Blood:IL-18信号可导致严重的TLR9诱导的巨噬细胞活化综合征。

2018-01-03 MedSci MedSci原创

背景:巨噬细胞活化综合征是儿童慢性风湿性疾病的严重并发症,临床主要表现为持续发热、淋巴结及肝脾肿大、全血细胞减少、严重肝功能损害、凝血障碍以及神经系统受累等多脏器病变,骨髓细胞学检查发现分化良好的巨噬细胞吞噬血细胞。巨噬细胞活化综合征(MAS)是一种严重的可致命的疾病,其特点是迅猛累及多脏器的炎症。白介素(IL)-18是白介素-1家族的一种促炎性细胞因子,其活性受其内源性抑制剂IL-18结合蛋白(

背景:巨噬细胞活化综合征是儿童慢性风湿性疾病的严重并发症,临床主要表现为持续发热、淋巴结及肝脾肿大、全血细胞减少、严重肝功能损害、凝血障碍以及神经系统受累等多脏器病变,骨髓细胞学检查发现分化良好的巨噬细胞吞噬血细胞。

巨噬细胞活化综合征(MAS)是一种严重的可致命的疾病,其特点是迅猛累及多脏器的炎症。白介素(IL)-18是白介素-1家族的一种促炎性细胞因子,其活性受其内源性抑制剂IL-18结合蛋白(IL-18BP)调控。现已有报道,MAS患者中IL-18水平升高。

研究人员发现用CpG刺激重复toll样受体(TLR)-9,IL-19BP-/-小鼠表现出严重的MAS症状,包括体重减轻、脾肿大、贫血、血小板减少、高铁色素血症和骨髓吞噬细胞增多(与野生型小鼠相比)。

检测小鼠血清中游离的IL-18,但只在CpG处理过的IL-18BP-/-小鼠血清中可检测到游离的IL-18。IL-18BP-/-小鼠的干扰素(INF)-γ和INF-γ署名基因的表达水平(如趋化因子[Cxcl9]或转录因子CIlta)显着增加。阻断IL-18R信号可降低IL-18BP-/-小鼠的MAS症状的严重程度和INF-γ反应。封闭INF-γ对MAS大部分症状的影响,类似于IL-18抑制剂对MAS症状的影响。

本研究结果表明,内源性IL-18BP在CpG诱导的MAS中发挥保护性作用,IL-18作为INF-γ上游信号,与MAS的严重程度相关。

原始出处:

Charlotte Girard-Guyonvarc'h, et al.Unopposed IL-18 signaling leads to severe TLR9-induced macrophage activation syndrome in mice.Blood  2018  :blood-2017-06-789552;  doi: https://doi.org/10.1182/blood-2017-06-789552

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    2018-10-08 lilianxiang
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    2018-01-05 jjjiang0202
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    2018-01-05 wangbingxhy