Mast cells contribute to autoimmune inflammatory arthritis via their tryptase/heparin complexes.

Mast cells contribute to autoimmune inflammatory arthritis via their tryptase/heparin complexes.
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DOI:
10.4049/jimmunol.182.1.647
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发表时间:
2009-01-01
影响因子:
4.4
通讯作者:
Lee, David M.
Lee, David M.
中科院分区:
医学2区
文献类型:
--
作者:
Shin, Kichul;Nigrovic, Peter A.;Crish, James;Boilard, Eric;McNeil, H. Patrick;Larabee, Katherine S.;Adachi, Roberto;Gurish, Michael F.;Gobezie, Reuben;Stevens, Richard L.;Lee, David M.

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尽管类风湿性关节炎(RA)患者的滑膜组织中通常富含肥大细胞(MCs),但对于肥大细胞在关节炎症和软骨损失中的作用仍知之甚少。mc -限制性胰蛋白酶•肝素复合物具有促炎活性,RA滑液中存在大量的hTryptase-β。小鼠mcp -6 (mMCP-6)是hTryptase-β的同源物,该丝氨酸蛋白酶在关节炎小鼠滑膜中含量丰富。我们现在报道,缺乏胰蛋白酶•肝素复合物的C57BL/6 (B6)小鼠的关节炎反应减弱,在K/B×N小鼠血清转移性关节炎模型中,mMCP-6是主要的胰蛋白酶,负责增加中性粒细胞浸润。虽然这种实验性关节炎模型中的炎症不依赖于蛋白酶激活受体-2,但它依赖于趋化因子受体CXCR2。为了支持后一项数据,滑膜成纤维细胞暴露于hTryptase-β•肝素或mMCP-6•肝素复合物导致中性粒细胞趋化因子CXCL1/KC, CXCL5/LIX和CXCL8/IL-8的表达。我们的蛋白质组学、组织化学和免疫组织化学数据也显示,野生型B6小鼠的关节炎关节中软骨来源的聚集蛋白多糖大量丢失,而mmcp -6缺失的B6小鼠则没有。这些观察结果表明mc -限制性胰蛋白酶•肝素复合物在K/B×N小鼠关节炎模型中的功能贡献,并将我们的小鼠研究结果与RA病理生理学联系起来。
Although mast cells (MCs) often are abundant in the synovial tissues of patients with rheumatoid arthritis (RA), MC’s contribution to joint inflammation and cartilage loss remains poorly understood. MC-restricted tryptase•heparin complexes have pro-inflammatory activity, and significant amounts of hTryptase-β are present in RA synovial fluid. Mouse MC protease-6 (mMCP-6) is the ortholog of hTryptase-β, and this serine protease is abundant in the synovium of arthritic mice. We now report that C57BL/6 (B6) mice lacking their tryptase•heparin complexes have attenuated arthritic responses, with mMCP-6 as the dominant tryptase responsible for augmenting neutrophil infiltration in the K/B×N mouse serum-transfer arthritis model. While inflammation in this experimental arthritis model was not dependent on protease activated receptor-2, it was dependent on the chemokine receptor CXCR2. In support of the latter data, exposure of synovial fibroblasts to hTryptase-β•heparin or mMCP-6•heparin complexes resulted in expression of the neutrophil chemotactic factors CXCL1/KC, CXCL5/LIX, and CXCL8/IL-8. Our proteomics, histochemistry, and immunohistochemistry data also revealed substantial loss of cartilage-derived aggrecan proteoglycans in the arthritic joints of wild-type B6 mice but not mMCP-6-null B6 mice. These observations demonstrate the functional contribution of MC-restricted tryptase•heparin complexes in the K/B×N mouse arthritis model and connect our mouse findings with RA pathophysiology.
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