牙龈卟啉单胞菌脂多糖对高脂血症兔腹腔巨噬细胞炎症相关因子基因表达的影响

Effect of Porphyromonas gingivalis lipopolysaccharide on gene expression of inflammatory cytokines in peritoneal macrophages of hyperlipidemic rabbits

目的比较牙龈卟啉单胞菌脂多糖(Porphyromonas gingivalis on lipopolysaccharide,Pg-LPS)对健康和高脂血症兔腹腔巨噬细胞炎症相关因子基因表达的影响。方法将健康新西兰兔12只随机分为2组,分别给予普通饲养喂养(健康兔)和高脂饲料喂养,6周后建立高脂血症模型(高脂兔)。采用腹腔灌洗法分别获得健康和高脂兔巨噬细胞,将健康和高脂兔巨噬细胞均随机分为对照组、Pg-LPS组(1μg/m L)及阳性对照组大肠杆菌-脂多糖(Escherichia,E.coli-LPS)组(1μg/m L),24 h后采用实时PCR法分别检测各组巨噬细胞中C-反应蛋白(C-reaction protein,CRP)、白介素1β(interleukin-1β,IL-1β)、白介素6(interleukin-6,IL-6)、白介素8(interleukin-8,IL-8)、肿瘤坏死因子α(tumor necrosis factor-α,TNF-α)m RNA的表达水平。结果高脂兔对照组巨噬细胞的CRP、IL-1β、IL-6、IL-8、TNF-α水平高于健康兔对照组巨噬细胞;相较于对照组,高脂兔和健康兔Pg-LPS组巨噬细胞的CRP、IL-1β、IL-6、IL-8、TNF-α表达均升高,且高脂兔Pg-LPS组巨噬细胞以上因子的表达水平高于健康兔Pg-LPS巨噬细胞(P<0.05)。结论 Pg-LPS可增强高脂血症兔巨噬细胞炎症相关因子m RNA的表达。

Objective To compare the inflammatory reaction of peritoneal macrophage after Pg-LPS stimulated in healthy rabbit and hyperlipidemia rabbit. Methods 12 New Zealand rabbits were randomly divided into 2 groups with 6 rabbits in each group, and normal diet and high-fat diet were fed to them respectively. The hyperlipidemia model was set up after 6 weeks. The peritoneal macrophage in normal and hyperlipidemia group were isolated and cultured, and then the cells in both groups were respectively divided into 3 groups： control, 1 μg/m L Pg-LPS, and 1 μg/m L E.coli-LPS. After 24 h treatment, the expressions of C-reaction protein（CRP）, interleukin-1β（IL-1β）, interleukin-6（IL-6）, interleukin-8（IL-8）, and tumor necrosis factor-α（TNF-α） were detected by realtime PCR. Results The levels of CRP, IL-1β, IL-6,IL-8, and TNF-α were higher in hyperlipidemia control group than normal control group. The expressions of inflammatory substances were increased after stimulated by Pg-LPS, and statistically higher in hyperlipidemia rabbit group than normal group（P 0.05）. Conclusion Pg-LPS can enhance the m RNA expressions of inflammation related factors in peritoneal macrophage in hyperlipidemia rabbit.