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TRIM32 promotes anoikis resistance and metastasis in NSCLC by degrading CHEK2 to enhance IL-6 secretion

Abstract

Metastasis significantly contributes to the high mortality of non-small cell lung cancer (NSCLC), with anoikis resistance playing a critical role in this process. However, the role of TRIM32 in anoikis resistance and metastasis is not well understood. In this study, we demonstrate that TRIM32 enhances both anoikis resistance and metastasis in NSCLC. We confirmed the interaction between TRIM32 and CHEK2, and showed that TRIM32 mediates the degradation of CHEK2 via K48-linked polyubiquitination. Our results indicate that CHEK2 suppresses anoikis resistance and metastasis in NSCLC, both in vitro and in vivo. Additionally, we found that TRIM32 upregulates IL-6 expression, an effect that is reversed by the overexpression of CHEK2. Further analysis confirmed that IL-6 plays a key role in TRIM32-mediated anoikis resistance and metastasis. Notably, TRIM32+CHEK2-IL-6+ tumor cells were more prevalent in NSCLC tissues with lymph node metastasis. In conclusion, our findings suggest that targeting TRIM32 to inhibit anoikis resistance and metastasis, via the CHEK2/IL-6 axis, may provide a novel therapeutic strategy for treating metastatic NSCLC.

The mechanisms by which TRIM32 promotes anoikis resistance and metastasis in NSCLC. Schematic diagram showing the regulatory mechanisms of TRIM32 promotes anoikis resistance and metastasis in NSCLC by degrading CHEK2 to promote IL-6 secretion.

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Fig. 1: TRIM32 is highly expressed in NSCLC and is highly expressed in anoikis resistant cells.
Fig. 2: Overexpression of TRIM32 promotes anoikis resistance and metastasis in NSCLC.
Fig. 3: Knockout of TRIM32 inhibits anoikis resistance and metastasis in NSCLC.
Fig. 4: TRIM32 degrades CHEK2 through ubiquitination of the K-48 polyubiquitin chain.
Fig. 5: CHEK2 inhibits anoikis resistance and metastasis in NSCLC.
Fig. 6: TRIM32 promotes anoikis resistance and metastasis in NSCLC through CHEK2.
Fig. 7: TRIM32 regulates anoikis resistance and metastasis of NSCLC through IL-6.
Fig. 8: TRIM32+CHEK2-IL-6+ subpopulation of NSCLC cells and metastasis in NSCLC show positive correlation.

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All data generated or analyzed during this study are included in this published article.

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Acknowledgements

We sincerely thank Prof. Dongming Kuang from Sun Yat-sen University for his invaluable guidance and support, which were instrumental in the successful completion of this research. His insightful suggestions and expertise provided critical contributions to the study’s direction and outcomes. We also appreciate the assistance and constructive feedback from our colleagues and collaborators, which significantly enhanced the quality of this work.

Funding

This research was funded by Key Project of Jiangsu Provincial Health Commission (zd2021050), State-level Key Laboratory of Clinical Immunology (Soochow University) (9012280224), Su Zhou Basic Research Pilot Project (SSD2024098), Suzhou Applied Basic research (SKY2022128), National Natural Science Foundation of China (82303146,81872328,81372276,30901789), 2024 Reserve Talent Program (0499980201048, 0302020201048).

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Contributions

Jia Xu, Conceptualisation, Validation, Data Management, Formal Analysis, Writing Originals, Visualisation. Wenjun Liu, Conceptualisation, Formal Analysis, Data Management, Validation. Li Chen, Conceptualisation, Software. Juan Zhang, Software, Investigation. Dongze Zhang, Conceptualisation, Investigation. Xue Huang, Funding Acquisition, Methodology, Project Management, Writing-Review and Editing, Supervision. Guangbo Zhang, Funding Acquisition, Methodology, Project Management, Writing-Review and Editing, Resources.

Corresponding authors

Correspondence to Xue Huang or Guangbo Zhang.

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All animal experiments were conducted according to the guidelines of the First Affiliated Hospital of Soochow University and approved by the Laboratory Animal Ethics Committee of Soochow University. The present study was approved by the Bioscience Ethics Review Committee of Hunan Aifang Biotechnology Co., Ltd., and all enrolled patients provided written informed consent.

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Xu, J., Liu, W., Chen, L. et al. TRIM32 promotes anoikis resistance and metastasis in NSCLC by degrading CHEK2 to enhance IL-6 secretion. Cell Death Differ (2025). https://doi.org/10.1038/s41418-025-01559-8

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