Single Extracellular Vesicle Protein Analysis Using Immuno-Droplet Digital Polymerase Chain Reaction Amplification.

Single Extracellular Vesicle Protein Analysis Using Immuno-Droplet Digital Polymerase Chain Reaction Amplification.
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DOI:
10.1002/adbi.201900307
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发表时间:
2020-12
影响因子:
4.1
通讯作者:
Weissleder R
Weissleder R
中科院分区:
生物学3区
文献类型:
--
作者:
Ko J;Wang Y;Carlson JCT;Marquard A;Gungabeesoon J;Charest A;Weitz D;Pittet MJ;Weissleder R

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There is a need for novel analytical techniques to study the composition of single extracellular vesicles (EV). Such techniques are required to improve our understanding of heterogenous EV populations, to allow identification of unique subpopulations, and to enable earlier and more sensitive disease detection. Because of the small size of EV and their low protein content, ultra-high sensitivity technologies are required. Here we describe an immuno-droplet digital PCR (iddPCR) amplification method that allows multiplexed single EV protein profiling. Antibody-DNA conjugates are used to label EV, followed by stochastic microfluidic incorporation of single EV into droplets. In situ PCR with fluorescent reporter probes converts and amplifies the barcode signal for subsequent read-out by droplet imaging. In these proof-of-principle studies it is shown that multiplex protein analysis is possible in single EV, opening the door for future analyses. An immuno droplet digital PCR (iddPCR) method has been developed for multiplexed single EV protein profiling. Antibody-DNA conjugates are used to label EV and labeled single EV are encapsulated into droplets. Using PCR, DNA barcodes are amplified for imaging based readout. It has shown that multiplex protein analysis is possible in single EV, opening the door for future analyses.
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