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Myocardial ischemia and glucose

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https://www.readbyqxmd.com/read/28396253/moderate-therapeutic-hypothermia-induces-multimodal-protective-effects-in-oxygen-glucose-deprivation-reperfusion-injured-cardiomyocytes
#1
Jana Krech, Giang Tong, Sylvia Wowro, Christoph Walker, Lisa-Maria Rosenthal, Felix Berger, Katharina Rose Luise Schmitt
OBJECTIVE: Therapeutic hypothermia has been shown to attenuate myocardial cell death due to ischemia/reperfusion injury. However, cellular mechanisms of cooling remain to be elucidated. Especially during reperfusion, mitochondrial dysfunction contributes to cell death by releasing apoptosis inductors. The aim of the present study was to investigate the effects of moderate therapeutic hypothermia (33.5°C) on mitochondrial mediated apoptosis in ischemia/reperfusion-injured cardiomyocytes...
April 7, 2017: Mitochondrion
https://www.readbyqxmd.com/read/28386372/thioredoxin-2-protects-against-oxygen-glucose-deprivation-reperfusion-injury-by-inhibiting-autophagy-and-apoptosis-in-h9c2-cardiomyocytes
#2
Yan-Yan Li, Yin Xiang, Song Zhang, Yan Wang, Jie Yang, Wei Liu, Feng-Tai Xue
The aim of this study is to examine the role of thioredoxin-2 (Trx2) in autophagy and apoptosis during myocardial ischemia-reperfusion (I/R) injury in vitro. We employed the oxygen-glucose deprivation and reperfusion (OGD/R) model of H9c2 cells and used lentiviral infection to overexpress Trx2. H9c2 cell viability and injury assays were conducted using a Cell Counting Kit-8 (CCK-8) and alactate dehydrogenase (LDH) kit. The effects of Trx2 on autophagy and apoptosis were measured by transmission electron microscopy (TEM), western blot, and flow cytometry...
2017: American Journal of Translational Research
https://www.readbyqxmd.com/read/28377726/lysophosphatidic-acid-pretreatment-attenuates-myocardial-ischemia-reperfusion-injury-in-the-immature-hearts-of-rats
#3
Haibo Chen, Si Liu, Xuewen Liu, Jinjing Yang, Fang Wang, Xiangfeng Cong, Xi Chen
The cardioprotection of the immature heart during cardiac surgery remains controversial due to the differences between the adult heart and the newborn heart. Lysophosphatidic acid (LPA) is a small bioactive molecule with diverse functions including cell proliferation and survival via its receptor: LPA1-LPA6. We previously reported that the expressions of LPA1 and LPA3 in rat hearts were much higher in immature hearts and then declined rapidly with age. In this study, we aimed to investigate whether LPA signaling plays a potential protective role in immature hearts which had experienced ischemia/reperfusion (I/R) injury...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28376800/glycemia-and-the-cardioprotective-effects-of-insulin-pre-conditioning-in-the-isolated-rat-heart
#4
Yosuke Nakadate, Hiroaki Sato, Takeshi Oguchi, Tamaki Sato, Akiko Kawakami, Tadahiko Ishiyama, Takashi Matsukawa, Thomas Schricker
BACKGROUND: While acute hyperglycemia has been shown to mitigate the beneficial effects of ischemic preconditioning, its effect on insulin-induced preconditioning remains unclear. METHODS: The study was designed to test the hypothesis that acute hyperglycemia diminishes the cardioprotective effects following a 20-min pre-ischemic pre-conditioning with insulin in the isolated rat heart using the Langendorff system. Forty hearts were assigned to receive modified Krebs-Henseleit (KH) buffer containing 0...
