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Yacoub MH, Tseng YT, Kluin J, Vis A, Stock U, Smail H, Sarathchandra P, Aikawa E, El-Nashar H, Chester AH, Shehata N, Nagy M, El-Sawy A, Li W, Burriesci G, Salmonsmith J, Romeih S, Latif N. Valvulogenesis of a living, innervated pulmonary root induced by an acellular scaffold. Commun Biol 2023; 6:1017. [PMID: 37805576 PMCID: PMC10560219 DOI: 10.1038/s42003-023-05383-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2022] [Accepted: 09/21/2023] [Indexed: 10/09/2023] Open
Abstract
Heart valve disease is a major cause of mortality and morbidity worldwide with no effective medical therapy and no ideal valve substitute emulating the extremely sophisticated functions of a living heart valve. These functions influence survival and quality of life. This has stimulated extensive attempts at tissue engineering "living" heart valves. These attempts utilised combinations of allogeneic/ autologous cells and biological scaffolds with practical, regulatory, and ethical issues. In situ regeneration depends on scaffolds that attract, house and instruct cells and promote connective tissue formation. We describe a surgical, tissue-engineered, anatomically precise, novel off-the-shelf, acellular, synthetic scaffold inducing a rapid process of morphogenesis involving relevant cell types, extracellular matrix, regulatory elements including nerves and humoral components. This process relies on specific material characteristics, design and "morphodynamism".
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Affiliation(s)
- Magdi H Yacoub
- Magdi Yacoub Institute, Harefield, UK.
- National Heart and Lung Institute, Imperial College London, London, UK.
- Aswan Heart Science Center, Magdi Yacoub Foundation, Aswan, Egypt.
| | - Yuan-Tsan Tseng
- Magdi Yacoub Institute, Harefield, UK
- National Heart and Lung Institute, Imperial College London, London, UK
| | - Jolanda Kluin
- Department of Cardiothoracic Surgery, Erasmus MC, Rotterdam, The Netherlands
| | - Annemijn Vis
- Amsterdam UMC, University of Amsterdam, Department of Cardiothoracic Surgery, Amsterdam, The Netherlands
| | - Ulrich Stock
- National Heart and Lung Institute, Imperial College London, London, UK
- Royal Brompton and Harefield Hospital, London, UK
| | | | - Padmini Sarathchandra
- Magdi Yacoub Institute, Harefield, UK
- National Heart and Lung Institute, Imperial College London, London, UK
| | - Elena Aikawa
- Cardiovascular Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, USA
| | - Hussam El-Nashar
- Aswan Heart Science Center, Magdi Yacoub Foundation, Aswan, Egypt
- Department of Bioengineering, Imperial College London, London, UK
| | - Adrian H Chester
- Magdi Yacoub Institute, Harefield, UK
- National Heart and Lung Institute, Imperial College London, London, UK
| | - Nairouz Shehata
- Aswan Heart Science Center, Magdi Yacoub Foundation, Aswan, Egypt
- Department of Computing, Imperial College London, London, UK
| | - Mohamed Nagy
- Aswan Heart Science Center, Magdi Yacoub Foundation, Aswan, Egypt
| | - Amr El-Sawy
- Aswan Heart Science Center, Magdi Yacoub Foundation, Aswan, Egypt
| | - Wei Li
- Royal Brompton and Harefield Hospital, London, UK
| | - Gaetano Burriesci
- Cardiovascular Engineering Laboratory, UCL Mechanical Engineering, University College London, London, UK
- Bioengineering Unit, Ri.MED Foundation, Palermo, Italy
| | - Jacob Salmonsmith
- Cardiovascular Engineering Laboratory, UCL Mechanical Engineering, University College London, London, UK
| | - Soha Romeih
- Aswan Heart Science Center, Magdi Yacoub Foundation, Aswan, Egypt
| | - Najma Latif
- Magdi Yacoub Institute, Harefield, UK
- National Heart and Lung Institute, Imperial College London, London, UK
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Wongkhieo S, Tangmesupphaisan W, Siriwaseree J, Aramsirirujiwet Y, Wiriyajitsomboon P, Kaewgrajang T, Pumloifa S, Paemanee A, Kuaprasert B, Choowongkomon K, Chester AH, Swainson NM. In vitro cholesterol lowering activity of Ganoderma australe mycelia based on mass spectrometry, synchrotron Fourier-transform infrared analysis and liver-spheroid bioactivity. Sci Rep 2023; 13:13619. [PMID: 37604902 PMCID: PMC10442327 DOI: 10.1038/s41598-023-40861-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2023] [Accepted: 08/17/2023] [Indexed: 08/23/2023] Open
Abstract
Mycelia were cultivated from a Thai wild mushroom identified as Ganoderma australe based on polymerase chain reaction (PCR) and morphological analyses. The mycelial extracts were examined for their active ingredients using a liquid chromatography-tandem mass spectrometry (LC‒MS/MS) method. This revealed the presence of lovastatin and tentative compounds including p-coumaric, nicotinamide, gamma-aminobutyric acid, choline, nucleosides, amino acids, and saccharides. The extracts had an inhibitory effect on the activity of HMG-CoA reductase in a concentration-dependent manner. At 2.5 mg/mL, the G. australe extracts did not interfere with the viability of HepG2 spheroids, but their biochemical composition was altered as determined by Fourier-transform infrared (FTIR) spectroscopy. The lipid profile of the spheroids treated with the mycelial extract was distinct from that of the control and the 5 µM lovastatin treatment, corresponding with the production of cholesterol by the spheroids. The mycelia of G. australe increased the percentage of high-density lipoprotein (HDL) production to 71.35 ± 2.74%, compared to the control and lovastatin-treated spheroids (33.26 ± 3.15% and 32.13 ± 3.24%, respectively). This study revealed the superior effect of natural compound mixtures to pure lovastatin, and the potential use of Thailand's wild G. australe as a functional food to prevent or alleviate hypercholesterolemia.
