2002
DOI: 10.1016/s1074-7613(02)00294-7
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FcγRI (CD64) Contributes Substantially to Severity of Arthritis, Hypersensitivity Responses, and Protection from Bacterial Infection

Abstract: The high-affinity receptor for IgG, FcgammaRI, shares its capacity to bind IgG2a immune complexes (IgG2a-IC) with the low-affinity receptor FcgammaRIII and complement factors, hampering the definition of its biological role. Moreover, in vivo, FcgammaRI is occupied by monomeric IgG2a, reducing its accessibility to newly formed IgG2a-IC. By using a variety of FcgammaR(-/-) mice, we demonstrate that in the absence of FcgammaRI, the IgG2a-IC-induced cellular processes of phagocytosis, cytokine release, cellular c… Show more

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Cited by 277 publications
(273 citation statements)
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“…The specific role for Fc␥RI in chondrocyte death was confirmed in the present study, since IFN␥ overexpression in Fc␥RIII Ϫ/Ϫ mice resulted in high levels of chondrocyte death similar to those in controls. Since Fc␥RI is exclusively expressed on macrophages (37), this proves that macrophage activation is crucial in the induction of chondrocyte death.…”
Section: Discussionmentioning
confidence: 80%
“…The specific role for Fc␥RI in chondrocyte death was confirmed in the present study, since IFN␥ overexpression in Fc␥RIII Ϫ/Ϫ mice resulted in high levels of chondrocyte death similar to those in controls. Since Fc␥RI is exclusively expressed on macrophages (37), this proves that macrophage activation is crucial in the induction of chondrocyte death.…”
Section: Discussionmentioning
confidence: 80%
“…OT-1 C57Bl/6J mice and Ly5.1 congenic mice were obtained from Jackson Lab, (Bar Harbor, ME, USA). C57Bl/6J FcgRI À / À mice, 23 FcgRI/IIIA/IV ('FcgRIIB-only'), 26 FcgRIII À / À mice, 22 FcgRIV À / À mice, 24 and FcgRI/IIB/III FceRI/II (5KO, also known as 'FcgRIV-only') mice 25 Tumor-infiltrating lymphocytes analyses. At indicated time points, tumors were harvested, cut into small pieces and digested in Liberase TM 25 mg/ml (Roche, Boulogne Billancourt, France) and DNase I 150 U/ml (Calbiochem, Millipore, Molsheim, France) for 30 min at 37 1C.…”
Section: Methodsmentioning
confidence: 99%
“…FcgRs are broadly expressed on immune cells and encompass both activating, for example, FcgRI, III and IV (including the FcRg subunit), and inhibitory, for example, FcgRIIB and subtype complexes. 21 MCA205 OVA was inoculated into the mice genetically manipulated to lack specific FcRg subtypes, namely FcgRIII, 22 FcgRI, 23 FcgRIV, 24 as well as into 'FcgRIV only' mice (which lack FcgRI/IIB/III/FceRI/II genes) 25 or 'FcgRIIB only' mice (which lack the FcgRI/IIIA/IV genes). 26 Thus, anthracyclines similarly reduced tumor growth in these FcRg-deficient mice (Figures 5a-f), as it did in WT C57Bl6 controls (see above, Figure 2a).…”
Section: Contribution Of B-cell Responses After Chemotherapy D Hannanmentioning
confidence: 99%
“…In contrast to HVs, a significant expression of CD64 [a wellknown marker for phagocytosis (30,31)] was found in CLL monocytes (Fig. 2B).…”
Section: Lps Ex Vivo Challenge Of Isolated Monocytes Revealed An Et Smentioning
confidence: 97%
“…In addition to a potent phagocytic function, CD64 is associated with a low Ag-presentation capacity (15,30,31). When we studied the cell surface levels of two important isotypes of MHC class II (HLA-DR and HLA-DQ) by flow cytometry in patients with CLL, they showed a significantly reduced expression after LPS challenge (Fig.…”
Section: Lps Ex Vivo Challenge Of Isolated Monocytes Revealed An Et Smentioning
confidence: 99%