Cationic Hydrogel Nanoparticles for Membrane Permeabilization
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Solution Overview
Problem
Current intracellular delivery methods for membrane-impermeable molecules face challenges such as inefficient cargo decomplexation, endosomal escape, and cell viability issues, particularly in ex vivo applications where high-throughput and cost-effective techniques are needed for diverse cell types.
Innovation Solution
The use of supramolecular cationic materials, specifically crosslinked cationic hydrogel nanoparticles like dextran nanogels, which disrupt cell membranes to enable direct cytosolic delivery without interacting with the cargo, allowing for passive transport across the cell membrane.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If carrier-based delivery using non-viral nanocarriers is used, then cargo protection from degradation and scalability are improved, but cargo encapsulation is limited by physicochemical properties and endosomal escape remains inefficient
Solution Approach 1:
The invention extracts the membrane disruption function from the carrier system, using cationic polymers solely as membrane permeabilizing agents rather than as cargo carriers. This separates the membrane interaction function from the cargo delivery function, allowing any membrane-impermeable cargo to be delivered directly through polymer-induced pores without requiring cargo-specific carrier optimization.
Solution Approach 2:
The cationic polymer formulation serves multiple functions: it permeabilizes the membrane, enables direct cytosolic delivery, and can be applied to diverse cell types without requiring cell-specific optimization. This universal approach replaces the need for cargo-specific carrier design and endosomal escape mechanisms.
2Productivity
If membrane disruption-mediated delivery is used, then flexibility and delivery efficiency are improved, but cell viability is reduced due to membrane defects and cellular stress responses
Solution Approach 1:
The invention optimizes the concentration and properties of cationic polymers to achieve membrane permeabilization at sub-toxic levels. By carefully controlling polymer concentration and using crosslinked formulations, the system achieves efficient delivery while minimizing membrane damage and cellular stress responses that would compromise viability.
Solution Approach 2:
The cationic polymer acts as a temporary, disposable permeabilizing agent that facilitates delivery and then dissipates, unlike viral vectors that require complex life cycle management. The polymer-induced membrane pores close after cargo delivery, restoring membrane integrity without leaving persistent damage.
3Productivity
If ex vivo cell engineering is performed for extended periods, then delivery completeness is improved, but cell viability deteriorates due to culture time-related stress
Solution Approach 1:
The membrane permeabilization and cargo delivery are performed as a rapid preliminary action before extended culture periods begin. The cationic polymer induces immediate membrane pore formation, allowing cargo entry within minutes, thereby completing delivery before time-related viability issues can develop during subsequent culture.
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
This approach achieves high efficiency in delivering a wide range of molecules, including large cargo, with minimal cell damage and extended incubation times, bypassing the need for external triggers and endocytic pathways, thus improving delivery efficacy and cell viability.
Implementation Method 1
The cell membrane is composed of phospholipids with negatively charged phosphate groups. Cationic materials interact electrostatically with these negative charges, disrupting membrane structure and forming transient pores that enable passive transport of cargo molecules into the cell cytosol without requiring endocytic pathways.
Implementation Method 2
Studies using supported lipid bilayers as model membranes revealed that localized membrane thinning events typically precede the complete removal of lipids, eventually resulting in membrane pores with an estimated average size of 15-40 nm in diameter. This pore formation enables passage of membrane-impermeable molecules into the cytosol.
Data Source
AI summary
The present invention is related to the field of intracellular delivery of membrane-impermeable materials. It provides compositions enabling the delivery of such membrane-impermeable materials into cells, applicable for both in vitro, in vivo and ex vivo delivery applications, as well as the use thereof in methods of cytosolic delivery of membrane-impermeable materials. The compositions and methods are particularly useful in biological research, diagnostic methods and the development of cell-based therapies.