机械性创伤致急性肺损伤大鼠血清肿瘤坏死因子α的动态变化和机制

摘要

目的 探讨血清肿瘤坏死因子α(TNF-α)在机械性创伤致急性肺损伤大鼠中的动态变化和机制.方法 将雄性Wistar大鼠40只完全随机分为伪创伤组和创伤组、伪急性肺损伤组和急性肺损伤组,每组10只,利用Noble-Collip创伤仪制备机械性创伤模型,腹腔注射TNF-α制作急性肺损伤模型.全部大鼠均于造模后6 h腹主动脉采血处死,采用ELISA法测定血清TNF-α含量,肺组织行常规组织病理学检查.结果 创伤组大鼠血清TNF-α含量明显高于伪创伤组[(335±28)mg/L比(177±10)ng/L],差异有统计学意义(P＜0.01).病理结果 显示:创伤组和急性肺损伤组肺组织炎症非常明显,而伪创伤组和伪急性肺损伤组基本正常.结论 机械性创伤大鼠血清中TNF-α含量的升高可能与机械性创伤后急性肺损伤有关.动态观察机械性创伤后血清中TNF-α的变化,有助于病情的评估及预后判断,具有重要的临床意义.%Objective To determine the dynamic changes and mechanism of tumor necrosis factor-α(TNF-α) in serum in acute lung injury(ALI) induced by mechanical trauma in mechanical trauma rat model. Methods Totally 40 male Wistar rats were randomly divided into sham group and trauma group, sham-acute lung injury group and acute lung injury group. Noble-Collip drum was used to establish mechanical trauma rat model. Intraperitoneal injection of TNF-α established acute lung injury model. All rats after modeling of abdominal aortic blood sampling time points were killed and the serum levels of TNF-α were asasyed by ELISA. Results Serum TNF-α levels (334. 78 ±± 28) ng/L in the trauma group were significantly higher than those in the sham group( 177 ±10 ) ng/L (P ＜0. 01 ). The pathological results showed that both in trauma group and acute lung injury group lung infection were very obvious, while it was basically normal in both sham group and sham-acute lung injury group. Conclusions Serum TNF-αt levels of mechanical trauma may be associated with acute lung injury after mechanical trauma. Therefore, dynamic observation of the change of serum TNF-α after mechanical trauma will help the assessment and prognosis of the disease, it has important clinical significance.