ArticleInternational journal of molecular sciences2025
GPR55 Antagonist CID16020046 Suppresses Collagen-Induced Rheumatoid Arthritis by Suppressing Th1/Th17 Cells in Mice.
Article in International journal of molecular sciences, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Lysophosphatidylinositols are degradation products of phosphatidylinositols within cell membranes and digestive metabolites of a high-fat diet in the gut. G-protein-coupled receptor 55 (GPR55) is a receptor that senses lysophosphatidylinositol and acts as an immune mediator, being primarily upregulated during immune cell activation. This study aimed to investigate the role of GPR55, using its antagonist, CID16020046, in a collagen-induced rheumatoid arthritis mouse model. It was observed that DBA-1J mice develop joint lesions characteristic of rheumatoid arthritis following immunization with bovine type II collagen. The administration of CID16020046 (1 mg/kg, intraperitoneally) alleviated rheumatoid arthritis symptoms and inflammatory responses. Histopathological analysis showed that CID16020046 reduced foot edema, proteoglycan loss, and bone erosion in the joints. CID16020046 also decreased rheumatoid-arthritis-induced serum IgG levels, as measured using enzyme-linked immunosorbent assays. The treatment reduced levels of pro-inflammatory cytokines (IL-1β and IL-6), Th1 cytokine (IFN-γ), and Th17 cytokine (IL-17A), along with matrix metalloproteinase-3 (MMP-3) and the receptor activator of nuclear factor-κB ligand (RANKL) in the feet. A significant reduction in splenomegaly was also observed, along with significant reductions in CD4
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