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Myocardial ischemia and glucose

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https://www.readbyqxmd.com/read/27909014/sodium-4-phenylbutyrate-attenuates-myocardial-reperfusion-injury-by-reducing-the-unfolded-protein-response
#1
Osamu Takatori, Soichiro Usui, Masaki Okajima, Shuichi Kaneko, Hiroshi Ootsuji, Shin-Ichiro Takashima, Daisuke Kobayashi, Hisayoshi Murai, Hiroshi Furusho, Masayuki Takamura
BACKGROUND: The unfolded protein response (UPR) plays a pivotal role in ischemia-reperfusion (I/R) injury in various organs such as heart, brain, and liver. Sodium 4-phenylbutyrate (PBA) reportedly acts as a chemical chaperone that reduces UPR. In the present study, we evaluated the effect of PBA on reducing the UPR and protecting against myocardial I/R injury in mice. METHODS: Male C57BL/6 mice were subjected to 30-minute myocardial I/R, and were treated with phosphate-buffered saline (as a vehicle) or PBA...
December 1, 2016: Journal of Cardiovascular Pharmacology and Therapeutics
https://www.readbyqxmd.com/read/27865836/g-protein-coupled-kinase-2-upregulation-causes-%C3%AE%C2%BA-opioid-receptor-desensitization-in-diabetic-heart
#2
Xiyao Chen, Shihao Zhao, Yunlong Xia, Zhenyu Xiong, Yueyang Li, Ling Tao, Fuyang Zhang, Xiaoming Wang
Activation of κ-opioid receptor (KOR) ameliorates myocardial ischemia/reperfusion (I/R) injury; however, cardioprotective effects of KOR stimulation disappear in type 1 diabetic subjects with hyperglycemia. The molecular mechanisms underlying this phenomenon remain unknown. Here we found that KOR expression was obviously downregulated and KOR agonism-induced contractile-regulatory/cardioprotective effects were significantly impaired in hearts isolated from streptozotocin (STZ) injection-induced diabetic mice...
November 16, 2016: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/27829984/activation-of-aldh2-with-low-concentration-of-ethanol-attenuates-myocardial-ischemia-reperfusion-injury-in-diabetes-rat-model
#3
Pin-Fang Kang, Wen-Juan Wu, Yang Tang, Ling Xuan, Su-Dong Guan, Bi Tang, Heng Zhang, Qin Gao, Hong-Ju Wang
The aim of this paper is to observe the change of mitochondrial aldehyde dehydrogenase 2 (ALDH2) when diabetes mellitus (DM) rat heart was subjected to ischemia/reperfusion (I/R) intervention and analyze its underlying mechanisms. DM rat hearts were subjected to 30 min regional ischemia and 120 min reperfusion in vitro and pretreated with ALDH2 activator ethanol (EtOH); cardiomyocyte in high glucose (HG) condition was pretreated with ALDH2 activator Alda-1. In control I/R group, myocardial tissue structure collapse appeared...
2016: Oxidative Medicine and Cellular Longevity
https://www.readbyqxmd.com/read/27807222/the-emerging-role-of-thioredoxin-interacting-protein-in-myocardial-ischemia-reperfusion-injury
#4
Bing F Wang, Jun Yoshioka
Myocardial ischemia/reperfusion injury represents a major threat to human health and contributes to adverse cardiovascular outcomes worldwide. Despite the identification of numerous molecular mechanisms, understanding of the complex pathophysiology of this clinical syndrome remains incomplete. Thioredoxin-interacting protein (Txnip) has been of great interest in the past decade since it has been reported to be a critical regulator in human diseases with several important cellular functions. Thioredoxin-interacting protein binds to and inhibits thioredoxin, a redox protein that neutralizes reactive oxygen species (ROS), and through its interaction with thioredoxin, Txnip sensitizes cardiomyocytes to ROS-induced apoptosis...
November 2, 2016: Journal of Cardiovascular Pharmacology and Therapeutics
https://www.readbyqxmd.com/read/27796760/downregulation-of-nad-dependent-deacetylase-sirt2-protects-mouse-brain-against-ischemic-stroke
#5
Xiao Qiang Xie, Pei Zhang, Bo Tian, Xiao Qian Chen
Sirtuin 2 (SIRT2) is a member of NAD(+)-dependent protein deacetylases involved in a wide range of pathophysiological processes including myocardial injury, Parkinson's disease, and Huntington's disease. However, the direct implication of SIRT2 in ischemic stroke is still unclear. In the present study, we observed that SIRT2 protein was mainly expressed in the cytoplasm of neurons, but not in astrocyte and microglia. SIRT2 was upregulated in ischemic neurons in the oxygen-glucose deprivation cell model and in the transient middle cerebral artery occlusion (tMCAo) mouse model...
