Volume 64, Issue 28 e202505930
Research Article

Evoking Simultaneous Ferroptosis and Apoptosis by a Dual-Locked Platinum (IV) Prodrug for Synergistic Chemo-immunotherapy

He Meng

He Meng

MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, IGCME, School of Chemistry, Sun Yat-Sen University, Guangzhou, 510006 China

Both authors contributed equally to this work.

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Jinhui Wang

Jinhui Wang

MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, IGCME, School of Chemistry, Sun Yat-Sen University, Guangzhou, 510006 China

Both authors contributed equally to this work.

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Hongyu Wen

Hongyu Wen

MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, IGCME, School of Chemistry, Sun Yat-Sen University, Guangzhou, 510006 China

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Zilong Xu

Zilong Xu

MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, IGCME, School of Chemistry, Sun Yat-Sen University, Guangzhou, 510006 China

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Liuruiqi Luo

Liuruiqi Luo

MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, IGCME, School of Chemistry, Sun Yat-Sen University, Guangzhou, 510006 China

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Wenkai Lin

Wenkai Lin

MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, IGCME, School of Chemistry, Sun Yat-Sen University, Guangzhou, 510006 China

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Kai Lu

Kai Lu

MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, IGCME, School of Chemistry, Sun Yat-Sen University, Guangzhou, 510006 China

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Yuxiang Lu

Yuxiang Lu

MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, IGCME, School of Chemistry, Sun Yat-Sen University, Guangzhou, 510006 China

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Jing Wang

Jing Wang

MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, IGCME, School of Chemistry, Sun Yat-Sen University, Guangzhou, 510006 China

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Yufang Xiong

Yufang Xiong

MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, IGCME, School of Chemistry, Sun Yat-Sen University, Guangzhou, 510006 China

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Jianqiao Xu

Jianqiao Xu

MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, IGCME, School of Chemistry, Sun Yat-Sen University, Guangzhou, 510006 China

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Zong-Wan Mao

Corresponding Author

Zong-Wan Mao

MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, IGCME, School of Chemistry, Sun Yat-Sen University, Guangzhou, 510006 China

E-mail: [email protected], [email protected]

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Wei Xia

Corresponding Author

Wei Xia

MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, IGCME, School of Chemistry, Sun Yat-Sen University, Guangzhou, 510006 China

E-mail: [email protected], [email protected]

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First published: 05 May 2025
Citations: 1

Graphical Abstract

A dual-locked Pt(IV) prodrug combines a TLR7/8 agonist (IMDQ) with a GGT-responsive moiety. Reduction to Pt(II) triggers GGT-mediated cleavage of axial ligands, releasing IMDQ to activate immunity. TLR7/8 signaling boosts T-cell infiltration into tumors and stimulates tumor-associated macrophages (TAMs) and dendritic cells (DCs). Synergy between platinum chemotherapy and immune activation achieves potent antitumor efficacy.

Abstract

While platinum-based chemotherapeutics have revolutionized cancer treatment, their clinical potential is limited by off-target toxicity and restricted antitumor mechanisms. Herein, we introduce a dual-locked Pt(IV) prodrug designed for tumor-specific activation, combining platinum-based chemotherapy with TLR7/8-mediated immunotherapy. The prodrug features a γ-glutamyl-caged TLR7/8 agonist as an axial ligand, enabling sequential activation by elevated glutathione (GSH) and γ-glutamyltranspeptidase (GGT) in the tumor microenvironment. Reduction of the Pt(IV) core releases cisplatin and depletes intracellular reductants, amplifying reactive oxygen species to trigger synergistic ferroptosis and apoptosis. Concurrently, GGT-cleaved axial ligand activates tumor-associated macrophages and dendritic cells, repolarizing immunosuppressive M2-like macrophages to pro-inflammatory M1-like phenotypes while recruiting effector and memory T cells. In murine models, the Pt(IV) prodrug demonstrated potent antitumor efficacy by confining immune activation to malignant tissues, eradicating primary tumors, and establishing durable protective immunity against recurrence. This spatiotemporally controlled dual-release strategy minimizes systemic toxicity while synergizing chemotherapy and immunotherapy, offering a transformative approach for targeted cancer therapy.

Conflict of Interests

The authors declare no conflict of interest.

Data Availability Statement

The data that support the findings of this study are available in the supplementary material of this article.

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