Lipid-Based Probes for Extracellular Vesicle Isolation
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Solution Overview
Problem
Current methods for isolating extracellular vesicles, such as ultracentrifugation and immunoisolation, are lengthy and can lead to impurities and damage to nanoscale EVs, necessitating a more efficient and effective approach for capturing and isolating these vesicles for downstream molecular analyses.
Innovation Solution
A lipid-based probe system comprising a labelling probe with a lipid tail and spacer, which combines with the lipid bilayer of extracellular vesicles, allowing for their capture and immobilization on a substrate or with a capture probe, enabling efficient isolation and analysis of EV contents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ultracentrifugation is used to isolate extracellular vesicles, then isolation can be achieved, but the process is lengthy and can lead to impurities and nEV damage
Solution Approach 1:
The patent introduces lipid-based probes as intermediary molecules that specifically bind to the lipid bilayer of extracellular vesicles. These probes act as mediators between the vesicles and the isolation system, enabling selective capture without the need for lengthy ultracentrifugation processes. The probes functionalized with affinity tags facilitate direct binding and isolation, significantly reducing isolation time while maintaining high purity and integrity of nanoscale EVs.
2Measurement precision
If immunoisolation is used to capture extracellular vesicles, then specific isolation can be achieved, but the protocol is lengthy and can cause nEV damage
Solution Approach 1:
The patent changes the binding parameter from protein-antibody interactions (immunoisolation) to lipid-probe interactions. The lipid-based probes exploit the universal lipid bilayer structure of all extracellular vesicles, enabling broad-spectrum capture without requiring specific surface protein markers. This parameter change simplifies the protocol while maintaining high isolation specificity and reducing the risk of vesicle damage associated with complex immunoisolation procedures.
3Productivity
If polymer-based precipitation is used to isolate extracellular vesicles, then isolation can be achieved, but impurities are introduced
Solution Approach 1:
The patent employs lipid-based probes with affinity tags (such as biotin) as intermediary molecules that specifically target and bind to extracellular vesicles. The probes are designed to attach to the lipid bilayer without introducing impurities, and the affinity tags enable selective capture on coated surfaces or magnetic beads. This intermediary approach maintains high isolation efficiency while ensuring purity, avoiding the contamination issues associated with polymer-based precipitation methods.
4Quantity of substance
If filtration is used to separate extracellular vesicles, then isolation can be achieved, but nEV damage occurs
Solution Approach 1:
The patent replaces mechanical filtration systems with a biochemical binding system based on lipid-probe interactions. Instead of forcing vesicles through physical filters that can damage nanoscale EVs, the method uses chemical affinity between lipid-based probes and the vesicle lipid bilayer. This substitution of mechanical separation with biochemical specific binding preserves vesicle integrity while maintaining high isolation yield, as the gentle binding process does not subject vesicles to shear stress or physical deformation.
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
The lipid-based probe system enables rapid and efficient isolation of extracellular vesicles with high efficiency, minimizing damage and impurities, and allows for detailed analysis of their contents, including nucleic acids and proteins, facilitating their use as diagnostic and therapeutic targets.
Implementation Method 1
The labelling probe is configured to combine with a lipid bilayer of the extracellular vesicles
Implementation Method 2
The labeled extracellular vesicles can be captured with a capture probe configured to combine with the labelling probe
Data Source
AI summary
Lipid-based probes and systems therewith to capture and isolate extracellular vesicles from a sample are disclosed. The system can include a labelling probe-capture probe combination or an immobilized labelling probe on a surface of a substrate or a device including the immobilized labelling probe on a surface of a substrate. The labelling probe can include a lipid tail for insertion in the lipid bilayer membrane of extracellular vesicles. The labelling probe can further include a tag that can be readily combine with a capture probe or a high affinity component to bind to a substrate surface to immobilize the labelling probe, and a spacer between the lipid tail and tag or high affinity component.