Abstract
Therapy of cytomegalovirus (CMV) infection in recipients of hematopoietic stem cell transplantation (HSCT) by immune serum transfer did not fulfill the high clinical expectations, although immune sera or immunoglobulin-enriched preparations pooled from many CMV-immune donors are likely to contain virus neutralizing antibodies covering a broad range of virus variants. Likewise, the highest risk of CMV disease in HSCT recipients results from the reactivation of the latently infected recipient’s own virus despite pre-transplantation humoral immunity. These findings suggest the conclusion that antiviral antibodies are inefficient in controlling CMV. Rather than B cells and antibodies, T cells, in particular CD8 T cells, are thought to play a major role in resolving established organ infection. In theory, antibodies, though being capable of neutralizing free virions, could fail to prevent cell-bound virus dissemination from the portal of entry to distant target tissues and also could fail in preventing cell-to-cell spread within tissue. Here we have used murine model systems, including B cell deficient C57BL/6 μ− μ− (μMT) mutants, to revisit the role of antiviral antibodies in the control of CMV infection and to reevaluate the prospects of an antibody-based immunotherapy from a basic science point of view.
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Acknowledgments
We greatly appreciate the help by Stipan Jonjić (Department of Histology and Embryology, Faculty of Medicine, University of Rijeka, Croatia) who generously supplied us with immune sera and monoclonal antibodies. This work is part of the MD thesis of the first author N.W. Support was provided by the Deutsche Forschungsgemeinschaft, SFB 490, individual projects E2 (C.O.S. and M.J.R.), E4 (M.J.R.) and E3 (R.H. and S.I.S.), SFB 432, individual project A10 (J.P.) and Clinical Research Group KFO 183, individual project TP8 “Establishment of a challenge model to optimize the immunotherapy of cytomegalovirus diseases” (M.J.R. and N.A.W.L). Special thanks go to the “Dr. Gerhard und Martha Röttger-Stiftung” for a generous donation.
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Wirtz, N., Schader, S.I., Holtappels, R. et al. Polyclonal cytomegalovirus-specific antibodies not only prevent virus dissemination from the portal of entry but also inhibit focal virus spread within target tissues. Med Microbiol Immunol 197, 151–158 (2008). https://doi.org/10.1007/s00430-008-0095-0
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DOI: https://doi.org/10.1007/s00430-008-0095-0