肿瘤微环境
血管生成
化学
癌症研究
体内
葡萄糖氧化酶
细胞凋亡
癌细胞
药理学
谷胱甘肽
癌症
生物化学
医学
内科学
生物
肿瘤细胞
酶
生物技术
作者
Caiyun Zhang,Peng Wang,Ya' Nan Zhang,Pingli Lu,Xiao-Dan Huang,Yinfeng Wang,Lang Ran,Huan Xin,Xiaotong Xu,Wenjuan Gao,Yi Sun,Li Zhang,Guilong Zhang
标识
DOI:10.1186/s12951-023-01814-5
摘要
Chemodynamic therapy of cancer is limited by insufficient endogenous H2O2 generation and acidity in the tumor microenvironment (TME). Herein, we developed a biodegradable theranostic platform (pLMOFePt-TGO) involving composite of dendritic organosilica and FePt alloy, loaded with tamoxifen (TAM) and glucose oxidase (GOx), and encapsulated by platelet-derived growth factor-B (PDGFB)-labeled liposomes, that effectively uses the synergy among chemotherapy, enhanced chemodynamic therapy (CDT), and anti-angiogenesis. The increased concentration of glutathione (GSH) present in the cancer cells induces the disintegration of pLMOFePt-TGO, releasing FePt, GOx, and TAM. The synergistic action of GOx and TAM significantly enhanced the acidity and H2O2 level in the TME by aerobiotic glucose consumption and hypoxic glycolysis pathways, respectively. The combined effect of GSH depletion, acidity enhancement, and H2O2 supplementation dramatically promotes the Fenton-catalytic behavior of FePt alloys, which, in combination with tumor starvation caused by GOx and TAM-mediated chemotherapy, significantly increases the anticancer efficacy of this treatment. In addition, T2-shortening caused by FePt alloys released in TME significantly enhances contrast in the MRI signal of tumor, enabling a more accurate diagnosis. Results of in vitro and in vivo experiments suggest that pLMOFePt-TGO can effectively suppress tumor growth and angiogenesis, thus providing an exciting potential strategy for developing satisfactory tumor theranostics.
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