Agonists of proteinase‐activated receptor‐2 affect transendothelial migration and apoptosis of human neutrophils

VM Shpacovitch, S Seeliger… - Experimental …, 2007 - Wiley Online Library
VM Shpacovitch, S Seeliger, M Huber‐Lang, S Balkow, M Feld, MD Hollenberg, VJ Sarma…
Experimental dermatology, 2007Wiley Online Library
Skin is the first barrier preventing microorganism invasion in host. Wounds destroy this
defense barrier and, without an appropriate care, may lead to sepsis. Neutrophil activation
and immigration plays an important role at the inflammatory stage of wound healing.
Neutrophils are known to express proteinase‐activated receptors (PARs), which can be
activated by serine proteases, also by enzymes involved in wound healing. We previously
reported that PAR2 agonists up‐regulate cell adhesion molecule expression and cytokine …
Abstract:  Skin is the first barrier preventing microorganism invasion in host. Wounds destroy this defense barrier and, without an appropriate care, may lead to sepsis. Neutrophil activation and immigration plays an important role at the inflammatory stage of wound healing. Neutrophils are known to express proteinase‐activated receptors (PARs), which can be activated by serine proteases, also by enzymes involved in wound healing. We previously reported that PAR2 agonists up‐regulate cell adhesion molecule expression and cytokine production by human neutrophils. Here, we demonstrate that PAR2 agonists (serine proteases as well as synthetic peptides) reduce transendothelial migration of neutrophils and prolong their life in vitro. Synthetic PAR2 agonist also enhanced protective interferon (IFN)γ‐induced FcγRI expression at neutrophil cell surface. Of note, IFNγ is a cytokine, which was used in clinical trials to reactivate human neutrophil functions during sepsis. Moreover, we observed a significant increase of PAR2 expression on cell surface of neutrophils from septic patients as compared with healthy volunteers. Together, our results indicate that PAR2 may be involved in the pathophysiology of neutrophil‐endothelial interactions during wound healing or later during sepsis in humans, potentially by affecting neutrophil apoptosis, transendothelial migration and Fcγ receptor‐mediated phagocytosis.
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