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Cardiac viability

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https://www.readbyqxmd.com/read/28430739/downstream-indication-to-revascularization-following-hybrid-cardiac-pet-mri-preliminary-results
#1
Julien Priamo, Dionysos Adamopoulos, Oliver Rager, Angela Frei, Stephane Noble, David Carballo, Osman Ratib, René Nkoulou
BACKGROUND: Hybrid PET/MRI allows the acquisition of both fluorine-18-fluorodeoxyglucose (F-FDG) PET and cardiac magnetic resonance (CMR) during one session. Whether this will result in different referral to coronary revascularization (CR) is unknown. We compared this new hybrid method with all-nuclear/all-CMR methods in the assessment of viable myocardium and in downstream referral to CR. PATIENTS AND METHODS: Overall, 12 patients with rest perfusion defects on a single photon emission computed tomography (SPECT) were recruited for cardiac viability assessment using a PET/MRI device...
April 20, 2017: Nuclear Medicine Communications
https://www.readbyqxmd.com/read/28423986/global-longitudinal-strain-from-resting-echocardiogram-is-associated-with-long-term-adverse-cardiac-outcomes-in-patients-with-suspected-coronary-artery-disease
#2
Ajay Yadlapati, Timothy R Maher, James D Thomas, Mark Gajjar, Kofo O Ogunyankin, Jyothy J Puthumana
PURPOSE: Measuring myocardial strain using two-dimensional speckle tracking echocardiography has emerged as a new tool to identify subclinical ventricular dysfunction. Abnormal strain has been shown to have superior sensitivity compared with dobutamine stress echocardiography for viability assessment; however, there is a paucity of data regarding the prediction of long-term major adverse cardiac events. We compared the prognostic ability of both global longitudinal strain (GLS) from resting echocardiograms to regional wall motion score index (WMSI) from stress echocardiograms in their ability to predict long-term major adverse cardiac events...
March 1, 2017: Perfusion
https://www.readbyqxmd.com/read/28423616/suppression-of-microrna-16-protects-against-acute-myocardial-infarction-by-reversing-beta2-adrenergic-receptor-down-regulation-in-rats
#3
Jiaqi Liu, Fei Sun, Yuying Wang, Wanqi Yang, Hongwen Xiao, Yue Zhang, Renzhong Lu, Haixia Zhu, Yuting Zhuang, Zhenwei Pan, Zhiguo Wang, Zhimin Du, Yanjie Lu
microRNA-16 (miR-16) has been shown to be up-regulated in ischemic heart. Beta2-adrenoreceptor (β2-AR) exerts cardioprotective property in ischemic injury. This study aims to determine the effect of miR-16 in cardiac injury in rats and the possible involvement of β2-AR in this process. Acute myocardial infarction (AMI) model in rats was induced by ligation of left coronary artery. Neonatal rat ventricular cells (NRVCs) were cultured in vitro tests. The cardiomyocyte model of oxidative injury was mimicked by hydrogen peroxide...
March 21, 2017: Oncotarget
https://www.readbyqxmd.com/read/28421129/protective-effects-of-dinitrosyl-iron-complexes-under-oxidative-stress-in-the-heart
#4
Valery I Kapelko, Vladimir L Lakomkin, Alexander A Abramov, Elena V Lukoshkova, Nidas A Undrovinas, Asker Y Khapchaev, Vladimir P Shirinsky
Background. Nitric oxide can successfully compete with oxygen for sites of electron-transport chain in conditions of myocardial hypoxia. These features may prevent excessive oxidative stress occurring in cardiomyocytes during sudden hypoxia-reoxygenation. Aim. To study the action of the potent stable NO donor dinitrosyl iron complex with glutathione (Oxacom®) on the recovery of myocardial contractile function and Ca(2+) transients in cardiomyocytes during hypoxia-reoxygenation. Results. The isolated rat hearts were subjected to 30 min hypoxia followed by 30 min reoxygenation...
2017: Oxidative Medicine and Cellular Longevity
https://www.readbyqxmd.com/read/28420436/autophagy-mediates-the-beneficial-effect-of-hypoxic-preconditioning-on-bone-marrow-mesenchymal-stem-cells-for-the-therapy-of-myocardial-infarction
#5
Zheng Zhang, Chao Yang, Mingzhi Shen, Ming Yang, Zhitao Jin, Liping Ding, Wei Jiang, Junke Yang, Haixu Chen, Feng Cao, Taohong Hu
BACKGROUND: Stem cell therapy has emerged as a promising therapeutic strategy for myocardial infarction (MI). However, the poor viability of transplanted stem cells hampers their therapeutic efficacy. Hypoxic preconditioning (HPC) can effectively promote the survival of stem cells. The aim of this study was to investigate whether HPC improved the functional survival of bone marrow mesenchymal stem cells (BM-MSCs) and increased their cardiac protective effect. METHODS: BM-MSCs, isolated from Tg(Fluc-egfp) mice which constitutively express both firefly luciferase (Fluc) and enhanced green fluorescent protein (eGFP), were preconditioned with HPC (1% O2) for 12 h, 24 h, 36 h, and 48 h, respectively, followed by 24 h of hypoxia and serum deprivation (H/SD) injury...
