Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 60, Issue 25, Pages 14051-14059Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202102703
Keywords
Ca2+ overload; cancer sono-immunotherapy; immune checkpoint blockade; pH-regulated ROS generation; sonosensitizers
Categories
Funding
- National Key R&D Program of China [2020YFA0710700]
- National Natural Science Foundation of China [81627901, 81573013, 81703031, 81773653]
- opening foundation of Hubei key laboratory of molecular imaging [2020fzyx025]
- Ministry of Education Singapore, Academic Research Fund Tier 1 [2019-T1-002-045 RG125/19, RT05/20]
- Ministry of Education Singapore, Academic Research Fund Tier 2 [MOE2018-T2-2-042]
- A*STAR SERC AME Programmatic Fund (SERC) [A18A8b0059]
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The study introduces a smart nanosonosensitizer TiO2@CaP which enhances the generation of reactive oxygen species (ROS) under ultrasound activation, inducing mitochondrial dysfunction in the tumor microenvironment and promoting immunogenic cell death, resulting in T-cell infiltration and systemic antitumor immunity. This approach holds promise for developing TME-activatable sonosensitizers with temporospatial control over antitumor responses.
Despite the promise of sonodynamic processes in cancer therapy, existing sonosensitizers often fail to regulate the generation of reactive oxygen species (ROS) against tumors, potentially leading to off-target toxicity to normal tissues. We report a transformable core-shell nanosonosensitizer (TiO2@CaP) that reinvigorates ROS generation and dissolves its CaP shell to release Ca2+ in an acidic tumor microenvironment (TME) under ultrasound activation. Thus, TiO2@CaP acts as a smart nanosonosensitizer that specifically induces mitochondrial dysfunction via overloading intracellular Ca2+ ions to synergize with the sonodynamic process in the TME. TiO2@CaP substantially enhances immunogenic cell death, resulting in enhanced T-cell recruitment and infiltration into the immunogenic cold tumor (4T1). In conjunction with checkpoint blockade therapy (anti-PD 1), TiO2@CaP-mediated sonodynamic therapy elicits systemic antitumor immunity, leading to regression of non-treated distant tumors and inhibition of lung metastasis. This work paves the way to development of smart TME-activatable sonosensitizers with temporospatial control over antitumor responses.
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