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Theranostics 2020; 10(6):2453-2462. doi:10.7150/thno.42981 This issue Cite

Research Paper

Tumor pH-responsive metastable-phase manganese sulfide nanotheranostics for traceable hydrogen sulfide gas therapy primed chemodynamic therapy

Ting He^1,2‡, Xialing Qin^1‡, Chao Jiang¹, Dawei Jiang¹, Shan Lei¹, Jing Lin¹, Wei-Guo Zhu³, Junle Qu², Peng Huang^1✉

1. Marshall Laboratory of Biomedical Engineering, International Cancer Center, Laboratory of Evolutionary Theranostics (LET), School of Biomedical Engineering, Shenzhen University Health Science Center, Shenzhen 518060, China.
2. Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China.
3. Guangdong Key Laboratory of Genome Instability and Human Disease Prevention, Carson International Cancer Center, Department of Biochemistry and Molecular Biology, Shenzhen.
University School of Medicine, Shenzhen 518055, China.
‡ These authors contributed equally to this work.

✉ Corresponding author: Peng Huang. 1066 Xueyuan Boulevard, Shenzhen University Health Science Center, Shenzhen, 51860, China. E-mail: peng.huangedu.cn.

Abstract

Manganese-based nanomaterials have piqued great interest in cancer nanotheranostics, owing to their excellent physicochemical properties. Here we report a facile wet-chemical synthesis of size-controllable, biodegradable, and metastable γ-phase manganese sulfide nanotheranostics, which is employed for tumor pH-responsive traceable gas therapy primed chemodynamic therapy (CDT), using bovine serum albumin (BSA) as a biological template (The final product was denoted as MnS@BSA). The as-prepared MnS@BSA can be degraded in response to the mildly acidic tumor microenvironment, releasing hydrogen sulfide (H₂S) for gas therapy and manganese ions for magnetic resonance imaging (MRI) and CDT. In vitro experiments validated the pH-responsiveness of MnS@BSA at pH 6.8 and both H₂S gas and •OH radicals were detected during its degradation. In vivo experiments showed efficiently tumor turn-on T₁-weighted MRI, significantly suppressed tumor growth and greatly prolonged survival of tumor-bearing mice following intravenous administration of MnS@BSA. Our findings indicated that MnS@BSA nanotheranostics hold great potential for traceable H₂S gas therapy primed CDT of cancer.

Keywords: manganese sulfide, hydrogen sulfide, gas therapy, chemodynamic therapy, nanotheranostics.

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