April 18, 2017: Stem Cell Research & Therapy
https://www.readbyqxmd.com/read/28393762/engineering-a-functional-three-dimensional-human-cardiac-tissue-model-for-drug-toxicity-screening
#6
Hong Fang Lu, Meng Leong, Tze Lim, Ying Ping Chua, Jia Kai Lim, Chan Du, Andrew C A Wan
Cardiotoxicity is one of the major reasons for clinical drug attrition. In vitro tissue models that can provide efficient and accurate drug toxicity screening are highly desired for preclinical drug development and personalized therapy. Here, we report the fabrication and characterization of a human cardiac tissue model for high throughput drug toxicity studies. Cardiac tissues were fabricated via cellular self-assembly of human transgene-free iPSC-derived cardiomyocytes in pre-fabricated polydimethylsiloxane molds...
April 10, 2017: Biofabrication
https://www.readbyqxmd.com/read/28392447/s-nitrosation-of-calpains-is-associated-with-cardioprotection-in-myocardial-i-r-injury
#7
Matthias Totzeck, Sebastian Korste, Ilkka Miinalainen, Ulrike B Hendgen-Cotta, Tienush Rassaf
BACKGROUND: Myocardial infarction remains the single leading cause of death worldwide. Upon reperfusion of occluded arteries, deleterious cellular mediators particularly located at the mitochondria level can be activated, thus limiting the outcome in patients. This may lead to the so-called ischemia/reperfusion (I/R) injury. Calpains are cysteine proteases and mediators of caspase-independent cell death. Recently, they have emerged as central transmitters of cellular injury in several cardiac pathologies e...
April 6, 2017: Nitric Oxide: Biology and Chemistry
https://www.readbyqxmd.com/read/28391263/salvianolic-acid-a-protects-h9c2-cells-from-arsenic-trioxide-induced-injury-via-inhibition-of-the-mapk-signaling-pathway
#8
Jing-Yi Zhang, Gui-Bo Sun, Yun Luo, Min Wang, Wei Wang, Yu-Yang Du, Ying-Li Yu, Xiao-Bo Sun
BACKGROUND/AIMS: This study aimed to investigate whether Salvianolic acid A (Sal A) conferred cardiac protection against Arsenic trioxide (ATO)-induced cardiotoxicity in H9c2 cells by inhibiting MAPK pathways activation. METHODS: H9c2 cardiac cells were exposed to 10 µM ATO for 24 h to induce cytotoxicity. The cells were pretreated with Sal A for 4 h before exposure to ATO. Cell viability was determined utilizing the MTT assay. The percentage of apoptosis was measured by a FITC-Annexin V/PI apoptosis kit for flow cytometry...
April 7, 2017: Cellular Physiology and Biochemistry
https://www.readbyqxmd.com/read/28386845/sub-physiological-oxygen-levels-optimal-for-growth-and-survival-of-human-atrial-cardiac-stem-cells
#9
Deepthi Sreerengam RajendranNair, Jayakumar Karunakaran, Renuka R Nair
Cardiac stem cells reside in niches where the oxygen levels are close to 3%. For cytotherapy, cells are conventionally expanded in ambient oxygen (21% O2) which represents hyperoxia compared to the oxygen tension of niches. Cardiosphere-derived cells (CDCs) are then transplanted to host tissue with lower-O2 levels. The high-O2 gradient can reduce the efficacy of cultured cells. Based on the assumption that minimizing injury due to O2 gradients will enhance the yield of functionally efficient cells, CDCs were cultured in 3% O2 and compared with cells maintained in ambient O2...
April 6, 2017: Molecular and Cellular Biochemistry
https://www.readbyqxmd.com/read/28382363/micropatterned-co-culture-of-cardiac-myocytes-on-fibrous-scaffolds-for-predictive-screening-of-drug-cardiotoxicities
#10
Yaowen Liu, Tian Xia, Jiaojun Wei, Qingjie Liu, Xiaohong Li
The spatial arrangement of cardiac myocytes (CMs) and other non-myocytes scaffolds, closely resembling native tissue, is essential to control the CM morphology and function for cardiac tissue regeneration. In the current study, micropatterned fibrous scaffolds were developed to establish a CM co-culture system with cardiac fibroblasts (CFs) and endothelial cells (ECs) as a potential in vitro drug screening model. To pursue a biomimetic approach to influence CM behaviors, strip, oval and wave-patterned mats were constructed by deposition of electrospun fibers on lithographic collectors, followed by precise stacking for cell co-cultures...
