Effect of phosphoglycerate mutase 5 mediated pyroptosis on liver ischemia-reperfusion injury
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摘要:
目的 研究磷酸甘油酸变位酶5(PGAM5)调控细胞焦亡在肝脏缺血-再灌注损伤(IRI)中的作用及分子机制。 方法 建立C57小鼠肝脏IRI模型,随机分别予再灌注6 h(6 h组)与12 h(12 h组),并设立假手术组(Sham组),每组10只。分析IRI对小鼠肝组织及血清学指标的影响; 分析小鼠肝脏IRI过程中PGAM5、半胱氨酸天冬氨酸蛋白酶(Caspase)-1的表达情况。建立肝细胞IRI模型(IRI组),采用Caspase-1抑制剂Z-YVAD-FMK预处理后再建立肝细胞IRI模型(抑制剂组),将未处理的AML12细胞作为对照组,分析抑制Caspase-1活性对细胞焦亡的影响。采用脂质体3000将PGAM5小干扰核糖核酸(siRNA)(siRNA组)和siRNA阴性对照(siRNA-NC)(siRNA-NC组)转染至AML12细胞,再建立肝细胞IRI模型,将未处理的AML12细胞作为对照组,分析PGAM5调控细胞焦亡对肝细胞IRI的影响。 结果 6 h组和12 h组小鼠肝组织中部分肝细胞水肿,肝窦区变窄,中央静脉充血,偶见点灶状坏死等,且12 h组较6 h组病变加重。与Sham组小鼠比较,6 h组和12 h组小鼠血清丙氨酸转氨酶(ALT)、天冬氨酸转氨酶(AST)水平升高,且12 h组高于6 h组; 6 h组和12 h组肿瘤坏死因子(TNF)-α、白细胞介素(IL)-1β水平升高,12 h组低于6 h组; 6 h组和12 h组小鼠肝组织IL-1β信使核糖核酸(mRNA)相对表达量升高,12 h组低于6 h组; 6 h组和12 h组肝组织细胞凋亡率升高,12 h组低于6 h组(P < 0.01~0.05)。与Sham组小鼠比较,6 h组和12 h组小鼠肝组织PGAM5 mRNA相对表达量和蛋白相对表达量均升高,且12 h组高于6 h组(P < 0.01~0.05);6 h组和12 h组肝组织PGAM5、Caspase-1蛋白表达增多。IRI组细胞NOD样受体蛋白3(NLRP3)、裂解Caspase (cleaved Caspase)-1及Gasdermin D(GSDMD)蛋白相对表达量较对照组升高,GSDMD荧光强度较对照组增强; 抑制剂组NLRP3、cleaved Caspase-1及GSDMD蛋白相对表达量较IRI组下降,GSDMD荧光强度较IRI组减弱(P < 0.01~0.05)。与对照组比较,siRNA-NC组细胞存活率下降,PGAM5、NLRP3、cleaved Caspase-1、GSDMD蛋白相对表达量升高(P < 0.01~0.05);与siRNA-NC组比较,siRNA组细胞存活率升高,PGAM5、NLRP3、cleaved Caspase-1、GSDMD蛋白相对表达量下降(P < 0.01~0.05)。 结论 PGAM5可加重小鼠肝脏IRI,其机制可能为通过PGAM5/Caspase-1/GSDMD信号通路调控细胞焦亡,加速肝细胞损伤。 -
关键词:
- 细胞焦亡 /
- 肝移植 /
- 缺血-再灌注损伤(IRI) /
- 磷酸甘油酸变位酶5(PGAM5) /
- 半胱氨酸天冬氨酸蛋白酶(Caspase)-1 /
- NOD样受体蛋白3(NLRP3) /
- 肿瘤坏死因子(TNF)-α /
- 白细胞介素(IL)-1β
Abstract:Objective To investigate the effect and its molecular mechanism of phosphoglycerate mutase 5 (PGAM5) mediated pyroptosis on liver ischemia-reperfusion injury (IRI). Methods C57 mouse models of liver IRI were established and randomly divided into the 6 h reperfusion (6 h group) and 12 h reperfusion (12 h group), and sham operation group (sham group) was established too, 10 rats in each group. The effect of IRI on the parameters in the liver tissues and serum samples was evaluated. The expression levels of PGAM5 and cysteinyl aspartate specific proteinase (Caspase)-1 in the liver tissues during IRI were quantitatively detected. The IRI models of liver cells were established (IRI group). The IRI models of liver cells were established after pretreatment with Caspase-1 inhibitor Z-YVAD-FMK (inhibitor group). The untreated AML12 cells were allocated into the control group. The effect of inhibiting Caspase-1 activity on pyroptosis was analyzed. AML12 cells were transfected with PGAM5 small interfering ribonucleic acid (siRNA) (siRNA group) and siRNA-negative control (siRNA-NC) (siRNA-NC group) by liposome 3000, and then IRI models of liver cells were established. The untreated AML12 cells were assigned into the control group. The effect of PGAM5 mediated pyroptosis on IRI of liver cells was assessed. Results In the 6 h and 12 h groups, partial liver cell edema, hepatic sinusoid narrowing, central vein congestion and occasional spot necrosis were observed in the mouse liver tissues, and these changes in the 12 h group were more