Kevin A. Davies

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BACKGROUND There is evidence that mesangial cells express Fcgamma receptors in vitro, but the in vivo relevance of this is not known. FcRgamma-/- mice lack the gamma chain signaling subunit and therefore do not express the activator Fcgamma receptors (FcgammaRI and FcgammaRIII) or the high affinity IgE receptor, FcepsilonRI. FcRgamma-/- mice were protected(More)
We have shown that human endothelial cells (EC) are protected against complement-mediated injury by the inducible expression of decay-accelerating factor (DAF). To understand further the importance of DAF regulation, we characterized EC DAF expression on murine EC in vitro and in vivo using a model of glomerulonephritis. Flow cytometry using the monoclonal(More)
Recognition of immune complexes in glomeruli by activator Fcgamma receptors (FcgammaRI and FcgammaRIII) is an important step in the development of glomerulonephritis. The low-affinity receptor (FcgammaRIII) has previously been shown to be important in passive heterologous immune complex glomerulonephritis. However, most forms of human glomerulonephritis(More)
Study of patients with complement deficiency has supplied important insights into the physiological importance of this component of the innate immune system. The most surprising finding to emerge from the study of such patients is the strong link between deficiencies of classical pathway proteins and susceptibility to SLE. This observation has stimulated(More)
A peptide prepared from purified factor 13B (F13B) was sequenced, and a single, long oligonucleotide corresponding to its cognate DNA sequence was constructed and used to screen a chromosome 7 specific genomic library. The positive clone isolated, designated pKV13, was only related to F13B at the oligonucleotide region, but has proved to be a valuable(More)
OBJECTIVE To explore the Fc receptor-dependent handling of immune complexes (ICs) by the fixed mononuclear phagocytic systems (MPS) in patients with systemic lupus erythematosus (SLE). METHODS The processing in vivo of soluble model (123)I-hepatitis B/ anti-hepatitis B ICs was studied in 12 healthy subjects and 10 patients with active SLE. ICs that fixed(More)
The role of the classical complement pathway in humoral immune responses was investigated in gene-targeted C1q-deficient mice (C1qA-/-). Production of antigen-specific immunoglobulin (Ig)G2a and IgG3 in primary and secondary responses to T cell-dependent antigen was significantly reduced, whereas IgM, IgG1, and IgG2b responses were similar in control and(More)
Vascular endothelium is continuously exposed to complement-mediated challenge, and this is enhanced during inflammation. Although the complement-regulatory proteins decayaccelerating factor (DAF), CD59, and membrane cofactor protein (MCP) protect endothelial cells (ECs) against complement-mediated injury, the control of their expression and relative(More)
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