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Tyrosine kinase Btk regulates E-selectin-mediated integrin activation andneutrophil recruitment by controlling phospholipase C (PLC) gamma2 and PI3Kgamma pathways

Articolo
Data di Pubblicazione:
2010
Abstract:
Selectins mediate leukocyte rolling, trigger beta(2)-integrin activation, and promote leukocyte recruitment into inflamed tissue. E-selectin binding to P-selectin glycoprotein ligand 1 (PSGL-1) leads to activation of an immunoreceptor tyrosine-based activation motif (ITAM)-dependent pathway, which in turn activates the spleen tyrosine kinase (Syk). However, the signaling pathway linking Syk to integrin activation after E-selectin engagement is unknown. To identify the pathway, we used different gene-deficient mice in autoperfused flow chamber, intravital microscopy, peritonitis, and biochemical studies. We report here that the signaling pathway downstream of Syk divides into a phospholipase C (PLC) gamma2- and phosphoinositide 3-kinase (PI3K) gamma-dependent pathway. The Tec family kinase Bruton tyrosine kinase (Btk) is required for activating both pathways, generating inositol-3,4,5-trisphosphate (IP(3)), and inducing E-selectin-mediated slow rolling. Inhibition of this signal-transduction pathway diminished Galpha(i)-independent leukocyte adhesion to and transmigration through endothelial cells in inflamed postcapillary venules of the cremaster. Galpha(i)-independent neutrophil recruitment into the inflamed peritoneal cavity was reduced in Btk(-/-) and Plcg2(-/-) mice. Our data demonstrate the functional importance of this newly identified signaling pathway mediated by E-selectin engagement
Tipologia CRIS:
03A-Articolo su Rivista
Keywords:
cell migration; Syk; PI3K
Elenco autori:
Mueller H; Stadtmann A; Van Aken H; Hirsch E; Wang D; Ley K; Zarbock A
Autori di Ateneo:
HIRSCH Emilio
Link alla scheda completa:
https://iris.unito.it/handle/2318/73894
Pubblicato in:
BLOOD
Journal
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URL

http://bloodjournal.hematologylibrary.org/cgi/reprint/115/15/3118
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