Immunosuppression and Resultant Viral Persistence by Specific Viral Targeting of Dendritic Cells

Among cells of the immune system, CD11c+ and DEC-205+ splenic dendritic cells primarily express the cellular receptor (α-dystroglycan [α-DG]) for lymphocytic choriomeningitis virus (LCMV). By selection, strains and variants of LCMV that bind α-DG with high affinity are associated with virus replication in the white pulp, show preferential replication in a majority of CD11c+ and DEC-205+ cells, cause immunosuppression, and establish a persistent infection. In contrast, viral strains and variants that bind with low affinity to α-DG are associated with viral replication in the red pulp, display minimal replication in CD11c+ and DEC-205+ cells, and generate a robust anti-LCMV cytotoxic T lymphocyte response that clears the virus infection. Differences in binding affinities can be mapped to a single amino acid change in the viral glycoprotein 1 ligand that binds to α-DG. These findings indicate that receptor–virus interaction on dendritic cells in vivo can be an essential step in the initiation of virus-induced immunosuppression and viral persistence.

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