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pmid: 23686489
Abstract Tumor-infiltrating lymphocytes (TILs) are important prognostic factors in cancer progression and key players in cancer immunotherapy. Although γδ T lymphocytes can target a diversity of tumor cell types, their clinical manipulation is hampered by our limited knowledge of the molecular cues that determine γδ T cell migration toward tumors in vivo. In this study we set out to identify the chemotactic signals that orchestrate tumor infiltration by γδ T cells. We have used the preclinical transplantable B16 melanoma model to profile chemokines in tumor lesions and assess their impact on γδ TIL recruitment in vivo. We show that the inflammatory chemokine CCL2 and its receptor CCR2 are necessary for the accumulation of γδ TILs in B16 lesions, where they produce IFN-γ and display potent cytotoxic functions. Moreover, CCL2 directed γδ T cell migration in vitro toward tumor extracts, which was abrogated by anti-CCL2 neutralizing Abs. Strikingly, the lack of γδ TILs in TCRδ-deficient but also in CCR2-deficient mice enhanced tumor growth in vivo, thus revealing an unanticipated protective role for CCR2/CCL2 through the recruitment of γδ T cells. Importantly, we demonstrate that human Vδ1 T cells, but not their Vδ2 counterparts, express CCR2 and migrate to CCL2, whose expression is strongly deregulated in multiple human tumors of diverse origin, such as lung, prostate, liver, or breast cancer. This work identifies a novel protective role for CCL2/CCR2 in the tumor microenvironment, while opening new perspectives for modulation of human Vδ1 T cells in cancer immunotherapy.
Inflammation, Receptors, CCR2, Receptors, Antigen, T-Cell, gamma-delta, Neoplasms, Experimental, Flow Cytometry, Real-Time Polymerase Chain Reaction, Mice, Inbred C57BL, Mice, Lymphocytes, Tumor-Infiltrating, T-Lymphocyte Subsets, Tumor Microenvironment, Animals, Humans, Female, Chemokine CCL2, Signal Transduction, T-Lymphocytes, Cytotoxic
Inflammation, Receptors, CCR2, Receptors, Antigen, T-Cell, gamma-delta, Neoplasms, Experimental, Flow Cytometry, Real-Time Polymerase Chain Reaction, Mice, Inbred C57BL, Mice, Lymphocytes, Tumor-Infiltrating, T-Lymphocyte Subsets, Tumor Microenvironment, Animals, Humans, Female, Chemokine CCL2, Signal Transduction, T-Lymphocytes, Cytotoxic
citations This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically). | 151 | |
popularity This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network. | Top 1% | |
influence This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically). | Top 10% | |
impulse This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network. | Top 1% |