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Butler D, Reyes DR. Heart-on-a-chip systems: disease modeling and drug screening applications. LAB ON A CHIP 2024; 24:1494-1528. [PMID: 38318723 DOI: 10.1039/d3lc00829k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2024]
Abstract
Cardiovascular disease (CVD) is the leading cause of death worldwide, casting a substantial economic footprint and burdening the global healthcare system. Historically, pre-clinical CVD modeling and therapeutic screening have been performed using animal models. Unfortunately, animal models oftentimes fail to adequately mimic human physiology, leading to a poor translation of therapeutics from pre-clinical trials to consumers. Even those that make it to market can be removed due to unforeseen side effects. As such, there exists a clinical, technological, and economical need for systems that faithfully capture human (patho)physiology for modeling CVD, assessing cardiotoxicity, and evaluating drug efficacy. Heart-on-a-chip (HoC) systems are a part of the broader organ-on-a-chip paradigm that leverages microfluidics, tissue engineering, microfabrication, electronics, and gene editing to create human-relevant models for studying disease, drug-induced side effects, and therapeutic efficacy. These compact systems can be capable of real-time measurements and on-demand characterization of tissue behavior and could revolutionize the drug development process. In this review, we highlight the key components that comprise a HoC system followed by a review of contemporary reports of their use in disease modeling, drug toxicity and efficacy assessment, and as part of multi-organ-on-a-chip platforms. We also discuss future perspectives and challenges facing the field, including a discussion on the role that standardization is expected to play in accelerating the widespread adoption of these platforms.
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Affiliation(s)
- Derrick Butler
- Microsystems and Nanotechnology Division, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA.
| | - Darwin R Reyes
- Microsystems and Nanotechnology Division, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA.
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2
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Hasannejad F, Montazeri L, Mano JF, Bonakdar S, Fazilat A. Regulation of cell fate by cell imprinting approach in vitro. BIOIMPACTS : BI 2023; 14:29945. [PMID: 38938752 PMCID: PMC11199935 DOI: 10.34172/bi.2023.29945] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/10/2023] [Revised: 09/13/2023] [Accepted: 09/19/2023] [Indexed: 06/29/2024]
Abstract
Cell culture-based technologies are widely utilized in various domains such as drug evaluation, toxicity assessment, vaccine and biopharmaceutical development, reproductive technology, and regenerative medicine. It has been demonstrated that pre-adsorption of extracellular matrix (ECM) proteins including collagen, laminin and fibronectin provide more degrees of support for cell adhesion. The purpose of cell imprinting is to imitate the natural topography of cell membranes by gels or polymers to create a reliable environment for the regulation of cell function. The results of recent studies show that cell imprinting is a tool to guide the behavior of cultured cells by controlling their adhesive interactions with surfaces. Therefore, in this review we aim to compare different cell cultures with the imprinting method and discuss different cell imprinting applications in regenerative medicine, personalized medicine, disease modeling, and cell therapy.
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Affiliation(s)
- Farkhonde Hasannejad
- Department of Tissue Engineering and Applied Cell Sciences, School of Medicine, Semnan University of Medical Science, Semnan, Iran
- Genetic Department, Breast Cancer Research Center, Motamed Cancer Institute, ACECR, Tehran, Iran
| | - Leila Montazeri
- Department of Cell Engineering, Cell Science Research Center, Royan Institute for Stem Cell Biology and Technology, ACECR, Tehran, Iran
| | - João F Mano
- Department of Chemistry, CICECO - Aveiro Institute of Materials, University of Aveiro, Portugal
| | - Shahin Bonakdar
- National Cell Bank Department, Pasteur Institute of Iran, Tehran, Iran
| | - Ahmad Fazilat
- Genetic Department, Breast Cancer Research Center, Motamed Cancer Institute, ACECR, Tehran, Iran
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3
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Huangfu Y, Wang J, Feng J, Zhang ZL. Distal renal tubular system-on-a-chip for studying the pathogenesis of influenza A virus-induced kidney injury. LAB ON A CHIP 2023; 23:4255-4264. [PMID: 37674367 DOI: 10.1039/d3lc00616f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/08/2023]
Abstract
Influenza A viruses typically cause acute respiratory infections in humans. However, virus-induced acute kidney injury (AKI) has dramatically increased mortality. The pathogenesis remains poorly understood due to limited disease models. Here, a distal renal tubular system-on-a-chip (dRTSC) was constructed to explore the pathogenesis. The renal tubule-vascular reabsorption interface was recapitulated by co-culturing the distal renal tubule and peritubular vessel with a collagen-coated porous membrane. To study the pathways of influenza virus entry into the kidney, dynamic tracking of fluorescence-labeled virus-infected blood vessels was performed. For the first time, the virus was shown to enter the kidney rapidly by cell-free transmission without disrupting the vascular barrier. Direct virus infection of renal tubules in dRTSC reveals disruption of tight junctions, microvilli formation, polar distribution of ion transporters, and sodium reabsorption function. This robust platform allows for a straightforward investigation of virus-induced AKI pathogenesis. The combination with single-virus tracking technology provides new insights into understanding influenza virus-induced extra-respiratory disease.
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Affiliation(s)
- Yueyue Huangfu
- College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, 430072, P.R. China.
| | - Ji Wang
- College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, 430072, P.R. China.
| | - Jiao Feng
- College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, 430072, P.R. China.
| | - Zhi-Ling Zhang
- College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, 430072, P.R. China.
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4
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Abstract
Heart disease is a significant burden on global health care systems and is a leading cause of death each year. To improve our understanding of heart disease, high quality disease models are needed. These will facilitate the discovery and development of new treatments for heart disease. Traditionally, researchers have relied on 2D monolayer systems or animal models of heart disease to elucidate pathophysiology and drug responses. Heart-on-a-chip (HOC) technology is an emerging field where cardiomyocytes among other cell types in the heart can be used to generate functional, beating cardiac microtissues that recapitulate many features of the human heart. HOC models are showing great promise as disease modeling platforms and are poised to serve as important tools in the drug development pipeline. By leveraging advances in human pluripotent stem cell-derived cardiomyocyte biology and microfabrication technology, diseased HOCs are highly tuneable and can be generated via different approaches such as: using cells with defined genetic backgrounds (patient-derived cells), adding small molecules, modifying the cells' environment, altering cell ratio/composition of microtissues, among others. HOCs have been used to faithfully model aspects of arrhythmia, fibrosis, infection, cardiomyopathies, and ischemia, to name a few. In this review, we highlight recent advances in disease modeling using HOC systems, describing instances where these models outperformed other models in terms of reproducing disease phenotypes and/or led to drug development.
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Affiliation(s)
- Omar Mourad
- Toronto General Hospital Research Institute (O.M., R.Y., M.L., S.S.N.), University Health Network, Toronto, Canada.,Institute of Biomedical Engineering (O.M., R.Y., M.L., S.S.N.), University of Toronto, Canada
| | - Ryan Yee
- Toronto General Hospital Research Institute (O.M., R.Y., M.L., S.S.N.), University Health Network, Toronto, Canada.,Institute of Biomedical Engineering (O.M., R.Y., M.L., S.S.N.), University of Toronto, Canada
| | - Mengyuan Li
- Toronto General Hospital Research Institute (O.M., R.Y., M.L., S.S.N.), University Health Network, Toronto, Canada.,Institute of Biomedical Engineering (O.M., R.Y., M.L., S.S.N.), University of Toronto, Canada
| | - Sara S Nunes
- Toronto General Hospital Research Institute (O.M., R.Y., M.L., S.S.N.), University Health Network, Toronto, Canada.,Ajmera Transplant Center (S.S.N.), University Health Network, Toronto, Canada.,Institute of Biomedical Engineering (O.M., R.Y., M.L., S.S.N.), University of Toronto, Canada.,Department of Laboratory Medicine and Pathobiology (S.S.N.), University of Toronto, Canada.,Heart and Stroke/Richard Lewar Centre of Excellence (S.S.N.), University of Toronto, Canada
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5
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Paz-Artigas L, Montero-Calle P, Iglesias-García O, Mazo MM, Ochoa I, Ciriza J. Current approaches for the recreation of cardiac ischaemic environment in vitro. Int J Pharm 2023; 632:122589. [PMID: 36623742 DOI: 10.1016/j.ijpharm.2023.122589] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2022] [Revised: 12/14/2022] [Accepted: 01/04/2023] [Indexed: 01/09/2023]
Abstract
Myocardial ischaemia is one of the leading dead causes worldwide. Although animal experiments have historically provided a wealth of information, animal models are time and money consuming, and they usually miss typical human patient's characteristics associated with ischemia prevalence, including aging and comorbidities. Generating reliable in vitro models that recapitulate the human cardiac microenvironment during an ischaemic event can boost the development of new drugs and therapeutic strategies, as well as our understanding of the underlying cellular and molecular events, helping the optimization of therapeutic approaches prior to animal and clinical testing. Although several culture systems have emerged for the recreation of cardiac physiology, mimicking the features of an ischaemic heart tissue in vitro is challenging and certain aspects of the disease process remain poorly addressed. Here, current in vitro cardiac culture systems used for modelling cardiac ischaemia, from self-aggregated organoids to scaffold-based constructs and heart-on-chip platforms are described. The advantages of these models to recreate ischaemic hallmarks such as oxygen gradients, pathological alterations of mechanical strength or fibrotic responses are highlighted. The new models represent a step forward to be considered, but unfortunately, we are far away from recapitulating all complexity of the clinical situations.
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Affiliation(s)
- Laura Paz-Artigas
- Tissue Microenvironment (TME) Lab, Aragón Institute of Engineering Research (I3A), University of Zaragoza, 50018 Zaragoza, Spain; Institute for Health Research Aragón (IIS Aragón), 50009 Zaragoza, Spain
| | - Pilar Montero-Calle
- Regenerative Medicine Program, Cima Universidad de Navarra, and Instituto de Investigación Sanitaria de Navarra (IdiSNA), Pamplona, Spain
| | - Olalla Iglesias-García
- Regenerative Medicine Program, Cima Universidad de Navarra, and Instituto de Investigación Sanitaria de Navarra (IdiSNA), Pamplona, Spain
| | - Manuel M Mazo
- Regenerative Medicine Program, Cima Universidad de Navarra, and Instituto de Investigación Sanitaria de Navarra (IdiSNA), Pamplona, Spain; Hematology and Cell Therapy, Clínica Universidad de Navarra, and Instituto de Investigación Sanitaria de Navarra (IdiSNA), Pamplona, Spain
| | - Ignacio Ochoa
- Tissue Microenvironment (TME) Lab, Aragón Institute of Engineering Research (I3A), University of Zaragoza, 50018 Zaragoza, Spain; Institute for Health Research Aragón (IIS Aragón), 50009 Zaragoza, Spain; CIBER-BBN, ISCIII, Zaragoza, Spain.
| | - Jesús Ciriza
- Tissue Microenvironment (TME) Lab, Aragón Institute of Engineering Research (I3A), University of Zaragoza, 50018 Zaragoza, Spain; Institute for Health Research Aragón (IIS Aragón), 50009 Zaragoza, Spain; CIBER-BBN, ISCIII, Zaragoza, Spain.
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6
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Electrophysiological Changes of Human-Induced Pluripotent Stem Cell-Derived Cardiomyocytes during Acute Hypoxia and Reoxygenation. Stem Cells Int 2022; 2022:9438281. [PMID: 36579142 PMCID: PMC9792238 DOI: 10.1155/2022/9438281] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2022] [Revised: 11/14/2022] [Accepted: 12/07/2022] [Indexed: 12/23/2022] Open
Abstract
Ischemic heart disease is the most common cardiovascular disease and a major burden for healthcare worldwide. However, its pathophysiology is still not fully understood, and human-based models for disease mechanisms and treatments are needed. Here, we used human-induced pluripotent stem cell-derived cardiomyocytes (hiPSC-CMs) to model acute ischemia-reperfusion in our novel cell culture assembly. The assembly enables exchange of oxygen partial pressure for the cells within minutes, mimicking acute ischemic event. In this study, hypoxia was induced using 0% O2 gas for three hours and reoxygenation with 19% O2 gas for 24 hours in serum- and glucose-free medium. According to electrophysiological recordings, hypoxia decreased the hiPSC-CM-beating frequency and field potential (FP) amplitude. Furthermore, FP depolarization time and propagation slowed down. Most of the electrophysiological changes reverted during reoxygenation. However, immunocytochemical staining of the hypoxic and reoxygenation samples showed that morphological changes and changes in the sarcomere structure did not revert during reoxygenation but further deteriorated. qPCR results showed no significant differences in apoptosis or stress-related genes or in the expression of glycolytic genes. In conclusion, the hiPSC-CMs reproduced many characteristic changes of adult CMs during ischemia and reperfusion, indicating their usefulness as a human-based model of acute cardiac ischemia-reperfusion.
