Differential Effect of Cytokine Treatment on Fcα Receptor I- and Fcγ Receptor I-Mediated Tumor Cytotoxicity by Monocyte-Derived Macrophages

Differential Effect of Cytokine Treatment on Fca Receptor I- and Fcg Receptor I-Mediated Tumor Cytotoxicity by Monocyte-Derived Macrophages

Stimulatory Effects of Peroxisome Proliferator-Activated Receptor-γ on Fcγ Receptor-Mediated Phagocytosis by Alveolar Macrophages

Alveolar macrophages abundantly express PPAR-gamma, with both natural and synthetic agonists maintaining the cell in a quiescent state hyporesponsive to antigen stimulation. Conversely, agonists upregulate expression and function of the cell-surface receptor CD36, which mediates phagocytosis of lipids, apoptotic neutrophils, and other unopsonized materials. These effects led us to investigate t...

Effect of Ganoderma Lucidum on Cytokine Release by Peritoneal Macrophages

Background: The water-soluble extract of Ganoderma lucidum (Reishi) has been used as an immunomodulator to stimulate spleen cells proliferation and cytokine expression. Objective: To investigate the effect of Ganoderma lucidum (G. lucidum) on cytokine production by mice peritoneal macrophages. Methods: Mice peritoneal macrophages were prepared by intra-peritoneal injection of 5 ml cold PBS. Per...

Blocking Fcα receptor I on granulocytes prevents tissue damage induced by IgA autoantibodies.

IgA represents the most prominent Ab class at mucosal surfaces and the second most prevalent Ab in human blood after IgG. We recently demonstrated that cross-linking of the granulocyte IgA FcR (FcαRI) by IgA induces a chemotactic-driven positive-feedback migration loop, hereby amplifying recruitment of granulocytes to IgA deposits. Therefore, we postulated that aberrant IgA-Ag complexes, which ...

Coupling of Fcγ receptor I to Fcγ receptor IIb by SRC kinase mediates C-reactive protein impairment of endothelial function.

RATIONALE Elevations in C-reactive protein (CRP) are associated with increased cardiovascular disease risk and endothelial dysfunction. CRP antagonizes endothelial nitric oxide synthase (eNOS) through processes mediated by the IgG receptor Fcγ receptor IIB (FcγRIIB), its immunoreceptor tyrosine-based inhibitory motif, and SH2 domain-containing inositol 5'-phosphatase 1. In mice, CRP actions on ...