Deciphering antigen-specific T cell navigation tactics and cancer immune evasion in co-cultures

Area of Science:

• Immunology
• Cancer Biology
• Computational Biology

Background:

• Limited infiltration of cytotoxic T cells (CTLs) into solid tumors is a major challenge in cancer immunotherapy.
• Understanding T cell motility and interaction dynamics within the tumor microenvironment is crucial for improving treatment efficacy.
• Few studies have investigated how T cell behavior evolves following co-culture with cancer cells.

Purpose of the Study:

• To systematically characterize the impact of cell interactions on T cell motility and behavior in a co-culture system.
• To identify key factors contributing to T cell accumulation on cancer cell clusters.
• To investigate the phenotypic and functional changes in cancer cells following T cell interactions.

Main Methods:

• Quantitative cell trajectory analysis to assess T cell movement patterns.
• Computational modeling to simulate and understand interaction dynamics.
• Bulk and single-cell RNA sequencing to analyze gene expression profiles of T cells and cancer cells.

Main Results:

• Cancer-specific T cells demonstrated increased directional persistence in a 2.5D co-culture system, enhancing their search for cancer cell clusters.
• Prolonged interactions between T cells and cancer cells were identified as the most critical factor for T cell accumulation on tumor clusters.
• A subset of cancer cells exhibited immunosuppressive traits post-interaction, including reduced T cell attractant expression and epithelial-to-mesenchymal transition.

Conclusions:

• Enhanced T cell directional persistence and prolonged interactions with cancer cells are key mechanisms for improving T cell infiltration in solid tumors.
• Cancer cell subpopulations can adopt immunosuppressive characteristics after T cell interaction, potentially limiting immunotherapy effectiveness.
• These findings provide critical insights for developing strategies to overcome T cell infiltration barriers and enhance cancer immunotherapy outcomes.