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*
Department of Immunology and
Howard Hughes Medical Institute, University of Washington, Seattle WA 98195
Chemokines are likely to play an important role in regulating the
trafficking of developing T cells within the thymus. By using
anti-CD3
treatment of recombinase-activating gene 2
(Rag2-/-) mice to mimic pre-TCR signaling and drive
thymocyte development to the double positive stage, we have identified
murine GPR-9-6 as a chemokine receptor whose expression is strongly
induced following pre-TCR signaling. GPR-9-6 mRNA is present at high
levels in the thymus, and by RT-PCR analysis its expression is induced
as normal thymocytes undergo the double negative to double positive
transition. Furthermore we show that TECK (thymus-expressed chemokine),
a chemokine produced by thymic medullary dendritic cells, is a
functional ligand for GPR-9-6. TECK specifically induces a calcium flux
and chemotaxis of GPR-9-6-transfected cells. In addition, TECK
stimulates the migration of normal double positive thymocytes, as well
as Rag2-/- thymocytes following anti-CD3
treatment. Hence, GPR-9-6 has been designated as CC chemokine receptor
9 (CCR9). Our results suggest that TECK delivers signals through CCR9
important for the navigation of developing thymocytes.
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