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7
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Rexius-Hall ML, Khalil NN, Escopete SS, Li X, Hu J, Yuan H, Parker SJ, McCain ML. A myocardial infarct border-zone-on-a-chip demonstrates distinct regulation of cardiac tissue function by an oxygen gradient. SCIENCE ADVANCES 2022; 8:eabn7097. [PMID: 36475790 PMCID: PMC9728975 DOI: 10.1126/sciadv.abn7097] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
After a myocardial infarction, the boundary between the injured, hypoxic tissue and the adjacent viable, normoxic tissue, known as the border zone, is characterized by an oxygen gradient. Yet, the impact of an oxygen gradient on cardiac tissue function is poorly understood, largely due to limitations of existing experimental models. Here, we engineered a microphysiological system to controllably expose engineered cardiac tissue to an oxygen gradient that mimics the border zone and measured the effects of the gradient on electromechanical function and the transcriptome. The gradient delayed calcium release, reuptake, and propagation; decreased diastolic and peak systolic stress; and increased expression of inflammatory cascades that are hallmarks of myocardial infarction. These changes were distinct from those observed in tissues exposed to uniform normoxia or hypoxia, demonstrating distinct regulation of cardiac tissue phenotypes by an oxygen gradient. Our border-zone-on-a-chip model advances functional and mechanistic insight into oxygen-dependent cardiac tissue pathophysiology.
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Affiliation(s)
- Megan L. Rexius-Hall
- Laboratory for Living Systems Engineering, Department of Biomedical Engineering, USC Viterbi School of Engineering, University of Southern California, Los Angeles, CA, USA
| | - Natalie N. Khalil
- Laboratory for Living Systems Engineering, Department of Biomedical Engineering, USC Viterbi School of Engineering, University of Southern California, Los Angeles, CA, USA
| | - Sean S. Escopete
- Smidt Heart Institute, Cedars-Sinai Medical Center, Los Angeles, CA, USA
| | - Xin Li
- Department of Mechanics and Aerospace Engineering, Southern University of Science and Technology, Shenzhen, Guangdong 518055, China
| | - Jiayi Hu
- Department of Mechanics and Aerospace Engineering, Southern University of Science and Technology, Shenzhen, Guangdong 518055, China
| | - Hongyan Yuan
- Department of Mechanics and Aerospace Engineering, Southern University of Science and Technology, Shenzhen, Guangdong 518055, China
| | - Sarah J. Parker
- Smidt Heart Institute, Cedars-Sinai Medical Center, Los Angeles, CA, USA
| | - Megan L. McCain
- Laboratory for Living Systems Engineering, Department of Biomedical Engineering, USC Viterbi School of Engineering, University of Southern California, Los Angeles, CA, USA
- Department of Stem Cell Biology and Regenerative Medicine, Keck School of Medicine of USC, University of Southern California, Los Angeles, CA, USA
- Corresponding author.
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8
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Wesseler MF, Johansen MN, Kızıltay A, Mortensen KI, Larsen NB. Optical 4D oxygen mapping of microperfused tissue models with tunable in vivo-like 3D oxygen microenvironments. LAB ON A CHIP 2022; 22:4167-4179. [PMID: 36155607 DOI: 10.1039/d2lc00063f] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
Sufficient and controllable oxygen supply is essential for in vitro 3D cell and tissue culture at high cell densities, which calls for volumetric in situ oxygen analysis methods to quantitatively assess the oxygen distribution. This paper presents a general approach for accurate and precise non-contact 3D mapping of oxygen tension in high cell-density cultures via embedded commercially available oxygen microsensor beads read out by confocal phosphorescence lifetime microscopy (PLIM). Optimal acquisition conditions and data analysis procedures are established and implemented in a publicly available software package. The versatility of the established method is first demonstrated in model-assisted fluidic design of microperfused 3D printed hydrogel culture chips with the aim of full culture oxygenation, and subsequently for monitoring and maintenance of physiologically relevant spatial and temporal oxygen gradients in the 3D printed chips controlled by static or dynamic flow conditions during 3D culture.
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Affiliation(s)
- Milan Finn Wesseler
- Department of Health Technology, DTU Health Tech, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark.
| | - Mathias Nørbæk Johansen
- Department of Health Technology, DTU Health Tech, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark.
| | - Aysel Kızıltay
- Department of Health Technology, DTU Health Tech, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark.
| | - Kim I Mortensen
- Department of Health Technology, DTU Health Tech, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark.
| | - Niels B Larsen
- Department of Health Technology, DTU Health Tech, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark.
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9
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Ellis BW, Ronan G, Ren X, Bahcecioglu G, Senapati S, Anderson D, Handberg E, March KL, Chang HC, Zorlutuna P. Human Heart Anoxia and Reperfusion Tissue (HEART) Model for the Rapid Study of Exosome Bound miRNA Expression As Biomarkers for Myocardial Infarction. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2022; 18:e2201330. [PMID: 35670145 PMCID: PMC9283287 DOI: 10.1002/smll.202201330] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/01/2022] [Revised: 04/27/2022] [Indexed: 05/12/2023]
Abstract
Current biomarkers for myocardial infarction (MI) diagnosis are typically late markers released upon cell death, incapable of distinguishing between ischemic and reperfusion injury and can be symptoms of other pathologies. Circulating microRNAs (miRNAs) have recently been proposed as alternative biomarkers for MI diagnosis; however, detecting the changes in the human cardiac miRNA profile during MI is extremely difficult. Here, to study the changes in miRNA levels during acute MI, a heart-on-chip model with a cardiac channel, containing human induced pluripotent stem cell (hiPSC)-derived cardiomyocytes in human heart decellularized matrix and collagen, and a vascular channel, containing hiPSC-derived endothelial cells, is developed. This model is exposed to anoxia followed by normoxia to mimic ischemia and reperfusion, respectively. Using a highly sensitive miRNA biosensor that the authors developed, the exact same increase in miR-1, miR-208b, and miR-499 levels in the MI-on-chip and the time-matched human blood plasma samples collected before and after ischemia and reperfusion, is shown. That the surface marker profile of exosomes in the engineered model changes in response to ischemic and reperfusion injury, which can be used as biomarkers to detect MI, is also shown. Hence, the MI-on-chip model developed here can be used in biomarker discovery.
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Affiliation(s)
- Bradley W Ellis
- Bioengineering Graduate Program, University of Notre Dame, Notre Dame, IN, 46556, USA
| | - George Ronan
- Bioengineering Graduate Program, University of Notre Dame, Notre Dame, IN, 46556, USA
| | - Xiang Ren
- Department of Aerospace and Mechanical Engineering, University of Notre Dame, Notre Dame, IN, 46556, USA
| | - Gokhan Bahcecioglu
- Department of Aerospace and Mechanical Engineering, University of Notre Dame, Notre Dame, IN, 46556, USA
| | - Satyajyoti Senapati
- Department of Chemical and Biomolecular Engineering, University of Notre Dame, Notre Dame, IN, 46556, USA
| | - David Anderson
- Division of Cardiology, Department of Medicine in the College of Medicine, University of Florida, Gainesville, FL, 32610, USA
| | - Eileen Handberg
- Division of Cardiology, Department of Medicine in the College of Medicine, University of Florida, Gainesville, FL, 32610, USA
| | - Keith L March
- Division of Cardiology, Department of Medicine in the College of Medicine, University of Florida, Gainesville, FL, 32610, USA
| | - Hsueh-Chia Chang
- Bioengineering Graduate Program, University of Notre Dame, Notre Dame, IN, 46556, USA
- Department of Aerospace and Mechanical Engineering, University of Notre Dame, Notre Dame, IN, 46556, USA
- Department of Chemical and Biomolecular Engineering, University of Notre Dame, Notre Dame, IN, 46556, USA
| | - Pinar Zorlutuna
- Bioengineering Graduate Program, University of Notre Dame, Notre Dame, IN, 46556, USA
- Department of Aerospace and Mechanical Engineering, University of Notre Dame, Notre Dame, IN, 46556, USA
- Department of Chemical and Biomolecular Engineering, University of Notre Dame, Notre Dame, IN, 46556, USA
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10
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Zamorano M, Castillo RL, Beltran JF, Herrera L, Farias JA, Antileo C, Aguilar-Gallardo C, Pessoa A, Calle Y, Farias JG. Tackling Ischemic Reperfusion Injury With the Aid of Stem Cells and Tissue Engineering. Front Physiol 2021; 12:705256. [PMID: 34603075 PMCID: PMC8484708 DOI: 10.3389/fphys.2021.705256] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2021] [Accepted: 08/11/2021] [Indexed: 01/14/2023] Open
Abstract
Ischemia is a severe condition in which blood supply, including oxygen (O), to organs and tissues is interrupted and reduced. This is usually due to a clog or blockage in the arteries that feed the affected organ. Reinstatement of blood flow is essential to salvage ischemic tissues, restoring O, and nutrient supply. However, reperfusion itself may lead to major adverse consequences. Ischemia-reperfusion injury is often prompted by the local and systemic inflammatory reaction, as well as oxidative stress, and contributes to organ and tissue damage. In addition, the duration and consecutive ischemia-reperfusion cycles are related to the severity of the damage and could lead to chronic wounds. Clinical pathophysiological conditions associated with reperfusion events, including stroke, myocardial infarction, wounds, lung, renal, liver, and intestinal damage or failure, are concomitant in due process with a disability, morbidity, and mortality. Consequently, preventive or palliative therapies for this injury are in demand. Tissue engineering offers a promising toolset to tackle ischemia-reperfusion injuries. It devises tissue-mimetics by using the following: (1) the unique therapeutic features of stem cells, i.e., self-renewal, differentiability, anti-inflammatory, and immunosuppressants effects; (2) growth factors to drive cell growth, and development; (3) functional biomaterials, to provide defined microarchitecture for cell-cell interactions; (4) bioprocess design tools to emulate the macroscopic environment that interacts with tissues. This strategy allows the production of cell therapeutics capable of addressing ischemia-reperfusion injury (IRI). In addition, it allows the development of physiological-tissue-mimetics to study this condition or to assess the effect of drugs. Thus, it provides a sound platform for a better understanding of the reperfusion condition. This review article presents a synopsis and discusses tissue engineering applications available to treat various types of ischemia-reperfusions, ultimately aiming to highlight possible therapies and to bring closer the gap between preclinical and clinical settings.
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Affiliation(s)
- Mauricio Zamorano
- Department of Chemical Engineering, Universidad de La Frontera, Temuco, Chile
| | | | - Jorge F Beltran
- Department of Chemical Engineering, Universidad de La Frontera, Temuco, Chile
| | - Lisandra Herrera
- Department of Chemical Engineering, Universidad de La Frontera, Temuco, Chile
| | - Joaquín A Farias
- Facultad de Ingeniería y Ciencias, Universidad Adolfo Ibíñtez, Santiago, Chile
| | - Christian Antileo
- Department of Chemical Engineering, Universidad de La Frontera, Temuco, Chile
| | - Cristobal Aguilar-Gallardo
- Hematological Transplant and Cell Therapy Unit, Hospital Universitario y Politécnico La Fe, Valencia, Spain
| | - Adalberto Pessoa
- Department of Biochemical and Pharmaceutical Technology, School of Pharmaceutical Sciences, University of São Paulo, São Paulo, Brazil
| | - Yolanda Calle
- Department of Life Sciences, Whitelands College, University of Roehampton, London, United Kingdom
| | - Jorge G Farias
- Department of Chemical Engineering, Universidad de La Frontera, Temuco, Chile
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11
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Murray BO, Flores C, Williams C, Flusberg DA, Marr EE, Kwiatkowska KM, Charest JL, Isenberg BC, Rohn JL. Recurrent Urinary Tract Infection: A Mystery in Search of Better Model Systems. Front Cell Infect Microbiol 2021; 11:691210. [PMID: 34123879 PMCID: PMC8188986 DOI: 10.3389/fcimb.2021.691210] [Citation(s) in RCA: 41] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2021] [Accepted: 05/04/2021] [Indexed: 12/12/2022] Open
Abstract
Urinary tract infections (UTIs) are among the most common infectious diseases worldwide but are significantly understudied. Uropathogenic E. coli (UPEC) accounts for a significant proportion of UTI, but a large number of other species can infect the urinary tract, each of which will have unique host-pathogen interactions with the bladder environment. Given the substantial economic burden of UTI and its increasing antibiotic resistance, there is an urgent need to better understand UTI pathophysiology - especially its tendency to relapse and recur. Most models developed to date use murine infection; few human-relevant models exist. Of these, the majority of in vitro UTI models have utilized cells in static culture, but UTI needs to be studied in the context of the unique aspects of the bladder's biophysical environment (e.g., tissue architecture, urine, fluid flow, and stretch). In this review, we summarize the complexities of recurrent UTI, critically assess current infection models and discuss potential improvements. More advanced human cell-based in vitro models have the potential to enable a better understanding of the etiology of UTI disease and to provide a complementary platform alongside animals for drug screening and the search for better treatments.
