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van Dover G, Javor J, Ewoldt JK, Zhernenkov M, Wąsik P, Freychet G, Lee J, Brown D, Chen CS, Bishop DJ. Structural maturation of myofilaments in engineered 3D cardiac microtissues characterized using small angle x-ray scattering. Phys Biol 2024; 21:036001. [PMID: 38452380 DOI: 10.1088/1478-3975/ad310e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2023] [Accepted: 03/07/2024] [Indexed: 03/09/2024]
Abstract
Understanding the structural and functional development of human-induced pluripotent stem-cell-derived cardiomyocytes (hiPSC-CMs) is essential to engineering cardiac tissue that enables pharmaceutical testing, modeling diseases, and designing therapies. Here we use a method not commonly applied to biological materials, small angle x-ray scattering, to characterize the structural development of hiPSC-CMs within three-dimensional engineered tissues during their preliminary stages of maturation. An x-ray scattering experimental method enables the reliable characterization of the cardiomyocyte myofilament spacing with maturation time. The myofilament lattice spacing monotonically decreases as the tissue matures from its initial post-seeding state over the span of 10 days. Visualization of the spacing at a grid of positions in the tissue provides an approach to characterizing the maturation and organization of cardiomyocyte myofilaments and has the potential to help elucidate mechanisms of pathophysiology, and disease progression, thereby stimulating new biological hypotheses in stem cell engineering.
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Affiliation(s)
| | - Josh Javor
- Boston University, Boston, MA 02215, United States of America
| | | | - Mikhail Zhernenkov
- Brookhaven National Laboratory, Upton, NY 11973, United States of America
| | - Patryk Wąsik
- Brookhaven National Laboratory, Upton, NY 11973, United States of America
| | - Guillaume Freychet
- Brookhaven National Laboratory, Upton, NY 11973, United States of America
| | - Josh Lee
- Boston University, Boston, MA 02215, United States of America
| | - Dana Brown
- Fort Valley State University, Fort Valley, GA 31030, United States of America
| | | | - David J Bishop
- Boston University, Boston, MA 02215, United States of America
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Grimes KM, Maillet M, Swoboda CO, Bowers SLK, Millay DP, Molkentin JD. MEK1-ERK1/2 signaling regulates the cardiomyocyte non-sarcomeric actin cytoskeletal network. Am J Physiol Heart Circ Physiol 2024; 326:H180-H189. [PMID: 37999644 DOI: 10.1152/ajpheart.00612.2023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/29/2023] [Revised: 11/09/2023] [Accepted: 11/15/2023] [Indexed: 11/25/2023]
Abstract
During select pathological conditions, the heart can hypertrophy and remodel in either a dilated or concentric ventricular geometry, which is associated with lengthening or widening of cardiomyocytes, respectively. The mitogen-activated protein kinase kinase 1 (MEK1) and extracellular signal-related kinase 1 and 2 (ERK1/2) pathway has been implicated in these differential types of growth such that cardiac overexpression of activated MEK1 causes profound concentric hypertrophy and cardiomyocyte thickening, while genetic ablation of the genes encoding ERK1/2 in the mouse heart causes dilation and cardiomyocyte lengthening. However, the mechanisms by which this kinase signaling pathway controls cardiomyocyte directional growth as well as its downstream effectors are poorly understood. To investigate this, we conducted an unbiased phosphoproteomic screen in cultured neonatal rat ventricular myocytes treated with an activated MEK1 adenovirus, the MEK1 inhibitor U0126, or an eGFP adenovirus control. Bioinformatic analysis identified cytoskeletal-related proteins as the largest subset of differentially phosphorylated proteins. Phos-tag and traditional Western blotting were performed to confirm that many cytoskeletal proteins displayed changes in phosphorylation with manipulations in MEK1-ERK1/2 signaling. From this, we hypothesized that the actin cytoskeleton would be changed in vivo in the mouse heart. Indeed, we found that activated MEK1 transgenic mice and gene-deleted mice lacking ERK1/2 protein had enhanced non-sarcomeric actin expression in cardiomyocytes compared with wild-type control hearts. Consistent with these results, cytoplasmic β- and γ-actin were increased at the subcortical intracellular regions of adult cardiomyocytes. Together, these data suggest that MEK1-ERK1/2 signaling influences the non-sarcomeric cytoskeletal actin network, which may be important for facilitating the growth of cardiomyocytes in length and/or width.NEW & NOTEWORTHY Here, we performed an unbiased analysis of the total phosphoproteome downstream of MEK1-ERK1/2 kinase signaling in cardiomyocytes. Pathway analysis suggested that proteins of the non-sarcomeric cytoskeleton were the most differentially affected. We showed that cytoplasmic β-actin and γ-actin isoforms, regulated by MEK1-ERK1/2, are localized to the subcortical space at both lateral membranes and intercalated discs of adult cardiomyocytes suggesting how MEK1-ERK1/2 signaling might underlie directional growth of adult cardiomyocytes.
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Affiliation(s)
- Kelly M Grimes
- Department of Pediatrics, Cincinnati Children's Hospital Medical Center, University of Cincinnati, Cincinnati, Ohio, United States
| | - Marjorie Maillet
- Department of Pediatrics, Cincinnati Children's Hospital Medical Center, University of Cincinnati, Cincinnati, Ohio, United States
| | - Casey O Swoboda
- Department of Pediatrics, Cincinnati Children's Hospital Medical Center, University of Cincinnati, Cincinnati, Ohio, United States
| | - Stephanie L K Bowers
- Department of Pediatrics, Cincinnati Children's Hospital Medical Center, University of Cincinnati, Cincinnati, Ohio, United States
| | - Doug P Millay
- Department of Pediatrics, Cincinnati Children's Hospital Medical Center, University of Cincinnati, Cincinnati, Ohio, United States
| | - Jeffery D Molkentin
- Department of Pediatrics, Cincinnati Children's Hospital Medical Center, University of Cincinnati, Cincinnati, Ohio, United States
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Hashida A, Nakazato T, Uemura T, Liu L, Miyagawa S, Sawa Y, Kino-oka M. Effect of morphological change on the maturation of human induced pluripotent stem cell-derived cardiac tissue in rotating flow culture. Regen Ther 2023; 24:479-488. [PMID: 37767182 PMCID: PMC10520276 DOI: 10.1016/j.reth.2023.09.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2023] [Revised: 08/06/2023] [Accepted: 09/04/2023] [Indexed: 09/29/2023] Open
Abstract
Introduction Understanding the critical factors for the maturation of human induced pluripotent stem cell (hiPSC)-derived cardiac tissue is important for further development of culture techniques. Rotating flow culture, where the tissues float in the culture medium by balancing its gravitational settling and the medium flow generated in rotating disk-shaped culture vessels, is one of culture systems used for tissue engineering. It has previously been demonstrated that rotating flow culture leads to the formation of matured cardiac tissue with higher levels of function and structure than the other culture systems. However, the detailed mechanisms underlying the maturation of cardiac tissue remain unclear. This study investigated the maturation process of hiPSC-derived cardiac tissue in rotating flow culture with a focus on morphological changes in the tissue, which is a trigger for maturation. Methods The cardiac tissue, which consisted of cardiomyocytes derived from hiPSCs, was cultured on the 3D scaffold of poly (lactic-co-glycolic) acid (PLGA)-aligned nanofibers, in rotating flow culture for 5 days. During the culture, the time profile of projected area of tissue and formation of maturation marker proteins (β-myosin heavy chain and Connexin-43), tissue structure, and formation of nuclear lamina proteins (Lamin A/C) were compared with that in static suspension culture. Results The ratio of the projected area of tissue significantly decreased from Day 0 to Day 3 due to tissue shrinkage. In contrast, Western blot analysis revealed that maturation protein markers of cardiomyocytes significantly increased after Day 3. In addition, in rotating flow culture, flat-shaped nuclei and fiber-like cytoskeletal structures were distributed in the surface region of tissue where medium flow was continuously applied. Moreover, Lamin A/C, which are generally formed in differentiated cells owing to mechanical force across the cytoskeleton and critically affect the maturation of cardiomyocytes, were significantly formed in the tissue of rotating flow culture. Conclusions In this study, we found that spatial heterogeneity of tissue structure and tissue shrinkage occurred in rotating flow culture, which was not observed in static suspension culture. Moreover, from the quantitative analysis, it was also suggested that tissue shrinkage in rotating flow culture contributed its following tissue maturation. These findings showed one of the important characteristics of rotating flow culture which was not revealed in previous studies.
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Affiliation(s)
- Akihiro Hashida
- Department of Biotechnology, Graduate School of Engineering, Osaka University, 2-1, Yamadaoka, Suita, Osaka, 565-0871, Japan
| | - Taro Nakazato
- Department of Surgery, Division of Cardiovascular Surgery, Graduate School of Medicine, Osaka University, 2-15, Yamadaoka, Suita, Osaka, 565-0871, Japan
| | - Toshimasa Uemura
- Department of Precise and Science Technology, Graduate School of Engineering, Osaka University, 2-1, Yamadaoka, Suita, Osaka, 565-0871, Japan
- Cell Culture Marketing & Research Center, JTEC Corporation, 2-1, Yamadaoka, Suita, Osaka, 565-0871, Japan
| | - Li Liu
- Department of Surgery, Division of Cardiovascular Surgery, Graduate School of Medicine, Osaka University, 2-15, Yamadaoka, Suita, Osaka, 565-0871, Japan
| | - Shigeru Miyagawa
- Department of Surgery, Division of Cardiovascular Surgery, Graduate School of Medicine, Osaka University, 2-15, Yamadaoka, Suita, Osaka, 565-0871, Japan
| | - Yoshiki Sawa
- Division of Health and Sciences, Graduate School of Medicine, Osaka University, 2-15, Yamadaoka, Suita, Osaka, 565-0871, Japan
| | - Masahiro Kino-oka
- Department of Biotechnology, Graduate School of Engineering, Osaka University, 2-1, Yamadaoka, Suita, Osaka, 565-0871, Japan
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Junho CVC, Frisch J, Soppert J, Wollenhaupt J, Noels H. Cardiomyopathy in chronic kidney disease: clinical features, biomarkers and the contribution of murine models in understanding pathophysiology. Clin Kidney J 2023; 16:1786-1803. [PMID: 37915935 PMCID: PMC10616472 DOI: 10.1093/ckj/sfad085] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2022] [Indexed: 11/03/2023] Open
Abstract
The cardiorenal syndrome (CRS) is described as a multi-organ disease encompassing bidirectionally heart and kidney. In CRS type 4, chronic kidney disease (CKD) leads to cardiac injury. Different pathological mechanisms have been identified to contribute to the establishment of CKD-induced cardiomyopathy, including a neurohormonal dysregulation, disturbances in the mineral metabolism and an accumulation of uremic toxins, playing an important role in the development of inflammation and oxidative stress. Combined, this leads to cardiac dysfunction and cardiac pathophysiological and morphological changes, like left ventricular hypertrophy, myocardial fibrosis and cardiac electrical changes. Given that around 80% of dialysis patients suffer from uremic cardiomyopathy, the study of cardiac outcomes in CKD is clinically highly relevant. The present review summarizes clinical features and biomarkers of CKD-induced cardiomyopathy and discusses underlying pathophysiological mechanisms recently uncovered in the literature. It discloses how animal models have contributed to the understanding of pathological kidney-heart crosstalk, but also provides insights into the variability in observed effects of CKD on the heart in different CKD mouse models, covering both "single hit" as well as "multifactorial hit" models. Overall, this review aims to support research progress in the field of CKD-induced cardiomyopathy.
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Affiliation(s)
| | - Janina Frisch
- Department of Biophysics, Center for Integrative Physiology and Molecular Medicine, Medical Faculty, Saarland University, Center for Human and Molecular Biology, Homburg/Saar, Germany
| | - Josefin Soppert
- Institute for Molecular Cardiovascular Research (IMCAR), University Hospital RWTH Aachen, Aachen, Germany
- Department of Anesthesiology, University Hospital RWTH Aachen, Aachen, Germany
| | - Julia Wollenhaupt
- Institute for Molecular Cardiovascular Research (IMCAR), University Hospital RWTH Aachen, Aachen, Germany
| | - Heidi Noels
- Institute for Molecular Cardiovascular Research (IMCAR), University Hospital RWTH Aachen, Aachen, Germany
- Department of Biochemistry, Cardiovascular Research Institute Maastricht (CARIM), Maastricht University, Maastricht, the Netherlands
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Rodriguez Garcia M, Schmeckpeper J, Landim-Vieira M, Coscarella IL, Fang X, Ma W, Spran PA, Yuan S, Qi L, Kahmini AR, Shoemaker MB, Atkinson JB, Kekenes-Huskey PM, Irving TC, Chase PB, Knollmann BC, Pinto JR. Disruption of Z-Disc Function Promotes Mechanical Dysfunction in Human Myocardium: Evidence for a Dual Myofilament Modulatory Role by Alpha-Actinin 2. Int J Mol Sci 2023; 24:14572. [PMID: 37834023 PMCID: PMC10572656 DOI: 10.3390/ijms241914572] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2023] [Revised: 09/19/2023] [Accepted: 09/20/2023] [Indexed: 10/15/2023] Open
Abstract
The ACTN2 gene encodes α-actinin 2, located in the Z-disc of the sarcomeres in striated muscle. In this study, we sought to investigate the effects of an ACTN2 missense variant of unknown significance (p.A868T) on cardiac muscle structure and function. Left ventricular free wall samples were obtained at the time of cardiac transplantation from a heart failure patient with the ACTN2 A868T heterozygous variant. This variant is in the EF 3-4 domain known to interact with titin and α-actinin. At the ultrastructural level, ACTN2 A868T cardiac samples presented small structural changes in cardiomyocytes when compared to healthy donor samples. However, contractile mechanics of permeabilized ACTN2 A868T variant cardiac tissue displayed higher myofilament Ca2+ sensitivity of isometric force, reduced sinusoidal stiffness, and faster rates of tension redevelopment at all Ca2+ levels. Small-angle X-ray diffraction indicated increased separation between thick and thin filaments, possibly contributing to changes in muscle kinetics. Molecular dynamics simulations indicated that while the mutation does not significantly impact the structure of α-actinin on its own, it likely alters the conformation associated with titin binding. Our results can be explained by two Z-disc mediated communication pathways: one pathway that involves α-actinin's interaction with actin, affecting thin filament regulation, and the other pathway that involves α-actinin's interaction with titin, affecting thick filament activation. This work establishes the role of α-actinin 2 in modulating cross-bridge kinetics and force development in the human myocardium as well as how it can be involved in the development of cardiac disease.
