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The Journal of Immunology, 1999, 162: 3141-3147.
Copyright © 1999 by The American Association of Immunologists

In Vivo and In Vitro Activation of T Cells After Administration of Ag-Negative Heat Shock Proteins1

Minka Breloer, Bernhard Fleischer and Arne von Bonin2

Bernhard-Nocht-Institute for Tropical Medicine, Hamburg, Germany

Heat shock proteins (HSP) Hsp70 and gp96 prime class I-restricted cytotoxic T cells against Ags present in the cells from which they were isolated. The immunization capacity of HSPs is believed to rely on their ability to bind antigenic peptides. In this study, we employed the well-established OVA and ß-galactosidase (ß-gal) antigenic model systems. We show that in vitro long-term established OVA and ß-gal-specific CTL clones release TNF-{alpha} and IFN-{gamma} when incubated with Ag-negative Hsp70 and gp96. In the absence of antigenic peptides, HSP-mediated secretion of TNF-{alpha} and IFN-{gamma} requires cell contact of the APC with the T cell but is not MHC-I restricted. Moreover, Hsp70 molecules purified from Ag-negative tissue, e.g., negative for antigenic peptide, are able to activate T cells in vivo, leading to significant higher frequencies in OVA-specific CD8+ T cells. In unprimed animals, these T cells lyse OVA-transfected cell lines and produce TNF-{alpha} and IFN-{gamma} after Ag stimulus. Taken together our data show that, besides the well-established HSP/peptide-specific CTL induction and activation, a second mechanism exists by which Hsp70 and gp96 molecules activate T cells in vivo and in vitro.




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