October 29, 2016: Molecular Neurobiology
https://www.readbyqxmd.com/read/27785700/naringenin-ameliorates-hypoxia-reoxygenation-induced-endoplasmic-reticulum-stress-mediated-apoptosis-in-h9c2-myocardial-cells-involvement-in-atf6-ire1%C3%AE-and-perk-signaling-activation
#6
Jia-You Tang, Ping Jin, Qing He, Lin-He Lu, Ji-Peng Ma, Wei-Lun Gao, He-Ping Bai, Jian Yang
Naringenin, a flavanone mainly derived from grapes and citrus fruits, has been reported to exhibit cardioprotective effects. Accumulating evidence has confirmed that endoplasmic reticulum (ER) stress-mediated apoptosis participates in the process of myocardial ischemia/reperfusion injury and inhibiting ER stress is a potential therapeutic target/strategy in preventing cardiovascular diseases. Herein, the current study was designed to investigate whether naringenin protects H9c2 myocardial cells against hypoxia/reoxygenation (H/R) injury via attenuating ER stress or ER stress-mediated apoptosis...
October 26, 2016: Molecular and Cellular Biochemistry
https://www.readbyqxmd.com/read/27773717/cardioprotective-effects-of-monocyte-locomotion-inhibitory-factor-on-myocardial-ischemic-injury-by-targeting-vimentin
#7
Shu Jiang, Yulan Liu, Jing Wang, Yue Zhang, Yaocheng Rui, Yuefan Zhang, Tiejun Li
Monocyte locomotion inhibitory factor (MLIF), a heat-stable pentapeptide produced by Entamoeba histolytica, has anti-inflammatory function and protective effect on ischemic stroke. In this study, we evaluated the effect of MLIF on myocardial ischemia. The myocardial ischemia reperfusion (I/R) model was established by ligation of the left anterior descending branch (LAD) using 8-0 silk suture for 30min followed by 3h reperfusion in mice. After sacrifice, the serum concentrations of cardiac troponin I (cTnI), creatine kinase (CK), lactate dehydrogenase (LDH) as well as the heart infarct size were measured...
October 20, 2016: Life Sciences
https://www.readbyqxmd.com/read/27768055/methods-for-the-determination-of-rates-of-glucose-and-fatty-acid-oxidation-in-the-isolated-working-rat-heart
#8
Bhavisha Bakrania, Joey P Granger, Romain Harmancey
The mammalian heart is a major consumer of ATP and requires a constant supply of energy substrates for contraction. Not surprisingly, alterations of myocardial metabolism have been linked to the development of contractile dysfunction and heart failure. Therefore, unraveling the link between metabolism and contraction should shed light on some of the mechanisms governing cardiac adaptation or maladaptation in disease states. The isolated working rat heart preparation can be used to follow, simultaneously and in real time, cardiac contractile function and flux of energy providing substrates into oxidative metabolic pathways...
September 28, 2016: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/27764756/klf5-overexpression-attenuates-cardiomyocyte-inflammation-induced-by-oxygen-glucose-deprivation-reperfusion-through-the-ppar%C3%AE-pgc-1%C3%AE-tnf-%C3%AE-signaling-pathway
#9
Yang Li, Jian Li, Zhiwen Hou, Yang Yu, Bo Yu
The primary physiological function of Krüppel-like zinc-finger transcription factor (KLF5) is the regulation of cardiovascular remodeling. Vascular remodeling is closely related to the amelioration of various ischemic diseases. However, the underlying correlation of KLF5 and ischemia is not clear. In this study, we aim to investigate the role of KLF5 in myocardial ischemia reperfusion (IR) injury and the potential mechanisms involved. Cultured H9C2 cells were subjected to oxygen-glucose deprivation/reperfusion (OGD/Rep) to mimic myocardial IR injury in vivo...
October 17, 2016: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/27753144/melatonin-rescues-cardiac-thioredoxin-system-during-ischemia-reperfusion-injury-in-acute-hyperglycemic-state-by-restoring-notch1-hes1-akt-signaling-in-a-membrane-receptor-dependent-manner
#10
Liming Yu, Chongxi Fan, Zhi Li, Jian Zhang, Xiaodong Xue, Yinli Xu, Guolong Zhao, Yang Yang, Huishan Wang
Stress hyperglycemia is commonly observed in patients suffering from ischemic heart disease. It not only worsens cardiovascular prognosis but also attenuates the efficacies of various cardioprotective agents. This study aimed to investigate the protective effect of melatonin against myocardial ischemia-reperfusion (MI/R) injury in acute hyperglycemic state with a focus on Notch1/Hes1/Akt signaling and intracellular thioredoxin (Trx) system. Sprague-Dawley rats were subjected to MI/R surgery and high glucose (HG, 500 g/L) infusion (4 ml/kg/h) to induce temporary hyperglycemia...
