Biomimetic Polymer Particles for Immune Cell Activation
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Solution Overview
Problem
Current particle platforms, such as PLGA, do not provide ideal levels of immune cell activation and expansion, limiting their practical utility for modulating immune cell activity both ex vivo and in vivo.
Innovation Solution
Biodegradable, biomimetic particles comprising a polymer blend of polyesters and polyamines, with surface ligands for cell surface receptors, are developed to enhance immune cell interaction and activation, offering higher ligand density and better mimicry of cell-to-cell interfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PLGA-only particles are used, then manufacturing simplicity is maintained, but immune cell activation efficacy is insufficient
Solution Approach 1:
The patent uses a composite polymer system consisting of PLGA blended with polyethyleneimine (PEI) or poly(beta-amino ester) (PBAE). This composite material approach combines the biodegradability and biocompatibility of PLGA with the cationic properties of PEI/PBAE that enhance cellular uptake and immune cell activation, thereby resolving the contradiction between manufacturing simplicity and activation efficacy.
Solution Approach 2:
The patent modifies the surface charge parameter of the particles by incorporating cationic polymers (PEI/PBAE) into the PLGA matrix. This parameter change from neutral to positive surface charge significantly enhances interaction with negatively charged cell membranes and improves immune cell activation, while maintaining a relatively simple two-component polymer system.
2Reliability
If ligand density is increased to enhance immune cell activation, then activation efficacy improves, but particle manufacturing complexity increases
Solution Approach 1:
The patent creates local high-density ligand clusters on the particle surface by utilizing the cationic polymer's ability to concentrate negatively charged ligands (such as antibodies or ligands with carboxyl groups) through electrostatic interactions. This local quality enhancement allows high ligand density in specific regions without requiring uniform distribution throughout the entire particle, simplifying the manufacturing process.
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
These particles stimulate immune cells at significantly lower doses than PLGA-only platforms, achieving robust immune cell activation and expansion both in vitro and in vivo, with the potential to treat cancers and infectious diseases by targeting specific cell surface markers and immune checkpoint molecules.
Implementation Method 1
Biodegradable, biomimetic particles comprising a polymer blend of polyesters and polyamines
Data Source
AI summary
The present invention provides biodegradable, biomimetic particles for interacting with cells, including immune cells. In various embodiments, the particles comprise a polymer blend comprising a polyester, such as poly(lactic-co-glycolic acid) (PLGA) and a polyamine, such as poly(beta-amino ester) (PBAE). The particles further comprise, on their surface, one or more ligands for one or more cell surface receptor(s) or cell surface molecule(s). In some embodiments, the cell surface receptor or cell surface molecule is on an immune cell, such as a lymphocyte (T cell or B cell), natural killer cell, dendritic cell, or other cell of the immune system or tumor microenvironment.