Temperature-Responsive EV Detachment for Specific Vesicle Purification
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Solution Overview
Problem
Existing methods for isolating extracellular vesicles from crude solutions fail to recover specific vesicles without damaging them, leading to potential vesicle damage during the separation process.
Innovation Solution
An extracellular vesicle detachment agent utilizing a temperature-responsive polymer with specific constitutional units and a separation carrier-binding site, allowing for controlled detachment of vesicles through temperature-induced polymer expansion and contraction, combined with a purification method involving binding, reaction, and stirring to separate vesicles from carriers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If high-temperature treatment or high-concentration ion treatment is used to cleave antigen-antibody bonds, then specific extracellular vesicles can be separated, but the extracellular vesicles are damaged
Solution Approach 1:
The invention changes the parameter of detachment conditions from high-temperature/high-concentration ions to physiological temperature and pH conditions. The antibody is engineered with a temperature-responsive polymer that undergoes conformational changes at physiological temperatures, enabling antigen-antibody bond cleavage without harsh conditions that would damage extracellular vesicles.
Solution Approach 2:
The invention creates a composite material by conjugating a temperature-responsive polymer to an antibody. This composite structure combines the specific binding capability of the antibody with the temperature-responsive conformational changes of the polymer, enabling controlled detachment under mild conditions while maintaining extracellular vesicle integrity.
2Reliability
If chelating agents are used to cleave Tim4-PS bonds, then all extracellular vesicles can be recovered intact, but specific extracellular vesicle isolation is not possible
Solution Approach 1:
The invention applies local quality by using antibodies with specific antigen specificity rather than general Tim4 proteins. The antibody is conjugated to a temperature-responsive polymer, creating a localized functional structure that provides both specific binding to target antigens and controlled detachment capability, enabling specific extracellular vesicle isolation while maintaining integrity.
3Reliability
If 500 mM inorganic salt aqueous solution is used to cleave peptide-PS bonds, then all extracellular vesicles can be recovered intact, but specific extracellular vesicle isolation is not possible
Solution Approach 1:
The invention applies local quality by using antibodies with specific antigen specificity rather than general peptides. The antibody is conjugated to a temperature-responsive polymer, creating a localized functional structure that provides both specific binding to target antigens and controlled detachment capability, enabling specific extracellular vesicle isolation while maintaining integrity.
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 agent enables the recovery of specific extracellular vesicles without damage, maintaining their integrity, and provides a high-purity purification method.
Implementation Method 1
the expansion and/or contraction of polymer chains due to temperature response of a temperature responsive polymer can be used as a driving force to detach extracellular vesicles
Data Source
AI summary
The present invention provides an extracellular vesicle detachment agent containing a polymer containing a constitutional unit A represented by the following formula (1) and a constitutional unit B represented by the following formula (2) in a molar ratio of 0.8≤A/(A+B), having a number average molecular weight of 20,000 to 1,000,000, and further containing a separation carrier-binding site at an end thereof: (in the above-mentioned formula (1), R1 is a hydrogen atom or a methyl group and in the above-mentioned formula (2), R2 is a hydrogen atom or a methyl group).