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The cellular promyelocytic leukemia protein (PML) associates with the proteins of several viruses and in some cases reduces viral propagation in cell culture. To examine the role of PML in vivo, we compared immune responses and virus loads of PML-deficient and control mice infected with lymphocytic choriomeningitis virus (LCMV) and vesicular stomatitis virus (VSV). PML(-/-) mice exhibited accelerated primary footpad swelling reactions to very-low-dose LCMV, higher swelling peaks upon high-dose inoculation, and higher viral loads in the early phase of systemic LCMV infection. T-cell-mediated hepatitis and consequent mortality upon infection with a hepatotropic LCMV strain required 10- to 100-times-lower inocula despite normal cytotoxic T-lymphocyte reactivity in PML(-/-) mice. Furthermore, PML deficiency rendered mice 10 times more susceptible to lethal immunopathology upon intracerebral LCMV inoculation. Accordingly, 10-times-lower VSV inocula elicited specific neutralizing-antibody responses, a replication-based effect not observed with inactivated virus or after immunization with recombinant VSV glycoprotein. These in vivo observations corroborated our results showing more virus production in PML(-/-) fibroblasts. Thus, PML is a contributor to innate immunity, defining host susceptibility to viral infections and to immunopathology.

Type

Journal article

Journal

J Virol

Publication Date

04/2002

Volume

76

Pages

3810 - 3818

Keywords

Animals, Antibodies, Viral, Arenaviridae Infections, Cells, Cultured, Fibroblasts, Humans, Lymphocytic choriomeningitis virus, Mice, Neoplasm Proteins, Neutralization Tests, Nuclear Proteins, Promyelocytic Leukemia Protein, Rhabdoviridae Infections, T-Lymphocytes, Cytotoxic, Transcription Factors, Tumor Suppressor Proteins, Vesicular stomatitis Indiana virus, Virus Replication