1
|
Hellmann A, Klein S, Hesselmann F, Djeljadini S, Schmitz‐Rode T, Jockenhoevel S, Cornelissen CG, Thiebes AL. EndOxy: Mid‐term stability and shear stress resistance of endothelial cells on PDMS gas exchange membranes. Artif Organs 2020; 44:E419-E433. [DOI: 10.1111/aor.13712] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2019] [Revised: 03/10/2020] [Accepted: 04/16/2020] [Indexed: 01/01/2023]
Affiliation(s)
- Ariane Hellmann
- Department of Biohybrid & Medical Textiles (BioTex) AME – Institute of Applied Medical Engineering Helmholtz Institute RWTH Aachen University Aachen Germany
| | - Sarah Klein
- Department of Biohybrid & Medical Textiles (BioTex) AME – Institute of Applied Medical Engineering Helmholtz Institute RWTH Aachen University Aachen Germany
- Faculty of Science and Engineering Aachen‐Maastricht Institute for Biobased Materials Maastricht University Geleen The Netherlands
| | - Felix Hesselmann
- Department of Cardiovascular Engineering (CVE) AME – Institute of Applied Medical Engineering Helmholtz Institute RWTH Aachen University Aachen Germany
| | | | - Thomas Schmitz‐Rode
- Department of Biohybrid & Medical Textiles (BioTex) AME – Institute of Applied Medical Engineering Helmholtz Institute RWTH Aachen University Aachen Germany
| | - Stefan Jockenhoevel
- Department of Biohybrid & Medical Textiles (BioTex) AME – Institute of Applied Medical Engineering Helmholtz Institute RWTH Aachen University Aachen Germany
- Faculty of Science and Engineering Aachen‐Maastricht Institute for Biobased Materials Maastricht University Geleen The Netherlands
| | - Christian G. Cornelissen
- Department of Biohybrid & Medical Textiles (BioTex) AME – Institute of Applied Medical Engineering Helmholtz Institute RWTH Aachen University Aachen Germany
- Clinic for Pneumology and Internistic Intensive Medicine (Medical Clinic V) University Hospital Aachen Aachen Germany
| | - Anja Lena Thiebes
- Department of Biohybrid & Medical Textiles (BioTex) AME – Institute of Applied Medical Engineering Helmholtz Institute RWTH Aachen University Aachen Germany
- Faculty of Science and Engineering Aachen‐Maastricht Institute for Biobased Materials Maastricht University Geleen The Netherlands
| |
Collapse
|
2
|
Patel DB, Luthers CR, Lerman MJ, Fisher JP, Jay SM. Enhanced extracellular vesicle production and ethanol-mediated vascularization bioactivity via a 3D-printed scaffold-perfusion bioreactor system. Acta Biomater 2019; 95:236-244. [PMID: 30471476 DOI: 10.1016/j.actbio.2018.11.024] [Citation(s) in RCA: 75] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2018] [Revised: 11/12/2018] [Accepted: 11/15/2018] [Indexed: 01/08/2023]
Abstract
Extracellular vesicles (EVs) have garnered significant interest in the biotechnology field due to their intrinsic therapeutic properties as well as their ability to serve as vehicles for bioactive cargo. However, the lack of an established biomanufacturing platform and limited potency of EVs in vivo remain critical bottlenecks for clinical translation. In this study, we utilized a 3D-printed scaffold-perfusion bioreactor system to assess the response of dynamic culture on extracellular vesicle production from endothelial cells (ECs). We also investigated whether ethanol conditioning, which was previously shown to enhance vascularization bioactivity of EC-derived EVs produced in standard 2D culture conditions, could be employed successfully for the same purpose in a 3D production system. Our results indicate that dynamic culture in a perfusion bioreactor significantly enhances EV production from human ECs. Moreover, the use of ethanol conditioning in conjunction with dynamic culture induces pro-vascularization bioactivity of EC-derived EVs that is correlated with increased EV levels of pro-angiogenic lncRNAs HOTAIR and MALAT1. Thus, this study represents one of the first reports of rationally-designed EV potency enhancement that is conserved between static 2D and dynamic 3D EV production systems, increasing the potential for scalable biomanufacturing of therapeutic EC-derived EVs for a variety of applications. STATEMENT OF SIGNIFICANCE: Extracellular vesicles (EVs) have substantial therapeutic potential in a variety of applications. However, translation of EV-based therapies may be hindered by biomanufacturing challenges. EV production to date has predominantly involved the use of tissue culture flasks. Here, we report, for the first time, the use of a tubular perfusion bioreactor system with an integrated 3D-printed biomaterial scaffold for EV production from human endothelial cells. This system increases EV yield by over 100-fold compared to conventional tissue culture systems. Further, we show that an ethanol-conditioning approach that our group previously developed in 2D culture for enhancing EV potency is compatible with this new system. Thus, potency enhancement of EVs for vascularization applications is possible even with significantly increased production rate.
Collapse
Affiliation(s)
- Divya B Patel
- Fischell Department of Bioengineering, University of Maryland 3102 A. James Clark Hall, College Park, MD 20742, United States
| | - Christopher R Luthers
- Fischell Department of Bioengineering, University of Maryland 3102 A. James Clark Hall, College Park, MD 20742, United States
| | - Max J Lerman
- Department of Materials Science and Engineering, University of Maryland 4418 Stadium Drive, College Park, MD 20742, United States; Center for Engineering Complex Tissues, University of Maryland 3102 A. James Clark Hall, College Park, MD 20742, United States; Surface and Trace Chemical Analysis Group, Materials Measurement Science Division National Institute of Standards and Technology 100 Bureau Drive, Mailstop 6431, Gaithersburg, MD 20899, United States
| | - John P Fisher
- Fischell Department of Bioengineering, University of Maryland 3102 A. James Clark Hall, College Park, MD 20742, United States; Center for Engineering Complex Tissues, University of Maryland 3102 A. James Clark Hall, College Park, MD 20742, United States
| | - Steven M Jay
- Fischell Department of Bioengineering, University of Maryland 3102 A. James Clark Hall, College Park, MD 20742, United States; Greenbaum Comprehensive Cancer Center, University of Maryland - Baltimore, Baltimore, MD 21201, United States; Program in Molecular and Cell Biology, University of Maryland College Park, MD 20742, United States.
