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Home > Medicine & Health Science textbooks > Pre-clinical medicine: basic sciences > Physiology > Engineered Anisotropy of Human Embryonic Stem Cell-Derived Ventricular Cardiomyocytes by Physical Alignment for Enhanced Safety and Accuracy of Arrhythmogenicity Prediction
Engineered Anisotropy of Human Embryonic Stem Cell-Derived Ventricular Cardiomyocytes by Physical Alignment for Enhanced Safety and Accuracy of Arrhythmogenicity Prediction

Engineered Anisotropy of Human Embryonic Stem Cell-Derived Ventricular Cardiomyocytes by Physical Alignment for Enhanced Safety and Accuracy of Arrhythmogenicity Prediction


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About the Book

This dissertation, "Engineered Anisotropy of Human Embryonic Stem Cell-derived Ventricular Cardiomyocytes by Physical Alignment for Enhanced Safety and Accuracy of Arrhythmogenicity Prediction" by Jiaxian, Wang, 王嘉顯, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: Human (h) pluripotent stem cells such as embryonic stem cells (ESC) can be directed into the cardiac lineage, representing a potential unlimited source of cardiomyocytes (CMs) for myocardial repair. However, their arrhythmogenicity has not been thoroughly assessed. Indeed, native ventricular (V) CMs are aligned in a highly organized fashion such that electrical conduction is anisotropic for coordinated contractions. However, hESC-derived CM (hESC-CM) clusters are randomly organized. Using shrink-film microgroove technology, hESC-VCMs derived using a specification protocol were seeded on micro-fabricated polydimethylsiloxane (PDMS) consisting of multi-scale (nano to micro) grooves to induce cell alignment, followed by high-resolution optical mapping recordings. Aligned preparations consistently showed distinct longitudinal (L) and transverse (T) conduction velocities (CV), resulting in significantly higher anisotropy ratios (AR=LCV/TCV) compared to unaligned controls (1.8-2.0 vs. 1.0). AR depended on the topography but cellular properties such as action potential duration (APD) were not altered by alignment. Importantly, the total incidence of spontaneous and inducible arrhythmias, in the form of functional reentrant spiral waves, during steady-state pacing and programmed electrical stimulations (S1-S2), respectively, was significantly reduced from 57% in controls to 17-23% in aligned preparations. In controls, isoproterenol application promoted reentrant arrhythmias, which was inhibited by cell alignment. Multi-scale topography enables the physical alignment of hESC-VCMs, thereby reproducing functional anisotropy. Aligned anisotropic hESC-VCMs are less susceptible to arrhythmias, and may lead to future transplantable prototypes with improved efficacy and safety as well as more accurate models for arrhythmogenicity screening. Subjects: Stem cells Heart cells


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Product Details
  • ISBN-13: 9781361382516
  • Publisher: Open Dissertation Press
  • Publisher Imprint: Open Dissertation Press
  • Height: 279 mm
  • No of Pages: 168
  • Weight: 685 gr
  • ISBN-10: 1361382511
  • Publisher Date: 27 Jan 2017
  • Binding: Hardback
  • Language: English
  • Spine Width: 11 mm
  • Width: 216 mm


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Engineered Anisotropy of Human Embryonic Stem Cell-Derived Ventricular Cardiomyocytes by Physical Alignment for Enhanced Safety and Accuracy of Arrhythmogenicity Prediction
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Engineered Anisotropy of Human Embryonic Stem Cell-Derived Ventricular Cardiomyocytes by Physical Alignment for Enhanced Safety and Accuracy of Arrhythmogenicity Prediction
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