超偏磁铁氧化物纳米粒子标记外细胞囊泡用于缺血性中风的磁共振成像
Shannon Helsper1,2, Xuegang Yuan1,2, Richard Jeske2
1National High Magnetic Field Laboratory, Florida State University, Tallahassee, FL, 32310, United States of America (USA).
概括
人类介质干细胞衍生的细胞外囊 (hMSC-EVs) 被标记为超微型超偏磁铁氧化物 (USPIO) 纳米颗粒,可改善中风恢复. 聚乙烯甘醇 (PEG) 丰富方法增强MRI对比度,以更好地跟踪治疗性EVs.
科学领域:
- 生物医学工程 生物医学工程
- 再生医学是一种再生医学.
- 纳米技术 纳米技术
背景情况:
- 脑卒中仍然是全球死亡和残疾的重要原因.
- 人类介质干细胞衍生的细胞外囊泡 (hMSC-EVs) 显示出对中风的治疗潜力.
- 对EV的有效跟踪对于优化基于细胞的疗法至关重要.
研究的目的:
- 开发和评估使用超微型超偏磁铁氧化物 (USPIO) 纳米粒子用于MRI跟踪的hMSC-EVs的标签策略.
- 为了比较USPIO标记的hMSC-EV的两种净化方法:超离心和聚乙烯糖醇 (PEG) 丰富.
- 在缺血性中风模型中评估标记EVs的生物分布,MRI对比度增强和治疗疗效.
主要方法:
- 通过超声波,hMSC-EVs被标记为USPIO纳米粒子.
- 采用了两种净化方法:超离心和基于PEG的丰富.
- 被标记的EVs在使用MRI的缺血性中风模型中进行了体外表征和体内评估.
主要成果:
- 通过体外评估证实了hMSC-EV的USPIO标签.
- 与单独的超离心法相比,PEG丰富方法在MRI对比度增强了3.6倍.
- 标有USPIO标签的EV允许在中风模型中可视化生物分布和评估治疗潜力.
结论:
- 同时的USPIO纳米粒子标签和基于PEG的EV丰富显著提高MRI对比度.
- 这种综合方法改善了基于EV的中风治疗方法的跟踪和交付评估.
- 开发的标签和丰富策略对推进基于电动汽车的中风疗法充满希望.
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