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J. Exp. Med.,
Volume 188, Number 1, July 1, 1998 181-191
By
From the Department of Microbiology and Immunology, University of California at San Francisco, San
Francisco, California 94143-0414
Movement of T and B lymphocytes through secondary lymphoid tissues is likely to involve
multiple cues that help the cells navigate to appropriate compartments. Epstein-Barr virus-
induced molecule 1 (EBI-1) ligand chemokine (ELC/MIP3
) is expressed constitutively within lymphoid tissues and may act as such a guidance cue. Here, we have isolated mouse
ELC and characterized its expression pattern and chemotactic properties. ELC is expressed
constitutively in dendritic cells within the T cell zone of secondary lymphoid tissues. Recombinant ELC was strongly chemotactic for naive (L-selectinhi) CD4 T cells and for CD8 T cells
and weakly attractive for resting B cells and memory (L-selectinlo) CD4 T cells. After activation
through the B cell receptor, the chemotactic response of B cells was enhanced. Like its human
counterpart, murine ELC stimulated cells transfected with EBI-1/CC chemokine receptor 7 (CCR7). Our findings suggest a central role for ELC in promoting encounters between recirculating T cells and dendritic cells and in the migration of activated B cells into the T zone of
secondary lymphoid tissues.
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