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myocardial and autophagy

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https://www.readbyqxmd.com/read/28079007/novel-therapies-targeting-cardioprotection-and-regeneration
#1
Valeria Garrido, Evelyn Mendoza-Torres, Jaime A Riquelme, Ariel Díaz, Marcela Pizarro, Mario Bustamante, Myra N Chavez, María Paz Ocaranza, Rosemarie Mellado, Ramon Corbalan, Miguel L Allende, Sergio Lavandero
Cardiovascular disease is the leading cause of death worldwide. The heart is susceptible to pathologies that impact the myocardium directly, such myocardial infarction and consequent heart failure, as well as conditions with indirect cardiac effects, such cancer treatment-related cardiotoxicity. As the contractile cells of the heart, cardiomyocytes are essential for normal cardiac function. Various stress stimuli may result in transient damage or cell death in cardiomyocytes through apoptosis, necrosis or maladaptive autophagy...
January 12, 2017: Current Pharmaceutical Design
https://www.readbyqxmd.com/read/28036273/nerve-growth-factor-induced-akt-mtor-activation-protects-the-ischemic-heart-via-restoring-autophagic-flux-and-attenuating-ubiquitinated-protein-accumulation
#2
Zhou-Guang Wang, Hao Li, Yan Huang, Rui Li, Xiao-Fan Wang, Li-Xia Yu, Xue-Qiang Guang, Lei Li, Hong-Yu Zhang, Ying-Zheng Zhao, Chunxiang Zhang, Xiao-Kun Li, Rong-Zhou Wu, Mao-Ping Chu, Jian Xiao
The dysregulation of autophagy is related to a variety of cardiovascular diseases, such as myocardial ischemia/reperfusion (I/R). Nerve growth factor (NGF) has been shown to have therapeutic potential in ischaemic heart injury. In this study, we demonstrate that NGF administration can accelerate autophagic flux and attenuate protein ubiquitination in myocardial I/R heart. Our results showed that NGF could restored heart function and decreased the apoptosis of cardiomyocytes which induced by myocardial I/R injury...
December 27, 2016: Oncotarget
https://www.readbyqxmd.com/read/28013216/diesel-exhaust-particles-contribute-to-endothelia-apoptosis-via-autophagy-pathway
#3
Jhih-Syuan Wang, Chia-Yi Tseng, Ming-Wei Chao
Epidemiological studies suggest that an increase of PM2.5 diesel exhaust particles (DEP) in ambient air corresponds to increased myocardial infarctions and atherosclerosis. When exposed to DEP, endothelial cells exhibit increases in oxidative stress and apoptosis, but the role of autophagy in this DEP-induced cell death remains unclear. Here, we suggest that acute DEP exposure produces intracellular ROS leading to induction of DEP internalization, endothelial dysfunction, and pro-inflammation in an in vitro HUVEC model...
December 24, 2016: Toxicological Sciences: An Official Journal of the Society of Toxicology
https://www.readbyqxmd.com/read/27998869/-role-of-autophagy-in-fasudil-induced-rho-kinase-inhibition-for-protection-against-myocardial-ischemia-reperfusion-injury-in-rats
#4
Hong-Wei Ye, Ting-Ting Fang, Xiao-Yu Gu, Ya Wang, Guang-Yu Zhu, Ying Yu, Qin Gao
OBJECTIVE: To investigate the changes of autophagy in ischemic myocardium of rats treated with fasudil for inhibiting Rho kinase. METHODS: The hearts isolated from male Sprague-Dawley rats were subjected to 30 min of occlusion of the left anterior descending artery followed by 120 min of reperfusion with or without treatment with fasudil or fasudil+Wort. The left ventricular hemodynamics were continuously recorded, and the coronary effluent was collected during the reperfusion to determine lactate dehydrogenase (LDH) levels...
