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SING: a novel strategy for identifying tumor-specific, CTL-recognized tumor antigens
Tong Zhang1, Xianghui He, Tom C Tsang
1Gene Therapy Group, Department of Microbiology and Immunology, University of Arizona, Tucson, Arizona 85721, USA.
Summary
A new SING system simplifies identifying tumor antigens recognized by T cells. This method uses engineered cells to detect antigen peptides, enabling faster cloning of tumor antigens for cancer research.
Area of Science:
- Immunology
- Molecular Biology
- Cancer Research
Background:
- Identifying T cell-recognized tumor antigens is crucial for cancer immunotherapy but traditionally laborious.
- Existing methods for tumor antigen discovery are time-consuming and complex.
- A simplified, direct approach is needed to accelerate the identification of tumor antigens.
Purpose of the Study:
- To establish and validate a novel strategy, SING (SIgnal transduction molecule-mediated, NFAT-controlled, GFP expression), for direct cloning of T cell-recognized tumor antigens.
- To develop an engineered cell line capable of detecting antigen peptides and facilitating tumor antigen discovery.
- To demonstrate the efficiency of the SING system in identifying antigen-expressing cells.
Main Methods:
- Engineered a mouse T cell line (BW5147) with a chimeric H-2Kb construct, incorporating T cell-signaling domains and a green fluorescent protein (GFP) reporter gene controlled by NFAT.
- The modified cells, termed BS cells, were designed to become GFP+ upon TCR stimulation by antigen peptides.
- BS cells were co-cultured with antigen-specific T cells and tested for fluorescence in response to varying peptide concentrations and endogenous antigen expression.
Main Results:
- The developed BS cell line successfully detected T cell receptor (TCR) stimulation and became GFP+ in the presence of antigen peptides at concentrations as low as 10(-9) M.
- Co-culture with antigen-specific T cells induced fluorescence in BS cells, indicating successful antigen recognition.
- The SING system demonstrated proof of principle for isolating antigen-expressing BS cells from repertoires transduced with tumor-derived cDNA libraries.
Conclusions:
- The SING system offers a direct and simplified approach for cloning T cell-recognized tumor antigens.
- This novel strategy significantly reduces the time and labor associated with traditional tumor antigen identification methods.
- The SING system holds promise for advancing cancer immunotherapy research by facilitating rapid antigen discovery.