April 4, 2017: Cardiovascular Diabetology
https://www.readbyqxmd.com/read/28369151/type-1-diabetes-developing-the-first-risk-estimation-model-for-predicting-silent-myocardial-ischemia-the-potential-role-of-insulin-resistance
#5
Gemma Llauradó, Albert Cano, Cristina Hernández, Montserrat González-Sastre, Ato-Antonio Rodríguez, Jordi Puntí, Eugenio Berlanga, Lara Albert, Rafael Simó, Joan Vendrell, José-Miguel González Clemente
OBJECTIVES: The aim of the study was to develop a novel risk estimation model for predicting silent myocardial ischemia (SMI) in patients with type 1 diabetes (T1DM) and no clinical cardiovascular disease, evaluating the potential role of insulin resistance in such a model. Additionally, the accuracy of this model was compared with currently available models for predicting clinical coronary artery disease (CAD) in general and diabetic populations. RESEARCH, DESIGN AND METHODS: Patients with T1DM (35-65years, >10-year duration) and no clinical cardiovascular disease were consecutively evaluated for: 1) clinical and anthropometric data (including classical cardiovascular risk factors), 2) insulin sensitivity (estimate of glucose disposal rate (eGDR)), and 3) SMI diagnosed by stress myocardial perfusion gated SPECTs...
2017: PloS One
https://www.readbyqxmd.com/read/28364393/lipid-emulsion-enhances-cardiac-performance-after-ischemia-reperfusion-in-isolated-hearts-from-summer-active-arctic-ground-squirrels
#6
Michele M Salzman, Qunli Cheng, Richard J Deklotz, Gurpreet K Dulai, Hunter F Douglas, Anna E Dikalova, Dorothee Weihrauch, Brian M Barnes, Matthias L Riess
Hibernating mammals, like the arctic ground squirrel (AGS), exhibit robust resistance to myocardial ischemia/reperfusion (IR) injury. Regulated preference for lipid over glucose to fuel metabolism may play an important role. We tested whether providing lipid in an emulsion protects hearts from summer-active AGS better than hearts from Brown Norway (BN) rats against normothermic IR injury. Langendorff-prepared AGS and BN rat hearts were perfused with Krebs solution containing 7.5 mM glucose with or without 1% Intralipid™...
March 31, 2017: Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology
https://www.readbyqxmd.com/read/28325730/glucose-oxidation-positively-regulates-glucose-uptake-and-improves-cardiac-function-recovery-after-myocardial-reperfusion
#7
Tingting Li, Jie Xu, Xinghua Qin, Zuoxu Hou, Yongzheng Guo, Zhenhua Liu, Jianjiang Wu, Hong Zheng, Xing Zhang, Feng Gao
Myocardial reperfusion decreases glucose oxidation and uncouples glucose oxidation from glycolysis. Therapies that increase glucose oxidation lessen myocardial ischemia/reperfusion injury. However, the regulation of glucose uptake during reperfusion remains poorly understood. Here we found that glucose uptake was remarkably diminished in myocardium following reperfusion in Sprague-Dawley rats as detected by 18F-labeled and fluorescent-labeled glucose analogs, even though GLUT1 was upregulated by 3 folds and GLUT4 translocation remained unchanged compared with those of sham rats...
March 21, 2017: American Journal of Physiology. Endocrinology and Metabolism
https://www.readbyqxmd.com/read/28303849/effect-of-metabolic-syndrome-score-metabolic-syndrome-and-its-individual-components-on-the-prevalence-and-severity-of-angiographic-coronary-artery-disease
#8
Ming-Hui Gui, Yan Ling, Lin Liu, Jing-Jing Jiang, Xiao-Ying Li, Xin Gao
BACKGROUND: The clinical significance of metabolic syndrome (MS) score, MS, and its individual components with respect to risk prediction of coronary artery disease (CAD) remains unclear. The objective of this study was to investigate whether and to what extent MS score, MS, and its individual components were related to the risk of CAD. METHODS: Among 1191 participants who underwent coronary angiography for the confirmation of suspected myocardial ischemia, 858 were included in this study according to the inclusion criteria from September 2010 to June 2013...
