Tumor-derived
extracellular vesicles (EVs) carry tumor-specific
proteins and RNAs, thus becoming prevalent targets for early cancer
diagnosis. However, low expression of EV cargos and insufficient diagnostic
power of individual biomarkers hindered EVs application in clinical
practice. Herein, we propose a multiplex Codetection platform of proteins
and RNAs (Co-PAR) for EVs. Co-PAR adopted a pair of antibody-DNA probes
to recognize the same target protein, which in turn formed a double-stranded
DNA. Thus, the target protein could be quantified by detecting the
double-stranded DNA via qPCR. Meanwhile, qRT-PCR simultaneously quantified
the target RNAs. Thus, with a regular qPCR instrument, Co-PAR enabled
the codetection of multiplex proteins and RNAs, with the sensitivity
of 102 EVs/μL (targeting CD63) and 1 EV/μL
(targeting snRNA U6). We analyzed the coexpressions of three protein
markers (CD63, GPC-1, HER2) and three RNA markers (snRNA U6, GPC-1
mRNA, miR-10b) on EVs from three pancreatic cell lines and 30 human
plasma samples using Co-PAR. The diagnostic accuracy of the 6-biomarker
combination reached 92.9%, which was at least 6.2% higher than that
of 3-biomarker combinations and at least 13.5% higher than that of
6 single biomarkers. Co-PAR, as a multiparameter detection platform
for EVs, has great potential in early disease diagnosis.