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Priming Protective CD8 T Cell Immunity by DNA Vaccines Encoding Chimeric, Stress Protein-Capturing Tumor-Associated Antigen¹

Reinhold Schirmbeck^2,*, Petra Riedl^*, Mark Kupferschmitt^*, Ursula Wegenka^*, Hansjörg Hauser, Jason Rice, Andrea Kröger and Jörg Reimann^*

^* Department of Internal Medicine I, University of Ulm, Ulm, Germany; German Research Centre for Biotechnology, Braunschweig Germany; and Molecular Immunology Group, Tenovus Laboratory, Southampton University Hospitals Trust, Southampton, United Kingdom

DNA vaccines encoding heat shock protein (hsp)-capturing, chimeric peptides containing antigenic determinants of the tumor-associated Ag (TAA) gp70 (an envelope protein of endogenous retrovirus) primed stable, specific, and tumor-protective CD8 T cell immunity. Expression of gp70 transcripts was detectable in most normal tissues but was particularly striking in some (but not all) tumor cell lines tested (including the adenocarcinoma cell line CT26). An 200 residue gp70 fragment or its L^d-binding antigenic AH1 peptide cloned in-frame behind an hsp-capturing (cT₂₇₂) or noncapturing (T₆₀) N-terminal large SV40 tumor Ag sequence was expressed as either hsp-binding or -nonbinding chimeric Ags. Only hsp-capturing, chimeric fusion proteins were expressed efficiently in transfected cell lines and primed TAA-specific CD8 T cell immunity. This immunity mediated protection in the CT26 and mKSA models. A vaccination strategy based on delivering antigenic, hsp-associated TAA fragments can thus prime protective CD8 T cell immunity even if these TAA are of low intrinsic immunogenicity.

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				P. Riedl, A. Wieland, K. Lamberth, S. Buus, F. Lemonnier, K. Reifenberg, J. Reimann, and R. Schirmbeck Elimination of Immunodominant Epitopes from Multispecific DNA-Based Vaccines Allows Induction of CD8 T Cells That Have a Striking Antiviral Potential J. Immunol., July 1, 2009; 183(1): 370 - 380. [Abstract] [Full Text] [PDF]