Journal
NATURE IMMUNOLOGY
Volume 2, Issue 2, Pages 123-128Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/84219
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In contrast to the remarkable chemokine responses of phagocytes and monocytes that were documented early on, lymphocytes have been considered for a long time to be poor targets for chemokine action. This view has changed dramatically with the discovery that peripheral blood T cells need to be activated before they can migrate in response to inflammatory chemokines. These chemokines do not act on the bulk of resting T cells that are in circulation. The identification of a new group of chemokines that selects resting, as opposed to effector, T and B cells was very exciting. These inflammation-unrelated chemokines affect transendothelial migration and localization of progenitor and mature lymphocytes in lymphoid and nonlymphoid tissues. Here, we summarize the current view of chemokine-mediated lymphocyte traffic and focus on the molecular mechanisms by which T cell responses to chemokines are modulated. Recent developments in this area justify the hypothesis that the distinct migration patterns of lymphocytes throughout their life cycle-that is, during lymphopoiesis, antigen-dependent priming, inflammation and immune surveillance-are finely tuned by changing sets of chemokines that are selective for developmentally regulated chemokine receptors. Thus, the chemokine system assures that cell traffic during inflammatory responses occurs in the proper spatial and temporal fashion and disturbance of this system, therefore, can lead to inflammatory disease.
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