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Affiliation(s)
- Benjamin O. Murray
- Centre for Urological Biology, Department of Renal Medicine, University College London, London, United Kingdom
| | - Carlos Flores
- Centre for Urological Biology, Department of Renal Medicine, University College London, London, United Kingdom
| | - Corin Williams
- Department of Bioengineering, Charles Stark Draper Laboratory, Inc., Cambridge, MA, United States
| | - Deborah A. Flusberg
- Department of Bioengineering, Charles Stark Draper Laboratory, Inc., Cambridge, MA, United States
| | - Elizabeth E. Marr
- Department of Bioengineering, Charles Stark Draper Laboratory, Inc., Cambridge, MA, United States
| | - Karolina M. Kwiatkowska
- Centre for Urological Biology, Department of Renal Medicine, University College London, London, United Kingdom
| | - Joseph L. Charest
- Department of Bioengineering, Charles Stark Draper Laboratory, Inc., Cambridge, MA, United States
| | - Brett C. Isenberg
- Department of Bioengineering, Charles Stark Draper Laboratory, Inc., Cambridge, MA, United States
| | - Jennifer L. Rohn
- Centre for Urological Biology, Department of Renal Medicine, University College London, London, United Kingdom
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12
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Feaugas T, Sauvonnet N. Organ-on-chip to investigate host-pathogens interactions. Cell Microbiol 2021; 23:e13336. [PMID: 33798273 DOI: 10.1111/cmi.13336] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2020] [Revised: 03/17/2021] [Accepted: 03/18/2021] [Indexed: 11/29/2022]
Abstract
Infectious diseases remain the subject of intense research. This topic reaches a new era towards the study of host-pathogen interactions mechanisms at the tissue scale. The past few years have hence witnessed the emergence of new methods. Among them, organ-on-chip, which combines biomaterial technology, microfluidic and tissue engineering to recreate the organ physiology is very promising. This review summarises how this technology recapitulates the architecture, the mechanical stimulation and the interface of a tissue and how this particular microenvironment is critical to study host-pathogen interactions.
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Affiliation(s)
- Thomas Feaugas
- Group Intracellular Trafficking and Tissue Homeostasis, Institut Pasteur, Paris, France
| | - Nathalie Sauvonnet
- Group Intracellular Trafficking and Tissue Homeostasis, Institut Pasteur, Paris, France
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13
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Kobuszewska A, Jastrzębska E, Żukowski K, Brzózka Z. Simulation of hypoxia of myocardial cells in microfluidic systems. Sci Rep 2020; 10:15524. [PMID: 32968198 PMCID: PMC7511941 DOI: 10.1038/s41598-020-72660-w] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2020] [Accepted: 08/31/2020] [Indexed: 01/09/2023] Open
Abstract
The paper presents a newly designed microfluidic system that allows simulation of myocardial hypoxia by biochemical method. The geometry of the microsystem was designed in such a way, that quantitative fluorescent measurements using a spectrofluorometric plate reader was possible. Biochemical simulation of hypoxia was carried out using potent mitochondrial oxidative phosphorylation uncoupler—Carbonyl cyanide-4-(trifluoromethoxy)phenylhydrazone (FCCP). Two cardiac cell lines were used in the study—rat cardiomyoblasts (H9C2) and human cardiomyocytes. The effectiveness of biochemical simulation of hypoxia was studied using two fluorescent dyes: carbocyanine iodide (JC-1) and Fluo-4. Changes in the mitochondrial membrane potential and concentration of intracellular calcium ions were tested. The major novelty of this research was the applying the microfluidic system to create hypoxia conditions for cardiac cells using the biochemical approach. In further studies, the presented hypoxia model could be used to develop new methods of treatment of ischemic heart disease for example in cell therapy based on stem cells.
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Affiliation(s)
- Anna Kobuszewska
- Chair of Medical Biotechnology, Faculty of Chemistry, Warsaw University of Technology, Warsaw, Poland
| | - Elżbieta Jastrzębska
- Chair of Medical Biotechnology, Faculty of Chemistry, Warsaw University of Technology, Warsaw, Poland.
| | - Kamil Żukowski
- CEZAMAT, Warsaw University of Technology, Warsaw, Poland
| | - Zbigniew Brzózka
- Chair of Medical Biotechnology, Faculty of Chemistry, Warsaw University of Technology, Warsaw, Poland
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14
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Nemcovsky Amar D, Epshtein M, Korin N. Endothelial Cell Activation in an Embolic Ischemia-Reperfusion Injury Microfluidic Model. MICROMACHINES 2019; 10:E857. [PMID: 31817733 PMCID: PMC6952880 DOI: 10.3390/mi10120857] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/29/2019] [Revised: 11/25/2019] [Accepted: 12/04/2019] [Indexed: 12/14/2022]
Abstract
Ischemia, lack of blood supply, is associated with a variety of life-threatening cardiovascular diseases, including acute ischemic stroke and myocardial infraction. While blood flow restoration is critical to prevent further damage, paradoxically, rapid reperfusion can increase tissue damage. A variety of animal models have been developed to investigate ischemia/reperfusion injury (IRI), however they do not fully recapitulate human physiology of IRI. Here, we present a microfluidic IRI model utilizing a vascular compartment comprising human endothelial cells, which can be obstructed via a human blood clot and then re-perfused via thrombolytic treatment. Using our model, a significant increase in the expression of the endothelial cell inflammatory surface receptors E-selectin and I-CAM1 was observed in response to embolic occlusion. Following the demonstration of clot lysis and reperfusion via treatment using a thrombolytic agent, a significant decrease in the number of adherent endothelial cells and an increase in I-CAM1 levels compared to embolic occluded models, where reperfusion was not established, was observed. Altogether, the presented model can be applied to allow better understanding of human embolic based IRI and potentially serve as a platform for the development of improved and new therapeutic approaches.
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Affiliation(s)
| | | | - Netanel Korin
- Faculty of Biomedical Engineering, Technion-Israel Institute of Technology, Haifa 32000, Israel
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15
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Sidar B, Jenkins BR, Huang S, Spence JR, Walk ST, Wilking JN. Long-term flow through human intestinal organoids with the gut organoid flow chip (GOFlowChip). LAB ON A CHIP 2019; 19:3552-3562. [PMID: 31556415 PMCID: PMC8327675 DOI: 10.1039/c9lc00653b] [Citation(s) in RCA: 49] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
Human intestinal organoids (HIOs) are millimeter-scale models of the human intestinal epithelium and hold tremendous potential for advancing fundamental and applied biomedical research. HIOs resemble the native gut in that they consist of a fluid-filled lumen surrounded by a polarized epithelium and associated mesenchyme; however, their topologically-closed, spherical shape prevents flow through the interior luminal space, making the system less physiological and leading to the buildup of cellular and metabolic waste. These factors ultimately limit experimentation inside the HIOs. Here, we present a millifluidic device called the gut organoid flow chip (GOFlowChip), which we use to "port" HIOs and establish steady-state liquid flow through the lumen for multiple days. This long-term flow is enabled by the use of laser-cut silicone gaskets, which allow liquid in the device to be slightly pressurized, suppressing bubble formation. To demonstrate the utility of the device, we establish separate luminal and extraluminal flow and use luminal flow to remove accumulated waste. This represents the first demonstration of established liquid flow through the luminal space of a gastrointestinal organoid over physiologically relevant time scales. Flow cytometry results reveal that HIO cell viability is unaffected by long-term porting and luminal flow. We expect the real-time, long-term control over luminal and extraluminal contents provided by the GOFlowChip will enable a wide variety of studies including intestinal secretion, absorption, transport, and co-culture with intestinal microorganisms.
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Affiliation(s)
- Barkan Sidar
- Department of Chemical and Biological Engineering, Montana State University, Bozeman, MT, USA.
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16
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Rivera KR, Yokus MA, Erb PD, Pozdin VA, Daniele M. Measuring and regulating oxygen levels in microphysiological systems: design, material, and sensor considerations. Analyst 2019; 144:3190-3215. [PMID: 30968094 PMCID: PMC6564678 DOI: 10.1039/c8an02201a] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
As microfabrication techniques and tissue engineering methods improve, microphysiological systems (MPS) are being engineered that recapitulate complex physiological and pathophysiological states to supplement and challenge traditional animal models. Although MPS provide unique microenvironments that transcend common 2D cell culture, without proper regulation of oxygen content, MPS often fail to provide the biomimetic environment necessary to activate and investigate fundamental pathways of cellular metabolism and sub-cellular level. Oxygen exists in the human body in various concentrations and partial pressures; moreover, it fluctuates dramatically depending on fasting, exercise, and sleep patterns. Regulating oxygen content inside MPS necessitates a sensitive biological sensor to quantify oxygen content in real-time. Measuring oxygen in a microdevice is a non-trivial requirement for studies focused on understanding how oxygen impacts cellular processes, including angiogenesis and tumorigenesis. Quantifying oxygen inside a microdevice can be achieved via an array of technologies, with each method having benefits and limitations in terms of sensitivity, limits of detection, and invasiveness that must be considered and optimized. This article will review oxygen physiology in organ systems and offer comparisons of organ-specific MPS that do and do not consider oxygen microenvironments. Materials used in microphysiological models will also be analyzed in terms of their ability to control oxygen. Finally, oxygen sensor technologies are critically compared and evaluated for use in MPS.
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Affiliation(s)
- Kristina R Rivera
- Joint Department of Biomedical Engineering, North Carolina State University and University of North Carolina at Chapel Hill, 911 Oval Dr., Raleigh, NC 27695, USA.
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Kankala RK, Wang SB, Chen AZ. Microengineered Organ-on-a-chip Platforms towards Personalized Medicine. Curr Pharm Des 2019; 24:5354-5366. [DOI: 10.2174/1381612825666190222143542] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2018] [Accepted: 02/12/2019] [Indexed: 11/22/2022]
Abstract
Current preclinical drug evaluation strategies that are explored to predict the pharmacological parameters,
as well as toxicological issues, utilize traditional oversimplified cell cultures and animal models. However,
these traditional approaches are time-consuming, and cannot reproduce the functions of the complex biological
tissue architectures. On the other hand, the obtained data from animal models cannot be precisely extrapolated to
humans because it sometimes results in the distinct safe starting doses for clinical trials due to vast differences in
their genomes. To address these limitations, the microengineered, biomimetic organ-on-a-chip platforms fabricated
using advanced materials that are interconnected using the microfluidic circuits, can stanchly reiterate or
mimic the complex tissue-organ level structures including the cellular architecture and physiology, compartmentalization
and interconnectivity of human organ platforms. These innovative and cost-effective systems potentially
enable the prediction of the responses toward pharmaceutical compounds and remarkable advances in
materials and microfluidics technology, which can rapidly progress the drug development process. In this review,
we emphasize the integration of microfluidic models with the 3D simulations from tissue engineering to fabricate
organ-on-a-chip platforms, which explicitly fulfill the demand of creating the robust models for preclinical testing
of drugs. At first, we give a brief overview of the limitations associated with the current drug development pipeline
that includes drug screening methods, in vitro molecular assays, cell culture platforms and in vivo models.
