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Engineered myocardium

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https://www.readbyqxmd.com/read/29925535/human-induced-pluripotent-stem-cell-derived-engineered-heart-tissue-as-a-sensitive-test-system-for-qt-prolongation-and-arrhythmic-triggers
#1
Marc D Lemoine, Tobias Krause, Jussi T Koivumäki, Maksymilian Prondzynski, Mirja L Schulze, Evaldas Girdauskas, Stephan Willems, Arne Hansen, Thomas Eschenhagen, Torsten Christ
BACKGROUND: Cardiac repolarization abnormalities in drug-induced and genetic long-QT syndrome may lead to afterdepolarizations and life-threatening ventricular arrhythmias. Human induced pluripotent stem cell-derived cardiomyocytes (hiPSC-CMs) should help to overcome the limitations of animal models based on species differences in repolarization reserve. Here, we compared head-to-head the contribution of I Ks (long QT1) and I Kr (long QT2) on action potentials (APs) in human left ventricular (LV) tissue and hiPSC-CM-derived engineered heart tissue (EHT)...
July 2018: Circulation. Arrhythmia and Electrophysiology
https://www.readbyqxmd.com/read/29906229/engineering-cardiac-microphysiological-systems-to-model-pathological-extracellular-matrix-remodeling
#2
Nethika Ruvini Ariyasinghe, Davi Marco Lyra-Leite, Megan L McCain
Many cardiovascular diseases are associated with pathological remodeling of the extracellular matrix (ECM) in the myocardium. ECM remodeling is a complex, multi-factorial process that often contributes to declines in myocardial function and progression towards heart failure. However, the direct effects of the many forms of ECM remodeling on myocardial cell and tissue function remain elusive, in part because conventional model systems used to investigate these relationships lack robust experimental control over the ECM...
June 15, 2018: American Journal of Physiology. Heart and Circulatory Physiology
https://www.readbyqxmd.com/read/29901284/application-of-tissue-engineered-pericardial-patch-in-rat-models-of-myocardial-infarction
#3
Maryam Kameli, Reza Khorramirouz, Sahar Eftekharzadeh, Kiarad Fendereski, Seyedeh Sima Daryabari, Seyed Mohammad Tavangar, Abdol-Mohammad Kajbafzadeh
INTRODUCTION: Myocardial infarction (MI) is a major cause of mortality and morbidity in industrialized societies. Myocardial tissue engineering is an alternative and promising approach for substituting injured myocardium through development and seeding of appropriate scaffolds. In this study, we investigated the efficacy of using an acellular pericardium to deliver autologous mesenchymal stem cells (MSCs) to the infarcted site for regeneration of the myocardium. MATERIALS AND METHODS: MI was induced in two groups of rats; G1 or MI group, and G2 or patch-implanted group...
June 14, 2018: Journal of Biomedical Materials Research. Part A
https://www.readbyqxmd.com/read/29859168/stem-cell-derived-cardiomyocytes-grow-up-start-young-and-train-harder
#4
Joshua T Maxwell, Chunhui Xu
Engineering cardiac tissue that accurately recapitulates adult myocardium is critical for advancing disease modeling, drug screening, and regenerative medicine. Ronaldson-Bouchard et al. report a new strategy for generating cardiac tissues from stem-cell-derived cardiomyocytes that reach a maturation level closer to human adult cardiac structure and function.
June 1, 2018: Cell Stem Cell
https://www.readbyqxmd.com/read/29744562/mussel-inspired-3d-fiber-scaffolds-for-heart-on-a-chip-toxicity-studies-of-engineered-nanomaterials
#5
Seungkuk Ahn, Herdeline Ann M Ardoña, Johan U Lind, Feyisayo Eweje, Sean L Kim, Grant M Gonzalez, Qihan Liu, John F Zimmerman, Georgios Pyrgiotakis, Zhenyuan Zhang, Juan Beltran-Huarac, Paul Carpinone, Brij M Moudgil, Philip Demokritou, Kevin Kit Parker
Due to the unique physicochemical properties exhibited by materials with nanoscale dimensions, there is currently a continuous increase in the number of engineered nanomaterials (ENMs) used in consumer goods. However, several reports associate ENM exposure to negative health outcomes such as cardiovascular diseases. Therefore, understanding the pathological consequences of ENM exposure represents an important challenge, requiring model systems that can provide mechanistic insights across different levels of ENM-based toxicity...
