TME induced TRAIL secretion from engineered macrophages for anti-tumor therapy
Yin, X.; huang, x.; Deng, B.; Zhou, H.; Shi, B.; Liu, J.; Shan, X.; fang, x.; Zhang, L.
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Capacity of tumor niche chemotaxis and long-term persistency making macrophage as great vehicles for anti-tumor factor delivery. Macrophages-based delivery of chemokines or cytokines have been tested for tissue homeostasis and cancer repression. TRAIL as a promising anti-tumor cytokine, made little clinical progress due to limited stability and off-target toxicity. Here we engineered macrophages with tumor micro-environment (TME)-induced trimerized CP1-TRAIL secretion under the TME specific promoter Arg1 (Tri-TRAIL-iM). The Tri-TRAIL-iM cells displayed high specific inducible activity in both cell-based co-culture assay and in tumor baring mice models. Compared to normal TRAIL over-expressed macrophages under none-inducible promoter, Tri-TRAIL-iM infiltrated to tumor sites and showed superior apoptosis induction of cancer cells and tumor growth repression as well as less systemic side effect. This inducible delivery TRAIL strategy can be effectively further applied in clinical studies and can be coupled with other engineered methods to maximize the therapeutic outcomes for solid tumors.
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