| |
Collapse
|
3
|
Vanchin B, Offringa E, Friedrich J, Brinker MG, Kiers B, Pereira AC, Harmsen MC, Moonen JRA, Krenning G. MicroRNA-374b induces endothelial-to-mesenchymal transition and early lesion formation through the inhibition of MAPK7 signaling. J Pathol 2019; 247:456-470. [PMID: 30565701 PMCID: PMC6590197 DOI: 10.1002/path.5204] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2018] [Revised: 11/13/2018] [Accepted: 11/15/2018] [Indexed: 01/21/2023]
Abstract
Endothelial–mesenchymal transition occurs during intimal hyperplasia and neointima formation via mechanisms that are incompletely understood. Endothelial MAPK7 signaling is a key mechanosensitive factor that protects against endothelial–mesenchymal transition, but its signaling activity is lost in vessel areas that are undergoing pathological remodeling. At sites of vascular remodeling in mice and pigs, endothelial MAPK7 signaling was lost. The TGFβ‐induced microRNA‐374b targets MAPK7 and its downstream effectors in endothelial cells, and its expression induces endothelial–mesenchymal transition. Gain‐of‐function experiments, where endothelial MAPK7 signaling was restored, precluded endothelial–mesenchymal transition. In human coronary artery disease, disease severity is associated with decreased MAPK7 expression levels and increased miR‐374b expression levels. Endothelial–mesenchymal transition occurs in intimal hyperplasia and early lesion formation and is governed in part by microRNA‐374b‐induced silencing of MAPK7 signaling. Restoration of MAPK7 signaling abrogated these pathological effects in endothelial cells expressing miR‐374b. Thus, our data suggest that the TGFβ‐miR‐374b‐MAPK7 axis plays a key role in the induction of endothelial–mesenchymal transition during intimal hyperplasia and early lesion formation and might pose an interesting target for antiatherosclerosis therapy. © 2018 The Authors. The Journal of Pathology published by John Wiley & Sons Ltd on behalf of Pathological Society of Great Britain and Ireland.
Collapse
Affiliation(s)
- Byambasuren Vanchin
- Department Pathology and Medical Biology, Laboratory for Cardiovascular Regenerative Medicine (CAVAREM), University of Groningen, University Medical Center Groningen, Groningen, The Netherlands
| | - Emma Offringa
- Department Pathology and Medical Biology, Laboratory for Cardiovascular Regenerative Medicine (CAVAREM), University of Groningen, University Medical Center Groningen, Groningen, The Netherlands
| | - Julian Friedrich
- Department Pathology and Medical Biology, Laboratory for Cardiovascular Regenerative Medicine (CAVAREM), University of Groningen, University Medical Center Groningen, Groningen, The Netherlands.,Department Endocrinology, 5th Medical Clinic, Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany
| | - Marja Gl Brinker
- Department Pathology and Medical Biology, Laboratory for Cardiovascular Regenerative Medicine (CAVAREM), University of Groningen, University Medical Center Groningen, Groningen, The Netherlands
| | - Bianca Kiers
- Laboratory of Genetics and Molecular Cardiology (LIM13), University of São Paulo, Heart Institute (InCor), São Paulo, SP, Brazil
| | - Alexandre C Pereira
- Laboratory of Genetics and Molecular Cardiology (LIM13), University of São Paulo, Heart Institute (InCor), São Paulo, SP, Brazil
| | - Martin C Harmsen
- Department Pathology and Medical Biology, Laboratory for Cardiovascular Regenerative Medicine (CAVAREM), University of Groningen, University Medical Center Groningen, Groningen, The Netherlands
| | - Jan-Renier Aj Moonen
- Department Pathology and Medical Biology, Laboratory for Cardiovascular Regenerative Medicine (CAVAREM), University of Groningen, University Medical Center Groningen, Groningen, The Netherlands.,Stanford University School of Medicine, Vera Moulton Wall Center for Pulmonary Vascular Disease and the Cardiovascular Institute, Stanford, CA, USA
| | - Guido Krenning
- Department Pathology and Medical Biology, Laboratory for Cardiovascular Regenerative Medicine (CAVAREM), University of Groningen, University Medical Center Groningen, Groningen, The Netherlands
| |
Collapse
|
4
|
Full Mimicking of Coronary Hemodynamics for Ex-Vivo Stimulation of Human Saphenous Veins. Ann Biomed Eng 2016; 45:884-897. [PMID: 27752921 DOI: 10.1007/s10439-016-1747-7] [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: 05/18/2016] [Accepted: 10/05/2016] [Indexed: 01/25/2023]
Abstract
After coronary artery bypass grafting, structural modifications of the saphenous vein wall lead to lumen narrowing in response to the altered hemodynamic conditions. Here we present the design of a novel ex vivo culture system conceived for mimicking central coronary artery hemodynamics, and we report the results of biomechanical stimulation experiments using human saphenous vein samples. The novel pulsatile system used an aortic-like pressure for forcing a time-dependent coronary-like resistance to obtain the corresponding coronary-like flow rate. The obtained pulsatile pressures and flow rates (diastolic/systolic: 80/120 mmHg and 200/100 mL/min, respectively) showed a reliable mimicking of the complex coronary hemodynamic environment. Saphenous vein segments from patients undergoing coronary artery bypass grafting (n = 12) were subjected to stimulation in our bioreactor with coronary pulsatile pressure/flow patterns or with venous-like perfusion. After 7-day stimulation, SVs were fixed and stained for morphometric evaluation and immunofluorescence. Results were compared with untreated segments of the same veins. Morphometric and immunofluorescence analysis revealed that 7 days of pulsatile stimulation: (i) did not affect integrity of the vessel wall and lumen perimeter, (ii) significantly decreased both intima and media thickness, (iii) led to partial endothelial denudation, and (iv) induced apoptosis in the vessel wall. These data are consistent with the early vessel remodeling events involved in venous bypass adaptation to arterial flow/pressure patterns. The pulsatile system proved to be a suitable device to identify ex vivo mechanical cues leading to graft adaptation.
