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  1. Article ; Online: Measuring the Contractile Kinetics of Isolated Myofibrils from Human-Induced Pluripotent Stem Cell Derived Cardiomyocyte (hiPSC-CM) Models of Cardiomyopathy.

    Mohran, Saffie / Steczina, Sonette / Mandrycky, Christian / Kao, Kerry / Regnier, Michael

    Methods in molecular biology (Clifton, N.J.)

    2023  Volume 2735, Page(s) 213–233

    Abstract: Isolated myofibrils provide biomechanical data at the contractile organelle level that are independent of cellular calcium handling and signaling pathways. These myofibrils can be harvested from animal tissue, human muscle biopsies, or stem cell-derived ... ...

    Abstract Isolated myofibrils provide biomechanical data at the contractile organelle level that are independent of cellular calcium handling and signaling pathways. These myofibrils can be harvested from animal tissue, human muscle biopsies, or stem cell-derived striated muscle. Here we present our myofibril isolation and rapid solution switching protocols, which allow for precise measurements of activation (kinetics and tension generation) and a biphasic relaxation relationship (initial slow isometric relaxation followed by a fast exponential decay in tension). This experiment is generated on a custom-built myofibril apparatus utilizing a two-photodiode array to detect micron level deflection of our forged glass tip force transducers. A complete activation/relaxation curve can be produced from a single myofibril in under 30 minutes.
    MeSH term(s) Animals ; Humans ; Myofibrils/metabolism ; Myocytes, Cardiac/metabolism ; Induced Pluripotent Stem Cells/metabolism ; Myocardial Contraction/physiology ; Cardiomyopathies/metabolism ; Sarcomeres/metabolism ; Kinetics ; Calcium/metabolism
    Chemical Substances Calcium (SY7Q814VUP)
    Language English
    Publishing date 2023-12-01
    Publishing country United States
    Document type Journal Article
    ISSN 1940-6029
    ISSN (online) 1940-6029
    DOI 10.1007/978-1-0716-3527-8_12
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: 3D curvature-instructed endothelial flow response and tissue vascularization.

    Mandrycky, Christian / Hadland, Brandon / Zheng, Ying

    Science advances

    2020  Volume 6, Issue 38

    Abstract: Vascularization remains a long-standing challenge in engineering complex tissues. Particularly needed is recapitulating 3D vascular features, including continuous geometries with defined diameter, curvature, and torsion. Here, we developed a spiral ... ...

    Abstract Vascularization remains a long-standing challenge in engineering complex tissues. Particularly needed is recapitulating 3D vascular features, including continuous geometries with defined diameter, curvature, and torsion. Here, we developed a spiral microvessel model that allows precise control of curvature and torsion and supports homogeneous tissue perfusion at the centimeter scale. Using this system, we showed proof-of-principle modeling of tumor progression and engineered cardiac tissue vascularization. We demonstrated that 3D curvature induced rotation and mixing under laminar flow, leading to unique phenotypic and transcriptional changes in endothelial cells (ECs). Bulk and single-cell RNA-seq identified specific EC gene clusters in spiral microvessels. These mark a proinflammatory phenotype associated with vascular development and remodeling, and a unique cell cluster expressing genes regulating vascular stability and development. Our results shed light on the role of heterogeneous vascular structures in differential development and pathogenesis and provide previously unavailable tools to potentially improve tissue vascularization and regeneration.
    MeSH term(s) Endothelial Cells ; Heart/physiology ; Humans ; Microvessels ; Neovascularization, Pathologic/genetics ; Tissue Engineering/methods ; Tissue Scaffolds
    Language English
    Publishing date 2020-09-16
    Publishing country United States
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't
    ZDB-ID 2810933-8
    ISSN 2375-2548 ; 2375-2548
    ISSN (online) 2375-2548
    ISSN 2375-2548
    DOI 10.1126/sciadv.abb3629
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Organ-on-a-chip systems for vascular biology.

    Mandrycky, Christian J / Howard, Caitlin C / Rayner, Samuel G / Shin, Yu Jung / Zheng, Ying

    Journal of molecular and cellular cardiology

    2021  Volume 159, Page(s) 1–13

    Abstract: Organ-on-a-chip (OOC) platforms involve the miniaturization of cell culture systems and enable a variety of novel experimental approaches. These range from modeling the independent effects of biophysical forces on cells to screening novel drugs in multi- ... ...

