title: Evaluation of Fc-receptor positive (FcR+) and negative (FcR-) monocyte subsets in sepsis.
abstract: The monocyte/macrophage (Mphi is central in the regulation of the immune response in states of trauma and sepsis. Because monocyte subsets, characterized by expression of the Fc-receptor (FcR), were shown to play distinct immunologic roles in trauma, it was the objective of this study to assess insights into the functional role of FcR positive (FcR+) and negative (FcR-) subclasses in surgical sepsis. In a prospective study, peripheral blood Mphi from 20 septic patients and 10 healthy volunteers were evaluated on consecutive days after the onset of sepsis. FcR+/- subsets were separated by rosetting with antibody-coated human erythrocytes. Receptor expression and synthesis of proinflammatory cytokines were used to evaluate the functional role of these cells. We demonstrated a significant monocytosis (350%; p<.01) and suppression of human lymphocyte antigen (HLA-DR) expression (35%; p<.05). Synthesis of Interleukin-1beta (IL-1beta; e.g., Day 1: 230+/-30 pg/mL) and Interleukin-6 (IL-6; e.g., Day 1: 1920+/-350 U/mL) were significantly higher (p<.05) in FcR+ subsets than in controls (IL-1beta: 100+/-5 pg/mL; IL-6: 353+/-75 U/mL). Tumor necrosis factor-alpha (TNF-alpha) was elevated in FcR+ monocytes but did not reach a significant value. Interleukin-8 (IL-8) synthesis showed only on Day 1 and in controls significant differences in FcR+ and FcR- cells (Day1: FcR-: 19.6+/-4.1 nM; FcR+: 9+/-4.3 nM). Sepsis results in a significant shift toward FcR+ monocytes. This cell population is characterized by high proinflammatory cytokine synthesis. The extent of this shift seems to identify a group of high risk septic patients that might benefit from immunomodulatory therapy.
authors.affiliation: Ludwig-Maximilians University Munich, Klinikum Grosshadern, Department of Surgery, Germany.
authors.forename: C
authors.initials: C
authors.lastname: Schinkel
authors.forename: R
authors.initials: R
authors.lastname: Sendtner
authors.forename: S
authors.initials: S
authors.lastname: Zimmer
authors.forename: A
authors.initials: A
authors.lastname: Walz
authors.forename: L
authors.initials: L
authors.lastname: Hültner
authors.forename: E
authors.initials: E
authors.lastname: Faist
mesh_terms: D000328:Adult; D000368:Aged; D005260:Female; D006684:HLA-DR Antigens / Q000378:metabolism; D006801:Humans; D007249:Inflammation / Q000378:metabolism; D007375:Interleukin-1 / Q000378:metabolism; D015850:Interleukin-6 / Q000378:metabolism; D016209:Interleukin-8 / Q000378:metabolism; D008297:Male; D008875:Middle Aged; D009000:Monocytes / Q000378:metabolism*; D011237:Predictive Value of Tests; D011961:Receptors, Fc / Q000378:metabolism*; D018805:Sepsis / Q000378:metabolism*; D014409:Tumor Necrosis Factor-alpha / Q000378:metabolism
chemical_list: D006684:HLA-DR Antigens; D007375:Interleukin-1; D015850:Interleukin-6; D016209:Interleukin-8; D011961:Receptors, Fc; D014409:Tumor Necrosis Factor-alpha