Collapse
|
5
|
Herting S, DiBartolomeo A, Pipes T, Kunz S, Temnyk K, Truty J, Ur S, Cardinal KO. Human Umbilical Versus Coronary Cell Sources for Tissue-Engineered Blood Vessel Mimics. ACTA ACUST UNITED AC 2016. [DOI: 10.1089/aivt.2016.0012] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Scott Herting
- Department of Biomedical Engineering, Cal Poly, San Luis Obispo, San Luis Obispo, California
| | - Alex DiBartolomeo
- Department of Biomedical Engineering, Cal Poly, San Luis Obispo, San Luis Obispo, California
| | - Toni Pipes
- Department of Biomedical Engineering, Cal Poly, San Luis Obispo, San Luis Obispo, California
| | - Shelby Kunz
- Department of Biomedical Engineering, Cal Poly, San Luis Obispo, San Luis Obispo, California
| | - Kristen Temnyk
- Department of Biomedical Engineering, Cal Poly, San Luis Obispo, San Luis Obispo, California
| | - Jakub Truty
- Department of Biomedical Engineering, Cal Poly, San Luis Obispo, San Luis Obispo, California
| | - Sarah Ur
- Department of Biomedical Engineering, Cal Poly, San Luis Obispo, San Luis Obispo, California
| | | |
Collapse
|
6
|
Warren KM, Islam MM, LeDuc PR, Steward R. 2D and 3D Mechanobiology in Human and Nonhuman Systems. ACS APPLIED MATERIALS & INTERFACES 2016; 8:21869-21882. [PMID: 27214883 DOI: 10.1021/acsami.5b12064] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Mechanobiology involves the investigation of mechanical forces and their effect on the development, physiology, and pathology of biological systems. The human body has garnered much attention from many groups in the field, as mechanical forces have been shown to influence almost all aspects of human life ranging from breathing to cancer metastasis. Beyond being influential in human systems, mechanical forces have also been shown to impact nonhuman systems such as algae and zebrafish. Studies of nonhuman and human systems at the cellular level have primarily been done in two-dimensional (2D) environments, but most of these systems reside in three-dimensional (3D) environments. Furthermore, outcomes obtained from 3D studies are often quite different than those from 2D studies. We present here an overview of a select group of human and nonhuman systems in 2D and 3D environments. We also highlight mechanobiological approaches and their respective implications for human and nonhuman physiology.
Collapse
Affiliation(s)
- Kristin M Warren
- Departments of Mechanical Engineering, Biomedical Engineering, Computational Biology, and Biological Sciences, Carnegie Mellon University , Pittsburgh, Pennsylvania 15213, United States
| | - Md Mydul Islam
- Department of Mechanical and Aerospace Engineering and Burnett School of Biomedical Sciences, University of Central Florida , Orlando, Florida 32827, United States
| | - Philip R LeDuc
- Departments of Mechanical Engineering, Biomedical Engineering, Computational Biology, and Biological Sciences, Carnegie Mellon University , Pittsburgh, Pennsylvania 15213, United States
| | - Robert Steward
- Department of Mechanical and Aerospace Engineering and Burnett School of Biomedical Sciences, University of Central Florida , Orlando, Florida 32827, United States
| |
Collapse
|
7
|
Wiegmann B, von Seggern H, Höffler K, Korossis S, Dipresa D, Pflaum M, Schmeckebier S, Seume J, Haverich A. Developing a biohybrid lung – sufficient endothelialization of poly-4-methly-1-pentene gas exchange hollow-fiber membranes. J Mech Behav Biomed Mater 2016; 60:301-311. [DOI: 10.1016/j.jmbbm.2016.01.032] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2015] [Revised: 01/22/2016] [Accepted: 01/27/2016] [Indexed: 11/29/2022]
|
8
|
Novel Sensor-Enabled Ex Vivo Bioreactor: A New Approach towards Physiological Parameters and Porcine Artery Viability. BIOMED RESEARCH INTERNATIONAL 2015; 2015:958170. [PMID: 26609536 PMCID: PMC4644552 DOI: 10.1155/2015/958170] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/24/2014] [Revised: 03/12/2015] [Accepted: 03/18/2015] [Indexed: 11/18/2022]
Abstract
The aim of the present work is to design and construct an ex vivo bioreactor system to assess the real time viability of vascular tissue. Porcine carotid artery as a model tissue was used in the ex vivo bioreactor setup to monitor its viability under physiological conditions such as oxygen, pressure, temperature, and flow. The real time tissue viability was evaluated by monitoring tissue metabolism through a fluorescent indicator "resorufin." Our ex vivo bioreactor allows real time monitoring of tissue responses along with physiological conditions. These ex vivo parameters were vital in determining the tissue viability in sensor-enabled bioreactor and our initial investigations suggest that, porcine tissue viability is considerably affected by high shear forces and low oxygen levels. Histological evaluations with hematoxylin and eosin and Masson's trichrome staining show intact endothelium with fresh porcine tissue whereas tissues after incubation in ex vivo bioreactor studies indicate denuded endothelium supporting the viability results from real time measurements. Hence, this novel viability sensor-enabled ex vivo bioreactor acts as model to mimic in vivo system and record vascular responses to biopharmaceutical molecules and biomedical devices.
