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Human platelets can discriminate between various bacterial LPS isoforms via TLR4 signaling and differential cytokine secretion

机译:人的血小板可以通过TLR4信号传导和差异细胞因子分泌区分各种细菌LPS同种型。

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摘要

Platelets are currently acknowledged as cells of innate immunity and inflammation and play a complex role in sepsis. We examined whether different types of LPS have different effects on the release of soluble signaling/effective molecules from platelets. We used platelet-rich plasma from healthy volunteers and LPS from two strains of gram-negative bacteria with disparate LPS structures. We combined LPS-stimulated platelet supernatants with reporter cells and measured the PBMC cytokine secretion profiles. Upon stimulation of platelets with both Escherichia coli O111 and Salmonella minnesota LPS, the platelet LPS::TLR4 interaction activated pathways to trigger the production of a large number of molecules. The different platelet supernatants caused differential PBMC secretion of IL-6, TNFα, and IL-8. Our data demonstrate that platelets have the capacity to sense external signals differentially through a single type of pathogen recognition receptor and adjust the innate immune response appropriately for pathogens exhibiting different types of 'danger' signals.
机译:目前血小板被认为是先天免疫和炎症的细胞,并在败血症中发挥复杂作用。我们检查了不同类型的LPS是否对来自血小板的可溶信号/有效分子的释放有不同的影响。我们使用来自健康志愿者的血小板富含血浆和LPS,从两个革兰阴性细菌的菌株,具有不同的LPS结构。我们将LPS刺激的血小板上清液与报告细胞组合并测量了PBMC细胞因子分泌型分泌物。在用大肠杆菌O111和Salmonella Minnesota LPS刺激血小板时,血小板LPS :: TLR4相互作用激活途径以引发大量分子的产生。不同的血小板上清液引起IL-6,TNFα和IL-8的差异PBMC分泌。我们的数据表明,血小板具有通过单一类型的病原体识别受体差异地感测外部信号,并适当地调整出现不同类型的“危险”信号的病原体的先天免疫应答。

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