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Affiliation(s)
- Sudthirak Wongkhieo
- Department of Biochemistry, Faculty of Science, Kasetsart University, Bangkok, 10900, Thailand
| | | | - Jeeraprapa Siriwaseree
- Department of Biochemistry, Faculty of Science, Kasetsart University, Bangkok, 10900, Thailand
| | - Yaovapa Aramsirirujiwet
- Department of Microbiology, Faculty of Science, Kasetsart University, Bangkok, 10900, Thailand
| | | | - Tharnrat Kaewgrajang
- Department of Forest Biology, Faculty of Forestry, Kasetsart University, 50 Ngamwongwan Rd, Lat Yao, Chatuchak, Bangkok, 10900, Thailand
| | - Saifa Pumloifa
- National Center for Genetic Engineering and Biotechnology (BIOTEC), National Science and Technology Development Agency (NSTDA), Pathum Thani, 12120, Thailand
| | - Atchara Paemanee
- National Center for Genetic Engineering and Biotechnology (BIOTEC), National Science and Technology Development Agency (NSTDA), Pathum Thani, 12120, Thailand
| | - Buabarn Kuaprasert
- Research Facility Department, Synchrotron Light Research Institute (Public Organization), 111 University Avenue, Muang District, Nakhon Ratchasima, 30000, Thailand
| | - Kiattawee Choowongkomon
- Department of Biochemistry, Faculty of Science, Kasetsart University, Bangkok, 10900, Thailand
| | - Adrian H Chester
- Heart Science Centre, Magdi Yacoub Institute, Harefield, UK
- National Heart and Lung Institute (NHLI), Imperial College London, London, UK
| | - Napachanok M Swainson
- Department of Biochemistry, Faculty of Science, Kasetsart University, Bangkok, 10900, Thailand.
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Georgy M, Salhiyyah K, Yacoub MH, Chester AH. Role of hypoxia inducible factor HIF-1 α in heart valves. Glob Cardiol Sci Pract 2023; 2023:e202309. [PMID: 37351095 PMCID: PMC10282783 DOI: 10.21542/gcsp.2023.9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2023] [Accepted: 04/10/2023] [Indexed: 06/24/2023] Open
Abstract
The 2016 Albert Lasker Basic Medical Research Award and subsequently the 2019 Nobel Prize in Physiology or Medicine were awarded to William Kaelin, Jr., Sir Peter Ratcliffe, and Gregg Semenza for their work on how cells sense and adapt to hypoxic conditions. Their work showed that the changes in gene expression, cell metabolism, and tissue remodelling that occur in response to low oxygen concentrations are orchestrated by the transcription factor, hypoxia inducible factor-1α (HIF-1α). While the effects mediated by HIF-1α have been widely studied, its role in heart valves has only recently been investigated. These studies have shown that HIF-1α expression is evident in mechanisms that regulate the structure and function of heart valves. These include embryonic development, the regulation of the extracellular matrix, angiogenesis and the initiation of the calcification process. This review provides a background on the role and function of HIF-1α in response to hypoxia and a discussion of the available evidence of its involvement in the regulation of heart valves in health and disease.
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Affiliation(s)
- Mark Georgy
- Magdi Yacoub Institute, Heart Science Centre, Harefield, Middlesex, U.K.
| | - Kareem Salhiyyah
- Magdi Yacoub Institute, Heart Science Centre, Harefield, Middlesex, U.K.
- Farah General Hospital, Farah Medical Campus, Mai Ziyadeh Street, Amman, Jordan
| | - Magdi H. Yacoub
- Magdi Yacoub Institute, Heart Science Centre, Harefield, Middlesex, U.K.
| | - Adrian H. Chester
- Magdi Yacoub Institute, Heart Science Centre, Harefield, Middlesex, U.K.
- National Heart & Lung Institute, Imperial College London, ICTEM Building, Du Cane Road, London
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Pang KT, Ghim M, Sarathchandra P, Warboys CM, Yacoub MH, Chester AH, Weinberg PD. Shear-mediated ALK5 expression regulates endothelial activation. Biochem Biophys Res Commun 2023; 642:90-96. [PMID: 36566567 DOI: 10.1016/j.bbrc.2022.12.058] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2022] [Revised: 12/15/2022] [Accepted: 12/20/2022] [Indexed: 12/24/2022]
Abstract
Calcific aortic valve disease affects the aortic side of the valve, exposed to low magnitude multidirectional ("disturbed) blood flow, more than it affects the ventricular side, exposed to high magnitude uniaxial flow. Overt disease is preceded by endothelial dysfunction and inflammation. Here we investigate the potential role of the transforming growth factor-β (TGF-β) receptor ALK5 in this process. Although ECs are always subject to shear stress due to blood flow, and their responses to shear stress are important in healthy valve development and homeostasis, low magnitude multidirectional flow can induce pathophysiological changes. Previous work has shown ALK5 to be an important mechanosensor. ALK5 transduces mechanically sensed signals via the activation of the SMAD2/3 transcriptional modulators. However, it is currently unclear precisely how ALK5-mediated shear stress responses translate into pathological changes under conditions of chronically disturbed flow. Here, we demonstrate that ALK5 mechanosensory signalling influences flow-induced endothelial leukocyte adhesion and paracellular permeability. Low magnitude multidirectional flow resulted in downregulation of the receptor, accompanied by increased SMAD2 phosphorylation, in human umbilical vein endothelial cell (HUVEC) monolayers. These changes correlated with elevated monocyte adhesion and significantly increased transendothelial transport of an albumin-sized tracer. These effects were abolished by inhibition of ALK5 kinase activity. Analysis of ALK5 expression patterns in porcine aortic valve tissue corroborated the findings from cell-based experiments. Together, these results suggest that ALK5 has a role in shear stress-associated cardiovascular disease pathology, emphasising the importance of further mechanistic investigations and supporting it as a potential therapeutic target.
