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首页> 外文期刊>Journal of Clinical Ultrasound: JCU >Molecular imaging of vulnerable plaques in rabbits using contrast-enhanced ultrasound targeting to vascular endothelial growth factor receptor-2.
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Molecular imaging of vulnerable plaques in rabbits using contrast-enhanced ultrasound targeting to vascular endothelial growth factor receptor-2.

机译:使用对比增强超声靶向血管内皮生长因子受体2的家兔易损斑块的分子成像。

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PURPOSE: Increased neovascularization has been identified as a feature of atherosclerotic plaque vulnerability and can be traced by microbubble ultrasound contrast agents (UCA). We investigated the relationship between retention of a vascular endothelial growth factor receptor 2 (VEGFR-2) targeted UCA and VEGFR-2 expression in a vulnerable plaque model in rabbits. METHODS: Microbubbles targeting to VEGFR-2 were prepared by conjugation of biotinylated microbubbles with biotinylated VEGFR-2 antibody via streptavidin. Vulnerability was created by delivering recombinant p53 adenovirus to atherosclerotic plaques obtained in abdominal aorta by a high cholesterol diet and balloon endothelial injury. Twelve week later, the average video intensity of pre- and postcontrast ultrasound images was measured. VEGFR-2 expression and vascular density were quantified by immunohistochemical staining. RESULTS: Retention of targeted UCA in plaques was higher than that of nontargeted UCA (144 +/- 18 dB versus 107 +/- 9 dB; Z= -3.984, p = 0.000). VEGFR-2 expression was correlated with video intensity of targeted (r(2) = 0.78, p = 0.001), but not of nontargeted, UCA (r(2) = 0.17, p >/= 0.05). CONCLUSIONS: The magnitude of the sonographic signal from retained VEGFR-2 targeted UCA correlates with VEGFR-2 expression. These results validate the use of targeted UCA for sonographic imaging of vulnerable abdominal artery plaques in rabbits.
机译:目的:新血管形成的增加已被认为是动脉粥样硬化斑块易损性的特征,可以通过微泡超声造影剂(UCA)进行追踪。我们调查了兔脆弱斑块模型中靶向血管内皮生长因子受体2(VEGFR-2)的UCA保留和VEGFR-2表达之间的关系。方法:通过链霉亲和素将生物素化的微泡与生物素化的VEGFR-2抗体结合,制备靶向VEGFR-2的微泡。通过向高胆固醇饮食和球囊内皮损伤在腹主动脉中获得的动脉粥样硬化斑块中递送重组p53腺病毒来产生漏洞。十二周后,测量了造影前后超声图像的平均视频强度。通过免疫组织化学染色定量VEGFR-2表达和血管密度。结果:目标UCA在斑块中的保留率高于非目标UCA(144 +/- 18 dB对107 +/- 9 dB; Z = -3.984,p = 0.000)。 VEGFR-2表达与靶向的视频强度相关(r(2)= 0.78,p = 0.001),但与非靶向的UCA无关(r(2)= 0.17,p> / = 0.05)。结论:保留的VEGFR-2靶向UCA的超声信号强度与VEGFR-2表达相关。这些结果验证了靶向UCA在兔脆弱腹动脉斑块的超声检查中的应用。

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