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Affiliation(s)
| | - Jeffrey Schmeckpeper
- Department of Medicine, Division of Cardiovascular Medicine, Vanderbilt University Medical Center, Nashville, TN 37232, USA
| | | | | | - Xuan Fang
- Department of Cell & Molecular Physiology, Loyola University, Chicago, IL 60660, USA
| | - Weikang Ma
- BioCAT, Department of Biological Sciences, Illinois Institute of Technology, Chicago, IL 60616, USA
| | - Payton A. Spran
- Department of Biological Science, Florida State University, Tallahassee, FL 32306, USA
| | - Shengyao Yuan
- BioCAT, Department of Biological Sciences, Illinois Institute of Technology, Chicago, IL 60616, USA
| | - Lin Qi
- BioCAT, Department of Biological Sciences, Illinois Institute of Technology, Chicago, IL 60616, USA
| | - Aida Rahimi Kahmini
- Department of Nutrition and Integrative Physiology, Florida State University, Tallahassee, FL 32306, USA;
| | - M. Benjamin Shoemaker
- Department of Medicine, Division of Cardiovascular Medicine, Vanderbilt University Medical Center, Nashville, TN 37232, USA
| | - James B. Atkinson
- Department of Pathology, Vanderbilt University Medical Center, Nashville, TN 37232, USA
| | | | - Thomas C. Irving
- BioCAT, Department of Biological Sciences, Illinois Institute of Technology, Chicago, IL 60616, USA
| | - Prescott Bryant Chase
- Department of Biological Science, Florida State University, Tallahassee, FL 32306, USA
| | - Björn C. Knollmann
- Department of Medicine, Division of Cardiovascular Medicine, Vanderbilt University Medical Center, Nashville, TN 37232, USA
| | - Jose Renato Pinto
- Biomedical Sciences, Florida State University, Tallahassee, FL 32306, USA
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Xiao Q, Wang D, Li D, Huang J, Ma F, Zhang H, Sheng Y, Zhang C, Ha X. Protein kinase C: A potential therapeutic target for endothelial dysfunction in diabetes. J Diabetes Complications 2023; 37:108565. [PMID: 37540984 DOI: 10.1016/j.jdiacomp.2023.108565] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/25/2023] [Revised: 07/13/2023] [Accepted: 07/22/2023] [Indexed: 08/06/2023]
Abstract
Protein kinase C (PKC) is a family of serine/threonine protein kinases that play an important role in many organs and systems and whose activation contributes significantly to endothelial dysfunction in diabetes. The increase in diacylglycerol (DAG) under high glucose conditions mediates PKC activation and synthesis, which stimulates oxidative stress and inflammation, resulting in impaired endothelial cell function. This article reviews the contribution of PKC to the development of diabetes-related endothelial dysfunction and summarizes the drugs that inhibit PKC activation, with the aim of exploring therapeutic modalities that may alleviate endothelial dysfunction in diabetic patients.
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Affiliation(s)
- Qian Xiao
- Department of Laboratory, Ninth Forty Hospital of the Chinese People's Liberation Army Joint Security Force, Lanzhou 730050, Gansu, China; School of Public Health, Gansu University of Traditional Chinese Medicine, Lanzhou 730000, Gansu, China
| | - Dan Wang
- Department of Laboratory, Ninth Forty Hospital of the Chinese People's Liberation Army Joint Security Force, Lanzhou 730050, Gansu, China; School of Public Health, Gansu University of Traditional Chinese Medicine, Lanzhou 730000, Gansu, China
| | - Danyang Li
- School of Public Health, Gansu University of Traditional Chinese Medicine, Lanzhou 730000, Gansu, China
| | - Jing Huang
- Department of Laboratory, Ninth Forty Hospital of the Chinese People's Liberation Army Joint Security Force, Lanzhou 730050, Gansu, China; School of Public Health, Gansu University of Traditional Chinese Medicine, Lanzhou 730000, Gansu, China
| | - Feifei Ma
- Department of Laboratory, Ninth Forty Hospital of the Chinese People's Liberation Army Joint Security Force, Lanzhou 730050, Gansu, China; College of Veterinary Medicine, Gansu Agriculture University, Lanzhou 730070, Gansu, China
| | - Haocheng Zhang
- Department of Laboratory, Ninth Forty Hospital of the Chinese People's Liberation Army Joint Security Force, Lanzhou 730050, Gansu, China; The Second School of Clinical Medicine, Lanzhou University, Lanzhou, 730030, Gansu, China
| | - Yingda Sheng
- Department of Laboratory, Ninth Forty Hospital of the Chinese People's Liberation Army Joint Security Force, Lanzhou 730050, Gansu, China; School of Public Health, Gansu University of Traditional Chinese Medicine, Lanzhou 730000, Gansu, China
| | - Caimei Zhang
- Department of Laboratory, Ninth Forty Hospital of the Chinese People's Liberation Army Joint Security Force, Lanzhou 730050, Gansu, China; School of Public Health, Gansu University of Traditional Chinese Medicine, Lanzhou 730000, Gansu, China
| | - Xiaoqin Ha
- Department of Laboratory, Ninth Forty Hospital of the Chinese People's Liberation Army Joint Security Force, Lanzhou 730050, Gansu, China; School of Public Health, Gansu University of Traditional Chinese Medicine, Lanzhou 730000, Gansu, China.
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Wang C, Ramahdita G, Genin G, Huebsch N, Ma Z. Dynamic mechanobiology of cardiac cells and tissues: Current status and future perspective. BIOPHYSICS REVIEWS 2023; 4:011314. [PMID: 37008887 PMCID: PMC10062054 DOI: 10.1063/5.0141269] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/04/2023] [Accepted: 03/08/2023] [Indexed: 03/31/2023]
Abstract
Mechanical forces impact cardiac cells and tissues over their entire lifespan, from development to growth and eventually to pathophysiology. However, the mechanobiological pathways that drive cell and tissue responses to mechanical forces are only now beginning to be understood, due in part to the challenges in replicating the evolving dynamic microenvironments of cardiac cells and tissues in a laboratory setting. Although many in vitro cardiac models have been established to provide specific stiffness, topography, or viscoelasticity to cardiac cells and tissues via biomaterial scaffolds or external stimuli, technologies for presenting time-evolving mechanical microenvironments have only recently been developed. In this review, we summarize the range of in vitro platforms that have been used for cardiac mechanobiological studies. We provide a comprehensive review on phenotypic and molecular changes of cardiomyocytes in response to these environments, with a focus on how dynamic mechanical cues are transduced and deciphered. We conclude with our vision of how these findings will help to define the baseline of heart pathology and of how these in vitro systems will potentially serve to improve the development of therapies for heart diseases.
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Affiliation(s)
| | - Ghiska Ramahdita
- Department of Biomedical Engineering, Washington University in St. Louis, St. Louis, Missouri 63130, USA
| | | | | | - Zhen Ma
- Authors to whom correspondence should be addressed: and
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The focal adhesion protein β-parvin controls cardiomyocyte shape and sarcomere assembly in response to mechanical load. Curr Biol 2022; 32:3033-3047.e9. [PMID: 35688156 DOI: 10.1016/j.cub.2022.05.047] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2021] [Revised: 04/12/2022] [Accepted: 05/17/2022] [Indexed: 01/01/2023]
Abstract
Physiological and pathological cardiac stress induced by exercise and hypertension, respectively, increase the hemodynamic load for the heart and trigger specific hypertrophic signals in cardiomyocytes leading to adaptive or maladaptive cardiac hypertrophy responses involving a mechanosensitive remodeling of the contractile cytoskeleton. Integrins sense load and have been implicated in cardiac hypertrophy, but how they discriminate between the two types of cardiac stress and translate mechanical loads into specific cytoskeletal signaling pathways is not clear. Here, we report that the focal adhesion protein β-parvin is highly expressed in cardiomyocytes and facilitates the formation of cell protrusions, the serial assembly of newly synthesized sarcomeres, and the hypertrophic growth of neonatal rat ventricular cardiomyocytes (NRVCs) in vitro. In addition, physiological mechanical loading of NRVCs by either the application of cyclic, uni-axial stretch, or culture on physiologically stiff substrates promotes NRVC elongation in a β-parvin-dependent manner, which is achieved by binding of β-parvin to α/β-PIX, which in turn activates Rac1. Importantly, loss-of-function studies in mice also revealed that β-parvin is essential for the exercise-induced cardiac hypertrophy response in vivo. Our results identify β-parvin as a novel mechano-responsive signaling hub in hypertrophic cardiomyocytes that drives cell elongation in response to physiological mechanical loads.
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Mehrotra S, de Melo BAG, Miscuglio M, Kiaee K, Shin SR, Mandal BB. Mimicking Native Heart Tissue Physiology and Pathology in Silk Fibroin Constructs through a Perfusion-Based Dynamic Mechanical Stimulation Microdevice. Adv Healthc Mater 2022; 11:e2101678. [PMID: 34971210 PMCID: PMC11041525 DOI: 10.1002/adhm.202101678] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2021] [Revised: 12/23/2021] [Indexed: 11/07/2022]
Abstract
In vitro cardiomyocyte (CM) maturation is an imperative step to replicate native heart tissue-like structures as cardiac tissue grafts or as drug screening platforms. CMs are known to interpret biophysical cues such as stiffness, topography, external mechanical stimulation or dynamic perfusion load through mechanotransduction and change their behavior, organization, and maturation. In this regard, a silk-based cardiac tissue (CT) coupled with a dynamic perfusion-based mechanical stimulation platform (DMM) for achieving maturation and functionality in vitro is tried to be delivered. Silk fibroin (SF) is used to fabricate lamellar scaffolds to provide native tissue-like anisotropic architecture and is found to be nonimmunogenic and biocompatible allowing cardiomyocyte attachment and growth in vitro. Further, the scaffolds display excellent mechanical properties by their ability to undergo cyclic compressions without any deformation when places in the DMM. Gradient compression strains (5% to 20%), mimicking the native physiological and pathological conditions, are applied to the cardiomyocyte culture seeded on lamellar silk scaffolds in the DMM. A strain-dependent difference in cardiomyocyte maturation, gene expression, sarcomere elongation, and extracellular matrix formation is observed. These silk-based CTs matured in the DMM can open up several avenues toward the development of host-specific grafts and in vitro models for drug screening.
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Affiliation(s)
- Shreya Mehrotra
- Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati, Guwahati, Assam, 781039, India
- Division of Engineering in Medicine, Department of Medicine, Harvard Medical School, and Brigham and Women's Hospital, Cambridge, MA, 02139, USA
| | - Bruna Alice Gomes de Melo
- Division of Engineering in Medicine, Department of Medicine, Harvard Medical School, and Brigham and Women's Hospital, Cambridge, MA, 02139, USA
- Department of Biochemistry, Escola Paulista de Medicina, Universidade Federal de São Paulo, São Paulo, SP, 04039-002, Brazil
| | - Mario Miscuglio
- Division of Engineering in Medicine, Department of Medicine, Harvard Medical School, and Brigham and Women's Hospital, Cambridge, MA, 02139, USA
- Department of Electrical and Computer Engineering, George Washington University, Washington, DC, 20052, USA
| | - Kiavash Kiaee
- Division of Engineering in Medicine, Department of Medicine, Harvard Medical School, and Brigham and Women's Hospital, Cambridge, MA, 02139, USA
| | - Su Ryon Shin
- Division of Engineering in Medicine, Department of Medicine, Harvard Medical School, and Brigham and Women's Hospital, Cambridge, MA, 02139, USA
| | - Biman B Mandal
- Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati, Guwahati, Assam, 781039, India
- Centre for Nanotechnology, Indian Institute of Technology Guwahati, Guwahati, Assam, 781039, India
- School of Health Sciences and Technology, Indian Institute of Technology Guwahati, Guwahati, Assam, 781039, India
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10
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Dittloff KT, Spanghero E, Solís C, Banach K, Russell B. Transthyretin deposition alters cardiomyocyte sarcomeric architecture, calcium transients, and contractile force. Physiol Rep 2022; 10:e15207. [PMID: 35262277 PMCID: PMC8906053 DOI: 10.14814/phy2.15207] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2021] [Revised: 01/20/2022] [Accepted: 02/06/2022] [Indexed: 06/14/2023] Open
Abstract
Age-related wild-type transthyretin amyloidosis (wtATTR) is characterized by systemic deposition of amyloidogenic fibrils of misfolded transthyretin (TTR) in the connective tissue of many organs. In the heart, this leads to age-related heart failure with preserved ejection fraction (HFpEF). The hypothesis tested is that TTR deposited in vitro disrupts cardiac myocyte cell-to-cell and cell-to-matrix adhesion complexes, resulting in altered calcium handling, force generation, and sarcomeric disorganization. Human iPSC-derived cardiomyocytes and neonatal rat ventricular myocytes (NRVMs), when grown on TTR-coated polymeric substrata mimicking the stiffness of the healthy human myocardium (10 kPa), had decreased contraction and relaxation velocities as well as decreased force production measured using traction force microscopy. Both NRVMs and adult mouse atrial cardiomyocytes had altered calcium kinetics with prolonged transients when cultured on TTR fibril-coated substrates. Furthermore, NRVMs grown on stiff (~GPa), flat or microgrooved substrates coated with TTR fibrils exhibited significantly decreased intercellular electrical coupling as shown by FRAP dynamics of cells loaded with the gap junction-permeable dye calcein-AM, along with decreased gap junction content as determined by quantitative connexin 43 staining. Significant sarcomeric disorganization and loss of sarcomere content, with increased ubiquitin localization to the sarcomere, were seen in NRVMs on various TTR fibril-coated substrata. TTR presence decreased intercellular mechanical junctions as evidenced by quantitative immunofluorescence staining of N-cadherin and vinculin. Current therapies for wtATTR are cost-prohibitive and only slow the disease progression; therefore, better understanding of cardiomyocyte maladaptation induced by TTR amyloid may identify novel therapeutic targets.
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Affiliation(s)
- Kyle T. Dittloff
- Department of Physiology and BiophysicsUniversity of Illinois at ChicagoChicagoIllinoisUSA
| | - Emanuele Spanghero
- Department of Biomedical EngineeringUniversity of Illinois at ChicagoChicagoIllinoisUSA
| | - Christopher Solís
- Department of Physiology and BiophysicsUniversity of Illinois at ChicagoChicagoIllinoisUSA
| | - Kathrin Banach
- Department of Internal Medicine/CardiologyRush University Medical CenterChicagoIllinoisUSA
| | - Brenda Russell
- Department of Physiology and BiophysicsUniversity of Illinois at ChicagoChicagoIllinoisUSA
- Department of Biomedical EngineeringUniversity of Illinois at ChicagoChicagoIllinoisUSA
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11
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Xu J, Feng L, Wang J, Liu M, Li P, Fan Y. Study on the Influence of Shear Stress and Pulse Electrical Stimulation to the Growth of Cardiomyocytes. J Biomed Nanotechnol 2022; 18:132-143. [PMID: 35180906 DOI: 10.1166/jbn.2022.3234] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Engineered myocardial tissue is expected to be used in the treatment of myocardial defects and other diseases, and one of the keys is to construct a suitable environment for the culture of myocardial tissue in vitro. In this study, flow shear stress and pulse electrical stimulation were applied to cardiomyocytes with a self-designed device by simulating the mechanical and electrical physiological microenvironment of myocardial tissue. The strength and duration of pulse electrical stimulation as well as the intensity of shear stress were studied in detail to optimize the experimental parameters. Concretely, 100 mV pulse electrical stimulation (1 Hz and 10 ms pulse width) and 10 dyn/cm² shear stress were used for studying the influence of combined mechanical-electrical stimulation to the growth of cardiomyocytes. The mechanical factor of the combined stimulation promoted the expression of α-cardiac actin mRNA, the electrical factor caused an increase in Cx-43 mRNA expression, and shear stress and pulse electrical stimulation showed a synergistic action on the expression of GATA-4 mRNA. It indicated that combined mechanical-electrical stimulation had a better effect on the functionalized culture of cardiomyocytes, which provided an important theoretical basis for the further construction of in vitro engineered myocardial tissue.
