Bacterial outer membrane vesicles suppress tumor by interferon-γ-mediated antitumor response

Oh Youn Kim (), Hyun Taek Park, Nhung Thi Hong Dinh, Seng Jin Choi, Jaewook Lee, Ji Hyun Kim, Seung-Woo Lee and Yong Song Gho ()
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Oh Youn Kim: Pohang University of Science and Technology
Hyun Taek Park: Pohang University of Science and Technology
Nhung Thi Hong Dinh: Pohang University of Science and Technology
Seng Jin Choi: Pohang University of Science and Technology
Jaewook Lee: Pohang University of Science and Technology
Ji Hyun Kim: Pohang University of Science and Technology
Seung-Woo Lee: Pohang University of Science and Technology
Yong Song Gho: Pohang University of Science and Technology

Nature Communications, 2017, vol. 8, issue 1, 1-9

Abstract: Abstract Gram-negative bacteria actively secrete outer membrane vesicles, spherical nano-meter-sized proteolipids enriched with outer membrane proteins, to the surroundings. Outer membrane vesicles have gained wide interests as non-living complex vaccines or delivery vehicles. However, no study has used outer membrane vesicles in treating cancer thus far. Here we investigate the potential of bacterial outer membrane vesicles as therapeutic agents to treat cancer via immunotherapy. Our results show remarkable capability of bacterial outer membrane vesicles to effectively induce long-term antitumor immune responses that can fully eradicate established tumors without notable adverse effects. Moreover, systematically administered bacterial outer membrane vesicles specifically target and accumulate in the tumor tissue, and subsequently induce the production of antitumor cytokines CXCL10 and interferon-γ. This antitumor effect is interferon-γ dependent, as interferon-γ-deficient mice could not induce such outer membrane vesicle-mediated immune response. Together, our results herein demonstrate the potential of bacterial outer membrane vesicles as effective immunotherapeutic agent that can treat various cancers without apparent adverse effects.

Date: 2017
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DOI: 10.1038/s41467-017-00729-8

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