Abstract
Despite the importance of immune response and environmental stress on head and neck cancer (HNC) outcomes, no current pre-clinical stress model includes a humanized immune system. We investigated the effects of chronic stress induced by social isolation on tumor growth and human immune response in subcutaneous HNC tumors grown in NSG-SGM3 mice engrafted with a human immune system. Tumor growth (p< 0.0001) and lung metastases (p= 0.035) were increased in socially isolated versus control animals. Chronic stress increased intra-tumoral CD4+ T-cell infiltrate (p= 0.005), plasma SDF-1 (p< 0.0001) expression, and led to tumor cell dedifferentiation toward a cancer stem cell phenotype (CD44+ /ALDHhigh , p= 0.025). Chronic stress induced immunophenotypic changes, increased tumor growth, and metastasis in HNC in a murine model with a humanized immune system. This model system may provide further insight into the immunologic and oncologic impact of chronic stress on patients with HNC.
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