3D bioprinted and integrated platforms for cardiac tissue modeling and drug testing

2021 ◽  
Author(s):  
Uijung Yong ◽  
Byeongmin Kang ◽  
Jinah Jang
Keyword(s):  
Electrical Properties ◽  
Real Time ◽  
Drug Testing ◽  
Cardiac Tissue ◽  
The Body ◽  
Cardiac Tissues ◽  
Tissue Modeling ◽  
Recent Trends ◽  
Cardiac Models ◽  
And Function

Abstract Recent advances in biofabrication techniques, including 3D bioprinting, have allowed for the fabrication of cardiac models that are similar to the human heart in terms of their structure (e.g., volumetric scale and anatomy) and function (e.g., contractile and electrical properties). The importance of developing techniques for assessing the characteristics of 3D cardiac substitutes in real time without damaging their structures has also been emphasized. In particular, the heart has two primary mechanisms for transporting blood through the body: contractility and an electrical system based on intra and extracellular calcium ion exchange. This review introduces recent trends in 3D bioprinted cardiac tissues and the measurement of their structural, contractile, and electrical properties in real time. Cardiac models have also been regarded as alternatives to animal models as drug-testing platforms. Thus, perspectives on the convergence of 3D bioprinted cardiac tissues and their assessment for use in drug development are also presented.

Biophysical stimulation for in vitro engineering of functional cardiac tissues

2017 ◽  
Vol 131 (13) ◽  
pp. 1393-1404 ◽  
Author(s):  
Anastasia Korolj ◽  
Erika Yan Wang ◽  
Robert A. Civitarese ◽  
Milica Radisic
Keyword(s):  
Cardiac Tissue ◽  
Culture Media ◽  
Culture Conditions ◽  
Lineage Specification ◽  
Cardiac Tissues ◽  
Cardiac Lineage ◽  
And Function ◽  
Tissue Models

Engineering functional cardiac tissues remains an ongoing significant challenge due to the complexity of the native environment. However, our growing understanding of key parameters of the in vivo cardiac microenvironment and our ability to replicate those parameters in vitro are resulting in the development of increasingly sophisticated models of engineered cardiac tissues (ECT). This review examines some of the most relevant parameters that may be applied in culture leading to higher fidelity cardiac tissue models. These include the biochemical composition of culture media and cardiac lineage specification, co-culture conditions, electrical and mechanical stimulation, and the application of hydrogels, various biomaterials, and scaffolds. The review will also summarize some of the recent functional human tissue models that have been developed for in vivo and in vitro applications. Ultimately, the creation of sophisticated ECT that replicate native structure and function will be instrumental in advancing cell-based therapeutics and in providing advanced models for drug discovery and testing.

scholarly journals Electroactive Polymeric Composites to Mimic the Electromechanical Properties of Myocardium in Cardiac Tissue Repair

Gels ◽  
2021 ◽  
Vol 7 (2) ◽  
pp. 53
Author(s):  
Kaylee Meyers ◽  
Bruce P. Lee ◽  
Rupak M. Rajachar
Keyword(s):  
Electrical Properties ◽  
Wound Repair ◽  
Cardiac Tissue ◽  
Cell Attachment ◽  
Polymeric Composites ◽  
Scar Tissue ◽  
Structure And Function ◽  
Force Transmission ◽  
Stem Cell Delivery ◽  
And Function

Due to the limited regenerative capabilities of cardiomyocytes, incidents of myocardial infarction can cause permanent damage to native myocardium through the formation of acellular, non-conductive scar tissue during wound repair. The generation of scar tissue in the myocardium compromises the biomechanical and electrical properties of the heart which can lead to further cardiac problems including heart failure. Currently, patients suffering from cardiac failure due to scarring undergo transplantation but limited donor availability and complications (i.e., rejection or infectious pathogens) exclude many individuals from successful transplant. Polymeric tissue engineering scaffolds provide an alternative approach to restore normal myocardium structure and function after damage by acting as a provisional matrix to support cell attachment, infiltration and stem cell delivery. However, issues associated with mechanical property mismatch and the limited electrical conductivity of these constructs when compared to native myocardium reduces their clinical applicability. Therefore, composite polymeric scaffolds with conductive reinforcement components (i.e., metal, carbon, or conductive polymers) provide tunable mechanical and electroactive properties to mimic the structure and function of natural myocardium in force transmission and electrical stimulation. This review summarizes recent advancements in the design, synthesis, and implementation of electroactive polymeric composites to better match the biomechanical and electrical properties of myocardial tissue.

