Effects of excessive endoplasmic reticulum stress on lung ischemia/reperfusion induced myocardial injury in mice.
10.12047/j.cjap.5581.2018.003
- Author:
Bing-Qian XIANG
1
;
Hui GAO
1
;
Mao-Lin HAO
1
;
Yong-Yue DAI
1
;
Wan-Tie WANG
1
Author Information
1. Ischemia/Reperfusion Injury Research Institute, Wenzhou Medical University, Wenzhou 325035, China.
- Publication Type:Journal Article
- Keywords:
endoplasmic reticulum;
lung;
mice;
myocardium;
reperfusion injury;
stress
- MeSH:
Animals;
Apoptosis;
Caspase 12;
Caspase 3;
metabolism;
Creatine Kinase, MB Form;
blood;
Endoplasmic Reticulum Stress;
Heart Injuries;
physiopathology;
Heat-Shock Proteins;
metabolism;
L-Lactate Dehydrogenase;
blood;
Lung;
pathology;
MAP Kinase Kinase 4;
metabolism;
Male;
Mice;
Mice, Inbred C57BL;
Myocardium;
pathology;
Random Allocation;
Reperfusion Injury;
Transcription Factor CHOP;
metabolism
- From:
Chinese Journal of Applied Physiology
2018;34(1):8-13
- CountryChina
- Language:Chinese
-
Abstract:
OBJECTIVE:To investigate the effects of excessive endoplasmic reticulum stress on lung ischemia/reperfusion (I/R) induced myocardial injury in mice.
METHODS:Forty healthy SPF male C57BL/6J mice were divided into 4 groups randomly (=10):sham operation group (Sham group), lung I/R group (I/R group), endoplasmic reticulum stress (ERS) pathway agonist Tunicamycin group (TM) and ERS inhibitor 4-phenyl butyric acid group (4-PBA). The model of lung I/R injury was established by clamping the left hilum of lung for 30 min followed by 180 min of reperfusion. In sham group, only sternotomy was performed, the hilum of lung was not clamped, and the mice were mechanically ventilated for 210 min. In TM and 4-PBA groups, TM 1mg/kg and 4-PBA 400 mg/kg were injected intraperitoneally, respectively, at 30 min before establishment of the model. At 180 min of reperfusion, blood samples were collected from the orbit for determination of myocardial enzyme. The animals were then sacrificed, and hearts were removed for determination of light microscope, TUNEL, Caspase 3 enzymatic activity, real-time polymerase chain reaction and Western blot.
RESULTS:Compared with sham group, the cardiomyocytes had obvious damage under light microscope, and the serum creatine kinase-MB (CK-MB) and lactic dehydrogenase (LDH) activities, apoptosis index and Caspase 3 enzymatic activity were increased significantly, the expressions of p-Jun N-terminalkinase(p-JNK), Caspase 12, CCAAT/enhancer-binding protein homologous protein (CHOP) and glucose regulated protein 78(GRP78) protein and mRNA were up-regulated in I/R, TM and 4-PBA groups (<0.01). Compared with I/R group, the cardiomyocytes damage was obvious under light microscope, and the serum CK-MB and LDH activities, apoptosis index and Caspase 3 enzymatic activity were increased significantly, the expressions of p-JNK, Caspase 12, CHOP and GRP78 protein and mRNA were up-regulated in group TM; while all above changes were relieved in group 4-PBA (<0.01). Compared with TM group, the cardiomyocytes damage was relieved under light microscope, and the serum CK-MB and LDH activities, apoptosis index and Caspase 3 enzymatic activity were decreased significantly, the expressions of p-JNK, Caspase 12,CHOP and GRP78 protein and mRNA were down-regulated in group 4-PBA.
CONCLUSIONS:The excessive endoplasmic reticulum stress participates in myocardial injury induced by lung ischemia/reperfusion (I/R) and inhibit excessive endoplasmic reticulum stress response can relieved myocardial injury.
