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目的:探讨巨噬细胞移动抑制因子（macrophage migration inhibitory factor, MIF）在小鼠重症急性胰腺炎（severe acute pancreatitis, SAP）相关肺损伤中的作用。方法:32只小鼠随机（随机数字法）分为4组（每组8只）：野生型对照组（WT+CON组）、野生型SAP组（WT+SAP组）、MIF基因敲除对照组（KO+CON组）、MIF基因敲除SAP组（KO+SAP组）。通过腹腔注射L-精氨酸（4 mg/g）制备SAP模型。在末次注射后72 h取材，通过ELISA检测血清淀粉酶（AMY）、白细胞介素-6（IL-6）、肿瘤坏死因子-α（TNF-α）、MIF表达，通过HE染色观察胰腺组织及肺组织病理变化，通过免疫组化检测肺组织中IL-6、TNF-α表达，通过Western blot检测肺组织核因子κB（NF-κB）表达。计量资料两组间比较采用n t检验，多组比较采用单因素方差分析。n 结果:与WT+CON组相比，WT+SAP组小鼠胰腺及肺组织损伤病理评分、AMY，血清及肺组织TNF-α、IL-6表达明显增高（n P<0.05），而KO+SAP组以上指标水平明显减低（n P<0.05）。此外，KO+SAP组肺组织中NF-κB蛋白表达较WT+SAP组显著降低（n P<0.05）。n 结论:敲除MIF基因可减轻小鼠SAP相关肺损伤，其作用机制可能与NF-κB有关。“,”Objective:To investigate the role of macrophage migration inhibitory factor (MIF) in severe acute pancreatitis (SAP) associated lung injury in mice.Methods:Totally 32 mice were randomly divided into 4 groups (n n=8/per group): wild type control group (WT+CON group), wild type SAP group (WT+SAP group), MIF gene knockout control group (KO+CON group), and MIF gene knockout SAP group (KO+SAP group). SAP model was established by intraperitoneal injection of L-arginine (4 mg/g). The expression of serum amylase, IL-6, TNF-α and MIF were detected by ELISA. The pathological changes of pancreatic and lung tissues were observed by HE staining. The expression of IL-6 and TNF-α in lung tissue was detected by immunohistochemistry. The expression of NF-κB in lung tissue was detected by Western blot. For measurement data,n t test was used for comparison between two groups, and one-way analysis of variance was used for comparison between multiple groups.n Results:Compared with the WT+CON group, pathological score of pancreatic and lung injury, serum amylase, TNF-α and IL-6 expression in serum and lung tissues were significantly increased in the WT+SAP group (n P<0.05), while the above indexes were significantly decreased in the KO+SAP group (n P<0.05). In addition, the expression of NF-κB protein in KO+SAP group was significantly lower than that in the WT+SAP group (n P<0.05).n Conclusions:MIF gene knockout can alleviate severe acute pancreatitis associated acute lung injury in mice, and its mechanism may be related to NF-κB.