March 20, 2017: Chinese Medical Journal
https://www.readbyqxmd.com/read/28292026/catalpol-protects-glucose-deprived-rat-embryonic-cardiac-cells-by-inducing-mitophagy-and-modulating-estrogen-receptor
#9
Chao Lin, Ying Lu, Xiaojing Yan, Xiang Wu, Meiyu Kuai, Xin Sun, Qi Chen, Xueyun Kong, Zhaoguo Liu, Yuping Tang, Yi Jing, Yu Li, Qichun Zhang, Huimin Bian
Catalpol, a bioactive component from Rehmannia glutinosa (Di Huang), has been widely used to protect cardiomyocytes against myocardial ischemia. The aim of the present study was to investigate the anti-apoptotic and anti-oxidative effects of Catalpol on glucose-starved H9c2 cells for cardio-protection and to elucidate the underlying mechanisms. Here, we showed that Catalpol protected the glucose-starved H9c2 cells through reducing apoptosis and attenuating oxidative damage. Moreover, the increases of autophagic lysosomes, LC3, autophagic flux and autophagic vacuole were observed in Catalpol-treated cells using flow cytometer and fluorescence microscope...
March 9, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/28284926/moderate-short-term-local-hyperglycemia-attenuates-forearm-endothelium-dependent-vasodilation-after-transient-ischemia-reperfusion-in-human-volunteers
#10
Thomas J Ebert, Jutta Novalija, Jill A Barney, Toni D Uhrich, Shahbaz R Arain, Julie K Freed, Paul S Pagel
OBJECTIVE: Acute hyperglycemia causes endothelial dysfunction in diabetic patients, abolishes ischemic pre- and postconditioning, and is an independent predictor of adverse outcome after myocardial infarction in nondiabetic patients. Its effects on endothelial-dependent vasodilation are controversial in healthy subjects. The authors studied the effect of moderate short-term local hyperglycemia on forearm endothelium-dependent vasodilation in healthy volunteers. DESIGN: Randomized, crossover, blinded, 2-visit, pilot design...
December 2, 2016: Journal of Cardiothoracic and Vascular Anesthesia
https://www.readbyqxmd.com/read/28281660/dpp-4-inhibitor-and-estrogen-share-similar-efficacy-against-cardiac-ischemic-reperfusion-injury-in-obese-insulin-resistant-and-estrogen-deprived-female-rats
#11
Sivaporn Sivasinprasasn, Pongpan Tanajak, Wanpitak Pongkan, Wasana Pratchayasakul, Siriporn C Chattipakorn, Nipon Chattipakorn
Estrogen deprivation aggravates cardiac injury after myocardial ischemia and reperfusion (I/R) injury. Although either estrogen or the dipeptidyl peptidase-4 (DPP-4) inhibitor, vildagliptin, reduces myocardial damage following cardiac I/R, their effects on the heart in obese-insulin resistant and estrogen deprived conditions remain unknown. Ovariectomized (O) rats (n = 36) were divided to receive either normal diet (NDO) or high-fat diet (HFO) for 12 weeks, followed by treatment with a vehicle, estrogen or vildagliptin for 4 weeks...
March 10, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28191472/suppression-of-excessive-histone-deacetylases-activity-in-diabetic-hearts-attenuates-myocardial-ischemia-reperfusion-injury-via-mitochondria-apoptosis-pathway
#12
Yang Wu, Yan Leng, Qingtao Meng, Rui Xue, Bo Zhao, Liying Zhan, Zhongyuan Xia
Background. Histone deacetylases (HDACs) play a pivotal role in signaling modification and gene transcriptional regulation that are essential for cardiovascular pathophysiology. Diabetic hearts with higher HDACs activity were more vulnerable to myocardial ischemia/reperfusion (MI/R) injury compared with nondiabetic hearts. We are curious about whether suppression of excessive HDACs activity in diabetic heart protects against MI/R injury. Methods. Diabetic rats were subjected to 45 min of ischemia, followed by 3 h of reperfusion...
