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Osteoarthritis-associated basic calcium phosphate crystals induce pro-inflammatory cytokines and damage-associated molecules via activation of Syk and PI3 kinase

机译:骨关节炎相关的碱性磷酸钙晶体通过激活Syk和PI3激酶诱导促炎性细胞因子和损伤相关分子

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摘要

The pro-inflammatory cytokines, TNFα, IL-1 and IL-18, amplify cartilage destruction associated with osteoarthritis (OA). Current data suggest that basic calcium phosphate (BCP) crystals are potent drivers of inflammatory mediator and matrix metalloprotease expression in the OA joint. It has previously been demonstrated that synovial macrophages play a role in initiating and driving BCP-induced inflammation. However, the molecular mechanisms by which BCP crystals exert their effects remain unclear. Here we demonstrate that exposure of macrophages to BCP crystals leads to activation of Syk and PI3 kinase. Furthermore, we show that production of pro-inflammatory cytokines and phosphorylation of the downstream kinase, ERK, are suppressed following treatment with Syk and PI3 kinase inhibitors. Finally, we demonstrate that treatment of macrophages with BCP crystals induces the production of the damage-associated molecule, S100A8, in a Syk dependent manner. We therefore identify Syk and PI3 kinase as potential novel targets for the treatment of BCP-related pathologies.
机译:促炎细胞因子TNFα,IL-1和IL-18放大与骨关节炎(OA)相关的软骨破坏。当前数据表明,碱性磷酸钙(BCP)晶体是OA关节中炎症介质和基质金属蛋白酶表达的有效驱动器。先前已经证明滑膜巨噬细胞在引发和驱动BCP诱导的炎症中起作用。然而,尚不清楚BCP晶体发挥作用的分子机制。在这里,我们证明巨噬细胞暴露于BCP晶体导致Syk和PI3激酶的激活。此外,我们显示,用Syk和PI3激酶抑制剂治疗后,促炎性细胞因子的产生和下游激酶ERK的磷酸化受到抑制。最后,我们证明了用BCP晶体处理巨噬细胞以Syk依赖的方式诱导了损伤相关分子S100A8的产生。因此,我们确定Syk和PI3激酶为治疗BCP相关病理的潜在新靶标。

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