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heart failure and endoplasmic reticulum

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https://www.readbyqxmd.com/read/28208629/effects-of-the-activin-a-follistatin-system-on-myocardial-cell-apoptosis-through-the-endoplasmic-reticulum-stress-pathway-in-heart-failure
#1
Miao Liu, Cuiying Mao, Jiayu Li, Fanglei Han, Ping Yang
BACKGROUND: A previous study suggested that activin A inhibited myocardial cell apoptosis. This study thus aimed to explore the effects of the activin A-follistatin system on myocardial cell apoptosis in heart failure (HF) rats in order to determine whether or not the mechanism operates through the endoplasmic reticulum stress (ERS) pathway. METHODS: Myocardial infarction (MI) by vascular deprivation was used to induce HF. The enzyme-linked immunosorbent assay was used to detect activin A, follistatin and brain natriuretic peptide (BNP) contents in serum...
February 10, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28176614/acanthomatous-ameloblastoma-with-atypical-foci-in-five-dogs
#2
Jennifer L Malmberg, Elizabeth W Howerth, Barb E Powers, Paula A Schaffer
Acanthomatous ameloblastoma is a common, locally invasive, nonmetastasizing tumor of the canine oral cavity. The long-term prognosis for canine acanthomatous ameloblastoma is good if complete excision can be achieved, usually by maxillectomy or mandibulectomy. A variant of acanthomatous ameloblastoma with atypical foci was noted in 5 dogs. There was no age, breed, or sex predisposition. Atypical cells were pleomorphic with a high mitotic rate. They were immunohistochemically negative for cytokeratin, vimentin, melan A, PNL2, CD3, Pax5, CD18, chromogranin A, and synaptophysin...
January 1, 2017: Journal of Veterinary Diagnostic Investigation
https://www.readbyqxmd.com/read/28151473/knockout-of-eva1a-leads-to-rapid-development-of-heart-failure-by-impairing-autophagy
#3
Shu Zhang, Xin Lin, Ge Li, Xue Shen, Di Niu, Guang Lu, Xin Fu, Yingyu Chen, Ming Cui, Yun Bai
EVA1A (Eva-1 homologue A) is a novel lysosome and endoplasmic reticulum-associated protein that can regulate cell autophagy and apoptosis. Eva1a is expressed in the myocardium, but its function in myocytes has not yet been investigated. Therefore, we generated inducible, cardiomyocyte-specific Eva1a knockout mice with an aim to determine the role of Eva1a in cardiac remodelling in the adult heart. Data from experiments showed that loss of Eva1a in the adult heart increased cardiac fibrosis, promoted cardiac hypertrophy, and led to cardiomyopathy and death...
February 2, 2017: Cell Death & Disease
https://www.readbyqxmd.com/read/28134413/the-function-and-significance-of-sera2a-in-congestive-heart-failure-an-analysis-of-gene-therapy-trials
#4
REVIEW
Pei Wu, Yuting Zhai, Dongye Li
Congestive heart failure (CHF) is a widespread disease that has a negative impact on health, worldwide. Despite advances in therapies, morbidity, mortality and hospital discharges due to CHF remain high. Advances in the understanding of the pathophysiological mechanisms of CHF and the development of gene transfer technology have made gene therapy a realistic potential therapeutic method for CHF. Among the various potential targets, sarco-endoplasmic reticulum Ca2+-ATPase 2a (SERCA2a), which is an important protein in the regulation of Ca2+ cycling, has piqued the interest of many researchers...
January 30, 2017: Histology and Histopathology
https://www.readbyqxmd.com/read/28120277/protein-quality-control-dysfunction-in-cardiovascular-complications-induced-by-anti-cancer-drugs
#5
Hai Ying Fu, Mikio Mukai, Nobuhisa Awata, Yasushi Sakata, Masatsugu Hori, Tetsuo Minamino
Cardiovascular complications, including heart failure, hypertension, ischemic syndromes and venous thromboembolism, have been identified in patients treated with anti-cancer drugs. Oxidative stress, mitochondrial dysfunction and DNA synthesis inhibition are considered to be responsible for the cardiotoxicity induced by these agents. Protein quality control (PQC) has 3 major components, including the endoplasmic reticulum (ER), the ubiquitin-proteasome system (UPS) and the autophagy-lysosome system, and participates in protein folding and degradation to maintain protein homeostasis...
