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Targeting the effector site with IFN-αβ-inducing TLR ligands reactivates tumor-resident CD8 T cell responses to eradicate established solid tumors

Currie, A.J., van der Most, R.G., Broomfield, S.A., Prosser, A.C., Tovey, M.G. and Robinson, B.W.S. (2008) Targeting the effector site with IFN-αβ-inducing TLR ligands reactivates tumor-resident CD8 T cell responses to eradicate established solid tumors. Journal of Immunology, 180 (3). pp. 1535-1544.

Link to Published Version: http://www.jimmunol.org/content/180/3/1535.full
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Abstract

Effective antitumor CD8 T cell responses may be activated by directly targeting the innate immune system within tumors. We investigated this response by injecting a range of TLR agonists into established tumors using a mouse model of malignant mesothelioma stably transduced with the hemagglutinin (HA) gene as a marker Ag (AB1-HA). Persistent delivery of the dsRNA mimetic poly(I:C) into established AB1-HA tumors resulted in complete tumor resolution in 40% of mice, with the remaining mice also showing a significant delay in tumor progression. Experiments in athymic nude mice along with CD8 depletion and IFN-αβ blocking studies revealed that tumor resolution required both CD8 T cells and type I IFN induction, and was associated with local changes in MHC class I expression. Surprisingly, however, tumor resolution was not associated with systemic dissemination or tumor infiltration of effector CD8 T cells. Instead, the antitumor response was critically dependent on the reactivation of tumor-resident CD8 T cell responses. These studies suggest that, once reactivated, pre-existing local CD8 T cell responses are sufficient to resolve established tumors and that in situ type I IFN is a determining factor.

Publication Type: Journal Article
Publisher: The American Association of Immunologists, Inc.
URI: http://researchrepository.murdoch.edu.au/id/eprint/9535
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