December 20, 2016: Nan Fang Yi Ke da Xue Xue Bao, Journal of Southern Medical University
https://www.readbyqxmd.com/read/27994061/focal-adhesion-kinase-mediated-phosphorylation-of-beclin1-suppresses-cardiomyocyte-autophagy-and-initiates-hypertrophic-growth
#5
Zhaokang Cheng, Qiang Zhu, Rachel Dee, Zachary Opheim, Christopher P Mack, Douglas M Cyr, Joan M Taylor
Autophagy is an evolutionarily conserved intracellular degradation/recycling system that is essential for cellular homeostasis but is dysregulated in a number of diseases including myocardial hypertrophy. While it is clear that limiting or accelerating autophagic flux can result in pathological cardiac remodeling, the physiological signaling pathways that fine-tune cardiac autophagy are poorly understood. Herein, we demonstrated that stimulation of cardiomyocytes with phenylephrine (PE), a well-known hypertrophic agonist, suppresses autophagy and that activation of focal adhesion kinase (FAK) is necessary for PE-stimulated autophagy suppression and subsequent initiation of hypertrophic growth...
December 19, 2016: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/27981363/mir-539-as-a%C3%A2-key-negative-regulator-of-the-mek-pathway-in-myocardial-infarction
#6
J Hui, W Huishan, L Tao, Y Zhonglu, Z Renteng, H Hongguang
BACKGROUND: Myocardial infarction is one of the most common causes of death, and the number of individuals at risk is increasing. A rapid and accurate differential diagnosis of myocardial infarction is crucial for timely interventions and for improvement of the prognosis. However, it is difficult to achieve using current methods. To better manage this condition, improved tools for risk prediction, including more accurate biomarkers, are needed. METHODS: We studied the expression of microRNA-539 (miR-539) and of MEK protein using a rat model of myocardial infarction...
December 15, 2016: Herz
https://www.readbyqxmd.com/read/27981013/plga-pnipam-microspheres-loaded-with-the-gastrointestinal-nutrient-nab-ameliorate-cardiac-dysfunction-by-activating-sirt3-in-acute-myocardial-infarction
#7
Panke Cheng, Wen Zeng, Li Li, Da Huo, Lingqing Zeng, Ju Tan, Jingting Zhou, Jiansen Sun, Ge Liu, Yanzhao Li, Ge Guan, Yuxin Wang, Chuhong Zhu
Acute myocardial infarction (AMI) is the death of cardiomyocytes caused by a lack of energy due to ischemia. Nutrients supplied by the blood are the main source of cellular energy for cardiomyocytes. Sodium butyrate (NaB), a gastrointestinal nutrient, is a short-chain fatty acid (butyric acid) that may act as an energy source in AMI therapy. Poly(lactic-co-glycolic acid)-Poly (N-isopropylacrylamide) microspheres loaded with NaB (PP-N) are synthesized to prolong the release of NaB and are injected into ischemic zones in a Sprague-Dawley rat AMI model...
December 2016: Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
https://www.readbyqxmd.com/read/27973540/bicarbonate-increases-ischemia-reperfusion-damage-by-inhibiting-mitophagy
#8
Bruno B Queliconi, Alicia J Kowaltowski, Roberta A Gottlieb
During an ischemic event, bicarbonate and CO2 concentration increase as a consequence of O2 consumption and lack of blood flow. This event is important as bicarbonate/CO2 is determinant for several redox and enzymatic reactions, in addition to pH regulation. Until now, most work done on the role of bicarbonate in ischemia-reperfusion injury focused on pH changes; although reperfusion solutions have a fixed pH, cardiac resuscitation protocols commonly employ bicarbonate to correct the profound acidosis associated with respiratory arrest...