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Affiliation(s)
- Kuin Tian Pang
- Department of Bioengineering, Imperial College London, United Kingdom
| | - Mean Ghim
- Department of Bioengineering, Imperial College London, United Kingdom
| | - Padmini Sarathchandra
- Harefield Heart Science Centre, National Heart and Lung Institute, Imperial College London, United Kingdom
| | - Christina M Warboys
- Comparative Biomedical Sciences, The Royal Veterinary College, United Kingdom
| | - Magdi H Yacoub
- Harefield Heart Science Centre, National Heart and Lung Institute, Imperial College London, United Kingdom
| | - Adrian H Chester
- Harefield Heart Science Centre, National Heart and Lung Institute, Imperial College London, United Kingdom
| | - Peter D Weinberg
- Department of Bioengineering, Imperial College London, United Kingdom.
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Smits AIPM, Iop L, Chester AH. Editorial: Vascular and valvular tissue engineering: Treating and modeling vasculopathies and valvulopathies. Front Cardiovasc Med 2022; 9:1092102. [DOI: 10.3389/fcvm.2022.1092102] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2022] [Accepted: 11/18/2022] [Indexed: 12/02/2022] Open
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Iop L, Chester AH, Sampaio RO, Aikawa E. Editorial: Insight in heart valve disease: 2021. Front Cardiovasc Med 2022; 9:998862. [PMID: 36093133 PMCID: PMC9459379 DOI: 10.3389/fcvm.2022.998862] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2022] [Accepted: 08/12/2022] [Indexed: 11/13/2022] Open
Affiliation(s)
- Laura Iop
- Department of Cardiac Thoracic Vascular Sciences and Public Health, Padua Medical School, University of Padua, Padua, Italy
- *Correspondence: Laura Iop
| | - Adrian H. Chester
- Magdi Yacoub Institute, London, United Kingdom
- National Heart & Lung Institute, Imperial College London, London, United Kingdom
| | - Roney Orismar Sampaio
- Department of Cardiopneumology, São Paulo Medical School, University of São Paulo, São Paulo, Brazil
| | - Elena Aikawa
- Cardiovascular Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, United States
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Halawa S, Latif N, Tseng YT, Ibrahim AM, Chester AH, Moustafa A, Aguib Y, Yacoub MH. Profiling Genome-Wide DNA Methylation Patterns in Human Aortic and Mitral Valves. Front Cardiovasc Med 2022; 9:840647. [PMID: 35463757 PMCID: PMC9019152 DOI: 10.3389/fcvm.2022.840647] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2021] [Accepted: 03/11/2022] [Indexed: 12/05/2022] Open
Abstract
Cardiac valves exhibit highly complex structures and specialized functions that include dynamic interactions between cells, extracellular matrix (ECM) and their hemodynamic environment. Valvular gene expression is tightly regulated by a variety of mechanisms including epigenetic factors such as histone modifications, RNA-based mechanisms and DNA methylation. To date, methylation fingerprints of non-diseased human aortic and mitral valves have not been studied. In this work we analyzed the differential methylation profiles of 12 non-diseased aortic and mitral valve tissue samples (in matched pairs). Analysis of methylation data [reduced representation bisulfite sequencing (RRBS)] of 16,101 promoters genome-wide revealed 584 differentially methylated (DM) promoters, of which 13 were reported in endothelial mesenchymal trans-differentiation (EMT), 37 in aortic and mitral valve disease and 7 in ECM remodeling. Both functional classification as well as network analysis showed that the genes associated with the DM promoters were enriched for WNT-, Cadherin-, Endothelin-, PDGF-, HIF-1 and VEGF- signaling implicated in valvular physiology and pathophysiology. Additional enrichment was detected for TGFB-, NOTCH- and Integrin- signaling involved in EMT as well as ECM remodeling. This data provides the first insight into differential regulation of human aortic and mitral valve tissue and identifies candidate genes linked to DM promoters. Our work will improve the understanding of valve biology, valve tissue engineering approaches and contributes to the identification of relevant drug targets.
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Affiliation(s)
- Sarah Halawa
- Aswan Heart Centre, Aswan, Egypt
- Biotechnology Graduate Program, American University in Cairo, New Cairo, Egypt
- Sarah Halawa
| | - Najma Latif
- Heart Science Centre, Magdi Yacoub Institute, Harefield, United Kingdom
- National Heart and Lung Institute (NHLI), Imperial College London, London, United Kingdom
| | - Yuan-Tsan Tseng
- Heart Science Centre, Magdi Yacoub Institute, Harefield, United Kingdom
- National Heart and Lung Institute (NHLI), Imperial College London, London, United Kingdom
| | - Ayman M. Ibrahim
- Aswan Heart Centre, Aswan, Egypt
- Zoology Department, Faculty of Science, Cairo University, Giza, Egypt
| | - Adrian H. Chester
- Heart Science Centre, Magdi Yacoub Institute, Harefield, United Kingdom
- National Heart and Lung Institute (NHLI), Imperial College London, London, United Kingdom
| | - Ahmed Moustafa
- Biotechnology Graduate Program, American University in Cairo, New Cairo, Egypt
- Department of Biology, American University in Cairo, New Cairo, Egypt
| | - Yasmine Aguib
- Aswan Heart Centre, Aswan, Egypt
- National Heart and Lung Institute (NHLI), Imperial College London, London, United Kingdom
- Yasmine Aguib
| | - Magdi H. Yacoub
- Aswan Heart Centre, Aswan, Egypt
- Heart Science Centre, Magdi Yacoub Institute, Harefield, United Kingdom
- National Heart and Lung Institute (NHLI), Imperial College London, London, United Kingdom
- *Correspondence: Magdi H. Yacoub
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Latif N, Sarathchandra P, McCormack A, Yacoub MH, Chester AH. Atypical Expression of Smooth Muscle Markers and Co-activators and Their Regulation in Rheumatic Aortic and Calcified Bicuspid Valves. Front Cardiovasc Med 2022; 9:793666. [PMID: 35369286 PMCID: PMC8968087 DOI: 10.3389/fcvm.2022.793666] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2021] [Accepted: 02/22/2022] [Indexed: 11/14/2022] Open
Abstract
