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Role of proteinase‐activated receptor‐2 in anti‐bacterial and immunomodulatory effects of interferon‐γ on human neutrophils and monocytes
Author(s) -
Shpacovitch Victoria M.,
Feld Micha,
Holzinger Dirk,
Kido Makiko,
Hollenberg Morley D.,
LeviSchaffer Francesca,
Vergnolle Nathalie,
Ludwig Stephan,
Roth Johannes,
Luger Thomas,
Steinhoff Martin
Publication year - 2011
Publication title -
immunology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.297
H-Index - 133
eISSN - 1365-2567
pISSN - 0019-2805
DOI - 10.1111/j.1365-2567.2011.03443.x
Subject(s) - agonist , innate immune system , secretion , phagocytosis , chemotaxis , biology , interferon , monocyte , microbiology and biotechnology , receptor , phagocyte , immune system , immunology , biochemistry
Summary Recent studies show that proteinase‐activated receptor‐2 (PAR 2 ) contributes to the development of inflammatory responses. However, investigations into the precise role of PAR 2 activation in the anti‐microbial defence of human leucocytes are just beginning. We therefore evaluated the contribution of PAR 2 to the anti‐microbial response of isolated human innate immune cells. We found that PAR 2 agonist, acting alone, enhances phagocytosis of Staphylococcus aureus and killing of Escherichia coli by human leucocytes, and that the magnitude of the effect is similar to that of interferon‐γ (IFN‐γ). However, co‐application of PAR 2 ‐cAP and IFN‐γ did not enhance the phagocytic and bacteria‐killing activity of leucocytes beyond that triggered by either agonist alone. On the other hand, IFN‐γ enhances PAR 2 agonist‐induced monocyte chemoattractant protein 1 (MCP‐1) secretion by human neutrophils and monocytes. Furthermore, phosphoinositide‐3 kinase and janus kinase molecules are involved in the synergistic effect of PAR 2 agonist and IFN‐γ on MCP‐1 secretion. Our findings suggest a potentially protective role of PAR 2 agonists in the anti‐microbial defence established by human monocytes and neutrophils.