Unlocking CAR T cell potential: Inosine-induced stemness and enhanced potency

Area of Science:

• Immunology
• Oncology
• Cell Biology

Background:

• Adenosine (Ado) is a key mediator of immune suppression within the tumor microenvironment.
• Understanding adenosine's role is crucial for developing effective cancer immunotherapies.

Purpose of the Study:

• To investigate the mechanisms of adenosine-mediated immunosuppression in tumors.
• To evaluate the impact of modulating adenosine metabolism on CAR T-cell functionality and stemness.

Main Methods:

• Overexpression of adenosine deaminase (ADA-OE) in tumor models.
• Exposure of CAR T-cells to inosine (INO).
• Assessment of CAR T-cell function, stemness features, and tumor immune suppression.

Main Results:

• Overexpression of adenosine deaminase (ADA-OE) led to the metabolism of adenosine to inosine (INO).
• Both ADA-OE and direct inosine exposure enhanced CAR T-cell functionality.
• Inosine exposure induced stemness features in CAR T-cells, improving their anti-tumor potential.

Conclusions:

• Modulating adenosine metabolism, specifically by increasing inosine levels, can overcome adenosine-driven immunosuppression.
• Enhancing CAR T-cell stemness and function through inosine presents a promising strategy for improving cancer immunotherapy outcomes.