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Updated: Jun 14, 2025
Generating De Novo Antigen-specific Human T Cell Receptors by Retroviral Transduction of Centric Hemichain
Published on: October 25, 2016
TCR/CD3-based synthetic antigen receptors (TCC) convey superior antigen sensitivity combined with high fidelity of
Vanessa Mühlgrabner1, Timo Peters1, Rubí M-H Velasco Cárdenas2,3,4
1Medical University of Vienna, Center for Pathophysiology, Infectiology and Immunology, Institute for Hygiene and Applied Immunology, Vienna, Austria.
Abstract:
Low antigen sensitivity and a gradual loss of effector functions limit the clinical applicability of chimeric antigen receptor (CAR)-modified T cells and call for alternative antigen receptor designs for effective T cell-based cancer immunotherapy. Here, we applied advanced microscopy to demonstrate that TCR/CD3-based synthetic constructs (TCC) outperform second-generation CAR formats with regard to conveyed antigen sensitivities by up to a thousandfold. TCC-based antigen recognition occurred without adverse nonspecific signaling, which is typically observed in CAR-T cells, and did not depend-unlike sensitized peptide/MHC detection by conventional T cells-on CD4 or CD8 coreceptor engagement. TCC-endowed signaling properties may prove critical when targeting antigens in low abundance and aiming for a durable anticancer response.
Insights
New T cell constructs (TCC) show significantly higher antigen sensitivity than chimeric antigen receptor (CAR)-T cells for cancer immunotherapy. This improved design offers potential for more effective and durable cancer treatments.
Area of Science:
- Immunology
- Cancer Research
- Biotechnology
Background:
- Chimeric antigen receptor (CAR)-T cell therapy faces limitations due to low antigen sensitivity and functional decline.
- Effective T cell-based cancer immunotherapy requires novel antigen receptor designs.
Purpose of the Study:
- To evaluate T cell receptor/CD3 (TCC) synthetic constructs as an alternative to CARs for cancer immunotherapy.
- To compare the antigen sensitivity and signaling properties of TCC and CAR formats.
Main Methods:
- Utilized advanced microscopy techniques.
- Compared the performance of TCC and second-generation CAR formats in antigen recognition and signaling.
Main Results:
- TCC demonstrated up to a thousandfold higher antigen sensitivity compared to CAR formats.
- TCC-mediated antigen recognition occurred without the nonspecific signaling often seen with CAR-T cells.
- TCC signaling did not require CD4 or CD8 coreceptor engagement, unlike conventional T cell recognition.
Conclusions:
- TCR/CD3-based synthetic constructs (TCC) offer superior antigen sensitivity and signaling properties over CARs.
- TCC's unique signaling may be crucial for targeting low-abundance antigens and achieving durable anticancer responses.
- TCC represents a promising advancement in T cell-based cancer immunotherapy.
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