scholarly journals Heart Slices to Model Cardiac Physiology

2021 ◽  
Vol 12 ◽  
Author(s):  
Moustafa H. Meki ◽  
Jessica M. Miller ◽  
Tamer M. A. Mohamed
Keyword(s):  
Drug Testing ◽  
Cardiac Tissue ◽  
Heart Tissue ◽  
The Body ◽  
Current Status ◽  
Slice Culture ◽  
Cardiac Physiology ◽  
Culture Systems ◽  
Organ Level

Translational research in the cardiovascular field is hampered by the unavailability of cardiac models that can recapitulate organ-level physiology of the myocardium. Outside the body, cardiac tissue undergoes rapid dedifferentiation and maladaptation in culture. There is an ever-growing demand for preclinical platforms that allow for accurate, standardized, long-term, and rapid drug testing. Heart slices is an emerging technology that solves many of the problems with conventional myocardial culture systems. Heart slices are thin (<400 µm) slices of heart tissue from the adult ventricle. Several recent studies using heart slices have shown their ability to maintain the adult phenotype for prolonged periods in a multi cell-type environment. Here, we review the current status of cardiac culture systems and highlight the unique advantages offered by heart slices in the light of recent efforts in developing physiologically relevant heart slice culture systems.

scholarly journals Modular assembly of thick multifunctional cardiac patches

2017 ◽  
Vol 114 (8) ◽  
pp. 1898-1903 ◽  
Author(s):  
Sharon Fleischer ◽  
Assaf Shapira ◽  
Ron Feiner ◽  
Tal Dvir
Keyword(s):  
Cardiac Tissue ◽  
Electrospun Fiber ◽  
Signal Propagation ◽  
Electrical Signal ◽  
Modular Assembly ◽  
Cardiac Tissues ◽  
Structure Morphology ◽  
Biomaterial Scaffolds ◽  
Fiber Scaffolds ◽  
And Function

In cardiac tissue engineering cells are seeded within porous biomaterial scaffolds to create functional cardiac patches. Here, we report on a bottom-up approach to assemble a modular tissue consisting of multiple layers with distinct structures and functions. Albumin electrospun fiber scaffolds were laser-patterned to create microgrooves for engineering aligned cardiac tissues exhibiting anisotropic electrical signal propagation. Microchannels were patterned within the scaffolds and seeded with endothelial cells to form closed lumens. Moreover, cage-like structures were patterned within the scaffolds and accommodated poly(lactic-co-glycolic acid) (PLGA) microparticulate systems that controlled the release of VEGF, which promotes vascularization, or dexamethasone, an anti-inflammatory agent. The structure, morphology, and function of each layer were characterized, and the tissue layers were grown separately in their optimal conditions. Before transplantation the tissue and microparticulate layers were integrated by an ECM-based biological glue to form thick 3D cardiac patches. Finally, the patches were transplanted in rats, and their vascularization was assessed. Because of the simple modularity of this approach, we believe that it could be used in the future to assemble other multicellular, thick, 3D, functional tissues.

scholarly journals Role of Cardiac Macrophages on Cardiac Inflammation, Fibrosis and Tissue Repair

Cells ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 51
Author(s):  
William P. Lafuse ◽  
Daniel J. Wozniak ◽  
Murugesan V. S. Rajaram
Keyword(s):  
Tissue Damage ◽  
Tissue Repair ◽  
Cardiac Tissue ◽  
Tissue Injury ◽  
The Body ◽  
T And B Cells ◽  
Functional Changes ◽  
Cardiac Inflammation ◽  
And Function

