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Journal of Virology, July 2001, p. 6584-6600, Vol. 75, No. 14
0022-538X/01/$04.00+0   DOI: 10.1128/JVI.75.14.6584-6600.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.

Experimental Preemptive Immunotherapy of Murine Cytomegalovirus Disease with CD8 T-Cell Lines Specific for ppM83 and pM84, the Two Homologs of Human Cytomegalovirus Tegument Protein ppUL83 (pp65)

Rafaela Holtappels, Jürgen Podlech, Natascha K. A. Grzimek, Doris Thomas, Marcus-Folker Pahl-Seibert, and Matthias J. Reddehase*

Institute for Virology, Johannes Gutenberg University, 55101 Mainz, Germany

Received 27 February 2001/Accepted 16 April 2001

CD8 T cells are the principal antiviral effectors controlling cytomegalovirus (CMV) infection. For human CMV, the virion tegument protein ppUL83 (pp65) has been identified as a source of immunodominant peptides and is regarded as a candidate for cytoimmunotherapy and vaccination. Two sequence homologs of ppUL83 are known for murine CMV, namely the virion protein ppM83 (pp105) expressed late in the viral replication cycle and the nonstructural protein pM84 (p65) expressed in the early phase. Here we show that ppM83, unlike ppUL83, is not delivered into the antigen presentation pathway after virus penetration before or in absence of viral gene expression, while other virion proteins of murine CMV are processed along this route. In cytokine secretion-based assays, ppM83 and pM84 appeared to barely contribute to the acute immune response and to immunological memory. Specifically, the frequencies of M83 and M84 peptide-specific CD8 T cells were low and undetectable, respectively. Nonetheless, in a murine model of cytoimmunotherapy of lethal CMV disease, M83 and M84 peptide-specific cytolytic T-cell lines proved to be highly efficient in resolving productive infection in multiple organs of cell transfer recipients. These findings demonstrate that proteins which fail to prime a quantitatively dominant immune response can nevertheless represent relevant antigens in the effector phase. We conclude that quantitative and qualitative immunodominance are not necessarily correlated. As a consequence of these findings, there is no longer a rationale for considering T-cell abundance as the key criterion for choosing specificities to be included in immunotherapy and immunoprophylaxis of CMV disease and of viral infections in general.

* Corresponding author. Mailing address: Institute for Virology, Johannes Gutenberg University, Hochhaus am Augustusplatz, 55101 Mainz, Germany. Phone: 49-6131-39-33650. Fax: 49-6131-39-35604. E-mail: Matthias.Reddehase{at}uni-mainz.de.

Journal of Virology, July 2001, p. 6584-6600, Vol. 75, No. 14
0022-538X/01/$04.00+0   DOI: 10.1128/JVI.75.14.6584-6600.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.


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