October 18, 2016: Journal of Pineal Research
https://www.readbyqxmd.com/read/27733157/n-acetylcysteine-attenuates-myocardial-dysfunction-and-postischemic-injury-by-restoring-caveolin-3-enos-signaling-in-diabetic-rats
#11
Wating Su, Yuan Zhang, Qiongxia Zhang, Jinjin Xu, Liying Zhan, Qiqi Zhu, Qingquan Lian, Huimin Liu, Zhong-Yuan Xia, Zhengyuan Xia, Shaoqing Lei
BACKGROUND: Patients with diabetes are prone to develop cardiac hypertrophy and more susceptible to myocardial ischemia-reperfusion (I/R) injury, which are concomitant with hyperglycemia-induced oxidative stress and impaired endothelial nitric oxide (NO) synthase (eNOS)/NO signaling. Caveolae are critical in the transduction of eNOS/NO signaling in cardiovascular system. Caveolin (Cav)-3, the cardiomyocytes-specific caveolae structural protein, is decreased in the diabetic heart in which production of reactive oxygen species are increased...
October 12, 2016: Cardiovascular Diabetology
https://www.readbyqxmd.com/read/27696561/evaluation-of-the-relationship-between-microalbuminuria-and-urine-ischemia-modified-albumin-levels-in-patients-with-diabetic-nephropathy
#12
Mustafa Bilgi, Ahmet Keser, Huseyin Katlandur, Emel Sahin, Ali Osman Kalkan, Murat Yildiz, Aysel Kiyici, Mustafa Keles
INTRODUCTION: Ischemia-modified albumin (IMA) is a marker which can be associated with oxidative stress in various ischemic and non-ischemic processes. Oxidative stress plays roles in diabetes mellitus, its complications and pathogenesis. Serum IMA levels are examined in various clinical events. However, urine IMA levels have not yet been evaluated in diabetic patients. In this study, we aim to examine the relationship between metabolic features and urine microalbuminuria levels of diabetic patients and their urine IMA levels...
October 1, 2016: Journal of Clinical Laboratory Analysis
https://www.readbyqxmd.com/read/27695290/protein-kinase-c-mediated-sodium-glucose-transporter-1-activation-in-precondition-induced-cardioprotection
#13
Abhinav Kanwal, Sujatha Kasetti, Uday Kumar Putcha, Shailendra Asthana, Sanjay K Banerjee
The concept of cardioprotection through preconditioning against ischemia-reperfusion (I/R) injury is well known and established. However, among different proposed mechanisms regarding the concept of ischemic preconditioning, protein kinase C (PKC)-mediated cardioprotection through ischemic preconditioning plays a key role in myocardial I/R injury. Thus, this study was designed to find the relationship between PKC and sodium glucose transporter 1 (SGLT1) in preconditioning-induced cardioprotection, which is ill reported till now...
2016: Drug Design, Development and Therapy
https://www.readbyqxmd.com/read/27621180/metformin-protects-against-infection-induced-myocardial-dysfunction
#14
Theodora Tzanavari, Aimilia Varela, Stamatis Theocharis, Elpinickie Ninou, Alkistis Kapelouzou, Dennis V Cokkinos, Maria I Kontaridis, Katia P Karalis
BACKGROUND AND PURPOSE: Metformin administration is associated with myocardial protection during ischemia and/or reperfusion, possibly via inhibition of inflammatory responses in the heart. Exposure to pathogens, in addition to the activation of the immune system and the associated metabolic dysfunction, often results in compromised myocardial function. We examined whether metformin administration could maintain the normal myocardial function in experimental moderate Gram negative infection, induced by lipopolysaccharide (LPS) administration...
October 2016: Metabolism: Clinical and Experimental
https://www.readbyqxmd.com/read/27615447/intermittent-hypoxia-in-obese-zucker-rats-cardiometabolic-and-inflammatory-effects
#15
Anne Briançon-Marjollet, Denis Monneret, Marion Henri, Marie Joyeux-Faure, Perle Totoson, Sandrine Cachot, Patrice Faure, Diane Godin-Ribuot
What is the central question of this study? This study addresses the relative impact of obesity and intermittent hypoxia in the pathophysiological process of obstructive sleep apnoea by investigating the metabolic, inflammatory and cardiovascular consequences of intermittent hypoxia in lean and obese Zucker rats. What is the main finding and its importance? We found that obesity and intermittent hypoxia have mainly distinct consequences on the investigated inflammatory and cardiometabolic parameters in Zucker rats...
