摘要
目的观察机械通气致大鼠肺损伤时肺组织及血MDA和SOD含量变化,探讨氧化应激在大鼠急性肺损伤发病机制中的作用。方法24只SD雄性大鼠随机分为自主呼吸组(A组)和机械通气组(B组),每组12只。A组采用自主呼吸,B组采用大潮气量机械通气。于通气后4 h放血处死动物,收集肺组织和肺灌洗液标本,测定肺灌洗液中蛋白总量、白细胞计数和肿瘤坏死因子α(TNF-α);测肺湿/干重比(W/D);测定肺组织和血中MDA及SOD含量;取肺组织观察病理变化。结果与A组相比,B组肺灌洗液中白细胞计数、TNF-α和蛋白总量明显增加(P<0.01);肺组织和血中MDA含量上升,SOD含量下降(P<0.01);肺W/D增加(P<0.01)。肺组织出现明显病理组织学损伤。结论机械通气致急性肺损伤时肺组织发生了强烈的氧化应激损伤,同时伴有机体抗氧化能力相对不足。
Objective To observe changes of MDA and SOD levels, and to study the effect of oxidative stress reaction in pathogenesis of ventilator - induced lung injury (VILI) in rats. Methods Twenty - four male Sprague - Dawley rats were randomly divided into two groups (n = 12 each) : group A received room air without mechanical ventilation, group B received large tidal volume with mechanical ventilation. After 4 h of ventilation, rats were sacrificed and the lung lavage liquid and lung tissue were collected and stored with correct methods. The measured indexes include total protein, WBC and TNF-α in bronchoalveolar lavage fluid (BALF), Wet- to- dry weight ratio (W/D) of lung, the levels of MDA, SOD in the blood and homogenate of harvested lung were assayed respectively. Lung pathological change was observed by microscope. Results Total protein, TNF -α and WBC in BALF and the levels of MDA in the lung and blood of group B were markedly higher than those of Group A (P 〈0.01 ). The levels of SOD in the lung and blood of group B were significantly lower than those of group A ( P 〈 0.01 ). Conclusion Strong oxidative stress is found in lung tissues of rats with VILI, and body's anti - oxidative stress abilities is deficient relatively at the same.
出处
《徐州医学院学报》
CAS
2009年第1期1-3,共3页
Acta Academiae Medicinae Xuzhou
基金
江苏省科技厅社会发展基金(BS2005019)
关键词
肺损伤
机械通气
丙二醛
超氧化物歧化酶
大鼠
lung injury
mechanical ventilation
maleie dialdehyde
superoxide dismutase
rat