Liposome Delivery of Chemoselective Functional Groups for Cell Surface Engineering
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Solution Overview
Problem
Current methods for tissue engineering face challenges in controlling spatial and temporal cellular interactions and mimicking the 3D in vivo environment, with existing cell-surface engineering techniques being complex and potentially disruptive to cellular functions.
Innovation Solution
The incorporation of chemoselective and bio-orthogonal reactive functional groups, such as ketone and oxyamine, into liposomes that can fuse with cell membranes, allowing for stable and controlled adhesion and fusion, enabling the delivery of these groups to the cell surface for further manipulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If metabolic or genetic methods are used to introduce functional groups on cell surfaces, then cell surface display of functional groups is achieved, but biochemical pathways required for normal cell function are altered and not all cell lines possess the required metabolic machinery
Solution Approach 1:
The patent uses liposomes as intermediary carriers to deliver functional groups to cell surfaces. Instead of directly modifying cells through complex genetic methods, the functional groups are first incorporated into liposomes, which then fuse with cell membranes to transfer the functional groups. This intermediary approach avoids altering cellular biochemical pathways while achieving the desired cell surface display.
Solution Approach 2:
The invention separates the functional group incorporation process from cell modification. Functional groups are independently incorporated into liposomes outside the cell, then delivered to the cell surface through liposome-cell fusion. This segmentation allows functional group installation without requiring the cell to possess specific metabolic machinery or undergo complex genetic modification.
2Ease of manufacture
If protein-based tags are used to incorporate functional groups into target biomolecules, then covalent modification capability is achieved, but the tags are large and bulky and become problematic when interacting with other glycans and biomolecules on the cell surface
Solution Approach 1:
The patent employs small, transient liposome carriers instead of large, permanent protein tags. The liposomes are small vesicles that deliver functional groups to the cell surface and then can be removed or degraded. This approach provides covalent modification capability without the bulk and persistence of protein-based tags, avoiding interference with other cell surface molecules.
3Adaptability or versatility
If complex genetic and biosynthetic methods are used for cell-surface engineering, then functional group incorporation is achieved, but cellular physiology is perturbed and significant biochemical pathways or cellular functions are interfered with
Solution Approach 1:
Liposomes serve as intermediary vehicles that carry functional groups to cell surfaces without requiring direct genetic or biosynthetic intervention in the cells. The liposome-cell fusion mechanism transfers functional groups while leaving cellular physiology intact, avoiding the harmful interference associated with metabolic engineering or genetic modification methods.
Solution Approach 2:
The functional groups are pre-incorporated into liposomes before they interact with cells. This preliminary preparation of functionalized liposomes allows subsequent delivery to cell surfaces without requiring the cells to undergo complex metabolic or genetic changes, thereby preserving normal cellular functions while achieving the desired surface modification.
4Manufacturing precision
If DNA hybridization is used to form 3D aggregates of multiple cell types, then spatial arrangement of cellular interactions is controlled, but the cell-surface DNA presentation is not stable for extended time periods in cell culture or in vivo
Solution Approach 1:
The patent changes the chemical nature of cell surface modifications from transient DNA presentations to stable covalently bonded functional groups. By using chemoselective reactions that form stable covalent bonds between liposome-delivered functional groups and cell surface molecules, the invention achieves long-term stability while maintaining spatial arrangement control through the directed fusion of functionalized liposomes with specific cell types.
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 allows for the formation of stable, multi-adherent liposomes and the promotion of tissue-like structures without disrupting cellular functions, providing a simple and effective method for tissue engineering and cellular manipulation.
Implementation Method 1
the liposomes combined in this manner reacted chemoselectively to form an interfacial, covalent oxime linkage, resulting in liposome docking and adhesion
Implementation Method 2
chemical recognition occurred, producing stable oxime bonds under physiological conditions
Implementation Method 3
Liposomes can be fused to cell membranes to deliver small chemical functional groups to the cell surface
Data Source
AI summary
The present application describes compounds, compositions and methods for incorporating chemoselective and bio-orthogonal complementary functional groups into liposomes. The present application also describes various uses of these modified liposomes including for tethering the chemoselective and bio-orthogonal complementary functional groups from cell surfaces by liposome delivery toward the goal of rewiring the cell surface.