Poly(beta-amino ester) Transfection of Large Cargo
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Solution Overview
Problem
Current transfection methods are inefficient for introducing large cargo, such as mitochondria, into cells, particularly for in vivo applications, and often result in low yield and cell viability issues, limiting their effectiveness in treating mitochondrial diseases.
Innovation Solution
The use of poly(beta-amino esters) (PBAEs) to form complexes with large cargo, allowing for efficient cellular uptake and release of cargo like mitochondria without the need for mechanical force, by reacting a primary amine with a di(acrylate ester) to create a PBAE molecule that can be end-capped and mixed with an isotonic buffer for in vivo administration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional transfection techniques are used to introduce large cargo such as mitochondria into cells, then the transfection process can be performed, but the yield and cell viability are poor
Solution Approach 1:
The patent uses poly(beta-amino esters) (PBAEs) as an intermediary substance to mediate the transfection process. PBAEs form complexes with large cargo such as mitochondria, enabling their efficient delivery into cells without direct mechanical force application. The polymer acts as a carrier that protects the cargo during transit and facilitates cellular uptake, thereby improving both yield and cell viability simultaneously
2Productivity
If mechanical force techniques are applied to improve transfection yield of large cargo, then the yield increases, but the procedures must be performed ex-vivo requiring cell extraction and transfer
Solution Approach 1:
The patent replaces mechanical force-based transfection systems with a chemical-based PBAE polymer system. Instead of applying external mechanical force to drive cargo into cells, the invention uses biochemical interactions between PBAEs and cellular membranes to achieve spontaneous uptake. This substitution eliminates the need for complex ex-vivo procedures while maintaining high transfection efficiency
Solution Approach 2:
The PBAE-cargo complexes exhibit self-service characteristics by spontaneously interacting with and being taken up by cells without requiring external mechanical intervention. The complexes autonomously navigate to and enter target cells through biochemical recognition and membrane interaction, simplifying the overall procedure and enabling in-vivo application
3Reliability
If transfection methods are optimized for small molecules such as DNA and RNA, then the transfection efficiency is good, but the methods are not effective for large cargo such as mitochondria
Solution Approach 1:
The patent develops PBAEs with universal transfection capability that can handle both small molecules like DNA/RNA and large cargo such as mitochondria, viruses, and bacteria. The polymer's structural properties and interaction mechanisms are adaptable to cargo of varying sizes, making a single transfection system versatile across multiple cargo types and eliminating the need for method optimization based on cargo size
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
PBAEs enable the successful transfection of large cargo into cells, improving yield and cell viability, and allowing for in vivo treatment of diseases by forming stable complexes that facilitate cellular uptake and release, surpassing the limitations of existing methods.
Implementation Method 1
forming a complex of the cargo with a poly(beta-amino ester) (PBAE) molecule
Data Source
AI summary
Methods are provided for transfecting cells with large cargo using a poly(beta-amino ester) (PBAE) molecule, and achieving high efficiency and viability. A method is provided of transfecting cells with a cargo, by forming a complex of the cargo with a (PBAE) molecule, mixing the complex with a first buffer and contacting the complex with the cells, wherein the cargo has a dimension of at least 0.1 μm. The PBAE molecule may be formed by reacting an amine with a di(acrylate ester). In some aspects, the PBAE molecule is poly(1,4-butanediol diacrylate-co-4-amino-1-butanol). In some aspects, the PBAE molecule is capped with 1-(3-aminopropyl)-4-methylpiperazine.