Collapse
|
9
|
Czapla Z, McPhail SM. Electrophoretic mobility of cell nuclei (EMN index) as a biomarker of the biological aging process: Considering the association between EMN index and age. HOMO-JOURNAL OF COMPARATIVE HUMAN BIOLOGY 2015; 66:549-60. [PMID: 26433343 DOI: 10.1016/j.jchb.2015.09.002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/09/2013] [Accepted: 03/16/2015] [Indexed: 10/23/2022]
Abstract
The present study examined whether a specific property of cell microstructures may be useful as a biomarker of aging. Specifically, the association between age and changes of cellular structures reflected in electrophoretic mobility of cell nuclei index (EMN index) values across the adult lifespan was examined. This report considers findings from cross sections of females (n=1273) aged 18-98 years, and males (n=506) aged 19-93 years. A Biotest apparatus was used to perform intracellular microelectrophoresis on buccal epithelial cells collected from each individual. EMN index was calculated on the basis of the number of epithelial cells with mobile nuclei in reference to the cells with immobile nuclei per 100cells. Regression analyses indicated a significant negative association between EMN index value and age for men (r=-0.71, p<0.001) and women (r=-0.60, p<0.001); demonstrating a key requirement that must be met by a biomarker of aging. The strength of association observed between EMN index and age for both men and women was encouraging and supports the potential use of EMN index for determining a biological age of an individual (or a group). In this study, a new attempt of complex explanation of cellular mechanisms contributing to age related changes of the EMN index was made. In this study, a new attempt of complex explanation of cellular mechanisms contributing to age related changes of the EMN index was made. EMN index has demonstrated potential to meet criteria proposed for biomarkers of aging and further investigations are necessary.
Collapse
Affiliation(s)
- Z Czapla
- Department of Human Developmental Biology, Institute of Anthropology, Faculty of Biology, Adam Mickiewicz University, Poznań 61-614, Poland.
| | - S M McPhail
- Institute of Health and Biomedical Innovation and School of Public Health & Social Work, Queensland University of Technology, Victoria Park Road, Kelvin Grove, Brisbane, Queensland 4059, Australia; Centre for Functioning and Health Research, Metro South Health, Cnr of Ipswich Road and Cornwall Street, Buranda, Brisbane, Queensland 4102, Australia
| |
Collapse
|
10
|
El-Kurdi MS, Soletti L, Nieponice A, Abuin G, Gross C, Rousselle S, Greisler H, McGrath J. Ovine femoral artery bypass grafting using saphenous vein: a new model. J Surg Res 2014; 193:458-69. [PMID: 25151470 DOI: 10.1016/j.jss.2014.07.048] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2014] [Revised: 06/27/2014] [Accepted: 07/18/2014] [Indexed: 11/17/2022]
Abstract
BACKGROUND Saphenous vein grafts (SVGs) are frequently used for multi-vessel coronary artery bypass grafting and peripheral arterial bypasses; however, the estimated 40% failure rate within the first 5 y due to intimal hyperplasia (IH) and the subsequent failure rate of 2%-4% per year pose a significant clinical problem. Here, we report a surgical model in sheep intended to study IH development in SVGs, which can also be used for the evaluation of potential alternative treatments. MATERIALS AND METHODS Autologous bilateral SVGs were implanted as femoral artery interposition grafts using end-to-side anastomoses in adult sheep (n = 23), which were survived for 30 (n = 6), 90 (n = 7), 180 (n = 7), or 365 (n = 3) days. Post-implant, mid-term, and pretermination angiograms were quantified, and harvested SVGs were evaluated using quantitative histomorphometry. RESULTS We describe a peripheral arterial surgical technique that models the progression of SVG pathology. Angiographic analysis showed a progressive dilation of SVGs leading to worsening diametrical matching to the target artery and reduced blood flow; and histomorphometry data showed an increase in IH over time. Multivariable regression analysis suggested that statistically significant (P < 0.05) time-dependent relationships exist between SVG dilation and both reduction in blood flow and IH development. CONCLUSIONS Bilateral SVGs implanted onto the femoral arteries of sheep produced, controlled and consistent angiographic and histomorphometric results for which direct correlations could be made. This preclinical investigation model can be used as a robust tool to evaluate therapies intended for cardiovascular pathologies such as occlusive IH in SVGs.
Collapse
Affiliation(s)
| | | | | | | | | | | | - Howard Greisler
- Department of Surgery, Loyola University, Maywood, Illinois; Research Services, Hines VA Hospital, Hines, Illinois
| | | |
Collapse
|
11
|
Chlupac J, Filova E, Havlikova J, Matejka R, Riedel T, Houska M, Brynda E, Pamula E, Rémy M, Bareille R, Fernandez P, Daculsi R, Bourget C, Bacakova L, Bordenave L. The gene expression of human endothelial cells is modulated by subendothelial extracellular matrix proteins: short-term response to laminar shear stress. Tissue Eng Part A 2014; 20:2253-64. [PMID: 24606163 DOI: 10.1089/ten.tea.2013.0153] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
Vascular surgery for atherosclerosis is confronted by the lack of a suitable bypass material. Tissue engineering strives to produce bio-artificial conduits to provide resistance to thrombosis. The objectives of our study were to culture endothelial cells (EC) on composite assemblies of extracellular matrix proteins, and to evaluate the cellular phenotype under flow. Cell-adhesive assemblies were fabricated on glass slides as combinations of collagen (Co), laminin (LM), and fibronectin (FN), resulting in three samples: Co, Co/LM, and Co/FN. Surface topography, roughness, and wettability were determined. Human saphenous vein EC were harvested from cardiac patients, cultured on the assemblies and submitted to laminar shear stress (SS) of 12 dyn/cm(2) for 40, 80, and 120 min. Cell retention was assessed and qRT-PCR of adhesion genes (VE-cadherin, vinculin, KDR, CD-31 or PECAM-1, β1-integrins) and metabolic genes (t-PA, NF-κB, eNOS and MMP-1) was performed. Quantitative immunofluorescence of VE cadherin, vinculin, KDR, and vonWillebrand factor was performed after 2 and 6 h of flow. Static samples were excluded from shearing. The cells reached confluence with similar growth curves. The cells on Co/LM and Co/FN were resistant to flow up to 120 min but minor desquamation occurred on Co corresponding with temporary downregulation of VE cadherin and vinculin-mRNA and decreased fluorescence of vinculin. The cells seeded on Co/LM initially more upregulated vinculin-mRNA and also the inflammatory factor NF-κB, and the cells plated on Co/FN changed the expression profile minimally in comparison with the static control. Fluorescence of VE cadherin and vonWillebrand factor was enhanced on Co/FN. The cells cultured on Co/LM and Co/FN increased the vinculin fluorescence and expressed more VE cadherin and KDR-mRNA than the cells on Co. The cells plated on Co/FN upregulated the mRNA of VE cadherin, CD-31, and MMP 1 to a greater extent than the cells on Co/LM and they enhanced the fluorescence of VE cadherin, KDR, and vonWillebrand factor. Some of these changes sustained up to 6 h of flow, as confirmed by immunofluorescence. Combined matrices Co/LM and Co/FN seem to be more suitable for EC seeding and retention under flow. Moreover, Co/FN matrix promoted slightly more favorable cellular phenotype than Co/LM under SS of 2-6 h.
