Cooperative CAR targeting to selectively eliminate AML and minimize escape.

ABSTRACT: Acute myeloid leukemia (AML) poses a singular challenge for chimeric antigen receptor (CAR) therapy owing to its phenotypic heterogeneity and similarity to normal hematopoietic stem/progenitor cells (HSPCs). Here we expound a CAR strategy intended to efficiently target AML while minimizing HSPC toxicity. Quantification of target expression in relapsed/refractory patient samples and normal HSPCs reveals a therapeutic window for gated co-targeting of ADGRE2 and CLEC12A: We combine an attenuated ADGRE2-CAR with a CLEC12A-chimeric costimulatory receptor (ADCLEC.syn1) to preferentially engage ADGRE2^posCLEC12A^pos leukemic stem cells over ADGRE2^lowCLEC12A^neg normal HSPCs. ADCLEC.syn1 prevents antigen escape in AML xenograft models, outperforms the ADGRE

SUBMITTER: Haubner S 

PROVIDER: S-EPMC11006543 | biostudies-literature | 2023 Nov

REPOSITORIES: biostudies-literature