蟛蜞菊内酯对肺炎链球菌感染的肺泡上皮细胞凋亡及炎症因子分泌的调节作用

Effects of wedelobata on apoptosis and secretion of inflammatory cytokines in the alveolar epithelium infected by Streptococcus pneumonia

目的分析蟛蜞菊内酯对肺炎链球菌感染的肺泡上皮细胞凋亡及炎症因子分泌的调节作用。方法将肺泡上皮细胞A549分为感染组(1×108/CFU/mL的肺炎链球菌培养细胞)、对照组(不作处理)、感染+蟛蜞菊内酯低剂量组、中剂量组、高剂量组(10、20、40μmol/L蟛蜞菊内酯预处理,之后采用1×108/CFU/mL的肺炎链球菌培养细胞)。检测细胞凋亡率、凋亡相关蛋白表达量、炎症因子mRNA相对表达量及水平。结果与对照组相比,感染组、感染+蟛蜞菊内酯低剂量组、中剂量组、高剂量组凋亡率、Bax、Caspase-3蛋白表达量、IL-6、IL-1β、TNF-αmRNA相对表达量及水平较高,Bcl-2蛋白表达量较低(P<0.05);与感染组相比,感染+蟛蜞菊内酯低剂量组、中剂量组、高剂量组凋亡率、Bax、Caspase-3蛋白表达量、IL-6、IL-1β、TNF-αmRNA相对表达量及水平较低,Bcl-2蛋白表达量较低,且感染+蟛蜞菊内酯高剂量组凋亡率、Bax、Caspase-3蛋白表达量、IL-6、IL-1β、TNF-αmRNA相对表达量及水平最高,Bcl-2蛋白表达量最低(P<0.05)。结论肺炎链球菌感染的肺泡上皮细胞经蟛蜞菊内酯干预后细胞凋亡率下降,炎症因子分泌减少。

Objective To investigate the regulatory effects of wedelobata on apoptosis and secretion of inflammatory factors in the alveolar epithelial cells infected by Streptococcus pneumoniae.Methods Alveolar epithelial cells A549 were divided into infection group(1×108/CFU/mL cultured cells of Streptococcus pneumoniae),control group(no treatment),infection+wedelolactone low-dose group,middle-dose group and high-dose group(pretreated with wedelolactone at 10,20 and 40μmol/L and then cultured cells of Streptococcus pneumoniae at 1×108/CFU/mL).Alveolar epithelial cells A549 were divided into infection group(1×108/CFU/mL cultured cells of Streptococcus pneumoniae),control group(no treatment),infection+wedelolactone low-dose group,middle-dose group and high-dose group(pretreated with wedelolactone at 10,20 and 40μmol/L and then cultured cells of Streptococcus pneumoniae at 1×108/CFU/mL).Results Compared with control group,the apoptosis rate,the relative expression levels of Bax,Caspase-3 protein,IL-6,IL-1βand TNF-αmRNA were higher in infection group,infection+wedelolide low dose group,medium dose group and high dose group,while the expression level of Bcl-2 protein was lower(P<0.05).Compared with the infected group,the apoptosis rate,the relative expression levels of Bax,Caspase-3 protein,IL-6,IL-1βand TNF-αmRNA and the expression levels of Bcl-2 protein were lower in the infected+wedelolide low dose,medium dose and high dose groups.Moreover,the apop⁃tosis rate,the expression levels of Bax,Caspase-3 protein,IL-6,IL-1βand TNF-αmRNA were the highest in the infected+wedelactone high-dose group,and the expression levels of Bcl-2 protein were the lowest(P<0.05).Conclusion The apoptosis rate of alveolar epithelial cells infected by Streptococcus pneumoniae decreased and the secretion of inflammatory factors decreased after the intervention of wedelia lactone.