May 10, 2018: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/29715271/directed-fusion-of-cardiac-spheroids-into-larger-heterocellular-microtissues-enables-investigation-of-cardiac-action-potential-propagation-via-cardiac-fibroblasts
#6
Tae Yun Kim, Celinda M Kofron, Michelle E King, Alexander R Markes, Amenawon O Okundaye, Zhilin Qu, Ulrike Mende, Bum-Rak Choi
Multicellular spheroids generated through cellular self-assembly provide cytoarchitectural complexities of native tissue including three-dimensionality, extensive cell-cell contacts, and appropriate cell-extracellular matrix interactions. They are increasingly suggested as building blocks for larger engineered tissues to achieve shapes, organization, heterogeneity, and other biomimetic complexities. Application of these tissue culture platforms is of particular importance in cardiac research as the myocardium is comprised of distinct but intermingled cell types...
2018: PloS One
https://www.readbyqxmd.com/read/29712965/head-to-head-comparison-of-two-engineered-cardiac-grafts-for-myocardial-repair-from-scaffold-characterization-to-pre-clinical-testing
#7
Isaac Perea-Gil, Carolina Gálvez-Montón, Cristina Prat-Vidal, Ignasi Jorba, Cristina Segú-Vergés, Santiago Roura, Carolina Soler-Botija, Oriol Iborra-Egea, Elena Revuelta-López, Marco A Fernández, Ramon Farré, Daniel Navajas, Antoni Bayes-Genis
Cardiac tissue engineering, which combines cells and supportive scaffolds, is an emerging treatment for restoring cardiac function after myocardial infarction (MI), although, the optimal construct remains a challenge. We developed two engineered cardiac grafts, based on decellularized scaffolds from myocardial and pericardial tissues and repopulated them with adipose tissue mesenchymal stem cells (ATMSCs). The structure, macromechanical and micromechanical scaffold properties were preserved upon the decellularization and recellularization processes, except for recellularized myocardium micromechanics that was ∼2-fold stiffer than native tissue and decellularized scaffolds...
April 30, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29687502/paintable-and-rapidly-bondable-conductive-hydrogels-as-therapeutic-cardiac-patches
#8
Shuang Liang, Yinyu Zhang, Hongbo Wang, Ziyang Xu, Jingrui Chen, Rui Bao, Baoyu Tan, Yuanlu Cui, Guanwei Fan, Wenxin Wang, Wei Wang, Wenguang Liu
In recent years, cardiac patches have been developed for the treatment of myocardial infarction. However, the fixation approaches onto the tissue through suture or phototriggered reaction inevitably cause new tissue damage. Herein, a paintable hydrogel is constructed based on Fe3+ -triggered simultaneous polymerization of covalently linked pyrrole and dopamine in the hyperbranched chains where the in situ formed conductive polypyrrole also uniquely serves to crosslink network. This conductive and adhesive hydrogel can be conveniently painted as a patch onto the heart surface without adverse liquid leakage...
June 2018: Advanced Materials
https://www.readbyqxmd.com/read/29625872/construction-of-scaffolds-composed-of-acellular-cardiac-extracellular-matrix-for-myocardial-tissue-engineering
#9
Kamyar Esmaeili Pourfarhangi, Shohreh Mashayekhan, Sasan Ghanbari Asl, Zahra Hajebrahimi
High rates of mortality and morbidity stemming from cardiovascular diseases unveil extreme limitations in current therapies despite enormous advances in medical and pharmaceutical sciences. Following myocardial infarction (MI), parts of myocardium undergo irreversible remodeling and is substituted by a scar tissue which eventually leads to heart failure (HF). To address this issue, cardiac patches have been utilized to initiate myocardial regeneration. In this study, a porous cardiac patch is fabricated using a mixture of decellularized myocardium extracellular matrix (ECM) and chitosan (CS)...
May 2018: Biologicals: Journal of the International Association of Biological Standardization
https://www.readbyqxmd.com/read/29406721/gold-nanorod-based-engineered-cardiac-patch-for-suture-free-engraftment-by-near-ir
#10
Maayan Malki, Sharon Fleischer, Assaf Shapira, Tal Dvir
Although cardiac patches hold a promise for repairing the infarcted heart, their integration with the myocardium by sutures may cause further damage to the diseased organ. To address this issue, we developed facile and safe, suture-free technology for the attachment of engineered tissues to organs. Here, nanocomposite scaffolds comprised of albumin electrospun fibers and gold nanorods (AuNRs) were developed. Cardiac cells were seeded within the scaffolds and assembled into a functioning patch. The engineered tissue was then positioned on the myocardium and irradiated with a near IR laser (808 nm)...
