两亲性聚乙烯亚胺修饰量子点构建功能性光学探针用于干细胞治疗的示踪研究

Acta Medicinae Universitatis Scientiae et Technologiae Huazhong(2015)

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Abstract
目的:制备新型分子影像探针标记间充质干细胞,以实现细胞荧光成像。方法应用1‐碘十二烷修饰聚乙烯亚胺,构建两亲性大分子。利用大分子自组装性能,包裹疏水性核壳结构CdSe/CdS量子点构建纳米探针。结果该探针在630 nm处呈现出较强的荧光信号,能够促使间充质干细胞高效内吞。体内成像结果显示,与空白对照细胞相比,被标记细胞呈现出显著的光学信号,空白组信号值为1.47 e8[p/s/cm2/sr]/[μW/cm2],实验组信号值为2.78 e8[p/s/cm2/sr]/[μW/cm2]。结论该纳米探针具有良好光学成像性能,可实现细胞标记。
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Key words
polyethyleneimine,quantum dots,fluorescence imaging,stem cell therapy
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