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Src family kinases mediate neutrophil adhesion to adherent platelets

Virgilio Evangelista1, Zehra Pamuklar, Antonio Piccoli

  • 1Laboratory of Vascular Biology and Pharmacology, Consorzio Mario Negri Sud, Via Nazionale 8/A, 66030 Santa Maria Imbaro, Italy. evangelista@negrisud.it

Blood
|November 11, 2006
PubMed

Insights

Src-family kinases (SFKs) are crucial for polymorphonuclear leukocyte (PMN) recruitment to activated platelets at vascular injury sites. Inhibiting SFKs may offer novel therapeutic targets for vascular diseases.

Area of Science:

  • Immunology
  • Vascular Biology
  • Cellular Signaling

Background:

  • Polymorphonuclear leukocyte (PMN)-platelet interactions drive inflammation at vascular damage sites.
  • Understanding the molecular mechanisms regulating these interactions is key to addressing vascular diseases.

Purpose of the Study:

  • To investigate the role of "outside-in" signaling by Src-family tyrosine kinases (SFKs) in regulating alphaMbeta2-integrin-dependent PMN recruitment by activated platelets.

Main Methods:

  • Utilized genetic deletion (alphaMbeta2(-/-), hck(-/-)fgr(-/-), hck(-/-)fgr(-/-)lyn(-/-) mice) and pharmacological inhibition of SFKs and Pyk2.
  • Analyzed PMN-platelet adhesion in suspension and under flow conditions.
  • Assessed PMN accumulation in vivo at sites of vascular injury.

Main Results:

  • SFK inhibition abolished activation-dependent beta2 integrin epitopes and impaired PMN adhesion to platelets.
  • SFK signaling is essential for alphaMbeta2-mediated shear-resistant PMN adhesion to platelets, but not for P-selectin-PSGL-1 interactions.
  • Pyk2 phosphorylation accompanied PMN adhesion and was reduced by SFK inhibition, suggesting Pyk2 is a downstream effector.
  • SFK activity was required for PMN accumulation at vascular injury sites in vivo.

Conclusions:

  • Src-family kinases play a critical role in alphaMbeta2-integrin-mediated PMN recruitment by activated platelets.
  • SFKs are essential for shear-resistant PMN adhesion and accumulation at sites of vascular injury.
  • Targeting SFKs presents a potential therapeutic strategy for mitigating adverse platelet-leukocyte interactions in vascular disease.

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