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Published in: Journal of Hematology & Oncology 1/2015

Open Access 01-12-2015 | Research

AntiCD3Fv fused to human interleukin-3 deletion variant redirected T cells against human acute myeloid leukemic stem cells

Authors: Dongmei Fan, Zhenzhen Li, Xiaolong Zhang, Yuqi Yang, Xiangfei Yuan, Xiuli Zhang, Ming Yang, Yizhi Zhang, Dongsheng Xiong

Published in: Journal of Hematology & Oncology | Issue 1/2015

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Abstract

Background

Leukemic stem cells (LSCs) are frequently seen as a cause of treatment failure and relapse in patients with acute myeloid leukemia (AML). Thus, successful new therapeutic strategies for the treatment of AML should aim at eradicating LSCs. The identification of targets on the cell surface of LSCs is getting more and more attention. Among these, CD123, also known as the interleukin-3 (IL3)-receptor α chain, has been identified as a potential immunotherapeutic target due to its overexpression on LSCs in AML as well as on AML blasts, rather than normal hematopoietic stem cells.

Methods

We constructed a CD123-targeted fusion protein antiCD3Fv-⊿IL3, with one binding site for T cell antigen receptor (TCRCD3) and the other for CD123, by recombinant gene-engineering technology. Cysteine residues were introduced into the V domains of the antiCD3Fv segment to enhance its stability by locking the two chains of Fv together with disulfide covalent bonds. The stability and cytotoxicity of the two fusion proteins were detected in vitro and in vivo.

Results

Both fusion proteins were produced and purified from Escherichia coli 16C9 cells with excellent yields in fully active forms. High-binding capability was observed between these two fusion proteins and human IL3R, leading to the specific lysis of CD123-expressing cell lines KG1a; also, mononuclear cells from primary AML patients were inhibited in a colony forming assay in vitro, presumably by redirecting T lymphocytes in vitro. In addition, they displayed an antileukemic activity against KG1a xenografts in non-obese diabetic/severe combined immunodeficient (NOD/SCID) mice, especially disulfide-stabilized (ds)-antiCD3Fv-⊿IL3 for its improved stability.

Conclusions

These results suggest that both fusion proteins display the antileukemic activity against CD123-expressing cell lines as well as leukemic progenitors in vitro and in vivo, especially ds-antiCD3Fv-⊿IL3. They could be the promising candidates for future immunotherapy of AML.
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Metadata
Title
AntiCD3Fv fused to human interleukin-3 deletion variant redirected T cells against human acute myeloid leukemic stem cells
Authors
Dongmei Fan
Zhenzhen Li
Xiaolong Zhang
Yuqi Yang
Xiangfei Yuan
Xiuli Zhang
Ming Yang
Yizhi Zhang
Dongsheng Xiong
Publication date
01-12-2015
Publisher
BioMed Central
Published in
Journal of Hematology & Oncology / Issue 1/2015
Electronic ISSN: 1756-8722
DOI
https://doi.org/10.1186/s13045-015-0109-5

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