    Abstract Organ-on-a-chip (OOC) platforms involve the miniaturization of cell culture systems and enable a variety of novel experimental approaches. These range from modeling the independent effects of biophysical forces on cells to screening novel drugs in multi-organ microphysiological systems, all within microscale devices. As in living systems, the incorporation of vascular structure is a key feature common to almost all organ-on-a-chip systems. In this review we highlight recent advances in organ-on-a-chip technologies with a focus on the vasculature. We first present the developmental process of the blood vessels through which vascular cells assemble into networks and remodel to form complex vascular beds under flow. We then review self-assembled vascular models and flow systems for the study of vascular development and biology as well as pre-patterned vascular models for the generation of perfusable microvessels for modeling vascular and tissue function. We finally conclude with a perspective on developing future OOC approaches for studying different aspects of vascular biology. We highlight the fit for purpose selection of OOC models towards either simple but powerful testbeds for therapeutic development, or complex vasculature to accurately replicate human physiology for specific disease modeling and tissue regeneration.
    MeSH term(s) Animals ; Biology/methods ; Blood Vessels/physiology ; Guided Tissue Regeneration/methods ; Humans ; Lab-On-A-Chip Devices
    Language English
    Publishing date 2021-06-09
    Publishing country England
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't ; Research Support, U.S. Gov't, Non-P.H.S. ; Review
    ZDB-ID 80157-4
    ISSN 1095-8584 ; 0022-2828
    ISSN (online) 1095-8584
    ISSN 0022-2828
    DOI 10.1016/j.yjmcc.2021.06.002
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: The biochemically defined super relaxed state of myosin-A paradox.

    Mohran, Saffie / Kooiker, Kristina / Mahoney-Schaefer, Max / Mandrycky, Christian / Kao, Kerry / Tu, An-Yue / Freeman, Jeremy / Moussavi-Harami, Farid / Geeves, Michael / Regnier, Michael

    The Journal of biological chemistry

    2023  Volume 300, Issue 1, Page(s) 105565

    Abstract: The biochemical SRX (super-relaxed) state of myosin has been defined as a low ATPase activity state. This state can conserve energy when the myosin is not recruited for muscle contraction. The SRX state has been correlated with a structurally defined ... ...

    Abstract The biochemical SRX (super-relaxed) state of myosin has been defined as a low ATPase activity state. This state can conserve energy when the myosin is not recruited for muscle contraction. The SRX state has been correlated with a structurally defined ordered (versus disordered) state of muscle thick filaments. The two states may be linked via a common interacting head motif (IHM) where the two heads of heavy meromyosin (HMM), or myosin, fold back onto each other and form additional contacts with S2 and the thick filament. Experimental observations of the SRX, IHM, and the ordered form of thick filaments, however, do not always agree, and result in a series of unresolved paradoxes. To address these paradoxes, we have reexamined the biochemical measurements of the SRX state for porcine cardiac HMM. In our hands, the commonly employed mantATP displacement assay was unable to quantify the population of the SRX state with all data fitting very well by a single exponential. We further show that mavacamten inhibits the basal ATPases of both porcine ventricle HMM and S1 (K
    MeSH term(s) Animals ; Adenosine Triphosphatases/antagonists & inhibitors ; Adenosine Triphosphatases/metabolism ; Adenosine Triphosphate/analogs & derivatives ; Adenosine Triphosphate/metabolism ; Amino Acid Motifs ; Benzylamines/pharmacology ; Enzyme Assays/methods ; Enzyme Assays/standards ; Heart Ventricles/drug effects ; Heart Ventricles/enzymology ; Heart Ventricles/metabolism ; Myocardial Contraction ; Myosin Subfragments/chemistry ; Myosin Subfragments/metabolism ; Nonmuscle Myosin Type IIA/chemistry ; Nonmuscle Myosin Type IIA/metabolism ; ortho-Aminobenzoates/metabolism ; Swine ; Uracil/analogs & derivatives ; Uracil/pharmacology
    Chemical Substances 3'-O-(N-methylanthraniloyl) ATP (85287-56-5) ; Adenosine Triphosphatases (EC 3.6.1.-) ; Adenosine Triphosphate (8L70Q75FXE) ; Benzylamines ; MYK-461 ; Myosin Subfragments ; Nonmuscle Myosin Type IIA (EC 3.6.1.-) ; ortho-Aminobenzoates ; Uracil (56HH86ZVCT)
    Language English
    Publishing date 2023-12-14
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2997-x
    ISSN 1083-351X ; 0021-9258
    ISSN (online) 1083-351X
    ISSN 0021-9258
    DOI 10.1016/j.jbc.2023.105565
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article: Tissue engineering toward organ-specific regeneration and disease modeling.