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Affiliation(s)
- Junwei Xu
- Key Laboratory of Biomechanics and Mechanobiology (Beihang University), Ministry of Education, Beijing Advanced Innovation Center for Biomedical Engineering, School of Biological Science and Medical Engineering, Beihang University, Beijing, 100083, PR China
| | - Limin Feng
- Key Laboratory of Biomechanics and Mechanobiology (Beihang University), Ministry of Education, Beijing Advanced Innovation Center for Biomedical Engineering, School of Biological Science and Medical Engineering, Beihang University, Beijing, 100083, PR China
| | - Jingxi Wang
- Key Laboratory of Biomechanics and Mechanobiology (Beihang University), Ministry of Education, Beijing Advanced Innovation Center for Biomedical Engineering, School of Biological Science and Medical Engineering, Beihang University, Beijing, 100083, PR China
| | - Meili Liu
- Key Laboratory of Biomechanics and Mechanobiology (Beihang University), Ministry of Education, Beijing Advanced Innovation Center for Biomedical Engineering, School of Biological Science and Medical Engineering, Beihang University, Beijing, 100083, PR China
| | - Ping Li
- Key Laboratory of Biomechanics and Mechanobiology (Beihang University), Ministry of Education, Beijing Advanced Innovation Center for Biomedical Engineering, School of Biological Science and Medical Engineering, Beihang University, Beijing, 100083, PR China
| | - Yubo Fan
- Key Laboratory of Biomechanics and Mechanobiology (Beihang University), Ministry of Education, Beijing Advanced Innovation Center for Biomedical Engineering, School of Biological Science and Medical Engineering, Beihang University, Beijing, 100083, PR China
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12
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Solís C, Russell B. Striated muscle proteins are regulated both by mechanical deformation and by chemical post-translational modification. Biophys Rev 2021; 13:679-695. [PMID: 34777614 DOI: 10.1007/s12551-021-00835-4] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2021] [Accepted: 08/23/2021] [Indexed: 01/09/2023] Open
Abstract
All cells sense force and build their cytoskeleton to optimize function. How is this achieved? Two major systems are involved. The first is that load deforms specific protein structures in a proportional and orientation-dependent manner. The second is post-translational modification of proteins as a consequence of signaling pathway activation. These two processes work together in a complex way so that local subcellular assembly as well as overall cell function are controlled. This review discusses many cell types but focuses on striated muscle. Detailed information is provided on how load deforms the structure of proteins in the focal adhesions and filaments, using α-actinin, vinculin, talin, focal adhesion kinase, LIM domain-containing proteins, filamin, myosin, titin, and telethonin as examples. Second messenger signals arising from external triggers are distributed throughout the cell causing post-translational or chemical modifications of protein structures, with the actin capping protein CapZ and troponin as examples. There are numerous unanswered questions of how mechanical and chemical signals are integrated by muscle proteins to regulate sarcomere structure and function yet to be studied. Therefore, more research is needed to see how external triggers are integrated with local tension generated within the cell. Nonetheless, maintenance of tension in the sarcomere is the essential and dominant mechanism, leading to the well-known phrase in exercise physiology: "use it or lose it."
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Affiliation(s)
- Christopher Solís
- Department of Physiology and Biophysics, College of Medicine, University of Illinois at Chicago, Chicago, IL 60612 USA
| | - Brenda Russell
- Department of Physiology and Biophysics, College of Medicine, University of Illinois at Chicago, Chicago, IL 60612 USA
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13
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Capote AE, Batra A, Warren CM, Chowdhury SAK, Wolska BM, Solaro RJ, Rosas PC. B-arrestin-2 Signaling Is Important to Preserve Cardiac Function During Aging. Front Physiol 2021; 12:696852. [PMID: 34512376 PMCID: PMC8430342 DOI: 10.3389/fphys.2021.696852] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2021] [Accepted: 07/26/2021] [Indexed: 12/25/2022] Open
Abstract
Experiments reported here tested the hypothesis that β-arrestin-2 is an important element in the preservation of cardiac function during aging. We tested this hypothesis by aging β-arrestin-2 knock-out (KO) mice, and wild-type equivalent (WT) to 12–16months. We developed the rationale for these experiments on the basis that angiotensin II (ang II) signaling at ang II receptor type 1 (AT1R), which is a G-protein coupled receptor (GPCR) promotes both G-protein signaling as well as β-arrestin-2 signaling. β-arrestin-2 participates in GPCR desensitization, internalization, but also acts as a scaffold for adaptive signal transduction that may occur independently or in parallel to G-protein signaling. We have previously reported that biased ligands acting at the AT1R promote β-arrestin-2 signaling increasing cardiac contractility and reducing maladaptations in a mouse model of dilated cardiomyopathy. Although there is evidence that ang II induces maladaptive senescence in the cardiovascular system, a role for β-arrestin-2 signaling has not been studied in aging. By echocardiography, we found that compared to controls aged KO mice exhibited enlarged left atria and left ventricular diameters as well as depressed contractility parameters with preserved ejection fraction. Aged KO also exhibited depressed relaxation parameters when compared to WT controls at the same age. Moreover, cardiac dysfunction in aged KO mice was correlated with alterations in the phosphorylation of myofilament proteins, such as cardiac myosin binding protein-C, and myosin regulatory light chain. Our evidence provides novel insights into a role for β-arrestin-2 as an important signaling mechanism that preserves cardiac function during aging.
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Affiliation(s)
- Andrielle E Capote
- Department of Physiology & Biophysics, Center for Cardiovascular Research, University of Illinois at Chicago, Chicago, IL, United States
| | - Ashley Batra
- Department of Physiology & Biophysics, Center for Cardiovascular Research, University of Illinois at Chicago, Chicago, IL, United States
| | - Chad M Warren
- Department of Physiology & Biophysics, Center for Cardiovascular Research, University of Illinois at Chicago, Chicago, IL, United States
| | - Shamim A K Chowdhury
- Department of Physiology & Biophysics, Center for Cardiovascular Research, University of Illinois at Chicago, Chicago, IL, United States
| | - Beata M Wolska
- Department of Physiology & Biophysics, Center for Cardiovascular Research, University of Illinois at Chicago, Chicago, IL, United States.,Department of Medicine, Division of Cardiology, Center for Cardiovascular Research, University of Illinois at Chicago, Chicago, IL, United States
| | - R John Solaro
- Department of Physiology & Biophysics, Center for Cardiovascular Research, University of Illinois at Chicago, Chicago, IL, United States
| | - Paola C Rosas
- Department of Physiology & Biophysics, Center for Cardiovascular Research, University of Illinois at Chicago, Chicago, IL, United States
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14
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Miyashita Y, Tsukamoto O, Matsuoka K, Kamikubo K, Kuramoto Y, Ying Fu H, Tsubota T, Hasuike H, Takayama T, Ito H, Hitsumoto T, Okamoto C, Kioka H, Oya R, Shinomiya H, Hakui H, Shintani Y, Kato H, Kitakaze M, Sakata Y, Asano Y, Takashima S. The CR9 element is a novel mechanical load-responsive enhancer that regulates natriuretic peptide genes expression. FASEB J 2021; 35:e21495. [PMID: 33689182 DOI: 10.1096/fj.202002111rr] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2020] [Revised: 02/16/2021] [Accepted: 02/17/2021] [Indexed: 11/11/2022]
Abstract
Enhancers regulate gene expressions in a tissue- and pathology-specific manner by altering its activities. Plasma levels of atrial and brain natriuretic peptides, encoded by the Nppa and Nppb, respectively, and synthesized predominantly in cardiomyocytes, vary depending on the severity of heart failure. We previously identified the noncoding conserved region 9 (CR9) element as a putative Nppb enhancer at 22-kb upstream from the Nppb gene. However, its regulatory mechanism remains unknown. Here, we therefore investigated the mechanism of CR9 activation in cardiomyocytes using different kinds of drugs that induce either cardiac hypertrophy or cardiac failure accompanied by natriuretic peptides upregulation. Chronic treatment of mice with either catecholamines or doxorubicin increased CR9 activity during the progression of cardiac hypertrophy to failure, which is accompanied by proportional increases in Nppb expression. Conversely, for cultured cardiomyocytes, doxorubicin decreased CR9 activity and Nppb expression, while catecholamines increased both. However, exposing cultured cardiomyocytes to mechanical loads, such as mechanical stretch or hydrostatic pressure, upregulate CR9 activity and Nppb expression even in the presence of doxorubicin. Furthermore, the enhancement of CR9 activity and Nppa and Nppb expressions by either catecholamines or mechanical loads can be blunted by suppressing mechanosensing and mechanotransduction pathways, such as muscle LIM protein (MLP) or myosin tension. Finally, the CR9 element showed a more robust and cell-specific response to mechanical loads than the -520-bp BNP promoter. We concluded that the CR9 element is a novel enhancer that responds to mechanical loads by upregulating natriuretic peptides expression in cardiomyocytes.
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Affiliation(s)
- Yohei Miyashita
- Department of Medical Biochemistry, Graduate School of Medicine/Frontier Biosciences, Osaka University, Suita, Japan.,Department of Legal Medicine, Graduate School of Medicine, Osaka University, Suita, Japan.,Department of Cardiovascular Medicine, Graduate School of Medicine, Osaka University, Suita, Japan
| | - Osamu Tsukamoto
- Department of Medical Biochemistry, Graduate School of Medicine/Frontier Biosciences, Osaka University, Suita, Japan
| | - Ken Matsuoka
- Department of Medical Biochemistry, Graduate School of Medicine/Frontier Biosciences, Osaka University, Suita, Japan
| | - Kenta Kamikubo
- Department of Medical Biochemistry, Graduate School of Medicine/Frontier Biosciences, Osaka University, Suita, Japan
| | - Yuki Kuramoto
- Department of Cardiovascular Medicine, Graduate School of Medicine, Osaka University, Suita, Japan
| | - Hai Ying Fu
- Department of Cardiorenal and Cerebrovascular Medicine, Faculty of Medicine, Kagawa University, Takamatsu, Japan
| | - Tomoya Tsubota
- Department of Medical Biochemistry, Graduate School of Medicine/Frontier Biosciences, Osaka University, Suita, Japan
| | - Hirona Hasuike
- Department of Medical Biochemistry, Graduate School of Medicine/Frontier Biosciences, Osaka University, Suita, Japan
| | - Toshio Takayama
- School of Engineering, Department of Mechanical Engineering, Tokyo Institute of Technology, Tokyo, Japan
| | - Hiroaki Ito
- Department of Physics, Graduate School of Science, Chiba University, Chiba, Japan
| | - Tatsuro Hitsumoto
- Department of Medical Biochemistry, Graduate School of Medicine/Frontier Biosciences, Osaka University, Suita, Japan
| | - Chisato Okamoto
- Department of Medical Biochemistry, Graduate School of Medicine/Frontier Biosciences, Osaka University, Suita, Japan
| | - Hidetaka Kioka
- Department of Cardiovascular Medicine, Graduate School of Medicine, Osaka University, Suita, Japan
| | - Ryohei Oya
- Department of Medical Biochemistry, Graduate School of Medicine/Frontier Biosciences, Osaka University, Suita, Japan
| | - Haruki Shinomiya
- Department of Cardiovascular Medicine, Graduate School of Medicine, Osaka University, Suita, Japan
| | - Hideyuki Hakui
- Department of Cardiovascular Medicine, Graduate School of Medicine, Osaka University, Suita, Japan
| | - Yasunori Shintani
- Department of Molecular Pharmacology, National Cerebral and Cardiovascular Center, Suita, Japan
| | - Hisakazu Kato
- Department of Medical Biochemistry, Graduate School of Medicine/Frontier Biosciences, Osaka University, Suita, Japan
| | | | - Yasushi Sakata
- Department of Cardiovascular Medicine, Graduate School of Medicine, Osaka University, Suita, Japan
| | - Yoshihiro Asano
- Department of Cardiovascular Medicine, Graduate School of Medicine, Osaka University, Suita, Japan
| | - Seiji Takashima
- Department of Medical Biochemistry, Graduate School of Medicine/Frontier Biosciences, Osaka University, Suita, Japan
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15
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Russell B, Solís C. Mechanosignaling pathways alter muscle structure and function by post-translational modification of existing sarcomeric proteins to optimize energy usage. J Muscle Res Cell Motil 2021; 42:367-380. [PMID: 33595762 DOI: 10.1007/s10974-021-09596-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2020] [Accepted: 01/04/2021] [Indexed: 12/29/2022]
Abstract
A transduced mechanical signal arriving at its destination in muscle alters sarcomeric structure and function. A major question addressed is how muscle mass and tension generation are optimized to match actual performance demands so that little energy is wasted. Three cases for improved energy efficiency are examined: the troponin complex for tuning force production, control of the myosin heads in a resting state, and the Z-disc proteins for sarcomere assembly. On arrival, the regulation of protein complexes is often controlled by post-translational modification (PTM), of which the most common are phosphorylation by kinases, deacetylation by histone deacetylases and ubiquitination by E3 ligases. Another branch of signals acts not through peptide covalent bonding but via ligand interactions (e.g. Ca2+ and phosphoinositide binding). The myosin head and the regulation of its binding to actin by the troponin complex is the best and earliest example of signal destinations that modify myofibrillar contractility. PTMs in the troponin complex regulate both the efficiency of the contractile function to match physiologic demand for work, and muscle mass via protein degradation. The regulation of sarcomere assembly by integration of incoming signaling pathways causing the same PTMs or ligand binding are discussed in response to mechanical loading and unloading by the Z-disc proteins CapZ, α-actinin, telethonin, titin N-termini, and others. Many human mutations that lead to cardiomyopathy and heart disease occur in the proteins discussed above, which often occur at their PTM or ligand binding sites.
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Affiliation(s)
- Brenda Russell
- Department of Physiology and Biophysics, College of Medicine, University of Illinois at Chicago, Chicago, IL, 60612, USA.
| | - Christopher Solís
- Department of Physiology and Biophysics, College of Medicine, University of Illinois at Chicago, Chicago, IL, 60612, USA
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16
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Vannan MA, Tridetti J, Lancellotti P. Intervention In Severe Aortic Stenosis: It May Be Time When the Left Ventricle Says So. J Am Coll Cardiol 2020; 75:2459-2462. [PMID: 32408980 DOI: 10.1016/j.jacc.2020.04.007] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/27/2020] [Revised: 04/02/2020] [Accepted: 04/06/2020] [Indexed: 11/25/2022]
Affiliation(s)
- Mani A Vannan
- Piedmont Heart Institute, Marcus Heart Valve Center, Atlanta, Georgia.
| | - Julien Tridetti
- Groupement Interdisciplinaire de Génoprotéomique Appliquée Cardiovascular Sciences, University of Liège Hospital, Centre Hospitalier Universitaire Sart Tilman, Liege, Belgium
| | - Patrizio Lancellotti
- Groupement Interdisciplinaire de Génoprotéomique Appliquée Cardiovascular Sciences, University of Liège Hospital, Centre Hospitalier Universitaire Sart Tilman, Liege, Belgium; Gruppo Villa Maria Care and Research, Maria Cecilia Hospital, Cotignola, Italy; Anthea Hospital, Bari, Italy
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17
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Krajnik A, Brazzo JA, Vaidyanathan K, Das T, Redondo-Muñoz J, Bae Y. Phosphoinositide Signaling and Mechanotransduction in Cardiovascular Biology and Disease. Front Cell Dev Biol 2020; 8:595849. [PMID: 33381504 PMCID: PMC7767973 DOI: 10.3389/fcell.2020.595849] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2020] [Accepted: 11/25/2020] [Indexed: 12/14/2022] Open
Abstract
Phosphoinositides, which are membrane-bound phospholipids, are critical signaling molecules located at the interface between the extracellular matrix, cell membrane, and cytoskeleton. Phosphoinositides are essential regulators of many biological and cellular processes, including but not limited to cell migration, proliferation, survival, and differentiation, as well as cytoskeletal rearrangements and actin dynamics. Over the years, a multitude of studies have uniquely implicated phosphoinositide signaling as being crucial in cardiovascular biology and a dominant force in the development of cardiovascular disease and its progression. Independently, the cellular transduction of mechanical forces or mechanotransduction in cardiovascular cells is widely accepted to be critical to their homeostasis and can drive aberrant cellular phenotypes and resultant cardiovascular disease. Given the versatility and diversity of phosphoinositide signaling in the cardiovascular system and the dominant regulation of cardiovascular cell functions by mechanotransduction, the molecular mechanistic overlap and extent to which these two major signaling modalities converge in cardiovascular cells remain unclear. In this review, we discuss and synthesize recent findings that rightfully connect phosphoinositide signaling to cellular mechanotransduction in the context of cardiovascular biology and disease, and we specifically focus on phosphatidylinositol-4,5-phosphate, phosphatidylinositol-4-phosphate 5-kinase, phosphatidylinositol-3,4,5-phosphate, and phosphatidylinositol 3-kinase. Throughout the review, we discuss how specific phosphoinositide subspecies have been shown to mediate biomechanically sensitive cytoskeletal remodeling in cardiovascular cells. Additionally, we discuss the direct interaction of phosphoinositides with mechanically sensitive membrane-bound ion channels in response to mechanical stimuli. Furthermore, we explore the role of phosphoinositide subspecies in association with critical downstream effectors of mechanical signaling in cardiovascular biology and disease.
