FcεRγI promotes canine CD8 chimeric antigen receptor T cell cytotoxicity through a Syk-NF-κB axis.

ABSTRACT: Comparative oncology has advanced cancer immunotherapy, although cellular mechanisms governing chimeric antigen receptor T cell (CART) therapy in canines are poorly understood. In a first-in-canine trial, anti-CD20 CART with canine 4-1BB-CD3ζ (cBBζ) domains induced CD20-negative lymphoma outgrowth but did not persist or deplete B cells. Here we show that canine CARTs incorporating human BBζ (hBBζ) demonstrate superior therapeutic function, mediated by FcεRγI. hBBζ-CART showed greater cytolysis and CD8 T cell outgrowth than cBBζ-CART in repetitive killing assays and a canine B cell leukemia xenograft model. Transcriptional profiling revealed upregulation of FCER1G and innate-like genes in CD8 hBBζ versus cBBζ-CARTs. CRISPR-mediated FCER1G deletion and pharmacologic Syk/NF-κB inhibition indi

SUBMITTER: Goodman EE 

PROVIDER: S-EPMC12857633 | biostudies-literature | 2025 Dec

REPOSITORIES: biostudies-literature