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Tumor-targeting attenuated Salmonella could induce certain antitumor therapeutic effect through its proliferation characteristic and the consequent activated immune response, while host defense cells represented by neutrophils would trap and eliminate these invading bacteria via producing excess hydrogen peroxide (H2O2)-including reactive oxygen species in the bacteria-infected tumor, thereby impairing the efficacy of the bacteria treatment of tumor. Herein, we attempt to combine bacteria treatment and oxygen-dependent radioimmunotherapy of tumor through injection of neutrophil-targeted nano-catalase into the bacteria-treated mice for perfect tumor treatment outcome. Denatured albumin is used to coat catalase and deliver it to the neutrophils infiltrated in bacteria-infected tumor tissue. Taking advantage of the generating H2O2 by neutrophils, easily-diffused oxygen is produced and spread the whole tumor under the catalysis of nano-enzyme, leading to enhanced radiotherapy of hypoxic tumor cells. Moreover, the optimized tumor microenvironment, synergistically caused by potent immune-stimulation of bacteria, generating oxygen and tumor radiotherapy, would boost the antitumor immunity. This novel combination therapy strategy holds great promise to provide new ideas for future clinical cancer treatment.
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