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Affiliation(s)
- Amanda Krajnik
- Department of Pathology and Anatomical Sciences, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo, State University of New York, Buffalo, NY, United States
| | - Joseph A Brazzo
- Department of Pathology and Anatomical Sciences, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo, State University of New York, Buffalo, NY, United States
| | - Kalyanaraman Vaidyanathan
- Department of Pathology and Anatomical Sciences, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo, State University of New York, Buffalo, NY, United States
| | - Tuhin Das
- Cell Biology Program, Memorial Sloan Kettering Cancer Center, New York, NY, United States
| | - Javier Redondo-Muñoz
- Department of Molecular Biomedicine, Centro de Investigaciones Biológicas Margarita Salas, Madrid, Spain.,Lydia Becker Institute of Immunology and Inflammation, Faculty of Biology, Medicine and Health, School of Biological Sciences, University of Manchester, Manchester, United Kingdom
| | - Yongho Bae
- Department of Pathology and Anatomical Sciences, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo, State University of New York, Buffalo, NY, United States
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18
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Zhang R, Guo T, Han Y, Huang H, Shi J, Hu J, Li H, Wang J, Saleem A, Zhou P, Lan F. Design of synthetic microenvironments to promote the maturation of human pluripotent stem cell derived cardiomyocytes. J Biomed Mater Res B Appl Biomater 2020; 109:949-960. [PMID: 33231364 DOI: 10.1002/jbm.b.34759] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2020] [Revised: 10/08/2020] [Accepted: 11/10/2020] [Indexed: 12/19/2022]
Abstract
Cardiomyocyte like cells derived from human pluripotent stem cells (hPSC-CMs) have a good application perspective in many fields such as disease modeling, drug screening and clinical treatment. However, these are severely hampered by the fact that hPSC-CMs are immature compared to adult human cardiomyocytes. Therefore, many approaches such as genetic manipulation, biochemical factors supplement, mechanical stress, electrical stimulation and three-dimensional culture have been developed to promote the maturation of hPSC-CMs. Recently, establishing in vitro synthetic artificial microenvironments based on the in vivo development program of cardiomyocytes has achieved much attention due to their inherent properties such as stiffness, plasticity, nanotopography and chemical functionality. In this review, the achievements and deficiency of reported synthetic microenvironments that mainly discussed comprehensive biological, chemical, and physical factors, as well as three-dimensional culture were mainly discussed, which have significance to improve the microenvironment design and accelerate the maturation of hPSC-CMs.
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Affiliation(s)
- Rui Zhang
- School and hospital of Stomatology, Lanzhou University, Lanzhou, China.,College of Life Sciences, Lanzhou University, Lanzhou, China
| | - Tianwei Guo
- Beijing Anzhen Hospital, Capital Medical University, Beijing, China
| | - Yu Han
- School and hospital of Stomatology, Lanzhou University, Lanzhou, China
| | - Hongxin Huang
- School and hospital of Stomatology, Lanzhou University, Lanzhou, China
| | - Jiamin Shi
- College of Life Sciences, Lanzhou University, Lanzhou, China
| | - Jiaxuan Hu
- College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, China
| | - Hongjiao Li
- School and hospital of Stomatology, Lanzhou University, Lanzhou, China
| | - Jianlin Wang
- College of Life Sciences, Lanzhou University, Lanzhou, China
| | - Amina Saleem
- Beijing Anzhen Hospital, Capital Medical University, Beijing, China
| | - Ping Zhou
- School and hospital of Stomatology, Lanzhou University, Lanzhou, China
| | - Feng Lan
- National Center for Cardiovascular Diseases, Fuwai Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
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19
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McEvoy E, Wijns W, McGarry P. A thermodynamic transient cross-bridge model for prediction of contractility and remodelling of the ventricle. J Mech Behav Biomed Mater 2020; 113:104074. [PMID: 33189012 DOI: 10.1016/j.jmbbm.2020.104074] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2019] [Revised: 01/20/2020] [Accepted: 08/27/2020] [Indexed: 12/16/2022]
Abstract
Cardiac hypertrophy is an adaption of the heart to a change in cardiovascular loading conditions. The current understanding is that progression may be stress or strain driven, but the multi-scale nature of the cellular remodelling processes have yet to be uncovered. In this study, we develop a model of the contractile left ventricle, with the active cell tension described by a thermodynamically motivated cross-bridge cycling model. Simulation of the transient recruitment of myosin results in correct patterns of ventricular pressure predicted over a cardiac cycle. We investigate how changes in tissue loading and associated deviations in transient force generation can drive restructuring of cellular myofibrils in the heart wall. Our thermodynamic framework predicts in-series sarcomere addition (eccentric remodelling) in response to volume overload, and sarcomere addition in parallel (concentric remodelling) in response to valve and signalling disfunction. This framework provides a significant advance in the current understanding of the fundamental sub-sarcomere level biomechanisms underlying cardiac remodelling. Simulations reveal that pathological tissue loading conditions can significantly alter actin-myosin cross-bridge cycling over the course of the cardiac cycle. The resultant variation in sarcomere stress pushes an imbalance between the internal free energy of the myofibril and that of unbound contractile proteins, initiating remodelling. The link between cross-bridge thermodynamics and myofibril remodelling proposed in this study may significantly advance current understanding of cardiac disease onset.
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Affiliation(s)
- Eoin McEvoy
- Biomedical Engineering, National University of Ireland, Galway, Ireland
| | - William Wijns
- The Lambe Institute for Translational Medicine, University Hospital, Galway, Ireland
| | - Patrick McGarry
- Biomedical Engineering, National University of Ireland, Galway, Ireland.
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20
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Niestrawska JA, Augustin CM, Plank G. Computational modeling of cardiac growth and remodeling in pressure overloaded hearts-Linking microstructure to organ phenotype. Acta Biomater 2020; 106:34-53. [PMID: 32058078 PMCID: PMC7311197 DOI: 10.1016/j.actbio.2020.02.010] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2019] [Revised: 02/06/2020] [Accepted: 02/07/2020] [Indexed: 12/25/2022]
Abstract
Cardiac growth and remodeling (G&R) refers to structural changes in myocardial tissue in response to chronic alterations in loading conditions. One such condition is pressure overload where elevated wall stresses stimulate the growth in cardiomyocyte thickness, associated with a phenotype of concentric hypertrophy at the organ scale, and promote fibrosis. The initial hypertrophic response can be considered adaptive and beneficial by favoring myocyte survival, but over time if pressure overload conditions persist, maladaptive mechanisms favoring cell death and fibrosis start to dominate, ultimately mediating the transition towards an overt heart failure phenotype. The underlying mechanisms linking biological factors at the myocyte level to biomechanical factors at the systemic and organ level remain poorly understood. Computational models of G&R show high promise as a unique framework for providing a quantitative link between myocardial stresses and strains at the organ scale to biological regulatory processes at the cellular level which govern the hypertrophic response. However, microstructurally motivated, rigorously validated computational models of G&R are still in their infancy. This article provides an overview of the current state-of-the-art of computational models to study cardiac G&R. The microstructure and mechanosensing/mechanotransduction within cells of the myocardium is discussed and quantitative data from previous experimental and clinical studies is summarized. We conclude with a discussion of major challenges and possible directions of future research that can advance the current state of cardiac G&R computational modeling. STATEMENT OF SIGNIFICANCE: The mechanistic links between organ-scale biomechanics and biological factors at the cellular size scale remain poorly understood as these are largely elusive to investigations using experimental methodology alone. Computational G&R models show high promise to establish quantitative links which allow more mechanistic insight into adaptation mechanisms and may be used as a tool for stratifying the state and predict the progression of disease in the clinic. This review provides a comprehensive overview of research in this domain including a summary of experimental data. Thus, this study may serve as a basis for the further development of more advanced G&R models which are suitable for making clinical predictions on disease progression or for testing hypotheses on pathogenic mechanisms using in-silico models.
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Affiliation(s)
- Justyna A Niestrawska
- Gottfried Schatz Research Center: Division of Biophysics, Medical University of Graz, Graz 8010, Austria
| | - Christoph M Augustin
- Gottfried Schatz Research Center: Division of Biophysics, Medical University of Graz, Graz 8010, Austria.
| | - Gernot Plank
- Gottfried Schatz Research Center: Division of Biophysics, Medical University of Graz, Graz 8010, Austria; BioTechMed-Graz, Austria
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21
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Pitoulis FG, Terracciano CM. Heart Plasticity in Response to Pressure- and Volume-Overload: A Review of Findings in Compensated and Decompensated Phenotypes. Front Physiol 2020; 11:92. [PMID: 32116796 PMCID: PMC7031419 DOI: 10.3389/fphys.2020.00092] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2019] [Accepted: 01/27/2020] [Indexed: 12/20/2022] Open
Abstract
The adult human heart has an exceptional ability to alter its phenotype to adapt to changes in environmental demand. This response involves metabolic, mechanical, electrical, and structural alterations, and is known as cardiac plasticity. Understanding the drivers of cardiac plasticity is essential for development of therapeutic agents. This is particularly important in contemporary cardiology, which uses treatments with peripheral effects (e.g., on kidneys, adrenal glands). This review focuses on the effects of different hemodynamic loads on myocardial phenotype. We examine mechanical scenarios of pressure- and volume overload, from the initial insult, to compensated, and ultimately decompensated stage. We discuss how different hemodynamic conditions occur and are underlined by distinct phenotypic and molecular changes. We complete the review by exploring how current basic cardiac research should leverage available cardiac models to study mechanical load in its different presentations.
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22
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Aboelkassem Y, Powers JD, McCabe KJ, McCulloch AD. Multiscale Models of Cardiac Muscle Biophysics and Tissue Remodeling in Hypertrophic Cardiomyopathies. CURRENT OPINION IN BIOMEDICAL ENGINEERING 2019; 11:35-44. [PMID: 31886450 DOI: 10.1016/j.cobme.2019.09.005] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Myocardial hypertrophy is the result of sustained perturbations to the mechanical and/or neurohormonal homeostasis of cardiac cells and is driven by integrated, multiscale biophysical and biochemical processes that are currently not well defined. In this brief review, we highlight recent computational and experimental models of cardiac hypertrophy that span mechanisms from the molecular level to the tissue level. Specifically, we focus on: (i) molecular-level models of the structural dynamics of sarcomere proteins in hypertrophic hearts, (ii) cellular-level models of excitation-contraction coupling and mechanosensitive signaling in disease-state myocytes, and (iii) organ-level models of myocardial growth kinematics and predictors thereof. Finally, we discuss how spanning these scales and combining multiple experimental/computational models will provide new information about the processes governing hypertrophy and potential methods to prevent or reverse them.
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Affiliation(s)
- Yasser Aboelkassem
- Department of Bioengineering, University of California San Diego, La Jolla, CA 92093, USA
| | - Joseph D Powers
- Department of Bioengineering, University of California San Diego, La Jolla, CA 92093, USA
| | - Kimberly J McCabe
- Department of Computational Physiology, Simula Research Laboratory, Lysaker, Norway
| | - Andrew D McCulloch
- Department of Bioengineering, University of California San Diego, La Jolla, CA 92093, USA
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Mechanical Forces Regulate Cardiomyocyte Myofilament Maturation via the VCL-SSH1-CFL Axis. Dev Cell 2019; 51:62-77.e5. [PMID: 31495694 DOI: 10.1016/j.devcel.2019.08.006] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2018] [Revised: 07/02/2019] [Accepted: 08/07/2019] [Indexed: 01/07/2023]
Abstract
Mechanical forces regulate cell behavior and tissue morphogenesis. During cardiac development, mechanical stimuli from the heartbeat are required for cardiomyocyte maturation, but the underlying molecular mechanisms remain unclear. Here, we first show that the forces of the contracting heart regulate the localization and activation of the cytoskeletal protein vinculin (VCL), which we find to be essential for myofilament maturation. To further analyze the role of VCL in this process, we examined its interactome in contracting versus non-contracting cardiomyocytes and, in addition to several known interactors, including actin regulators, identified the slingshot protein phosphatase SSH1. We show how VCL recruits SSH1 and its effector, the actin depolymerizing factor cofilin (CFL), to regulate F-actin rearrangement and promote cardiomyocyte myofilament maturation. Overall, our results reveal that mechanical forces generated by cardiac contractility regulate cardiomyocyte maturation through the VCL-SSH1-CFL axis, providing further insight into how mechanical forces are transmitted intracellularly to regulate myofilament maturation.
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Das S, Kim SW, Choi YJ, Lee S, Lee SH, Kong JS, Park HJ, Cho DW, Jang J. Decellularized extracellular matrix bioinks and the external stimuli to enhance cardiac tissue development in vitro. Acta Biomater 2019; 95:188-200. [PMID: 30986526 DOI: 10.1016/j.actbio.2019.04.026] [Citation(s) in RCA: 74] [Impact Index Per Article: 14.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2018] [Revised: 04/09/2019] [Accepted: 04/10/2019] [Indexed: 01/02/2023]
Abstract
Engineered heart tissue (EHT) has ample potential as a model for in vitro tissue modeling or tissue regeneration. Using 3D cell printing technology, various hydrogels have been utilized as bioinks to fabricate EHT to date. However, its efficacy has remained limited due to poor functional properties of the cultured cardiomyocytes stemming from a lack of proper microenvironmental cues. Specifically, the surrounding matrix plays a key role in modulating cardiomyocyte differentiation and maturation. Recently, the use of heart tissue-derived extracellular matrix (hdECM) bioink has come to be seen as one of the most promising candidates due to its functional and structural similarities to native tissue. Here, we demonstrated a correlation between the synthesis of cardiomyocyte-specific proteins and the surrounding microenvironment irrespective of the similar material chemistry. Primary cardiomyocytes isolated from neonatal rats were encapsulated in different composition and concentration of bioinks (hdECM and collagen). The bioinks were sequentially printed using an extrusion-based 3D bioprinter and cultured either statically or dynamically. Qualitative and quantitative evaluation revealed enhanced maturation of cardiomyocytes in hdECM, unlike the collagen group under similar culture conditions. Specifically, 3D-printed EHT using a low concentration of hdECM promoted early differentiation of cardiomyocytes. Hence, the present study provides experimental insights regarding the establishment of a 3D-printed cardiac tissue model, highlighting that the matrix and the culture microenvironment can be decisive factors for cell-material interactions that affect cardiomyocyte maturation. STATEMENT OF SIGNIFICANCE: The regulation of signal transduction and responses to extracellular matrices (ECMs) is of particular relevance in tissue maturation. In particular, there is a clear need to understand the structural and phenotypical modulation in cardiomyocytes with respect to the surrounding microenvironment. Exploration of the key regulators, such as the compositional and the biophysical properties of bioinks associated directly with cell-cell and cell-matrix interactions would assist with the fabrication of cardiac tissue constructs with enhanced functionality. Hence, we documented the synergistic effects of surrounding matrices and culture conditions on the maturation of cardiomyocytes. Additionally, we highlighted the potential of using 3D bioprinting techniques to fabricate uniformly aligned cardiac constructs for mid- to high-throughput drug testing platforms that have great reproducibility and versatility.
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Saucerman JJ, Tan PM, Buchholz KS, McCulloch AD, Omens JH. Mechanical regulation of gene expression in cardiac myocytes and fibroblasts. Nat Rev Cardiol 2019; 16:361-378. [PMID: 30683889 PMCID: PMC6525041 DOI: 10.1038/s41569-019-0155-8] [Citation(s) in RCA: 110] [Impact Index Per Article: 22.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
The intact heart undergoes complex and multiscale remodelling processes in response to altered mechanical cues. Remodelling of the myocardium is regulated by a combination of myocyte and non-myocyte responses to mechanosensitive pathways, which can alter gene expression and therefore function in these cells. Cellular mechanotransduction and its downstream effects on gene expression are initially compensatory mechanisms during adaptations to the altered mechanical environment, but under prolonged and abnormal loading conditions, they can become maladaptive, leading to impaired function and cardiac pathologies. In this Review, we summarize mechanoregulated pathways in cardiac myocytes and fibroblasts that lead to altered gene expression and cell remodelling under physiological and pathophysiological conditions. Developments in systems modelling of the networks that regulate gene expression in response to mechanical stimuli should improve integrative understanding of their roles in vivo and help to discover new combinations of drugs and device therapies targeting mechanosignalling in heart disease.
