Multi-Domain CAR T-Cell Composition for Antigen-Independent Expansion
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Solution Overview
Problem
Existing chimeric antigen receptors (CARs) for T cells do not adequately support extensive T-cell proliferation, which is crucial for effective tumor immunotherapy.
Innovation Solution
Designing CARs with specific domains, including an antigen binding domain, hinge domain, transmembrane domain, costimulatory signaling region, and CD3 zeta signaling domain, to enhance T-cell activation, expansion, and persistence, allowing antigen-independent proliferation without exogenous cytokines or feeder cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional CAR structures are used, then T cells can be activated, but extensive T-cell proliferation is not adequately supported
Solution Approach 1:
The patent combines multiple signaling domains (CD3 zeta, CD28, and OX40) into a single CAR construct to achieve synergistic effects. This merging of signaling pathways enables both robust T-cell activation and extensive proliferation, resolving the contradiction between maintaining CAR functionality and achieving high productivity through proliferation.
Solution Approach 2:
The CAR construct is designed as a composite signaling molecule integrating extracellular antigen-binding domain, transmembrane domain, and multiple intracellular signaling domains. This composite structure combines the activating signals from different co-stimulatory molecules to enhance both activation and proliferation capabilities simultaneously.
2Productivity
If CARs are designed to enhance proliferation, then T-cell expansion increases, but persistence and activation may be compromised
Solution Approach 1:
The CAR design provides continuous signaling capability through multiple co-stimulatory domains that sustain T-cell activation and proliferation over time. The combined CD28 and OX40 signaling domains ensure continuous useful action by maintaining both acute activation signals and sustained proliferative signals, preventing exhaustion and enhancing long-term persistence.
Solution Approach 2:
The CAR construct dynamically responds to antigen stimulation by activating multiple signaling pathways that adapt to different stimulation intensities. The presence of multiple signaling domains allows the system to dynamically balance activation, proliferation, and persistence responses based on the magnitude and duration of antigen exposure.
3Reliability
If multiple signaling domains are incorporated into CAR, then T-cell function improves, but CAR complexity increases
Solution Approach 1:
The CAR construct is designed as a universal multi-functional molecule that integrates antigen recognition, signal transduction, co-stimulation, and proliferation enhancement in a single chimeric protein. This multi-functionality reduces the need for separate molecular components while achieving reliable T-cell function through the coordinated action of integrated domains.
Data Source
AI summary
The present invention provides compositions and methods for generating a genetically modified T cells comprising a chimeric antigen receptor (CAR) having an antigen binding domain, a transmembrane domain, a costimulatory signaling region, and a CD3 zeta signaling domain, wherein the T cell exhibits prolonged exponential expansion in culture that is ligand independent and independent of the addition of exogenous cytokines or feeder cells.