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498 results on '"Zhou, Wenhu"'

42. Tumor Cell-Targeting and Tumor Microenvironment–Responsive Nanoplatforms for the Multimodal Imaging-Guided Photodynamic/Photothermal/Chemodynamic Treatment of Cervical Cancer

Author

Wang,Ying, Xu,Yiyan, Song,Jiayu, Liu,Xueting, Liu,Sijia, Yang,Nan, Wang,Le, Liu,Yujie, Zhao,Yiwei, Zhou,Wenhu, Zhang,Yunyan, Wang,Ying, Xu,Yiyan, Song,Jiayu, Liu,Xueting, Liu,Sijia, Yang,Nan, Wang,Le, Liu,Yujie, Zhao,Yiwei, Zhou,Wenhu, and Zhang,Yunyan

Abstract

Ying Wang,1,* Yiyan Xu,2,* Jiayu Song,1 Xueting Liu,1 Sijia Liu,1 Nan Yang,1 Le Wang,1 Yujie Liu,1 Yiwei Zhao,1 Wenhu Zhou,3,4 Yunyan Zhang1 1Department of Gynecological Radiotherapy, Harbin Medical University Cancer Hospital, Harbin, Heilongjiang, 150081, People’s Republic of China; 2Department of Vascular Surgery, The First Affiliated Hospital of Guangzhou Medical University, Guangzhou, Guangdong, 510120, People’s Republic of China; 3Xiangya School of Pharmaceutical Sciences, Central South University, Changsha, Hunan, 410013, People’s Republic of China; 4Hunan Key Laboratory of The Research and Development of Novel Pharmaceutical Preparations, School of Pharmaceutical Science, Changsha Medical University, Changsha, 410219, People’s Republic of China*These authors contributed equally to this workCorrespondence: Yunyan Zhang, Department of Gynecological Radiotherapy, Harbin Medical University Cancer Hospital, No. 150, Haping Road, Nangang District, Harbin, Heilongjiang Province, 150081, People’s Republic of China, Tel +86 13604843878, Fax +86 451 85718392, Email zhangyunyan@hrbmu.edu.cn Wenhu Zhou, Xiangya School of Pharmaceutical Sciences, Central South University, 172 Tongzipo Road, Changsha, Hunan, 410013, People’s Republic of China, Tel +86 15111469284, Fax +86 731 88710591, Email zhouwenhuyaoji@163.comPurpose: Phototherapy, known for its high selectivity, few side effects, strong controllability, and synergistic enhancement of combined treatments, is widely used in treating diseases like cervical cancer.Methods: In this study, hollow mesoporous manganese dioxide was used as a carrier to construct positively charged, poly(allylamine hydrochloride)–modified nanoparticles (NPs). The NP was efficiently loaded with the photosensitizer indocyanine green (ICG) via the addition of hydrogen phosphate ions to produce a counterion aggregation effect. HeLa cell membrane encapsulation was performed to achieve the final M-HMnO2@ICG NP. I

Published
2024

43. Repolarizing neutrophils via MnO2 nanoparticle-activated STING pathway enhances Salmonella-mediated tumor immunotherapy.

Author

Lu, Shan, Mi, Ze, Liu, Peng, Ding, Jinsong, Ma, Yiran, Yang, Jieru, Rong, Pengfei, and Zhou, Wenhu

Subjects
NEUTROPHILS, IMMUNOTHERAPY, BACTERIAL colonies, TUMOR growth, TUMOR microenvironment, T cells
Abstract

Engineered Salmonella has emerged as a promising microbial immunotherapy against tumors; however, its clinical effectiveness has encountered limitations. In our investigation, we unveil a non-dose-dependent type of behavior regarding Salmonella's therapeutic impact and reveal the regulatory role of neutrophils in diminishing the efficacy of this. While Salmonella colonization within tumors recruits a substantial neutrophil population, these neutrophils predominantly polarize into the pro-tumor N2 phenotype, elevating PD-L1 expression and fostering an immunosuppressive milieu within the tumor microenvironment. In order to bypass this challenge, we introduce MnO2 nanoparticles engineered to activate the STING pathway. Harnessing the STING pathway to stimulate IFN-β secretion prompts a shift in neutrophil polarization from the N2 to the N1 phenotype. This strategic repolarization remodels the tumor immune microenvironment, making the infiltration and activation of CD8+ T cells possible. Through these orchestrated mechanisms, the combined employment of Salmonella and MnO2 attains the synergistic enhancement of anti-tumor efficacy, achieving the complete inhibition of tumor growth within 20 days and an impressive 80% survival rate within 40 days, with no discernible signs of significant adverse effects. Our study not only unveils the crucial in vivo constraints obstructing microbial immune therapy but also sets out an innovative strategy to augment its efficacy. These findings pave the way for advancements in cell-based immunotherapy centered on leveraging the potential of neutrophils. [ABSTRACT FROM AUTHOR]

Published
2024
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