Blood:全身炎症反应过程中诱导吞噬细胞耐受的信号机制

2019-05-13 MedSci MedSci原创

吞噬细胞对外源性和内源性刺激的炎症反应受到严格的调控。这种调节在全身炎症反应综合征(SIRS)中具有重要作用。在SIRS中,吞噬细胞最初会发生一种超炎症反应,随后转为一种次级的低反应状态,即所谓的耐受。这种低反应性可由Toll样受体4 (TLR4)的内毒素刺激引起,从而在以后的再刺激条件下改善反应。这种炎症反应模式的调整被称为固有免疫记忆。

中心点:

体外循环术后,MRP警报素可诱导单核细胞发生IL-10、STAT3和BCL3依赖性的低反应。

摘要:

吞噬细胞对外源性和内源性刺激的炎症反应受到严格的调控。这种调节在全身炎症反应综合征(SIRS)中具有重要作用。在SIRS中,吞噬细胞最初会发生一种超炎症反应,随后转为一种次级的低反应状态,即所谓的耐受。这种低反应性可由Toll样受体4 (TLR4)的内毒素刺激引起,从而在以后的再刺激条件下改善反应。这种炎症反应模式的调整被称为固有免疫记忆。

有趣地是,在无菌环境中,内源性TLR4配体也可诱导耐受,如警报素MRP8(髓细胞相关蛋白)和MRP14。但目前在临床相关疾病中,引起吞噬细胞低反应的信号通路尚不明确。

目前,Nicole Freise等研究人员发现了两个主要的信号级联反应,在MRP诱导的吞噬细胞耐受过程中被激活,并证明了PI3K/AKT/GSK-3β信号通路可干扰NF-κB驱动的基因表达,并可抑制GSK-3β,模拟体内耐受。

此外,研究人员还发现白细胞介素-10(IL-10)可触发转录因子STAT3和BCL-3,作为MRP诱导耐受的主要调控因子。因此,STAT3突变阴性的患者无耐受现象。在临床相关的全身性无菌应激条件下,体外循环术中,研究人员证实了MRP表达的初始诱导和单核细胞耐受诱导与STAT3和BCL-3的核易位相关。

本研究表明JAK-STAT药物抑制剂或可成为未来预防SIRS继发低反应性并发症的有效措施。

原始出处:

Nicole Freise, et al.Signaling mechanisms inducing hypo-responsiveness of phagocytes during systemic inflammation. Blood 2019 :blood.2019000320; doi: https://doi.org/10.1182/blood.2019000320

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