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Updated: May 8, 2025
Generation of Human Alloantigen-specific T Cells from Peripheral Blood
Published on: November 21, 2014
Optogenetic Clustering and Stimulation of the T Cell Receptor in Nongenetically Modified Human T Cells
Anja Armbruster1,2,3, Maximilian Hörner4,5,6, Wilfried Weber7,8,9
1INM-Leibniz Institute for New Materials, Saarbrücken, Germany.
Abstract:
Methods for the precise temporal control of cell surface receptor activation are indispensable for the investigation of signaling processes in mammalian cells. Optogenetics enables such precise control, but its application in primary cells is limited by the imperative for genetic manipulation of target cells. We here describe a method that overcomes this obstacle and enables the precise activation of the T cell receptor in nongenetically engineered human T cells by light. Our optogenetic receptor activation system OptoREACT employs a TCR-specific scFv fused to PIF6 that interacts with tetramerized PhyB in a light-dependent manner and thereby clusters and activates the T cell receptor in response to red light. OptoREACT not only omits genetic manipulation of the target cell but, because of its modular nature, is likely applicable to a broad range of oligomerization-activated cell surface receptors.
Insights
Researchers developed OptoREACT, a novel optogenetic system for precise T cell receptor activation in human cells without genetic modification. This light-inducible method offers a powerful tool for studying cell signaling and immune responses.
Area of Science:
- Immunology
- Cell Biology
- Biotechnology
Background:
- Precise temporal control of cell surface receptor activation is crucial for studying signaling pathways in mammalian cells.
- Optogenetics offers precise control but typically requires genetic manipulation, limiting its use in primary cells.
- Investigating T cell receptor (TCR) signaling in non-genetically engineered cells presents a significant challenge.
Purpose of the Study:
- To develop a method for light-inducible, precise activation of the T cell receptor (TCR) in nongenetically engineered human T cells.
- To overcome the limitations of existing optogenetic approaches in primary cell research.
- To provide a versatile tool for studying TCR signaling and immune responses.
Main Methods:
- Developed OptoREACT, an optogenetic system utilizing a TCR-specific scFv fused to PIF6.
- Engineered tetramerized PhyB to interact with PIF6 in a light-dependent manner.
- Demonstrated red light-induced clustering and activation of the TCR in human T cells without genetic modification.
Main Results:
- Successfully achieved precise, light-dependent activation of the T cell receptor (TCR) in human T cells.
- OptoREACT obviates the need for genetic manipulation of target cells.
- The modular design suggests broad applicability to other oligomerization-activated cell surface receptors.
Conclusions:
- OptoREACT provides a groundbreaking method for optogenetic control of TCR signaling in primary human T cells.
- This approach significantly expands the utility of optogenetics in studying cell surface receptor function.
- The system holds promise for advancing research in immunology and cell signaling with potential therapeutic implications.
