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1.河北大学附属医院教育处,保定 071000
2.河北大学附属医院肝胆外科,保定 071000
3.河北大学附属医院心血管内科,保定 071000
田晰晰,Email:cissy_815@126.com,研究方向:急诊医学、医学教育管理。
马 竞,Email:332442964@qq.com。
收稿:2023-11-16,
修回:2024-04-29,
录用:2025-04-01,
纸质出版:2025-08-28
移动端阅览
田晰晰,吴剑飞,韩思梁,等.柠檬苦素调节RIP1/RIP3/MLKL信号通路对心肌梗死大鼠心肌细胞坏死性凋亡的影响[J].重庆医科大学学报,2025,50(8):1096-1102.
Tian Xixi,Wu Jianfei,Han Siliang,et al.Impact of limonin on necrotic apoptosis of myocardial cells in rats with myocardial infarction by regulating the receptor-interacting protein 1/receptor-interacting protein 3/mixed-lineage kinase domain-like protein signaling pathway[J].Journal of Chongqing Medical University,2025,50(8):1096-1102.
田晰晰,吴剑飞,韩思梁,等.柠檬苦素调节RIP1/RIP3/MLKL信号通路对心肌梗死大鼠心肌细胞坏死性凋亡的影响[J].重庆医科大学学报,2025,50(8):1096-1102. DOI: 10.13406/j.cnki.cyxb.003865.
Tian Xixi,Wu Jianfei,Han Siliang,et al.Impact of limonin on necrotic apoptosis of myocardial cells in rats with myocardial infarction by regulating the receptor-interacting protein 1/receptor-interacting protein 3/mixed-lineage kinase domain-like protein signaling pathway[J].Journal of Chongqing Medical University,2025,50(8):1096-1102. DOI: 10.13406/j.cnki.cyxb.003865.
目的
2
探究柠檬苦素(limonin,LIM)调节受体相互作用蛋白激酶-1(receptor-interacting protein 1,RIP1)/受体相互作用蛋白激酶-3(receptor-interacting protein 3,RIP3)/混合谱系激酶结构域样蛋白(mixed-lineage kinase domain-like protein,MLKL)信号通路对心肌梗死(myocardial infarction,MI)大鼠心肌细胞坏死性凋亡的影响。
方法
2
将60只SD大鼠采用随机数字表法分为5组(每组
n
=12):假手术组(Sham组)、MI模型组(Model组)、低剂量LIM组(LIM-L组,25 mg/kg LIM)、高剂量LIM组(LIM-H组,50 mg/kg LIM)和LIM高剂量+Nec-1组(LIM-H+Nec-1组,50 mg/kg LIM+0.6 mg/kg Nec-1)。通过结扎大鼠心脏冠脉的方式构建大鼠MI模型。测定大鼠心功能变化。伊红-苏木精染色(hematoxylin-eosin staining,HE)观察大鼠心肌组织病理学变化。2,3,5-三苯基氯化四氮唑(2,3,5-triphenyltetrazolium chloride,TTC)-伊文斯蓝(evans blue,EB)法检测大鼠心肌梗死面积。末端标记法(terminal-deoxynucleoitidyl transferase mediated nick end labeling,TUNEL)检测大鼠心肌细胞坏死性凋亡情况。实时荧光定量PCR(real time fluorescence quantitative PCR,RT-qPCR)、Western blot实验检测大鼠心肌组织RIP1/RIP3/MLKL信号通路相关mRNA与蛋白的表达及凋亡相关蛋白表达。
结果
2
Model组大鼠较Sham组左室射血分数(left ventricular ejection fraction,LVEF)、左室收缩压(left ventricular systolic pressure,LVSP)、心肌组织B淋巴细胞瘤-2(B-cell lymphoma-2,Bcl-2)表达降低(均
P
<
0.001),左室收缩末期容积(left ventricular end-systolic volume,LVESV)、左室舒张末压(left ventricular end-diastolic pressure,LVEDP)、左室舒张末期容积(left ventricular end-diastolic volume,LVEDV)、心肌梗死面积、细胞凋亡率、心肌组织RIP1、RIP3、MLKL mRNA和蛋白水平、Bcl-2相关X蛋白(Bcl-2 associated X protein,Bax)、胱天蛋白酶3(cysteinyl aspartate-specific proteinase 3,Caspase3)蛋白表达均明显升高(均
P
<
0.001),HE病理切片显示大鼠心肌细胞肿大、排列紊乱,出现坏死和大量炎性细胞浸润。与Model组相比,LIM-H组大鼠相应指标变化与上述相反(RIP1 mRNA:
P
=0.002,RIP3 mRNA:
P
=0.008,其余指标均
P
<
0.001),大鼠心肌组织病理学损伤和炎性细胞浸润减轻。Nec-1促进了LIM对MI大鼠心肌细胞坏死性凋亡的减轻作用。
结论
2
LIM可能通过下调RIP1/RIP3/MLKL信号通路减轻MI大鼠心肌细胞坏死性凋亡。
Objective
2
To investigate the impact of limonin(LIM) on the necrotic apoptosis of myocardial cells in rats with myocardial infarction(MI) by regulating the receptor-interacting protein 1 (RIP1)/receptor-interacting protein 3(RIP3)/mixed-lineage kinase domain-like protein(MLKL) signaling pathway.
Methods
2
A total of 60 Sprague-Dawley rats were randomly divided into sham-operation group(Sham group),MI model group(Model group),low-dose LIM group(LIM-L group,25 mg/kg LIM),high-dose LIM group(LIM-H group,50 mg/kg LIM),and high-dose LIM+RIP1 inhibitor Nec-1 group(LIM-H+Nec-1 group,50 mg/kg LIM+0.6 mg/kg Nec-1),with 12 rats in each group. A rat model of MI was established by ligation of the coronary artery. The changes of cardiac function were examined for each group; HE staining was used to observe the pathological changes of myocardial tissue;the 2,3,5-triphenyltetrazolium chloride-Evans blue method was used to measure myocardial infarct area; the terminal deoxynucleotidyl transferase-mediated dUTP nick end labeling method was used to observe the necrotic apoptosis of myocardial cells; quantitative real-time PCR and Western blot were used to measure the expression levels of mRNAs and proteins associated with the RIP1/RIP3/MLKL signaling pathway and the expression of apoptosis-related proteins.
Results
2
Compared with the Sham group,the Model group had significant reductions in left ventricular ejection fraction,left ventricular systolic pressure,and the expression level of B-cell lymphoma-2(Bcl-2) in myocardial tissue(all
P
<
0.001) and significant increases in left ventricular end-systolic volume,left ventricular end-diastolic pressure,left ventricular end-diastolic volume,myocardial infarct area,cell apoptosis rate,the mRNA and protein expression levels of RIP1,RIP3,and MLKL in myocardial tissue,and the protein expression levels of Bcl-2 associated X protein and cysteinyl aspartate-specific proteinase 3 in myocardial tissue(all
P
<
0.001),as well as swelling and disordered arrangement of myocardial cells with necrosis and massive inflammatory cell infiltration on HE pathological sections. Compared with the Model group,the LIM-H group showed reverse changes in the above indicators(RIP
1 mRNA:
P
=0.002,RIP3 mRNA:
P
=0.008,and the other indexes
P
were all
<
0.001),with alleviations of myocardial histopathological injury and inflammatory cell infiltration. Nec-1 promoted the effect of LIM in alleviating the necrotic apoptosis of myocardial cells in MI rats.
Conclusion
2
LIM may alleviate the necrotic apoptosis of myocardial cells in MI rats by downregulating the RIP1/RIP3/MLKL signaling pathway.
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