Dissecting the role of CAR signaling architectures on T cell activation and persistence using pooled screens and...

Area of Science:

• Immunology
• Oncology
• Biotechnology

Background:

• Chimeric antigen receptor (CAR) T cell therapy shows promise for cancer treatment.
• Limited T cell persistence remains a significant challenge impacting CAR T cell efficacy.
• The CAR signaling architecture critically influences T cell function and response.

Purpose of the Study:

• To systematically investigate how modifying CAR signaling domains impacts T cell activation and persistence.
• To identify key signaling components that enhance CAR T cell function for improved cancer therapy.

Main Methods:

• Designed a combinatorial CAR signaling domain library.
• Utilized repeated antigen stimulation assays, pooled screens, and single-cell sequencing.
• Correlated in vitro CAR T cell phenotypes with clinical outcomes in patients.

Main Results:

• Identified membrane-proximal domains as predominant drivers of T cell phenotype.
• Demonstrated that CD40 costimulation is crucial for robust and lasting T cell responses.
• Established a link between engineered CAR T cell phenotypes and clinical efficacy.

Conclusions:

• CAR signaling domain modifications significantly influence T cell activation and persistence.
• CD40 costimulation is a vital component for enhancing CAR T cell therapy effectiveness.
• This research provides a foundation for clinically informed CAR engineering strategies.