January 24, 2017: Cardiovascular Drugs and Therapy
https://www.readbyqxmd.com/read/27911441/sirt1-protects-the-heart-from-er-stress-induced-cell-death-through-eif2%C3%AE-deacetylation
#6
Alexandre Prola, Julie Pires Da Silva, Arnaud Guilbert, Lola Lecru, Jérôme Piquereau, Maxance Ribeiro, Philippe Mateo, Mélanie Gressette, Dominique Fortin, Céline Boursier, Cindy Gallerne, Anaïs Caillard, Jane-Lise Samuel, Hélène François, David A Sinclair, Pierre Eid, Renée Ventura-Clapier, Anne Garnier, Christophe Lemaire
Over the past decade, endoplasmic reticulum (ER) stress has emerged as an important mechanism involved in the pathogenesis of cardiovascular diseases including heart failure. Cardiac therapy based on ER stress modulation is viewed as a promising avenue toward effective therapies for the diseased heart. Here, we tested whether sirtuin-1 (SIRT1), a NAD(+)-dependent deacetylase, participates in modulating ER stress response in the heart. Using cardiomyocytes and adult-inducible SIRT1 knockout mice, we demonstrate that SIRT1 inhibition or deficiency increases ER stress-induced cardiac injury, whereas activation of SIRT1 by the SIRT1-activating compound STAC-3 is protective...
February 2017: Cell Death and Differentiation
https://www.readbyqxmd.com/read/27815070/direct-detection-of-serca-calcium-transport-and-small-molecule-inhibition-in-giant-unilamellar-vesicles
#7
Tengfei Bian, Joseph M Autry, Denise Casemore, Ji Li, David D Thomas, Gaohong He, Chengguo Xing
We have developed a charge-mediated fusion method to reconstitute the sarco/endoplasmic reticulum Ca(2+)-ATPase (SERCA) in giant unilamellar vesicles (GUV). Intracellular Ca(2+) transport by SERCA controls key processes in human cells such as proliferation, signaling, and contraction. Small-molecule effectors of SERCA are urgently needed as therapeutics for Ca(2+) dysregulation in human diseases including cancer, diabetes, and heart failure. Here we report the development of a method for efficiently reconstituting SERCA in GUV, and we describe a streamlined protocol based on optimized parameters (e...
December 9, 2016: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/27763637/nogo-c-regulates-cardiomyocyte-apoptosis-during-mouse-myocardial-infarction
#8
Shi Jia, Xue Qiao, Jingjing Ye, Xuan Fang, Chunling Xu, Yangpo Cao, Ming Zheng
Myocardial infarction is caused by insufficient coronary blood supply, which leads to myocardial damage and eventually the heart failure. Molecular mechanisms associated with the loss of cardiomyocytes during myocardial infarction (MI) and ischemia-related cardiac diseases are not yet fully understood. Nogo-C is an endoplasmic reticulum protein ubiquitously expressed in tissues including in the heart, however, the cardiac function of Nogo-C is still unknown. In the present study, we found that Nogo-C was upregulated in mouse hearts after MI, and hypoxic treatments also increased Nogo-C protein level in cardiomyocytes...
October 20, 2016: Cell Death & Disease
https://www.readbyqxmd.com/read/27667442/histone-deacetylase-inhibitor-phenylbutyrate-exaggerates-heart-failure-in-pressure-overloaded-mice-independently-of-hdac-inhibition
#9
Jing Ma, Tao Luo, Zhi Zeng, Haiying Fu, Yoshihiro Asano, Yulin Liao, Tetsuo Minamino, Masafumi Kitakaze
4-Sodium phenylbutyrate (PBA) has been reported to inhibit endoplasmic reticulum stress and histone deacetylation (HDAC), both of which are novel therapeutic targets for cardiac hypertrophy and heart failure. However, it is unclear whether PBA can improve heart function. Here, we tested the effects of PBA and some other HDAC inhibitors on cardiac dysfunction induced by pressure overload. Transverse aortic constriction (TAC) was performed on male C57BL/6 mice. PBA treatment (100 mg/kg, 6 weeks) unexpectedly led to a higher mortality, exacerbated cardiac remodelling and dysfunction...
September 26, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27536244/reactive-oxygen-species-endoplasmic-reticulum-stress-and-mitochondrial-dysfunction-the-link-with-cardiac-arrhythmogenesis
#10
REVIEW
Gary Tse, Bryan P Yan, Yin W F Chan, Xiao Yu Tian, Yu Huang
BACKGROUND: Cardiac arrhythmias represent a significant problem globally, leading to cerebrovascular accidents, myocardial infarction, and sudden cardiac death. There is increasing evidence to suggest that increased oxidative stress from reactive oxygen species (ROS), which is elevated in conditions such as diabetes and hypertension, can lead to arrhythmogenesis. METHOD: A literature review was undertaken to screen for articles that investigated the effects of ROS on cardiac ion channel function, remodeling and arrhythmogenesis...
