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Simultaneous Detection of Exosomal Membrane Protein and RNA by Highly Sensitive Aptamer Assisted Multiplex–PCR

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journal contribution
posted on 11.11.2019, 16:12 by Zaizai Dong, Chuanhao Tang, Zhen Zhang, Wei Zhou, Rong Zhao, Lina Wang, Jiachao Xu, Yayun Wu, Jiang Wu, Xing Zhang, Li Xu, Libo Zhao, Xiaohong Fang
Exosomes, which are 30–150 nm extracellular vesicles containing a variety of biomolecules (i.e., proteins, RNA, DNA, and lipids), have emerged as important analytes in liquid biopsy. Although exosome detection offers a valuable chance to understand disease status in a multidimensional manner, comprehensive analysis of different exosomal biomolecules with limited specimens remains a challenge. Herein, we introduced an aptamer-based PCR (polymerase chain reaction) platform and realized highly sensitive detection of CD63 protein positive exosomes as low as 50 particles/μL. More importantly, simultaneous analysis of exosomal RNA and surface protein is available using this method. In a proof of concept experiment, simultaneous detection of two immunotherapy-related biomarkers, programmed death-ligand 1 (PD-L1) protein and indoleamine 2,3-dioxygenase 1 (IDO1) mRNA, was demonstrated with clinical samples. Our method provides a strategy for the comprehensive analysis of exosomes, with the advantages of high sensitivity and practicability.