帕立骨化醇通过HMGB1/TLR4/NF-κB信号通路减轻小鼠肠缺血再灌注损伤

目的：观察帕立骨化醇对肠缺血再灌注损伤的影响，并进一步研究其与HMGB1/TLR4/NF-κB信号通路的关系。方法：SPF级健康成年雄性C57BL/6J小鼠24只，采用随机数字表法分为4组（n=6）：假手术组（S组）、帕立骨化醇预处理+假手术组（SP组）、肠缺血再灌注组（IR组）和帕立骨化醇缺血预处理组（P组）。S组与SP组仅分离肠系膜上动脉，IR组与P组建夹闭肠系膜上动脉45 min后再灌注2 h，建立肠缺血再灌注模型；SP组与P组在术前24 h经腹腔注射0.3 μg/kg帕立骨化醇，其余两组给予等体积生理盐水。再灌注2 h时处死小鼠，距回肠末端5 cm取得肠组织，光镜下观察病理结果，根据Chiu's评分标准对肠黏膜损伤进行病理评分；采用ELISA法检测小肠组织二胺氧化酶（DAO）、肿瘤坏死因子α（TNF-α）、白细胞介素6（IL-6）含量；采用Western blot法检测小肠组织高迁移率族蛋白B1（high mobility group protein B1, HMGB1）、Toll样受体4（Toll like receptor 4, TLR4）和NF-κB p65蛋白的表达水平。结果：与S组及SP组相比，IR组及P组小肠Chiu's评分明显上升，IR组肠DAO、TNF-α、IL-6含量及HMGB1、TLR4、NF-κB蛋白表达明显上升（ P<0.05）；与IR组相比，P组Chiu's评分、DAO、TNF-α、IL-6含量及HMGB1、TLR4、NF-κB蛋白表达显著下降（P<0.05）。 结论：帕立骨化醇可减轻肠缺血再灌注损伤，其机制与抑制HMGB1/TLR4/NF-κB信号通路、发挥抗炎作用有关。

Research Progress of Cold Sprayed Ni and Ni-Based Composite Coatings:A Review

AIM: To observe the effect of paricalcitol on intestinal ischemia-reperfusion injury, and to explore the relationship with HMGB1/TLR4/NF-κB signaling pathway. METHODS: Twenty-four SPF-grade healthy adult male C57BL/6J mice were divided into 4 groups (n=6) by random number table: sham operation group (S group), paricalcitol pretreatment+sham operation group (SP group), intestinal ischemia-reperfusion group (IR group) and paricalcitol ischemic preconditioning group (P group). S group and SP group were separated the superior mesenteric artery, IR group and P group were clamped the superior mesenteric artery for 45 minutes and then followed by reperfusion for 2 hours to establish the intestinal ischemia-reperfusion model; SP group and P group were intraperitoneally injected with 0.3 μg/kg paricalcitol 24 hours before surgery, and the other two groups were given equal volume of normal saline. The mice were sacrificed at 2 h after reperfusion, and the intestinal tissue was obtained 5 cm from the terminal ileum. The pathological results were observed under light microscope. The intestinal mucosal injury was scored according to the Chiu's scoring standard. The intestinal tissue diamine oxidase (DAO) and tumor were detected by ELISA. Necrosis factor α (TNF-α) and interleukin 6 (IL-6) content; Western blot was used to detect the expression levels of HMGB1, TLR4 and NF-κB p65 protein in small intestine tissues.RESULTS: Compared with S group and SP group, Chiu's score was increased, the expression of Dao, TNF-α and IL-6 were increased, as well as the expression of HMGB1, TLR4 and NF-κB p65 protein increased significantly in IR group (P<0.05); Compared with IR group, Chiu's score was decreased, the expression of Dao, TNF-α and IL-6 were decreased, as well as the expression of HMGB1, TLR4 and NF-κB p65 protein decreased significantly in P group (P<0.05). CONCLUSION: Paricalcitol can alleviate intestinal ischemia-reperfusion injury by inhibiting HMGB1/TLR4/NF-κB signaling pathway and playing an anti-inflammatory role.