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Biocompatible quantum dot-antibody conjugate for cell imaging, targeting and fluorometric immunoassay: crosslinking, characterization and applications

机译:用于细胞成像的生物相容性量子点 - 抗体缀合物,靶向和荧光免疫测定:交联,表征和应用

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Quantum dots (QDs) are important fluorescent probes that offer great promise for bio-imaging research due to their superior optical properties. However, QDs for live cell imaging and the tracking of cells need more investigation to simplify processing procedures, improving labeling efficiency, and reducing chronic toxicity. In this study, QDs were functionalized with bovine serum albumin (BSA) via a chemical linker. Anti-human immunoglobulin antibodies were oxidized by sodium periodate to create reactive aldehyde groups for a spontaneous reaction with the amine groups of BSA-modified QDs. An antibody-labeled QD bioconjugate was characterized using agarose gel electrophoresis, dynamic light scattering, and zeta potential. Using fluorescence spectroscopy, we found that the fluorescence of QDs was retained after multiple conjugation steps. The cell-labeling function of the QD bioconjugate was confirmed using an image analyzer and confocal microscopy. The QD bioconjugate specifically targeted human immunoglobulin on the membrane surface of recombinant cells. In addition, the QD bioconjugate applied in fluorometric immunoassay was effective for the quantitative analysis of human immunoglobulin in an enzyme-linked immunosorbent assay. The developed QD bioconjugate may offer a promising platform to develop biocompatible tools to label cells and quantify antibodies in the immunoassay.
机译:量子点(QDS)是重要的荧光探针,为其优越的光学性质而言,对生物成像研究提供了极大的承诺。然而,用于活细胞成像的QD和细胞的跟踪需要更多的研究来简化处理程序,提高标记效率,并降低慢性毒性。在该研究中,QD通过化学接头用牛血清白蛋白(BSA)官能化。通过钠周期氧化抗人免疫球蛋白抗体,以产生与BSA改性QD的胺基的自发反应的反应性醛基。使用琼脂糖凝胶电泳,动态光散射和Zeta电位表征抗体标记的QD生物缀合物。使用荧光光谱检查,我们发现在多个缀合步骤后保留QD的荧光。使用图像分析仪和共聚焦显微镜确认QD生物缀合物的细胞标记功能。 QD生物缀合物在重组细胞的膜表面上特别靶向人免疫球蛋白。此外,施加在荧光免疫测定中的QD生物缀合物对于酶联免疫吸附试验中的人免疫球蛋白的定量分析是有效的。发达的QD BioConjugate可以提供有希望的平台,可使生物相容性工具开发用于标记细胞并量化免疫测定中的抗体。

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    《RSC Advances》 |2019年第56期|共13页
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  • 正文语种 eng
  • 中图分类 化学;
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