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1 Department of Dermatology, University Hospital Erlangen, Hartmannstrasse 14, D-91052 Erlangen, Germany
2 Department of Immunology and Molecular Pathology, University College London, London W1P 6DB, UK
3 BioVex Ltd, Oxford OX14 4RX, UK
4 Max Delbruck Center for Molecular Medicine, MDC, Robert-Rossle-Str. 10, 13092 Berlin, Germany
5 Institute for Biomedical Technology, Department of Cell Biology, University Hospital Aachen, Aachen, Germany
Correspondence
Alexander T. Prechtel
alexander.prechtel{at}derma.imed.uni-erlangen.de
Herpes simplex virus type 1 (HSV-1) is able to establish latency in infected individuals. In order to characterize potential new immune-escape mechanisms, mature dendritic cells (DCs) were infected with HSV-1 and total cellular RNA was isolated from infected and mock-infected populations at different time points. RNA profiling on Affymetrix Human Genome U133A arrays demonstrated a dramatic downregulation of the migration-mediating surface molecules CCR7 and CXCR4, an observation that was further confirmed by RT-PCR and fluorescence-activated cell sorting analyses. Furthermore, migration assays revealed that, upon infection of mature DCs, CCR7- and CXCR4-mediated migration towards the corresponding CCL19 and CXCL12 chemokine gradients was strongly reduced. It is noteworthy that the infection of immature DCs with HSV-1 prior to maturation led to a failure of CCR7 and CXCR4 upregulation during DC maturation and, as a consequence, also induced a block in their migratory capacity. Additional migration assays with a 
vhs mutant virus lacking the virion host shutoff (vhs) gene, which is known to degrade cellular mRNAs, suggested a vhs-independent mechanism. These results indicate that HSV-1-infected mature DCs are limited in their capacity to migrate to secondary lymphoid organs, the areas of antigen presentation and T-cell stimulation, thus inhibiting an antiviral immune response. This represents a novel, previously unrecognized mechanism for HSV-1 to escape the human immune system.
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