Premium
Inhibition of destructive autoimmune arthritis in FcγRIIa transgenic mice by small chemical entities
Author(s) -
Pietersz Geoffrey A,
Mottram Patricia L,
Velde Nicholas C,
Sardjono Caroline Tan,
Esparon Sandra,
Ramsland Paul A,
Moloney Gerard,
Baell Jonathan B,
McCarthy Tom D,
Matthews Barry R,
Powell Maree S,
Hogarth P Mark
Publication year - 2009
Publication title -
immunology and cell biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.999
H-Index - 104
eISSN - 1440-1711
pISSN - 0818-9641
DOI - 10.1038/icb.2008.82
Subject(s) - immune system , in vivo , immunology , transgene , biology , tumor necrosis factor alpha , receptor , rheumatoid arthritis , arthritis , pharmacology , microbiology and biotechnology , biochemistry , gene
The interaction of immune complexes with the human Fc receptor, FcγRIIa, initiates the release of inflammatory mediators and is implicated in the pathogenesis of human autoimmune diseases, including rheumatoid arthritis and systemic lupus erythematosus, so this FcR is a potential target for therapy. We have used the three‐dimensional structure of an FcγRIIa dimer to design small molecule inhibitors, modeled on a distinct groove and pocket created by receptor dimerization, adjacent to the ligand‐binding sites. These small chemical entities (SCEs) blocked immune complex‐induced platelet activation and aggregation and tumor necrosis factor secretion from macrophages in a human cell line and transgenic mouse macrophages. The SCE appeared specific for FcγRIIa, as they inhibited only immune complex‐induced responses and had no effect on responses to stimuli unrelated to FcR, for example platelet stimulation with arachidonic acid. In vivo testing of the SCE in FcγRIIa transgenic mice showed that they inhibited the development and stopped the progression of collagen‐induced arthritis (CIA). The SCEs were more potent than methotrexate and anti‐CD3 in sustained suppression of CIA. Thus, in vitro and in vivo activity of these SCE FcγRIIa receptor antagonists demonstrated their potential as anti‐inflammatory agents for autoimmune diseases involving immune complexes.