CREG protects from myocardial ischemia/reperfusion injury by regulating myocardial autophagy and apoptosis
Autor: | Yanxia Liu, Quanyu Zhang, Meili Liu, Xiaoxiang Tian, Erhe Gao, Nan Zhu, Haixu Song, Dan Liu, Yaling Han, Chenghui Yan, Yang Li, Chengfei Peng |
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Rok vydání: | 2017 |
Předmět: |
Male
0301 basic medicine Cell Muscle Proteins Apoptosis Myocardial Reperfusion Injury 030204 cardiovascular system & hematology Pharmacology Biology Mice 03 medical and health sciences 0302 clinical medicine Fibrosis Lysosome Autophagy medicine Animals Myocytes Cardiac Molecular Biology TUNEL assay Myocardium Chloroquine medicine.disease Mice Mutant Strains Repressor Proteins Disease Models Animal 030104 developmental biology medicine.anatomical_structure Immunology Molecular Medicine Lysosomes Reperfusion injury Homeostasis |
Zdroj: | Biochimica et Biophysica Acta (BBA) - Molecular Basis of Disease. 1863:1893-1903 |
ISSN: | 0925-4439 |
Popis: | Aims Human cellular repressor of E1A-stimulated genes (CREG) is a secreted glycoprotein that regulates tissue and cell homeostasis and has been shown to antagonize heart fibrosis, which indicates a potential protective effect of CREG against cardiomyocyte chronic damage. However, little is known about the role of CREG in myocardial tissue acute injury, in this study, we aimed to investigate the role of CREG in myocardial ischemia/reperfusion (MI/R) injury and clarify the mechanism of action. Methods and results Wild-type Creg (Creg +/+ ), heterozygous Creg (Creg +/− ) mice and mice pretreated with infusion of recombinant 0.3 mg/kg·d CREG protein (reCreg +/+ ) were subjected to 30 min of left ascending coronary ischemia and 24 h of reperfusion. Evan's Blue-triphenyl- tetrazolium chloride (TTC) solution and echocardiography analysis were used to evaluate the effects of CREG on MI/R mice. The underlying mechanisms were further determined by cultured myocardial cells in vitro. Our findings revealed that the level of CREG protein in mouse hearts was significantly decreased after mice were subjected to MI/R. Moreover, Creg +/− mice had larger infarction size 2 h after reperfusion and worse cardiac function 28 days after MI/R injury compared to that in Creg +/+ mice. However, reCreg +/+ mice could maintain CREG at a high level even after MI/R injury, and mitigated infarction size and improved cardiac function significantly. In Creg +/− mice, myocardial autophagy was dysfunctional characterized by accumulation of LC3A and p62, while apoptotic cell number increase was detected by cleaved caspase-3 blotting and TUNEL staining. Conversely, decreased apoptosis and activated autophagy were detected in reCreg +/+ mice. Furthermore, chloroquine, a kind of autophagy blocker, was used to demonstrate recombinant CREG protected cardiomyocytes against apoptosis mediated by activating autophagy both in vivo and in vitro . Finally, we found CREG was involved into lysosomal protein transfer and improve cellular autophagy. Conclusion CREG protects heart against MI/R injury-induced cardiomyocytes apoptosis by activating lysosomal autophagy. This article is part of a Special Issue entitled: Genetic and epigenetic control of heart failure - edited by Jun Ren and Megan Yingmei Zhang. |
Databáze: | OpenAIRE |
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