Discover the groundbreaking research on how GRK2-mediated degradation of SAV1 triggers fibroblast-like synoviocyte hyperplasia in rheumatoid arthritis, shedding new light on potential therapeutic targets.
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GRK2 mediated degradation of SAV1 initiates hyperplasia of fibroblast-like synoviocytes in rheumatoid arthritis.
Guo et al., Acta Pharm Sin B 2024
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https://doi.org/10.1016/j.apsb.2023.12.007
This study highlights the critical role of G protein-coupled receptor kinase 2 (GRK2) in the pathogenesis of rheumatoid arthritis (RA) through its effect on the Hippo-YAP signaling pathway. In RA, GRK2 is upregulated by GPCR activation, leading to the phosphorylation, ubiquitination, and degradation of Salvador homolog-1 (SAV1), a key negative regulator of this pathway. This results in the increased nuclear presence of Yes-associated protein (YAP), promoting the proliferation and migration of fibroblast-like synoviocytes (FLSs), which are central to joint destruction in RA. The study found that inhibiting GRK2, either genetically or pharmacologically with paroxetine, restored SAV1 expression and YAP phosphorylation, thereby reducing FLSs proliferation and migration. Paroxetine treatment also showed efficacy in a rat model of RA, reducing FLSs proliferation and improving clinical symptoms. This research underscores the potential of targeting GRK2 as a therapeutic strategy for RA, offering new insights into the mechanisms driving FLSs proliferation and migration in the disease.