Further, we discuss various organ-on-a-chip platforms, highlighting their benefits and performance in the preclinical
stages. Next, we aim to emphasize their current applications toward pharmaceutical benefits including the
drug screening as well as toxicity testing, and advances in personalized precision medicine as well as potential
challenges for their commercialization. We finally recapitulate with the lessons learned and the outlook highlighting
the future directions for accelerating the clinical translation of delivery systems.
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Affiliation(s)
- Ranjith Kumar Kankala
- Institute of Biomaterials and Tissue Engineering, Huaqiao University, Xiamen 361021, China
| | - Shi-Bin Wang
- College of Chemical Engineering, Huaqiao University, Xiamen 361021, China
| | - Ai-Zheng Chen
- Fujian Provincial Key Laboratory of Biochemical Technology (Huaqiao University), Xiamen 361021, China
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18
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Sex-dependent effect on mitochondrial and oxidative stress parameters in the hypothalamus induced by prepubertal stress and access to high fat diet. Neurochem Int 2019; 124:114-122. [PMID: 30639195 DOI: 10.1016/j.neuint.2019.01.008] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2018] [Revised: 01/03/2019] [Accepted: 01/07/2019] [Indexed: 12/13/2022]
Abstract
OBJECTIVE Some factors related to lifestyle, including stress and high-fat diet (HFD) consumption, are associated with higher prevalence of obesity. These factors can lead to an imbalance between ROS production and antioxidant defenses and to mitochondrial dysfunctions, which, in turn, could cause metabolic impairments, favoring the development of obesity. However, little is known about the interplay between these factors, particularly at early ages, and whether long-term sex-specific changes may occur. Here, we evaluated whether social isolation during the prepubertal period only, associated or not with chronic HFD, can exert long-term effects on oxidative status parameters and on mitochondrial function in the whole hypothalamus, in a sex-specific manner. METHODS Wistar male and female rats were divided into two groups (receiving standard chow or standard chow + HFD), that were subdivided into exposed or not to social isolation during the prepubertal period. Oxidative status parameters, and mitochondrial function were evaluated in the hypothalamus in the adult age. RESULTS Regarding antioxidant enzymes activities, HFD decreased GPx activity in the hypothalamus, while increasing SOD activity in females. Females also presented increased total thiols; however, non-protein thiols were lower. Main effects of stress and HFD were observed in TBARS levels in males, with both factors decreasing this parameter. Additionally, HFD increased complex IV activity, and decreased mitochondrial mass in females. Complex I-III activity was higher in males compared to females. CONCLUSION Stress during the prepubertal period and chronic consumption of HFD had persistent sex-specific effects on oxidative status, as well as on its consequences for the cell and for mitochondrial function. HFD had more detrimental effects on females, inducing oxidative imbalance, which resulted in damage to the mitochondria. This HFD-induced imbalance may be related to the development of obesity.
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19
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Modeling Host-Pathogen Interactions in the Context of the Microenvironment: Three-Dimensional Cell Culture Comes of Age. Infect Immun 2018; 86:IAI.00282-18. [PMID: 30181350 DOI: 10.1128/iai.00282-18] [Citation(s) in RCA: 82] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
Tissues and organs provide the structural and biochemical landscapes upon which microbial pathogens and commensals function to regulate health and disease. While flat two-dimensional (2-D) monolayers composed of a single cell type have provided important insight into understanding host-pathogen interactions and infectious disease mechanisms, these reductionist models lack many essential features present in the native host microenvironment that are known to regulate infection, including three-dimensional (3-D) architecture, multicellular complexity, commensal microbiota, gas exchange and nutrient gradients, and physiologically relevant biomechanical forces (e.g., fluid shear, stretch, compression). A major challenge in tissue engineering for infectious disease research is recreating this dynamic 3-D microenvironment (biological, chemical, and physical/mechanical) to more accurately model the initiation and progression of host-pathogen interactions in the laboratory. Here we review selected 3-D models of human intestinal mucosa, which represent a major portal of entry for infectious pathogens and an important niche for commensal microbiota. We highlight seminal studies that have used these models to interrogate host-pathogen interactions and infectious disease mechanisms, and we present this literature in the appropriate historical context. Models discussed include 3-D organotypic cultures engineered in the rotating wall vessel (RWV) bioreactor, extracellular matrix (ECM)-embedded/organoid models, and organ-on-a-chip (OAC) models. Collectively, these technologies provide a more physiologically relevant and predictive framework for investigating infectious disease mechanisms and antimicrobial therapies at the intersection of the host, microbe, and their local microenvironments.
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20
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Ariyasinghe NR, Lyra-Leite DM, McCain ML. Engineering cardiac microphysiological systems to model pathological extracellular matrix remodeling. Am J Physiol Heart Circ Physiol 2018; 315:H771-H789. [PMID: 29906229 PMCID: PMC6230901 DOI: 10.1152/ajpheart.00110.2018] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/08/2018] [Revised: 05/27/2018] [Accepted: 06/08/2018] [Indexed: 12/11/2022]
Abstract
Many cardiovascular diseases are associated with pathological remodeling of the extracellular matrix (ECM) in the myocardium. ECM remodeling is a complex, multifactorial process that often contributes to declines in myocardial function and progression toward heart failure. However, the direct effects of the many forms of ECM remodeling on myocardial cell and tissue function remain elusive, in part because conventional model systems used to investigate these relationships lack robust experimental control over the ECM. To address these shortcomings, microphysiological systems are now being developed and implemented to establish direct relationships between distinct features in the ECM and myocardial function with unprecedented control and resolution in vitro. In this review, we will first highlight the most prominent characteristics of ECM remodeling in cardiovascular disease and describe how these features can be mimicked with synthetic and natural biomaterials that offer independent control over multiple ECM-related parameters, such as rigidity and composition. We will then detail innovative microfabrication techniques that enable precise regulation of cellular architecture in two and three dimensions. We will also describe new approaches for quantifying multiple aspects of myocardial function in vitro, such as contractility, action potential propagation, and metabolism. Together, these collective technologies implemented as cardiac microphysiological systems will continue to uncover important relationships between pathological ECM remodeling and myocardial cell and tissue function, leading to new fundamental insights into cardiovascular disease, improved human disease models, and novel therapeutic approaches.
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Affiliation(s)
- Nethika R Ariyasinghe
- Laboratory for Living Systems Engineering, Department of Biomedical Engineering, USC Viterbi School of Engineering, University of Southern California , Los Angeles, California
| | - Davi M Lyra-Leite
- Laboratory for Living Systems Engineering, Department of Biomedical Engineering, USC Viterbi School of Engineering, University of Southern California , Los Angeles, California
| | - Megan L McCain
- Laboratory for Living Systems Engineering, Department of Biomedical Engineering, USC Viterbi School of Engineering, University of Southern California , Los Angeles, California
- Department of Stem Cell Biology and Regenerative Medicine, Keck School of Medicine, University of Southern California , Los Angeles, California
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21
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Morshed A, Dutta P. Mathematical Model for Tissue-Level Hypoxic Response in Microfluidic Environment. J Biomech Eng 2018; 140:2654664. [PMID: 28916839 DOI: 10.1115/1.4037915] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2017] [Indexed: 12/27/2022]
Abstract
Availability of essential species like oxygen is critical in shaping the dynamics of tumor growth. When the intracellular oxygen level falls below normal, it initiates major cascades in cellular dynamics leading to tumor cell survival. In a cellular block with cells growing away from the blood vessel, the scenario can be aggravated for the cells further inside the block. In this study, the dynamics of intracellular species inside a colony of tumor cells are investigated by varying the cell-block thickness and cell types in a microfluidic cell culture device. The oxygen transport across the cell block is modeled through diffusion, while ascorbate (AS) transport from the extracellular medium is addressed by a concentration-dependent uptake model. The extracellular and intracellular descriptions were coupled through the consumption and traffic of species from the microchannel to the cell block. Our model shows that the onset of hypoxia is possible in HeLa cell within minutes depending on the cell location, although the nutrient supply inside the channel is maintained in normoxic levels. This eventually leads to total oxygen deprivation inside the cell block in the extreme case, representing the development of a necrotic core that maintains a dynamic balance with growing cells and scarce supply. The numerical model reveals that species concentration and hypoxic response are different for HeLa and HelaS3 cells. Results also indicate that the long-term hypoxic response from a microfluidic cellular block stays within 5% of the values of a tissue with the basal layer. The hybrid model can be very useful in designing microfluidic experiments to satisfactorily predict the tissue-level response in cancer research.
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Affiliation(s)
- Adnan Morshed
- School of Mechanical and Materials Engineering, Washington State University, Pullman, WA 99164-2920 e-mail:
| | - Prashanta Dutta
- Fellow ASME School of Mechanical and Materials Engineering, Washington State University, Pullman, WA 99164-2920 e-mail:
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22
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Martewicz S, Gabrel G, Campesan M, Canton M, Di Lisa F, Elvassore N. Live Cell Imaging in Microfluidic Device Proves Resistance to Oxygen/Glucose Deprivation in Human Induced Pluripotent Stem Cell-Derived Cardiomyocytes. Anal Chem 2018; 90:5687-5695. [PMID: 29595056 DOI: 10.1021/acs.analchem.7b05347] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Analyses of cellular responses to fast oxygen dynamics are challenging and require ad hoc technological solutions, especially when decoupling from liquid media composition is required. In this work, we present a microfluidic device specifically designed for culture analyses with high resolution and magnification objectives, providing full optical access to the cell culture chamber. This feature allows fluorescence-based assays, photoactivated surface chemistry, and live cell imaging under tightly controlled pO2 environments. The device has a simple design, accommodates three independent cell cultures, and can be employed by users with basic cell culture training in studies requiring fast oxygen dynamics, defined media composition, and in-line data acquisition with optical molecular probes. We apply this technology to produce an oxygen/glucose deprived (OGD) environment and analyze cell mortality in murine and human cardiac cultures. Neonatal rat ventricular cardiomyocytes show an OGD time-dependent sensitivity, resulting in a robust and reproducible 66 ± 5% death rate after 3 h of stress. Applying an equivalent stress to human induced pluripotent stem cell-derived cardiomyocytes (hiPS-CMs) provides direct experimental evidence for fetal-like OGD-resistant phenotype. Investigation on the nature of such phenotype exposed large glycogen deposits. We propose a culture strategy aimed at depleting these intracellular energy stores and concurrently activate positive regulation of aerobic metabolic molecular markers. The observed process, however, is not sufficient to induce an OGD-sensitive phenotype in hiPS-CMs, highlighting defective development of mature aerobic metabolism in vitro.