Objective We have previously reported that human calcified aortic cusps have abundant expression of smooth muscle (SM) markers and co-activators. We hypothesised that cells in bicuspid aortic valve (BAV) cusps and those affected by rheumatic heart valve (RHV) disease may follow a similar phenotypic transition into smooth muscle cells, a process that could be regulated by transforming growth factors (TGFs). Aims Cusps from eight patients with BAV and seven patients with RHV were analysed for early and late SM markers and regulators of SM gene expression by immunocytochemistry and compared to healthy aortic valves from 12 unused heart valve donors. The ability of TGFs to induce these markers in valve endothelial cells (VECs) on two substrates was assessed. Results In total, 7 out of 8 BAVs and all the RHVs showed an increased and atypical expression of early and late SM markers α-SMA, calponin, SM22 and SM-myosin. The SM marker co-activators were aberrantly expressed in six of the BAV and six of the RHV, in a similar regional pattern to the expression of SM markers. Additionally, regions of VECs, and endothelial cells lining the vessels within the cusps were found to be positive for SM markers and co-activators in three BAV and six RHV. Both BAVs and RHVs were significantly thickened and HIF1α expression was prominent in four BAVs and one RHV. The ability of TGFβs to induce the expression of SM markers and myocardin was greater in VECs cultured on fibronectin than on gelatin. Fibronectin was shown to be upregulated in BAVs and RHVs, within the cusps as well as in the basement membrane. Conclusion Bicuspid aortic valves and RHVs expressed increased numbers of SM marker-positive VICs and VECs. Concomittantly, these cells expressed MRTF-A and myocardin, key regulators of SM gene expression. TGFβ1 was able to preferentially upregulate SM markers and myocardin in VECs on fibronectin, and fibronectin was found to be upregulated in BAVs and RHVs. These findings suggest a role of VEC as a source of cells that express SM cell markers in BAVs and RHVs. The similarity between SM marker expression in BAVs and RHVs with our previous study with cusps from patients with aortic stenosis suggests the existance of a common pathological pathway between these different pathologies.
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Affiliation(s)
- Najma Latif
- Heart Science Centre, Magdi Yacoub Institute, Harefield, United Kingdom
- National Heart and Lung Institute, Imperial College London, London, United Kingdom
- *Correspondence: Najma Latif,
| | | | - Ann McCormack
- Heart Science Centre, Magdi Yacoub Institute, Harefield, United Kingdom
| | - Magdi H. Yacoub
- Heart Science Centre, Magdi Yacoub Institute, Harefield, United Kingdom
- National Heart and Lung Institute, Imperial College London, London, United Kingdom
| | - Adrian H. Chester
- Heart Science Centre, Magdi Yacoub Institute, Harefield, United Kingdom
- National Heart and Lung Institute, Imperial College London, London, United Kingdom
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Abstract
CD4+ T cells expressing choline acetyltransferase (ChAT) have recently been shown to cause a drop in systemic blood pressure when infused into mice. The aim of this study was to determine if ChAT-expressing T cells could regulate coronary vascular reactivity. Preconstricted segments of epicardial and intramyocardial porcine coronary arteries relaxed in response to Jurkat T cells (JT) that overexpressed ChAT (JTChAT cells). The efficacy of the JTChAT cells was similar in epicardial and intramyocardial vessels with a maximum dilator response to 3 × 105 cells/mL of 38.0 ± 6.7% and 38.7 ± 7.25%, respectively. In contrast, nontransfected JT cells elicited a weak dilator response, followed by a weak contraction. The response of JTChAT cells was dependent on the presence of the endothelial cells. In addition, the response could be significantly reduced by Nω-nitro-l-arginine methyl ester (l-NAME) and 1H-[1,2,4]oxadiazolo[4,3-a]quinoxalin-1-one (ODQ) in the presence of indomethacin. JTChAT cells, but not JT cells, increased the expression of phosphorylated endothelial nitric oxide synthase (eNOS). JTChAT cells contained significantly greater levels of acetylcholine compared with JT cells; however, the nonselective muscarinic antagonist atropine and the M1 receptor antagonist pirenzepine both failed to block the dilator effect of JTChAT cells. Exogenously added acetylcholine induced only a weak relaxation (∼10%) at low concentrations, which became a contractile response at higher concentrations. These data illustrate the capacity for cells that express ChAT to regulate coronary vascular reactivity, via mechanisms that are dependent on interaction with the endothelium and in part mediated by the release of nitric oxide.NEW & NOTEWORTHY This study shows ChAT-expressing T cells can induce vasodilation of the blood vessel in the coronary circulation and that this effect relies on a direct interaction between T cells and the coronary vascular endothelium. The study establishes a potential immunomodulatory role for T cells in the coronary circulation. The present findings offer an additional possibility that a deficiency of ChAT-expressing T cells could contribute to reduced coronary blood flow and ischemic events in the myocardium.
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Affiliation(s)
- Adrian H Chester
- Heart Science Centre, Magdi Yacoub Institute, Harefield, United Kingdom.,National Heart and Lung Institute, Imperial College London, London, United Kingdom
| | - Ann McCormack
- Heart Science Centre, Magdi Yacoub Institute, Harefield, United Kingdom
| | | | - Mohamed N Ahmed
- Department of Pediatrics, Steele Children's Research Center, The University of Arizona College of Medicine, Tucson, Arizona
| | - Magdi H Yacoub
- Heart Science Centre, Magdi Yacoub Institute, Harefield, United Kingdom
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Chester AH, Sarathchandra P, McCormack A, Yacoub MH. Organ Culture Model of Aortic Valve Calcification. Front Cardiovasc Med 2021; 8:734692. [PMID: 34660737 PMCID: PMC8517236 DOI: 10.3389/fcvm.2021.734692] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2021] [Accepted: 09/02/2021] [Indexed: 01/10/2023] Open
Abstract
A significant amount of knowledge has been gained with the use of cell-based assays to elucidate the mechanisms that mediate heart valve calcification. However, cells used in these studies lack their association with the extra-cellular matrix or the influence of other cellular components of valve leaflets. We have developed a model of calcification using intact porcine valve leaflets, that relies upon a biological stimulus to drive the formation of calcified nodules within the valve leaflets. Alizarin Red positive regions were formed in response to lipopolysaccharide and inorganic phosphate, which could be quantified when viewed under polarized light. Point analysis and elemental mapping analysis of electron microscope images confirmed the presence of nodules containing calcium and phosphorus. Immunohistochemical staining showed that the development of these calcified regions corresponded with the expression of RUNX2, osteocalcin, NF-kB and the apoptosis marker caspase 3. The formation of calcified nodules and the expression of bone markers were both inhibited by adenosine in a concentration-dependent manner, illustrating that the model is amenable to pharmacological manipulation. This organ culture model offers an increased level of tissue complexity in which to study the mechanisms that are involved in heart valve calcification.
