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Journal Article
Research Support, Non-U.S. Gov't
Anti-tumor immunity via the superoxide-eosinophil axis induced by a lipophilic component of Mycobacterium lipomannan.
International Immunology 2017 November 2
Mycobacterium bovis Bacille Calmette-Guérin (BCG) has been shown to possess potent anti-tumor activity particularly in various animal models, while the cellular and molecular mechanisms underlying its activity are not well understood. We found that lipomannan (BCG-LM), a lipophilic component of the mycobacterial cell envelope, specifically inhibits tumor growth and induces the infiltration of eosinophils at local tumor invasion sites. In contrast, neither lipoarabinomannan (BCG-LAM) nor the cell wall of Mycobacterium bovis BCG (BCG-CW) exerted anti-tumor immunity. BCG-LM enhances cytotoxic activity of eosinophils via the increased production of superoxide. Global transcriptomic analyses of BCG-LM-pulsed dendritic cells identified C-C motif ligand (CCL) 5 as a crucial chemokine for the anti-tumor immunity induced by BCG-LM, indicating that CCL5 plays an important role for the accumulation of eosinophils in the tumor microenvironment. Furthermore, BCG-LM and memory Th2 cells exerted a synergetic effect on tumor progression by cooperatively enhancing the eosinophil function. Thus, this study revealed an un-identified BCG-LM-mediated anti-tumor mechanism via superoxide produced by infiltrated eosinophils in the tumor microenvironment. Since BCG-LM activates this unique pathway, it may have potent therapeutic potential as immune cell therapy for cancer patients.
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