2016: Frontiers in Physiology
https://www.readbyqxmd.com/read/27496879/endoplasmic-reticulum-stress-increases-brain-mapk-signaling-inflammation-and-renin-angiotensin-system-activity-and-sympathetic-nerve-activity-in-heart-failure
#11
Shun-Guang Wei, Yang Yu, Robert M Weiss, Robert B Felder
We previously reported that endoplasmic reticulum (ER) stress is induced in the subfornical organ (SFO) and the hypothalamic paraventricular nucleus (PVN) of heart failure (HF) rats and is reduced by inhibition of mitogen-activated protein kinase (MAPK) signaling. The present study further examined the relationship between brain MAPK signaling, ER stress, and sympathetic excitation in HF. Sham-operated (Sham) and HF rats received a 4-wk intracerebroventricular (ICV) infusion of vehicle (Veh) or the ER stress inhibitor tauroursodeoxycholic acid (TUDCA, 10 μg/day)...
October 1, 2016: American Journal of Physiology. Heart and Circulatory Physiology
https://www.readbyqxmd.com/read/27470514/essential-role-of-smooth-muscle-stim1-in-hypertension-and-cardiovascular-dysfunction
#12
Modar Kassan, Karima Ait-Aissa, Eman Radwan, Vishal Mali, Samuel Haddox, Mohanad Gabani, Wei Zhang, Souad Belmadani, Kaikobad Irani, Mohamed Trebak, Khalid Matrougui
OBJECTIVES: Chronic hypertension is the most critical risk factor for cardiovascular disease, heart failure, and stroke. APPROACH AND RESULTS: Here we show that wild-type mice infused with angiotensin II develop hypertension, cardiac hypertrophy, perivascular fibrosis, and endothelial dysfunction with enhanced stromal interaction molecule 1 (STIM1) expression in heart and vessels. All these pathologies were significantly blunted in mice lacking STIM1 specifically in smooth muscle (Stim1(SMC-/-))...
September 2016: Arteriosclerosis, Thrombosis, and Vascular Biology
https://www.readbyqxmd.com/read/27442881/toll-like-receptor-4-ablation-rescues-against-paraquat-triggered-myocardial-dysfunction-role-of-er-stress-and-apoptosis
#13
Yonghong Lei, Xue Li, Fang Yuan, Lu Liu, Juan Zhang, Yanping Yang, Jieqiong Zhao, Yan Han, Jun Ren, Xiaobing Fu
Paraquat is a nitrogen herbicide imposing severe organ toxicity in human leading to acute lung injury and heart failure. The present study was designed to examine the impact of ablation of the innate proinflammatory mediator toll-like receptor 4 (TLR4) in paraquat-induced cardiac contractile dysfunction and the underlying mechanisms involved with a focus on endoplasmic reticulum (ER) stress and apoptosis. Adult male wild-type (WT) and TLR4 knockout (TLR4(-/-) ) mice were challenged with paraquat (45 mg/kg, i...
February 2017: Environmental Toxicology
https://www.readbyqxmd.com/read/27441395/inhibition-of-the-unfolded-protein-response-mechanism-prevents-cardiac-fibrosis
#14
Jody Groenendyk, Dukgyu Lee, Joanna Jung, Jason R B Dyck, Gary D Lopaschuk, Luis B Agellon, Marek Michalak
BACKGROUND: Cardiac fibrosis attributed to excessive deposition of extracellular matrix proteins is a major cause of heart failure and death. Cardiac fibrosis is extremely difficult and challenging to treat in a clinical setting due to lack of understanding of molecular mechanisms leading to cardiac fibrosis and effective anti-fibrotic therapies. The objective in this study was to examine whether unfolded protein response (UPR) pathway mediates cardiac fibrosis and whether a pharmacological intervention to modulate UPR can prevent cardiac fibrosis and preserve heart function...
2016: PloS One
https://www.readbyqxmd.com/read/27402067/effect-of-heart-failure-on-catecholamine-granule-morphology-and-storage-in-chromaffin-cells
#15
Sushil K Mahata, Hong Zheng, Sumana Mahata, Xuefei Liu, Kaushik P Patel
One of the key mechanisms involved in sympathoexcitation in chronic heart failure (HF) is the activation of the adrenal glands. Impact of the elevated catecholamines on the hemodynamic parameters has been previously demonstrated. However, studies linking the structural effects of such overactivation with secretory performance and cell metabolism in the adrenomedullary chromaffin cells in vivo have not been previously reported. In this study, HF was induced in male Sprague-Dawley rats by ligation of the left coronary artery...
