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缺血再灌注损伤(ischemia and reperfusion injury, IRI)是指在缺血的基础上恢复血流后,组织器官的损伤反而加重的病理生理现象[1]。肝脏缺血再灌注损伤(liver ischemia and reperfusion injury, LIRI)以肝细胞缺血坏死为特征,临床上主要见于肝部分切除术、肝移植、创伤和低血容量性休克等[2]。但目前临床上针对LIRI的防治仅是支持疗法,因此,寻找防治LIRI的有效手段具有重要临床意义。
白细胞介素(IL)-33最近被鉴定为孤儿受体ST2(IL-1RLI)的配体,除了表达在淋巴器官的高内皮静脉细胞核外,还组成性地表达于正常人的血管内皮细胞、消化系统的上皮细胞以及淋巴组织纤维细胞[2]。IL-33在疾病中扮演双重角色:它通过增强Th2型反应保护机体免受寄生虫感染和动脉粥样硬化,同时也能加重由Th2细胞和肥大细胞介导的炎症性疾病[3]。但IL-33在肝脏缺血再灌注(I/R)中的作用未见报道。本研究将探讨IL-33在小鼠LIRI中的作用及可能机制。现作报道。
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本研究检测了小鼠缺血60 min,再灌注24 h血清中及肝脏组织表达IL-33的情况。小鼠缺血60 min,再灌注3 h后血清中IL-33开始明显升高(P < 0.05),12 h达高峰,24 h后逐渐下降(见图 1)。免疫组化结果显示,IL-33在小鼠缺血60 min,再灌注3 h后表达升高,一直持续至24 h(IL-33阳性细胞显示为棕色)(见图 2)。
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小鼠缺血60 min再灌注12 h,PBS+I/R组血清ALT及AST含量明显高于Sham组(P < 0.01)。在缺血60 min,再灌注12 h,rIL-33+I/R组血清中ALT及AST水平明显低于PBS+I/R组(P < 0.01) (见表 1)。
分组 ALT AST Sham组 50.2±18.1 57.2±18.9 PBS+I/R组 4 842.0±624.1** 5 434.8±1 180.7** rIL-33+I/R组 2 789.6±280.8**## 3 542.6±761.2**# F 554.93 169.65 P < 0.01 < 0.01 MS组内 42 156 225.687 42 657 945.047 q检验:与Sham组比较**P < 0.01;与PBS+I/R组比较##P < 0.01 表 1 小鼠I/R 12 h后各组血清ALT及AST变化(ni=15;U/L)
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HE染色显示Sham组肝组织肝细胞形态正常,肝小叶结构正常(见图 3)。与Sham组相比,PBS+I/R组在缺血60 min再灌注12 h后,肝脏组织结构明显紊乱,肝脏有大面积缺血坏死,肝细胞明显肿胀,变性,坏死区有炎性细胞浸润;rIL-33+I/R组小鼠肝脏损伤较PBS+I/R组明显减轻。
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结果显示:与Sham组相比,PBS+I/R组在缺血60 min,再灌注12 h后肝脏组织MPO含量明显升高(P < 0.01);rIL-33+I/R组较PBS+I/R组在缺血60 min,再灌注12 h后肝脏组织MPO含量明显降低(P < 0.01)(见表 2)。上述结果提示,rIL-33+I/R组较PBS+I/R组在小鼠肝脏缺血60 min,再灌注12 h后中性粒细胞浸润明显减少。
分组 MPO F P MS组内 Sham组 9.77±2.13 PBS+I/R组 23.18±4.31** 31.03 < 0.01 21.744 rIL-33+I/R组 16.76±6.49**## q检验:与Sham组比较**P < 0.01;与PBS+I/R组比较##P < 0.01 表 2 小鼠I/R 12 h各组肝脏组织MPO含量(ni=15;U/g)
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结果显示,小鼠肝脏缺血60 min, 再灌注12 h PBS+I/R组血清中IL-17A含量较Sham组明显升高(P < 0.01), rIL-33+I/R组较PBS+I/R组在小鼠肝脏缺血60 min,再灌注12 h后血清中IL-17A含量明显减少(P < 0.01)(见表 3)。
分组 IL-17A F P MS 组内 Sham组 6.68±3.61 PBS+I/R组 65.44±20.7** 63.08 < 0.01 211.949 rIL-33+I/R组 26.87±13.94**## q检验:与Sham组比较**P < 0.01;与PBS+I/R组比较##P < 0.01 表 3 小鼠肝脏I/R 12 h血清中IL-17A表达(ni=15;pg/mL)
IL-33预处理对小鼠肝脏缺血再灌注损伤的保护作用
Protective effect of IL-33 preconditioning on hepatic ischemia reperfusion injury in mice
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摘要:
目的探讨白细胞介素(IL)-33预处理在小鼠肝脏缺血再灌注中的作用及可能机制。 方法将45只雄性C57BL/6小鼠随机分为3组,每组15只:对照组即肝脏缺血再灌注组(PBS+I/R组),静脉注射等量磷酸盐缓冲液,1 h后分离支配肝脏左、中、尾叶的肝动脉和门静脉及胆管, 应用无损伤微血管夹阻断以上血管60 min;实验组即重组白细胞介素(IL-33)预处理组(rIL-33+I/R组),静脉注射重组IL-33蛋白(每只5 μg),1 h后分离上述血管并夹闭60 min;假手术组(Sham组)小鼠除了不夹闭无损伤微血管夹外其余处理同对照组;每组小鼠再均分为3个亚组,每组5只,分别于再灌注6 h、12 h及24 h检测血清丙氨酸氨基转移酶(ALT)、天门冬氨酸氨基转移酶(AST)及IL-17A水平;另将30只同型小鼠随机分为6组,分别测定不同时段缺血肝脏组织IL-33及髓过氧化物酶(MPO)表达。 结果在小鼠肝脏缺血再灌注过程中,IL-33的表达明显升高。再灌注后12 h,PBS+I/R组小鼠血清ALT、AST含量较Sham组明显升高(P < 0.01),rIL-33+I/R组血清ALT、AST含量较PBS+I/R组明显降低(P < 0.01);HE染色提示rIL-33+I/R组肝细胞损伤、中性粒细胞浸润、肝脏组织MPO含量明显低于PBS+I/R组(P < 0.01);ELISA检测血清IL-17A含量提示rIL-33+I/R组明显低于PBS+I/R组(P < 0.01)。 结论IL-33在小鼠肝脏缺血再灌注过程中起到保护作用,其机制可能与其抑制IL-17A的表达,减少中性粒细胞浸润有关。 