Mesothelin抗体修饰的纳米探针对人胰腺癌细胞BxPC3的体外靶向研究

In vitro study on mesothelin antibody-tagged nanoprobe targeting human pancreatic cell line BxPC3

目的 探讨间皮素（Mesothelin）抗体修饰的荧光纳米Fe3O4@SiO2探针对人胰腺癌细胞BxPC3的靶向性能.方法 经St（o）ber法制备Fe3O4@SiO2磁核,再依次交联CdTe量子点和Mesothelin抗体,获得靶向荧光Fe3O4@SiO2纳米探针.在体外将荧光纳米Fe3O4@SiO2探针与BxPC3细胞共孵育30 min,以低表达Mesothelin的HepG-2和K562细胞作为对照,通过电荷耦合器件（CCD）成像系统和磁分离技术评估探针与癌细胞的靶向吸附性能.结果 制备的荧光纳米Fe3O4@SiO2探针颗粒大小均匀,粒径主要为120 ～ 140 nm.未交联抗体的探针与BxPC3、HepG-2、K562细胞的吸附效率均低于20％,为非特异性吸附.交联Mesothelin抗体的探针与BxPC3、HepG-2、K562细胞的吸附效率分别为（53.9±1.8）％、（8.0±2.1）％、（8.9±2.3）％,其与BxPC3细胞的吸附能力显著提高.结论 Mesothelin抗体修饰的纳米探针可有效识别高表达Mesothelin的BxPC3细胞.

Objective To observe the targeted function of a mesothelin antibody modified nanoprobe in human pancreatic cancer BxPC3 cell.Methods The Fe3O4@SiO2 nanoprobe was prepared by St（o）ber method,and then quantum dots （CdTe） and mesothelin antibody was crosslinked to obtain the properties of targeting and fluorescent.Fluorescent nano Fe3O4@SiO2 probes and BxPC3 cells were incubated in vitro for 30 min.Its targeting performance was tested by the CCD imaging system and magnetic separation technology.HepG-2 and K562 cells with low expression of mesothelin were selected as reference cells.Results This preparation method of nanoprobe could produce a uniform and narrow distribution particle with particle size mainly ranging from 120 to 140 nm.The cell adsorption experiments showed that the adsorption efficiency of BxPC3,HepG-2 and K562 by nanoprobe without crosslinking antibody were less than 20%,as a non-specific adsorption; and the adsorption efficiency of BxPC3,HepG-2 and K562 by crosslinking mesothelin antibody nanoprobe were （53.9 ± 1.8） %,（8.0 ± 2.1） % and （8.9 ± 2.3） % respectively,and the adsorption capacity with BxPC3 was significantly increased.Conclusions The nanoprobe modified by mesothelin antibody can effectively recognize BxPC3 cells which highly expressing mesothelin.