雷帕霉素处理后的树突状细胞对感染后输血相关急性肺损伤保护作用

Study on the protective effect of rapamycin-treated dendritic cells on transfusion-related acute lung injury after infection

目的 探讨雷帕霉素处理后的树突状细胞(dendritic cells, DC)干预感染后输血相关急性肺损伤(transfusion-related acute lung injury, TRALI)策略的可行性。方法 1)通过细菌脂多糖(LPS)联合抗-H2Kd诱导小鼠TRALI的发病,并测定小鼠肺脏,肾脏,脾脏和脑组织等器官湿干比及肛温,建立TRALI小鼠模型;2)体外诱导小鼠骨髓来源的DC细胞,并经雷帕霉素(10nM)处理24 h;3)小鼠经尾静脉注射或不注射雷帕霉素或雷帕霉素处理后的DC,1 h后腹腔注射LPS,24 h后注射抗-H2Kd诱导TRALI发病,观察并记录小鼠死亡情况,并通过小鼠体温、肺脏湿干比、胸腔积液重量以及肺组织病理切片分析小鼠TRALI发病后情况。结果 通过对不同浓度和不同容量的抗-H2Kd溶液诱导效果的比较,本研究选择0.1 mg/kg LPS联合4.5 mg/kg抗-H2Kd(输注体积100μL)诱导的小鼠模型为TRALI小鼠模型。该模型小鼠TRALI发病后,能显著增加了肺脏湿干比,体温显著降低。使用雷帕霉素处理后DC对TRALI发病小鼠进行干预后,死亡率显著降低,小鼠肺组织病变显著改善,且效果优于雷帕霉素处理组;与TRALI发病组相比,干预组胸腔积液重量呈现显著减少(P<0.05),但肺脏湿干比和体温差异无统计学意义。结论 通过LPS联合抗体能有效诱导稳定且典型的TRALI小鼠模型,可见先后存在感染性炎症和输血相关炎性物质是TRALI发病的决定性因素。同时,雷帕霉素处理后DC对感染后TRALI具有保护作用,有望成为干预TRALI恶化的潜在的细胞治疗策略。

Objective To investigate the viability of rapamycin-treated rapamycin-treated dendritic cells(DCs) in intervening transfusion-related acute lung injury(TRALI) after infection.Methods 1)The TRALI mouse model was induced by lipopolysaccharide(LPS) combined with anti-H2 Kd antibody. The mice anal temperature and the wet/dry ratio of lung, kidney, spleen and brain tissues were measured. 2) Mouse bone marrow-derived DC cells were induced in vitro and treated with rapamycin(10 nM) for 24 h. 3) Mice were injected with or without rapamycin or rapamycin-treated DC, then injected with LPS intraperitoneally one hour later, finally injected with anti-H2 Kd antibody 24 hours later to induce the onset of TRALI. The death situation of the mice was observed and recorded. The condition of mice after the onset of TRALI was analyzed by mouse body temperature, lung wet-dry ratio, and pleural effusion weight and lung histopathological sections.Results By comparing the induction effects of anti-H2 Kd antibody solutions with different concentrations and volumes, the mouse model induced by 0.1 mg/kg LPS combined with 4.5 mg/kg anti-H2 Kd antibody(infusion volume of 100μL) was selected as the TRALI mouse model for this study. After the onset of TRALI, the wet/dry ratio of the lungs could be significantly increased and the body temperature could be significantly reduced in the model mice. After the intervention of TRALI mice with DCs treated with rapamycin, the mortality rate was significantly reduced, and the lung tissue lesions of the mice were significantly improved, whose protection effect was better than that of the rapamycin-treated group. Compared with the TRALI incidence group, the weight of pleural effusion in the intervention group was significantly reduced(P<0.05), but there was no significant difference in lung wet/dry ratio and body temperature. Conclusion The combination of LPS and antibodies can effectively induce a stable and typical TRALI mouse model, suggesting that the presence of infectious inflammation and blood transfusion-related inflammatory substances are the decisive factor for the pathogenesis of TRALI. Meanwhile, DCs treated with rapamycin have a protective effect on post-infection transfusion-related acute lung injury, which is expected to be a potential cell therapy strategy to intervene in the exacerbation of TRALI.