Journal
CURRENT OPINION IN IMMUNOLOGY
Volume 15, Issue 2, Pages 148-154Publisher
CURRENT BIOLOGY LTD
DOI: 10.1016/S0952-7915(03)00007-4
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IFN-gamma contributes to the rejection of transplantable tumors and the inhibition of methylcholanthrene (MCA)-induced carcinogenesis by different mechanisms. In most tumor transplantation models, tumor rejection requires IFN-gamma receptor expression by host cells, but not by tumor cells. IFN-gamma produced by either CD4(+) or CD8(+) T cells acts on non-hematopoietic tumor stroma cells and, either directly or indirectly, induces angiostasis. This prevents rapid tumor burden and allows residual tumor cells to be eliminated. In some models, IFN-gamma also contributes to the destruction of existing tumor blood vessels. During MCA-induced tumorigenesis IFN-gamma is involved in the inhibition of MCA diffusion by encapsulation and reduction of DNA damage. This mechanism may primarily protect tissue from damage and simultaneously inhibit tumor development.
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