首页|ExoPRIME: Solid-phase immunoisolation and OMICS analysis of surface-marker-specific exosomal subpopulations
ExoPRIME: Solid-phase immunoisolation and OMICS analysis of surface-marker-specific exosomal subpopulations
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NSTL
Elsevier
Exosomes encapsulate genomic and proteomic biomarkers for non-invasive diagnosis and disease monitoring. However, exosome surface-markers heterogeneity is a major drawback of current isolation methods. Here, we report a direct, one-step exosome sampling technology, ExoPRIME, for selective capture of CD63(+) exosome subpopulations using an immune-affinity protocol. Microneedles (300 mu m x 30 mm), functionalized with anti-CD63 antibodies, were incubated under various experimental conditions in conditioned astrocyte medium and astrocyte-derived exosome suspension. The probe's capture efficiency and specificity were validated using FluoroCet assay, immunofluorescent imaging, and OMICS analyses. Significantly higher exosomes were captured by probes incubated for 16 hat 4 C-0 in enriched exosomal suspension (23 x 10(6) exosomes per probe) vis-a-vis 2 hat 4 C-0 (12 x 10(6)) and 16 hat 22 C-0 (3 x 10(6)) in conditioned cell media. Our results demonstrate the application of ExoPRIME over a broad dynamic range of temperature and incubation parameters, offering flexibility for any desired application. ExoPRIME permits the use and re-use of minimal sample volumes (<= 200 mu L) can be multiplexed in arrays, and integrated into a lab-on-a-chip platform to achieve parallel, high-throughput isolation of different exosome classes in a semi-automated workstation. This platform could provide direct exosomal analysis of biological fluids since it can elegantly interface with existing room-temperature, picomolar-range nucleic acid assays to provide a clinical diagnostic tool at the point of care.
NSTL
Elsevier