aggravated than those in the 6 h group. The serum levels of alanine aminotransferase (ALT) and aspartate aminotransferase (AST) in the 6 h and 12 h groups were higher than those in the sham group, and the values in the 12 h group were higher than those in the 6 h group. The levels of tumor necrosis factor (TNF)-α and interleukin (IL)-1β were increased in the 6 h and 12 h groups, and the values in the 12 h group were lower than those in the 6 h group. The relative expression levels of IL-1β messenger ribonucleic acid (mRNA) in the mouse liver tissues in the 6 h and 12 h groups were up-regulated, and the value in the 12 h group was lower than that in the 6 h group. The cell apoptosis rates in the liver tissues were significantly increased in the 6 h and 12 h groups, and the value in the 12 h group was remarkably lower than that in the 6 h group (P < 0.01-0.05). Compared with the sham group, the relative expression levels of PGAM5 mRNA and protein in the mouse liver tissues in the 6 h and 12 h groups were significantly up-regulated, and the values in the 12 h group were significantly higher than those in the 6 h group (P < 0.01-0.05). The protein expression levels of PGAM5 and Caspase-1 in the liver tissues were up-regulated in the 6 h and 12 h groups. Compared with the control group, the relative expression levels of NOD-like receptor protein 3 (NLRP3), cleaved Caspase-1 and Gasdermin D (GSDMD) proteins were up-regulated and the fluorescence intensity of GSDMD was increased in the IRI group. Compared with the IRI group, the relative expression levels of NLRP3, cleaved Caspase-1 and GSDMD proteins were significantly down-regulated and the fluorescence intensity of GSDMD was considerably decreased in the inhibitor group (P < 0.01-0.05). Compared with the control group, the cell survival rate was significantly decreased, and the relative expression levels of PGAM5, NLRP3, cleaved Caspase-1 and GSDMD proteins were significantly up-regulated in the siRNA-NC group (P < 0.01-0.05). Compared with the siRNA-NC group, the cell survival rate was remarkably increased, whereas the relative expression levels of PGAM5, NLRP3, cleaved Caspase-1 and GSDMD proteins were significantly down-regulated in the siRNA group (P < 0.01-0.05). Conclusions PGAM5 may aggravate the liver IRI in mouse models probably by mediating pyroptosis via PGAM5/Caspase-1/GSDMD signaling pathway and aggravating liver cell injury. -
图 1 各组小鼠肝组织和血清学指标的表现
注:A图示各组小鼠肝组织病理学表现(HE,×200);B图示各组小鼠血清ALT水平; C图示各组小鼠血清AST水平; D图示各组小鼠血清TNF-α水平; E图示各组小鼠血清IL-1β水平; F图示各组小鼠肝组织IL-1β mRNA相对表达量; G、H图示各组小鼠肝组织中细胞凋亡水平(TUNEL,×200)。与Sham组比较,aP < 0.01;与6 h组比较,bP < 0.05,cP < 0.01。
Figure 1. Manifestations of the indexes of liver tissues and serology of mice in each group
图 4 各组肝细胞存活及PGAM5/Caspase-1/GSDMD信号通路蛋白表达情况
注:A图示各组细胞存活率; B图示各组细胞PGAM5、NLRP3、cleaved Caspase-1及GSDMD蛋白相对表达量; C图示各组细胞GSDMD蛋白的表达与分布(免疫荧光,×200)。与对照组比较,aP < 0.05,bP < 0.01;与siRNA-NC组比较,cP < 0.05,dP < 0.01。
Figure 4. Survival and protein expression of PGAM5/Caspase-1/GSDMD signaling pathway in hepatocytes in each group
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