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Laboratory of Immunology and Vascular Biology, Department of Pathology, Stanford University School of Medicine, Stanford, CA 94305; and Center for Molecular Biology and Medicine, Veterans Affairs Palo Alto Health Care System, Palo Alto, CA 94304
The germinal center (GC) is a pivotal site for the development of B
cell memory. Whereas GC B cells do not chemotax to most chemokines and
do not express the adhesion receptors L-selectin,
4
7, and cutaneous lymphocyte Ag (CLA),
memory B cells respond to various chemotactic signals and express
adhesion receptors. In this study, we show that CD40 ligand, IL-2, and
IL-10 together drive this transition of GC B cells to memory phenotype
in vitro, up-regulating memory B cell markers, chemotactic responses to
CXC ligand (CXCL)12, CXCL13, and CCL19, and expression of adhesion
receptors L-selectin,
4
7, and CLA.
Moreover, addition of IL-4 modulates this transition, preventing
chemotactic responses to CXCL12 and CXCL13 (but not to CCL19), and
inhibiting the re-expression of L-selectin, but not of CLA or
4
7. CCR7 expression, responsiveness to
CCL19, and L-selectin/
4
7 phenotype are
coordinately regulated. Thus, IL-2/IL-10 and IL-4 play important and
distinctive roles in developing the migratory capacities of memory B
cells.
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