2016: PloS One
https://www.readbyqxmd.com/read/27967213/could-nlrp3-inflammasome-be-a-cardiovascular-risk-biomarkers-in-acute-myocardial-infarction-patients
#9
Pedro Bullon, Francisco J Cano-García, Elisabet Alcocer-Gómez, Alfonso Varela-Lopez, Lourdes Román-Malo, Rafael J Ruiz-Salmerón, Jose L Quiles, Jose M Navarro-Pando, Maurizio Battino, Jesús Ruiz-Cabello, Luis J Jiménez-Borreguero, Mario D Cordero
Conventional cardiovascular risk factors (CVRF) are accepted to identify asymptomatic individuals with high risk of acute myocardial infarction (AMI). However, AMI affects many patients previously classified at low risk. New biomarkers are needed to improve risk prediction. We propose to evaluate the NLRP3-inflammasome complex as a potential CVR indicator in healthy males and post-AMI patients and compare both groups by known CVRFs. We included 109 men with no history of cardiovascular disease (controls) and 150 AMI patients attending a cardiac rehabilitation program...
December 14, 2016: Antioxidants & Redox Signaling
https://www.readbyqxmd.com/read/27928720/cardioprotection-of-exercise-preconditioning-involving-heat-shock-protein-70-and-concurrent-autophagy-a-potential-chaperone-assisted-selective-macroautophagy-effect
#10
Yang Yuan, Shan-Shan Pan, Yu-Jun Shen
It has been confirmed that exercise preconditioning (EP) has a protective effect on acute cardiovascular stress. However, how Hsp70 participates in EP-induced cardioprotection is unknown. EP may involve Hsp70 to repair unfolded proteins or may also stabilize the function of the endoplasmic reticulum via Hsp70-related autophagy to work on a protective formation. Our EP protocol involves four periods of 10 min running with 10 min recovery intervals. We added a period of exhaustive running to test this protective effect, using histology and molecular biotechnology methods to detect related markers...
December 7, 2016: Journal of Physiological Sciences: JPS
https://www.readbyqxmd.com/read/27904666/ad-hgf-improves-the-cardiac-remodeling-of-rat-following-myocardial-infarction-by-upregulating-autophagy-and-necroptosis-and-inhibiting-apoptosis
#11
Jiabao Liu, Peng Wu, Yunle Wang, Yingqiang Du, Nan A, Shuiyuan Liu, Yiming Zhang, Ningtian Zhou, Zhihui Xu, Zhijian Yang
Cell death in MI is the most critical determinant of subsequent left ventricular remodeling and heart failure. Besides apoptosis, autophagy and necroptosis have been recently found to be another two regulated cell death styles. HGF has been reported to have a protective role in MI, but its impact on the three death styles remains unclear. Thus, our study was performed to investigate the distribution of autophagy, apoptosis and necroptosis in cardiac tissues after MI and explore the role and mechanism of Ad-HGF on cardiac remodeling by regulating the three death styles...
2016: American Journal of Translational Research
https://www.readbyqxmd.com/read/27899860/leptin-attenuates-the-contractile-function-of-adult-rat-cardiomyocytes-involved-in-oxidative-stress-and-autophagy
#12
Liu-Jin Luo, Ying-Ping Liu, Xun Yuan, Gui-Ping Zhang, Ning Hou, Xiao-Qian Wu, Jian-Dong Luo, Gen-Shui Zhang
BACKGROUND: Leptin has been identified as an important protein involved in obesity. As a chronic metabolic disorder, obesity is associated with a high risk of developing cardiovascular and metabolic diseases, including heart failure. The aim of this paper was to investigate the effects and the mechanism of leptin on the contractile function of cardiomyocytes in the adult rat. METHODS: Isolated adult rat cardiomyocytes were exposed to leptin (1, 10, and 100 nmol/L) for 1 hour...
