期刊
CELLULAR IMMUNOLOGY
卷 263, 期 1, 页码 41-48出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.cellimm.2010.02.014
关键词
Fibrinogen; Immunoglobulin G; Opsonization; Phagocytosis
资金
- NIDCR NIH HHS [T32 DE007034-31S1, DE07926, T32 DE007034, R01 DE007926-15, DE07034] Funding Source: Medline
- NATIONAL INSTITUTE OF DENTAL &CRANIOFACIAL RESEARCH [R01DE007926, T32DE007034, R29DE007926, R43DE007034] Funding Source: NIH RePORTER
In this paper, we aim to characterize fibrinogen-IgG interactions, and explore how fibrinogen alters IgG-mediated phagocytosis. Using enzyme-linked binding assays, we found that fibrinogen binding to IgG is optimized for surfaces coated with high levels of IgG. Using a similar method, we have shown that for an antigen unable to specifically bind fibrinogen, fibrinogen enhances binding of antibodies towards that antigen. For binding of IgG antibodies to cells expressing Fc receptors, we found a bimodal binding response, where low levels of fibrinogen enhance binding of antibody to Fc receptors and high levels reduce it. This corresponds to a bimodal effect on phagocytosis of IgG-coated particles, which is inhibited in the presence of excess IgG during coating of the particles with antibodies and fibrinogen. We conclude that fibrinogen can modulate phagocytosis of IgG-coated particles in vitro by changing IgG binding behavior, and that high fibrinogen levels could negatively affect phagocytosis. (C) 2010 Elsevier Inc. All rights reserved.
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