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*
Imperial Cancer Research Fund Laboratory of Molecular Therapy, Imperial Cancer Research Fund Oncology Unit, Imperial College of Science and Medicine, Hammersmith Hospital, London, United Kingdom;
Molecular Medicine Program, Mayo Clinic, Rochester, MN 55905;
Experimental Oncology D, Istituto Nazionale Tumori, Milan, Italy; and
Department of Experimental Medicine and Pathology, Second Chair of Pathology, University of Rome La Sapienza, Rome, Italy
Previously, we reported that killing tumor cells in vivo with the
HSV thymidine kinase/ganciclovir system generates potent antitumor
immunity, determined in part by the mechanism by which the cells die
and by the levels of inducible heat shock protein (hsp) expression
induced during the process of cell death. Here, we show that induction
of hsp70 expression induces an infiltrate of T cells, macrophages, and
predominantly dendritic cells (DCs) into the tumors as well as an
intratumoral profile of Th1 cytokine expression (IFN-
, TNF-
, and
IL-12) and enhances immunogenicity via a T cell-mediated mechanism. In
addition, the protection conferred by hsp70 is both tumor and cell
specific. We also demonstrate that hsp70 targets immature APC to make
them significantly more able to capture Ags. This is likely to optimize
cross-priming of the infiltrating APC with tumor Ags, which are
simultaneously being released by the dying cells. In addition, using an
Myc epitope-tagged hsp70 expression vector, we present evidence that
hsp70 released from dying tumor cells is taken up directly into DCs and
may, therefore, be involved in direct chaperoning of Ags into DCs.
Taken together, our data suggest that hsp70 induction serves to signal
the immune system of the presence of an immunologically relevant
(dangerous) situation against which an immune reaction should be
raised.
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