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Affiliation(s)
- Jeffrey J Saucerman
- Department of Biomedical Engineering, University of Virginia, Charlottesville, VA, USA
| | - Philip M Tan
- Department of Biomedical Engineering, University of Virginia, Charlottesville, VA, USA
| | - Kyle S Buchholz
- Departments of Bioengineering and Medicine, University of California San Diego, La Jolla, CA, USA
| | - Andrew D McCulloch
- Departments of Bioengineering and Medicine, University of California San Diego, La Jolla, CA, USA.
| | - Jeffrey H Omens
- Departments of Bioengineering and Medicine, University of California San Diego, La Jolla, CA, USA
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26
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Sahli Costabal F, Choy JS, Sack KL, Guccione JM, Kassab GS, Kuhl E. Multiscale characterization of heart failure. Acta Biomater 2019; 86:66-76. [PMID: 30630123 DOI: 10.1016/j.actbio.2018.12.053] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2018] [Revised: 12/28/2018] [Accepted: 12/31/2018] [Indexed: 12/27/2022]
Abstract
Dilated cardiomyopathy is a progressive irreversible disease associated with contractile dysfunction and heart failure. During dilated cardiomyopathy, elevated diastolic wall strains trigger mechanotransduction pathways that initiate the addition of sarcomeres in series and an overall increase in myocyte length. At the whole organ level, this results in a chronic dilation of the ventricles, an increase in end diastolic and end systolic volumes, and a decrease in ejection fraction. However, how exactly changes in sarcomere number translate into changes in myocyte morphology, and how these cellular changes translate into ventricular dilation remains incompletely understood. Here we combined a chronic animal study, continuum growth modeling, and machine learning to quantify correlations between sarcomere dynamics, myocyte morphology, and ventricular dilation. In an eight-week long volume overload study of six pigs, we found that the average sarcomere number increased by +3.8%/week, from 47 to 62, resulting in a myocyte lengthening of +3.3%/week, from 85 to 108 μm, while the sarcomere length and myocyte width remained unchanged. At the same time, the average end diastolic volume increased by +6.0%/week. Using continuum growth modeling and Bayesian inference, we correlated alterations on the subcellular, cellular, and organ scales and found that the serial sarcomere number explained 88% of myocyte lengthening, which, in turn, explained 54% of cardiac dilation. Our results demonstrate that sarcomere number and myocyte length are closely correlated and constitute the major determinants of dilated heart failure. We anticipate our study to be a starting point for more sophisticated multiscale models of heart failure. Our study suggests that altering sarcomere turnover-and with it myocyte morphology and ventricular dimensions-could be a potential therapeutic target to attenuate or reverse the progression of heart failure. STATEMENT OF SIGNIFICANCE: Heart failure is a significant global health problem that affects more than 25 million people worldwide and increases in prevalence as the population ages. Heart failure has been studied excessively at various scales; yet, there is no compelling concept to connect knowledge from the subcellular, cellular, and organ level across the scales. Here we combined a chronic animal study, continuum growth modeling, and machine learning to quantify correlations between sarcomere dynamics, myocyte morphology, and ventricular dilation. We found that the serial sarcomere number explained 88% of myocyte lengthening, which, in turn, explained 54% of cardiac dilation. Our results show that sarcomere number and myocyte length are closely correlated and constitute the major determinants of dilated heart failure. This suggests that altering the sarcomere turnover-and with it myocyte morphology and ventricular dimensions-could be a potential therapeutic target to attenuate or reverse heart failure.
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Affiliation(s)
- F Sahli Costabal
- Departments of Mechanical Engineering & Bioengineering, Stanford University, CA, USA
| | - J S Choy
- California Medical Innovations Institute, Inc., San Diego, CA, USA
| | - K L Sack
- Department of Human Biology, University of Cape Town, Cape Town, South Africa
| | - J M Guccione
- Department of Surgery, University of California at San Francisco, San Francisco, CA, USA
| | - G S Kassab
- California Medical Innovations Institute, Inc., San Diego, CA, USA
| | - E Kuhl
- Departments of Mechanical Engineering & Bioengineering, Stanford University, CA, USA.
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Bernheim-Groswasser A, Gov NS, Safran SA, Tzlil S. Living Matter: Mesoscopic Active Materials. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2018; 30:e1707028. [PMID: 30256463 DOI: 10.1002/adma.201707028] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/01/2017] [Revised: 03/27/2018] [Indexed: 06/08/2023]
Abstract
An introduction to the physical properties of living active matter at the mesoscopic scale (tens of nanometers to micrometers) and their unique features compared with "dead," nonactive matter is presented. This field of research is increasingly denoted as "biological physics" where physics includes chemical physics, soft matter physics, hydrodynamics, mechanics, and the related engineering sciences. The focus is on the emergent properties of these systems and their collective behavior, which results in active self-organization and how they relate to cellular-level biological function. These include locomotion (cell motility and migration) forces that give rise to cell division, the growth and form of cellular assemblies in development, the beating of heart cells, and the effects of mechanical perturbations such as shear flow (in the bloodstream) or adhesion to other cells or tissues. An introduction to the fundamental concepts and theory with selected experimental examples related to the authors' own research is presented, including red-blood-cell membrane fluctuations, motion of the nucleus within an egg cell, self-contracting acto-myosin gels, and structure and beating of heart cells (cardiomyocytes), including how they can be driven by an oscillating, mechanical probe.
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Affiliation(s)
- Anne Bernheim-Groswasser
- Department of Chemical Engineering and Ilse Katz Institute for Nanoscale Science and Technology, Ben Gurion University of the Negev, Beer-Sheva, 84105, Israel
| | - Nir S Gov
- Department of Chemical and Biological Physics, Weizmann Institute of Science, Rehovot, 7610001, Israel
| | - Samuel A Safran
- Department of Chemical and Biological Physics, Weizmann Institute of Science, Rehovot, 7610001, Israel
| | - Shelly Tzlil
- Department of Mechanical Engineering, Technion, Haifa, 3200003, Israel
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28
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Mkrtschjan MA, Solís C, Wondmagegn AY, Majithia J, Russell B. PKC epsilon signaling effect on actin assembly is diminished in cardiomyocytes when challenged to additional work in a stiff microenvironment. Cytoskeleton (Hoboken) 2018; 75:363-371. [PMID: 30019430 DOI: 10.1002/cm.21472] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2018] [Revised: 06/14/2018] [Accepted: 06/19/2018] [Indexed: 01/14/2023]
Abstract
The stiffness of the microenvironment surrounding a cell can result in cytoskeletal remodeling, leading to altered cell function and tissue macrostructure. In this study, we tuned the stiffness of the underlying substratum on which neonatal rat cardiomyocytes were grown in culture to mimic normal (10 kPa), pathological stiffness of fibrotic myocardium (100 kPa), and a nonphysiological extreme (glass). Cardiomyocytes were then challenged by beta adrenergic stimulation through isoproterenol treatment to investigate the response to acute work demand for cells grown on surfaces of varying stiffness. In particular, the PKCɛ signaling pathway and its role in actin assembly dynamics were examined. Significant changes in contractile metrics were seen on cardiomyocytes grown on different surfaces, but all cells responded to isoproterenol treatment, eventually reaching similar time to peak tension. In contrast, the assembly rate of actin was significantly higher on stiff surfaces, so that only cells grown on soft surfaces were able to respond to acute isoproterenol treatment. Förster Resonance Energy Transfer of immunofluorescence on the cytoskeletal fraction of cardiomyocytes confirmed that the molecular interaction of PKCɛ with the actin capping protein, CapZ, was very low on soft substrata but significantly increased with isoproterenol treatment, or on stiff substrata. Therefore, the stiffness of the culture surface chosen for in vitro experiments might mask the normal signaling and affect the ability to translate basic science more effectively into human therapy.
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Affiliation(s)
- Michael A Mkrtschjan
- Department of Bioengineering, University of Illinois at Chicago, Chicago, Illinois
| | - Christopher Solís
- Department of Physiology and Biophysics, University of Illinois at Chicago, Chicago, Illinois
| | - Admasu Y Wondmagegn
- Department of Physiology and Biophysics, University of Illinois at Chicago, Chicago, Illinois
| | - Janki Majithia
- Department of Physiology and Biophysics, University of Illinois at Chicago, Chicago, Illinois
| | - Brenda Russell
- Department of Physiology and Biophysics, University of Illinois at Chicago, Chicago, Illinois
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29
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Electromechanical effects of concentric hypertrophy on the left ventricle: A simulation study. Comput Biol Med 2018; 99:236-256. [DOI: 10.1016/j.compbiomed.2018.06.004] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2018] [Revised: 06/06/2018] [Accepted: 06/07/2018] [Indexed: 11/19/2022]
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Abstract
Heart failure (HF) is a physiological state in which cardiac output is insufficient to meet the needs of the body. It is a clinical syndrome characterized by impaired ability of the left ventricle to either fill or eject blood efficiently. HF is a disease of multiple aetiologies leading to progressive cardiac dysfunction and it is the leading cause of deaths in both developed and developing countries. HF is responsible for about 73,000 deaths in the UK each year. In the USA, HF affects 5.8 million people and 550,000 new cases are diagnosed annually. Cardiac remodelling (CD), which plays an important role in pathogenesis of HF, is viewed as stress response to an index event such as myocardial ischaemia or imposition of mechanical load leading to a series of structural and functional changes in the viable myocardium. Protein kinase C (PKC) isozymes are a family of serine/threonine kinases. PKC is a central enzyme in the regulation of growth, hypertrophy, and mediators of signal transduction pathways. In response to circulating hormones, activation of PKC triggers a multitude of intracellular events influencing multiple physiological processes in the heart, including heart rate, contraction, and relaxation. Recent research implicates PKC activation in the pathophysiology of a number of cardiovascular disease states. Few reports are available that examine PKC in normal and diseased human hearts. This review describes the structure, functions, and distribution of PKCs in the healthy and diseased heart with emphasis on the human heart and, also importantly, their regulation in heart failure.
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Affiliation(s)
- Raphael M Singh
- School of Forensic and Applied Sciences, University of Central Lancashire, Preston, England, PR1 2HE, UK.
- Faculty of Medicine and Health Sciences, University of Guyana, Turkeyen, Georgetown, Guyana.
| | - Emanuel Cummings
- Faculty of Medicine and Health Sciences, University of Guyana, Turkeyen, Georgetown, Guyana
| | - Constantinos Pantos
- Department of Pharmacology, School of Medicine, University of Athens, Athens, Greece
| | - Jaipaul Singh
- School of Forensic and Applied Sciences, University of Central Lancashire, Preston, England, PR1 2HE, UK
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31
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Staged ventricular recruitment in patients with borderline ventricles and large ventricular septal defects. J Thorac Cardiovasc Surg 2018; 156:254-264. [DOI: 10.1016/j.jtcvs.2018.03.111] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/29/2017] [Revised: 02/20/2018] [Accepted: 03/01/2018] [Indexed: 11/21/2022]
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32
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Tan SH, Ye L. Maturation of Pluripotent Stem Cell-Derived Cardiomyocytes: a Critical Step for Drug Development and Cell Therapy. J Cardiovasc Transl Res 2018; 11:375-392. [PMID: 29557052 DOI: 10.1007/s12265-018-9801-5] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/01/2018] [Accepted: 03/08/2018] [Indexed: 12/16/2022]
Abstract
Cardiomyocytes derived from human pluripotent stem cells (hPSCs) are emerging as an invaluable alternative to primarily sourced cardiomyocytes. The potentially unlimited number of hPSC-derived cardiomyocytes (hPSC-CMs) that may be obtained in vitro facilitates high-throughput applications like cell transplantation for myocardial repair, cardiotoxicity testing during drug development, and patient-specific disease modeling. Despite promising progress in these areas, a major disadvantage that limits the use of hPSC-CMs is their immaturity. Improvements to the maturity of hPSC-CMs are necessary to capture physiologically relevant responses. Herein, we review and discuss the different maturation strategies undertaken by others to improve the morphology, contractility, electrophysiology, and metabolism of these derived cardiomyocytes.
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Affiliation(s)
- Shi Hua Tan
- National Heart Research Institute Singapore, National Heart Centre Singapore, Singapore, 169609, Singapore
| | - Lei Ye
- National Heart Research Institute Singapore, National Heart Centre Singapore, Singapore, 169609, Singapore.
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Lewis YE, Moskovitz A, Mutlak M, Heineke J, Caspi LH, Kehat I. Localization of transcripts, translation, and degradation for spatiotemporal sarcomere maintenance. J Mol Cell Cardiol 2018; 116:16-28. [PMID: 29371135 DOI: 10.1016/j.yjmcc.2018.01.012] [Citation(s) in RCA: 38] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/06/2017] [Revised: 01/14/2018] [Accepted: 01/19/2018] [Indexed: 12/12/2022]
Abstract
The mechanisms responsible for maintaining macromolecular protein complexes, with their proper localization and subunit stoichiometry, are incompletely understood. Here we studied the maintenance of the sarcomere, the basic contractile macromolecular complex of cardiomyocytes. We performed single-cell analysis of cardiomyocytes using imaging of mRNA and protein synthesis, and demonstrate that three distinct mechanisms are responsible for the maintenance of the sarcomere: mRNAs encoding for sarcomeric proteins are localized to the sarcomere, ribosomes are localized to the sarcomere with localized sarcomeric protein translation, and finally, a localized E3 ubiquitin ligase allow efficient degradation of excess unincorporated sarcomeric proteins. We show that these mechanisms are distinct, required, and work in unison, to ensure both spatial localization, and to overcome the large variability in transcription. Cardiomyocytes simultaneously maintain all their sarcomeres using localized translation and degradation processes where proteins are continuously and locally synthesized at high rates, and excess proteins are continuously degraded.
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Affiliation(s)
- Yair E Lewis
- The Rappaport Institute and the Bruce Rappaport Faculty of Medicine, Technion - Israel Institute of Technology, Haifa 31096, Israel
| | - Anner Moskovitz
- The Rappaport Institute and the Bruce Rappaport Faculty of Medicine, Technion - Israel Institute of Technology, Haifa 31096, Israel
| | - Michael Mutlak
- The Rappaport Institute and the Bruce Rappaport Faculty of Medicine, Technion - Israel Institute of Technology, Haifa 31096, Israel
| | - Joerg Heineke
- Experimental Cardiology, Klinik für Kardiologie und Angiologie, Medizinische Hochschule Hannover, Germany
| | - Lilac H Caspi
- The Rappaport Institute and the Bruce Rappaport Faculty of Medicine, Technion - Israel Institute of Technology, Haifa 31096, Israel
| | - Izhak Kehat
- The Rappaport Institute and the Bruce Rappaport Faculty of Medicine, Technion - Israel Institute of Technology, Haifa 31096, Israel; Department of Cardiology and the Clinical Research Institute at Rambam, Rambam Medical Center, Haifa 31096, Israel.
