title: TLR4 ligation induces expression of APRIL molecule in human neutrophils - a preliminary study.
abstract: In the present study we investigate the consequences of TLR4 activation by LPS for the synthesis of a proliferation-inducing ligand (APRIL) by human neutrophils (PMNs), and the possible role of the ERK1/2 kinases signaling pathway. In order to make a comparison, the same examinations were carried out on autologous peripheral blood mononuclear cells (PBMCs). The levels of mRNA for APRIL and TLR4 were measured using the real-time PCR method. Western blot analysis was used to assay the expressions of APRIL and ERK1/2 in cell lysates. We discovered an increased expression of APRIL accompanying the increased expression of TLR4 in the LPS-stimulated PMNs and PBMCs. Furthermore, stimulation with LPS triggered similar changes in phospho-ERK1/2 proteins expression in those cells. The present study suggests that LPS plays a role in TLR4-ligation in APRIL induction through ERK1/2 pathway activation in human neutrophils and mononuclear cells of peripheral blood. The association between TLR4 activation and APRIL expression in examined leukocytes might have important implications for the immune response of the host exposed to TLR4 ligands such as LPS.
authors: Department of Immunology, Medical University of Bialystok, Poland. ewa.jablonska@umwb.edu.pl
authors: Ewa
authors: E
authors: Jabłońska
authors: Natalia
authors: N
authors: Wawrusiewicz-Kurylonek
authors: Marzena
authors: M
authors: Garley
authors: Adam
authors: A
authors: Krętowski
mesh_terms: D015153:Blotting, Western; D048049:Extracellular Signal-Regulated MAP Kinases / Q000378:metabolism; D005786:Gene Expression Regulation / Q000187:drug effects; D006801:Humans; D008070:Lipopolysaccharides / Q000494:pharmacology; D009504:Neutrophils / Q000187:drug effects / Q000378:metabolism*; D010766:Phosphorylation / Q000187:drug effects; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D060888:Real-Time Polymerase Chain Reaction; D051197:Toll-Like Receptor 4 / Q000235:genetics / Q000378:metabolism*; D053300:Tumor Necrosis Factor Ligand Superfamily Member 13 / Q000235:genetics / Q000378:metabolism*
chemical_list: D008070:Lipopolysaccharides; D012333:RNA, Messenger; C495345:TLR4 protein, human; D051197:Toll-Like Receptor 4; D053300:Tumor Necrosis Factor Ligand Superfamily Member 13; D048049:Extracellular Signal-Regulated MAP Kinases