Polyampholyte Polymer Cryopreservation Reduces Toxicity
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Solution Overview
Problem
Current methods for cellular cryopreservation face challenges with ice crystallization and recrystallization after freeze-thaw cycles, leading to reduced cell viability, and existing cryoprotectants are not universally applicable across various cell types, complicating the storage and transport of frozen human cells, especially in cell-based therapies.
Innovation Solution
A cryopreserving composition comprising a macromolecular polyampholyte polymer, derived from poly(methylvinyl ether-alt-maleic anhydride), is used to preserve a wide range of biological materials, including cells and proteins, by freezing them in a specific concentration of the polymer at cryopreserving temperatures, which enhances cell survival and reduces toxicity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If organic solvents like DMSO or glycerol are used for cryopreservation, then cell survival is improved, but toxicity increases
Solution Approach 1:
The patent changes the chemical parameters of the cryoprotectant by using polyampholyte polymers with specific molecular weights (10,000-1,000,000 Da) and charge densities, replacing small molecule organic solvents. This parameter change maintains cryoprotective efficacy while reducing toxicity through the polymer's size and charge characteristics that prevent cellular uptake and metabolic disruption
Solution Approach 2:
The invention uses polyampholyte polymers that contain both positive and negative charges within the same molecular structure, creating a composite material with dual functionality. The amphoteric nature allows the polymer to interact with both ice crystals and cell membranes, providing protection while maintaining biocompatibility and reducing toxic effects
2Reliability
If ice recrystallization inhibitors are used to maintain cell survival, then cell viability is improved, but the complexity of cryoprotection increases
Solution Approach 1:
The polyampholyte polymer serves multiple functions simultaneously: it acts as an ice recrystallization inhibitor, a cryoprotectant, and a viscosity modifier. This single multi-functional material replaces the need for multiple separate additives, simplifying the cryoprotection formulation while maintaining high cell viability across different cell types
3Reliability
If different cryoprotectants are used for different cell types, then cell survival is optimized, but the logistics of cell therapies become more complex
Solution Approach 1:
The polyampholyte polymer formulation provides universal cryoprotection that works effectively across multiple cell types including red blood cells, white blood cells, platelets, and stem cells. This universality eliminates the need for cell-type-specific protocol development and simplifies logistics in cell therapy manufacturing and transfusion medicine
Solution Approach 2:
By adjusting the polymer concentration and molecular weight parameters, the same polyampholyte base material can be optimized for different cell types without changing the fundamental cryoprotectant identity. This allows a single platform material to serve multiple applications, reducing logistical complexity while maintaining optimized cell survival
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 polyampholyte polymer achieves red blood cell recovery rates exceeding 80% post-freezing, comparable to glycerol methods, and demonstrates improved cell survival and reduced toxicity across various cell types, simplifying the logistics of cell therapies and transfusion medicine by providing a universal cryoprotectant.
Implementation Method 1
One issue in the field of cellular cryopreservation is ice crystallization and recrystallization after freeze-thaw cycles; this leads to reduced viability of cells. There are a number of ways that have been developed in order to maintain cell survival: these include the use of organic solvents DMSO or glycerol, and the use of ice recrystallization inhibitors (IRIs)
Implementation Method 2
Cryopreservation is a common method for storing biological material in an inactive state over prolonged periods of time. Processes of using a macromolecular polyampholyte have now been developed which provide red blood cell recovery rates (post-freezing) of over 80%
Data Source
AI summary
The present invention relates to processes for producing compositions for the cryopreservation of biological materials, e.g. cells and proteins. The compositions comprise a polyampholyte polymer. The invention also provides certain cryopreserving compositions comprising the polyampholyte polymer.