Synthetic Extracellular Vesicle Assembly for Size and Composition Control
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Solution Overview
Problem
Current methods for producing synthetic extracellular vesicles are inefficient, lack control over composition and size, and result in low purity and reproducibility, making them unsuitable for therapeutic and diagnostic applications.
Innovation Solution
A high-throughput bottom-up assembly method using charge-mediated assembly of predefined functionalized lipid vesicles encapsulated within a polymer shell, allowing precise control over lipid and protein ratios, and encapsulation of nucleic acids, with emulsification to stabilize and adjust vesicle dimensions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If top-down methodologies are used to produce synthetic extracellular vesicles, then the production process is simpler, but the control over composition and size is poor and purity is low
Solution Approach 1:
The production process is divided into two distinct stages: top-down generation of membrane fragments from cells, and bottom-up self-assembly of these fragments into vesicles with controlled composition. This segmentation allows each stage to be optimized independently, achieving both simplicity and precision.
Solution Approach 2:
Membrane fragments are prepared in advance with predefined lipid and protein compositions before vesicle assembly. This preliminary preparation enables precise control over the final vesicle composition without complicating the overall production process.
2Productivity
If conventional emulsification methods are used, then production throughput is high, but vesicle size homogeneity is poor
Solution Approach 1:
The patent optimizes emulsification parameters including oil phase composition (using specific lipids like DSPC and cholesterol), water-to-oil ratio, emulsification speed, and temperature to achieve both high throughput and uniform vesicle size distribution.
Solution Approach 2:
A composite lipid mixture containing multiple components (DSPC, cholesterol, DSPG) is used in the oil phase to create vesicles with improved size homogeneity while maintaining high production efficiency through the emulsification process.
3Ease of manufacture
If passive encapsulation during membrane fragment self-assembly is used, then cargo loading is simple, but encapsulation efficiency and control are poor
Solution Approach 1:
Nucleic acid cargo is incorporated into the membrane fragments during their preparation before vesicle assembly. This preliminary incorporation ensures high encapsulation efficiency and controlled cargo distribution throughout the vesicle population.
Solution Approach 2:
The cargo loading process is optimized locally within the membrane fragment preparation stage, allowing different lipid compositions and cargo types to be incorporated into specific fragments that will subsequently self-assemble into vesicles with tailored encapsulation properties.
4Reliability
If traditional purification steps are used for extracellular vesicle isolation, then separation is achieved, but the process is time-consuming with low purity and yield
Solution Approach 1:
The patent extracts and removes contaminants including free lipids, protein aggregates, and non-vesicular particles through optimized centrifugation and filtration steps, achieving high purity vesicle preparations quickly without sacrificing yield.
Solution Approach 2:
Centrifugation parameters (speed, time, temperature) and filtration conditions are optimized to achieve rapid separation of vesicles from contaminants, reducing purification time while maintaining high purity and yield.
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 method produces stable, homogenous, and reproducible synthetic extracellular vesicles with high purity and encapsulation efficiency, suitable for therapeutic applications and fundamental biological studies.
Implementation Method 1
producing polymer shell-stabilized synthetic extracellular vesicles by emulsifying the combined phases of step c) using a mechanic or electronic emulsifier
Implementation Method 2
providing an amphiphilic copolymer dissolved in an oil phase... wherein the amphiphilic copolymer forms a polymer shell stabilizing the synthetic extracellular vesicle
Implementation Method 3
wherein the one or two hydrophobic polymer blocks are arranged at the outer side and the hydrophilic polymer block is arranged at the inner side of the polymer shell
Implementation Method 4
A high-throughput bottom-up assembly method using charge-mediated assembly of predefined functionalized lipid vesicles
Data Source
AI summary
The present invention relates to a method for producing synthetic extracellular vesicles comprising a lipid bilayer including at least two lipids, one or more extracellular vesicle associated proteins, and optionally one or more nucleic acid molecules. The inventive synthetic extracellular vesicles are formed by emulsification using a mechanic emulsifier in the form of polymer shell stabilized synthetic extracellular vesicles. The inventive method allows producing synthetic extracellular vesicles miming the composition and function of natural extracellular vesicles. Therefore, synthetic extracellular vesicles with specific protein and nucleic acids compositions are also disclosed herein, as well as their therapeutic uses.