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The prevalence of autoimmune diseases such as inflammatory bowel disease (IBD) and rheumatoid arthritis (RA) is increasing. Glucocorticoid-induced TNFR-related protein (GITR), a TNF receptor superfamily (TNFRSF) member, is activated by GITR-ligand (GITRL). GITR signaling is pathogenic in models of RA and IBD, leading to lymphocyte proliferation and secretion of pro-inflammatory cytokines. Despite promising preclinical data, GITR neutralization in autoimmune diseases remains under-explored, due to challenges in avoiding antibody-mediated GITR activation. Therefore, we developed a human GITR-specific antibody that inhibits GITRL-mediated GITR-signaling, while preserving the GITRL epitope on GITR. The antibody strongly inhibited GITR signaling in the in vitro assays via a novel mechanism of disrupting downstream higher-order structures rather than direct blocking of GITR binding. Even though the antibody did not demonstrate efficacy in an NSG human skin graft transplant model, this general mechanism might be a viable therapeutic intervention for other TNFRSF members relying more significantly on soluble ligands.
Pubmed ID: 41413164
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