The in vivo function of Th sell subsets is largely dependent on the ability of differentiated CD4+ T cells to be recruited to specific sites and secrete restricted sets of cytokines. In this paper we demonstrate that Th1 and Th2 cells secrete discrete patterns of chemokines, small m.w. cytokines that function as chemoattractants in inflammatory reactions. Th2 cells secrete and acquisition of this pattern of expression is dependent on Stat6. In contrast, Th1 cells secrete lymphotactin and RANTES, though unlike IFN-γ, expression of these chemokines is independent Stat4. We further show that supernatants from activated Th2 cells preferentially induce the chemotaxis of Th2 over Th1-cells, corresponding with Stat6-dependent expression of CCR4 and CCR8 in Th2 cells. These data provide the basis for restricted and direct T cell-mediated cellular recruitment to sites of inflammation.
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