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Gluck JM, Herren AW, Yechikov S, Kao HKJ, Khan A, Phinney BS, Chiamvimonvat N, Chan JW, Lieu DK. Biochemical and biomechanical properties of the pacemaking sinoatrial node extracellular matrix are distinct from contractile left ventricular matrix. PLoS One 2017; 12:e0185125. [PMID: 28934329 PMCID: PMC5608342 DOI: 10.1371/journal.pone.0185125] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2017] [Accepted: 09/05/2017] [Indexed: 11/30/2022] Open
Abstract
Extracellular matrix plays a role in differentiation and phenotype development of its resident cells. Although cardiac extracellular matrix from the contractile tissues has been studied and utilized in tissue engineering, extracellular matrix properties of the pacemaking sinoatrial node are largely unknown. In this study, the biomechanical properties and biochemical composition and distribution of extracellular matrix in the sinoatrial node were investigated relative to the left ventricle. Extracellular matrix of the sinoatrial node was found to be overall stiffer than that of the left ventricle and highly heterogeneous with interstitial regions composed of predominantly fibrillar collagens and rich in elastin. The extracellular matrix protein distribution suggests that resident pacemaking cardiomyocytes are enclosed in fibrillar collagens that can withstand greater tensile strength while the surrounding elastin-rich regions may undergo deformation to reduce the mechanical strain in these cells. Moreover, basement membrane-associated adhesion proteins that are ligands for integrins were of low abundance in the sinoatrial node, which may decrease force transduction in the pacemaking cardiomyocytes. In contrast to extracellular matrix of the left ventricle, extracellular matrix of the sinoatrial node may reduce mechanical strain and force transduction in pacemaking cardiomyocytes. These findings provide the criteria for a suitable matrix scaffold for engineering biopacemakers.
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Affiliation(s)
- Jessica M. Gluck
- Division of Cardiovascular Medicine, Department of Internal Medicine, University of California Davis; Davis, CA, United States of America
| | - Anthony W. Herren
- UC Davis Genome Center, University of California Davis; Davis, CA, United States of America
| | - Sergey Yechikov
- Division of Cardiovascular Medicine, Department of Internal Medicine, University of California Davis; Davis, CA, United States of America
| | - Hillary K. J. Kao
- Division of Cardiovascular Medicine, Department of Internal Medicine, University of California Davis; Davis, CA, United States of America
- Bridges to Stem Cell Research Program, California State University Sacramento; Sacramento, CA, United States of America
| | - Ambereen Khan
- Division of Cardiovascular Medicine, Department of Internal Medicine, University of California Davis; Davis, CA, United States of America
- Bridges to Stem Cell Research Program, California State University Sacramento; Sacramento, CA, United States of America
| | - Brett S. Phinney
- UC Davis Genome Center, University of California Davis; Davis, CA, United States of America
| | - Nipavan Chiamvimonvat
- Division of Cardiovascular Medicine, Department of Internal Medicine, University of California Davis; Davis, CA, United States of America
- Department of Veterans Affairs, Northern California Health Care System; Mather, CA, United States of America
| | - James W. Chan
- Center for Biophotonics, University of California Davis; Sacramento, CA, United States of America
- Department of Pathology and Laboratory Medicine, University of California Davis; Sacramento, CA, United States of America
| | - Deborah K. Lieu
- Division of Cardiovascular Medicine, Department of Internal Medicine, University of California Davis; Davis, CA, United States of America
- * E-mail:
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Patel MD, Mohan J, Schneider C, Bajpai G, Purevjav E, Canter CE, Towbin J, Bredemeyer A, Lavine KJ. Pediatric and adult dilated cardiomyopathy represent distinct pathological entities. JCI Insight 2017; 2:94382. [PMID: 28724792 DOI: 10.1172/jci.insight.94382] [Citation(s) in RCA: 45] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2017] [Accepted: 06/06/2017] [Indexed: 01/15/2023] Open
Abstract
Pediatric dilated cardiomyopathy (DCM) is the most common indication for heart transplantation in children. Despite similar genetic etiologies, medications routinely used in adult heart failure patients do not improve outcomes in the pediatric population. The mechanistic basis for these observations is unknown. We hypothesized that pediatric and adult DCM comprise distinct pathological entities, in that children do not undergo adverse remodeling, the target of adult heart failure therapies. To test this hypothesis, we examined LV specimens obtained from pediatric and adult donor controls and DCM patients. Consistent with the established pathophysiology of adult heart failure, adults with DCM displayed marked cardiomyocyte hypertrophy and myocardial fibrosis compared with donor controls. In contrast, pediatric DCM specimens demonstrated minimal cardiomyocyte hypertrophy and myocardial fibrosis compared with both age-matched controls and adults with DCM. Strikingly, RNA sequencing uncovered divergent gene expression profiles in pediatric and adult patients, including enrichment of transcripts associated with adverse remodeling and innate immune activation in adult DCM specimens. Collectively, these findings reveal that pediatric and adult DCM represent distinct pathological entities, provide a mechanistic basis to explain why children fail to respond to adult heart failure therapies, and suggest the need to develop new approaches for pediatric DCM.
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Affiliation(s)
| | - Jayaram Mohan
- Center for Cardiovascular Research, Division of Cardiology, Department of Medicine, Washington University School of Medicine, St. Louis, Missouri, USA
| | - Caralin Schneider
- Center for Cardiovascular Research, Division of Cardiology, Department of Medicine, Washington University School of Medicine, St. Louis, Missouri, USA
| | - Geetika Bajpai
- Center for Cardiovascular Research, Division of Cardiology, Department of Medicine, Washington University School of Medicine, St. Louis, Missouri, USA
| | - Enkhsaikhan Purevjav
- Department of Pediatrics, Division of Cardiology, University of Tennessee Health Science Center, Memphis, Tennessee, USA
| | | | - Jeffrey Towbin
- Department of Pediatrics, Division of Cardiology, University of Tennessee Health Science Center, Memphis, Tennessee, USA
| | - Andrea Bredemeyer
- Center for Cardiovascular Research, Division of Cardiology, Department of Medicine, Washington University School of Medicine, St. Louis, Missouri, USA
| | - Kory J Lavine
- Center for Cardiovascular Research, Division of Cardiology, Department of Medicine, Washington University School of Medicine, St. Louis, Missouri, USA.,Department of Developmental Biology, and.,Department of Immunology and Pathology, Washington University School of Medicine, St. Louis, Missouri, USA
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Galdos FX, Guo Y, Paige SL, VanDusen NJ, Wu SM, Pu WT. Cardiac Regeneration: Lessons From Development. Circ Res 2017; 120:941-959. [PMID: 28302741 DOI: 10.1161/circresaha.116.309040] [Citation(s) in RCA: 102] [Impact Index Per Article: 14.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/24/2016] [Revised: 12/14/2016] [Accepted: 12/15/2016] [Indexed: 02/06/2023]
Abstract
Palliative surgery for congenital heart disease has allowed patients with previously lethal heart malformations to survive and, in most cases, to thrive. However, these procedures often place pressure and volume loads on the heart, and over time, these chronic loads can cause heart failure. Current therapeutic options for initial surgery and chronic heart failure that results from failed palliation are limited, in part, by the mammalian heart's low inherent capacity to form new cardiomyocytes. Surmounting the heart regeneration barrier would transform the treatment of congenital, as well as acquired, heart disease and likewise would enable development of personalized, in vitro cardiac disease models. Although these remain distant goals, studies of heart development are illuminating the path forward and suggest unique opportunities for heart regeneration, particularly in fetal and neonatal periods. Here, we review major lessons from heart development that inform current and future studies directed at enhancing cardiac regeneration.
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Affiliation(s)
- Francisco X Galdos
- From the Cardiovascular Institute, School of Medicine, Stanford University, CA (F.X.G., S.L.P., S.M.W.); Department of Cardiology, Boston Children's Hospital, MA (Y.G., N.J.V., W.T.P.); Division of Pediatric Cardiology, Department of Pediatrics (S.L.P.), Division of Cardiovascular Medicine, Department of Medicine (S.M.W.), and Institute of Stem Cell and Regenerative Biology, School of Medicine, Stanford, CA (F.X.G., S.L.P., S.M.W.); and Harvard Stem Cell Institute, Harvard University, Cambridge, MA (W.T.P.)
| | - Yuxuan Guo
- From the Cardiovascular Institute, School of Medicine, Stanford University, CA (F.X.G., S.L.P., S.M.W.); Department of Cardiology, Boston Children's Hospital, MA (Y.G., N.J.V., W.T.P.); Division of Pediatric Cardiology, Department of Pediatrics (S.L.P.), Division of Cardiovascular Medicine, Department of Medicine (S.M.W.), and Institute of Stem Cell and Regenerative Biology, School of Medicine, Stanford, CA (F.X.G., S.L.P., S.M.W.); and Harvard Stem Cell Institute, Harvard University, Cambridge, MA (W.T.P.)
| | - Sharon L Paige
- From the Cardiovascular Institute, School of Medicine, Stanford University, CA (F.X.G., S.L.P., S.M.W.); Department of Cardiology, Boston Children's Hospital, MA (Y.G., N.J.V., W.T.P.); Division of Pediatric Cardiology, Department of Pediatrics (S.L.P.), Division of Cardiovascular Medicine, Department of Medicine (S.M.W.), and Institute of Stem Cell and Regenerative Biology, School of Medicine, Stanford, CA (F.X.G., S.L.P., S.M.W.); and Harvard Stem Cell Institute, Harvard University, Cambridge, MA (W.T.P.)
| | - Nathan J VanDusen
- From the Cardiovascular Institute, School of Medicine, Stanford University, CA (F.X.G., S.L.P., S.M.W.); Department of Cardiology, Boston Children's Hospital, MA (Y.G., N.J.V., W.T.P.); Division of Pediatric Cardiology, Department of Pediatrics (S.L.P.), Division of Cardiovascular Medicine, Department of Medicine (S.M.W.), and Institute of Stem Cell and Regenerative Biology, School of Medicine, Stanford, CA (F.X.G., S.L.P., S.M.W.); and Harvard Stem Cell Institute, Harvard University, Cambridge, MA (W.T.P.)
| | - Sean M Wu
- From the Cardiovascular Institute, School of Medicine, Stanford University, CA (F.X.G., S.L.P., S.M.W.); Department of Cardiology, Boston Children's Hospital, MA (Y.G., N.J.V., W.T.P.); Division of Pediatric Cardiology, Department of Pediatrics (S.L.P.), Division of Cardiovascular Medicine, Department of Medicine (S.M.W.), and Institute of Stem Cell and Regenerative Biology, School of Medicine, Stanford, CA (F.X.G., S.L.P., S.M.W.); and Harvard Stem Cell Institute, Harvard University, Cambridge, MA (W.T.P.).
| | - William T Pu
- From the Cardiovascular Institute, School of Medicine, Stanford University, CA (F.X.G., S.L.P., S.M.W.); Department of Cardiology, Boston Children's Hospital, MA (Y.G., N.J.V., W.T.P.); Division of Pediatric Cardiology, Department of Pediatrics (S.L.P.), Division of Cardiovascular Medicine, Department of Medicine (S.M.W.), and Institute of Stem Cell and Regenerative Biology, School of Medicine, Stanford, CA (F.X.G., S.L.P., S.M.W.); and Harvard Stem Cell Institute, Harvard University, Cambridge, MA (W.T.P.).
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Dewan S, Krishnamurthy A, Kole D, Conca G, Kerckhoffs R, Puchalski MD, Omens JH, Sun H, Nigam V, McCulloch AD. Model of Human Fetal Growth in Hypoplastic Left Heart Syndrome: Reduced Ventricular Growth Due to Decreased Ventricular Filling and Altered Shape. Front Pediatr 2017; 5:25. [PMID: 28275592 PMCID: PMC5319967 DOI: 10.3389/fped.2017.00025] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/02/2016] [Accepted: 02/01/2017] [Indexed: 02/02/2023] Open
Abstract
INTRODUCTION Hypoplastic left heart syndrome (HLHS) is a congenital condition with an underdeveloped left ventricle (LV) that provides inadequate systemic blood flow postnatally. The development of HLHS is postulated to be due to altered biomechanical stimuli during gestation. Predicting LV size at birth using mid-gestation fetal echocardiography is a clinical challenge critical to prognostic counseling. HYPOTHESIS We hypothesized that decreased ventricular filling in utero due to mitral stenosis may reduce LV growth in the fetal heart via mechanical growth signaling. METHODS We developed a novel finite element model of the human fetal heart in which cardiac myocyte growth rates are a function of fiber and cross-fiber strains, which is affected by altered ventricular filling, to simulate alterations in LV growth and remodeling. Model results were tested with echocardiogram measurements from normal and HLHS fetal hearts. RESULTS A strain-based fetal growth model with a normal 22-week ventricular filling (1.04 mL) was able to replicate published measurements of changes between mid-gestation to birth of mean LV end-diastolic volume (EDV) (1.1-8.3 mL) and dimensions (long-axis, 18-35 mm; short-axis, 9-18 mm) within 15% root mean squared deviation error. By decreasing volumetric load (-25%) at mid-gestation in the model, which emulates mitral stenosis in utero, a 65% reduction in LV EDV and a 46% reduction in LV wall volume were predicted at birth, similar to observations in HLHS patients. In retrospective blinded case studies for HLHS, using mid-gestation echocardiographic data, the model predicted a borderline and severe hypoplastic LV, consistent with the patients' late-gestation data in both cases. Notably, the model prediction was validated by testing for changes in LV shape in the model against clinical data for each HLHS case study. CONCLUSION Reduced ventricular filling and altered shape may lead to reduced LV growth and a hypoplastic phenotype by reducing myocardial strains that serve as a myocyte growth stimulus. The human fetal growth model presented here may lead to a clinical tool that can help predict LV size and shape at birth based on mid-gestation LV echocardiographic measurements.
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Affiliation(s)
- Sukriti Dewan
- Department of Bioengineering, University of California at San Diego , La Jolla, CA , USA
| | - Adarsh Krishnamurthy
- Department of Bioengineering, University of California at San Diego, La Jolla, CA, USA; Department of Mechanical Engineering, Iowa State University, Ames, IA, USA
| | - Devleena Kole
- Department of Bioengineering, University of California at San Diego , La Jolla, CA , USA
| | - Giulia Conca
- Department of Bioengineering, University of California at San Diego , La Jolla, CA , USA
| | - Roy Kerckhoffs
- Department of Bioengineering, University of California at San Diego , La Jolla, CA , USA
| | - Michael D Puchalski
- Pediatric Cardiology, Primary Children's Hospital, University of Utah , Salt Lake City, UT , USA
| | - Jeffrey H Omens
- Department of Bioengineering, University of California at San Diego, La Jolla, CA, USA; Department of Medicine, University of California at San Diego, La Jolla, CA, USA
| | - Heather Sun
- Pediatric Cardiology, Rady Children's Hospital, University of California at San Diego , San Diego, CA , USA
| | - Vishal Nigam
- Pediatric Cardiology, Rady Children's Hospital, University of California at San Diego , San Diego, CA , USA
| | - Andrew D McCulloch
- Department of Bioengineering, University of California at San Diego, La Jolla, CA, USA; Department of Medicine, University of California at San Diego, La Jolla, CA, USA
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Islam YFK, Joseph R, Chowdhury RR, Anderson RH, Kasahara H. Heart Failure Induced by Perinatal Ablation of Cardiac Myosin Light Chain Kinase. Front Physiol 2016; 7:480. [PMID: 27833563 PMCID: PMC5080352 DOI: 10.3389/fphys.2016.00480] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2016] [Accepted: 10/05/2016] [Indexed: 12/16/2022] Open
Abstract
Background: Germline knockout mice are invaluable in understanding the function of the targeted genes. Sometimes, however, unexpected phenotypes are encountered, due in part to the activation of compensatory mechanisms. Germline ablation of cardiac myosin light chain kinase (cMLCK) causes mild cardiac dysfunction with cardiomyocyte hypertrophy, whereas ablation in adult hearts results in acute heart failure with cardiomyocyte atrophy. We hypothesized that compensation after ablation of cMLCK is dependent on developmental staging and perinatal-onset of cMLCK ablation will result in more evident heart failure than germline ablation, but less profound when compared to adult-onset ablation. Methods and Results: The floxed-Mylk3 gene was ablated at the beginning of the perinatal stage using a single intra-peritoneal tamoxifen injection of 50 mg/kg into pregnant mice on the 19th day of gestation, this being the final day of gestation. The level of cMLCK protein level could no longer be detected 3 days after the injection, with these mice hereafter denoted as the perinatal Mylk3-KO. At postnatal day 19, shortly before weaning age, these mice showed reduced cardiac contractility with a fractional shortening 22.8 ± 1.0% (n = 7) as opposed to 31.4 ± 1.0% (n = 11) in controls. The ratio of the heart weight relative to body weight was significantly increased at 6.68 ± 0.28 mg/g (n = 12) relative to the two control groups, 5.90 ± 0.16 (flox/flox, n = 11) and 5.81 ± 0.33 (wild/wild/Cre, n = 5), accompanied by reduced body weight. Furthermore, their cardiomyocytes were elongated without thickening, with a long-axis of 101.8 ± 2.4 μm (n = 320) as opposed to 87.1 ± 1.6 μm (n = 360) in the controls. Conclusion: Perinatal ablation of cMLCK produces an increase of heart weight/body weight ratio, a reduction of contractility, and an increase in the expression of fetal genes. The perinatal Mylk3-KO cardiomyocytes were elongated in the absence of thickening, differing from the compensatory hypertrophy shown in the germline knockout, and the cardomyocyte thinning shown in adult-inducible knockout.
