Regulatory T Cell Expansion While Preserving Suppressive Function
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Solution Overview
Problem
Existing methods struggle to efficiently produce regulatory T cells with high proliferation while maintaining their suppressive function, particularly from pluripotent stem cells.
Innovation Solution
Culturing CD4+ T cells derived from pluripotent stem cells in the presence of IL-4 and a TGF-βR agonist, optionally with IL-3, IL-33, IL-2, a TNFR2 agonist, an mTOR inhibitor, and CDK8/19 inhibitors, to promote regulatory T cell proliferation and maintain suppressive function.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If regulatory T cells are cultured to proliferate, then the quantity of regulatory T cells increases, but the suppressive function is lost
Solution Approach 1:
The patent applies parameter changes by optimizing cytokine concentrations and culture conditions to maintain FOXP3 expression during proliferation. Specifically, using IL-4 at 10-100 ng/mL and TGF-β at 1-10 ng/mL creates an environment that supports both cell expansion and functional maintenance through controlled parameter adjustment.
Solution Approach 2:
The patent uses a composite cytokine environment combining multiple factors (IL-4, TGF-β, and optionally IL-3) to achieve simultaneous proliferation and functional maintenance. This composite approach creates synergistic effects that neither cytokine could achieve alone, preserving suppressive function while enabling expansion.
2Reliability
If FOXP3 expression is maintained in primary Tregs, then suppressive function is preserved, but proliferation efficiency decreases
Solution Approach 1:
The patent changes cultural parameters by introducing IL-4 in combination with TGF-β, which creates conditions where FOXP3 expression is maintained without suppressing proliferation. This parameter modification resolves the traditional trade-off between functional maintenance and expansion efficiency.
Solution Approach 2:
The patent uses IL-4 as an intermediary cytokine that mediates between the opposing requirements of FOXP3 maintenance and proliferation. IL-4 works synergistically with TGF-β to create a balanced environment that supports both goals simultaneously.
3Quantity of substance
If IL-4 is added to promote Treg differentiation, then FOXP3 expression may be induced, but FOXP3 expression in mouse Tregs is suppressed
Solution Approach 1:
The patent merges IL-4 with TGF-β to create a combined cytokine environment that overcomes the suppressive effect of IL-4 alone on FOXP3. The combination produces synergistic effects where TGF-β counterbalances IL-4's suppressive action while both cytokines together promote stable FOXP3 expression and Treg differentiation.
Data Source
AI summary
Disclosed are a method for producing a cell population in which regulatory T cells have proliferated, including (1) culturing a cell population containing CD4+ T cells derived from pluripotent stem cells in the presence of IL-4 and a TGF-βR agonist, a cell population containing regulatory T cells obtained according to the method, and a medicine containing the cell population containing regulatory T cells.