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岭南现代临床外科 ›› 2019, Vol. 19 ›› Issue (02): 154-161.DOI: 10.3969/j.issn.1009-976X.2019.02.007

• 论著与临床研究 • 上一篇    下一篇

偶联多种单链抗体免疫纳米微粒的制备方法及鉴定

邹金茂, 李若梦, 练国达, 陈少杰, 陈茵婷*, 黄开红*   

  1. 中山大学孙逸仙纪念医院
  • 通讯作者: 陈茵婷, 黄开红
  • 基金资助:
    国家自然科学基金;国家自然科学基金;国家自然科学基金;广东省自然科学基金;广东省自然科学基金;广东省医学科研基金;广东省医学科研基金;广州市科技计划项目;广州市科技珠江科技新星专项;中央高校基本科研业务费专项资金资助

Preparation and identification of multi single chain antibodies modified immune nanoparticles

ZOU Jinmao, LI Ruomeng, LIAN Guoda, CHEN Shaojie, CHEN Yinting, HUANG Kaihong   

  1. Department of Gastroenterology, Sun Yat?Sen Memorial Hospital, Sun Yat?Sen University, Guangzhou, 510120, China
  • Online:2019-04-20 Published:2019-04-20
  • Contact: CHEN Yinting, HUANG Kaihong
  • Supported by:
    The National Natural Science Fund; The National Natural Science Fund; The National Natural Science Fund; Natural Science Foundation of Guangdong Province; Natural Science Foundation of Guangdong Province;Medical Scientific Research Foun of Guangdong Province;Medical Scientific Research Foun of Guangdong Province;Guangzhou Science and Technology Pearl River Technology Star Special Project;Funded by the special fund for basic scientific research in central colleges and universities

摘要: 【摘要】 目的 建立一种多单链抗体修饰氧化铁纳米微粒的方法。方法 利用聚乙二醇(polyethylene glycol, PEG)及羧基(COOH group)修饰的氧化铁纳米微粒(Iron Oxide Nanoparticles, IONPs),以及抗MUC4、抗CEACAM6及抗CD44v6单链抗体(Single chain antibodies, scAbs),通过EDC/Sulfo?NHS交联剂将IONPs?PEG与3种scAbs进行交联,构建IONPs?PEG?multi scAbs复合物,再利用zeta粒度仪、透射电子显微镜(TEM)对IONPs?multi scAbs复合物进行表征,同时,在IONPs?PEG表面偶联荧光抗体,通过荧光强度测定其偶联效率;再鉴定复合物的抗原识别特异性及在放置1个月、6个月后评估复合物水溶液稳定性。结果 偶联3种scAbs后,IONPs?PEG?multi scAbs复合物的平均粒径为(23.6±0.5) nm,粒径分布集中,zeta电位约(?17.3±06) mV;TEM显示粒径约10 nm,荧光强度测定结果提示抗体偶联效率约为75%,细胞免疫荧光实验结果提示IONPs?PEG?multi scAbs复合物对高表达MUC4、CEACAM6及CD44v6分子的胰腺癌细胞BxPC?3具有特异性识别能力,证实该复合物具有良好的抗原识别特异性;在放置1个月、6个月后,偶联复合物的溶液分散性良好,放置6个月后平均粒径约(23.9±0.8) nm,zeta电位约(?17.6±0.4) mV,TEM拍照提示粒径约10 nm,细胞免疫荧光提示复合物抗原识别特异性良好。结论 本研究利用EDC/Sulfo?NHS交联剂组合,将3种单链抗体交联到PEG和羧基修饰的IONPs表面,构建IONPs?PEG?multi scAbs复合物,该方法偶联效率高,且复合物具有粒径小、分散性好、抗原识别特异性及水溶液稳定性好的特性。

关键词: 纳米微粒, 表面修饰, 方法, 多种单链抗体

Abstract: 【Abstract】 Objective To establish a method for conjugating multi single chain antibodies to iron oxide nanoparticles. Methods Iron Oxide Nanoparticles (IONPs) coated with polyethylene glycol (PEG) and carboxyl functional group (COOH group) was conjugated with anti?MUC4, anti?CEACAM6 and anti?CD44v6 single chain antibodies (scAbMUC4, scAbCEACAM6, scAbCD44v6) under the action of cross?linking agents of EDC/Sulfo?NHS. After the construction of IONPs?PEG?multi scAbs complex, dynamic light scattering (DLS) and transmission electron microscopy (TEM) were used to characterize the complex. Besides, by coupling fluorescein labeled monoclonal antibody to the surface of IONPs?PEG, the fluorescence intensity of the IONPs?mAbs complex was measured, and the coupling efficiency was calculated. Cellular immunofluorescence assays were used to identify the specificity of IONPs?multi scAbs complex, and the aqueous solution stability of the complex was also evaluated by DLS, TEM and cellular immunofluorescence experiments at the timepoint of one month and six month after construction. Results After coupling three kinds of scAbs to IONPs?PEG, the hydrodynamic particle size of IONPs?PEG?multi scAbs complex was (23.6±0.5) nm, and the particle size distribution was concentrated, zeta potential was (?17.3±0.6) mV. TEM showed that the average particle size of IONPs?PEG?multi scAbs complex was about 10 nm. The results showed that the antibody coupling efficiency was about 75.5%. The results of cellular immunofluorescence showed that the IONPs?PEG?multi scAbs complex had specific recognition ability for BxPC?3 cells with high expression of MUC4, CEACAM6 and CD44v6. After storage for 1 and 6 months in aqueous solution, the hydrodynamic particle size, zeta potential, TEM photograph and cellular immunofluorescence of the complex were not significantly different from those obtained immediately after preparation. Conclusion In this study, the EDC/Sulfo?NHS crosslinker combination was used to conjugate the three kinds of scAbs to the surface IONPs?PEG to construct IONPs?PEG?multi scAbs complex. This coupling method has high conjugation efficiency and formed a complex with ultra?small particle size, uniform distribution and excellent antigen recognition specificity, as well as good aqueous solution stability.

Key words: nanoparticles, modification, multi single chain antibody, method

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