膜锚定型 SLP-76 工程化 T 细胞克服 CAR-T 细胞治疗的抗原低表达耐药

Chimeric antigen receptor (CAR) T cells can mediate durable complete responses in individuals with certain hematologic malignancies, but antigen downregulation is a common mechanism of resistance. Although the native T cell receptor can respond to very low levels of antigen, engineered CARs cannot, likely due to inefficient recruitment of downstream proximal signaling molecules.

We developed a platform that endows CAR T cells with the ability to kill antigen-low cancer cells consisting of a membrane-tethered version of the cytosolic signaling adaptor molecule SLP-76 (MT-SLP-76). MT-SLP-76 can be expressed alongside any CAR to lower its activation threshold, overcoming antigen-low escape in multiple xenograft models.

Mechanistically, MT-SLP-76 amplifies CAR signaling through recruitment of ITK and PLC 1. MT-SLP-76 was designed based on biologic principles to render CAR T cell therapies less susceptible to antigen downregulation and is poised for clinical development to overcome this common mechanism of resistance.