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CAR-T Cell Therapy Research · Journal article
The Journal of Immunology · July 28, 2026
Early or partial results. Treat as a signal, not a conclusion.
This is a mechanistic, single-cohort study that correlates TCR 2D biophysical properties (affinity, on/off-rate, CD8 synergy) with clonal expansion and differentiation phenotypes in SARS-CoV-2–specific CD8+ T cells. The work identifies CD8 synergy as a composite metric that better predicts functional potency than affinity alone, but is descriptive and hypothesis-generating rather than confirmatory or predictive.
Single-cohort observational study with mechanistic measurements and correlation analysis. Donors with SARS-CoV-2 vaccination or infection history; antigen-specific CD8+ T cells from peripheral blood.. Intervention: TCR cloning and 2D kinetic measurement; no intervention in the usual sense..
SARS-CoV-2–specific TCRs exhibited wide 2D affinity and CD8 dependency ranges, indicating diverse activation mechanisms Expansion and differentiation correlate with combined metrics of affinity, stability, and co-receptor cooperation Highly expanded clones were not always the strongest binders; normalized CD8 synergy identified low-affinity yet functionally potent clones
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Single-cohort mechanistic study linking TCR biophysics to clonal outcomes in SARS-CoV-2 responses, with no randomization or comparator group; findings are descriptive and correlational rather than causal or predictive.
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Abstract Introduction T cell receptor (TCR) functional potency is determined by membrane-proximal, two-dimensional (2D) kinetics–on-rate, off-rate, and 2D affinity–which correlate more closely with cellular responses than conventional 3D measures. The CD8 co-receptor enhances bond number and lifetime, and normalized synergy quantifies its contribution across affinity ranges. However, how individual TCR biophysical traits relate to in vivo clonal outcomes–expansion and differentiation (naïve, TCM, TEM, cytotoxic)–remains unclear in human pathogen-specific repertoires. We aim to connect quantitative 2D biophysics with single-cell phenotypes in a SARS-CoV-2 cohort to identify features predicting robust expansion and defined differentiation. Methods SARS-CoV-2 vaccine and infection—annotated donors were analyzed. Antigen-specific CD8+ T cells were identified by peptide—MHC tetramers and single-cell sequencing to recover paired TCRα/β and transcriptomic profiles. Selected TCRs were cloned into Jurkat-76 (J76) derivatives expressing or lacking CD8, including Nur77/NFAT reporter lines, to assess co-receptor dependence. 2D kinetic parameters were measured using micropipette adhesion and bio-membrane force microscopy. Single-cell phenotypes were clustered (Seurat/totalVI), linked to clonotypes, and analyzed for correlations between biophysical features, expansion, and differentiation. Results SARS-CoV-2—specific TCRs exhibited wide 2D affinity and CD8 dependency ranges, indicating diverse activation mechanisms. Integrating biophysical and single-cell data revealed that expansion and differentiation correlate with combined metrics of affinity, stability, and co-receptor cooperation. Highly expanded clones were not always the strongest binders; rather, normalized CD8 synergy identified low-affinity yet functionally potent clones. Conclusion These insights suggest that composite biophysical signatures, not affinity alone, govern clonal fate and may inform TCR-based immunotherapies and vaccine design for durable protection. Funding Source n/a Topic Categories Viral Immunology (VIR)
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