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Affiliation(s)
- Adrian H Chester
- Heart Science Centre, Magdi Yacoub Institute, Harefield, United Kingdom.,National Heart & Lung Institute, Imperial College, Imperial College London, London, United Kingdom
| | - Padmini Sarathchandra
- National Heart & Lung Institute, Imperial College, Imperial College London, London, United Kingdom
| | - Ann McCormack
- National Heart & Lung Institute, Imperial College, Imperial College London, London, United Kingdom
| | - Magdi H Yacoub
- Heart Science Centre, Magdi Yacoub Institute, Harefield, United Kingdom.,National Heart & Lung Institute, Imperial College, Imperial College London, London, United Kingdom
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Parra-Izquierdo I, Sánchez-Bayuela T, López J, Gómez C, Pérez-Riesgo E, San Román JA, Sánchez Crespo M, Yacoub M, Chester AH, García-Rodríguez C. Interferons Are Pro-Inflammatory Cytokines in Sheared-Stressed Human Aortic Valve Endothelial Cells. Int J Mol Sci 2021; 22:ijms221910605. [PMID: 34638942 PMCID: PMC8508640 DOI: 10.3390/ijms221910605] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2021] [Revised: 09/24/2021] [Accepted: 09/25/2021] [Indexed: 02/07/2023] Open
Abstract
Calcific aortic valve disease (CAVD) is an athero-inflammatory process. Growing evidence supports the inflammation-driven calcification model, mediated by cytokines such as interferons (IFNs) and tumor necrosis factor (TNF)-α. Our goal was investigating IFNs' effects in human aortic valve endothelial cells (VEC) and the potential differences between aortic (aVEC) and ventricular (vVEC) side cells. The endothelial phenotype was analyzed by Western blot, qPCR, ELISA, monocyte adhesion, and migration assays. In mixed VEC populations, IFNs promoted the activation of signal transducers and activators of transcription-1 and nuclear factor-κB, and the subsequent up-regulation of pro-inflammatory molecules. Side-specific VEC were activated with IFN-γ and TNF-α in an orbital shaker flow system. TNF-α, but not IFN-γ, induced hypoxia-inducible factor (HIF)-1α stabilization or endothelial nitric oxide synthase downregulation. Additionally, IFN-γ inhibited TNF-α-induced migration of aVEC. Also, IFN-γ triggered cytokine secretion and adhesion molecule expression in aVEC and vVEC. Finally, aVEC were more prone to cytokine-mediated monocyte adhesion under multiaxial flow conditions as compared with uniaxial flow. In conclusion, IFNs promote inflammation and reduce TNF-α-mediated migration in human VEC. Moreover, monocyte adhesion was higher in inflamed aVEC sheared under multiaxial flow, which may be relevant to understanding the initial stages of CAVD.
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Affiliation(s)
- Iván Parra-Izquierdo
- Instituto de Biología y Genética Molecular, Spanish National Research Council (CSIC), Universidad de Valladolid, 47003 Valladolid, Spain; (I.P.-I.); (T.S.-B.); (C.G.); (E.P.-R.); (M.S.C.)
| | - Tania Sánchez-Bayuela
- Instituto de Biología y Genética Molecular, Spanish National Research Council (CSIC), Universidad de Valladolid, 47003 Valladolid, Spain; (I.P.-I.); (T.S.-B.); (C.G.); (E.P.-R.); (M.S.C.)
| | - Javier López
- ICICOR, Hospital Clínico Universitario, 47005 Valladolid, Spain; (J.L.); (J.A.S.R.)
- Centro de Investigación Biomédica en Red en Enfermedades Cardiovasculares (CIBERCV), 28029 Madrid, Spain
| | - Cristina Gómez
- Instituto de Biología y Genética Molecular, Spanish National Research Council (CSIC), Universidad de Valladolid, 47003 Valladolid, Spain; (I.P.-I.); (T.S.-B.); (C.G.); (E.P.-R.); (M.S.C.)
| | - Enrique Pérez-Riesgo
- Instituto de Biología y Genética Molecular, Spanish National Research Council (CSIC), Universidad de Valladolid, 47003 Valladolid, Spain; (I.P.-I.); (T.S.-B.); (C.G.); (E.P.-R.); (M.S.C.)
| | - J. Alberto San Román
- ICICOR, Hospital Clínico Universitario, 47005 Valladolid, Spain; (J.L.); (J.A.S.R.)
- Centro de Investigación Biomédica en Red en Enfermedades Cardiovasculares (CIBERCV), 28029 Madrid, Spain
| | - Mariano Sánchez Crespo
- Instituto de Biología y Genética Molecular, Spanish National Research Council (CSIC), Universidad de Valladolid, 47003 Valladolid, Spain; (I.P.-I.); (T.S.-B.); (C.G.); (E.P.-R.); (M.S.C.)
| | - Magdi Yacoub
- National Heart & Lung Institute, Imperial College London, London SW3 6LR, UK;
- Magdi Yacoub Institute, Harefield UB9 6JH, UK
| | - Adrian H. Chester
- National Heart & Lung Institute, Imperial College London, London SW3 6LR, UK;
- Magdi Yacoub Institute, Harefield UB9 6JH, UK
- Correspondence: (A.H.C.); (C.G.-R.); Tel.: +44-(0)1895-760732 (A.H.C.); +34-983-184841 (C.G.-R.)
| | - Carmen García-Rodríguez
- Instituto de Biología y Genética Molecular, Spanish National Research Council (CSIC), Universidad de Valladolid, 47003 Valladolid, Spain; (I.P.-I.); (T.S.-B.); (C.G.); (E.P.-R.); (M.S.C.)
