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) Mutant Mice
By


From the * Institute of Experimental Immunology, Department of Pathology, University Hospital of
Zürich, 8091 Zürich, Switzerland; The role of the spleen and of other organized secondary lymphoid organs for the induction of
protective antiviral immune responses was evaluated in orphan homeobox gene 11 knockout
mice (Hox11
Laboratory for Special Techniques, Department of Pathology,
University of Zürich, 8091 Zürich, Switzerland; § Howard Hughes Medical Institute and
Departments of Medicine and Pathology, Washington University School of Medicine, St. Louis,
Missouri 63110; and
Molecular Biology Department, Research Laboratories, Nippon Shinyaku Co.,
Ltd., Nishioji-Hachijo, Minami-ku, Kyoto 601, Japan
/
) lacking the spleen, and in homozygous alymphoplastic mutant mice (aly/aly)
possessing a structurally altered spleen but lacking lymph nodes and Peyer's patches. Absence of
the spleen had no major effects on the immune response, other than delaying the antibody response by 1-2 d. In aly/aly mice, the thymus-independent IgM response against vesicular stomatitis virus (VSV) was delayed and reduced, whereas the T-dependent switch to the protective IgG was absent. Therefore, aly/aly mice were highly susceptible to VSV infection. Since
aly/aly spleen cells yielded neutralizing IgM and IgG after adoptive transfer into recipients with
normally structured secondary lymphoid organs, these data suggest that the structural defect
was mainly responsible for inefficient T-B cooperation. Although aly/aly mice generated detectable, but reduced, CTL responses after infection with vaccinia virus (VV) and lymphocytic choriomeningitis virus (LCMV), the elimination of these viruses was either delayed (VV) or
virtually impossible (LCMV); irrespective of the dose or the route of infection, aly/aly mice
developed life-long LCMV persistence. These results document the critical role of organized
secondary lymphoid organs in the induction of naive T and B cells. These structures also provide the basis for cooperative interactions between antigen-presenting cells, T cells, and B cells,
which are a prerequisite for recovery from primary virus infections via skin or via blood.
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