April 6, 2017: Nanoscale
https://www.readbyqxmd.com/read/28380047/response-of-the-human-myocardium-to-ischemic-injury-and-preconditioning-the-role-of-cardiac-and-comorbid-conditions-medical-treatment-and-basal-redox-status
#11
Kelly Casós, Gemma Ferrer-Curriu, Paula Soler-Ferrer, María L Pérez, Eduard Permanyer, Arnau Blasco-Lucas, Juan Manuel Gracia-Baena, Miguel A Castro, Carlos Sureda, Jordi Barquinero, Manuel Galiñanes
BACKGROUND: The diseased human myocardium is highly susceptible to ischemia/reoxygenation (I/R)-induced injury but its response to protective interventions such as ischemic preconditioning (IPreC) is unclear. Cardiac and other pre-existing clinical conditions as well as previous or ongoing medical treatment may influence the myocardial response to I/R injury and protection. This study investigated the effect of both on myocardial susceptibility to I/R-induced injury and the protective effects of IPreC...
2017: PloS One
https://www.readbyqxmd.com/read/28376365/bioacoustic-enabled-patterning-of-human-ipsc-derived-cardiomyocytes-into-3d-cardiac-tissue
#12
Vahid Serpooshan, Pu Chen, Haodi Wu, Soah Lee, Arun Sharma, Daniel A Hu, Sneha Venkatraman, Adarsh Venkataraman Ganesan, Osman Berk Usta, Martin Yarmush, Fan Yang, Joseph C Wu, Utkan Demirci, Sean M Wu
The creation of physiologically-relevant human cardiac tissue with defined cell structure and function is essential for a wide variety of therapeutic, diagnostic, and drug screening applications. Here we report a new scalable method using Faraday waves to enable rapid aggregation of human induced pluripotent stem cell-derived cardiomyocytes (hiPSC-CMs) into predefined 3D constructs. At packing densities that approximate native myocardium (10(8)-10(9) cells/ml), these hiPSC-CM-derived 3D tissues demonstrate significantly improved cell viability, metabolic activity, and intercellular connection when compared to constructs with random cell distribution...
March 28, 2017: Biomaterials
https://www.readbyqxmd.com/read/28376347/overview-of-avian-toxicity-studies-for-the-deepwater-horizon-natural-resource-damage-assessment
#13
S J Bursian, C R Alexander, D Cacela, F L Cunningham, K M Dean, B S Dorr, C K Ellis, C A Godard-Codding, C G Guglielmo, K C Hanson-Dorr, K E Harr, K A Healy, M J Hooper, K E Horak, J P Isanhart, L V Kennedy, J E Link, I Maggini, J K Moye, C R Perez, C A Pritsos, S A Shriner, K A Trust, P L Tuttle
The Oil Pollution Act of 1990 establishes liability for injuries to natural resources because of the release or threat of release of oil. Assessment of injury to natural resources resulting from an oil spill and development and implementation of a plan for the restoration, rehabilitation, replacement or acquisition of natural resources to compensate for those injuries is accomplished through the Natural Resource Damage Assessment (NRDA) process. The NRDA process began within a week of the Deepwater Horizon oil spill, which occurred on April 20, 2010...
April 1, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28367125/integrin-%C3%AE-1-increases-stem-cell-survival-and-cardiac-function-after-myocardial-infarction
#14
Lili Li, Qifan Guan, Shuling Dai, Wen Wei, Yao Zhang
Bone mesenchymal stem cells (BMSCs) transplantation is a promising therapeutic approach for myocardial infarction (MI), but its application is limited by poor viability of BMSCs. In this study, we aimed to improve the survival of BMSCs by lentivirus vector mediated overexpression of integrin β1. In vitro study showed that integrin β1 overexpression could facilitate the proliferation of BMSCs under oxygen glucose deprivation condition and regulated the expression of Caspase-3, Bax, Bcl-2, FAK, and ILK in BMSCs...
2017: Frontiers in Pharmacology
https://www.readbyqxmd.com/read/28364177/magnetic-resonance-imaging-for-characterizing-myocardial-diseases
#15
REVIEW
Maythem Saeed, Hui Liu, Chang-Hong Liang, Mark W Wilson
The National Institute of Health defined cardiomyopathy as diseases of the heart muscle. These myocardial diseases have different etiology, structure and treatment. This review highlights the key imaging features of different myocardial diseases. It provides information on myocardial structure/orientation, perfusion, function and viability in diseases related to cardiomyopathy. The standard cardiac magnetic resonance imaging (MRI) sequences can reveal insight on left ventricular (LV) mass, volumes and regional contractile function in all types of cardiomyopathy diseases...
