Abstract
Drug resistance exhibited by cancer cells remains one of the primary reasons for the failure of therapeutic approaches to increase the survival of cancer patients. Marginal improvement in therapeutic efficacy with current treatment approaches for non-small cell lung cancer (NSCLC) mandates new treatment strategies. Tax interacting Protein-1 (TIP1) is a radiation-inducible molecular target involved in various cancer pathways. TIP1 expression correlates with poor survival in NSCLC patients. Antibody blocking the functional domain of TIP1 reduced cell proliferation and sensitized cancer cells to radiation. A ten-fold increase in Midkine (MDK) was observed in the proteomic analysis of cells treated with anti-TIP1 antibody. Wnt signaling activation led to MDK upregulation at the mRNA and protein levels following TIP1 blockade. Genetic silencing of β-catenin abrogated the induction of MDK following anti-TIP1 antibody treatment. Inhibiting TIP1 along with MDK showed a reduction in the colony-forming capability of the cells, indicating that MDK upregulation might be a strategy employed by cancer cells to combat the anti-proliferative capabilities of the anti-TIP1 antibody. Co-targeting cell surface TIP1 and MDK may be an effective therapeutic strategy for NSCLC patients.
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Acknowledgements
We thank Nathan Cheung and Kristina Dalton for their assistance in the experiments. We thank Reid R Townsend and Petra Gilmore at the Washington University Proteomics Core for quantitative proteomics analysis. We also thank the Siteman Cancer Center’s shared research facilities and the Elizabeth & James McDonnell Endowment for DH.
Funding
This study was supported by the Lung Cancer Research Foundation (Vaishali Kapoor) and K22CA234404 (Vaishali Kapoor).
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MS performed the investigation, analysis, and wrote the manuscript. HKS performed the investigation and analysis. DEH reviewed and edited the manuscript. AKS performed the investigation, analysis, wrote, and reviewed the manuscript. VK conceptualized, supervised, and provided funding for the study, performed investigation and analysis, and wrote and edited the manuscript. All the authors reviewed and approved the manuscript.
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Dr. Hallahan is a founder and shareholder of Medical Guidance Systems LLC, which is developing human anti-TIP1 antibodies. Vaishali Kapoor and Abhay Kumar Singh are inventors on pending patents. Other authors state that there are no conflicts of interest. All authors agree to send an individual conflict of interest form if requested by the journal.
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Saikia, M., Shah, H.K., Hallahan, D.E. et al. Blocking the functional domain of cancer cell surface TIP1 upregulates Midkine via the β-catenin/Wnt signaling pathway. Cancer Gene Ther 32, 785–792 (2025). https://doi.org/10.1038/s41417-025-00922-8
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DOI: https://doi.org/10.1038/s41417-025-00922-8