目的：探讨氯膦酸二钠脂质体（LC）对大鼠重症急性胰腺炎（SAP）肺损伤的影响及与Akt、MAPK（ERK1/2）通路的关系。方法：将48 只SD 大鼠随机均分为假手术组、SAP 模型组（模型组）、SAP 模型+LC 处理组（LC 组），后两组采用膜下注射5% 牛磺胆酸钠制作SAP 模型，并分别于造模后尾静脉注射空白脂质体与LC。各组分别于术后2、6 h 后检测血清淀粉酶（AMS）、IL-6、TNF-α 的含量，观察肺组织病理学变化，及肺组织中Akt 和MAPK（ERK1/2）的表达。结果：与假手术组比较，模型组与LC 组血清AMS、IL-6 及TNF-α 含量、肺组织病理学评分，肺组织Akt 和MAPK（ERK1/2）表达水平均明显升高，且均随时间延长而更加明显（均P<0.05），但LC 组的上述指标在各时间点上均明显低于模型组（均P<0.05）。结论：LC 有减轻大鼠SAP 肺损伤的作用，机制可能与肺泡巨噬细胞吞噬LC 后，Akt 和MAPK（ERK1/2）信号通路抑制，从而减少炎症细胞因子的释放有关。
Alleviative effect of liposomal clodronate against lung injury in rats with severe acute pancreatitis and its relations with Akt and MAPK (ERK1/2) pathways
Objective: To investigate the effect of liposomal clodronate(LC) on lung injury secondary to severe acute pancreatitis (SAP) in rats and its relations with Aktand MAPK (ERK1/2) pathways. Methods: Forty-eight SD rats were equally randomized into sham operation group, SAP model group (model group) and SAP model plus LC treatment group (LC group), and in the latter two groups, SAP model was created by injection of 5% sodium taurocholate beneath the pancreatic capsule, and after that were given naked liposome and LC respectively by tail vein injection. In each group at 2 and 6 h after operation, the serum levels of amylase (AMS), IL-6, and TNF-αwere measured, and pathological changes, as well as Akt and MAPK (ERK1/2) expressions in the lung tissue were observed. Results: In both model group and LC group compared with sham operation group, the serum levels of AMS, IL-6 and TNF-α,the pathological score, and the expression levels of Akt and MAPK (ERK1/2) were significantly increased, and all became evident as time went on (all P<0.05), but all above parameters in LC group were significantly lower than those in model group at each time point (all P<0.05). Conclusion: LC has alleviative effect against SAP-induced lung injury in rats, and the mechanism may be associated with reduced inflammatory factors that result from inhibition of Akt and MAPK (ERK1/2) signaling pathways after LC uptake by alveolar macrophages.