title: Mature polymorphonuclear leukocytes express high-affinity receptors for IgG (Fc gamma RI) after stimulation with granulocyte colony-stimulating factor (G-CSF).
abstract: The high-affinity receptor for the constant region of immunoglobulin G IgG (Fc gamma RI; CD64) is virtually undetectable on mature polymorphonuclear neutrophils (PMNs) in healthy individuals but is expressed on PMNs in patients with certain infections and in patients treated with recombinant human granulocyte colony-stimulating factor (rhG-CSF). The induction of Fc gamma RI by rhG-CSF has previously been reported to result from effects on immature granulocyte progenitors. To evaluate the G-CSF effect on mature PMNs, we studied the correlation between G-CSF plasma concentration and expression of Fc gamma RI on PMNs in vivo as well as the effect of G-CSF on Fc gamma RI expression on mature PMNs in vitro. Fc gamma RI expression on PMNs correlated (R = 0.79; p < .001) with plasma concentrations of endogenous or recombinant G-CSF in healthy volunteers and in patients undergoing high-dose chemotherapy and autologous bone marrow transplantation. PMNs exhibited a unimodal distribution for elevated Fc gamma RI expression, suggesting that G-CSF induced increased expression of Fc gamma RI on mature as well as on immature PMNs. In vitro, incubation of mature PMNs with G-CSF induced mRNA for Fc gamma RI. Significant Fc gamma RI surface expression was induced in a time- and dose-dependent manner. Thus, G-CSF can act on mature PMNs to increase Fc gamma RI expression and may be useful for stimulating antibody mediated immune functions of PMNs in vivo.
authors.affiliation: Department of Microbiology, Dartmouth Medical School, Lebanon, New Hampshire 03756.
authors.forename: G H
authors.initials: GH
authors.lastname: Gericke
authors.forename: S G
authors.initials: SG
authors.lastname: Ericson
authors.forename: L
authors.initials: L
authors.lastname: Pan
authors.forename: L E
authors.initials: LE
authors.lastname: Mills
authors.forename: P M
authors.initials: PM
authors.lastname: Guyre
authors.forename: P
authors.initials: P
authors.lastname: Ely
mesh_terms: D016026:Bone Marrow Transplantation; D015870:Gene Expression; D016179:Granulocyte Colony-Stimulating Factor / Q000097:blood / Q000494:pharmacology*; D006801:Humans; D007371:Interferon-gamma / Q000494:pharmacology; D009504:Neutrophils / Q000378:metabolism*; D012333:RNA, Messenger / Q000235:genetics; D017452:Receptors, IgG / Q000378:metabolism*; D014182:Transplantation, Autologous
chemical_list: D012333:RNA, Messenger; D017452:Receptors, IgG; D016179:Granulocyte Colony-Stimulating Factor; D007371:Interferon-gamma