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Published in: BMC Medicine 1/2022

Open Access 01-12-2022 | Gastrointestinal Stromal Tumor | Research article

Efficacy of SCF drug conjugate targeting c-KIT in gastrointestinal stromal tumor

Authors: Dengyang Zhang, Chunxiao He, Yao Guo, Jianfeng Li, Bo Li, Yuming Zhao, Liuting Yu, Zhiguang Chang, Hanzhong Pei, Ming Yang, Na Li, Qi Zhang, Yulong He, Yihang Pan, Zhizhuang Joe Zhao, Changhua Zhang, Yun Chen

Published in: BMC Medicine | Issue 1/2022

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Abstract

Background

Gastrointestinal stromal tumor (GIST) is a rare type of cancer that occurs in the gastrointestinal tract. The majority of GIST cases carry oncogenic forms of KIT, the receptor for stem cell factor (SCF). Small molecule kinase inhibitor imatinib is effective in prolonging the survival of GIST patients by targeting KIT. However, drug resistance often develops during the therapeutic treatment. Here, we produced a SCF-emtansine drug conjugate (SCF-DM1) with favorable drug efficacy towards GIST cells.

Methods

Recombinant human SCF (rhSCF) was expressed in E. coli cells and further purified with Ni–NTA Sepharose and Phenyl Sepharose. It was then conjugated with DM1, and the conjugated product SCF-DM1 was evaluated using in vitro cell-based assays and in vivo xenograft mouse model.

Results

SCF-DM1 was effective in inhibiting imatinib-sensitive and -resistant GIST cell lines and primary tumor cells, with IC50 values of < 30 nM. It induced apoptosis and cell cycle arrest in GIST cells. In xenograft mouse model, SCF-DM1 showed favorable efficacy and safety profiles.

Conclusions

rhSCF is a convenient and effective vector for drug delivery to KIT positive GIST cells. SCF-DM1 is an effective drug candidate to treat imatinib-sensitive and -resistant GIST.
Appendix
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Metadata
Title
Efficacy of SCF drug conjugate targeting c-KIT in gastrointestinal stromal tumor
Authors
Dengyang Zhang
Chunxiao He
Yao Guo
Jianfeng Li
Bo Li
Yuming Zhao
Liuting Yu
Zhiguang Chang
Hanzhong Pei
Ming Yang
Na Li
Qi Zhang
Yulong He
Yihang Pan
Zhizhuang Joe Zhao
Changhua Zhang
Yun Chen
Publication date
01-12-2022
Publisher
BioMed Central
Published in
BMC Medicine / Issue 1/2022
Electronic ISSN: 1741-7015
DOI
https://doi.org/10.1186/s12916-022-02465-3

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