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From the * Servicio de Inmunología, Hospital de la Princesa, Universidad Autónoma de Madrid,
E-28006, Madrid, Spain; and Leukocyte migration in response to cell attractant gradients or chemotaxis is a key phenomenon both in cell movement and in the inflammatory response. Chemokines are quite likely to
be the key molecules directing migration of leukocytes that involve cell polarization with generation of specialized cell compartments. The precise mechanism of leukocyte chemoattraction
is not known, however. In this study, we demonstrate that the CC chemokine receptors CCR2
and CCR5, but not cytokine receptors such as interleukin (IL)-2R
Department of Immunology and Oncology, Centro Nacional de
Biotecnología, Consejo Superior de Investigaciones Cientificas, Universidad Autónoma de Madrid,
Campus de Cantoblanco, E-28049 Madrid, Spain
, IL-2R
, tumor necrosis
factor receptor 1, or transforming growth factor
R, are redistributed to a pole in T cells that are migrating in response to chemokines. Immunofluorescence and confocal microscopy studies show that the chemokine receptors concentrate at the leading edge of the cell on the flattened cell-substratum contact area, induced specifically by the signals that trigger cell polarization. The redistribution of chemokine receptors is blocked by pertussis toxin and is dependent
on cell adhesion through integrin receptors, which mediate cell migration. Chemokine receptor expression on the leading edge of migrating polarized lymphocytes appears to act as a sensor
mechanism for the directed migration of leukocytes through a chemoattractant gradient.
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