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KMID : 0606920200280020172
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Biomolecules & Therapeutics
2020 Volume.28 No. 2 p.172 ~ p.183
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PBT-6, a Novel PI3KC2γ Inhibitor in Rheumatoid Arthritis
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Kim Ju-Young
Jung Kyung-Hee
Yoo Jae-Ho
Park Jung-Hee
Yan Hong Hua
Fang Zhenghuan
Lim Joo-Han
Kwon Seong-Ryul
Kim Myung-Ku
Park Hyun-Ju
Hong Soon-Sun
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Abstract
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Phosphoinositide 3-kinase (PI3K) is considered as a promising therapeutic target for rheumatoid arthritis (RA) because of its involvement in inflammatory processes. However, limited studies have reported the involvement of PI3KC2γ in RA, and the underlying mechanism remains largely unknown. Therefore, we investigated the role of PI3KC2γ as a novel therapeutic target for RA and the effect of its selective inhibitor, PBT-6. In this study, we observed that PI3KC2γ was markedly increased in the synovial fluid and tissue as well as the PBMCs of patients with RA. PBT-6, a novel PI3KC2γ inhibitor, decreased the cell growth of TNF-mediated synovial fibroblasts and LPS-mediated macrophages. Furthermore, PBT-6 inhibited the PI3KC2γ expression and PI3K/ AKT signaling pathway in both synovial fibroblasts and macrophages. In addition, PBT-6 suppressed macrophage migration via CCL2 and osteoclastogenesis. In CIA mice, it significantly inhibited the progression and development of RA by decreasing arthritis scores and paw swelling. Three-dimensional micro-computed tomography confirmed that PBT-6 enhanced the joint structures in CIA mice. Taken together, our findings suggest that PI3KC2γ is a therapeutic target for RA, and PBT-6 could be developed as a novel PI3KC2γ inhibitor to target inflammatory diseases including RA.
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KEYWORD
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Rheumatoid arthritis, Collagen-induced arthritis, PI3KC2γ, RANKL
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