Abstract
Although the use of TNF-α in the treatment of cancer is restricted due to its non-specific cytotoxicity and narrow range of applications to different cancers in clinical trials, we investigated a safe anti-cancer drug by the use of engineered bacterial capsule harboring TNF-α. The engineered bacterial capsule was designed to target cancer cells, promote a tumor-suppressive environment, and increase the efficacy of existing cancer treatments, including chemotherapy, radiotherapy, and cell therapy. The engineered bacterial capsule was constructed with Salmonella capsulizing TNF-α protein, which was produced and capsulized by Salmonella to reduce side effects of the protein. This bacterial capsule induced a tumor-suppressive environment through the activation of natural killer cells. Engineered bacterial capsule invaded tumor cells, released TNF-α, and induced apoptosis of tumor cells without apparent side effects. In a murine melanoma model, the bacterial capsule of TNF-α significantly inhibited tumor growth by 80–100% and prolonged the survival of the mice. When tested in combination with chemotherapy (cisplatin), antibiotics, and vaccine, recombinant microbial treatment increased the anti-tumor effects of existing therapies. The anti-tumor effects of the bacterial capsule of TNF-α were also observed in cervical cancer, melanoma, breast cancer, colon cancer, and renal carcinoma. These results suggest that the bacterial capsule of TNF-α is a promising strategy for TNF-α treatment.
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Acknowledgments
This work was supported by KFDA and Korea Science & Engineering Foundation (Grant No. E00156).
This study was supported by a grant of the Korea Healthcare technology R&D Project, Ministry for Health, Welfare & Family Affairs, Republic of Korea. (A090228)
We are grateful to YuChang Park, YeSu Ju, and HaNa Nim for their expert, technical assistance.
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The authors declare that they have no conflict of interests.
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Fig. S1
Survival of recombinant bacteria in tumor-bearing mice. B16F10 tumor-bearing C57BL6 mice were subcutaneously inoculated with 1 × 108 S. typhimurium harboring TNF-α next to tumor. At 1, 12, and 24 h after treatment, the tumor region was homogenized. Tumor cell lysates were cultivated and the percent survival of recombinant bacteria was calculated. (DOC 71 kb)
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Yoon, W.S., Chae, Y.S., Hong, J. et al. Antitumor therapeutic effects of a genetically engineered Salmonella typhimurium harboring TNF-α in mice. Appl Microbiol Biotechnol 89, 1807–1819 (2011). https://doi.org/10.1007/s00253-010-3006-4
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DOI: https://doi.org/10.1007/s00253-010-3006-4