Signaling through CD43 induces natural killer cell activation, chemokine release, and PYK-2 activation.
Natural killer (NK) cell activation is the result of a balance between positive and negative signals triggered by specific membrane receptors. We report here the activation of NK cells induced through the transmembrane glycoprotein CD43 (leukosialin, sialophorin). Engagement of CD43 by specific antibodies stimulated the secretion of the chemokines RANTES, macrophage inflammatory protein (MIP)-1alpha, and MIP-1beta, which was prevented by treatment of cells with the specific tyrosine kinase inhibitor genistein. Furthermore, signaling through CD43 increased the cytotoxic activity of NK cells and stimulated an increase in the tyrosine kinase activity in antiphosphotyrosine immune complexes of NK cell lysates. PYK-2 was identified among the tyrosine kinase proteins that become activated. Hence, PYK-2 activation was observed after 20 minutes of CD43 stimulation, reached a maximum after 45 to 60 minutes, and decreased to almost basal levels after 120 minutes of treatment. Together, these results demonstrate the role of CD43 as an activation molecule able to transduce positive activation signals in NK cells, including the regulation of chemokine synthesis, killing activity, and tyrosine kinase activation.
Nieto
M
M
Servicio de Inmunología, Hospital de la Princesa, Universidad Autónoma de Madrid, Madrid, Spain.
Rodríguez-Fernández
J L
JL
Navarro
F
F
Sancho
D
D
Frade
J M
JM
Mellado
M
M
Martínez-A
C
C
Cabañas
C
C
Sánchez-Madrid
F
F
D015703:Antigens, CD; D002478:Cells, Cultured; D054405:Chemokine CCL3; D054407:Chemokine CCL4; D018946:Chemokine CCL5 / Q000378:metabolism; D018925:Chemokines / Q000378:metabolism*; D003602:Cytotoxicity, Immunologic / Q000187:drug effects; D004789:Enzyme Activation / Q000187:drug effects; D004791:Enzyme Inhibitors / Q000494:pharmacology; D051418:Focal Adhesion Kinase 2; D019833:Genistein / Q000494:pharmacology; D006801:Humans; D007376:Interleukin-2 / Q000494:pharmacology; D007694:Killer Cells, Natural / Q000276:immunology*; D051917:Leukosialin; D019402:Macrophage Inflammatory Proteins / Q000378:metabolism; D010766:Phosphorylation; D011499:Protein Processing, Post-Translational; D011505:Protein-Tyrosine Kinases / Q000037:antagonists & inhibitors / Q000378:metabolism* / Q000502:physiology; D012795:Sialoglycoproteins / Q000502:physiology*; D015398:Signal Transduction
D015703:Antigens, CD; D054405:Chemokine CCL3; D054407:Chemokine CCL4; D018946:Chemokine CCL5; D018925:Chemokines; D004791:Enzyme Inhibitors; D007376:Interleukin-2; D051917:Leukosialin; D019402:Macrophage Inflammatory Proteins; C465014:SPN protein, human; D012795:Sialoglycoproteins; D019833:Genistein; D011505:Protein-Tyrosine Kinases; D051418:Focal Adhesion Kinase 2