February 8, 2018: Nano Letters
https://www.readbyqxmd.com/read/29397554/the-role-of-intralipid-emulsion-in-the-rat-model-of-digoxin-intoxication
#11
Cansu Arslan Turan, Tuba Cimilli Ozturk, Ebru Unal Akoglu, Rohat Ak, Kemal Aygun, Ali Sahiner, Engin Sumer, Adnan Somay, Ozge Ecmel Onur
Although the mechanism of action is not well known, intravenous lipid emulsion (ILE) has been shown to be effective in the treatment of lipophilic drug intoxications. It is thought that, ILE probably separates the lipophilic drugs from target tissue by creating a lipid-rich compartment in the plasma. The second theory is that ILE provides energy to myocardium with high-dose free fatty acids activating the voltage-gated calcium channels in the myocytes. In this study, effects of ILE treatment on digoxin overdose were searched in an animal model in terms of cardiac side effects and survival...
February 3, 2018: Cardiovascular Toxicology
https://www.readbyqxmd.com/read/29309993/engineered-cardiac-tissue-patch-maintains-structural-and-electrical-properties-after-epicardial-implantation
#12
Christopher P Jackman, Asvin M Ganapathi, Huda Asfour, Ying Qian, Brian W Allen, Yanzhen Li, Nenad Bursac
Functional cardiac tissue engineering holds promise as a candidate therapy for myocardial infarction and heart failure. Generation of "strong-contracting and fast-conducting" cardiac tissue patches capable of electromechanical coupling with host myocardium could allow efficient improvement of heart function without increased arrhythmogenic risks. Towards that goal, we engineered highly functional 1 cm × 1 cm cardiac tissue patches made of neonatal rat ventricular cells which after 2 weeks of culture exhibited force of contraction of 18...
March 2018: Biomaterials
https://www.readbyqxmd.com/read/29276147/evaluation-of-cobalt-and-chromium-levels-following-implantation-of-cobalt-chromium-coronary-stents-a-pilot-study
#13
Pietro Di Santo, Pouya Motazedian, Richard G Jung, Trevor Simard, F Daniel Ramirez, Aun-Yeong Chong, Christopher Glover, Benjamin Hibbert, Girish Dwivedi
BACKGROUND: Large increases in myocardial trace elements may adversely affect metabolism and become detrimental to cardiac function. Percutaneous coronary intervention (PCI) allows for the revascularisation of obstructive coronary artery disease using drug-eluting stents. These stents are comprised of a metallic stent backbone covered in an engineered polymer which delivers a drug over a prescribed period to the vessel wall. Given the potential implications of trace metal accumulation within the myocardium, our goal is to determine if metallic coronary stents are able to cause detectable elevations in serum cobalt and/or chromium levels...
June 2018: Heart, Lung & Circulation
https://www.readbyqxmd.com/read/29233823/large-cardiac-muscle-patches-engineered-from-human-induced-pluripotent-stem-cell-derived-cardiac-cells-improve-recovery-from-myocardial-infarction-in-swine
#14
Ling Gao, Zachery R Gregorich, Wuqiang Zhu, Saidulu Mattapally, Yasin Oduk, Xi Lou, Ramaswamy Kannappan, Anton V Borovjagin, Gregory P Walcott, Andrew E Pollard, Vladimir G Fast, Xinyang Hu, Steven G Lloyd, Ying Ge, Jianyi Zhang
BACKGROUND: Here, we generated human cardiac muscle patches (hCMPs) of clinically relevant dimensions (4 cm × 2 cm × 1.25 mm) by suspending cardiomyocytes, smooth muscle cells, and endothelial cells that had been differentiated from human induced-pluripotent stem cells in a fibrin scaffold and then culturing the construct on a dynamic (rocking) platform. METHODS: In vitro assessments of hCMPs suggest maturation in response to dynamic culture stimulation. In vivo assessments were conducted in a porcine model of myocardial infarction (MI)...
April 17, 2018: Circulation
https://www.readbyqxmd.com/read/29184059/cardiopatch-platform-enables-maturation-and-scale-up-of-human-pluripotent-stem-cell-derived-engineered-heart-tissues
#15
Ilya Y Shadrin, Brian W Allen, Ying Qian, Christopher P Jackman, Aaron L Carlson, Mark E Juhas, Nenad Bursac
Despite increased use of human induced pluripotent stem cell-derived cardiomyocytes (hiPSC-CMs) for drug development and disease modeling studies, methods to generate large, functional heart tissues for human therapy are lacking. Here we present a "Cardiopatch" platform for 3D culture and maturation of hiPSC-CMs that after 5 weeks of differentiation show robust electromechanical coupling, consistent H-zones, I-bands, and evidence for T-tubules and M-bands. Cardiopatch maturation markers and functional output increase during culture, approaching values of adult myocardium...