Collapse
Affiliation(s)
- Jaroslav Chlupac
- 1 Department of Biomaterials and Tissue Engineering, Institute of Physiology, Academy of Sciences of the Czech Republic , Prague, Czech Republic
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
12
|
Chlupáč J, Filová E, Riedel T, Houska M, Brynda E, Remy-Zolghadri M, Bareille R, Fernandez P, Daculsi R, Bourget C, Bordenave L, Bačáková L. Attachment of human endothelial cells to polyester vascular grafts: pre-coating with adhesive protein assemblies and resistance to short-term shear stress. Physiol Res 2014; 63:167-77. [PMID: 24397801 DOI: 10.33549/physiolres.932577] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
Cardiovascular prosthetic bypass grafts do not endothelialize spontaneously in humans, and so they pose a thrombotic risk. Seeding with cells improves their performance, particularly in small-caliber applications. Knitted tubular polyethylene-terephthalate (PET) vascular prostheses (6 mm) with commercial type I collagen (PET/Co) were modified in the lumen by the adsorption of laminin (LM), by coating with a fibrin network (Fb) or a combination of Fb and fibronectin (Fb/FN). Primary human saphenous vein endothelial cells were seeded (1.50 × 10(5)/cm2), cultured for 72 h and exposed to laminar shear stress 15 dyn/cm(2) for 40 and 120 min. The control static grafts were excluded from shearing. The cell adherence after 4 h on PET/Co, PET/Co +LM, PET/Co +Fb and PET/Co +Fb/FN was 22%, 30%, 19% and 27% of seeding, respectively. Compared to the static grafts, the cell density on PET/Co and PET/Co +LM dropped to 61% and 50%, respectively, after 120 min of flow. The cells on PET/Co +Fb and PET/Co +Fb/FN did not show any detachment during 2 h of shear stress. Pre-coating the clinically-used PET/Co vascular prosthesis with LM or Fb/FN adhesive protein assemblies promotes the adherence of endothelium. Cell retention under flow is improved particularly on fibrin-containing (Fb and Fb/FN) surfaces.
Collapse
Affiliation(s)
- J Chlupáč
- Department of Biomaterials and Tissue Engineering, Institute of Physiology Academy of Sciences of the Czech Republic, Prague, Czech Republic.
| | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
13
|
Massai D, Cerino G, Gallo D, Pennella F, Deriu M, Rodriguez A, Montevecchi F, Bignardi C, Audenino A, Morbiducci U. Bioreactors as Engineering Support to Treat Cardiac Muscle and Vascular Disease. JOURNAL OF HEALTHCARE ENGINEERING 2013; 4:329-70. [DOI: 10.1260/2040-2295.4.3.329] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
|
14
|
Ghriallais RN, McNamara L, Bruzzi M. Comparison of in vitro human endothelial cell response to self-expanding stent deployment in a straight and curved peripheral artery simulator. J R Soc Interface 2013; 10:20120965. [PMID: 23365191 DOI: 10.1098/rsif.2012.0965] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
Haemodynamic forces have a synergistic effect on endothelial cell (EC) morphology, proliferation, differentiation and biochemical expression profiles. Alterations to haemodynamic force levels have been observed at curved regions and bifurcations of arteries but also around struts of stented arteries, and are also known to be associated with various vascular pathologies. Therefore, curvature in combination with stenting might create a pro-atherosclerotic environment compared with stenting in a straight vessel, but this has never been investigated. The goal of this study was to compare EC morphology, proliferation and differentiation within in vitro models of curved stented peripheral vessel models with those of straight and unstented vessels. These models were generated using both static conditions and also subjected to 24 h of stimulation in a peripheral artery bioreactor. Medical-grade silicone tubes were seeded with human umbilical vein endothelial cells to produce pseudovessels that were then stented and subjected to 24 h of physiological levels of pulsatile pressure, radial distention and shear stress. Changes in cell number, orientation and nitric oxide (NO) production were assessed in straight, curved, non-stented and stented pseudovessels. We report that curved pseudovessels lead to higher EC numbers with random orientation and lower NO production per cell compared with straight pseudovessels after 24 h of biomechanical stimulation. Both stented curved and stented straight pseudovessels had lower NO production per cell than corresponding unstented pseudovessels. However, in contrast to straight stented pseudovessels, curved stented pseudovessels had fewer viable cells. The results of this study show, for the first time, that the response of the vascular endothelium is dependent on both curvature and stenting combined, and highlight the necessity for future investigations of the effects of curvature in combination with stenting to fully understand effects on the endothelial layer.
