Nanoshell-Forming Nanoparticles for Exosome Detection
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Solution Overview
Problem
Current methods for detecting exosomes in native biofluids are technically challenging due to their heterogeneity and the difficulty in distinguishing exosomes from other nanoscale vesicles and free molecules, leading to contamination and incomplete biomolecular confirmation.
Innovation Solution
A method involving nanoparticles that form a nanoshell around exosomes, allowing for optical signal measurement to detect and characterize exosomes, and the use of fluorescent molecular probes to identify associated targets through enhanced fluorescence quenching, implemented on a microfluidic chip for rapid multiplexed analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional ultracentrifugation or advanced sorting strategies are used to isolate vesicles, then vesicles of characteristic size can be separated, but the process requires extensive processing and faces contamination with other similarly sized protein aggregates
Solution Approach 1:
The patent introduces a targeting ligand-conjugated nanoparticle as an intermediary mediator that specifically binds to exosomal markers (such as CD63, CD81, or CD9) on the exosome surface. This mediator enables selective capture of exosomes from complex biofluids without requiring extensive ultracentrifugation or sorting procedures, thereby improving isolation purity while reducing processing complexity
Solution Approach 2:
The invention replaces the mechanical separation system (ultracentrifugation) with a biochemical recognition system. Instead of using high-speed mechanical forces to separate vesicles by size, the patent employs ligand-receptor binding interactions between targeting ligands and exosomal markers to achieve specific exosome isolation, eliminating the need for complex mechanical processing equipment
2Productivity
If biochemical assays use affinity enrichment to capture and measure vesicles based on common exosomal markers, then vesicles can be detected, but the method misses vesicle subpopulations and is susceptible to interference by biochemically identical but differentially organized molecular targets
Solution Approach 1:
The patent segments the detection process into multiple independent detection channels, each equipped with different targeting ligands that recognize different exosomal markers or subpopulations. This allows simultaneous detection of diverse exosome subtypes (e.g., tumor-derived exosomes, immune cell-derived exosomes) with high precision, avoiding the interference problem of conventional single-marker assays
Solution Approach 2:
The invention creates a universal detection platform that can detect multiple exosome subpopulations and biomarkers simultaneously through an array of functionalized nanoparticles. Each nanoparticle type targets specific exosomal markers, and the combined system provides comprehensive exosome analysis with high accuracy, eliminating the need for separate assays for different vesicle types
3Measurement precision
If biophysical preparation methods are used to isolate vesicles, then vesicles can be separated by size, but biomolecular confirmation of vesicle identities is lacking
Solution Approach 1:
The patent merges biophysical separation capabilities with biomolecular recognition by conjugating targeting ligands to nanoparticle surfaces. The resulting hybrid system simultaneously provides size-based physical separation through nanoparticle properties and biomolecular identity confirmation through specific ligand-exosome marker interactions, thereby retaining both size separation precision and biomolecular identity information
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables direct, multiparametric analysis of exosomal biomarkers in native biofluids, distinguishing exosomes from non-vesicle molecules and providing accurate cancer prognosis by identifying specific exosomal subpopulations, with improved sensitivity and specificity compared to conventional methods.
Implementation Method 1
contacting a sample with nanoparticles or a precursor thereof, wherein the nanoparticles or precursor are capable of binding onto the surface of a nanovesicle and form, in situ, a nanoshell that surrounds said vesicle
Implementation Method 2
irradiating the sample and measuring the optical signals of the sample to detect and/or characterise the nanovesicle in the sample
Implementation Method 3
one or more fluorescent molecular probes are capable of specifically binding to one or more targets that are bound or associated with the nanovesicle and provide a unique emitting fluorescence wavelength for each said target
Implementation Method 4
detection involves identifying an enhanced fluorescence quenching of the unique emitted fluorescence for each said target
Data Source
AI summary
The invention relates to methods for detecting and/or characterising a nanovesicle in a sample or a method of detecting a target that is bound or associated with said nanovesicle, wherein the sample is brought into contact with nanoparticles that are capable of binding on the surface of nanovesicle and form, in situ, a nanoshell that surround said nanovesicle. In a preferred embodiment, the nanovesicle is exosome labelled with fluorescent probes and the nanoparticles are gold nanoparticles (AuNP). The invention also relates to a kit or microfluidic chip for performing such methods, as well as a method of determining the prognosis of a cancer in a subject by performing such methods.