Abstract
Purpose
PARP inhibitors have revolutionized the treatment landscape for advanced prostate cancer (PCa) patients who harboring mutations in homologous recombination repair (HRR) genes. However, the molecular mechanisms underlying PARP inhibitors function beyond DNA damage repair pathways remain elusive, and identifying novel predictive targets that favorably respond to PARP inhibitors in PCa is an active area of research.
Methods
The expression of GSDME in PCa cell lines and human PCa samples was determined by western blotting. Targeted bisulfite sequencing, gene enrichment analysis (GSEA), clone formation, construction of the stably transfected cell lines, lactate dehydrogenase (LDH) assay, western blotting as well as a mouse model of subcutaneous xenografts were used to investigate the role of GSDME in PCa. The combinational therapeutic effect of olaparib and decitabine was determined using both in vitro and in vivo experiments.
Results
We have found low expression of GSDME in PCa. Interestingly, we demonstrated that GSDME activity is robustly induced in olaparib-treated cells undergoing pyroptosis, and that high methylation of the GSDME promoter dampens its activity in PCa cells. Intriguingly, genetically overexpressing GSDME does not inhibit tumor cell proliferation but instead confers sensitivity to olaparib. Furthermore, pharmacological treatment with the combination of olaparib and decitabine synergistically induces GSDME expression and cleavage through caspase-3 activation, thus promoting pyroptosis and enhancing anti-tumor response, ultimately resulting in tumor remission.
Conclusion
Our findings highlight a novel therapeutic strategy for enhancing the long-term response to olaparib beyond HRR-deficient tumors in PCa, underscoring the critical role of GSDME in regulating tumorigenesis.
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We appreciated the free access to TCGA, GEO, DNMIVD and EWAS Data Hub databases and GSEA software.
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This work was supported by grants from Ministry of Science and Technology (2022YFC2702703), Science and Technology Commission of Shanghai Municipality (21ZR1433100), and SJTU funding (YG2022ZD016).
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T.W. conceived and designed the experiments. T.W. and A.T. performed the experiments, acquired, and analyzed data, presented figures, and wrote manuscript of the paper. Y.Z. and J.C. performed the experiments and analyzed the data. J.S. provided the clinical-related materials. W.X. acquired fundings and supervised experiments. W.X. conceived and designed the experiments, reviewed drafts of the paper, and approved the final draft.
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Tian, A., Wu, T., Zhang, Y. et al. Triggering pyroptosis enhances the antitumor efficacy of PARP inhibitors in prostate cancer. Cell Oncol. 46, 1855–1870 (2023). https://doi.org/10.1007/s13402-023-00860-3
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DOI: https://doi.org/10.1007/s13402-023-00860-3