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Feng, Zijie; He, Xin; Zhang, Xuyao; Wu, Yuan; Xing, Bowen; Knowles, Alison; Shan, Qiaonan; Miller, Samuel; Hojnacki, Taylor; Ma, Jian; Katona, Bryson W; Gade, Terence P F; Siegel, Don L; Schrader, Jörg; Metz, David C; June, Carl H; Hua, Xianxin
Nature cancer, 05/2022, Volume: 3, Issue: 5Journal Article
Gastrointestinal cancers (GICs) and neuroendocrine tumors (NETs) are often refractory to therapy after metastasis. Adoptive cell therapy using chimeric antigen receptor (CAR) T cells, though remarkably efficacious for treating leukemia, is yet to be developed for solid tumors such as GICs and NETs. Here we isolated a llama-derived nanobody, VHH1, and found that it bound cell surface adhesion protein CDH17 upregulated in GICs and NETs. VHH1-CAR T cells (CDH17CARTs) killed both human and mouse tumor cells in a CDH17-dependent manner. CDH17CARTs eradicated CDH17-expressing NETs and gastric, pancreatic and colorectal cancers in either tumor xenograft or autochthonous mouse models. Notably, CDH17CARTs do not attack normal intestinal epithelial cells, which also express CDH17, to cause toxicity, likely because CDH17 is localized only at the tight junction between normal intestinal epithelial cells. Thus, CDH17 represents a class of previously unappreciated tumor-associated antigens that is 'masked' in healthy tissues from attack by CAR T cells for developing safer cancer immunotherapy.
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