Collapse
Affiliation(s)
- Ríona Ní Ghriallais
- Department of Mechanical and Biomedical Engineering, National University of Ireland, Galway, Ireland.
| | | | | |
Collapse
|
15
|
Rennier K, Ji JY. Effect of shear stress and substrate on endothelial DAPK expression, caspase activity, and apoptosis. BMC Res Notes 2013; 6:10. [PMID: 23305096 PMCID: PMC3599066 DOI: 10.1186/1756-0500-6-10] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2012] [Accepted: 01/08/2013] [Indexed: 01/23/2023] Open
Abstract
Background In the vasculature, misdirected apoptosis in endothelial cells leads to pathological conditions such as inflammation. Along with biochemical and molecular signals, the hemodynamic forces that the cells experience are also important regulators of endothelial functions such as proliferation and apoptosis. Laminar shear stress inhibits apoptosis induced by serum depletion, oxidative stress, and tumor necrosis factor α (TNFα). Death associated protein kinase (DAPK) is a positive regulator of TNFα induced apoptotic pathway. Here we investigate the effect of shear stress on DAPK in endothelial cells on glass or silicone membrane substrate. We have already shown a link between shear stress and DAPK expression and apoptosis in cells on glass. Here we transition our study to endothelial cells on non-glass substrates, such as flexible silicone membrane used for cyclic strain studies. Results We modified the classic parallel plate flow chamber to accommodate silicone membrane as substrate for cells, and validated the chamber for cell viability in shear stress experiments. We found that adding shear stress significantly suppressed TNFα induced apoptosis in cells; while shearing cells alone also increased apoptosis on either substrate. We also found that shearing cells at 12 dynes/cm2 for 6 hours resulted in increased apoptosis on both substrates. This shear-induced apoptosis correlated with increased caspase 3/7 activities and DAPK expression and activation via dephosphorylation of serine 308. Conclusion These data suggest that shear stress induced apoptosis in endothelial cells via increased DAPK expression and activation as well as caspase-3/7 activity. Most in vitro shear stress studies utilize the conventional parallel plate flow chamber where cells are cultured on glass, which is much stiffer than what cells encounter in vivo. Other mechanotransduction studies have utilized the flexible silicone membrane as substrate, for example, in cyclic stretch studies. Thus, this study bridges the gap between shear stress studies on cells plated on glass to studies on different stiffness of substrates or mechanical stimulation such as cyclic strain. We continue to explore the mechanotransduction role of DAPK in endothelial apoptosis, by using substrates of physiological stiffness for shear stress studies, and by using silicone substrate in cyclic stretch devices.
Collapse
Affiliation(s)
- Keith Rennier
- Department of Biomedical Engineering, Indiana University Purdue University Indianapolis, 723 West Michigan Street, SL-220J, Indianapolis, IN 46202, USA
| | | |
Collapse
|
16
|
Tillman BW, Yazdani SK, Neff LP, Corriere MA, Christ GJ, Soker S, Atala A, Geary RL, Yoo JJ. Bioengineered vascular access maintains structural integrity in response to arteriovenous flow and repeated needle puncture. J Vasc Surg 2012; 56:783-93. [PMID: 22917043 DOI: 10.1016/j.jvs.2012.02.030] [Citation(s) in RCA: 65] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2011] [Revised: 02/07/2012] [Accepted: 02/15/2012] [Indexed: 11/19/2022]
Abstract
OBJECTIVE Tissue-engineered blood vessels (TEBV) have been proposed as an alternative to prosthetic grafts for dialysis access. However, arteriovenous (AV) grafts must withstand extreme flow rates and frequent needle trauma. In a proof-of-concept study, we sought to determine whether scaffold-based TEBV could withstand the hemodynamic and mechanical challenges of chronic dialysis access. METHODS TEBV were constructed using decellularized arterial scaffolds seeded with autologous ovine endothelial cells (EC) derived from circulating endothelial progenitor cells (EPC) using a novel high-affinity capture approach. Seeded scaffolds were preconditioned to arterial pressure and flow in a bioreactor for 2 weeks prior to implantation to create carotid artery to jugular vein AV grafts in each animal. TEBV were healed for 1 month before initiating percutaneous needle puncture 3 days/week. TEBV wall geometry and patency were monitored using duplex imaging and were either explanted for histologic analysis at 2 months (n = 5) or followed for up to 6 months until venous outflow stenosis threatened AV graft patency (n = 6). RESULTS Despite high flow, TEBV maintained stable geometry with only modest wall dilation (under 6%) by 4 months after implantation. Needle access was well tolerated with a single puncture site complication, a small pseudoaneurysm, occurring in the late group. Time-to-hemostasis at puncture sites averaged 4 ± 2 minutes. Histologic analysis at 2 months demonstrated repopulation of the outer TEBV wall by host cells and healing of needle punctures by cellular ingrowth and new matrix deposition along the tract. TEBV followed beyond 2 months showed stable wall geometry but, consistent with the primary mode of clinical AV graft failure, all TEBV eventually developed venous anastomotic stenosis (mean, 4.4 ± 0.9 months; range, 3.3-5.6 months postimplantation; n = 6). CONCLUSIONS This pilot study supports the concept of creating dialysis access from scaffold-based autologous TEBV. Engineered AV grafts were created within a clinically relevant time frame and demonstrated stable wall geometry despite high flow and repeated puncture. Cellular ingrowth and puncture site healing may improve wall durability, but venous outflow stenosis remains the primary mode of TEBV graft failure in the ovine model.