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Affiliation(s)
- Sebastian Martewicz
- Shanghai Institute for Advanced Immunochemical Studies (SIAIS) , Shanghai Tech University , Shanghai , China.,Department of Industrial Engineering , University of Padova , via Marzolo 9 , 35131 Padova , Italy.,Venetian Institute of Molecular Medicine , via Orus 2 , 35129 Padova , Italy
| | - Giulia Gabrel
- Department of Industrial Engineering , University of Padova , via Marzolo 9 , 35131 Padova , Italy
| | - Marika Campesan
- Department of Biomedical Sciences , University of Padova , via Bassi 58/B , 35121 Padova , Italy
| | - Marcella Canton
- Department of Biomedical Sciences , University of Padova , via Bassi 58/B , 35121 Padova , Italy
| | - Fabio Di Lisa
- Department of Biomedical Sciences , University of Padova , via Bassi 58/B , 35121 Padova , Italy
| | - Nicola Elvassore
- Stem Cells & Regenerative Medicine Section , UCL Great Ormond Street Institute of Child Health , 30 Guilford Street , London WC1N 1EH , U.K.,Shanghai Institute for Advanced Immunochemical Studies (SIAIS) , Shanghai Tech University , Shanghai , China.,Department of Industrial Engineering , University of Padova , via Marzolo 9 , 35131 Padova , Italy.,Venetian Institute of Molecular Medicine , via Orus 2 , 35129 Padova , Italy
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23
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Ai X, Lu W, Zeng K, Li C, Jiang Y, Tu P. Microfluidic Coculture Device for Monitoring of Inflammation-Induced Myocardial Injury Dynamics. Anal Chem 2018. [PMID: 29533659 DOI: 10.1021/acs.analchem.7b04833] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
Emerging awareness of cardiac macrophages' role in inflammation after myocardial infarction indicates that overabundant proinflammatory macrophages induce accentuated myocardial injury. The investigation of the macrophages-cardiomyocytes interaction and inflammation-induced dynamic damage in myocardial infarction, especially in a spatiotemporally controlled manner, remains a huge challenge. Here, we developed an in vitro model using a microfluidic coculture system to mimic inflammatory cardiac injury. To our knowledge, on-chip pathological models focused on inflammation-induced myocardial injury have not been reported. The device consists of two sets of thin interconnecting grooves that isolate heterogeneous cells spatially but maintain their soluble factors communication. The mass transportation is visually characterized, and the complete diffusion reaches equilibrium within 100 s. We investigate the dynamic interaction between the macrophages and the cardiomyocytes in the spatiotemporal controlled microenvironment, mimicking a key aspect of the in vivo pathophysiological process. The results show that the activated macrophages induce time-lapsed apoptotic responses of the cardiac cells and damage mitochondria membrane integrity. The anti-inflammatory and cardio-protective effects of quercetin were explored on the chip. The extent of caspase-3 activation is asynchronous in the individual cardiac cells, suggesting the different apoptosis dynamics. We further demonstrate that the mechanism of activated inflammation is associated with the upregulation of several inflammatory cytokines and NF-κB pathway. Thus, the developed microfluidic coculture device provides a useful tool for real-time monitoring of inflammatory response for myocardial disease and holds potential for anti-inflammatory drug screening.
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Affiliation(s)
- Xiaoni Ai
- State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences , Peking University , Beijing 100191 , China
| | - Wenbo Lu
- State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences , Peking University , Beijing 100191 , China
| | - Kewu Zeng
- State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences , Peking University , Beijing 100191 , China
| | - Chun Li
- Modern Research Center for Traditional Chinese Medicine , Beijing University of Chinese Medicine , Beijing 100029 , China
| | - Yong Jiang
- State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences , Peking University , Beijing 100191 , China
| | - Pengfei Tu
- State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences , Peking University , Beijing 100191 , China
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24
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Pierozan P, Biasibetti-Brendler H, Schmitz F, Ferreira F, Netto CA, Wyse ATS. Synergistic Toxicity of the Neurometabolites Quinolinic Acid and Homocysteine in Cortical Neurons and Astrocytes: Implications in Alzheimer's Disease. Neurotox Res 2017; 34:147-163. [PMID: 29124681 DOI: 10.1007/s12640-017-9834-6] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2017] [Revised: 09/22/2017] [Accepted: 10/18/2017] [Indexed: 12/19/2022]
Abstract
The brain of patients affected by Alzheimer's disease (AD) develops progressive neurodegeneration linked to the formation of proteins aggregates. However, their single actions cannot explain the extent of brain damage observed in this disorder, and the characterization of co-adjuvant involved in the early toxic processes evoked in AD is essential. In this line, quinolinic acid (QUIN) and homocysteine (Hcy) appear to be involved in the AD neuropathogenesis. Herein, we investigate the effects of QUIN and Hcy on early toxic events in cortical neurons and astrocytes. Exposure of primary cortical cultures to these neurometabolites for 24 h induced concentration-dependent neurotoxicity. In addition, QUIN (25 μM) and Hcy (30 μM) triggered ROS production, lipid peroxidation, diminished of Na+,K+-ATPase activity, and morphologic alterations, culminating in reduced neuronal viability by necrotic cell death. In astrocytes, QUIN (100 μM) and Hcy (30 μM) induced caspase-3-dependent apoptosis and morphologic alterations through oxidative status imbalance. To establish specific mechanisms, we preincubated cell cultures with different protective agents. The combined toxicity of QUIN and Hcy was attenuated by melatonin and Trolox in neurons and by NMDA antagonists and glutathione in astrocytes. Cellular death and morphologic alterations were prevented when co-culture was treated with metabolites, suggesting the activation of protector mechanisms dependent on soluble factors and astrocyte and neuron communication through gap junctions. These findings suggest that early damaging events involved in AD can be magnified by synergistic toxicity of the QUIN and Hcy. Therefore, this study opens new possibilities to elucidate the molecular mechanisms of neuron-astrocyte interactions and their role in neuroprotection against QUIN and Hcy.
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Affiliation(s)
- Paula Pierozan
- Laboratório de Neuroproteção e Doenças Metabólicas, Departamento de Bioquímica, Instituto de Ciências Básicas da Saúde, Universidade Federal do Rio Grande do Sul, Rua Ramiro Barcelos 2600 anexo, Porto Alegre, RS, 90035-003, Brazil.
| | - Helena Biasibetti-Brendler
- Laboratório de Neuroproteção e Doenças Metabólicas, Departamento de Bioquímica, Instituto de Ciências Básicas da Saúde, Universidade Federal do Rio Grande do Sul, Rua Ramiro Barcelos 2600 anexo, Porto Alegre, RS, 90035-003, Brazil
- Programa de Pós-Graduação em Ciências Biológicas: Bioquímica, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil
| | - Felipe Schmitz
- Laboratório de Neuroproteção e Doenças Metabólicas, Departamento de Bioquímica, Instituto de Ciências Básicas da Saúde, Universidade Federal do Rio Grande do Sul, Rua Ramiro Barcelos 2600 anexo, Porto Alegre, RS, 90035-003, Brazil
- Programa de Pós-Graduação em Ciências Biológicas: Bioquímica, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil
| | - Fernanda Ferreira
- Laboratório de Neuroproteção e Doenças Metabólicas, Departamento de Bioquímica, Instituto de Ciências Básicas da Saúde, Universidade Federal do Rio Grande do Sul, Rua Ramiro Barcelos 2600 anexo, Porto Alegre, RS, 90035-003, Brazil
- Programa de Pós-Graduação em Ciências Biológicas: Bioquímica, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil
| | - Carlos Alexandre Netto
- Programa de Pós-Graduação em Ciências Biológicas: Bioquímica, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil
- Laboratório de Isquemia Cerebral e Psicobiologia dos Transtornos Mentais, Departamento de Bioquímica, Instituto de Ciências Básicas da Saúde, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil
- Departamento de Bioquímica, Instituto de Ciências Básicas da Saúde, Universidade Federal do Rio Grande do Sul, Rua Ramiro Barcelos, 2600-Anexo, CEP, Porto Alegre, RS, 90035-003, Brazil
| | - Angela T S Wyse
- Laboratório de Neuroproteção e Doenças Metabólicas, Departamento de Bioquímica, Instituto de Ciências Básicas da Saúde, Universidade Federal do Rio Grande do Sul, Rua Ramiro Barcelos 2600 anexo, Porto Alegre, RS, 90035-003, Brazil
- Programa de Pós-Graduação em Ciências Biológicas: Bioquímica, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil
- Departamento de Bioquímica, Instituto de Ciências Básicas da Saúde, Universidade Federal do Rio Grande do Sul, Rua Ramiro Barcelos, 2600-Anexo, CEP, Porto Alegre, RS, 90035-003, Brazil
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25
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Longhi R, Almeida RF, Pettenuzzo LF, Souza DG, Machado L, Quincozes-Santos A, Souza DO. Effect of a trans fatty acid-enriched diet on mitochondrial, inflammatory, and oxidative stress parameters in the cortex and hippocampus of Wistar rats. Eur J Nutr 2017; 57:1913-1924. [PMID: 28567576 DOI: 10.1007/s00394-017-1474-3] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2016] [Accepted: 05/19/2017] [Indexed: 01/22/2023]
Abstract
PURPOSE Previously showed that dietary trans fatty acids (TFAs) may cause systemic inflammation and affect the central nervous system (CNS) in Wistar rats by increased levels of cytokines in the cerebrospinal fluid (CSF) and serum (Longhi et al. Eur J Nutr 56(3):1003-1016, 1). Here, we aimed to clarifying the impact of diets with different TFA concentrations on cerebral tissue, focusing on hippocampus and cortex and behavioral performance. METHODS Wistar rats were fed either a normolipidic or a hyperlipidic diet for 90 days; diets had the same ingredients except for fat compositions, concentrations, and calories. We used lard in the cis fatty acid (CFA) group and PHSO in the TFA group. The intervention groups were as follows: (1) low lard (LL), (2) high lard (HL), (3) low partially hydrogenated soybean oil (LPHSO), and (4) high partially hydrogenated soybean oil (HPHSO). Mitochondrial parameters, tumor necrosis factor alpha (TNF-α), 2'7'-dichlorofluorescein (DCFH) levels in brain tissue, and open field task were analyzed. RESULTS A worse brain tissue response was associated with oxidative stress in cortex and hippocampus as well as impaired inflammatory and mitochondrial parameters at both PHSO concentrations and there were alterations in the behavioral performance. In many analyses, there were no significant differences between the LPHSO and HPHSO diets. CONCLUSIONS Partially hydrogenated soybean oil impaired cortical mitochondrial parameters and altered inflammatory and oxidative stress responses, and the hyperlipidic treatment caused locomotor and exploratory effects, but no differences on weight gain in all treatments. These findings suggest that quality is more important than the quantity of fat consumed in terms of CFA and TFA diets.
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Affiliation(s)
- Rafael Longhi
- Department of Biochemistry, Postgraduate Program in Biochemistry, Institute of Basic Health Sciences, Federal University of Rio Grande do Sul (UFRGS), Porto Alegre, Brazil.
| | - Roberto Farina Almeida
- Department of Biochemistry, Postgraduate Program in Biochemistry, Institute of Basic Health Sciences, Federal University of Rio Grande do Sul (UFRGS), Porto Alegre, Brazil
| | - Leticia Ferreira Pettenuzzo
- Department of Biochemistry, Postgraduate Program in Biochemistry, Institute of Basic Health Sciences, Federal University of Rio Grande do Sul (UFRGS), Porto Alegre, Brazil
| | - Débora Guerini Souza
- Department of Biochemistry, Postgraduate Program in Biochemistry, Institute of Basic Health Sciences, Federal University of Rio Grande do Sul (UFRGS), Porto Alegre, Brazil
| | - Letiane Machado
- Department of Biochemistry, Postgraduate Program in Biochemistry, Institute of Basic Health Sciences, Federal University of Rio Grande do Sul (UFRGS), Porto Alegre, Brazil
| | - André Quincozes-Santos
- Department of Biochemistry, Postgraduate Program in Biochemistry, Institute of Basic Health Sciences, Federal University of Rio Grande do Sul (UFRGS), Porto Alegre, Brazil
| | - Diogo Onofre Souza
- Department of Biochemistry, Postgraduate Program in Biochemistry, Institute of Basic Health Sciences, Federal University of Rio Grande do Sul (UFRGS), Porto Alegre, Brazil
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26
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Aziz AUR, Geng C, Fu M, Yu X, Qin K, Liu B. The Role of Microfluidics for Organ on Chip Simulations. Bioengineering (Basel) 2017; 4:E39. [PMID: 28952518 PMCID: PMC5590458 DOI: 10.3390/bioengineering4020039] [Citation(s) in RCA: 42] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2017] [Revised: 05/01/2017] [Accepted: 05/02/2017] [Indexed: 12/19/2022] Open
Abstract
A multichannel three-dimensional chip of a microfluidic cell culture which enables the simulation of organs is called an "organ on a chip" (OC). With the integration of many other technologies, OCs have been mimicking organs, substituting animal models, and diminishing the time and cost of experiments which is better than the preceding conventional in vitro models, which make them imperative tools for finding functional properties, pathological states, and developmental studies of organs. In this review, recent progress regarding microfluidic devices and their applications in cell cultures is discussed to explain the advantages and limitations of these systems. Microfluidics is not a solution but only an approach to create a controlled environment, however, other supporting technologies are needed, depending upon what is intended to be achieved. Microfluidic platforms can be integrated with additional technologies to enhance the organ on chip simulations. Besides, new directions and areas are mentioned for interested researchers in this field, and future challenges regarding the simulation of OCs are also discussed, which will make microfluidics more accurate and beneficial for biological applications.