November 28, 2017: Nature Communications
https://www.readbyqxmd.com/read/29129433/nanoparticulate-specific-effects-of-silver-on-teleost-cardiac-contractility
#16
Neal Ingraham Callaghan, Kenneth Javier Williams, J Craig Bennett, Tyson James MacCormack
Silver nanoparticles (nAg), due to their biocidal properties, are common in medical applications and are used in more consumer products than any other engineered nanomaterial. This growing abundance, combined with their ability to translocate across the epithelium and bioaccumulate, suggests that internalized nAg may present a risk of toxicity to many organisms in the future. However, little experimentation has been devoted to cardiac responses to acute nAg exposure, even though nAg is known to disrupt ion channels even when ionic Ag+ does not...
June 2018: Environmental Pollution
https://www.readbyqxmd.com/read/29107590/human-pluripotent-stem-cell-derived-cardiac-tissue-like-constructs-for-repairing-the-infarcted-myocardium
#17
Junjun Li, Itsunari Minami, Motoko Shiozaki, Leqian Yu, Shin Yajima, Shigeru Miyagawa, Yuji Shiba, Nobuhiro Morone, Satsuki Fukushima, Momoko Yoshioka, Sisi Li, Jing Qiao, Xin Li, Lin Wang, Hidetoshi Kotera, Norio Nakatsuji, Yoshiki Sawa, Yong Chen, Li Liu
High-purity cardiomyocytes (CMs) derived from human induced pluripotent stem cells (hiPSCs) are promising for drug development and myocardial regeneration. However, most hiPSC-derived CMs morphologically and functionally resemble immature rather than adult CMs, which could hamper their application. Here, we obtained high-quality cardiac tissue-like constructs (CTLCs) by cultivating hiPSC-CMs on low-thickness aligned nanofibers made of biodegradable poly(D,L-lactic-co-glycolic acid) polymer. We show that multilayered and elongated CMs could be organized at high density along aligned nanofibers in a simple one-step seeding process, resulting in upregulated cardiac biomarkers and enhanced cardiac functions...
November 14, 2017: Stem Cell Reports
https://www.readbyqxmd.com/read/29076427/engineered-nanoparticles-their-properties-and-putative-applications-for-therapeutic-approaches-utilizing-stem-cells-for-the-repair-of-atherosclerotic-disease
#18
Dimitry A Chistiakov, Alexandra A Melnichenko, Alexander N Orekhov, Yuri V Bobryshev
BACKGROUND: Stem cell therapy was established as a promising approach for regenerative medicine applications such as cardiac repair. However, current stem cell-based therapeutic strategies have serious challenges such as low retention and viability of transplanted stem cells in the injured myocardium. This significantly limits efficiency of stem cell therapy. In addition, poor knowledge about the fate and survival of stem cells after transplantation represents a major reason of conflicting results from recent clinical studies...
October 27, 2017: Current Drug Targets
https://www.readbyqxmd.com/read/29076304/review-of-the-emerging-role-of-optical-polarimetry-in-characterization-of-pathological-myocardium
#19
Iftikhar Ahmad
Myocardial infarction (MI), a cause of significant morbidity and mortality, is typically followed by microstructural alterations where the necrotic myocardium is steadily replaced with a collagen scar. Engineered remodeling of the fibrotic scar via stem cell regeneration has been shown to improve/restore the myocardium function after MI. Nevertheless, the heterogeneous nature of the scar patch may impair the myocardial electrical integrity, leading to the formation of arrhythmogenesis. Radiofrequency ablation (RFA) offers an effective treatment for focal arrhythmias where local heating generated via electric current at specific spots in the myocardium ablate the arrhythmogenic foci...
October 2017: Journal of Biomedical Optics
https://www.readbyqxmd.com/read/29052369/protein-polysaccharide-based-scaffolds-mimicking-native-extracellular-matrix-for-cardiac-tissue-engineering-applications
#20
Elisabetta Rosellini, Yu Shrike Zhang, Bianca Migliori, Niccoletta Barbani, Luigi Lazzeri, Su Ryon Shin, Mehmet Remzi Dokmeci, Maria Grazia Cascone
Tissue engineering has emerged as a viable approach to treat disease or repair damage in tissues and organs. One of the key elements for the success of tissue engineering is the use of a scaffold serving as artificial extracellular matrix (ECM). The ECM hosts the cells and improves their survival, proliferation, and differentiation, enabling the formation of new tissue. Here, we propose the development of a class of protein/polysaccharide-based porous scaffolds for use as ECM substitutes in cardiac tissue engineering...
March 2018: Journal of Biomedical Materials Research. Part A
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