Probiotic-guided CAR-T cells for solid tumor targeting
Rosa L. Vincent, Candice R. Gurbatri, Fangda Li, Ana Vardoshvili, Courtney Coker, Jongwon Im, Edward R. Ballister, Mathieu Rouanne, Thomas Savage, Kenia de los Santos-Alexis, Andrew Redenti, Leonie Brockmann, Meghna Komaranchath, Nicholas Arpaia, Tal Danino
Abstract
A major challenge facing tumor-antigen targeting therapies such as chimeric antigen receptor (CAR)-T cells is the identification of suitable targets that are specifically and uniformly expressed on heterogeneous solid tumors. By contrast, certain species of bacteria selectively colonize immune-privileged tumor cores and can be engineered as antigen-independent platforms for therapeutic delivery. To bridge these approaches, we developed a platform of probiotic-guided CAR-T cells (ProCARs), in which tumor-colonizing probiotics release synthetic targets that label tumor tissue for CAR-mediated lysis in situ. This system demonstrated CAR-T cell activation and antigen-agnostic cell lysis that was safe and effective in multiple xenograft and syngeneic models of human and mouse cancers. We further engineered multifunctional probiotics that co-release chemokines to enhance CAR-T cell recruitment and therapeutic response.