title: RANTES-induced T cell activation correlates with CD3 expression.
abstract: The chemokine RANTES induces a unique biphasic cytoplasmic Ca2+ signal in T cells. The first phase of this signal, similar to that of other chemokines, is G-protein mediated and chemotaxis associated. The second phase of this signal, unique to RANTES and evident at concentrations greater than 100 nM, is tyrosine kinase linked and results in a spectrum of responses similar to those seen with antigenic stimulation of T cells. We show here that certain jurkat T cells responded to RANTES solely through this latter pathway. A direct correlation between the RANTES-induced second phase response and CD3 expression was demonstrated in these cells. Sorting the Jurkat cells into CD3(high) and CD3(low) populations revealed that only the CD3(high) cells were responsive to RANTES. Furthermore, stimulation of these Jurkat cells with anti-CD3 mAb significantly depresses their subsequent response to RANTES. While a RANTES-specific chemokine receptor is expressed at a low level on these Jurkat cells, the RANTES-induced activation is dependent on the presence of the TCR. Thus, stimulation through TCR may partially account for RANTES' unique pattern of signaling in T cells.
authors.affiliation: Department of Immunology, DNAX Research Institute of Molecular and Cellular Biology, Palo Alto, CA 94306, USA.
authors.forename: D J
authors.initials: DJ
authors.lastname: Dairaghi
authors.forename: K S
authors.initials: KS
authors.lastname: Soo
authors.forename: E R
authors.initials: ER
authors.lastname: Oldham
authors.forename: B A
authors.initials: BA
authors.lastname: Premack
authors.forename: T
authors.initials: T
authors.lastname: Kitamura
authors.forename: K B
authors.initials: KB
authors.lastname: Bacon
authors.forename: T J
authors.initials: TJ
authors.lastname: Schall
mesh_terms: D016227:Benzoquinones; D017252:CD3 Complex / Q000502:physiology*; D002118:Calcium / Q000502:physiology; D018946:Chemokine CCL5 / Q000502:physiology*; D015536:Down-Regulation; D004791:Enzyme Inhibitors / Q000494:pharmacology; D019204:GTP-Binding Proteins / Q000037:antagonists & inhibitors / Q000502:physiology; D006801:Humans; D019169:Jurkat Cells / Q000502:physiology*; D047029:Lactams, Macrocyclic; D008213:Lymphocyte Activation; D011505:Protein-Tyrosine Kinases / Q000502:physiology; D011809:Quinones / Q000494:pharmacology; D017828:Rifabutin / Q000031:analogs & derivatives; D015398:Signal Transduction / Q000187:drug effects; D013601:T-Lymphocytes / Q000502:physiology*; D010566:Virulence Factors, Bordetella / Q000494:pharmacology
chemical_list: D016227:Benzoquinones; D017252:CD3 Complex; D018946:Chemokine CCL5; D004791:Enzyme Inhibitors; D047029:Lactams, Macrocyclic; D011809:Quinones; D010566:Virulence Factors, Bordetella; D017828:Rifabutin; C020754:herbimycin; D011505:Protein-Tyrosine Kinases; D019204:GTP-Binding Proteins; D002118:Calcium