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2006 ; 79
(6
): 1242-51
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Aggregated IgG inhibits the differentiation of human fibrocytes
#MMPMID16543402
Pilling D
; Tucker NM
; Gomer RH
J Leukoc Biol
2006[Jun]; 79
(6
): 1242-51
PMID16543402
show ga
Fibrocytes are fibroblast-like cells, which appear to participate in wound
healing and are present in pathological lesions associated with asthma, pulmonary
fibrosis, and scleroderma. Fibrocytes differentiate from CD14+ peripheral blood
monocytes, and the presence of serum delays this process dramatically. We
previously purified the factor in serum, which inhibits fibrocyte
differentiation, and identified it as serum amyloid P (SAP). As SAP binds to Fc
receptors for immunoglobulin G (IgG; Fc gammaRs), Fc gammaR activation may be an
inhibitory signal for fibrocyte differentiation. Fc gammaR are activated by
aggregated IgG, and we find aggregated but not monomeric, human IgG inhibits
human fibrocyte differentiation. Monoclonal antibodies that bind to Fc gammaRI
(CD64) or Fc gammaRII (CD32) also inhibit fibrocyte differentiation. Aggregated
IgG lacking Fc domains or aggregated IgA, IgE, or IgM do not inhibit fibrocyte
differentiation. Incubation of monocytes with SAP or aggregated IgG inhibited
fibrocyte differentiation. Using inhibitors of protein kinase enzymes, we show
that Syk- and Src-related tyrosine kinases participate in the inhibition of
fibrocyte differentiation. These observations suggest that fibrocyte
differentiation can occur in situations where SAP and aggregated IgG levels are
low, such as the resolution phase of inflammation.
|Antibodies, Monoclonal/pharmacology
[MESH]
|Biopolymers/pharmacology
[MESH]
|Cell Differentiation/drug effects
[MESH]
|Cells, Cultured/cytology/drug effects
[MESH]
|Fibroblasts/cytology/*drug effects
[MESH]
|Humans
[MESH]
|Immunoglobulin A/immunology/pharmacology
[MESH]
|Immunoglobulin E/immunology/pharmacology
[MESH]
|Immunoglobulin Fc Fragments/immunology
[MESH]
|Immunoglobulin G/immunology/*pharmacology
[MESH]
|Immunoglobulin M/immunology/pharmacology
[MESH]
|Intracellular Signaling Peptides and Proteins/antagonists & inhibitors/physiology
[MESH]