- Centro de Investigación Biomédica en Red en Enfermedades Cardiovasculares (CIBERCV), 28029 Madrid, Spain
- Correspondence: (A.H.C.); (C.G.-R.); Tel.: +44-(0)1895-760732 (A.H.C.); +34-983-184841 (C.G.-R.)
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12
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Wray J, Pagel C, Chester AH, Kennedy F, Crowe S. What was the impact of the first wave of COVID-19 on the delivery of care to children and adults with congenital heart disease? A qualitative study using online forums. BMJ Open 2021; 11:e049006. [PMID: 34593493 PMCID: PMC8487016 DOI: 10.1136/bmjopen-2021-049006] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
OBJECTIVES Globally, healthcare systems have been stretched to the limit by the COVID-19 pandemic. Significant changes have had to be made to the way in which non-COVID-19-related care has been delivered. Our objective was to understand, from the perspective of patients with a chronic, life-long condition (congenital heart disease, CHD) and their parents/carers, the impact of COVID-19 on the delivery of care, how changes were communicated and whether healthcare providers should do anything differently in a subsequent wave of COVID-19 infections. DESIGN AND SETTING Qualitative study involving a series of asynchronous discussion forums set up and moderated by three patient charities via their Facebook pages. PARTICIPANTS Patients with CHD and parents/carers of patients with CHD. MAIN OUTCOME MEASURES Qualitative responses to questions posted on the discussion forums. RESULTS The forums ran over a 6-week period and involved 109 participants. Following thematic analysis, we identified three themes and 10 subthemes related to individual condition-related factors, patient-related factors and health professional/centre factors that may have influenced how patients and parents/carers experienced changes to service delivery as a result of COVID-19. Specifically, respondents reported high levels of disruption to the delivery of care, inconsistent advice and messaging and variable communication from health professionals, with examples of both excellent and very poor experiences of care reported. Uncertainty about follow-up and factors related to the complexity and stability of their condition contributed to anxiety and stress. CONCLUSIONS The importance of clear, consistent communication cannot be over-estimated. Our findings, while collected in relation to patients with CHD, are not necessarily specific to this population and we believe that they reflect the experiences of many thousands of people with life-long conditions in the UK. Recommendations related to communication, service delivery and support during the pandemic may improve patients' experience of care and, potentially, their outcomes.
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Affiliation(s)
- Jo Wray
- Heart and Lung Directorate, Great Ormond Street Hospital for Children NHS Foundation Trust, London, UK
- Research Department of Children's Cardiovascular Diseases, Institute of Cardiovascular Science, University College London, London, UK
| | - Christina Pagel
- Clinical Operational Research Unit, Department of Mathematics, University College London, London, UK
| | - Adrian H Chester
- Heart Valve Research Group, The Magdi Yacoub Institute, Heart Science Centre, Harefield, UK
- Myocardial Function, National Heart and Lung Institute, Imperial College London, London, UK
| | - Fiona Kennedy
- Adult Congenital Heart Disease Department, Barts Health NHS Trust, London, UK
| | - Sonya Crowe
- Clinical Operational Research Unit, Department of Mathematics, University College London, London, UK
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13
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Pang KT, Ghim M, Liu C, Tay HM, Fhu CW, Chia RN, Qiu B, Sarathchandra P, Chester AH, Yacoub MH, Wilkinson FL, Weston R, Warboys CM, Hou HW, Weinberg PD, Wang X. Leucine-Rich α-2-Glycoprotein 1 Suppresses Endothelial Cell Activation Through ADAM10-Mediated Shedding of TNF-α Receptor. Front Cell Dev Biol 2021; 9:706143. [PMID: 34291056 PMCID: PMC8288075 DOI: 10.3389/fcell.2021.706143] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2021] [Accepted: 06/09/2021] [Indexed: 11/13/2022] Open
Abstract
Elevated serum concentrations of leucine-rich α-2-glycoprotein (LRG1) have been reported in patients with inflammatory, autoimmune, and cardiovascular diseases. This study aims to investigate the role of LRG1 in endothelial activation. LRG1 in endothelial cells (ECs) of arteries and serum of patients with critical limb ischemia (CLI) was assessed by immunohistochemistry and ELISA, respectively. LRG1 expression in sheared and tumor necrosis factor-α (TNF-α)-treated ECs was analyzed. The mechanistic role of LRG1 in endothelial activation was studied in vitro. Plasma of 37-week-old Lrg1 -/- mice was used to investigate causality between LRG1 and tumor necrosis factor receptor 1 (TNFR1) shedding. LRG1 was highly expressed in ECs of stenotic but not normal arteries. LRG1 concentrations in serum of patients with CLI were elevated compared to healthy controls. LRG1 expression was shear dependent. It could be induced by TNF-α, and the induction of its expression was mediated by NF-κB activation. LRG1 inhibited TNF-α-induced activation of NF-κB signaling, expression of VCAM-1 and ICAM-1, and monocyte capture, firm adhesion, and transendothelial migration. Mechanistically, LRG1 exerted its function by causing the shedding of TNFR1 via the ALK5-SMAD2 pathway and the subsequent activation of ADAM10. Consistent with this mechanism, LRG1 and sTNFR1 concentrations were correlated in the serum of CLI patients. Causality between LRG1 and TNFR1 shedding was established by showing that Lrg1 -/- mice had lower plasma sTNFR1 concentrations than wild type mice. Our results demonstrate a novel role for LRG1 in endothelial activation and its potential therapeutic role in inflammatory diseases should be investigated further.