October 5, 2016: Experimental Physiology
https://www.readbyqxmd.com/read/27614227/reduced-mitochondrial-respiration-in-the-ischemic-as-well-as-in-the-remote-non-ischemic-region-in-post-myocardial-infarction-remodeling
#16
Diogo T Galan, Virginie Bito, Piet Claus, Patricia Holemans, Joëlle Abi-Char, Chandan Kadur Nagaraju, Eef Dries, Kristel Vermeulen, Renee Ventura-Clapier, Karin R Sipido, Ronald B Driesen
Scarring and remodeling of the left ventricle (LV) after myocardial infarction (MI) results in ischemic cardiomyopathy with reduced contractile function. Regional differences related to persisting ischemia may exist. We investigated the hypothesis that mitochondrial function and structure is altered in the myocardium adjacent to MI with reduced perfusion (MIadjacent) and less so in the remote, non-ischemic myocardium (MIremote). We used a pig model of chronic coronary stenosis and MI (N=13). Functional and perfusion MR imaging 6 weeks after intervention showed reduced ejection fraction and increased global wall stress compared to sham-operated animals (SHAM; N=14)...
September 9, 2016: American Journal of Physiology. Heart and Circulatory Physiology
https://www.readbyqxmd.com/read/27565986/risk-factors-for-silent-myocardial-ischemia-in-patients-with-well-controlled-essential-hypertension
#17
Domenico Rendina, Renato Ippolito, Gianpaolo De Filippo, Riccardo Muscariello, Daniela De Palma, Silvana De Bonis, Michele Schiano di Cola, Domenico Benvenuto, Maurizio Galderisi, Pasquale Strazzullo, Ferruccio Galletti
Silent myocardial ischemia (SMI) is frequently observed in patients with essential hypertension (EH). The major risk factor for SMI is uncontrolled blood pressure (BP), but SMI is also observed in patients with well-controlled BP. To evaluate the prevalence of SMI and the factors associated with SMI in EH patients with well-controlled BP. The medical records of 859 EH patients who underwent simultaneous 24-h ambulatory blood pressure monitoring (ABPM) and 24-h ambulatory electrocardiogram recording (AECG) were retrospectively evaluated...
August 26, 2016: Internal and Emergency Medicine
https://www.readbyqxmd.com/read/27561881/in-vivo-dynamic-metabolic-changes-after-transplantation-of-induced-pluripotent-stem-cells-for-ischemic-injury
#18
Shuang Wu, Yuankai Zhu, Hao Liu, Ling Tang, Ruili Du, Yehua Shen, Jin Feng, Kai Zhang, Caiyun Xu, Shouhong Zhang, Yao Chen, Fahuan Song, Yunqi Zhu, Weizhong Gu, Ping Liang, Ignasi Carrió, Hong Zhang, Mei Tian
: This study aimed to investigate in vivo dynamic metabolic changes after transplantation of induced pluripotent stem cells (iPSCs) and iPSC-derived enriched cardiomyocytes (iPSC-CMs) in a rat model of ischemic injury. METHODS: Serial (18)F-FDG PET, echocardiographic, immunohistochemical, and immunofluorescence studies were performed after transplantation of iPSCs and iPSC-CMs and compared with embryonic stem cells (ESCs), ESC-CMs, and a phosphate-buffered saline control group of rats with myocardial infarction...
December 2016: Journal of Nuclear Medicine: Official Publication, Society of Nuclear Medicine
https://www.readbyqxmd.com/read/27517612/insulin-in-acute-coronary-syndrome-a-narrative-review-with-contemporary-perspectives
#19
Michael C Y Nam, Christopher D Byrne, Juan Carlos Kaski, Kim Greaves
The role of insulin in the treatment of acute coronary syndrome (ACS) has been widely studied over the past 100 years. The current indication for its use in this context is the treatment of hyperglycemia, irrespective of diabetes, which is associated with adverse outcome. Initial theories proposed that glucose was beneficial in the context of myocardial ischemia and insulin was required to enable glucose cell uptake. However, studies testing this hypothesis with routine insulin administration during ACS have produced disappointing results and research interest has therefore declined...
October 2016: Cardiovascular Drugs and Therapy
https://www.readbyqxmd.com/read/27498780/effects-of-linagliptin-and-liraglutide-on-glucose-and-angiotensin-ii-induced-collagen-formation-and-cytoskeleton-degradation-in-cardiac-fibroblasts-in-vitro
#20
Xian-Wei Wang, Fen-Xi Zhang, Fen Yang, Zu-Feng Ding, Nidhi Agarwal, Zhi-Kun Guo, Jawahar L Mehta
AIM: Glucagon-like peptide-1 (GLP-1) agonists and dipeptidyl peptidase-4 (DPP-4) inhibitors can not only lower blood glucose levels, but also alleviate cardiac remodeling after myocardial ischemia and hypertension. In the present study, we investigated the effects of a DPP-4 inhibitor (linagliptin) and a GLP-1 activator (liraglutide) on glucose- and angiotensin II (Ang II)-induced collagen formation and cytoskeleton reorganization in cardiac fibroblasts in vitro, and elucidated the related mechanisms...
September 2016: Acta Pharmacologica Sinica
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