IL-10抗内毒素气管内滴注致急性肺损伤作用的实验研究关

目的:探讨中性粒细胞(PMN)在急性肺损伤(ALI)发生中的作用及IL-10对ALI的拮抗作用。方法: 用LPS(100 μg/只)或LPS+IL-10(1 μg/只)向SD大鼠气管内滴注复制ALI模型,检测支气管肺泡灌洗液(BALF)中PMN数目、蛋白质及丙二醛(MDA)含量,并进行组织学观察。结果: LPS气管内滴注可引起BALF中PMN数目明显增加,伴有蛋白质及MDA含量的增高,光镜观察显示肺组织间隙弥漫性炎细胞浸润。LPS+IL-10组则BALF中PMN数目、蛋白质及MDA含量显著低于LPS组,肺组织中PMN浸润程度也明显轻。结论: PMN在ALI发病中具有重要作用。IL-10能够拮抗LPS所致ALI的发生。

Effect of interleukin-10 on attenuating endotoxin-induced acute lung injury

AIM: To study the role of polymorphonuclear neutrophile(PMN) in lipopolysaccharide (LPS)- induced acute lung injury (ALI) and the protective effect of interleukin -10(IL-10) on ALI. METHODS: LPS alone (100μg) or LPS+ IL-10 (l ug) was instilled intratracheally into rats. PMN numbers, protein content and malondialdehyde (MDA) content in bronchoalveolar lavage fluid (BALF) were measured. Histological change of lung was also observed. RESULTS: LPS increased significantly PMN numbers, protein content and MDA content in BALF. Histological finding shows PMN accumulation in lung. IL - 10+LPS reduced remarkably PMN numbers ,pro- tein content and MDA content in BALF than those caused by LPS. PMN decreasing was also identified by light microscopy. CONCLUSION: LPS instilled intratracheally causes PMN accumulation in lung and ALI, while IL - 10 could alleviate ALI through reducing PMN accumulation.