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Affiliation(s)
- Kuin Tian Pang
- Department of Bioengineering, Imperial College London, London, United Kingdom.,Institute of Molecular and Cell Biology, Agency for Science, Technology and Research (A∗STAR), Singapore, Singapore
| | - Mean Ghim
- Department of Bioengineering, Imperial College London, London, United Kingdom
| | - Chenghao Liu
- Lee Kong Chian School of Medicine, Nanyang Technological University, Singapore, Singapore
| | - Hui Min Tay
- Lee Kong Chian School of Medicine, Nanyang Technological University, Singapore, Singapore.,School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore, Singapore
| | - Chee Wai Fhu
- Cancer Science Institute of Singapore, National University of Singapore, Singapore
| | - Rui Ning Chia
- Centre for Vision Research, Duke-NUS Medical School, Singapore, Singapore
| | - Beiying Qiu
- Centre for Vision Research, Duke-NUS Medical School, Singapore, Singapore
| | - Padmini Sarathchandra
- Harefield Heart Science Centre, National Heart and Lung Institute, Imperial College London, London, United Kingdom
| | - Adrian H Chester
- Harefield Heart Science Centre, National Heart and Lung Institute, Imperial College London, London, United Kingdom
| | - Magdi H Yacoub
- Harefield Heart Science Centre, National Heart and Lung Institute, Imperial College London, London, United Kingdom
| | - Fiona L Wilkinson
- Department of Life Sciences, Manchester Metropolitan University, Manchester, United Kingdom
| | - Ria Weston
- Department of Life Sciences, Manchester Metropolitan University, Manchester, United Kingdom
| | - Christina M Warboys
- Comparative Biomedical Sciences, The Royal Veterinary College, London, United Kingdom
| | - Han Wei Hou
- Lee Kong Chian School of Medicine, Nanyang Technological University, Singapore, Singapore.,School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore, Singapore
| | - Peter D Weinberg
- Department of Bioengineering, Imperial College London, London, United Kingdom
| | - Xiaomeng Wang
- Institute of Molecular and Cell Biology, Agency for Science, Technology and Research (A∗STAR), Singapore, Singapore.,Centre for Vision Research, Duke-NUS Medical School, Singapore, Singapore.,Singapore Eye Research Institute, Singapore, Singapore
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14
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Al-Shammari H, Latif N, Sarathchandra P, McCormack A, Rog-Zielinska EA, Raja S, Kohl P, Yacoub MH, Peyronnet R, Chester AH. Expression and function of mechanosensitive ion channels in human valve interstitial cells. PLoS One 2020; 15:e0240532. [PMID: 33057457 PMCID: PMC7561104 DOI: 10.1371/journal.pone.0240532] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2020] [Accepted: 09/28/2020] [Indexed: 11/21/2022] Open
Abstract
Background The ability of heart valve cells to respond to their mechanical environment represents a key mechanism by which the integrity and function of valve cusps is maintained. A number of different mechanotransduction pathways have been implicated in the response of valve cells to mechanical stimulation. In this study, we explore the expression pattern of several mechanosensitive ion channels (MSC) and their potential to mediate mechanosensitive responses of human valve interstitial cells (VIC). Methods MSC presence and function were probed using the patch clamp technique. Protein abundance of key MSC was evaluated by Western blotting in isolated fibroblastic VIC (VICFB) and in VIC differentiated towards myofibroblastic (VICMB) or osteoblastic (VICOB) phenotypes. Expression was compared in non-calcified and calcified human aortic valves. MSC contributions to stretch-induced collagen gene expression and to VIC migration were assessed by pharmacological inhibition of specific channels. Results Two MSC types were recorded in VICFB: potassium selective and cation non-selective channels. In keeping with functional data, the presence of both TREK-1 and Kir6.1 (potassium selective), as well as TRPM4, TRPV4 and TRPC6 (cationic non-selective) channels was confirmed in VIC at the protein level. Differentiation of VICFB into VICMB or VICOB phenotypes was associated with a lower expression of TREK-1 and Kir6.1, and a higher expression of TRPV4 and TRPC6. Differences in MSC expression were also seen in non-calcified vs calcified aortic valves where TREK-1, TRPM4 and TRPV4 expression were higher in calcified compared to control tissues. Cyclic stretch-induced expression of COL I mRNA in cultured VICFB was blocked by RN-9893, a selective inhibitor of TRPV4 channels while having no effect on the stretch-induced expression of COL III. VICFB migration was blocked with the non-specific MSC blocker streptomycin and by GSK417651A an inhibitor of TRPC6/3. Conclusion Aortic VIC express a range of MSC that play a role in functional responses of these cells to mechanical stimulation. MSC expression levels differ in calcified and non-calcified valves in ways that are in part compatible with the change in expression seen between VIC phenotypes. These changes in MSC expression, and associated alterations in the ability of VIC to respond to their mechanical environment, may form novel targets for intervention during aortic valvulopathies.
