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Targeting the WEE1 kinase strengthens the antitumor activity of imatinib via promoting KIT autophagic degradation in gastrointestinal stromal tumors

  • Weizhen Liu
  • Xiangyu Zeng
  • Yuping Yin
  • Chengguo Li
  • Wenchang Yang
  • Wenze Wan
  • Liang Shi
  • Guobin Wang
  • Kaixiong Tao
  • Peng ZhangEmail author
Original Article
  • 123 Downloads

Abstract

Background

Activating mutation of KIT or PDGFRA is the primary molecular mechanism for gastrointestinal stromal tumors (GISTs). Although imatinib has a revolutionary effect on GIST therapeutics, the benefits are not durable. Increasing reports have demonstrated that cell cycle checkpoint plays critical roles in GIST. Here, we explore the role of WEE1 kinase in GIST progression.

Methods

Oncomine public database, western blotting, and immunohistochemistry were used to analyze WEE1 expression in GISTs. Using MTT assays, colony formation analysis, and flow cytometry, we examined the role of WEE1 in GIST cells and the antitumor activity of the inhibitor MK1775 alone, or in combination with imatinib. Cycloheximide chase assay and pharmacological inhibition of autophagy and proteasome pathway were performed to analyze KIT expression. Additionally, autophagic markers Beclin1 and LC3B were detected by western blotting.

Results

Upregulated WEE1 expression was observed in GIST tissues and correlated with tumor size, mitotic count, and risk grade. Inhibition of WEE1 significantly suppressed GIST cell proliferation, induced apoptosis and cell cycle arrest. Imatinib and MK1775 co-treatment markedly enhanced the antitumor activity. Targeting WEE1 decreased the expression of KIT expression. Moreover, WEE1 stabilized KIT protein and KIT reduction observed upon WEE1 inhibition could be reversed by pharmacological inhibition of autophagy, but not proteasome pathway. WEE1 inhibition also increased Beclin1 expression and LC3B II/I ratio in GIST cells.

Conclusions

Our data suggest that WEE1 plays a pivotal role in GIST proliferation. WEE1 inhibition could promote KIT autophagic degradation and, therefore, targeting WEE1 might represent a novel strategy for GIST therapies.

Keywords

Gastrointestinal stromal tumors WEE1 MK1775 Antitumor Autophagic degradation 

Notes

Acknowledgements

This study was supported by the National Key Basic Research Program of China (2015CB5540007), the National Science and Technology Major Project (2017YFC0113503), the National Natural Science Foundation of China (No. 81572413, 81702386, and 81874184), the Foundation of Independent Innovation Fund of Huazhong University of Science and Technology (2017KFYXJJ230 and 2017KFYXJJ256), and the Natural Science Foundation of Hubei Province (2016CFA100).

Compliance with ethical standards

Conflict of interest

The authors declare no conflict of interest.

Supplementary material

10120_2019_977_MOESM1_ESM.docx (331 kb)
Supplementary file1 (DOCX 330 kb)

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Copyright information

© The International Gastric Cancer Association and The Japanese Gastric Cancer Association 2019

Authors and Affiliations

  • Weizhen Liu
    • 1
  • Xiangyu Zeng
    • 1
  • Yuping Yin
    • 1
  • Chengguo Li
    • 1
  • Wenchang Yang
    • 1
  • Wenze Wan
    • 1
  • Liang Shi
    • 1
  • Guobin Wang
    • 1
  • Kaixiong Tao
    • 1
  • Peng Zhang
    • 1
    Email author
  1. 1.Department of Gastrointestinal Surgery, Union Hospital, Tongji Medical CollegeHuazhong University of Science and TechnologyWuhanChina

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