TLR2/6 agonists and interferon-gamma induce human melanoma cells to produce CXCL10

International Journal of Cancer. Journal International Du Cancer
Ileana S MauldinCraig L Slingluff

Abstract

Clinical approaches to treat advanced melanoma include immune therapies, whose benefits depend on tumor-reactive T-cell infiltration of metastases. However, most tumors lack significant immune infiltration prior to therapy. Selected chemokines promote T-cell migration into tumors; thus, agents that induce these chemokines in the tumor microenvironment (TME) may improve responses to systemic immune therapy. CXCL10 has been implicated as a critical chemokine supporting T-cell infiltration into the TME. Here, we show that toll-like receptor (TLR) agonists can induce chemokine production directly from melanoma cells when combined with IFNγ treatment. We find that TLR2 and TLR6 are widely expressed on human melanoma cells, and that TLR2/6 agonists (MALP-2 or FSL-1) synergize with interferon-gamma (IFNγ) to induce production of CXCL10 from melanoma cells. Furthermore, melanoma cells and immune cells from surgical specimens also respond to TLR2/6 agonists and IFNγ by upregulating CXCL10 production, compared to treatment with either agent alone. Collectively, these data identify a novel mechanism for inducing CXCL10 production directly from melanoma cells, with TLR2/6 agonists +IFNγ and raise the possibility that intratumoral administr...Continue Reading

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