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Affiliation(s)
- Aziz Ur Rehman Aziz
- Department of Biomedical Engineering, Dalian University of Technology, Dalian 116024, Liaoning Province, China.
| | - Chunyang Geng
- Department of Biomedical Engineering, Dalian University of Technology, Dalian 116024, Liaoning Province, China.
| | - Mengjie Fu
- Dalian Institute of Maternal and Child Health Care. Dalian 116024, Liaoning Province, China.
| | - Xiaohui Yu
- Dalian Institute of Maternal and Child Health Care. Dalian 116024, Liaoning Province, China.
| | - Kairong Qin
- Department of Biomedical Engineering, Dalian University of Technology, Dalian 116024, Liaoning Province, China.
| | - Bo Liu
- Department of Biomedical Engineering, Dalian University of Technology, Dalian 116024, Liaoning Province, China.
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Morshed A, Dutta P. Hypoxic behavior in cells under controlled microfluidic environment. Biochim Biophys Acta Gen Subj 2017; 1861:759-771. [PMID: 28111315 DOI: 10.1016/j.bbagen.2017.01.017] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2016] [Revised: 01/15/2017] [Accepted: 01/18/2017] [Indexed: 01/09/2023]
Abstract
BACKGROUND Depleted oxygen levels, known as hypoxia, causes considerable changes in the cellular metabolism. Hypoxia-inducible factors (HIF) act as the major protagonist in orchestrating manifold hypoxic responses by escaping cellular degradation mechanisms. These complex and dynamic intracellular responses are significantly dependent on the extracellular environment. In this study, we present a detailed model of a hypoxic cellular microenvironment in a microfluidic setting involving HIF hydroxylation. METHODS We have modeled the induction of hypoxia in a microfluidic chip by an unsteady permeation of oxygen from the microchannel through a porous polydimethylsiloxane channel wall. Extracellular and intracellular interactions were modeled with two different mathematical descriptions. Intracellular space is directly coupled to the extracellular environment through uptake and consumption of oxygen and ascorbate similar to cells in vivo. RESULTS Our results indicate a sharp switch in HIF hydroxylation behavior with changing prolyl hydroxylase levels from 0.1 to 4.0μM. Furthermore, we studied the effects of extracellular ascorbate concentration, using a new model, to predict its accumulation inside the cell over a relevant physiological range. In different hypoxic conditions, the cellular environment showed a significant dependence on oxygen levels in resulting intracellular response. CONCLUSIONS Change in hydroxylation behavior and nutrient supplementation can have significant potential in designing novel therapeutic interventions in cancer and ischemia/reperfusion injuries. GENERAL SIGNIFICANCE The hybrid mathematical model can effectively predict intracellular behavior due to external influences providing valuable directions in designing future experiments.
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Affiliation(s)
- Adnan Morshed
- School of Mechanical and Materials Engineering, Washington State University, Pullman, WA 99164-2920, United States
| | - Prashanta Dutta
- School of Mechanical and Materials Engineering, Washington State University, Pullman, WA 99164-2920, United States.
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28
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Borovjagin AV, Ogle BM, Berry JL, Zhang J. From Microscale Devices to 3D Printing: Advances in Fabrication of 3D Cardiovascular Tissues. Circ Res 2017; 120:150-165. [PMID: 28057791 PMCID: PMC5224928 DOI: 10.1161/circresaha.116.308538] [Citation(s) in RCA: 49] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/29/2016] [Revised: 10/03/2016] [Accepted: 10/19/2016] [Indexed: 01/14/2023]
Abstract
Current strategies for engineering cardiovascular cells and tissues have yielded a variety of sophisticated tools for studying disease mechanisms, for development of drug therapies, and for fabrication of tissue equivalents that may have application in future clinical use. These efforts are motivated by the need to extend traditional 2-dimensional (2D) cell culture systems into 3D to more accurately replicate in vivo cell and tissue function of cardiovascular structures. Developments in microscale devices and bioprinted 3D tissues are beginning to supplant traditional 2D cell cultures and preclinical animal studies that have historically been the standard for drug and tissue development. These new approaches lend themselves to patient-specific diagnostics, therapeutics, and tissue regeneration. The emergence of these technologies also carries technical challenges to be met before traditional cell culture and animal testing become obsolete. Successful development and validation of 3D human tissue constructs will provide powerful new paradigms for more cost effective and timely translation of cardiovascular tissue equivalents.
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Affiliation(s)
- Anton V Borovjagin
- From the Department of Biomedical Engineering, School of Medicine, School of Engineering, The University of Alabama at Birmingham (A.V.B., J.L.B., J.Z.); and Department of Biomedical Engineering, College of Science and Engineering, The University of Minnesota, Minneapolis (B.M.O.)
| | - Brenda M Ogle
- From the Department of Biomedical Engineering, School of Medicine, School of Engineering, The University of Alabama at Birmingham (A.V.B., J.L.B., J.Z.); and Department of Biomedical Engineering, College of Science and Engineering, The University of Minnesota, Minneapolis (B.M.O.)
| | - Joel L Berry
- From the Department of Biomedical Engineering, School of Medicine, School of Engineering, The University of Alabama at Birmingham (A.V.B., J.L.B., J.Z.); and Department of Biomedical Engineering, College of Science and Engineering, The University of Minnesota, Minneapolis (B.M.O.)
| | - Jianyi Zhang
- From the Department of Biomedical Engineering, School of Medicine, School of Engineering, The University of Alabama at Birmingham (A.V.B., J.L.B., J.Z.); and Department of Biomedical Engineering, College of Science and Engineering, The University of Minnesota, Minneapolis (B.M.O.).
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29
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Wang X, Liu Z, Pang Y. Concentration gradient generation methods based on microfluidic systems. RSC Adv 2017. [DOI: 10.1039/c7ra04494a] [Citation(s) in RCA: 113] [Impact Index Per Article: 16.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
Various concentration gradient generation methods based on microfluidic systems are summarized in this paper.
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Affiliation(s)
- Xiang Wang
- College of Mechanical Engineering and Applied Electronics Technology
- Beijing University of Technology
- Beijing 100124
- China
| | - Zhaomiao Liu
- College of Mechanical Engineering and Applied Electronics Technology
- Beijing University of Technology
- Beijing 100124
- China
| | - Yan Pang
- College of Mechanical Engineering and Applied Electronics Technology
- Beijing University of Technology
- Beijing 100124
- China
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Germain T, Ansari M, Pappas D. Observation of reversible, rapid changes in drug susceptibility of hypoxic tumor cells in a microfluidic device. Anal Chim Acta 2016; 936:179-84. [PMID: 27566353 DOI: 10.1016/j.aca.2016.07.040] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2016] [Revised: 07/20/2016] [Accepted: 07/27/2016] [Indexed: 12/12/2022]
Abstract
Hypoxia is a major stimulus for increased drug resistance and for survival of tumor cells. Work from our group and others has shown that hypoxia increases resistance to anti-cancer compounds, radiation, and other damage-pathway cytotoxic agents. In this work we utilize a microfluidic culture system capable of rapid switching of local oxygen concentrations to determine changes in drug resistance in prostate cancer cells. We observed rapid adaptation to hypoxia, with drug resistance to 2 μM staurosporine established within 30 min of hypoxia. Annexin-V/Sytox Green apoptosis assays over 9 h showed 78.0% viability, compared to 84.5% viability in control cells (normoxic cells with no staurosporine). Normoxic cells exposed to the same staurosporine concentration had a viability of 48.6% after 9 h. Hypoxia adaptation was rapid and reversible, with Hypoxic cells treated with 20% oxygen for 30 min responding to staurosporine with 51.6% viability after drug treatment for 9 h. Induction of apoptosis through the receptor-mediated pathway, which bypasses anti-apoptosis mechanisms induced by hypoxia, resulted in 39.4 ± 7% cell viability. The rapid reversibility indicates co-treatment of oxygen with anti-cancer compounds may be a potential therapeutic target.
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31
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A review of chemical gradient systems for cell analysis. Anal Chim Acta 2016; 907:7-17. [DOI: 10.1016/j.aca.2015.12.008] [Citation(s) in RCA: 75] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2015] [Revised: 12/01/2015] [Accepted: 12/12/2015] [Indexed: 01/22/2023]
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32
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Aung A, Bhullar IS, Theprungsirikul J, Davey SK, Lim HL, Chiu YJ, Ma X, Dewan S, Lo YH, McCulloch A, Varghese S. 3D cardiac μtissues within a microfluidic device with real-time contractile stress readout. LAB ON A CHIP 2016; 16:153-62. [PMID: 26588203 PMCID: PMC4681661 DOI: 10.1039/c5lc00820d] [Citation(s) in RCA: 42] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
We present the development of three-dimensional (3D) cardiac microtissues within a microfluidic device with the ability to quantify real-time contractile stress measurements in situ. Using a 3D patterning technology that allows for the precise spatial distribution of cells within the device, we created an array of 3D cardiac microtissues from neonatal mouse cardiomyocytes. We integrated the 3D micropatterning technology with microfluidics to achieve perfused cell-laden structures. The cells were encapsulated within a degradable gelatin methacrylate hydrogel, which was sandwiched between two polyacrylamide hydrogels. The polyacrylamide hydrogels were used as "stress sensors" to acquire the contractile stresses generated by the beating cardiac cells. The cardiac-specific response of the engineered 3D system was examined by exposing it to epinephrine, an adrenergic neurotransmitter known to increase the magnitude and frequency of cardiac contractions. In response to exogenous epinephrine the engineered cardiac tissues exhibited an increased beating frequency and stress magnitude. Such cost-effective and easy-to-adapt 3D cardiac systems with real-time functional readout could be an attractive technological platform for drug discovery and development.
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Affiliation(s)
- Aereas Aung
- Department of Bioengineering, University of California-San Diego, La Jolla, CA, USA.
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33
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Severe Hyperhomocysteinemia Decreases Respiratory Enzyme and Na(+)-K(+) ATPase Activities, and Leads to Mitochondrial Alterations in Rat Amygdala. Neurotox Res 2015; 29:408-18. [PMID: 26694914 DOI: 10.1007/s12640-015-9587-z] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2015] [Revised: 11/13/2015] [Accepted: 12/08/2015] [Indexed: 12/19/2022]
Abstract
Severe hyperhomocysteinemia is caused by increased plasma levels of homocysteine (Hcy), a methionine derivative, and is associated with cerebral disorders. Creatine supplementation has emerged as an adjuvant to protect against neurodegenerative diseases, due to its potential antioxidant role. Here, we examined the effects of severe hyperhomocysteinemia on brain metabolism, and evaluated a possible neuroprotective role of creatine in hyperhomocysteinemia, by concomitant treatment with Hcy and creatine (50 mg/Kg body weight). Hyperhomocysteinemia was induced in young rats (6-day-old) by treatment with homocysteine (0.3-0.6 µmol/g body weight) for 23 days, and then the following parameters of rat amygdala were evaluated: (1) the activity of the respiratory chain complexes succinate dehydrogenase, complex II and cytochrome c oxidase; (2) mitochondrial mass and membrane potential; (3) the levels of necrosis and apoptosis; and (4) the activity and immunocontent of Na(+),K(+)-ATPase. Hcy treatment decreased the activities of succinate dehydrogenase and cytochrome c oxidase, but did not alter complex II activity. Hcy treatment also increased the number of cells with high mitochondrial mass, high mitochondrial membrane potential, and in late apoptosis. Importantly, creatine administration prevented some of the key effects of Hcy administration on the amygdala. We also observed a decrease in the activity and immunocontent of the α1 subunit of the Na(+),K(+)-ATPase in amygdala after Hcy- treatment. Our findings support the notion that Hcy modulates mitochondrial function and bioenergetics in the brain, as well as Na(+),K(+)-ATPase activity, and suggest that creatine might represent an effective adjuvant to protect against the effects of high Hcy plasma levels.
