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J. Cell Biol.,
Volume 144, Number 4, February 22, 1999 755-765


* Department of Immunology and Oncology, Centro Nacional de Biotecnología, CSIC/UAM, Campus de Cantoblanco, E-28049
Madrid, Spain; Chemokines are a family of proinflammatory
cytokines that attract and activate specific types of leukocytes. Chemokines mediate their effects via interaction with seven transmembrane G protein-coupled receptors (GPCR). Using CCR5-transfected HEK-293
cells, we show that both the CCR5 ligand, RANTES, as
well as its derivative, aminooxypentane (AOP)-
RANTES, trigger immediate responses such as Ca2+
influx, receptor dimerization, tyrosine phosphorylation,
and G
Servicio de Inmunología, Hospital de la Princesa, Universidad Autónoma de Madrid, Diego de León 62, E-28006 Madrid, Spain; and § Serono Pharmaceutical Research Institute, Plan-les-Ouates, Geneva CH-1228, Switzerland
i as well as JAK/STAT association to the receptor. In contrast to RANTES, (AOP)-RANTES is unable to trigger late responses, as measured by the
association of focal adhesion kinase (FAK) to the
chemokine receptor complex, impaired cell polarization required for migration, or chemotaxis. The results
are discussed in the context of the dissociation of the
late signals, provoked by the chemokines required for
cell migration, from early signals.
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