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Liu, Jian‐Feng; Ma, Si‐Rui; Mao, Liang; Bu, Lin‐Lin; Yu, Guang‐Tao; Li, Yi‐Cun; Huang, Cong‐Fa; Deng, Wei‐Wei; Kulkarni, Ashok B.; Zhang, Wen‐Feng; Sun, Zhi‐Jun
Molecular oncology, February 2017, Volume: 11, Issue: 2Journal Article
T‐cell immunoglobulin mucin 3 (TIM3) contributes to immune suppression during progression of many cancers, but the precise role of TIM3 in head and neck squamous cell carcinoma (HNSCC) is not clearly understood. In this study, we report that TIM3 expression was significantly up‐regulated in patients with HNSCC and associated with lymph node metastasis. Additionally, TIM3 expression was increased in patients with recurrent HNSCC and patients with preradiotherapy or prechemotherapy. We also characterized CD8+ T cells and CD11b+CD33+ myeloid‐derived suppressor cells (MDSCs) in human HNSCC, and found that their expression was positively correlated with TIM3 expression. To determine the underlying mechanism of TIM3 in immune response during HNSCC progression, we utilized the Tgfbr1/Pten 2cKO HNSCC mouse model with TIM3 overexpression. Treatment with anti‐TIM3 monoclonal antibody effectively suppressed tumor growth through restoring effector T‐cell function by targeting CD4+TIM3+ cells and CD8+TIM3+ cells and decreasing MDSCs. Our findings demonstrate TIM3 expression in patients with HNSCC and suggest anti‐TIM3 immunotherapy as a novel therapeutic approach for effective treatment of HNSCC. TIM3 is significantly increased in HNSCC, and its expression is correlated with CD8, CD11b, and CD33. TIM3 blockade reduces tumor growth in HNSCC mouse model by restoring effector T cells and reducing MDSCs in HNSCC mouse model.
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