    Mandrycky, Christian / Phong, Kiet / Zheng, Ying

    MRS communications

    2017  Volume 7, Issue 3, Page(s) 332–347

    Abstract: Tissue engineering has been recognized as a translational approach to replace damaged tissue or whole organs. Engineering tissue, however, faces an outstanding knowledge gap in the challenge to fully recapitulate complex organ-specific features. Major ... ...

    Abstract Tissue engineering has been recognized as a translational approach to replace damaged tissue or whole organs. Engineering tissue, however, faces an outstanding knowledge gap in the challenge to fully recapitulate complex organ-specific features. Major components, such as cells, matrix, and architecture, must each be carefully controlled to engineer tissue-specific structure and function that mimics what is found in vivo. Here we review different methods to engineer tissue, and discuss critical challenges in recapitulating the unique features and functional units in four major organs-the kidney, liver, heart, and lung, which are also the top four candidates for organ transplantation in the USA. We highlight advances in tissue engineering approaches to enable the regeneration of complex tissue and organ substitutes, and provide tissue-specific models for drug testing and disease modeling. We discuss the current challenges and future perspectives toward engineering human tissue models.
    Language English
    Publishing date 2017-07-31
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2645443-9
    ISSN 2159-6867 ; 2159-6859
    ISSN (online) 2159-6867
    ISSN 2159-6859
    DOI 10.1557/mrc.2017.58
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: Multiphoton-Guided Creation of Complex Organ-Specific Microvasculature.

    Rayner, Samuel G / Howard, Caitlin C / Mandrycky, Christian J / Stamenkovic, Stefan / Himmelfarb, Jonathan / Shih, Andy Y / Zheng, Ying

    Advanced healthcare materials

    2021  Volume 10, Issue 10, Page(s) e2100031

    Abstract: Engineering functional human tissues in vitro is currently limited by difficulty replicating the small caliber, complex connectivity, cellularity, and 3D curvature of the native microvasculature. Multiphoton ablation has emerged as a promising technique ... ...

    Abstract Engineering functional human tissues in vitro is currently limited by difficulty replicating the small caliber, complex connectivity, cellularity, and 3D curvature of the native microvasculature. Multiphoton ablation has emerged as a promising technique for fabrication of microvascular structures with high resolution and full 3D control, but cellularization and perfusion of complex capillary-scale structures has remained challenging. Here, multiphoton ablation combined with guided endothelial cell growth from pre-formed microvessels is used to successfully create perfusable and cellularized organ-specific microvascular structures at anatomic scale within collagen hydrogels. Fabrication and perfusion of model 3D pulmonary and renal microvascular beds is demonstrated, as is replication and perfusion of a brain microvascular unit derived from in vivo data. Successful endothelialization and blood perfusion of a kidney-specific microvascular structure is achieved, using laser-guided angiogenesis. Finally, proof-of-concept hierarchical blood vessels and complex multicellular models are created, using multistep patterning with multiphoton ablation techniques. These successes open new doors for the creation of engineered tissues and organ-on-a-chip devices.
    MeSH term(s) Ablation Techniques ; Endothelial Cells ; Humans ; Microvessels ; Perfusion ; Tissue Engineering ; Veins
    Language English
    Publishing date 2021-02-15
    Publishing country Germany
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't ; Research Support, U.S. Gov't, Non-P.H.S.
    ZDB-ID 2649576-4
    ISSN 2192-2659 ; 2192-2640
    ISSN (online) 2192-2659
    ISSN 2192-2640
    DOI 10.1002/adhm.202100031
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article: Full-length dystrophin deficiency leads to contractile and calcium transient defects in human engineered heart tissues.

    Bremner, Samantha B / Mandrycky, Christian J / Leonard, Andrea / Padgett, Ruby M / Levinson, Alan R / Rehn, Ethan S / Pioner, J Manuel / Sniadecki, Nathan J / Mack, David L

    Journal of tissue engineering

    2022  Volume 13, Page(s) 20417314221119628

    Abstract: Cardiomyopathy is currently the leading cause of death for patients with Duchenne muscular dystrophy (DMD), a severe neuromuscular disorder affecting young boys. Animal models have provided insight into the mechanisms by which dystrophin protein ... ...

