ArticleJournal of nanobiotechnology2026
Unlocking caspase-8 enables Pt(IV) to trigger robust caspase-3/GSDME-mediated pyroptosis via drug co-delivery in chemoresistant bladder cancer.
Article in Journal of nanobiotechnology, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Overcoming profoundly suppressed programmed cell death and an immunosuppressive tumor microenvironment (TME) remains a formidable challenge in gemcitabine-cisplatin-resistant muscle-invasive bladder cancer (GP-R MIBC). To address this, we developed a glutathione (GSH)-responsive nanosystem for co-delivering the cathepsin H (CTSH) inhibitor prodrug E64d and a cisplatin prodrug Pt(IV), implementing a spatiotemporally coordinated "unlock-and-trigger" strategy. Mechanistically, the activated E64 irreversibly inhibits CTSH, thereby unlocking the TNFα-caspase-8 axis to reinstate GSDMD-mediated pyroptosis. Concurrently, caspase-8 dually activates caspase-3 via both direct cleavage and the Bid-mediated mitochondrial pathway. This primed state ensures that the DNA damage induced by the reduced Pt(IV) robustly triggers caspase-3/GSDME-mediated pyroptosis. This synergistic dual-pyroptosis pathway potently stimulates immunogenic cell death (ICD) and reverses the immunosuppressive TME by promoting dendritic cell maturation and CD8
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