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Engineering bacteria toward tumor targeting for cancer treatment: current state and perspectives

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Abstract

One of the primary limitations of cancer therapy is lack of selectivity of therapeutic agents to tumor cells. Current efforts are focused on discovering and developing anticancer agents that selectively target only tumor cells and spare normal cells to improve the therapeutic index. The use of preferentially replicating bacteria as an oncolytic agent is one of the innovative approaches for the treatment of cancer. This is based on the observation that some obligate or facultative anaerobic bacteria are capable of multiplying selectively in tumors and inhibiting their growth. Meanwhile, bacteria have been demonstrated to colonize and destroy tumor, and have emerged as biological gene vectors to tumor microenvironment. To improve the efficacy and safety of the bacterial therapy, a further understanding of bacteria between with immune system is required. Furthermore, we want to evaluate how bacterial infection facilitates the “bystander effect” of chemotherapeutic agent and assess if it can be used for additional antitumor effect when combined with chemotherapy. This study may not only evaluate therapeutic efficacy of bacteria for the treatment of cancer but also elucidate the mechanisms underlying antitumor activities mediated by bacteria, which involve host immune responses and the cellular molecular responses.

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Acknowledgments

This work was supported by grants from National Science Council (NSC 100-2320-B-039-024) and China Medical University (CMU-99-N2-08).

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The author declares that he has no conflict of interests.

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  1. Department of Microbiology, School of Medicine, China Medical University, 91 Hsueh-Shih Road, Taichung, 40402, Taiwan

    Che-Hsin Lee

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Correspondence to Che-Hsin Lee.

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Lee, CH. Engineering bacteria toward tumor targeting for cancer treatment: current state and perspectives. Appl Microbiol Biotechnol 93, 517–523 (2012). https://doi.org/10.1007/s00253-011-3695-3

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