March 31, 2017: International Journal of Cardiovascular Imaging
https://www.readbyqxmd.com/read/28361959/dinaciclib-potently-suppresses-mcl-1-and-selectively-induces-the-cell-death-in-human-ips-cells-without-affecting-the-viability-of-cardiac-tissue
#16
Khaled Alsayegh, Katsuhisa Matsuura, Hidekazu Sekine, Tatsuya Shimizu
Induced pluripotent stem (iPS) cells hold great potential for being a major source of cells for regenerative medicine. One major issue that hinders their advancement to clinic is the persistence of undifferentiated iPS cells in iPS-derived tissue. In this report, we show that the CDKs inhibitor, Dinaciclib, selectively eliminates iPS cells without affecting the viability of cardiac cells. We found that low nanomolar concentration of dinaciclib increased DNA damage and p53 protein levels in iPSCs. This was accompanied by negative regulation of the anti-apoptotic protein MCL-1...
March 31, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28353681/a-cardiac-early-warning-system-with-multi-channel-scg-and-ecg-monitoring-for-mobile-health
#17
Prasan Kumar Sahoo, Hiren Kumar Thakkar, Ming-Yih Lee
Use of information and communication technology such as smart phone, smart watch, smart glass and portable health monitoring devices for healthcare services has made Mobile Health (mHealth) an emerging research area. Coronary Heart Disease (CHD) is considered as a leading cause of death world wide and an increasing number of people die prematurely due to CHD. Under such circumstances, there is a growing demand for a reliable cardiac monitoring system to catch the intermittent abnormalities and detect critical cardiac behaviors which lead to sudden death...
March 29, 2017: Sensors
https://www.readbyqxmd.com/read/28351327/nigericin-decreases-the-viability-of-multidrug-resistant-cancer-cells-and-lung-tumorspheres-and-potentiates-the-effects-of-cardiac-glycosides
#18
Juan Sebastian Yakisich, Neelam Azad, Vivek Kaushik, George A O'Doherty, Anand Krishnan V Iyer
Multiple factors including tumor heterogeneity and intrinsic or acquired resistance have been associated with drug resistance in lung cancer. Increased stemness and the plasticity of cancer cells have been identified as important mechanisms of resistance; therefore, treatments targeting cancer cells independent of stemness phenotype would be much more effective in treating lung cancer. In this article, we have characterized the anticancer effects of the antibiotic Nigericin in cells displaying varying degrees of stemness and resistance to anticancer drugs, arising from (1) routine culture conditions, (2) prolonged periods of serum starvation...
March 2017: Tumour Biology: the Journal of the International Society for Oncodevelopmental Biology and Medicine
https://www.readbyqxmd.com/read/28351290/keratose-hydrogels-promote-vascular-smooth-muscle-differentiation-from-c-kit-positive-human-cardiac-stem-cells
#19
Benjamin T Ledford, Jamelle Simmons, Miao Chen, Huimin Fan, Catherine Barron, Zhongmin Liu, Mark Van Dyke, Jia-Qiang He
Stem cell-based therapies have demonstrated great potential for the treatment of cardiac diseases, <i>e.g.,</i> myocardial infarction; however, low cell viability, low retention/engraftment, and uncontrollable in vivo differentiation after transplantation are still major limitations, which lead low therapeutic efficiency. Biomaterials provide a promising solution to overcome these issues due to their biocompatibility, biodegradability, low/non-immunogenicity, and low/non-cytotoxicity. The present study aims to investigate the impacts of Keratose (KOS) hydrogel biomaterial on cellular viability, proliferation, and differentiation of c-kit<sup>+</sup> human cardiac stem cells (hCSCs)...
March 28, 2017: Stem Cells and Development
https://www.readbyqxmd.com/read/28348718/intramyocardial-injection-of-recombinant-adeno-associated-viral-vector-coexpressing-pr39-adrenomedullin-enhances-angiogenesis-and-reduces-apoptosis-in-a-rat-myocardial-infarction-model
#20
Rui An, Cong Xi, Jian Xu, Ying Liu, Shumiao Zhang, Yuemin Wang, Yuewen Hao, Lijun Sun
Cotransfer of angiogenic and antiapoptotic genes could be the basis of new gene therapy strategies for myocardial infarction. In this study, rAAV-PR39-ADM, coexpressing antimicrobial peptide (PR39) and adrenomedullin (ADM), was designed with the mediation of recombinant adeno-associated virus. In vitro, CRL-1730 cells were divided into four groups, namely, the sham group, the AAV-null group, the NS (normal saline) group, and the PR39-ADM group. Immunocytochemistry analysis, CCK-8 assays, Matrigel assays, and apoptotic analysis were performed; in vivo, myocardial infarction model was established through ligation of the left coronary artery on rats, and treatment groups corresponded to those used in vitro...
2017: Oxidative Medicine and Cellular Longevity
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