November 2016: Acta Cardiologica Sinica
https://www.readbyqxmd.com/read/27882354/bcl-2-associated-athanogene-3-protects-the-heart-from-ischemia-reperfusion-injury
#13
Feifei Su, Valerie D Myers, Tijana Knezevic, JuFang Wang, Erhe Gao, Muniswamy Madesh, Farzaneh G Tahrir, Manish K Gupta, Jennifer Gordon, Joseph Rabinowitz, Frederick V Ramsey, Douglas G Tilley, Kamel Khalili, Joseph Y Cheung, Arthur M Feldman
Bcl-2-associated athanogene 3 (BAG3) is an evolutionarily conserved protein expressed at high levels in the heart and the vasculature and in many cancers. While altered BAG3 expression has been associated with cardiac dysfunction, its role in ischemia/reperfusion (I/R) is unknown. To test the hypothesis that BAG3 protects the heart from reperfusion injury, in vivo cardiac function was measured in hearts infected with either recombinant adeno-associated virus serotype 9-expressing (rAAV9-expressing) BAG3 or GFP and subjected to I/R...
November 17, 2016: JCI Insight
https://www.readbyqxmd.com/read/27880725/mouse-sirt3-promotes-autophagy-in-angii-induced-myocardial-hypertrophy-through-the-deacetylation-of-foxo1
#14
Jingyuan Li, Tongshuai Chen, Ming Xiao, Na Li, Shujian Wang, Hongyan Su, Xiaobin Guo, Hui Liu, Fangying Yan, Yi Yang, Yun Zhang, Peili Bu
Sirt3, a mitochondrial NAD+-dependent histone deacetylase, is the only member proven to promote longevity in mammalian Sirtuin family. The processed short form of Sirt3 has been demonstrated to target many mediators of energy metabolism and mitochondrial stress adaptive program. Autophagy serves as a dynamic recycling mechanism and provides energy or metabolic substrates. Among the mechanisms triggered by cardiac stress, opinions vary as to whether autophagy is a protective or detrimental response. Here, by inducing the Sirt3-knockout mice to myocardial hypertrophy with chronic angiotensin II infusion for four weeks, we determined the role of Sirt3 in myocardial hypertrophy and autophagy...
November 17, 2016: Oncotarget
https://www.readbyqxmd.com/read/27865880/nod2-mediates-isoflurane-preconditioning-induced-protection-of-myocardial-injury
#15
Cheng Yang, Yang Jiao, Nuo Yan, Banglin Wu, Yiqing Ren, Hui Li, Jinchao Sun, Jie Gao
Anesthetic cardioprotection reduces myocardial infarct size following ischemia-reperfusion injury. However, the underlying mechanisms that drive ischemia-reperfusion injury in cardiomyocytes remain unclear. In this study, we report that isoflurane, a commonly used inhaled anesthetic, can protect cardiomyocytes from anoxia/reoxygenation injury by a nucleotide binding oligomerization domain containing 2 (NOD2)-dependent mechanism. The results showed that isoflurane increased cell viability, and decreased autophagosome generation in primary cardiomyocytes under anoxia/reoxygenation conditions...
January 10, 2017: Neuroscience Letters
https://www.readbyqxmd.com/read/27865838/helix-b-surface-peptide-attenuates-diabetic-cardiomyopathy-via-ampk-dependent-autophagy
#16
Chen Lin, Mingming Zhang, Yingmei Zhang, Kejian Yang, Jianqiang Hu, Rui Si, Guoyong Zhang, Beilei Gao, Xiang Li, Chennian Xu, Congye Li, Qimeng Hao, Wenyi Guo
BACKGROUND: Erythropoietin (EPO) has been reported to exert protective effects on a host of damaged tissues. However, the erythropoietic effect of this hormone can result in high risks of thrombosis, stroke, and hypertension, remarkably limiting the clinical use of EPO. Helix B surface peptide (HBSP) is a small peptide derived from the helix-B domain of EPO. Surprisingly, HBSP retains the tissue protective properties of EPO without altering the hematocrit. Thus, we evaluated the possible role of HBSP on diabetic cardiomyopathy...