Collapse
MESH Headings
- Angiography, Digital Subtraction
- Animals
- Arteriovenous Shunt, Surgical/adverse effects
- Arteriovenous Shunt, Surgical/instrumentation
- Bioreactors
- Blood Pressure
- Blood Vessel Prosthesis
- Blood Vessel Prosthesis Implantation/adverse effects
- Blood Vessel Prosthesis Implantation/instrumentation
- Carotid Arteries/diagnostic imaging
- Carotid Arteries/pathology
- Carotid Arteries/physiopathology
- Carotid Arteries/surgery
- Cell Culture Techniques
- Cells, Cultured
- Constriction, Pathologic
- Endothelial Cells/transplantation
- Equipment Failure Analysis
- Feasibility Studies
- Graft Occlusion, Vascular/diagnosis
- Graft Occlusion, Vascular/etiology
- Graft Occlusion, Vascular/physiopathology
- Hemodynamics
- Jugular Veins/diagnostic imaging
- Jugular Veins/pathology
- Jugular Veins/physiopathology
- Jugular Veins/surgery
- Materials Testing
- Models, Animal
- Needles
- Pilot Projects
- Prosthesis Design
- Prosthesis Failure
- Pulsatile Flow
- Punctures
- Regional Blood Flow
- Renal Dialysis
- Sheep
- Stem Cell Transplantation
- Stress, Mechanical
- Time Factors
- Tissue Engineering/methods
- Tissue Scaffolds
- Tomography, X-Ray Computed
- Ultrasonography, Doppler, Color
- Ultrasonography, Doppler, Pulsed
- Vascular Patency
Collapse
Affiliation(s)
- Bryan W Tillman
- Wake Forest Institute for Regenerative Medicine, Wake Forest University School of Medicine, Winston-Salem, NC 27157, USA
| | | | | | | | | | | | | | | | | |
Collapse
|
17
|
Zheng W, Jiang B, Wang D, Zhang W, Wang Z, Jiang X. A microfluidic flow-stretch chip for investigating blood vessel biomechanics. LAB ON A CHIP 2012; 12:3441-3450. [PMID: 22820518 DOI: 10.1039/c2lc40173h] [Citation(s) in RCA: 98] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
This microfluidic flow-stretch chip integrates fluid shear stress (FSS) and cyclic stretch (CS), two major mechanical stimulations in cardiovascular systems, for cultured cells. The model chip can deliver FSS and CS simultaneously or independently to vascular cells to mimic the haemodynamic microenvironment of blood vessels in vivo. By imposing FSS-only, CS-only, and FSS+CS stimulation on rat mesenchymal stem cells and human umbilical vein endothelial cells, we found the alignment of the cellular stress fibers varied with cell type and the type of stimulation. The flow-stretch chip is a reliable tool for simulating the haemodynamic microenvironment.
Collapse
Affiliation(s)
- Wenfu Zheng
- CAS Key Lab for Biological Effects of Nanomaterials and Nanosafety, National Center for NanoScience & Technology, 11 ZhongGuanCun BeiYiTiao, Beijing, 100190, China
| | | | | | | | | | | |
Collapse
|
18
|
HE JIANKANG, LI DICHEN, LIU YAXIONG, LI XIAO, XU SHANGLONG, LU BINGHENG. COMPUTATIONAL FLUID DYNAMICS FOR TISSUE ENGINEERING APPLICATIONS. J MECH MED BIOL 2011. [DOI: 10.1142/s0219519411004046] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Hydrodynamic cellular environment plays an important role in translating engineered tissue constructs into clinically useful grafts. However, the cellular fluid dynamic environment inside bioreactor systems is highly complex and it is normally impractical to experimentally characterize the local flow patterns at the cellular scale. Computational fluid dynamics (CFD) has been recognized as an invaluable and reliable alternative to investigate the complex relationship between hydrodynamic environments and the regeneration of engineered tissues at both the macroscopic and microscopic scales. This review describes the applications of CFD simulations to probe the hydrodynamic environment parameters (e.g., flow rate, shear stress, etc.) and the corresponding experimental validations. We highlight the use of CFD to optimize bioreactor design and scaffold architectures for improved ex-vivo hydrodynamic environments. It is envisioned that CFD could be used to customize specific hydrodynamic cellular environments to meet the unique requirements of different cell types in combination with advanced manufacturing techniques and finally facilitate the maturation of tissue-engineered constructs.
Collapse
Affiliation(s)
- JIANKANG HE
- State Key Laboratory for Manufacturing Systems Engineering, Xi'an Jiaotong University, Xi'an 710049, China
| | - DICHEN LI
- State Key Laboratory for Manufacturing Systems Engineering, Xi'an Jiaotong University, Xi'an 710049, China
| | - YAXIONG LIU
- State Key Laboratory for Manufacturing Systems Engineering, Xi'an Jiaotong University, Xi'an 710049, China
| | - XIAO LI
- State Key Laboratory for Manufacturing Systems Engineering, Xi'an Jiaotong University, Xi'an 710049, China
| | - SHANGLONG XU
- Department of Mechatronics Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China
| | - BINGHENG LU
- State Key Laboratory for Manufacturing Systems Engineering, Xi'an Jiaotong University, Xi'an 710049, China
| |
Collapse
|
19
|
Cavazzuti M, Atherton MA, Collins MW, Barozzi GS. Non-newtonian and flow pulsatility effects in simulation models of a stented intracranial aneurysm. Proc Inst Mech Eng H 2011; 225:597-609. [PMID: 22034743 DOI: 10.1177/09544119jeim894] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Three models of different stent designs implanted in a cerebral aneurysm, originating from the Virtual Intracranial Stenting Challenge '07, are meshed and the flow characteristics simulated using commercial computational fluid dynamics (CFD) software in order to investigate the effects of non-Newtonian viscosity and pulsatile flow. Conventional mass inflow and wall shear stress (WSS) output are used as a means of comparing the CFD simulations. In addition, a WSS distribution is presented, which clearly discriminates in favour of the stent design identified by other groups. It is concluded that non-Newtonian and pulsatile effects are important to include in order to avoid underestimating wss, to understand dynamic flow effects, and to discriminate more effectively between stent designs.