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34
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Recent advances and future applications of microfluidic live-cell microarrays. Biotechnol Adv 2015; 33:948-61. [DOI: 10.1016/j.biotechadv.2015.06.006] [Citation(s) in RCA: 48] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2015] [Revised: 06/16/2015] [Accepted: 06/19/2015] [Indexed: 12/31/2022]
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35
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Mitochondrial and Oxidative Stress Aspects in Hippocampus of Rats Submitted to Dietary n-3 Polyunsaturated Fatty Acid Deficiency After Exposure to Early Stress. Neurochem Res 2015; 40:1870-81. [DOI: 10.1007/s11064-015-1679-x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2015] [Revised: 07/05/2015] [Accepted: 07/22/2015] [Indexed: 10/23/2022]
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36
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Bhatia SN, Ingber DE. Microfluidic organs-on-chips. Nat Biotechnol 2015; 32:760-72. [PMID: 25093883 DOI: 10.1038/nbt.2989] [Citation(s) in RCA: 1945] [Impact Index Per Article: 216.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2014] [Accepted: 07/10/2014] [Indexed: 02/07/2023]
Abstract
An organ-on-a-chip is a microfluidic cell culture device created with microchip manufacturing methods that contains continuously perfused chambers inhabited by living cells arranged to simulate tissue- and organ-level physiology. By recapitulating the multicellular architectures, tissue-tissue interfaces, physicochemical microenvironments and vascular perfusion of the body, these devices produce levels of tissue and organ functionality not possible with conventional 2D or 3D culture systems. They also enable high-resolution, real-time imaging and in vitro analysis of biochemical, genetic and metabolic activities of living cells in a functional tissue and organ context. This technology has great potential to advance the study of tissue development, organ physiology and disease etiology. In the context of drug discovery and development, it should be especially valuable for the study of molecular mechanisms of action, prioritization of lead candidates, toxicity testing and biomarker identification.
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Affiliation(s)
- Sangeeta N Bhatia
- 1] Department of Electrical Engineering &Computer Science, Koch Institute and Institute for Medical Engineering and Science, Massachusetts Institute of Technology and Broad Institute, Cambridge, Massachusetts, USA. [2] Department of Medicine, Brigham and Women's Hospital, Boston, Massachusetts, USA
| | - Donald E Ingber
- 1] Wyss Institute for Biologically Inspired Engineering at Harvard University, Boston, Massachusetts, USA. [2] Vascular Biology Program, Departments of Pathology &Surgery, Boston Children's Hospital and Harvard Medical School, Boston, Massachusetts, USA. [3] School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts, USA
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37
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Somaweera H, Haputhanthri SO, Ibraguimov A, Pappas D. On-chip gradient generation in 256 microfluidic cell cultures: simulation and experimental validation. Analyst 2015; 140:5029-38. [DOI: 10.1039/c5an00481k] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
A microfluidic diffusion diluter was used to create a stable concentration gradient for dose response studies.
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Affiliation(s)
- Himali Somaweera
- Department of Chemistry and Biochemistry
- Texas Tech University
- Lubbock
- USA
| | | | - Akif Ibraguimov
- Department of Mathematics and Statistics
- Texas Tech University
- Lubbock
- USA
| | - Dimitri Pappas
- Department of Chemistry and Biochemistry
- Texas Tech University
- Lubbock
- USA
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38
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Khanal G, Somaweera H, Dong M, Germain T, Ansari M, Pappas D. Detection of apoptosis using fluorescent probes. Methods Mol Biol 2015; 1292:151-161. [PMID: 25804754 DOI: 10.1007/978-1-4939-2522-3_11] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Apoptosis plays a major role in both healthy and diseased cells. The analysis of apoptosis can take advantage of multiple cellular markers, enabling the process to be studied at different time points. In this chapter, several apoptosis assay protocols are provided.
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Affiliation(s)
- Grishma Khanal
- Department of Chemistry and Biochemistry, Texas Tech University, 41061, Lubbock, TX, 79409, USA
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39
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Microfluidic antibody arrays for simultaneous cell separation and stimulus. Anal Bioanal Chem 2014; 406:7867-73. [PMID: 25354890 DOI: 10.1007/s00216-014-8244-3] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2014] [Revised: 09/29/2014] [Accepted: 10/06/2014] [Indexed: 01/09/2023]
Abstract
A microfluidic chip containing stamped antibody arrays was developed for simultaneous cell separation and drug testing. Poly(dimethyl siloxane) (PDMS) stamping was used to deposit antibodies in a microfluidic channel, forming discrete cell-capture regions on the surface. Cell mixtures were then introduced, resulting in the separation of cells when specific antibodies were used. Anti-CD19 antibody regions resulted in 94 % capture purity for CD19+ Ramos cells. An antibody that captures multiple cell types, for example anti-CD71, can also be used to capture several cell types simultaneously. Cells could also be loaded onto the arrays with spatial control using laminar streams. Both Ramos B cells and HuT 78 T cells were isolated in the chip and exposed to staurosporine in the same channel. Both cell lines had similar responses to the drug, with 2-10 % of cells remaining viable after 20 h of drug treatment, depending on cell type. The chip can also be used to analyze the efficacy of antibody therapy against cancer cells. Anti-CD95 was deposited on the surface and used for simultaneous cell capture and apoptosis induction via the extrinsic pathway. Cells captured on anti-CD95 surfaces had significant viability loss (15 % viability after 24 h) when compared with a control anti-CD71 antibody (81 % viability after 24 h). This chip can be used for a variety of cell separation and/or drug testing studies, enabling researchers to isolate cells and test them against different anti-cancer compounds and to follow cell response using fluorescence or other readout methods.
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40
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Acosta MA, Jiang X, Huang PK, Cutler KB, Grant CS, Walker GM, Gamcsik MP. A microfluidic device to study cancer metastasis under chronic and intermittent hypoxia. BIOMICROFLUIDICS 2014; 8:054117. [PMID: 25584114 PMCID: PMC4290574 DOI: 10.1063/1.4898788] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/02/2014] [Accepted: 10/08/2014] [Indexed: 05/12/2023]
Abstract
Metastatic cancer cells must traverse a microenvironment ranging from extremely hypoxic, within the tumor, to highly oxygenated, within the host's vasculature. Tumor hypoxia can be further characterized by regions of both chronic and intermittent hypoxia. We present the design and characterization of a microfluidic device that can simultaneously mimic the oxygenation conditions observed within the tumor and model the cell migration and intravasation processes. This device can generate spatial oxygen gradients of chronic hypoxia and produce dynamically changing hypoxic microenvironments in long-term culture of cancer cells.
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Affiliation(s)
- Miguel A Acosta
- UNC/NCSU Joint Department of Biomedical Engineering, North Carolina State University , 4206D Engineering Building III, 911 Oval Drive, Raleigh, North Carolina 27695-7115, USA
| | - Xiao Jiang
- UNC/NCSU Joint Department of Biomedical Engineering, North Carolina State University , 4206D Engineering Building III, 911 Oval Drive, Raleigh, North Carolina 27695-7115, USA
| | - Pin-Kang Huang
- Department of Chemical Engineering, National Taiwan University of Science and Technology , No. 43, Sec. 4, Keelung Road, Da'an District, Taipei City 106, Taiwan
| | - Kyle B Cutler
- Department of Biomedical Engineering, Beckman Laser Institute, University of California Irvine , 1002 Health Services Road, Irvine, California 92617, USA
| | - Christine S Grant
- UNC/NCSU Joint Department of Biomedical Engineering, North Carolina State University , 4206D Engineering Building III, 911 Oval Drive, Raleigh, North Carolina 27695-7115, USA
| | - Glenn M Walker
- UNC/NCSU Joint Department of Biomedical Engineering, North Carolina State University , 4206D Engineering Building III, 911 Oval Drive, Raleigh, North Carolina 27695-7115, USA
| | - Michael P Gamcsik
- Department of Chemical Engineering, National Taiwan University of Science and Technology , No. 43, Sec. 4, Keelung Road, Da'an District, Taipei City 106, Taiwan
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Khanal G, Hiemstra S, Pappas D. Probing hypoxia-induced staurosporine resistance in prostate cancer cells with a microfluidic culture system. Analyst 2014; 139:3274-80. [PMID: 24479128 PMCID: PMC4043951 DOI: 10.1039/c3an02324a] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
A microfluidic system for cell culture and drug response studies was developed to elucidate the effects of hypoxia on drug susceptibility. Drug response studies were performed in prostate cancer cells and Ramos B cells under normoxic and hypoxic conditions. A vacuum actuated microfluidic culture device was used for cell culture and PC3 cells were cultured in the chip up to 16 hours. Cells were treated with several concentrations of staurosporine and apoptosis was assayed using the fluorescent probes MitoTracker Deep Red and Annexin-V. For hypoxic samples, the chip was placed in a hypoxia chamber and pre-conditioned at <1% oxygen before inducing the cells with staurosporine. Cells exposed to 2 μM staurosporine were 32% ± 10% apoptotic under normoxic conditions but only 1.5% ± 12% apoptotic under hypoxic conditions. As little as 1 hour of hypoxic preconditioning increased drug resistance. Cell apoptosis correlated with drug dose, although in each case hypoxia reduced the apoptotic fraction significantly. Given the rapid nature of cell adaptation to hypoxia, this chip and analysis approach can be used to identify compounds that can induce cell death in hypoxic tumor cells rapidly.
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Affiliation(s)
- Grishma Khanal
- Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, TX 79409-1061, USA.
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42
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Mosadegh B, Dabiri BE, Lockett MR, Derda R, Campbell P, Parker KK, Whitesides GM. Three-dimensional paper-based model for cardiac ischemia. Adv Healthc Mater 2014; 3:1036-43. [PMID: 24574054 PMCID: PMC4107065 DOI: 10.1002/adhm.201300575] [Citation(s) in RCA: 97] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2013] [Revised: 12/26/2013] [Indexed: 12/29/2022]
Abstract
In vitro models of ischemia have not historically recapitulated the cellular interactions and gradients of molecules that occur in a 3D tissue. This work demonstrates a paper-based 3D culture system that mimics some of the interactions that occur among populations of cells in the heart during ischemia. Multiple layers of paper containing cells, suspended in hydrogels, are stacked to form a layered 3D model of a tissue. Mass transport of oxygen and glucose into this 3D system can be modulated to induce an ischemic environment in the bottom layers of the stack. This ischemic stress induces cardiomyocytes at the bottom of the stack to secrete chemokines which subsequently trigger fibroblasts residing in adjacent layers to migrate toward the ischemic region. This work demonstrates the usefulness of patterned, stacked paper for performing in vitro mechanistic studies of cellular motility and viability within a model of the laminar ventricle tissue of the heart.
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Affiliation(s)
- Bobak Mosadegh
- Department of Chemistry and Chemical Biology, Harvard University, 12 Oxford Street, Cambridge, MA 02138, USA
- Wyss Institute for Biologically Inspired Engineering, Harvard University, 60 Oxford Street, Cambridge, MA 02138, USA
| | - Borna E. Dabiri
- Wyss Institute for Biologically Inspired Engineering, Harvard University, 60 Oxford Street, Cambridge, MA 02138, USA
- Disease Biophysics Group, Harvard School of Engineering and Applied Sciences, Cambridge, MA 02138, USA
| | - Matthew R. Lockett
- Department of Chemistry and Chemical Biology, Harvard University, 12 Oxford Street, Cambridge, MA 02138, USA
| | - Ratmir Derda
- Department of Chemistry and Chemical Biology, Harvard University, 12 Oxford Street, Cambridge, MA 02138, USA
- Wyss Institute for Biologically Inspired Engineering, Harvard University, 60 Oxford Street, Cambridge, MA 02138, USA
| | - Patrick Campbell
- Disease Biophysics Group, Harvard School of Engineering and Applied Sciences, Cambridge, MA 02138, USA
| | - Kevin Kit Parker
- Wyss Institute for Biologically Inspired Engineering, Harvard University, 60 Oxford Street, Cambridge, MA 02138, USA
- Disease Biophysics Group, Harvard School of Engineering and Applied Sciences, Cambridge, MA 02138, USA
| | - George M. Whitesides
- Department of Chemistry and Chemical Biology, Harvard University, 12 Oxford Street, Cambridge, MA 02138, USA
- Wyss Institute for Biologically Inspired Engineering, Harvard University, 60 Oxford Street, Cambridge, MA 02138, USA
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Gao Y, Li P, Pappas D. A microfluidic localized, multiple cell culture array using vacuum actuated cell seeding: integrated anticancer drug testing. Biomed Microdevices 2014; 15:907-15. [PMID: 23813077 DOI: 10.1007/s10544-013-9779-3] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
In this study, we introduced a novel and convenient approach to culture multiple cells in localized arrays of microfluidic chambers using one-step vacuum actuation. In one device, we integrated 8 individually addressable regions of culture chambers, each only requiring one simple vacuum operation to seed cell lines. Four cell lines were seeded in designated regions in one device via sequential injection with high purity (99.9 %-100 %) and cultured for long-term. The on-chip simultaneous culture of HuT 78, Ramos, PC-3 and C166-GFP cells for 48 h was demonstrated with viabilities of 92 %+/-2 %, 94 %+/-4 %, 96 %+/-2 % and 97 %+/-2 %, respectively. The longest culture period for C166-GFP cells in this study was 168 h with a viability of 96 %+/-10 %. Cell proliferation in each individual side channel can be tracked. Mass transport between the main channel and side channels was achieved through diffusion and studied using fluorescein solution. The main advantage of this device is the capability to perform multiple cell-based assays on the same device for better comparative studies. After treating cells with staurosporine or anti-human CD95 for 16 h, the apoptotic cell percentage of HuT 78, CCRF-CEM, PC-3 and Ramos cells were 36 %+/-3 %, 24 %+/-4 %, 12 %+/-2 %, 18 %+/-4 % for staurosporine, and 63 %+/-2 %, 45 %+/-1 %, 3 %+/-3 %, 27 %+/-12 % for anti-human CD95, respectively. With the advantages of enhanced integration, ease of use and fabrication, and flexibility, this device will be suitable for long-term multiple cell monitoring and cell based assays.
