alexa Interleukin-10 ablation promotes tumor development, growth, and metastasis.
Immunology

Immunology

Journal of Vaccines & Vaccination

Author(s): Tanikawa T, Wilke CM, Kryczek I, Chen GY, Kao J

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Interleukin-10 (IL-10) is a broadly acting immune inhibitory cytokine that is generally thought to support tumor growth. Here we challenge this view with evidence that genetic ablation of IL-10 in the mouse significantly heightens sensitivity to chemical carcinogenesis, growth of transplanted tumors, and formation of metastases. Tumor growth in IL-10-deficient (IL-10(-/-)) mice was associated with an increased level of myeloid-derived suppressor cells (MDSC) and CD4(+)Foxp3(+) regulatory T (Treg) cells in both the tumor microenvironment and the tumor-draining lymph nodes. IL-10(-/-) MDSCs express high levels of MHC and IL-1, and they efficiently induced formation of Treg cells. IL-1 signaling blockade reduced tumor growth mediated by IL-10 deficiency, associated with a partial rescue of tumor infiltration and function of effector T cells and a decrease in tumor angiogenesis and tumor infiltration by Treg cells. Taken together, our findings establish that endogenous IL-10 inhibits inflammatory cytokine production and hampers the development of Treg cells and MDSCs, two key components of the immunosuppressive tumor microenvironment, thereby inhibiting tumor development, growth, and metastasis.

This article was published in Cancer Res and referenced in Journal of Vaccines & Vaccination

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