Regulatory T Cell Expansion at 33°C for Stable FoxP3 Expression
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Solution Overview
Problem
Existing methods for in vitro expansion of regulatory T cells (Tregs) face challenges in maintaining high FoxP3 expression and suppressor activity over time, leading to reduced efficacy in clinical therapies due to low proliferative potential and increased production of proinflammatory cytokines.
Innovation Solution
Culturing Tregs at a temperature below 37°C, specifically at 33°C, to maintain high FoxP3 expression and prevent TSDR methylation, resulting in a several-fold increase in Treg numbers with stable suppressor activity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If Tregs are cultured at standard temperature (37°C) to achieve extensive proliferation, then the number of Tregs increases, but FoxP3 expression significantly declines and suppressor activity is lost
Solution Approach 1:
The patent applies parameter changes by culturing Tregs at a reduced temperature of 33°C instead of the standard 37°C. This temperature modification creates an optimal balance that allows extensive Treg proliferation while maintaining stable and high FoxP3 expression levels throughout the culture period, thereby preserving suppressor activity
2Productivity
If Tregs are cultured at 37°C to maximize proliferation speed, then the culture duration is shortened, but TSDR methylation increases and suppressor activity decreases
Solution Approach 1:
The patent implements parameter changes by reducing the culture temperature to 33°C, which slows the proliferation rate just enough to prevent TSDR methylation while still achieving substantial Treg expansion within a clinically relevant timeframe
3Quantity of substance
If Tregs are extensively proliferated in vitro, then the therapeutic dose is sufficient, but the cells lose their characteristic Treg phenotype and acquire proinflammatory properties
Solution Approach 1:
The patent uses parameter changes (culturing at 33°C) to enable extensive Treg proliferation while maintaining phenotype stability. This temperature optimization ensures that even after multiple passages and extensive expansion, Tregs retain their characteristic regulatory phenotype and suppressor activity without acquiring proinflammatory properties
Data Source
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AI summary
The invention relates to a new method for in vitro expansion of CD4+CD25HighCD127- /lowFoxP3+ Tregs, wherein: - The process of Treg expansion takes place permanently or temporarily at a temperature below 37°C, optimally at a temperature of 33°C. - The isolated Tregs are expanded in SCGM or X-vivo-20 medium supplemented with human serum or with foetal bovine serum. - Magnetic beads coated with anti-CD3 and anti-CD28 antibodies at 1:1 [cell: bead) ratio and interleukin-2 are added to the culture.