Quantum dot imaging platform for single-cell molecular profiling.

Quantum dot imaging platform for single-cell molecular profiling.
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DOI:
10.1038/ncomms2635
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发表时间:
2013
影响因子:
16.6
通讯作者:
--
中科院分区:
综合性期刊1区
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正常细胞生理学和疾病发病机制的研究在很大程度上依赖于解开细胞内分子机制和途径的复杂性。为了实现这一目标,需要在微环境的背景下对单个细胞进行全面的分子分析。在这里,我们报告了一个多色multicolour原位成像技术的发展,能够创建详细的定量分子个人资料的光学成像的分辨率为单个细胞。化学计量荧光探针库通过在快速和简单的程序中经由蛋白A将靶特异性抗体连接到基于通用量子点的平台来制备。令人惊讶的是,尽管蛋白A和抗体之间存在多价结合的可能性以及这种非共价键的中等亲和力,但完全组装的探针不会聚集或交换抗体,从而促进高度多重的平行染色。这种单细胞分子谱分析技术有望在系统生物学、基因表达研究、信号通路分析和分子诊断方面开辟新的机会。 单个细胞的多重标记允许直接观察细胞内的分子组成,但难以用现有技术实现。在这里,自组装的荧光纳米粒子探针和多色multicolour染色被用于在亚细胞分辨率的多个生物分子的同时评价。
Study of normal cell physiology and disease pathogenesis heavily relies on untangling the complexity of intracellular molecular mechanisms and pathways. To achieve this goal, comprehensive molecular profiling of individual cells within the context of microenvironment is required. Here we report the development of a multicolour multicycle in situ imaging technology capable of creating detailed quantitative molecular profiles for individual cells at the resolution of optical imaging. A library of stoichiometric fluorescent probes is prepared by linking target-specific antibodies to a universal quantum dot-based platform via protein A in a quick and simple procedure. Surprisingly, despite the potential for multivalent binding between protein A and antibody and the intermediate affinity of this non-covalent bond, fully assembled probes do not aggregate or exchange antibodies, facilitating highly multiplexed parallel staining. This single-cell molecular profiling technology is expected to open new opportunities in systems biology, gene expression studies, signalling pathway analysis and molecular diagnostics. Multiplexed labelling of individual cells allows the direct observation of intracellular molecular composition, but is difficult to achieve with existing techniques. Here, self-assembled fluorescent nanoparticle probes and multicolour multicycle staining are used for the simultaneous evaluation of multiple biomolecules at subcellular resolution.
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