The immune system plays a pivotal role in the initiation, development and resolution of inflammation following insult or damage to organs. The heart is a vital organ which supplies nutrients and oxygen to all parts of the body. Heart failure (HF) has been conventionally described as a disease associated with cardiac tissue damage caused by systemic inflammation, arrhythmia and conduction defects. Cardiac inflammation and subsequent tissue damage is orchestrated by the infiltration and activation of various immune cells including neutrophils, monocytes, macrophages, eosinophils, mast cells, natural killer cells, and T and B cells into the myocardium. After tissue injury, monocytes and tissue-resident macrophages undergo marked phenotypic and functional changes, and function as key regulators of tissue repair, regeneration and fibrosis. Disturbance in resident macrophage functions such as uncontrolled production of inflammatory cytokines, growth factors and inefficient generation of an anti-inflammatory response or unsuccessful communication between macrophages and epithelial and endothelial cells and fibroblasts can lead to aberrant repair, persistent injury, and HF. Therefore, in this review, we discuss the role of cardiac macrophages on cardiac inflammation, tissue repair, regeneration and fibrosis.

Touchy-Feely History: The ‘Stuff’ of American Culture

2015 ◽  
Vol 4 (1) ◽  
pp. 4-18
Author(s):  
Lauren Rebecca Sklaroff
Keyword(s):  
Material Culture ◽  
Cultural History ◽  
Race And Ethnicity ◽  
The Body ◽  
Special Issue ◽  
Historical Significance ◽  
Research Perspectives ◽  
Economic Trends ◽  
Recent Trends ◽  
New Research

This state of the field essay examines recent trends in American Cultural History, focusing on music, race and ethnicity, material culture, and the body. Expanding on key themes in articles featured in the special issue of Cultural History, the essay draws linkages to other important literatures. The essay argues for more a more serious consideration of the products within popular culture, less as a reflection of social or economic trends, rather for their own historical significance. While the essay examines some classic texts, more emphasis is on work published within the last decade. Here, interdisciplinary methods are stressed, as are new research perspectives developing by non-western historians.

Online Measurement of Glucose Consumption from HepG2 Cells Using an Integrated Bioreactor and Enzymatic Assay

2018 ◽  
Author(s):  
Anna Adams ◽  
Radha Krishna Murthy Bulusu ◽  
Nikita Mukhitov ◽  
Jose Mendoza-Cortes ◽  
Michael Roper
Keyword(s):  
Real Time ◽  
Glucose Concentration ◽  
Hepg2 Cells ◽  
Glucose Consumption ◽  
Microfluidic System ◽  
Structure And Function ◽  
Online Measurement ◽  
Fluorescent Assay ◽  
And Function ◽  
Integrated Bioreactor

In this work, we developed a microfluidic bioreactor for optimizing growth and maintaining structure and function of HepG2, and when desired, the device could be removed and the extracellular output from the bioreactor combined with enzymatic glucose reagents into a droplet-based microfluidic system. The intensity of the resulting fluorescent assay product in the droplets was measured, and was directly correlated to glucose concentration, allowing the effect of insulin on glucose consumption in the HepG2 cells to be observed and quantified online and in near real-time.

Online Measurement of Glucose Consumption from HepG2 Cells Using an Integrated Bioreactor and Enzymatic Assay

2018 ◽  
Author(s):  
Anna Adams ◽  
Radha Krishna Murthy Bulusu ◽  
Nikita Mukhitov ◽  
Jose Mendoza-Cortes ◽  
Michael Roper
Keyword(s):  
Real Time ◽  
Glucose Concentration ◽  
Hepg2 Cells ◽  
Glucose Consumption ◽  
Microfluidic System ◽  
Structure And Function ◽  
Online Measurement ◽  
Fluorescent Assay ◽  
And Function ◽  
Integrated Bioreactor

In this work, we developed a microfluidic bioreactor for optimizing growth and maintaining structure and function of HepG2, and when desired, the device could be removed and the extracellular output from the bioreactor combined with enzymatic glucose reagents into a droplet-based microfluidic system. The intensity of the resulting fluorescent assay product in the droplets was measured, and was directly correlated to glucose concentration, allowing the effect of insulin on glucose consumption in the HepG2 cells to be observed and quantified online and in near real-time.

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