Abstract
Recently, radioresistant cancer cells surviving radiotherapy have been suggested to show more aggressive phenotypes than parental cells, and the underlying mechanisms may be associated with cancer stem cells. This study provided novel mechanistic insights for E3 ubiquitin ligase CHIP in stem cell properties and radioresistance of non-small cell lung cancer (NSCLC). After bioinformatic prediction for key genes involved, NSCLC tissues and cells were collected to measure the expression of CHIP and PBK. E3 ubiquitin ligase CHIP was poorly expressed, while PBK was highly expressed in NSCLC tissues and cells. CHIP reduced the protein stability of PBK through the ubiquitin-protease pathway to repress the activation of ERK pathway. Based on the gain- or loss-of-function experiments, it was noted that restoration of CHIP curtailed stem cell properties and radioresistance in NSCLC, as manifested by inhibited sphere formation and cell proliferation, decreased number of CD133+CD44+ cells and expression of OCT4, SOX2, and NANOG, as well as facilitated apoptosis of NSCLC cells. Besides, in vivo animal experiments further confirmed that CHIP restrained tumorigenic ability and improved radiosensitivity of NSCLC cells by inhibiting PBK/ERK axis. Collectively, CHIP suppressed stem cell properties and radioresistance of NSCLC cells by inhibiting PBK/ERK axis, therefore offering a potential therapeutic target for enhancing efficacy of radiotherapy.
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Data availability
The data that supports the findings of this study are available on request from the corresponding author upon reasonable request.
Abbreviations
- NSCLC:
-
Non-small cell lung cancer
- CSCs:
-
Cancer stem cells
- PBK:
-
PDZ-binding kinase
- LNX:
-
Ligand of numb protein X
- ERK:
-
Extracellular signal-regulated kinase
- AJCC:
-
American Association of Cancer
- RPMI:
-
Roswell Park Memorial Institute
- FBS:
-
Fetal Bovine Serum
- RT-qPCR:
-
Reverse transcription quantitative polymerase chain reaction
- GAPDH:
-
Glyceraldehyde-3-phosphate dehydrogenase
- RIPA:
-
Radio Immunoprecipitation Assay
- BCA:
-
Bicinchoninic acid
- SDS-PAGE:
-
Sodium dodecyl sulfate polyacrylamide gel electrophoresis
- PVDF:
-
Polyvinylidene fluoride
- EC:
-
Enhanced chemiluminescence
- Co-IP:
-
Co-immunoprecipitation
- PBS:
-
Phosphate buffered saline
- CCK-8:
-
Cell counting kit-8
- OD:
-
Optical density
- ANOVA:
-
Analysis of variance
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BT and JZ designed the study. BT and HM collated the data, carried out data analyses and produced the initial draft of the manuscript. WW and YY contributed to drafting the manuscript. JZ contributed to revising the manuscript. All authors have read and approved the final submitted manuscript.
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The study protocol was approved by the Ethics Committee of The Affiliated Cancer Hospital of Zhengzhou University & Henan Cancer Hospital. All patients signed written informed consent before the collection of lung tissues and information. All procedures of experimental animals were in line with the Guide for the Care and Use of Laboratory Animals.
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Tan, B., Zhang, J., Wang, W. et al. Tumor-suppressive E3 ubiquitin ligase CHIP inhibits the PBK/ERK axis to repress stem cell properties and radioresistance in non-small cell lung cancer. Apoptosis 28, 397–413 (2023). https://doi.org/10.1007/s10495-022-01789-y
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DOI: https://doi.org/10.1007/s10495-022-01789-y