摘要
背景:肺切除、体外循环、肺移植、肺动脉栓塞等病都会造成肺组织缺血再灌注损伤,肺缺血再灌注损伤也是肺移植后肺功能失调的重要因素。目的:分析缺血后处理对肺缺血再灌注损伤模型大鼠的影响。方法:将24只雄性SD大鼠随机分为假手术组、缺血再灌注组和缺血后处理组,每组8只。建立肺缺血再灌注损伤模型,假手术组只分离左肺门和肺动静脉,未阻断;缺血再灌注组肺缺血1 h后再灌注2 h;缺血后处理组于再灌注前给予3次缺血30 s再灌注30 s,然后恢复再灌注2 h。实验后取肺组织标本,检测肺组织湿/干质量比、超氧化物歧化酶、丙二醛和髓过氧化物酶活性,炎症细胞因子肿瘤坏死因子α、白细胞介素1β、白细胞介素6的含量,观察肺组织病理学变化。结果与结论:缺血再灌注组和缺血后处理组肺组织湿/干质量比、丙二醛、髓过氧化物酶活性、肿瘤坏死因子α、白细胞介素1β和白细胞介素6水平与假手术组比较有显著增高(P<0.05),而缺血后处理组增高不明显,与缺血再灌注组比较,含量和活性均降低(P<0.05)。缺血再灌注组和缺血后处理组超氧化物歧化酶活性明显低于假手术组,缺血后处理组明显高于缺血再灌注组。缺血再灌注组肺组织病理检查见肺泡壁增厚,有水肿和大量炎性细胞浸润。缺血后处理组肺泡壁增厚和水肿程度较缺血再灌注组减轻,有部分炎性细胞浸润。肺组织病理学评分,缺血后处理组较缺血再灌注组有所降低。结果提示,缺血后处理可以通过抑制肺缺血再灌注后炎症细胞聚集、氧自由基产生和促炎细胞因子释放,对肺缺血再灌注损伤模型大鼠起到保护作用。
BACKGROUND： Pneumonectomy, extracorporeal circulation, lung transplantation and pulmonary embolism can cause ischemia/reperfusion injury of lung tissue. Lung ischemia/reperfusion injury is an important factor of lung function disorders after lung transplantation. OBJECTIVE： To analyze the effect of ischemic postconditioning on rat models of lung ischemia/reperfusion injury. METHODS： Twenty-four male SD rats were randomly divided into sham, ischemia/reperfusion and ischemic postconditioning groups（n = 8 rats/group） to establish the lung ischemia/reperfusion injury model. The rats in the sham group were only subjected to separation of the hilum of left lung and pulmonary arteries and veins, without blocking. The rats in the ischemia/reperfusion group were subjected to another 2 hours of reperfusion after 1 hour of lung ischemia. The rats in the ischemic postconditioning group were first subjected to 30 seconds of lung ischemia and 30 seconds of reperfusion for three times, and then to 2 hours of reperfusion. After the experiment, the specimens of lung tissue were obtained to detect the wet/dry weight ratio of lung tissue, activities of superoxide dismutase, malondialdehyde and myeloperoxidase, the contents of inflammatory cytokines tumor necrosis factor α, interleukin-1β and interleukin-6, and the histopathological changes of lung tissue were observed. RESULTS AND CONCLUSION： Compared with the sham group, the wet/dry weight ratio of lung tissue, activities of myeloperoxidase and myeloperoxidase, the levels of tumor necrosis factor α, interleukin-1β and interleukin-6were significantly increased（P〈0.05） in the ischemia/reperfusion and ischemic postconditioning groups, however, the increase levels of these indices were not significant in the ischemic postconditioning group, and the contents and activities in the ischemic postconditioning group were all significantly decreased（P〈0.05） compared with those in the ischemia/reperfusion group. In the ischemia/reperfusion and ischemic postconditioning groups, the activity of superoxide dismutase was obviously lower than that in the sham group, however, the activity of superoxide dismutase in the ischemic postconditioning group was obviously higher than that in the ischemia/reperfusion group. Pathological examination showed that thickened alveolar wall, edema and a large amont of inflammatory cell infiltrations were observed in the lung tissue of rats in the ischemia/reperfusion group. The degrees of alveolar wall thickening and edema in the lung tissue of rats in the ischemic postconditioning group were mild compared with the ischemia/reperfusion group, and in addition, some inflammatory cells were infiltrated. The histopathological scores of lung tissue in the ischemic postconditioning group were lower than those in the ischemia/reperfusion group. These results suggest that ischemic postconditioning plays its protective role on rat models of ischemia/reperfusion injury by inhibiting inflammatory cell accumulation, oxygen free radical production and pro-inflammatory cytokine release after ischemia/reperfusion injury.
出处
《中国组织工程研究》
CAS
北大核心
2015年第27期4271-4276,共6页
Chinese Journal of Tissue Engineering Research