September 2016: Journal of Endocrinology
https://www.readbyqxmd.com/read/27393458/blockade-of-receptor-for-advanced-glycation-end-products-protects-against-systolic-overload-induced-heart-failure-after-transverse-aortic-constriction-in-mice
#16
Yu Liu, Manli Yu, Zhigang Zhang, Yunhua Yu, Qi Chen, Wei Zhang, Xianxian Zhao
Heart failure is the consequence of sustained, abnormal neurohormonal and mechanical stress and remains a leading cause of death worldwide. The aim of this work was to identify whether blockade of receptor for advanced glycation end products (RAGE) protected against systolic overload-induced heart failure and investigate the possible underlying mechanism. It was found that RAGE mRNA and protein expression was up-regulated in cardiac tissues from mice subjected to pressure overload by transverse aortic constriction (TAC)...
November 15, 2016: European Journal of Pharmacology
https://www.readbyqxmd.com/read/27346262/-salubrinal-improves-cardiac-function-in-rats-with-heart-failure-post-myocardial-infarction-through-reducing-endoplasmic-reticulum-stress-associated-apoptosis
#17
Y Liu, S Y Qi, L S Ru, C Ding, H J Wang, A Y Li, B Y Xu, G H Zhang, D M Wang
OBJECTIVE: Endoplasmic reticulum (ER) stress plays an important role in ischemia-mediated cell death. The aim of the current study is to investigate the effects of salubrinal (Sal), a selective eIF2a dephosphorylation inhibitor, on heart failure rats and related mechanisms. METHODS: Heart failure was induced by coronary artery ligation (MI) in adult male Sprague-Dawley rats. To ensure comparable MI sizes post coronary artery ligation on various groups, echocardiography examination was performed before and 30 minutes after ligation in MI groups...
June 24, 2016: Zhonghua Xin Xue Guan Bing za Zhi
https://www.readbyqxmd.com/read/27305869/aerobic-exercise-training-rescues-cardiac-protein-quality-control-and-blunts-endoplasmic-reticulum-stress-in-heart-failure-rats
#18
Luiz H M Bozi, Paulo R Jannig, Natale Rolim, Vanessa A Voltarelli, Paulo M M Dourado, Ulrik Wisløff, Patricia C Brum
Cardiac endoplasmic reticulum (ER) stress through accumulation of misfolded proteins plays a pivotal role in cardiovascular diseases. In an attempt to reestablish ER homoeostasis, the unfolded protein response (UPR) is activated. However, if ER stress persists, sustained UPR activation leads to apoptosis. There is no available therapy for ER stress relief. Considering that aerobic exercise training (AET) attenuates oxidative stress, mitochondrial dysfunction and calcium imbalance, it may be a potential strategy to reestablish cardiac ER homoeostasis...
June 16, 2016: Journal of Cellular and Molecular Medicine
https://www.readbyqxmd.com/read/27133203/deregulation-of-xbp1-expression-contributes-to-myocardial-vascular-endothelial-growth-factor-a-expression-and-angiogenesis-during-cardiac-hypertrophy-in%C3%A2-vivo
#19
Quanlu Duan, Li Ni, Peihua Wang, Chen Chen, Lei Yang, Ben Ma, Wei Gong, Zhejun Cai, Ming-Hui Zou, Dao Wen Wang
Endoplasmic reticulum (ER) stress has been reported to be involved in many cardiovascular diseases such as atherosclerosis, diabetes, myocardial ischemia, and hypertension that ultimately result in heart failure. XBP1 is a key ER stress signal transducer and an important pro-survival factor of the unfolded protein response (UPR) in mammalian cells. The aim of this study was to establish a role for XBP1 in the deregulation of pro-angiogenic factor VEGF expression and potential regulatory mechanisms in hypertrophic and failing heart...
August 2016: Aging Cell
https://www.readbyqxmd.com/read/27122935/total-flavonoids-of-astragalus-plays-a-cardioprotective-role-in-viral-myocarditis
#20
Xiaomin Zhou, Qing Xin, Yilin Wang, Yajun Zhao, Hua Chai, Xia Huang, Xiexin Tao, Ming Zhao
BACKGROUND: Viral myocarditis is initiated by viral infection of myocardial tissue leading to dilated cardiomyopathy and congestive heart failure. Recent studies have linked viral myocarditis with dysfunctions in endoplasmic reticulum (ER) mediated Ca(2+) homeostasis and the unfolded protein response (UPR). Currently there are no effective treatments for this viral infection. METHODS: We employed the use of a well-characterized pathogen coxsackievirus B3 (CVB3) to induce mouse viral myocarditis...
January 2016: Acta Cardiologica Sinica
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