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The Journal of Immunology, 2000, 164: 4481-4492.
Copyright © 2000 by The American Association of Immunologists

Astrocyte-Targeted Expression of IL-12 Induces Active Cellular Immune Responses in the Central Nervous System and Modulates Experimental Allergic Encephalomyelitis1

Axel Pagenstecher2,3,*, Silke Lassmann2,*, Monica J. Carson{dagger}, Carrie L. Kincaid*, Anna K. Stalder* and Iain L. Campbell4,*

Departments of * Neuropharmacology and {dagger} Molecular Biology, The Scripps Research Institute, La Jolla, CA 92037

The role of IL-12 in the evolution of immunoinflammatory responses at a localized tissue level was investigated. Transgenic mice were developed with expression of either both the IL-12 subunits (p35 and p40) or only the IL-12 p40 subunit genes targeted to astrocytes in the mouse CNS. Glial fibrillary acidic protein (GF)-IL-12 mice, bigenic for the p35 and p40 genes, developed neurologic disease which correlated with the levels and sites of transgene-encoded IL-12 expression. In these mice, the brain contained numerous perivascular and parenchymal inflammatory lesions consisting of predominantly CD4+ and CD8+ T cells as well as NK cells. The majority of the infiltrating T cells had an activated phenotype (CD44high, CD45Rblow, CD62Llow, CD69high, VLA-4 high, and CD25+). Functional activation of the cellular immune response was also evident with marked cerebral expression of the IFN-{gamma}, TNF, and IL-1{alpha}ß genes. Concomitant with leukocyte infiltration, the CNS expression of immune accessory molecules was induced or up-regulated, including ICAM-1, VCAM-1, and MHC class II and B7-2. Glial fibrillary acidic protein-p40 mice with expression of IL-12 p40 alone remained asymptomatic, with no inflammation evident at any age studied. The effect of local CNS production of IL-12 in the development of experimental autoimmune encephalomyelitis was studied. After immunization with myelin oligodendrocyte glycoprotein-peptides, GF-IL-12 mice had an earlier onset and higher incidence but not more severe disease. We conclude that localized expression of IL-12 by astrocytes can 1) promote the spontaneous development of activated type 1 T cell and NK cellular immunity and cytokine responses in the CNS, and 2) promote more effective Ag-specific T cell dynamics but not activity in experimental autoimmune encephalomyelitis.




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