血清淀粉样蛋白A诱导中性粒细胞胞外诱捕网形成

摘要

目的 探究血清淀粉样蛋白A(SAA)能否在体外诱导中性粒细胞形成中性粒细胞胞外诱捕网(NETs).方法 建立稳定的体外诱导NETs形成方法,包括外周血中性粒细胞的分离、细胞体外培养、NETs的诱导和形态学观察.提取健康志愿者的外周血中性粒细胞,分为阴性对照(NC)组、SAA组和脂多糖(LPS)组,给予相应的刺激后,观察NETs的形成并计算百分率,酶联免疫吸附试验(ELISA)检测培养上清中人组蛋白3(h3)的含量.结果 提取的外周血中性粒细胞纯度与细胞活力均在95%以上.显微镜下观察到部分细胞的细胞核失去原有核型,向外扩散形成网状,即NETs.与NC组相比,接受SAA刺激的中性粒细胞有更多的NETs形成(P<0.05).培养液上清中的h3含量显著高于NC组(P<0.05).结论 SAA可在体外诱导中性粒细胞形成NETs.%Objective To explore whether serum amyloid A (SAA) can induce the formation of neutrophil extracellular traps(NETs)in neutrophils in vitro. Methods A stable method for inducing NETs formation in vitro was established, in-cluding isolation of peripheral blood neutrophils, cell culture, and NETs formation and observation. The neutrophils were iso-lated from peripheral blood of healthy volunteers. And cells were cultured in vitro and classified into three groups:negative control (NC) group, SAA group and lipopolysaccharide (LPS) group. Following the distinct stimulation in three groups, NETs formation was observed and its percentage was calculated. The concentration of hinstone (h) 3 in supernatant was detected by ELISA. Results The purification and vitality of isolated neutrophils were both more than 95%. The nuclei of neutrophils lost their shape and spread, NETs formation was found. More NETs formation was found in SAA group than that in NC group (P < 0.05). Moreover, the concentration of h3 in supernatant was significantly higher in SAA group than that in NC group (P<0.05). Conclusion SAA can induce the formation of NETs in vitro.