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. 1991 Mar 1;88(5):1616–1620. doi: 10.1073/pnas.88.5.1616

Monomeric IgG2a promotes maturation of bone-marrow macrophages and expression of the mannose receptor.

S Schreiber 1, J S Blum 1, W F Stenson 1, R P MacDermott 1, P D Stahl 1, S L Teitelbaum 1, S L Perkins 1
PMCID: PMC51075  PMID: 2000369

Abstract

The macrophage mannose receptor, a 172-kDa lineage-specific glycoprotein, partakes in nonopsonin-mediated phagocytosis by recognition of terminal mannose residues on targeted particles. Because appearance of the receptor progresses with monocyte/macrophage differentiation, its expression is indicative of the maturational state of the cell. Monomeric IgG2a and IgG2b up-regulate mannose-receptor surface expression and biosynthesis by murine bone-marrow macrophage precursors as much as 7- to 12-fold in a dose-dependent manner. IgG2a accelerates macrophage mannose-receptor expression by several days during in vitro bone-marrow differentiation; however, treated and control cells ultimately express equivalent levels of receptor. Moreover, the effect is independent of cell cycle or ambient levels of colony-stimulating factor 1. The coinduction of another maturation-dependent lineage-specific antigen, F4/80, and the fact that macrophage precursors respond to IgG2a only within the first day of culture, indicate that the targeted cell is an early myelomonocytic precursor, responsive only during a short, early developmental window. The effect is specific for immunoglobulin molecules of the IgG2a and IgG2b subclasses and probably involves an Fc gamma-receptor signal-transduction pathway but not macrophage priming or activation. Most importantly, a paracrine mechanism of immunoglobulin-mediated bone-marrow macrophage differentiation is suggested by experiments in which basal levels of mannose-receptor expression are reduced by continual removal of B-cell-generated IgG from marrow cultures. Thus, IgG2a and IgG2b prompt mannose-receptor synthesis and bone-marrow macrophage differentiation and may, therefore, play a role in the regulation of macrophage differentiation in host defense.

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Selected References

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