Journal
IMMUNITY
Volume 22, Issue 2, Pages 235-246Publisher
CELL PRESS
DOI: 10.1016/j.immuni.2005.01.004
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- NIDDK NIH HHS [DK58066] Funding Source: Medline
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In classical descriptions of leukocyte chemokine signaling, Src family kinases are thought to function in a positive fashion by coupling receptor associated Galpha subunits to downstream mitogen activated protein (MAP) kinase activation. However, neutrophils derived from hck(-/-)fgr(-/-) mice and dendritic cells (DCs) from fgr(-/-) animals manifested significantly higher intracellular signaling (Ca2+ flux, MAP kinase activation, actin polymerization) and functional responses (chemotaxis in vitro and migration in vivo) to a number of different chemokines. These kinases may mediate their effect through the inhibitory receptor PIR-B since neutrophils and DCs from pir-b(-/-) mice were also hyperresponsive to chemokine stimulation. In wild-type (wt) cells dephosphorylation of PIR-B was associated with maximal chemokine signaling, whereas in hck(-/-)fgr(-/-) cells PIR-B was unphosphorylated. These data support a model in which the Src family kinases Hck and Fgr function as negative regulators of myeloid cell chemokine signaling by maintaining the tonic phosphorylation of PIR-B.
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