title: Characterization of the impairment of the uptake of apoptotic polymorphonuclear cells by monocyte subpopulations in systemic lupus erythematosus.
abstract: Efficient removal of apoptotic polymorphonuclear leukocytes (PMNs) is an important step in the resolution of inflammation, which protects tissues from the noxious contents of dying cells. While the impairment of apoptotic PMNs removal has been demonstrated for macrophages in systemic lupus erythematosus (SLE), recent studies show that monocytes are also capable of such phagocytosis, although their involvement in SLE is not clear. Therefore, we characterized phagocytosis of apoptotic PMNs by monocytes in 22 patients with SLE and 22 healthy controls. Using flow cytometry we demonstrate that in SLE peripheral blood monocytes show impaired phagocytosis of autologous apoptotic PMNs, while they efficiently engulf apoptotic PMNs isolated from healthy subjects. Monocytes CD14highCD16+ and CD14dimCD16+ more efficiently interacted with apoptotic neutrophils than CD16- cells both in SLE and healthy subjects. Monocytes in SLE showed modestly decreased expression of CD35 and CD91 and increased expression of T Cell Ig- and mucin-domain-containing molecule-3 (TIM-3); however, these differences were evident mainly in selected subsets of monocytes (CD16+) while defects in phagocytosis were observed in all monocyte subsets. Apoptotic cell-dependent induction of lipopolysaccharide (LPS) stimulated production of anti-inflammatory cytokine IL-10 by peripheral blood mononuclear cells (PBMC) was blunted in SLE while the production of pro-inflammatory cytokine TNF-α was unchanged.
authors: Translational Medicine Laboratory, Department of Internal Medicine, Jagiellonian University School of Medicine, Cracow, Poland tomaszp.mikolajczyk@uj.edu.pl.
authors: T P
authors: TP
authors: Mikołajczyk
authors: Translational Medicine Laboratory, Department of Internal Medicine, Jagiellonian University School of Medicine, Cracow, Poland.
authors: D
authors: D
authors: Skiba
authors: Division of Rheumatology, Jagiellonian University School of Medicine, Cracow, Poland.
authors: B
authors: B
authors: Batko
authors: Division of Rheumatology, Jagiellonian University School of Medicine, Cracow, Poland.
authors: M
authors: M
authors: Krezelok
authors: Translational Medicine Laboratory, Department of Internal Medicine, Jagiellonian University School of Medicine, Cracow, Poland.
authors: G
authors: G
authors: Wilk
authors: Translational Medicine Laboratory, Department of Internal Medicine, Jagiellonian University School of Medicine, Cracow, Poland.
authors: G
authors: G
authors: Osmenda
authors: Department of Immunology, Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, Cracow, Poland.
authors: J R
authors: JR
authors: Pryjma
authors: Translational Medicine Laboratory, Department of Internal Medicine, Jagiellonian University School of Medicine, Cracow, Poland Institute of Cardiovascular and Medical Sciences, University of Glasgow, UK.
authors: T J
authors: TJ
authors: Guzik
mesh_terms: D000328:Adult; D015703:Antigens, CD / Q000032:analysis*; D017209:Apoptosis; D016022:Case-Control Studies; D005260:Female; D000072597:Hepatitis A Virus Cellular Receptor 2; D006801:Humans; D016753:Interleukin-10 / Q000096:biosynthesis; D007963:Leukocytes, Mononuclear / Q000187:drug effects / Q000378:metabolism; D018950:Lipopolysaccharide Receptors / Q000032:analysis; D008070:Lipopolysaccharides / Q000494:pharmacology; D026503:Low Density Lipoprotein Receptor-Related Protein-1 / Q000032:analysis; D008180:Lupus Erythematosus, Systemic / Q000276:immunology*; D008297:Male; D008565:Membrane Proteins / Q000032:analysis; D008875:Middle Aged; D009000:Monocytes / Q000737:chemistry* / Q000276:immunology*; D009504:Neutrophils / Q000502:physiology; D010587:Phagocytosis; D017463:Receptors, Complement 3b / Q000032:analysis; D017452:Receptors, IgG / Q000032:analysis; D014409:Tumor Necrosis Factor-alpha / Q000096:biosynthesis; D055815:Young Adult
chemical_list: D015703:Antigens, CD; C448908:HAVCR2 protein, human; D000072597:Hepatitis A Virus Cellular Receptor 2; D018950:Lipopolysaccharide Receptors; D008070:Lipopolysaccharides; D026503:Low Density Lipoprotein Receptor-Related Protein-1; D008565:Membrane Proteins; D017463:Receptors, Complement 3b; D017452:Receptors, IgG; D014409:Tumor Necrosis Factor-alpha; D016753:Interleukin-10
keywords: Systemic lupus erythematosus; monocyte; neutrophil; phagocytosis