材料科学
激进的
肿瘤微环境
活性氧
生物物理学
纳米技术
光化学
化学
免疫系统
有机化学
生物化学
医学
免疫学
生物
作者
Yongcan Li,Jiansen Huang,Honglian Yu,Yinmin Zhao,Zhigang Xu,Yuejun Kang,Peng Xue
出处
期刊:Small
[Wiley]
日期:2022-08-21
卷期号:18 (38)
被引量:15
标识
DOI:10.1002/smll.202203080
摘要
The therapeutic exploration of nano-zirconia semiconductor largely remains untouched in the field of fundamental science to date. Here, a robust nano-sonosensitizer of ZrO2-x @Pt is strategically formulated by in situ growth of Pt nanocrystal onto the surface of oxygen-deficient ZrO2-x . Compared to 3.09 eV of nano-ZrO2-x , the bandgap of ZrO2-x @Pt Schottky junction is narrowed down to 2.74 eV. The band bending and bandgap narrowing enables an enhanced e- /h+ separation in the presence of aPt electron sink, which facilitates a high yield of singlet oxygen (1 O2 ) and hydroxyl radicals (·OH) under ultrasound (US) irradiation. Moreover, nanozyme Pt with catalase-mimic activity can promote 1 O2 generation by relieving the hypoxic tumor microenvironment. Upon further modification of 2,2'-azobis[2-(2-imidazolin-2-yl)propane] dihydrochloride (AIPH), US-stimulated local thermal shock can disintegrate AIPH to create cytotoxic alkyl radicals (• R). US-triggered reactive oxygen species generation and hyperthermia-induced alkyl radical production lead to severe and irreversible tumor cell death. Such combinatorial sonodynamic-thermodynamic therapy benefits the tumor eradication and metastasis inhibition at the animal level, with the aid of immunogenetic cell death and immune checkpoint blockade. Taken together, this proof-of-concept paradigm expands the medical use of nano-zirconia and provides useful insights for its therapeutic perspectives.
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