2017: Journal of Diabetes Research
https://www.readbyqxmd.com/read/28188434/bloodless-reperfusion-with-the-oxygen-carrier-hboc-201-in-acute-myocardial-infarction-a-novel-platform-for-cardioprotective-probes-delivery
#13
Jose M García-Ruiz, Carlos Galán-Arriola, Rodrigo Fernández-Jiménez, Jaume Aguero, Javier Sánchez-González, Ana García-Alvarez, Mario Nuno-Ayala, Gregory P Dubé, Zafiris Zafirelis, Gonzalo J López-Martín, Juan A Bernal, Enrique Lara-Pezzi, Valentín Fuster, Borja Ibáñez
Reperfusion, despite being required for myocardial salvage, is associated with additional injury. We hypothesize that infarct size (IS) will be reduced by a period of bloodless reperfusion with hemoglobin-based oxygen carriers (HBOC) before blood-flow restoration. In the pig model, we first characterized the impact of intracoronary perfusion with a fixed volume (600 ml) of a pre-oxygenated acellular HBOC, HBOC-201, on the healthy myocardium. HBOC-201 was administered through the lumen of the angioplasty balloon (i...
March 2017: Basic Research in Cardiology
https://www.readbyqxmd.com/read/28126733/glycation-abolishes-the-cardioprotective-effects-of-albumin-during-ex%C3%A2-vivo-ischemia-reperfusion
#14
Rudo F Mapanga, Danzil E Joseph, Marco Saieva, Florence Boyer, Philippe Rondeau, Emmanuel Bourdon, M Faadiel Essop
Hyperglycemia-induced oxidative stress plays a key role in the onset/progression of cardiovascular diseases. For example, it can trigger formation of advanced glycation end (AGE) products with ischemia-reperfusion performed under hyperglycemic conditions. For this study, we hypothesized that albumin modified by glycation loses its unique cardioprotective properties in the setting of ischemia-reperfusion under high glucose conditions. Here, ex vivo rat heart perfusions were performed under simulated normo- and hyperglycemic conditions, that is Krebs-Henseleit buffer containing 11 mmol/L and 33 mmol/L glucose, respectively, ± normal or glycated albumin preparations...
January 2017: Physiological Reports
https://www.readbyqxmd.com/read/28123046/pde5-inhibitor-tadalafil-and-hydroxychloroquine-cotreatment-provides-synergistic-protection-against-type-2-diabetes-and-myocardial-infarction-in-mice
#15
Rui Wang, Lei Xi, Rakesh C Kukreja
Diabetes is associated with a high risk for ischemic heart disease. We have previously shown that phosphodiesterase 5 inhibitor tadalafil (TAD) induces cardioprotection against ischemia/ reperfusion (I/R) injury in diabetic mice. Hydroxychloroquine (HCQ) is a widely used antimalarial and anti-inflammatory drug that has been reported to reduce hyperglycemia in diabetic patients. Therefore, we hypothesized that a combination of TAD and HCQ may induce synergistic cardioprotection in diabetes. We also investigated the role of insulin-Akt-mammalian target of rapamycin (mTOR) signaling, which regulates protein synthesis and cell survival...
April 2017: Journal of Pharmacology and Experimental Therapeutics
https://www.readbyqxmd.com/read/28096195/the-multifunctional-mitochondrial-epac1-controls-myocardial-cell-death
#16
Loubina Fazal, Marion Laudette, Sílvia Paula-Gomes, Sandrine Pons, Caroline Conte, Florence Tortosa, Pierre Sicard, Yannis Sainte-Marie, Malik Bisserier, Olivier Lairez, Alexandre Lucas, Jérôme Roy, Bijan Ghaleh, Jeremy Fauconnier, Jeanne Mialet-Perez, Frank Lezoualc'h
RATIONALE: Although the second messenger cyclic AMP (cAMP) is physiologically beneficial in the heart, it largely contributes to cardiac disease progression when dysregulated. Current evidence suggests that cAMP is produced within mitochondria. However, mitochondrial cAMP signaling and its involvement in cardiac pathophysiology are far from being understood. OBJECTIVE: To investigate the role of mitochondrial exchange protein directly activated by cAMP 1 (MitEpac1) in ischemia/reperfusion (I/R) injury...