Collapse
Affiliation(s)
- M Cavazzuti
- Dipartimento di Ingegneria Meccanica e Civile, Università degli Studi di Modena e Reggio Emilia, Modena, Italy
| | | | | | | |
Collapse
|
20
|
Modelling wall shear stress in small arteries using the Lattice Boltzmann method: influence of the endothelial wall profile. Med Eng Phys 2011; 33:832-9. [DOI: 10.1016/j.medengphy.2011.03.009] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2010] [Revised: 03/21/2011] [Accepted: 03/23/2011] [Indexed: 11/22/2022]
|
21
|
Kim DH, Heo SJ, Kim SH, Shin JW, Park SH, Shin JW. Shear stress magnitude is critical in regulating the differentiation of mesenchymal stem cells even with endothelial growth medium. Biotechnol Lett 2011; 33:2351-9. [DOI: 10.1007/s10529-011-0706-5] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2011] [Accepted: 07/12/2011] [Indexed: 01/10/2023]
|
22
|
Mackle JN, Blond DJP, Mooney E, McDonnell C, Blau WJ, Shaw G, Barry FP, Murphy JM, Barron V. In vitro Characterization of an Electroactive Carbon-Nanotube-Based Nanofiber Scaffold for Tissue Engineering. Macromol Biosci 2011; 11:1272-82. [DOI: 10.1002/mabi.201100029] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2011] [Revised: 05/10/2011] [Indexed: 11/08/2022]
|
23
|
Dermenoudis S, Missirlis Y. Design of a novel rotating wall bioreactor for the in vitro simulation of the mechanical environment of the endothelial function. J Biomech 2010; 43:1426-31. [DOI: 10.1016/j.jbiomech.2010.01.012] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2009] [Revised: 01/11/2010] [Accepted: 01/31/2010] [Indexed: 10/19/2022]
|
24
|
Behavior of Human Mesenchymal Stem Cells in Fibrin-Based Vascular Tissue Engineering Constructs. Ann Biomed Eng 2010; 38:649-57. [DOI: 10.1007/s10439-010-9912-x] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2008] [Accepted: 01/05/2010] [Indexed: 10/20/2022]
|
25
|
Ishikawa K, Thibeault S. Voice rest versus exercise: a review of the literature. J Voice 2009; 24:379-87. [PMID: 19660903 DOI: 10.1016/j.jvoice.2008.10.011] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2008] [Accepted: 10/22/2008] [Indexed: 12/12/2022]
Abstract
Voice rest is commonly prescribed after vocal fold surgery to promote wound healing of the vocal fold. Currently, there is no standard protocol that is established based on biological evidence. In orthopedic rehabilitation, long-term rest is found to be less effective for connective tissue healing than exercise. Connective tissue healing is also an important factor for successful voice rehabilitation; however, whether this concept can be extrapolated to voice rehabilitation is unknown. The purpose of this article is to review current clinical and basic science literature to examine the effect of voice rest in postsurgical rehabilitation. First, we present a summary of clinical literature that pertains to voice rest. Second, we present description of connective tissues that are involved in orthopedic and voice rehabilitation, specifically, ligament and lamina propria, respectively, and their wound healing process. Third, a summary of the literature from orthopedic research on the effect of rest versus exercise is presented. Lastly, it summarizes in vitro and in vivo studies that examined the effect of mechanical stress on vocal fold tissue. Current literature suggests that there is a lack of clinical evidence that supports a specific type and duration of voice rest, and extrapolation of the findings from orthopedic research may be unreasonable due to the morphological and biochemical difference between the tissues. To determine the effect of voice rest, further elucidation of vocal fold wound healing process and the effect of mechanical stress on vocal fold tissue remodeling are needed.
Collapse
Affiliation(s)
- Keiko Ishikawa
- Division of Otolaryngology, Head and Neck Surgery, University of Wisconsin-Madison, Wisconsin Institute of Medical Research, Madison, Wisconsin 53705-2275, USA
| | | |
Collapse
|
26
|
Punchard MA, O'Cearbhaill ED, Mackle JN, McHugh PE, Smith TJ, Stenson-Cox C, Barron V. Evaluation of Human Endothelial Cells Post Stent Deployment in a Cardiovascular Simulator In Vitro. Ann Biomed Eng 2009; 37:1322-30. [PMID: 19408120 DOI: 10.1007/s10439-009-9701-6] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2008] [Accepted: 04/10/2009] [Indexed: 12/28/2022]
Affiliation(s)
- Marie A Punchard
- National Centre for Biomedical Engineering, Orbsen Building, National University of Ireland, Galway, University Road, Galway, Ireland
| | | | | | | | | | | | | |
Collapse
|
27
|
O'Cearbhaill ED, Punchard MA, Murphy M, Barry FP, McHugh PE, Barron V. Response of mesenchymal stem cells to the biomechanical environment of the endothelium on a flexible tubular silicone substrate. Biomaterials 2008; 29:1610-9. [PMID: 18194813 DOI: 10.1016/j.biomaterials.2007.11.042] [Citation(s) in RCA: 65] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2007] [Accepted: 11/28/2007] [Indexed: 12/21/2022]
Abstract
Understanding the response of mesenchymal stem cells (MSCs) to forces in the vasculature is very important in the field of cardiovascular intervention for a number of reasons. These include the development of MSC seeded tissue engineered vascular grafts, targeted or systemic delivery of MSCs in the dynamic environment of the coronary artery and understanding the potential pathological calcifying role of mechanically conditioned multipotent cells already present in the vessel wall. In vivo, cells present in the coronary artery are exposed to the primary biomechanical forces of shear stress, radial stress and hoop stress. To date, many studies have examined the effect of these stresses in isolation, thereby not presenting the complete picture. Therefore, the main aim of this study is to examine the combined role of these stresses on MSC behaviour. To this end, a bioreactor was configured to expose MSCs seeded on flexible silicone substrates to physiological forces - namely, a pulsatile pressure between 40 and 120mmHg (5.33-1.6x10(4)Pa), radial distention of 5% and a shear stress of 10dyn/cm(2) (1Pa) at frequency of 1Hz for up to 24h. Thereafter, the 'pseudovessel' was assessed for changes in morphology, orientation and expression of endothelial and smooth muscle cell (SMC) specific markers. Hematoxylin and eosin (H&E) staining revealed that MSCs exhibit a similar mechanosensitive response to that of endothelial cells (ECs); they reorientate parallel with direction of flow and have adapted their morphology to be similar to that of ECs. However, gene expression results show the cells exhibit greater levels of SMC-associated markers alpha-smooth muscle actin and calponin (p<0.05).
Collapse
Affiliation(s)
- Eoin D O'Cearbhaill
- National Centre for Biomedical Engineering Science, National University of Ireland, Galway, Galway, Ireland
| | | | | | | | | | | |
Collapse
|