Abstract:Objective To explore the effects of interleukin(IL)-33 preconditioning on hepatic ischemia reperfusion in mice, and its possible mechanism. MethodsForty-five male C57BL/6 mice were randomly divided into the sham operation group(Sham group), ischemia and reperfusion injury group(PBS+I/R group, control group) and IL-33+ischemia and reperfusion injury group(rIL-33+I/R group)(15 mice each group).The hepatic artery and portal vein and bile duct of left, middle and caudate lobe of liver in control group were separated, and blocked using no injury microvascular clip for 60 min after 1 h of intravenous injection of the same amount of phosphate buffer.The hepatic artery and portal vein and bile duct of left, middle and caudate lobe of liver in experimental group(rIL-33+I/R group) were separated, and blocked using no injury microvascular clip for 60 min after 1 h of intravenous injection of recombinant IL-33 protein.The treatment of the sham operation group(Sham group) was the same as the control group except for no using no injury microvascular clip.Each group was divided into three subgroups(5 mice each subgroup), the serum levels of ALT, AST and IL-17, and expression levels of IL-33 and myeloperoxidase(MPO) in ischemic liver tissue were detected after 6 h, 12 h and 24 h of reperfusion. Results The expression of IL-33 in muse liver significantly increased during liver ischemia and reperfusion.After 12 h of reperfusion, the serum levels of ALT and AST in PBS+I/R group significantly increased compared with the Sham group(P < 0.01), and the serum levels of ALT and AST in rIL-33+I/R group significantly decreased compared with the PBS+I/R group(P < 0.01).The Results of HE staining in rIL-33+I/R group showed that the hepatocyte damaged, the neutrophil infiltration was found, and the MPO content in liver tissue was significantly lower than that in PBS+I/R group(P < 0.01).The Results of ELISA showed that the serum levels of IL-17A in rIL-33+I/R group was significantly lower than that in PBS+I/R group(P < 0.01). Conclusions IL-33 can protect the hepatic ischemia reperfusion injury in mouse, the mechanism of which may be related to the inhibition of IL-17A expression and reduction of neutrophil infiltration. -
Key words:
- ischemia and reperfusion injury /
- interleukin /
- neutrophil
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表 1 小鼠I/R 12 h后各组血清ALT及AST变化(ni=15;U/L)
分组 ALT AST Sham组 50.2±18.1 57.2±18.9 PBS+I/R组 4 842.0±624.1** 5 434.8±1 180.7** rIL-33+I/R组 2 789.6±280.8**## 3 542.6±761.2**# F 554.93 169.65 P < 0.01 < 0.01 MS组内 42 156 225.687 42 657 945.047 q检验:与Sham组比较**P < 0.01;与PBS+I/R组比较##P < 0.01 表 2 小鼠I/R 12 h各组肝脏组织MPO含量(ni=15;U/g)
分组 MPO F P MS组内 Sham组 9.77±2.13 PBS+I/R组 23.18±4.31** 31.03 < 0.01 21.744 rIL-33+I/R组 16.76±6.49**## q检验:与Sham组比较**P < 0.01;与PBS+I/R组比较##P < 0.01 表 3 小鼠肝脏I/R 12 h血清中IL-17A表达(ni=15;pg/mL)
分组 IL-17A F P MS 组内 Sham组 6.68±3.61 PBS+I/R组 65.44±20.7** 63.08 < 0.01 211.949 rIL-33+I/R组 26.87±13.94**## q检验:与Sham组比较**P < 0.01;与PBS+I/R组比较##P < 0.01 -
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