Journal
MOLECULAR THERAPY
Volume 23, Issue 4, Pages 757-768Publisher
CELL PRESS
DOI: 10.1038/mt.2014.208
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Funding
- National Institutes of Health [P50 CA107399, P30 CA033572, P01 CA030206]
- Lymphoma Research Foundation
- Marcus Foundation
- Skirball Foundation
- Tim Lindenfelser Lymphoma Research Fund
- Tim Nesvig Lymphoma Research Foundation
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The success of adoptive therapy using chimeric antigen receptor (CAR)-expressing T cells partly depends on optimal CAR design. CARs frequently incorporate a spacer/linker region based on the constant region of either IgG1 or IgG4 to connect extracellular ligand-binding with intracellular signaling domains. Here, we evaluated the potential for the IgG4-Fc linker to result in off-target interactions with Fc gamma receptors (Fc gamma Rs). As proof-of-principle, we focused on a CD19-specific scFv-IgG4-CD28-zeta CAR and found that, in contrast to CAR-negative cells, CAR+ T cells bound soluble Fc gamma Rs in vitro and did not engraft in NSG mice. We hypothesized that mutations to avoid Fc gamma R binding would improve CAR+ T cell engraftment and antitumor efficacy. Thus, we generated CD19-specific CARs with IgG4-Fc spacers that had either been mutated at two sites (L235E; N297Q) within the CH2 region (CD19R(EQ)) or incorporated a CH2 deletion (CD19Rch2 Delta). These mutations reduced binding to soluble Fc gamma Rs without altering the ability of the CAR to mediate antigen-specific lysis. Importantly, CD19R(EQ) and CD19Rch2 Delta T cells exhibited improved persistence and more potent CD19-specific antilymphoma efficacy in NSG mice. Together, these studies suggest that optimal CAR function may require the elimination of cellular Fc gamma R interactions to improve T cell persistence and antitumor responses.
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