬化斑块成像,为动脉粥样硬化斑块的临床分子成像提供了实验依据。

关键词: 动脉粥样硬化, 磁共振成像, 超顺磁性氧化铁, 动物实验

Abstract:

Objective To investigate the possibility of superparamagnetic iron-oxide(SPIO) particles as a marker of atherosclerotic plaques detected with 1.5T magnetic resonance imaging system in New Zealand white rabbit model.Methods Model of atherosclerosis were established by injuring the right carotid artery endothelium with balloon and feeding with high lipid diet.Five rabbits(group A) were intravenously injected SPIO;and the other five rabbits(group B) received the same volume of saline injection.The MR imaging was performed at 24,48 and 72 hours after injection,and then,histological study was done.Results Twenty-four hours after the intravenous injection of SPIO,3 rabbits in group A showed signal intensity loss in the right carotid artery wall on T2*WI,corresponding to Perl's Prussian blue staining-positive particles in the plaques revealed by histopathological study.T2*WI change and Perl's Prussian blue staining-positive particles in the plaques were not observed in any one model in group B.Conclusion It is possible to use superparamagnetic iron-oxide (SPIO) particles as a marker of atherosclerotic plaques detected with 1.5T magnetic resonance imaging system in New Zealand white rabbit model.

Key words: atherosclerosis, magnetic resonance imaging, superparamagnetic iron-oxide(SPIO), animal experiment

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