January 17, 2017: Circulation Research
https://www.readbyqxmd.com/read/28089149/fasting-glucose-nt-probnp-treatment-with-eptifibatide-and-outcomes-in-non-st-segment-elevation-acute-coronary-syndromes-an-analysis-from-early-acs
#17
Serdar Farhan, Robert M Clare, Rudolf Jarai, Robert P Giugliano, Yuliya Lokhnygina, Robert A Harrington, L Kristin Newby, Kurt Huber
BACKGROUND: Higher N-terminal pro-B-type natriuretic peptide (NT-proBNP) levels have been linked to a more favorable glucometabolic profile. Little is known about the interaction of NT-proBNP and fasting glucose in non-ST-segment elevation acute coronary syndrome (NSTE ACS). METHODS: Fasting glucose and NT-proBNP were measured in 2240 patients enrolled in the EARLY ACS trial. Multivariable Cox models were used to assess associations between fasting glucose and NT-proBNP and a 96-hour composite of death, myocardial infarction (MI), recurrent ischemia, or thrombotic bailout; 30-day death or MI; and 1-year mortality...
April 1, 2017: International Journal of Cardiology
https://www.readbyqxmd.com/read/28038474/inhibition-of-aldh2-by-o-glcnacylation-contributes-to-the-hyperglycemic-exacerbation-of-myocardial-ischemia-reperfusion-injury
#18
Baoshan Liu, Jiali Wang, Minghua Li, Qiuhuan Yuan, Mengyang Xue, Feng Xu, Yuguo Chen
Although hyperglycemia is causally related to adverse outcomes after myocardial ischemia/reperfusion (I/R), the underlying mechanisms are largely unknown. Here, we investigated whether excessive O-linked-N-acetylglucosamine (O-GlcNAc) modification of acetaldehyde dehydrogenase 2 (ALDH2), an important cardioprotective enzyme, was a mechanism for the hyperglycemic exacerbation of myocardial I/R injury. Both acute hyperglycemia (AHG) and diabetes (DM)-induced chronic hyperglycemia increased cardiac dysfunction, infarct size and apoptosis index compared with normal saline (NS)+I/R rats (P<0...
March 21, 2017: Oncotarget
https://www.readbyqxmd.com/read/28034463/glucose-transporters-in-healthy-heart-and-in-cardiac-disease
#19
REVIEW
Leszek Szablewski
Heart consumes more energy than any other organ. It can utilize various metabolic substrates as a source of energy. The primary substrates are free fatty acids, especially long-chain fatty acids and glucose. The lipid bilayer of plasmalemma is impermeable for glucose. Therefore, glucose transport across the plasma membrane is mediated via glucose transporters. In human, cardiac cells are expressed as 2 families of glucose transporters: GLUTs and SGLTs. These transport proteins are GLUT1, GLUT3, GLUT8, GLUT10, GLUT11, GLUT12 and SGLT1...
March 1, 2017: International Journal of Cardiology
https://www.readbyqxmd.com/read/27993557/inhibition-of-endoplasmic-reticulum-stress-by-neuregulin-1-protects-against-myocardial-ischemia-reperfusion-injury
#20
Shan-Juan Fang, Peng-Yang Li, Chun-Mei Wang, Yi Xin, Wei-Wei Lu, Xiao-Xia Zhang, Song Zuo, Chang-Sheng Ma, Chao-Shu Tang, Shao-Ping Nie, Yong-Fen Qi
Neuregulin-1 (NRG-1), an endogenously produced polypeptide, is the ligand of cardiomyocyte ErbB receptors, with cardiovascular protective effects. In the present study, we explored whether the cardioprotective effect of NRG-1 against I/R injury is mediated by inhibiting myocardial endoplasmic reticulum (ER) stress. In vitro, NRG-1 directly inhibited the upregulation of ER stress markers such as glucose-regulated protein 78, CCAAT/enhancer binding protein homologous protein and cleaved caspase-12 induced by the ER stress inducers tunicamycin or dithiothreitol in both neonatal and adult ventricular myocytes...
February 2017: Peptides
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