粒细胞NADPH氧化酶在犬烟雾吸入伤中的变化及意义

本实验利用犬烟雾吸入伤模型。观察了致伤前后粒细胞NADPH氧化酶活性的变化,显示其伤后活性增加,提示粒细胞及其活性氧代谢产物参与了犬烟雾吸入性肺损伤的发生发展,同时观察了血气、病检,肺含水量等指标,证实动物存在严重吸入性肺损伤。

The Changes of Neutrophil NADPH Oxidase after Smoke Inhalation Injury and Their Significance in Dogs

The canine model to study inhalaton injury established in our lab was employed,and neutrophil NADPH oxidase activity,blood gas analysis,lung water volume,chest radiographs,and pulmonary histopathological changes were observed in the dogs after they were exposed to smoke inhalaton.It was found that carbon monoxide poisoning,hypoxemia,metabolic aci-dosisi respiratory alkalosis and lung damage developed rapidly and early after smoke inhalation;white blood cells disappeared from the circulation 5 minutes after injury onward;the activity of neutrophil NADPH oxidase increased gradually from the 30th minute to the 6th hour after injury,then decreased and approached to its preinjury level in the 12th hour after injury.It is postulated on the basis of the above findings that neutrophils would accumulate in the lungs after smoke inhalation and experince a "respiratory burst" characterized by the activation of NADPH oxidase and the production of large amounts of oxygen and other active oxygen radicals,which would play a significant role in the pathogenesis of acute lung damage in the early stage of smoke inhalation injury.