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Affiliation(s)
- Yasmin F K Islam
- Department of Physiology and Functional Genomics, University of Florida Gainesville, FL, USA
| | - Ryan Joseph
- Department of Physiology and Functional Genomics, University of Florida Gainesville, FL, USA
| | - Rajib R Chowdhury
- Department of Physiology and Functional Genomics, University of Florida Gainesville, FL, USA
| | | | - Hideko Kasahara
- Department of Physiology and Functional Genomics, University of Florida Gainesville, FL, USA
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Broughton KM, Li J, Sarmah E, Warren CM, Lin YH, Henze MP, Sanchez-Freire V, Solaro RJ, Russell B. A myosin activator improves actin assembly and sarcomere function of human-induced pluripotent stem cell-derived cardiomyocytes with a troponin T point mutation. Am J Physiol Heart Circ Physiol 2016; 311:H107-17. [PMID: 27199119 DOI: 10.1152/ajpheart.00162.2016] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/23/2016] [Accepted: 05/02/2016] [Indexed: 11/22/2022]
Abstract
We have investigated cardiac myocytes derived from human-induced pluripotent stem cells (iPSC-CMs) from two normal control and two family members expressing a mutant cardiac troponin T (cTnT-R173W) linked to dilated cardiomyopathy (DCM). cTnT is a regulatory protein of the sarcomeric thin filament. The loss of this basic charge, which is strategically located to control tension, has consequences leading to progressive DCM. iPSC-CMs serve as a valuable platform for understanding clinically relevant mutations in sarcomeric proteins; however, there are important questions to be addressed with regard to myocyte adaptation that we model here by plating iPSC-CMs on softer substrates (100 kPa) to create a more physiologic environment during recovery and maturation of iPSC-CMs after thawing from cryopreservation. During the first week of culture of the iPSC-CMs, we have determined structural and functional characteristics as well as actin assembly dynamics. Shortening, actin content, and actin assembly dynamics were depressed in CMs from the severely affected mutant at 1 wk of culture, but by 2 wk differences were less apparent. Sarcomeric troponin and myosin isoform composition were fetal/neonatal. Furthermore, the troponin complex, reconstituted with wild-type cTnT or recombinant cTnT-R173W, depressed the entry of cross-bridges into the force-generating state, which can be reversed by the myosin activator omecamtiv mecarbil. Therapeutic doses of this drug increased both contractility and the content of F-actin in the mutant iPSC-CMs. Collectively, our data suggest the use of a myosin activation reagent to restore function within patient-specific iPSC-CMs may aid in understanding and treating this familial DCM.
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Affiliation(s)
- K M Broughton
- Department of Bioengineering, University of Illinois at Chicago, Chicago, Illinois
| | - J Li
- Department of Physiology and Biophysics, University of Illinois at Chicago, Chicago, Illinois; and
| | - E Sarmah
- Department of Bioengineering, University of Illinois at Chicago, Chicago, Illinois
| | - C M Warren
- Department of Physiology and Biophysics, University of Illinois at Chicago, Chicago, Illinois; and
| | - Y-H Lin
- Department of Physiology and Biophysics, University of Illinois at Chicago, Chicago, Illinois; and
| | - M P Henze
- Department of Physiology and Biophysics, University of Illinois at Chicago, Chicago, Illinois; and
| | - V Sanchez-Freire
- Department of Medicine, Division of Cardiology, Stanford University School of Medicine, Stanford, California
| | - R J Solaro
- Department of Physiology and Biophysics, University of Illinois at Chicago, Chicago, Illinois; and
| | - B Russell
- Department of Physiology and Biophysics, University of Illinois at Chicago, Chicago, Illinois; and
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Massengill MT, Ashraf HM, Chowdhury RR, Chrzanowski SM, Kar J, Warren SA, Walter GA, Zeng H, Kang BH, Anderson RH, Moss RL, Kasahara H. Acute heart failure with cardiomyocyte atrophy induced in adult mice by ablation of cardiac myosin light chain kinase. Cardiovasc Res 2016; 111:34-43. [PMID: 27025239 DOI: 10.1093/cvr/cvw069] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/31/2015] [Accepted: 03/17/2016] [Indexed: 12/31/2022] Open
Abstract
AIMS Under pressure overload, initial adaptive hypertrophy of the heart is followed by cardiomyocyte elongation, reduced contractile force, and failure. The mechanisms governing the transition to failure are not fully understood. Pressure overload reduced cardiac myosin light chain kinase (cMLCK) by ∼80% within 1 week and persists. Knockdown of cMLCK in cardiomyocytes resulted in reduced cardiac contractility and sarcomere disorganization. Thus, we hypothesized that acute reduction of cMLCK may be causative for reduced contractility and cardiomyocyte remodelling during the transition from compensated to decompensated cardiac hypertrophy. METHODS AND RESULTS To mimic acute cMLCK reduction in adult hearts, the floxed-Mylk3 gene that encodes cMLCK was inducibly ablated in Mylk3(flox/flox)/merCremer mice (Mylk3-KO), and compared with two control mice (Mylk3(flox/flox) and Mylk3(+/+)/merCremer) following tamoxifen injection (50 mg/kg/day, 2 consecutive days). In Mylk3-KO mice, reduction of cMLCK protein was evident by 4 days, with a decline to below the level of detection by 6 days. By 7 days, these mice exhibited heart failure, with reduction of fractional shortening compared with those in two control groups (19.8 vs. 28.0% and 27.7%). Severely convoluted cardiomyocytes with sarcomeric disorganization, wavy fibres, and cell death were demonstrated in Mylk3-KO mice. The cardiomyocytes were also unable to thicken adaptively to pressure overload. CONCLUSION Our results, using a new mouse model mimicking an acute reduction of cMLCK, suggest that cMLCK plays a pivotal role in the transition from compensated to decompensated hypertrophy via sarcomeric disorganization.
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Affiliation(s)
- Michael T Massengill
- Department of Physiology and Functional Genomics, University of Florida College of Medicine, 1600 SW Archer Rd, M543, Gainesville, FL 32610-0274, USA
| | - Hassan M Ashraf
- Department of Physiology and Functional Genomics, University of Florida College of Medicine, 1600 SW Archer Rd, M543, Gainesville, FL 32610-0274, USA
| | - Rajib R Chowdhury
- Department of Physiology and Functional Genomics, University of Florida College of Medicine, 1600 SW Archer Rd, M543, Gainesville, FL 32610-0274, USA
| | - Stephen M Chrzanowski
- Department of Physiology and Functional Genomics, University of Florida College of Medicine, 1600 SW Archer Rd, M543, Gainesville, FL 32610-0274, USA
| | - Jeena Kar
- Department of Physiology and Functional Genomics, University of Florida College of Medicine, 1600 SW Archer Rd, M543, Gainesville, FL 32610-0274, USA
| | - Sonisha A Warren
- Department of Physiology and Functional Genomics, University of Florida College of Medicine, 1600 SW Archer Rd, M543, Gainesville, FL 32610-0274, USA
| | - Glenn A Walter
- Department of Physiology and Functional Genomics, University of Florida College of Medicine, 1600 SW Archer Rd, M543, Gainesville, FL 32610-0274, USA
| | - Huadong Zeng
- Advanced Magnetic Resonance Imaging and Spectroscopy Facility, University of Florida, Gainesville, FL, USA
| | - Byung-Ho Kang
- Electron Microscopy and Bio-imaging Laboratory, University of Florida, Gainesville, FL, USA
| | | | - Richard L Moss
- Department of Cell and Regenerative Biology, University of Wisconsin School of Medicine and Public Health, Madison, WI 53706, USA
| | - Hideko Kasahara
- Department of Physiology and Functional Genomics, University of Florida College of Medicine, 1600 SW Archer Rd, M543, Gainesville, FL 32610-0274, USA
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Yang H, Schmidt LP, Wang Z, Yang X, Shao Y, Borg TK, Markwald R, Runyan R, Gao BZ. Dynamic Myofibrillar Remodeling in Live Cardiomyocytes under Static Stretch. Sci Rep 2016; 6:20674. [PMID: 26861590 PMCID: PMC4748238 DOI: 10.1038/srep20674] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2015] [Accepted: 01/11/2016] [Indexed: 12/21/2022] Open
Abstract
An increase in mechanical load in the heart causes cardiac hypertrophy, either physiologically (heart development, exercise and pregnancy) or pathologically (high blood pressure and heart-valve regurgitation). Understanding cardiac hypertrophy is critical to comprehending the mechanisms of heart development and treatment of heart disease. However, the major molecular event that occurs during physiological or pathological hypertrophy is the dynamic process of sarcomeric addition, and it has not been observed. In this study, a custom-built second harmonic generation (SHG) confocal microscope was used to study dynamic sarcomeric addition in single neonatal CMs in a 3D culture system under acute, uniaxial, static, sustained stretch. Here we report, for the first time, live-cell observations of various modes of dynamic sarcomeric addition (and how these real-time images compare to static images from hypertrophic hearts reported in the literature): 1) Insertion in the mid-region or addition at the end of a myofibril; 2) Sequential addition with an existing myofibril as a template; and 3) Longitudinal splitting of an existing myofibril. The 3D cell culture system developed on a deformable substrate affixed to a stretcher and the SHG live-cell imaging technique are unique tools for real-time analysis of cultured models of hypertrophy.
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Affiliation(s)
- Huaxiao Yang
- Department of Bioengineering, Clemson University, Clemson, SC, USA
| | - Lucas P Schmidt
- Department of Bioengineering, Clemson University, Clemson, SC, USA
| | - Zhonghai Wang
- Department of Bioengineering, Clemson University, Clemson, SC, USA
| | - Xiaoqi Yang
- Department of Bioengineering, Clemson University, Clemson, SC, USA
| | - Yonghong Shao
- Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Optoelectronic Engineering, Shenzhen University, Shenzhen, China
| | - Thomas K Borg
- Department of Regenerative Medicine and Cell Biology, Medical University of South Carolina, Charleston, SC, USA
| | - Roger Markwald
- Department of Regenerative Medicine and Cell Biology, Medical University of South Carolina, Charleston, SC, USA
| | - Raymond Runyan
- Department of Cellular and Molecular Medicine, University of Arizona, Tucson, AZ, USA
| | - Bruce Z Gao
- Department of Bioengineering, Clemson University, Clemson, SC, USA
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Ma SP, Vunjak-Novakovic G. Tissue-Engineering for the Study of Cardiac Biomechanics. J Biomech Eng 2016; 138:021010. [PMID: 26720588 PMCID: PMC4845250 DOI: 10.1115/1.4032355] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2015] [Indexed: 12/13/2022]
Abstract
The notion that both adaptive and maladaptive cardiac remodeling occurs in response to mechanical loading has informed recent progress in cardiac tissue engineering. Today, human cardiac tissues engineered in vitro offer complementary knowledge to that currently provided by animal models, with profound implications to personalized medicine. We review here recent advances in the understanding of the roles of mechanical signals in normal and pathological cardiac function, and their application in clinical translation of tissue engineering strategies to regenerative medicine and in vitro study of disease.
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Affiliation(s)
- Stephen P. Ma
- Department of Biomedical Engineering,
Columbia University,
622 West 168th Street,
VC12-234,
New York, NY 10032
e-mail:
| | - Gordana Vunjak-Novakovic
- Department of Biomedical Engineering
and Department of Medicine,
Columbia University,
622 West 168th Street,
VC12-234,
New York, NY 10032
e-mail:
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Capulli AK, MacQueen LA, Sheehy SP, Parker KK. Fibrous scaffolds for building hearts and heart parts. Adv Drug Deliv Rev 2016; 96:83-102. [PMID: 26656602 PMCID: PMC4807693 DOI: 10.1016/j.addr.2015.11.020] [Citation(s) in RCA: 84] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2015] [Revised: 11/24/2015] [Accepted: 11/26/2015] [Indexed: 12/14/2022]
Abstract
Extracellular matrix (ECM) structure and biochemistry provide cell-instructive cues that promote and regulate tissue growth, function, and repair. From a structural perspective, the ECM is a scaffold that guides the self-assembly of cells into distinct functional tissues. The ECM promotes the interaction between individual cells and between different cell types, and increases the strength and resilience of the tissue in mechanically dynamic environments. From a biochemical perspective, factors regulating cell-ECM adhesion have been described and diverse aspects of cell-ECM interactions in health and disease continue to be clarified. Natural ECMs therefore provide excellent design rules for tissue engineering scaffolds. The design of regenerative three-dimensional (3D) engineered scaffolds is informed by the target ECM structure, chemistry, and mechanics, to encourage cell infiltration and tissue genesis. This can be achieved using nanofibrous scaffolds composed of polymers that simultaneously recapitulate 3D ECM architecture, high-fidelity nanoscale topography, and bio-activity. Their high porosity, structural anisotropy, and bio-activity present unique advantages for engineering 3D anisotropic tissues. Here, we use the heart as a case study and examine the potential of ECM-inspired nanofibrous scaffolds for cardiac tissue engineering. We asked: Do we know enough to build a heart? To answer this question, we tabulated structural and functional properties of myocardial and valvular tissues for use as design criteria, reviewed nanofiber manufacturing platforms and assessed their capabilities to produce scaffolds that meet our design criteria. Our knowledge of the anatomy and physiology of the heart, as well as our ability to create synthetic ECM scaffolds have advanced to the point that valve replacement with nanofibrous scaffolds may be achieved in the short term, while myocardial repair requires further study in vitro and in vivo.
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Affiliation(s)
- A K Capulli
- Disease Biophysics Group, Wyss Institute for Biologically Inspired Engineering, John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, USA
| | - L A MacQueen
- Disease Biophysics Group, Wyss Institute for Biologically Inspired Engineering, John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, USA
| | - Sean P Sheehy
- Disease Biophysics Group, Wyss Institute for Biologically Inspired Engineering, John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, USA
| | - K K Parker
- Disease Biophysics Group, Wyss Institute for Biologically Inspired Engineering, John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, USA.
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Pilarczyk G, Raulf A, Gunkel M, Fleischmann BK, Lemor R, Hausmann M. Tissue-Mimicking Geometrical Constraints Stimulate Tissue-Like Constitution and Activity of Mouse Neonatal and Human-Induced Pluripotent Stem Cell-Derived Cardiac Myocytes. J Funct Biomater 2016; 7:E1. [PMID: 26751484 PMCID: PMC4810060 DOI: 10.3390/jfb7010001] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2015] [Revised: 12/17/2015] [Accepted: 12/18/2015] [Indexed: 12/15/2022] Open
Abstract
The present work addresses the question of to what extent a geometrical support acts as a physiological determining template in the setup of artificial cardiac tissue. Surface patterns with alternating concave to convex transitions of cell size dimensions were used to organize and orientate human-induced pluripotent stem cell (hIPSC)-derived cardiac myocytes and mouse neonatal cardiac myocytes. The shape of the cells, as well as the organization of the contractile apparatus recapitulates the anisotropic line pattern geometry being derived from tissue geometry motives. The intracellular organization of the contractile apparatus and the cell coupling via gap junctions of cell assemblies growing in a random or organized pattern were examined. Cell spatial and temporal coordinated excitation and contraction has been compared on plain and patterned substrates. While the α-actinin cytoskeletal organization is comparable to terminally-developed native ventricular tissue, connexin-43 expression does not recapitulate gap junction distribution of heart muscle tissue. However, coordinated contractions could be observed. The results of tissue-like cell ensemble organization open new insights into geometry-dependent cell organization, the cultivation of artificial heart tissue from stem cells and the anisotropy-dependent activity of therapeutic compounds.
