Abstract
Tumor hypoxia has been considered to induce tumor cell resistance to radiotherapy and anticancer chemotherapy, as well as predisposing for increased tumor metastases. Therefore, strategies for the eradication of the hypoxic tumor are highly desirable. Photodynamic therapy (PDT) is a new technique that can be used to treat tumors using laser irradiation to photochemically activate a photosensitizer. Compared to traditional radiotherapy and chemotherapy, photodynamic therapy has many advantages, such as good selectivity, low toxicity, and less trauma and resistance. However, PDT is oxygen-dependent, and the lack of oxygen in hypoxic tumors renders photodynamic therapy ineffective. Cyanobacteria, the earliest photosynthetic oxygen-generating organisms, can utilize water as an electron donor to reduce CO2 into organic carbon compounds along with continuously releasing oxygen under sunlight. Inspired by this, herein, cyanobacteria were used as a living carrier of photosensitizer conjugated upconversion nanoparticles (UCNP) to construct a self-supplying oxygen PDT system. Improvement in the PDT efficiency for hypoxic tumors can be achieved as a result of in situ oxygen production by cyanobacteria under near-infrared (NIR) light using UCNP as a light harvesting antenna. A successful demonstration of this concept would be of great significance and could open the door to a new generation of carrier systems in the field of hypoxia-targeted drug transport platforms.
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Acknowledgements
This work was supported by National Natural Science Foundation of China (Nos. 21977024, 21601046, and 31971304). Advanced Talents Incubation Program of the Hebei University (No. 801260201020). Funded by China Postdoctoral Science Foundation (No. 2019M650558), Beijing Postdoctoral Research Foundation and Beijing Chaoyang District Postdoctoral Research Fundation. We are grateful to Medical Comprehensive Experimental Center of Hebei University for the animal experiment.
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Cyanobacteria-based near-infrared light-excited self-supplying oxygen system for enhanced photodynamic therapy of hypoxic tumors
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Zhang, Y., Liu, H., Dai, X. et al. Cyanobacteria-based near-infrared light-excited self-supplying oxygen system for enhanced photodynamic therapy of hypoxic tumors. Nano Res. 14, 667–673 (2021). https://doi.org/10.1007/s12274-020-3094-0
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DOI: https://doi.org/10.1007/s12274-020-3094-0