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J. Exp. Med.,
Volume 187, Number 7, April 6, 1998 1009-1018
-dependent Fashion
By

§
From the * Department of Laboratory Medicine/Pathology, the Lymphotoxin (LT)
Department of Internal Medicine, and
the § Howard Hughes Medical Institute and Center for Immunology, Washington University School of
Medicine, St. Louis, Missouri 63110
is expressed by activated T cells, especially CD4+ T helper type 1 cells,
and by activated B and natural killer cells, but the functions of this molecule in vivo are incompletely defined. We have previously shown that follicular dendritic cell (FDC) clusters and germinal centers (GCs) are absent from the peripheral lymphoid tissues of LT
-deficient (LT
/
)
mice. LT
/
mice produce high levels of antigen-specific immunoglobulin (Ig)M, but very
low levels of IgG after immunization with sheep red blood cells. We show here that LT
-expressing B cells are essential for the recovery of primary, secondary, and memory humoral
immune responses in LT
/
mice. It is not necessary for T cells to express LT
to support these immune functions. Importantly, LT
-expressing B cells alone are essential and sufficient
for the formation of FDC clusters. Once these clusters are formed by LT
-expressing B cells,
then LT
-deficient T cells can interact with B cells to generate GCs and productive class-switched antibody responses. Thus, B cells themselves provide an essential signal that induces
and maintains the lymphoid microenvironment essential for GC formation and class-switched Ig responses.
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