盐酸戊乙奎醚预先给药对新生大鼠内毒素性急性肺损伤时NF-κB活性的影响

目的 探讨盐酸戊乙奎醚预先给药对新生大鼠内毒索性急性肺损伤时NF-kB活性的影响.方法 健康新生Wistar大鼠30只,雌雄不拘,日龄7 d,体重18～21 g,随机分为3组(n=10):对照组(C组)、急性肺损伤组(ALI组)和盐酸戊乙奎醚预先给药组(P组).采用腹腔注射内毒素3 mg/kg的方法制备急性肺损伤模型,P组腹腔注射盐酸戊乙奎醚0.5 mg/kg,30 min后制备模型,C组腹腔注射等容量生理盐水.于腹腔注射内毒素4 h时处死大鼠取肺,称重后计算肺湿,干重比,电镜下观察肺组织病理学结果,采用免疫组织化学法检测NF-kB p65的表达水平,采用酶联免疫吸附法测定TNF-α、IL-1 β及IL-10的含量.结果 与C组比较,ALI 组和P组肺湿/干重比、TNF-α、IL-1β、IL-10含量及NF-KB p65表达水平升高(P＜0.05);与ALI 组比较,P组肺湿/干重比、TNF-α、IL-1β、IL-10含量及NF-kBp65表达水平降低(P＜0.05).病理学结果显示:P组肺组织损伤程度较ALI组明显减轻.结论 盐酸戊乙奎醚预先给药可通过抑制肺组织NF-kB活化,降低炎性反应,减轻新生大鼠内毒素性急性肺损伤.

Effects of penehyclidine pretreatment on nuclear factor kappa B activity during lipopolysaccharide-induced acute lung injury in neonate rats

Objective To investigate the effects of penehyclidine (PHCD) pretreatment on nuclear factor kappa B ( NF-kB ) activity during lipopolysaccharide ( LPS )-induced acute lung injury ( ALl ) in neonate rats.Methods Thirty 7-day old Wistar rats of both sexes weighing 18-21 g were randomly divided into 3 groups ( n =10 each): group Ⅰ control (group C); group Ⅱ LPS; group Ⅲ PHCD. Group Ⅱ and Ⅲ received intraperitoneal ( group IP) LPS 3 mg/kg. In group Ⅲ PHCD 5 mg/kg was administered IP at 30 min before LPS respectively. The animals were killed at 4 h after LPS administration. The lungs were immediately removed. The W/D lung weight ratio was measured. The TNF-α, IL-1 βand IL-10 content in the lung were detected by ELISA and expression of NF-kB p65 was detected by immuno-histochemical staining.Results LPS significantly increased W/D lung weight ratio, TNF-α, IL-1 β, IL-10 content and NF-kB p65 expression in the lung as compared with control group. PHCD administered before LPS significantly attenuated the LPS-induced changes. Electron microscopy showed that PHCD before LPS significandy ameliorated the LPS-induced histological damages. Conclusion Pretreatment with PHCD can attenuate LPS-induced acute lung injury though inhibition of NF-kB activation and inflammatory response of lung tissue in neonate rats.