    Abstract Cardiomyopathy is currently the leading cause of death for patients with Duchenne muscular dystrophy (DMD), a severe neuromuscular disorder affecting young boys. Animal models have provided insight into the mechanisms by which dystrophin protein deficiency causes cardiomyopathy, but there remains a need to develop human models of DMD to validate pathogenic mechanisms and identify therapeutic targets. Here, we have developed human engineered heart tissues (EHTs) from CRISPR-edited, human induced pluripotent stem cell-derived cardiomyocytes (hiPSC-CMs) expressing a truncated dystrophin protein lacking part of the actin-binding domain. The 3D EHT platform enables direct measurement of contractile force, simultaneous monitoring of Ca
    Language English
    Publishing date 2022-08-17
    Publishing country England
    Document type Journal Article
    ZDB-ID 2573915-3
    ISSN 2041-7314
    ISSN 2041-7314
    DOI 10.1177/20417314221119628
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article ; Online: Endothelial Responses to Curvature-Induced Flow Patterns in Engineered Cerebral Aneurysms.

    Mandrycky, Christian J / Abel, Ashley N / Levy, Samuel / Marsh, Laurel M / Chassagne, Fanette / Chivukula, Venkat K / Barczay, Sari E / Kelly, Cory M / Kim, Louis J / Aliseda, Alberto / Levitt, Michael R / Zheng, Ying

    Journal of biomechanical engineering

    2022  Volume 145, Issue 1

    Abstract: Hemodynamic factors have long been associated with clinical outcomes in the treatment of cerebral aneurysms. Computational studies of cerebral aneurysm hemodynamics have provided valuable estimates of the mechanical environment experienced by the ... ...

    Abstract Hemodynamic factors have long been associated with clinical outcomes in the treatment of cerebral aneurysms. Computational studies of cerebral aneurysm hemodynamics have provided valuable estimates of the mechanical environment experienced by the endothelium in both the parent vessel and aneurysmal dome walls and have correlated them with disease state. These computational-clinical studies have recently been correlated with the response of endothelial cells (EC) using either idealized or patient-specific models. Here, we present a robust workflow for generating anatomic-scale aneurysm models, establishing luminal cultures of ECs at physiological relevant flow profiles, and comparing EC responses to curvature mediated flow. We show that flow patterns induced by parent vessel curvature produce changes in wall shear stress (WSS) and wall shear stress gradients (WSSG) that are correlated with differences in cell morphology and cellular protein localization. Cells in higher WSS regions align better with the flow and display strong Notch1-extracellular domain (ECD) polarization, while, under low WSS, differences in WSSG due to curvature change were associated with less alignment and attenuation of Notch1-ECD polarization in ECs of the corresponding regions. These proof-of-concept results highlight the use of engineered cellularized aneurysm models for connecting computational fluid dynamics to the underlying endothelial biology that mediates disease.
    MeSH term(s) Endothelial Cells ; Endothelium/metabolism ; Hemodynamics/physiology ; Humans ; Hydrodynamics ; Intracranial Aneurysm ; Models, Cardiovascular ; Stress, Mechanical
    Language English
    Publishing date 2022-07-11
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't ; Research Support, N.I.H., Extramural
    ZDB-ID 243094-0
    ISSN 1528-8951 ; 0148-0731
    ISSN (online) 1528-8951
    ISSN 0148-0731
    DOI 10.1115/1.4054981
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article ; Online: Endothelial-derived von Willebrand factor accelerates fibrin clotting within engineered microvessels.

    Rayner, Samuel G / Scholl, Zackary / Mandrycky, Christian J / Chen, Junmei / LaValley, Karina N / Leary, Peter J / Altemeier, William A / Liles, W Conrad / Chung, Dominic W / López, José A / Fu, Hongxia / Zheng, Ying

    Journal of thrombosis and haemostasis : JTH

    2022  Volume 20, Issue 7, Page(s) 1627–1637

    Abstract: Background: Von Willebrand factor (VWF) is classically associated with primary hemostasis and platelet-rich arterial thromboses, but recently has also been implicated in fibrin clotting and venous thrombosis. Direct interaction between fibrin and VWF ... ...

