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Characterization of Heat Shock Protein 110 and Glucose-Regulated Protein 170 as Cancer Vaccines and the Effect of Fever-Range Hyperthermia on Vaccine Activity¹

Xiang-Yang Wang^*, Latif Kazim^*, Elizabeth A. Repasky and John R. Subjeck^2,*

Departments of ^* Molecular and Cellular Biophysics and Immunology, Roswell Park Cancer Institute, Buffalo, NY 14263

Several studies have confirmed that certain stress proteins can function as potent vaccines against a specific cancer when purified from the same tumor. Recent studies of two long-recognized but unstudied stress proteins, heat shock protein (hsp) 110 and glucose-regulated protein (grp) 170, have shown them to be efficient peptide chain-binding proteins. The present investigation examines the vaccine potential of hsp110 and grp170. First, it is shown that prior vaccination with hsp110 or grp170 purified from methylcholanthrene-induced fibrosarcoma caused complete regression of the tumor. In a second tumor model, hsp110 or grp170 purified from Colon 26 tumors led to a significant growth inhibition of this tumor. In addition, hsp110 or grp170 immunization significantly extended the life span of Colon 26 tumor-bearing mice when applied after tumor transplantation. A tumor-specific cytotoxic T lymphocyte response developed in the mice immunized with tumor-derived hsp110 or grp170. Furthermore, treatments of the mice with bone marrow-derived dendritic cells pulsed with these two proteins from tumor also elicited a strong antitumor response. Last, we showed that mild, fever-like hyperthermic conditions enhance the vaccine efficiency of hsp110 as well as heat shock cognate 70, but not grp170. These studies indicate that hsp110 and grp170 can be used in hsp-based cancer immunotherapy, that Ag-presenting dendritic cells can be used to mediate this therapeutic approach, and that fever-level hyperthermia can significantly enhance the vaccine efficiency of hsps.

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