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Department of Pathology, Harvard Medical School, Boston, MA 02115.
Mice bearing a disrupted C3 locus (C3-/-) have an
impaired Ab response to T-dependent Ags (bacteriophage
X 174 and
nuclear protein-keyhole limpet hemocyanin) characterized by a reduction
in number and size of germinal centers and impaired retention of Ag by
follicular dendritic cells. To test the importance of C3 synthesized
locally within the lymphoid compartment during an immune response to
T-dependent Ag, we reconstituted C3-/- mice with
wild-type bone marrow of MHC-identical littermates. Engraftment not
only restored local C3 synthesis in the spleen, but also rescued the
impaired humoral response. The major source of C3 mRNA was
MOMA-2+ macrophages localized within the white pulp areas
of the spleen. Interestingly, C3 expression is apparently regulated as
C3 mRNA was not detected in splenic sections of nonimmune mice.
Furthermore, local C3 synthesis by donor macrophages reversed the
impaired Ag trapping by splenic follicular dendritic cells in
C3-deficient mice.
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