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Affiliation(s)
- Götz Pilarczyk
- Kirchhoff Institute für Physik, Im Neuenheimer Feld INF 270, Heidelberg D-69120, Germany.
| | - Alexandra Raulf
- Institut für Physiologie der Unversität Bonn, Life & Brain Center, Sigmund Freud Strasse 25, Bonn D-53127, Germany.
| | - Manuel Gunkel
- ViroQuant Cell Networks RNAi Screening Facility, BioQuant Center, Im Neuenheimer Feld INF 267, Heidelberg D-69120, Germany.
| | - Bernd K Fleischmann
- Institut für Physiologie der Unversität Bonn, Life & Brain Center, Sigmund Freud Strasse 25, Bonn D-53127, Germany.
| | - Robert Lemor
- Luxembourg Institute for Science and Technology, 5 avenue des Hauts-Fourneaux, Esch-Belval L-4362, Luxembourg.
| | - Michael Hausmann
- Kirchhoff Institute für Physik, Im Neuenheimer Feld INF 270, Heidelberg D-69120, Germany.
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45
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Katz AM, Rolett EL. Heart failure: when form fails to follow function. Eur Heart J 2015; 37:449-54. [PMID: 26497163 DOI: 10.1093/eurheartj/ehv548] [Citation(s) in RCA: 84] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/17/2015] [Accepted: 09/23/2015] [Indexed: 12/16/2022] Open
Abstract
Cardiac performance is normally determined by architectural, cellular, and molecular structures that determine the heart's form, and by physiological and biochemical mechanisms that regulate the function of these structures. Impaired adaptation of form to function in failing hearts contributes to two syndromes initially called systolic heart failure (SHF) and diastolic heart failure (DHF). In SHF, characterized by high end-diastolic volume (EDV), the left ventricle (LV) cannot eject a normal stroke volume (SV); in DHF, with normal or low EDV, the LV cannot accept a normal venous return. These syndromes are now generally defined in terms of ejection fraction (EF): SHF became 'heart failure with reduced ejection fraction' (HFrEF) while DHF became 'heart failure with normal or preserved ejection fraction' (HFnEF or HFpEF). However, EF is a chimeric index because it is the ratio between SV--which measures function, and EDV--which measures form. In SHF the LV dilates when sarcomere addition in series increases cardiac myocyte length, whereas sarcomere addition in parallel can cause concentric hypertrophy in DHF by increasing myocyte thickness. Although dilatation in SHF allows the LV to accept a greater venous return, it increases the energy cost of ejection and initiates a vicious cycle that contributes to progressive dilatation. In contrast, concentric hypertrophy in DHF facilitates ejection but impairs filling and can cause heart muscle to deteriorate. Differences in the molecular signals that initiate dilatation and concentric hypertrophy can explain why many drugs that improve prognosis in SHF have little if any benefit in DHF.
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Affiliation(s)
- Arnold M Katz
- Geisel School of Medicine at Dartmouth, Hanover, NH, USA University of Connecticut School of Medicine, Farmington, CT, USA
| | - Ellis L Rolett
- Geisel School of Medicine at Dartmouth, Hanover, NH, USA Section of Cardiology, Dartmouth-Hitchcock Medical Center, One Medical Center Drive, Lebanon, NH 03756, USA
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46
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Steinberg SF. Mechanisms for redox-regulation of protein kinase C. Front Pharmacol 2015; 6:128. [PMID: 26157389 PMCID: PMC4477140 DOI: 10.3389/fphar.2015.00128] [Citation(s) in RCA: 72] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2015] [Accepted: 06/10/2015] [Indexed: 11/21/2022] Open
Abstract
Protein kinase C (PKC) is comprised of a family of signal-regulated enzymes that play pleiotropic roles in the control of many physiological and pathological responses. PKC isoforms are traditionally viewed as allosterically activated enzymes that are recruited to membranes by growth factor receptor-generated lipid cofactors. An inherent assumption of this conventional model of PKC isoform activation is that PKCs act exclusively at membrane-delimited substrates and that PKC catalytic activity is an inherent property of each enzyme that is not altered by the activation process. This traditional model of PKC activation does not adequately explain the many well-documented actions of PKC enzymes in mitochondrial, nuclear, and cardiac sarcomeric (non-sarcolemmal) subcellular compartments. Recent studies address this dilemma by identifying stimulus-specific differences in the mechanisms for PKC isoform activation during growth factor activation versus oxidative stress. This review discusses a number of non-canonical redox-triggered mechanisms that can alter the catalytic properties and subcellular compartmentation patterns of PKC enzymes. While some redox-activated mechanisms act at structural determinants that are common to all PKCs, the redox-dependent mechanism for PKCδ activation requires Src-dependent tyrosine phosphorylation of a unique phosphorylation motif on this enzyme and is isoform specific. Since oxidative stress contributes to pathogenesis of a wide range of clinical disorders, these stimulus-specific differences in the controls and consequences of PKC activation have important implications for the design and evaluation of PKC-targeted therapeutics.
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Affiliation(s)
- Susan F Steinberg
- Department of Pharmacology, College of Physicians and Surgeons, Columbia University New York, NY, USA
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Ibrahim A, Hage CH, Souissi A, Leray A, Héliot L, Souissi S, Vandenbunder B. Label-free microscopy and stress responses reveal the functional organization of Pseudodiaptomus marinus copepod myofibrils. J Struct Biol 2015; 191:224-35. [PMID: 26057347 DOI: 10.1016/j.jsb.2015.06.004] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2015] [Revised: 05/28/2015] [Accepted: 06/05/2015] [Indexed: 01/25/2023]
Abstract
Pseudodiaptomus marinus copepods are small crustaceans living in estuarine areas endowed with exceptional swimming and adaptative performances. Since the external cuticle acts as an impermeable barrier for most dyes and molecular tools for labeling copepod proteins with fluorescent tags are not available, imaging cellular organelles in these organisms requires label free microscopy. Complementary nonlinear microscopy techniques have been used to investigate the structure and the response of their myofibrils to abrupt changes of temperature or/and salinity. In contrast with previous observations in vertebrates and invertebrates, the flavin autofluorescence which is a signature of mitochondria activity and the Coherent Anti-Stokes Raman Scattering (CARS) pattern assigned to T-tubules overlapped along myofibrils with the second harmonic generation (SHG) striated pattern generated by myosin tails in sarcomeric A bands. Temperature jumps from 18 to 4 °C or salinity jumps from 30 to 15 psu mostly affected flavin autofluorescence. Severe salinity jumps from 30 to 0 psu dismantled myofibril organization with major changes both in the SHG and CARS patterns. After a double stress (from 18 °C/30 psu to 4° C/0 psu) condensed and distended regions appeared within single myofibrils, with flavin autofluorescence bands located between sarcomeric A bands. These results shed light on the interactions between the different functional compartments which provide fast acting excitation-contraction coupling and adequate power supply in copepods muscles.
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Affiliation(s)
- Ali Ibrahim
- Interdisciplinary Research Institute, USR 3078 CNRS, University of Lille - Parc scientifique de la Haute Borne, 59650 Villeneuve d'Ascq, France; Laboratoire d'Océanologie et de Géosciences, UMR CNRS 8187 LOG, University of Lille, Station Marine de Wimereux, 28 Avenue Foch, 62930 Wimereux, France.
| | - Charles Henri Hage
- Interdisciplinary Research Institute, USR 3078 CNRS, University of Lille - Parc scientifique de la Haute Borne, 59650 Villeneuve d'Ascq, France.
| | - Anissa Souissi
- Laboratoire d'Océanologie et de Géosciences, UMR CNRS 8187 LOG, University of Lille, Station Marine de Wimereux, 28 Avenue Foch, 62930 Wimereux, France.
| | - Aymeric Leray
- Interdisciplinary Research Institute, USR 3078 CNRS, University of Lille - Parc scientifique de la Haute Borne, 59650 Villeneuve d'Ascq, France.
| | - Laurent Héliot
- Interdisciplinary Research Institute, USR 3078 CNRS, University of Lille - Parc scientifique de la Haute Borne, 59650 Villeneuve d'Ascq, France.
| | - Sami Souissi
- Laboratoire d'Océanologie et de Géosciences, UMR CNRS 8187 LOG, University of Lille, Station Marine de Wimereux, 28 Avenue Foch, 62930 Wimereux, France.
| | - Bernard Vandenbunder
- Interdisciplinary Research Institute, USR 3078 CNRS, University of Lille - Parc scientifique de la Haute Borne, 59650 Villeneuve d'Ascq, France.
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48
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Yang J, Shih YH, Xu X. Understanding cardiac sarcomere assembly with zebrafish genetics. Anat Rec (Hoboken) 2015; 297:1681-93. [PMID: 25125181 DOI: 10.1002/ar.22975] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2014] [Revised: 05/12/2014] [Accepted: 05/13/2014] [Indexed: 01/06/2023]
Abstract
Mutations in sarcomere genes have been found in many inheritable human diseases, including hypertrophic cardiomyopathy. Elucidating the molecular mechanisms of sarcomere assembly shall facilitate understanding of the pathogenesis of sarcomere-based cardiac disease. Recently, biochemical and genomic studies have identified many new genes encoding proteins that localize to the sarcomere. However, their precise functions in sarcomere assembly and sarcomere-based cardiac disease are unknown. Here, we review zebrafish as an emerging vertebrate model for these studies. We summarize the techniques offered by this animal model to manipulate genes of interest, annotate gene expression, and describe the resulting phenotypes. We survey the sarcomere genes that have been investigated in zebrafish and discuss the potential of applying this in vivo model for larger-scale genetic studies.
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Affiliation(s)
- Jingchun Yang
- Department of Biochemistry and Molecular Biology, Mayo Clinic College of Medicine, Rochester, Minnesota; Division of Cardiovascular Diseases, Mayo Clinic College of Medicine, Rochester, Minnesota
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Mlih M, Host L, Martin S, Niederhoffer N, Monassier L, Terrand J, Messaddeq N, Radke M, Gotthardt M, Bruban V, Kober F, Bernard M, Canet-Soulas E, Abt-Jijon F, Boucher P, Matz RL. The Src homology and collagen A (ShcA) adaptor protein is required for the spatial organization of the costamere/Z-disk network during heart development. J Biol Chem 2014; 290:2419-30. [PMID: 25488665 DOI: 10.1074/jbc.m114.597377] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Src homology and collagen A (ShcA) is an adaptor protein that binds to tyrosine kinase receptors. Its germ line deletion is embryonic lethal with abnormal cardiovascular system formation, and its role in cardiovascular development is unknown. To investigate its functional role in cardiovascular development in mice, ShcA was deleted in cardiomyocytes and vascular smooth muscle cells by crossing ShcA flox mice with SM22a-Cre transgenic mice. Conditional mutant mice developed signs of severe dilated cardiomyopathy, myocardial infarctions, and premature death. No evidence of a vascular contribution to the phenotype was observed. Histological analysis of the heart revealed aberrant sarcomeric Z-disk and M-band structures, and misalignments of T-tubules with Z-disks. We find that not only the ErbB3/Neuregulin signaling pathway but also the baroreceptor reflex response, which have been functionally associated, are altered in the mutant mice. We further demonstrate that ShcA interacts with Caveolin-1 and the costameric protein plasma membrane Ca(2+)/calmodulin-dependent ATPase (PMCA), and that its deletion leads to abnormal dystrophin signaling. Collectively, these results demonstrate that ShcA interacts with crucial proteins and pathways that link Z-disk and costamere.
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Affiliation(s)
- Mohamed Mlih
- From the CNRS, UMR 7213, University of Strasbourg, 67401 Illkirch, France
| | - Lionel Host
- From the CNRS, UMR 7213, University of Strasbourg, 67401 Illkirch, France
| | - Sophie Martin
- From the CNRS, UMR 7213, University of Strasbourg, 67401 Illkirch, France
| | - Nathalie Niederhoffer
- the Laboratory of Neurobiology and Cardiovascular Pharmacology Department, EA 7296, Federation of Translational Medicine, University of Strasbourg, 67000 Strasbourg, France
| | - Laurent Monassier
- the Laboratory of Neurobiology and Cardiovascular Pharmacology Department, EA 7296, Federation of Translational Medicine, University of Strasbourg, 67000 Strasbourg, France
| | - Jérôme Terrand
- From the CNRS, UMR 7213, University of Strasbourg, 67401 Illkirch, France
| | - Nadia Messaddeq
- the IGBMC, INSERM U964 CNRS UMR 7104, University of Strasbourg, 67401 Illkirch, France
| | - Michael Radke
- the Neuromuscular and Cardiovascular Cell Biology, Max-Delbrück-Center for Molecular Medicine, 13125 Berlin, Germany, the DZHK, German Centre for Cardiovascular Research, partner site, 13347 Berlin, Germany
| | - Michael Gotthardt
- the Neuromuscular and Cardiovascular Cell Biology, Max-Delbrück-Center for Molecular Medicine, 13125 Berlin, Germany, the DZHK, German Centre for Cardiovascular Research, partner site, 13347 Berlin, Germany
| | - Véronique Bruban
- From the CNRS, UMR 7213, University of Strasbourg, 67401 Illkirch, France
| | - Frank Kober
- the CRMBM, CNRS, UMR 7339, University of Aix-Marseille, 13385 Marseille, France, and
| | - Monique Bernard
- the CRMBM, CNRS, UMR 7339, University of Aix-Marseille, 13385 Marseille, France, and
| | - Emmanuelle Canet-Soulas
- the CREATIS-LRMN, CNRS, UMR 5220, U630 INSERM, 69621 Villeurbanne, Lyon-1 University, Lyon, France
| | | | - Philippe Boucher
- From the CNRS, UMR 7213, University of Strasbourg, 67401 Illkirch, France,
| | - Rachel L Matz
- From the CNRS, UMR 7213, University of Strasbourg, 67401 Illkirch, France,
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50
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Zhu R, Blazeski A, Poon E, Costa KD, Tung L, Boheler KR. Physical developmental cues for the maturation of human pluripotent stem cell-derived cardiomyocytes. Stem Cell Res Ther 2014; 5:117. [PMID: 25688759 PMCID: PMC4396914 DOI: 10.1186/scrt507] [Citation(s) in RCA: 83] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Human pluripotent stem cell-derived cardiomyocytes (hPSC-CMs) are the most promising source of cardiomyocytes (CMs) for experimental and clinical applications, but their use is largely limited by a structurally and functionally immature phenotype that most closely resembles embryonic or fetal heart cells. The application of physical stimuli to influence hPSC-CMs through mechanical and bioelectrical transduction offers a powerful strategy for promoting more developmentally mature CMs. Here we summarize the major events associated with in vivo heart maturation and structural development. We then review the developmental state of in vitro derived hPSC-CMs, while focusing on physical (electrical and mechanical) stimuli and contributory (metabolic and hypertrophic) factors that are actively involved in structural and functional adaptations of hPSC-CMs. Finally, we highlight areas for possible future investigation that should provide a better understanding of how physical stimuli may promote in vitro development and lead to mechanistic insights. Advances in the use of physical stimuli to promote developmental maturation will be required to overcome current limitations and significantly advance research of hPSC-CMs for cardiac disease modeling, in vitro drug screening, cardiotoxicity analysis and therapeutic applications.
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