期刊
BLOOD CELLS MOLECULES AND DISEASES
卷 55, 期 1, 页码 21-26出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.bcmd.2015.03.006
关键词
Extracellular signal-regulated kinase; Granulocyte-macrophage colony-stimulating factor; Interleukin-13; Neutrophil elastase; Protease-activated receptor-2
类别
资金
- Kumamoto Health Science University special fellowship [27-A-01]
Background: Granulocyte-macrophage colony-stimulating factor (GM-CSF) promotes classically activated M1 macrophages. GM-CSF upregulates protease-activated receptor-2 (PAR-2) protein expression and activation of PAR-2 by human neutrophil elastase (HNE) regulates cytokine production. Aim: This study investigated the mechanism of PAR-2-mediated interleukin (IL)-13 production by GM-CSF-dependent macrophages stimulated with HNE. Methods: Adherent macrophages were obtained from primary cultures of human mononuclear cells. After stimulation with HNE to activate the mitogen-activated protein kinase/extracellular signal-regulated kinase (MAPK/ERIC) signaling pathway, IL-13 mRNA and protein levels were assessed by the reverse transcriptase-polymerase chain reaction and enzyme-linked immunosorbent assay, respectively. Results: PAR-2 protein was detected in GM-CSF-dependent macrophages by Western blotting. Unexpectedly, PD98059 (an ERK1 inhibitor) increased IL-13 production, even at higher concentrations. Interestingly, U0126 (an ERK1/2 inhibitor) reduced IL-13 production in a concentration-dependent manner. Neither SB203580 (a p38alpha/p38beta inhibitor) nor BIRB796 (a p38gamma/p38delta inhibitor) affected IL-13 production, while TMB-8 (a calcium chelator) diminished IL-13 production. Discussion: Stimulation with HNE promoted the production of IL-13 (a Th2 cytokine) by GM-CSF-dependent M1 macrophages. PAR-2-mediated IL-13 production may be dependent on the Ca2+/ERK2 signaling pathway. (C) 2015 Elsevier Inc. All rights reserved.
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