妊娠期脂多糖接触激活体内TLR4信号通路引起胚胎脑内炎症应激

目的: 观察孕鼠腹腔脂多糖 (LPS) 注射后母体外周血单个核细胞 (PBMNC) 上Toll样受体4 (TLR4) 信号通路激活情况和胚胎脑组织中炎症性细胞因子的水平。方法: 10.5 d孕鼠腹腔注射LPS 0、3、6、12、24、48 和72 h后,通过蛋白免印迹测定孕鼠PBMNC 上TLR4、分化抗原14 (CD14)、髓样分化蛋白2 (MD-2)、p65和p50蛋白水平,Luminex 100免疫荧光法测定孕鼠血清、羊水、脑组织及胚胎脑组织细胞因子TNF-α、IL-1β和IL-10蛋白水平,实时RT-PCR测定孕鼠PBMNC和胚胎脑组织TNF-α、IL-1β和IL-10 mRNA水平。结果: LPS腹腔注射诱导激活孕鼠PBMNC上TLR4信号通路,TLR4、CD14和MD-2蛋白水平短暂增高,核因子κB (NF-κB) 激活片段p65 和p50蛋白水平增高,TNF-α、IL-1β和IL-10 mRNA水平增高(P<0.01);孕鼠外周血和羊水TNF-α、IL-1β和IL-10水平短暂增高(P<0.01),脑内IL-1β蛋白水平短暂升高(P<0.01);胚胎脑内TNF-α和IL-1β蛋白和mRNA水平显著增高(P<0.01)。结论: 妊娠期母体LPS接触可激活母体外周免疫细胞TLR4信号通路,引发胚胎脑内炎症应激状态,可能增加出生后相关疾病的发生风险。

Maternal exposure to lipopolysaccharide induces TLR4 signaling activation and embryonic brain inflammatory stress in gravid rats

AIM: To observe the signaling activation of Toll-like receptor 4(TLR4) in peripheral blood mononuclear cells(PBMNC) of gravid rats and inflammatory cytokine response in embryonic brains following maternal exposure to lipopolysaccharide(LPS).METHODS: Timed-pregnant rats at embryonic day 10.5(E10.5) were intraperitoneally injected with LPS(10 000 endotoxin unit/kg).The PBMNC,serum and amniotic fluid(AF) in gravid rat,and fetal brain were harvested 0 h,3 h,6 h,12 h,24 h,48 h and 72 h after LPS administration.W...