Receptor-independent, direct membrane binding leads to cell-surface lipid sorting and Syk kinase activation in dendritic cells.

Receptor-independent, direct membrane binding leads to cell-surface lipid sorting and Syk kinase activation in dendritic cells.
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DOI:
10.1016/j.immuni.2008.09.013
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发表时间:
2008-11-14
期刊:
影响因子:
32.4
通讯作者:
Shi, Yan
Shi, Yan
中科院分区:
医学1区
文献类型:
--
作者:
Ng, Gilbert;Sharma, Karan;Ward, Sandra M.;Desrosiers, Melanie D.;Stephens, Leslie A.;Schoel, W. Michael;Li, Tonglei;Lowell, Clifford A.;Ling, Chang-Chun;Amrein, Matthias W.;Shi, Yan

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抗原呈递细胞 (APC) 与颗粒抗原的结合是免疫激活的关键步骤。此前,我们证明尿酸晶体是有效的佐剂,可引发强大的适应性免疫反应。然而,激活机制尚不清楚。使用原子力显微镜作为实时单细胞激活分析的工具,我们报告尿酸晶体可以直接接合细胞膜,特别是胆固醇成分,其作用力比基于蛋白质的细胞接触强得多。颗粒物质的结合激活树突状细胞 (DC) 中的 Syk 激酶依赖性信号传导。这些观察结果表明,固体结构可以通过膜脂改变来触发免疫细胞激活,而不需要特定的细胞表面受体,并且为晶体相关的关节病、炎症和佐剂性提供了可检验的假设。
Binding of particulate antigens by antigen presenting cells (APC) is a critical step in immune activation. Previously, we demonstrated that uric acid crystals are potent adjuvants, initiating a robust adaptive immune response. However, the mechanisms of activation are unknown. Using atomic force microscopy as a tool for real time single cell activation analysis, we report that uric acid crystals can directly engage cellular membranes, particularly the cholesterol components, with a force substantially stronger than protein based cellular contacts. Binding of particulate substances activates Syk kinase-dependent signaling in dendritic cells (DCs). These observations suggest a mechanism whereby immune cell activation can be triggered by solid structures via membrane lipid alteration without the requirement for specific cell surface receptors, and a testable hypothesis for crystal-associated arthropathies, inflammation and adjuvanticity.
Fcgamma受体介导的巨噬细胞中缺乏SRC家族酪氨酸激酶HCK,FGR和Lyn的吞噬作用。
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