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Targeting FLT3 in Acute Myeloid Leukemia Using Ligand-Based Chimeric Antigen Receptor-Engineered T Cells

Targeting FLT3 in Acute Myeloid Leukemia Using Ligand-Based Chimeric Antigen Receptor-Engineered T Cells

Ying Wang, Yingxi Xu, Saisai Li, Jia Liu, Yanyan Xing, Haiyan Xing, Zheng Tian, Kejing Tang, Qing Rao, Min Wang, Jianxiang Wang

J Hematol Oncol. 2018 May 2;11(1):60.

PMID: 29716633

Abstract:

Background:
Chimeric antigen receptor-engineered T (CAR-T) cells have extraordinary effect in treating lymphoblastic leukemia. However, treatment of acute myeloid leukemia (AML) using CAR-T cells remains limited to date. Leukemogenesis always relates with the abnormalities of cytogenetics, and nearly one third of AML patients have activating mutations in Fms-like tyrosine kinase 3 (FLT3) which reminded poor prognosis. Considering the FLT3 expressed in AML patients' blast cells, it may be a new candidate target for CAR-T therapy to treat FLT3+ AML, especially patients harboring FLT3-ITD mutation.
Methods:
The FLT3L CAR-T using FLT3 ligand as recognizing domain was constructed. The specific cytotoxicity against FLT3+ leukemia cell lines, primary AML cells, and normal hematopoietic progenitor stem cells (HPSCs) in vitro were evaluated. In addition, FLT3+ AML mouse model was used to assess the effect of FLT3L CAR-T therapy in vivo.
Results:
FLT3L CAR-T cells could specifically kill FLT3+ leukemia cell lines and AML patients' bone marrow mononuclear cells in vitro (with or without FLT3 mutation) and have more potent cytotoxicity to FLT3-ITD cells. In a human FLT3+ AML xenograft mouse model, FLT3L CAR-T cells could significantly prolong the survival of mice. Furthermore, it was found that FLT3L CAR-T cells could activate the FLT3/ERK signaling pathway of FLT3+ leukemia cells with wild-type FLT3; meanwhile, it had no inhibitory effects on the colony formation of CD34+ stem cells derived from normal human umbilical cord blood.
Conclusions:
The ligand-based FLT3L CAR-T cells could be a promising strategy for FLT3+ AML treatment, especially those carried FLT3 mutation.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
IAR4248805	flt3-Ligand from mouse			Price

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