January 22, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/27862268/novel-protective-role-of-nuclear-melatonin-receptor-ror%C3%AE-in-diabetic-cardiomyopathy
#17
Yichao Zhao, Longwei Xu, Song Ding, Nan Lin, Qingqi Ji, Lingchen Gao, Yuanyuan Su, Jun Pu, Ben He
Diabetic cardiomyopathy is a major complication that significantly contributes to morbidity and mortality in diabetics with few therapies. Moreover, anti-diabetic drugs reported inconsistent or even adverse cardiovascular effects, suggesting it is important to exploit novel therapeutic targets against diabetic cardiomyopathy. Here, we observed that the nuclear melatonin receptor, the retinoic acid-related orphan receptor α (RORα), was downregulated in diabetic hearts. By utilizing a mouse line with RORα disruption, we demonstrated that RORα deficiency led to significantly augmented diastolic dysfunction and cardiac remodeling induced by diabetes...
November 18, 2016: Journal of Pineal Research
https://www.readbyqxmd.com/read/27857190/simulated-ischemia-reperfusion-induced-p65-beclin-1-dependent-autophagic-cell-death-in-human-umbilical-vein-endothelial-cells
#18
Min Zeng, Xin Wei, Zhiyong Wu, Wei Li, Yin Zheng, Bing Li, Xuqing Meng, Xiuhong Fu, Yi Fei
Myocardial ischemia/reperfusion (I/R) injury detrimentally alters the prognosis of patients undergoing revascularization after acute myocardial infarction. Our previous study demonstrated that NF-κB-induced autophagy plays a detrimental role in cardiac I/R injury using a rabbit myocardial I/R model. In this study, we sought to explore the specific mechanism of this autophagy-mediated cell damage in an in vitro simulated ischemia/reperfusion (sI/R) model using human umbilical vein endothelial cells. Our current study demonstrates that simulated I/R induces autophagy in a p65-Beclin 1-dependent manner, which can be suppressed with the inhibition of NF-κB...
November 18, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27832938/keto-acid-metabolites-of-branched-chain-amino-acids-inhibit-oxidative-stress-induced-necrosis-and-attenuate-myocardial-ischemia-reperfusion-injury
#19
Weibing Dong, Meiyi Zhou, Mei Dong, Bangfen Pan, Yunxia Liu, Jing Shao, Xiaoping Gu, Ying Huang, Guangping Li, Yibin Wang, Haipeng Sun
Branched chain α-keto acids (BCKAs) are endogenous metabolites of branched-chain amino acids (BCAAs). BCAA and BCKA are significantly elevated in pathologically stressed heart and contribute to chronic pathological remodeling and dysfunction. However, their direct impact on acute cardiac injury is unknown. Here, we demonstrated that elevated BCKAs significantly attenuated ischemia-reperfusion (I/R) injury and preserved post I/R function in isolated mouse hearts. BCKAs protected cardiomyocytes from oxidative stress-induced cell death in vitro...
December 2016: Journal of Molecular and Cellular Cardiology
https://www.readbyqxmd.com/read/27830000/ampk-mediated-cardioprotection-of-atorvastatin-relates-to-the-reduction-of-apoptosis-and-activation-of-autophagy-in-infarcted-rat-hearts
#20
Qing Li, Qiu-Ting Dong, Yue-Jin Yang, Xia-Qiu Tian, Chen Jin, Pei-Sen Huang, Lei-Pei Jiang, Gui-Hao Chen
Atorvastatin (ATV) has an important pro-survival role in cardiomyocytes after acute myocardial infarction (AMI). The objectives of this study were to: 1) determine whether ATV could affect autophagy of cardiomyocytes via the AMP-activated protein kinase (AMPK)/mammalian target of rapamycin (mTOR) pathway, and 2) investigate the balance between autophagy and apoptosis pathways. Male Wistar rats (n = 100) were randomly divided into sham, control, ATV, Compound C, and ATV+ Compound C groups. In this AMI model, drug treatments were administered for 1 week before induction of MI by surgical ligation, and measurements were taken 1 and 4 weeks after AMI induction...
2016: American Journal of Translational Research
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