title: Selective expansion of the CD14(+)/CD16(bright) subpopulation of circulating monocytes in patients with hemophagocytic syndrome.
abstract: Overproduction of proinflammatory cytokines is characteristic of hemophagocytic syndrome (HPS), a highly lethal inflammatory disease. Peripheral blood monocytes include two distinct subpopulations according to surface antigen expression: a major type, CD14(+)/CD16(-) (classical monocytes), and a minor type, CD14(+)/CD16(bright) (proinflammatory monocytes). Among peripheral blood monocytes from HPS patients, CD14(+)/CD16(bright) cells were increased, together with lipopolysaccharide-induced production of tumor necrosis factor (TNF)-alpha and interleukin (IL)-6. By three-color immunofluorescence, CD14(+)/CD16(bright) monocytes exhibited more intense human leukocytic antigen DR than CD14(+)/CD16(-) monocytes, consistent with greater maturity. Serum IL-6, TNF-alpha, and IL-8 were increased in HPS patients. A sensitive inflammatory marker, neutrophil CD64 expression, also was significantly elevated in HPS patients. In conclusion, expansion of proinflammatory monocytes and increased expression of neutrophil CD64 appeared to be important in the pathophysiology of HPS. Expansion of CD14(+)/CD16(bright) monocytes and neutrophil CD64 expression could serve as indicators of the inflammatory state in HPS.
authors.affiliation: Department of Emergency and Critical Care Medicine, Aichi Medical University, Aichi, Japan. takeyama@aichi-med-u.ac.jp
authors.forename: N
authors.initials: N
authors.lastname: Takeyama
authors.forename: T
authors.initials: T
authors.lastname: Yabuki
authors.forename: T
authors.initials: T
authors.lastname: Kumagai
authors.forename: S
authors.initials: S
authors.lastname: Takagi
authors.forename: S
authors.initials: S
authors.lastname: Takamoto
authors.forename: H
authors.initials: H
authors.lastname: Noguchi
mesh_terms: D000328:Adult; D000368:Aged; D015703:Antigens, CD / Q000097:blood* / Q000276:immunology; D015415:Biomarkers; D016022:Case-Control Studies; D005260:Female; D058851:GPI-Linked Proteins; D006801:Humans; D007249:Inflammation / Q000097:blood*; D018950:Lipopolysaccharide Receptors / Q000097:blood* / Q000276:immunology; D051359:Lymphohistiocytosis, Hemophagocytic / Q000097:blood* / Q000276:immunology; D008297:Male; D008875:Middle Aged; D009000:Monocytes / Q000145:classification* / Q000276:immunology; D009504:Neutrophils / Q000145:classification; D017452:Receptors, IgG / Q000097:blood* / Q000276:immunology
chemical_list: D015703:Antigens, CD; D015415:Biomarkers; C428200:FCGR3B protein, human; D058851:GPI-Linked Proteins; D018950:Lipopolysaccharide Receptors; D017452:Receptors, IgG