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  • Title: Inhibition of early tumor growth requires J alpha 18-positive (natural killer T) cells.
    Author: Stewart TJ, Smyth MJ, Fernando GJ, Frazer IH, Leggatt GR.
    Journal: Cancer Res; 2003 Jun 15; 63(12):3058-60. PubMed ID: 12810627.
    Abstract:
    The role of natural killer T (NKT) cells in the immune response to tumor cells has been largely unexplored. As a model of adoptive tumor immunotherapy, cells from the draining lymph nodes of mice immunized with a tumor-specific or irrelevant antigen were transferred to naïve recipients with established tumor. Inhibition of early tumor growth (day 4) required the transfer of both CD8(+) and J alpha 18(+) (NKT) cells from immunized animals without regard to immunogen. In contrast, CD8(+) cells, but not J alpha 18(+) cells, were necessary for the inhibition of late tumor growth (day 8). Thus, the developing tumor changes in sensitivity to NKT-mediated events and the role for NKT cells cannot be replaced by the presence of tumor-specific cells during early tumor growth. This suggests that recruitment/activation of J alpha 18(+) NKT cells is an important consideration during the immune therapy of early stage tumors.
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