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- W2227194925 abstract "Abstract One of the mechanisms by which malignancies can induce immune suppression is through the production of cytokines that affect the maturation and differentiation of inflammatory cells in the tumor microenvironment. Semaphorin 4D (Sema4D) is a proangiogenic cytokine produced by several malignancies, which has been described in the regulation of the immune system. In the present study, we examined the role of human head and neck squamous cell carcinoma (HNSCC)–secreted Sema4D on myeloid cell differentiation. CD33+ cells cultured in HNSCC cell line–derived conditioned medium differentiated into myeloid derived suppressor cells (MDSC) (CD33+CD11b+HLA-DR−/low). The addition of anti-Sema4D Ab to HNSCC conditioned medium significantly reduced the expansion of the MDSC population. Similarly, knockdown of Sema4D in an HNSCC cell line resulted in a loss of MDSC function as shown by a decrease in the production of the immune-suppressive cytokines arginase-1, TGF-β, and IL-10 by MDSC, concomitant with recovery of T cell proliferation and IFN-γ production following stimulation of CD3/CD28. Importantly, CD33+ myeloid and T cells cultured in conditioned medium of HNSCC cells in which Sema4D was knocked down promoted antitumor inflammatory profile, through recovery of the effector T cells (CD4+T-bet+ and CD8+T-bet+), as well as a decrease in regulatory T cells (CD4+CD25+FOXP3+). We also showed that Sema4D was comparable to GM-CSF in its induction of MDSC. Collectively, this study describes a novel immunosuppressive role for Sema4D in HNSCC through induction of MDSC, and it highlights Sema4D as a therapeutic target for future studies to enhance the antitumorigenic inflammatory response in HNSCC and other epithelial malignancies." @default.
- W2227194925 created "2016-06-24" @default.
- W2227194925 creator A5060580347 @default.
- W2227194925 creator A5063401975 @default.
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- W2227194925 date "2016-02-01" @default.
- W2227194925 modified "2023-09-30" @default.
- W2227194925 title "Human Head and Neck Squamous Cell Carcinoma–Associated Semaphorin 4D Induces Expansion of Myeloid-Derived Suppressor Cells" @default.
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- W2227194925 doi "https://doi.org/10.4049/jimmunol.1501293" @default.
- W2227194925 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/4722498" @default.
- W2227194925 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/26740106" @default.
- W2227194925 hasPublicationYear "2016" @default.
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