摘要目的:评价Z-DNA结合蛋白1(ZBP1)/受体相互作用蛋白激酶1(RIPK1)信号通路在脂多糖(LPS)-三磷酸腺苷(ATP)致小鼠巨噬细胞焦亡中的作用。方法:常规培养小鼠RAW264.7巨噬细胞，采用随机数字表法分为6组( n＝9)：空白对照组(C组)、LPS-ATP组、LPS-ATP＋转染阴性对照scRNA组(LPS-ATP＋scRNA组)、LPS-ATP＋ZBP1小干扰RNA组(LPS-ATP＋siRNA组)、LPS-ATP＋二甲基亚砜组(LPS-ATP＋DMSO组)和LPS-ATP＋RIPK1抑制剂nec-1组(LPS-ATP＋nec-1组)。LPS-ATP＋siRNA组使用siRNA技术抑制ZBP1的表达，LPS-ATP＋nec-1组给予nec-1抑制RIPK1的表达；C组常规培养，余5组给予10 μg/ml LPS孵育24 h，然后加入5 mmol/L ATP孵育30 min构建细胞焦亡模型。采用CCK-8法检测细胞存活情况；ELISA法检测细胞上清液IL-1β、IL-6、IL-18和TNF-α浓度；碘化丙啶荧光染色法测定细胞焦亡情况；Western blot法检测ZBP1、RIPK1、半胱氨酸天冬氨酸蛋白酶1(caspase-1)和消皮素D(GSDMD)表达。 结果:与C组比较，LPS-ATP组细胞存活率降低，细胞焦亡率升高，上清液IL-1β、IL-6、IL-18及TNF-α浓度升高，细胞ZBP1、RIPK1、caspase-1和GSDMD表达上调( P<0.05)；与LPS-ATP组比较，LPS-ATP＋scRNA组和LPS-ATP＋DSMO组上述各指标差异无统计学意义( P>0.05)；与LPS-ATP＋scRNA组比较，LPS-ATP＋siRNA组细胞存活率升高，细胞焦亡率降低，上清液IL-1β、IL-6、IL-18及TNF-α浓度降低，细胞ZBP1、RIPK1、caspase-1和GSDMD表达下调( P<0.05)；与LPS-ATP＋DSMO组比较，LPS-ATP＋nec-1组细胞存活率升高，细胞焦亡率降低，上清液IL-1β、IL-6、IL-18及TNF-α浓度降低，RIPK1、caspase-1和GSDMD表达下调( P<0.05)，ZBP1表达差异无统计学意义( P>0.05)。 结论:ZBP1/RIPK1信号通路激活参与了LPS-ATP致小鼠巨噬细胞焦亡的过程。

abstractsObjective:To evaluate the role of Z-DNA-binding protein 1 (ZBP1)/receptor-interacting protein kinase 1 (RIPK1) signaling pathway in lipopolysaccharide (LPS)-adenosine triphosphate (ATP)-induced pyroptosis in macrophages of mice.Methods:The RAW264.7 macrophages from mice were routinely cultured and divided into 6 groups ( n=9 each) using a random number table method: control group (group C), LPS-ATP group, LPS-ATP+ transfection negative control scRNA group (group LPS-ATP+ scRNA), LPS-ATP+ ZBP1 small interference RNA group (group LPS-ATP+ siRNA), LPS-ATP+ dimethyl sulfoxide group (group LPS-ATP+ DSMO), and LPS-ATP+ RIPK1 inhibitor nec-1 group (group LPS-ATP+ nec-1). The siRNA technique was used to inhibit the expression of ZBP1 in group LPS-ATP+ siRNA. The RIPK1 inhibitor nec-1 was given to inhibit the expression of RIPK1 protein in group LPS-ATP+ nec-1. Group C was routinely cultured. Cells were incubated with 10 μg/ml LPS for 24 h, then 5 mmol/L ATP was added, and the cells were incubated for 30 min to develop the cell pyroptosis model in the remaining 5 groups. The cell survival was detected by the CCK-8 assay. The concentrations of interleukin-1beta (IL-1β), IL-6, IL-18 and tumor necrosis factor-alpha (TNF-α) in cell supernatant were determined by enzyme-linked immunosorbent assay. The pyroptosis was determined by propidium iodide fluorescence staining. Western blot was used to detect the expression of ZBP1, RIPK1, caspase-1 and GSDMD. Results:Compared with group C, the cell survival rate was significantly decreased, the cell pyroptosis rate and concentrations of IL-1β, IL-6, IL-18 and TNF-α in the supernatant were increased, and the expression of ZBP1, RIPK1, caspase-1 and GSDMD was up-regulated in group LPS-ATP ( P<0.05). Compared with group LPS-ATP, no significant change was found in the parameters mentioned above in group LPS-ATP+ scRNA and group LPS-ATP+ DSMO ( P>0.05). Compared with group LPS-ATP+ scRNA, the cell survival rate was significantly increased, the cell pyroptosis rate and concentrations of IL-1β, IL-6, IL-18 and TNF-α in the supernatant were decreased, and the expression of ZBP1, RIPK1, caspase-1 and GSDMD was down-regulated in group LPS-ATP+ siRNA ( P<0.05). Compared with group LPS-ATP+ DMSO, the cell survival rate was significantly increased, the cell pyroptosis rate and concentrations of IL-1β, IL-6, IL-18 and TNF-α in the supernatant were decreased, the expression of ZBP1, caspase-1 and GSDMD was down-regulated ( P<0.05), and no significant change was found in the expression of ZBP1 in group LPS-ATP+ nec-1 ( P>0.05). Conclusions:Activation of ZBP1/RIPK1 signaling pathway is involved in LPS-ATP-induced pyroptosis in macrophages of mice.