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Affiliation(s)
- Yan Gao
- Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, TX, 79409, USA
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Somaweera H, Ibragimov A, Pappas D. Generation of a chemical gradient across an array of 256 cell cultures in a single chip. Analyst 2014; 138:5566-71. [PMID: 23939026 DOI: 10.1039/c3an00946g] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
A microfluidic diffusion diluter to create stable chemical gradients across an array of cell cultures was demonstrated. The device enabled concentration based studies to be conducted at 256 different concentrations across individual, low shear cell cultures. A gradient of staurosporine on cells stained with Mitotracker Deep Red (MTDR) showed a concentration-based effect on cell apoptosis across the cell culture array.
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Affiliation(s)
- Himali Somaweera
- Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, TX 79409, USA.
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Liu Y, Butler WB, Pappas D. Spatially selective reagent delivery into cancer cells using a two-layer microfluidic culture system. Anal Chim Acta 2012; 743:125-30. [PMID: 22882832 PMCID: PMC3439837 DOI: 10.1016/j.aca.2012.06.054] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2012] [Revised: 06/25/2012] [Accepted: 06/29/2012] [Indexed: 12/31/2022]
Abstract
In this work, we demonstrate a two-layer microfluidic system capable of spatially selective delivery of drugs and other reagents under low shear stress. Loading occurs by hydrodynamically focusing a reagent stream over a particular region of the cell culture. The system consisted of a cell culture chamber and fluid flow channel, which were located in different layers to reduce shear stress on cells. Cells in the center of the culture chamber were exposed to parallel streams of laminar flow, which allowed fast changes to be made to the cellular environment. The shear force was reduced to 2.7 dyn cm(-2) in the two-layer device (vs. 6.0 dyn cm(-2) in a one-layer device). Cells in the side of the culture chamber were exposed to the side streams of buffer; the shear force was further reduced to a greater extent since the sides of the culture chamber were separated from the main fluid path. The channel shape and flow rate of the multiple streams were optimized for spatially controlled reagent delivery. The boundaries between streams were well controlled at a flow rate of 0.1 mL h(-1), which was optimized for all streams. We demonstrated multi-reagent delivery to different regions of the same culture well, as well as selective treatment of cancer cells with a built in control group in the same well. In the case of apoptosis induction using staurosporine, 10% of cells remained viable after 24 h of exposure. Cells in the same chamber, but not exposed to staurosporine, had a viability of 90%. This chip allows dynamic observation of cellular behavior immediately after drug delivery, as well as long-term drug treatment with the benefit of large cell numbers, device simplicity, and low shear stress.
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Affiliation(s)
- Yan Liu
- Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, TX 79409
| | - W. Boyd Butler
- Department of Biological Sciences, Texas Tech University, Lubbock, TX 79409
| | - Dimitri Pappas
- Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, TX 79409
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Morris CE, Juranka PF, Joós B. Perturbed voltage-gated channel activity in perturbed bilayers: implications for ectopic arrhythmias arising from damaged membrane. PROGRESS IN BIOPHYSICS AND MOLECULAR BIOLOGY 2012; 110:245-56. [PMID: 22846437 DOI: 10.1016/j.pbiomolbio.2012.07.003] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/10/2012] [Accepted: 07/11/2012] [Indexed: 12/31/2022]
Abstract
The ceaseless opening and closing of the voltage-gated channels (VGCs) underlying cardiac rhythmicity is controlled, in each VGC, by four mobile voltage sensors embedded in bilayer. Every action potential necessitates extensive packing/repacking of voltage sensor domains with adjacent interacting lipid molecules. This renders VGC activity mechanosensitive (MS), i.e., energetically sensitive to the bilayer's mechanical state. Irreversible perturbations of sarcolemmal bilayer such as those associated with ischemia, reperfusion, inflammation, cortical-cytoskeleton abnormalities, bilayer-disrupting toxins, diet aberrations, etc, should therefore perturb VGC activity. Disordered/fluidized bilayer states that facilitate voltage sensor repacking, and thus make VGC opening too easy could, therefore, explain VGC-leakiness in these conditions. To study this in membrane patches we impose mechanical blebbing injury during pipette aspiration-induced membrane stretch, a process that modulates VGC activity irreversibly (plastic regime) and then, eventually, reversibly (elastic regime). Because of differences in sensor-to-gate coupling among different VGCs, their responses to stretch fall into two major categories, MS-Speed, MS-Number, exemplified by Nav and Cav channels. For particular VGCs in perturbed bilayers, leak mechanisms depend on whether or not the rate-limiting voltage-dependent step is MS. Mode-switch transitions might also be mechanosensitive and thus play a role. Incorporated mathematically in axon models, plastic-regime Nav responses elicit ectopic firing behaviors typical of peripheral neuropathies. In cardiomyocytes with mild bleb damage, Nav and/or Cav leaks from irreversible MS modulation (MS-Speed, MS-Number, respectively) could, similarly, foster ectopic arrhythmias. Where pathologically leaky VGCs reside in damaged bilayer, peri-channel bilayer disorder/fluidity conditions could be an important "target feature" for anti-arrhythmic VGC drugs.
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Moffitt JR, Lee JB, Cluzel P. The single-cell chemostat: an agarose-based, microfluidic device for high-throughput, single-cell studies of bacteria and bacterial communities. LAB ON A CHIP 2012; 12:1487-94. [PMID: 22395180 PMCID: PMC3646658 DOI: 10.1039/c2lc00009a] [Citation(s) in RCA: 99] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/09/2023]
Abstract
Optical microscopy of single bacteria growing on solid agarose support is a powerful method for studying the natural heterogeneity in growth and gene expression. While the material properties of agarose make it an excellent substrate for such studies, the sheer number of exponentially growing cells eventually overwhelms the agarose pad, which fundamentally limits the duration and the throughput of measurements. Here we overcome the limitations of exponential growth by patterning agarose pads on the sub-micron-scale. Linear tracks constrain the growth of bacteria into a high density array of linear micro-colonies. Buffer flow through microfluidic lines washes away excess cells and delivers fresh nutrient buffer. Densely patterned tracks allow us to cultivate and image hundreds of thousands of cells on a single agarose pad over 30-40 generations, which drastically increases single-cell measurement throughput. In addition, we show that patterned agarose can facilitate single-cell measurements within bacterial communities. As a proof-of-principle, we study a community of E. coli auxotrophs that can complement the amino acid deficiencies of one another. We find that the growth rate of colonies of one strain decreases sharply with the distance to colonies of the complementary strain over distances of only a few cell lengths. Because patterned agarose pads maintain cells in a chemostatic environment in which every cell can be imaged, we term our device the single-cell chemostat. High-throughput measurements of single cells growing chemostatically should greatly facilitate the study of a variety of microbial behaviours.
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48
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Neonatal hypoxia–ischemia induces sex-related changes in rat brain mitochondria. Mitochondrion 2012; 12:271-9. [DOI: 10.1016/j.mito.2011.10.002] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2011] [Revised: 10/10/2011] [Accepted: 10/17/2011] [Indexed: 12/13/2022]
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Morris CE, Boucher PA, Joós B. Left-shifted nav channels in injured bilayer: primary targets for neuroprotective nav antagonists? Front Pharmacol 2012; 3:19. [PMID: 22375118 PMCID: PMC3284691 DOI: 10.3389/fphar.2012.00019] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2011] [Accepted: 02/06/2012] [Indexed: 12/26/2022] Open
Abstract
Mechanical, ischemic, and inflammatory injuries to voltage-gated sodium channel (Nav)-rich membranes of axon initial segments and nodes of Ranvier render Nav channels dangerously leaky. By what means? The behavior of recombinant Nav1.6 (Wang et al., 2009) leads us to postulate that, in neuropathologic conditions, structural degradation of axolemmal bilayer fosters chronically left-shifted Nav channel operation, resulting in E(Na) rundown. This "sick excitable cell Nav-leak" would encompass left-shifted fast- and slow-mode based persistent I(Na) (i.e., I(window) and slow-inactivating I(Na)). Bilayer-damage-induced electrophysiological dysfunctions of native-Nav channels, and effects on inhibitors on those channels, should, we suggest, be studied in myelinated axons, exploiting I(Na)(V,t) hysteresis data from sawtooth ramp clamp. We hypothesize that (like dihydropyridines for Ca channels), protective lipophilic Nav antagonists would partition more avidly into disorderly bilayers than into the well-packed bilayers characteristic of undamaged, healthy plasma membrane. Whereas inhibitors using aqueous routes would access all Navs equally, differential partitioning into "sick bilayer" would co-localize lipophilic antagonists with "sick-Nav channels," allowing for more specific targeting of impaired cells. Molecular fine-tuning of Nav antagonists to favor more avid partitioning into damaged than into intact bilayers could reduce side effects. In potentially salvageable neurons of traumatic and/or ischemic penumbras, in inflammatory neuropathies, in muscular dystrophy, in myocytes of cardiac infarct borders, Nav-leak driven excitotoxicity overwhelms cellular repair mechanisms. Precision-tuning of a lipophilic Nav antagonist for greatest efficacy in mildly damaged membranes could render it suitable for the prolonged continuous administration needed to allow for the remodeling of the excitable membranes, and thus functional recovery.
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Dong M, Martinez MM, Mayer MF, Pappas D. Single molecule fluorescence correlation spectroscopy of single apoptotic cells using a red-fluorescent caspase probe. Analyst 2012; 137:2997-3003. [PMID: 22314869 DOI: 10.1039/c2an16173g] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
The detection of single molecules in single cells has enabled biochemical analyses to be conducted with high sensitivity and high temporal resolution. In this work, detection of apoptosis was studied by single molecule fluorescence correlation spectroscopy (FCS) in single living cells. Caspase activity was assayed using a new red fluorogenic probe that avoids the spectral overlap of green fluorescent probes and cell autofluorescence. This new probe, 2SBPO-Casp, was synthesized by coupling a water-soluble Nile Blue derivative (2SBPO) to an aspartic acid residue. Upon apoptosis induction and caspase activation, free 2SBPO dye is shown to accumulate inside the cell after probe cleavage. In previous work in our lab, single molecule fluorescence in single apoptotic cells was detected 45 min after induction using a rhodamine 110-based probe. However, significant statistical analysis was needed to exclude false positives. The use of 2SBPO-Casp overcomes the autofluorescence problem and offers a steady fluorescence signal. In our single molecule FCS measurements, Ramos cells were determined apoptotic on the basis of their correlation coefficient value (R(2)). Cells that contain an R(2) ≥ 0.65 were identified as highly correlated and therefore determined to be apoptotic. Single apoptotic cells identified in this manner were found as early as 30 min after induction and the number of apoptotic cells reached a peak value at the 3rd hour, which is consistent with other techniques. Using single molecule techniques and a new apoptosis probe, the temporal dynamics were elucidated with better sensitivity and resolution than in previous studies.
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Affiliation(s)
- Meicong Dong
- Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, TX 79409, USA
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