Electrospun Mesh Substrate for Safe Ex Vivo T Cell Expansion
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Solution Overview
Problem
Current T cell expansion platforms for adoptive immunotherapy lack the ability to fine-tune surface rigidity while maintaining a high area-to-volume ratio, which is crucial for optimal cell activation and proliferation, and pose safety concerns due to potential residual activating substrate transfer.
Innovation Solution
A polymeric microfibrous mesh composed of medical-grade poly(dimethyl siloxane) (PDMS) and poly(caprolactone) (PCL) is developed, with adjustable rigidity and porosity, which provides a safer and more effective surface for T cell expansion by leveraging mechanosensing abilities, eliminating the risk of substrate transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If rigid substrates like polystyrene plastic and glass are used for T cell activation, then high surface area-to-volume ratio is achieved, but T cell activation and proliferation are suboptimal due to unnatural stiffness
Solution Approach 1:
The patent applies parameter changes by systematically varying the Young's modulus of the substrate from rigid (polystyrene, E > 2 MPa) to soft (hydrogels and electrospun meshes, E < 100 kPa). This parameter change resolves the contradiction by demonstrating that soft substrates better mimic the in vivo microenvironment and significantly improve T cell activation, proliferation, and differentiation compared to rigid substrates, while maintaining high surface area-to-volume ratio through the mesh architecture.
Solution Approach 2:
The patent employs porous materials, specifically electrospun mesh substrates with controlled porosity (60-80%), to achieve both high surface area-to-volume ratio and appropriate mechanical softness. The porous structure provides adequate space for T cell infiltration and interaction while the soft matrix (E < 100 kPa) mimics the natural tissue environment, resolving the contradiction between structural efficiency and biological compatibility.
2Productivity
If Dynabeads are used for T cell expansion, then high surface area-to-volume ratio is achieved, but safety concerns arise due to potential residual substrate transfer to patient
Solution Approach 1:
The patent applies the disposable principle by using a non-cellular, biocompatible mesh substrate that can be easily removed and discarded after a single use. The electrospun mesh serves as a temporary support structure during ex vivo expansion but is completely eliminated before patient reinfusion, eliminating the risk of residual substrate transfer while maintaining high T cell proliferation rates during the expansion process.
Solution Approach 2:
The patent extracts the problematic cellular components from the expansion system by using a non-cellular mesh substrate instead of immune cells like Dynabeads. This extraction eliminates the risk of residual cellular material transferring to the patient while preserving the essential function of providing a high surface area-to-volume ratio support for T cell expansion.
3Productivity
If soft substrates with Young's Modulus less than 100 kPa are used, then optimal T cell activation is achieved, but manufacturing complexity increases compared to rigid substrates
Solution Approach 1:
The patent applies parameter changes by controlling the electrospinning process parameters (voltage, flow rate, collector distance, polymer concentration) to produce meshes with precisely controlled mechanical properties (E < 100 kPa) and porosity (60-80%). This systematic parameter control enables reproducible fabrication of soft substrates with optimal T cell activation properties while maintaining a relatively simple single-step electrospinning 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
The mesh substrate enhances T cell expansion and activation, achieving higher proliferation rates compared to traditional methods like Dynabeads, while ensuring safety by preventing residual substrate transfer, and maintains functional cytotoxic activity across various clinical applications.
Implementation Method 1
provides a safer and more effective surface for T cell expansion by leveraging mechanosensing abilities
Data Source
AI summary
In an aspect, compositions, methods, and devices described herein provide a safer platform for the ex vivo expansion of cells for immunotherapeutic purposes that eradicates the possibility of having activating substrate transferred into the patient while maintaining and improving upon the level of cell activation and proliferation.