    Abstract Background: Von Willebrand factor (VWF) is classically associated with primary hemostasis and platelet-rich arterial thromboses, but recently has also been implicated in fibrin clotting and venous thrombosis. Direct interaction between fibrin and VWF may mediate these processes, although prior reports are conflicting.
    Objectives: We combined two complementary platforms to characterize VWF-fibrin(ogen) interactions and identify their potential physiologic significance.
    Methods: Engineered microvessels were lined with human endothelial cells, cultured under flow, and activated to release VWF and form transluminal VWF fibers. Fibrinogen, fibrin monomers, or polymerizing fibrin were then perfused, and interactions with VWF evaluated. Thrombin and fibrinogen were perfused into living versus paraformeldahyde-fixed microvessels and the pressure drop across microvessels monitored. Separately, protein binding to tethered VWF was assessed on a single-molecule level using total internal reflection fluorescence (TIRF) microscopy.
    Results: Within microvessels, VWF fibers colocalized with polymerizing fibrin, but not fibrinogen. TIRF microscopy showed no colocalization between VWF and fibrinogen or fibrin monomers in a microfluidic flow chamber across a range of shear rates and protein concentrations. Thrombin-mediated fibrin polymerization within living microvessels triggered endothelial VWF release, increasing the rate and amount of microvessel obstruction compared to fixed vessels with an inert endothelium.
    Conclusions: We did not identify specific binding between fibrin(ogen) and VWF at a single-molecule level. Despite this, our results suggest that rapid release of endothelial VWF during clotting may provide a physical support for fibrin polymerization and accelerate thrombosis. This interaction may be of fundamental importance for the understanding and treatment of human thrombotic disease.
    MeSH term(s) Endothelial Cells/metabolism ; Endothelium/metabolism ; Fibrin/chemistry ; Fibrinogen ; Humans ; Microvessels/metabolism ; Thrombin/chemistry ; Thrombosis ; von Willebrand Factor/metabolism
    Chemical Substances von Willebrand Factor ; Fibrin (9001-31-4) ; Fibrinogen (9001-32-5) ; Thrombin (EC 3.4.21.5)
    Language English
    Publishing date 2022-04-11
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't ; Research Support, N.I.H., Extramural
    ZDB-ID 2112661-6
    ISSN 1538-7836 ; 1538-7933
    ISSN (online) 1538-7836
    ISSN 1538-7933
    DOI 10.1111/jth.15714
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  10. Article: Danicamtiv increases myosin recruitment and alters the chemomechanical cross bridge cycle in cardiac muscle.

    Kooiker, Kristina B / Mohran, Saffie / Turner, Kyrah L / Ma, Weikang / Flint, Galina / Qi, Lin / Gao, Chengqian / Zheng, Yahan / McMillen, Timothy S / Mandrycky, Christian / Martinson, Amy / Mahoney-Schaefer, Max / Freeman, Jeremy C / Costales Arenas, Elijah Gabriela / Tu, An-Yu / Irving, Thomas C / Geeves, Michael A / Tanner, Bertrand C W / Regnier, Michael /
    Davis, Jennifer / Moussavi-Harami, Farid

    bioRxiv : the preprint server for biology

    2023  

    Abstract: Modulating myosin function is a novel therapeutic approach in patients with cardiomyopathy. Detailed mechanism of action of these agents can help predict potential unwanted affects and identify patient populations that can benefit most from them. ... ...

    Abstract Modulating myosin function is a novel therapeutic approach in patients with cardiomyopathy. Detailed mechanism of action of these agents can help predict potential unwanted affects and identify patient populations that can benefit most from them. Danicamtiv is a novel myosin activator with promising preclinical data that is currently in clinical trials. While it is known danicamtiv increases force and cardiomyocyte contractility without affecting calcium levels, detailed mechanistic studies regarding its mode of action are lacking. Using porcine cardiac tissue and myofibrils we demonstrate that Danicamtiv increases force and calcium sensitivity via increasing the number of myosin in the "on" state and slowing cross bridge turnover. Our detailed analysis shows that inhibition of ADP release results in decreased cross bridge turnover with cross bridges staying on longer and prolonging myofibril relaxation. Using a mouse model of genetic dilated cardiomyopathy, we demonstrated that Danicamtiv corrected calcium sensitivity in demembranated and abnormal twitch magnitude and kinetics in intact cardiac tissue.
    Significance statement: Directly augmenting sarcomere function has potential to overcome limitations of currently used inotropic agents to improve cardiac contractility. Myosin modulation is a novel mechanism for increased contraction in cardiomyopathies. Danicamtiv is a myosin activator that is currently under investigation for use in cardiomyopathy patients. Our study is the first detailed mechanism of how Danicamtiv increases force and alters kinetics of cardiac activation and relaxation. This new understanding of the mechanism of action of Danicamtiv can be used to help identify patients that could benefit most from this treatment.
    Language English
    Publishing date 2023-02-03
    Publishing country United States
    Document type Preprint
    DOI 10.1101/2023.01.31.526380
    Database MEDical Literature Analysis and Retrieval System OnLINE

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