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Affiliation(s)
- Hessah Al-Shammari
- National Heart & Lung Institute, Imperial College London, London, United Kingdom
| | - Najma Latif
- National Heart & Lung Institute, Imperial College London, London, United Kingdom
- Heart Science Centre, Magdi Yacoub Institute, Harefield, United Kingdom
| | | | - Ann McCormack
- Heart Science Centre, Magdi Yacoub Institute, Harefield, United Kingdom
| | - Eva A. Rog-Zielinska
- Institute for Experimental Cardiovascular Medicine, University Heart Center Freiburg, Bad Krozingen, and Faculty of Medicine, University of Freiburg, Freiburg, Germany
| | - Shahzad Raja
- Harefield Hospital, Royal Brompton & Harefield NHS Foundation Trust, Harefield, United Kingdom
| | - Peter Kohl
- Institute for Experimental Cardiovascular Medicine, University Heart Center Freiburg, Bad Krozingen, and Faculty of Medicine, University of Freiburg, Freiburg, Germany
| | - Magdi H. Yacoub
- National Heart & Lung Institute, Imperial College London, London, United Kingdom
- Heart Science Centre, Magdi Yacoub Institute, Harefield, United Kingdom
| | - Rémi Peyronnet
- Heart Science Centre, Magdi Yacoub Institute, Harefield, United Kingdom
- Institute for Experimental Cardiovascular Medicine, University Heart Center Freiburg, Bad Krozingen, and Faculty of Medicine, University of Freiburg, Freiburg, Germany
| | - Adrian H. Chester
- National Heart & Lung Institute, Imperial College London, London, United Kingdom
- Heart Science Centre, Magdi Yacoub Institute, Harefield, United Kingdom
- * E-mail:
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15
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Chester AH, Grande-Allen KJ. Which Biological Properties of Heart Valves Are Relevant to Tissue Engineering? Front Cardiovasc Med 2020; 7:63. [PMID: 32373630 PMCID: PMC7186395 DOI: 10.3389/fcvm.2020.00063] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2019] [Accepted: 03/27/2020] [Indexed: 12/30/2022] Open
Abstract
Over the last 20 years, the designs of tissue engineered heart valves have evolved considerably. An initial focus on replicating the mechanical and structural features of semilunar valves has expanded to endeavors to mimic the biological behavior of heart valve cells as well. Studies on the biology of heart valves have shown that the function and durability of native valves is underpinned by complex interactions between the valve cells, the extracellular matrix, and the mechanical environment in which heart valves function. The ability of valve interstitial cells to synthesize extracellular matrix proteins and remodeling enzymes and the protective mediators released by endothelial cells are key factors in the homeostasis of valve function. The extracellular matrix provides the mechanical strength and flexibility required for the valve to function, as well as communicating with the cells that are bound within. There are a number of regulatory mechanisms that influence valve function, which include neuronal mechanisms and the tight regulation of growth and angiogenic factors. Together, studies into valve biology have provided a blueprint for what a tissue engineered valve would need to be capable of, in order to truly match the function of the native valve. This review addresses the biological functions of heart valve cells, in addition to the influence of the cells' environment on this behavior and examines how well these functions are addressed within the current strategies for tissue engineering heart valves in vitro, in vivo, and in situ.
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Affiliation(s)
- Adrian H Chester
- Heart Science Centre, The Magdi Yacoub Institute, Harefield, United Kingdom
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16
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Haikal RR, Hua C, Perry JJ, O'Nolan D, Syed I, Kumar A, Chester AH, Zaworotko MJ, Yacoub MH, Alkordi MH. Controlling the Uptake and Regulating the Release of Nitric Oxide in Microporous Solids. ACS Appl Mater Interfaces 2017; 9:43520-43528. [PMID: 29182298 DOI: 10.1021/acsami.7b15095] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Representative compounds from three classes of microporous solids, namely, metal-organic frameworks (MOFs), hybrid ultra-microporous materials (HUMs), and porous-organic polymers (POPs), were investigated for their nitric oxide gas uptake and release behavior. Low-pressure sorption studies indicated strong chemisorption of NO on the free amine groups decorating the MOF UiO-66-NH2 when compared to its non-amine-functionalized parent. The HUMs demonstrated reversible physisorption within the low-pressure regime, but interestingly in one case there was evidence for chemisorption following pressurization with NO at 10 bar. Significant release of chemisorbed NO from the UiO-66-NH2 and one of the HUMs was triggered by addition of acid to the medium, a pH change from 7.4 to 5.4 being sufficient to trigger NO release. An imidazole-based POP exhibited chemisorption of NO at high pressure wherein the ring basicity facilitated both NO uptake and spontaneous release upon contact with the aqueous release medium.
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Affiliation(s)
- Rana R Haikal
- Center for Materials Science, Zewail City of Science and Technology , Sheikh Zayed Dist., 12588 Giza, Egypt
| | - Carol Hua
- Bernal Institute, Department of Chemical Sciences, University of Limerick , Limerick V94 T9PX, Ireland
| | - John J Perry
- Bernal Institute, Department of Chemical Sciences, University of Limerick , Limerick V94 T9PX, Ireland
| | - Daniel O'Nolan
- Bernal Institute, Department of Chemical Sciences, University of Limerick , Limerick V94 T9PX, Ireland
| | - Imran Syed
- Bernal Institute, Department of Chemical Sciences, University of Limerick , Limerick V94 T9PX, Ireland
| | - Amrit Kumar
- Bernal Institute, Department of Chemical Sciences, University of Limerick , Limerick V94 T9PX, Ireland
| | - Adrian H Chester
- Heart Science Centre, Imperial College , Harefield, Uxbridge UB9 6JH, United Kingdom
| | - Michael J Zaworotko
- Bernal Institute, Department of Chemical Sciences, University of Limerick , Limerick V94 T9PX, Ireland
| | - Magdi H Yacoub
- Heart Science Centre, Imperial College , Harefield, Uxbridge UB9 6JH, United Kingdom
| | - Mohamed H Alkordi
- Center for Materials Science, Zewail City of Science and Technology , Sheikh Zayed Dist., 12588 Giza, Egypt
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17
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You AYF, Bergholt MS, St-Pierre JP, Kit-Anan W, Pence IJ, Chester AH, Yacoub MH, Bertazzo S, Stevens MM. Raman spectroscopy imaging reveals interplay between atherosclerosis and medial calcification in the human aorta. Sci Adv 2017; 3:e1701156. [PMID: 29226241 PMCID: PMC5721727 DOI: 10.1126/sciadv.1701156] [Citation(s) in RCA: 49] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/11/2017] [Accepted: 11/09/2017] [Indexed: 05/21/2023]
Abstract
Medial calcification in the human aorta accumulates during aging and is known to be aggravated in several diseases. Atherosclerosis, another major cause of cardiovascular calcification, shares some common aggravators. However, the mechanisms of cardiovascular calcification remain poorly understood. To elucidate the relationship between medial aortic calcification and atherosclerosis, we characterized the cross-sectional distributions of the predominant minerals in aortic tissue, apatite and whitlockite, and the associated extracellular matrix. We also compared the cellular changes between atherosclerotic and nonatherosclerotic human aortic tissues. This was achieved through the development of Raman spectroscopy imaging methods that adapted algorithms to distinguish between the major biomolecules present within these tissues. We present a relationship between apatite, cholesterol, and triglyceride in atherosclerosis, with the relative amount of all molecules concurrently increased in the atherosclerotic plaque. Further, the increase in apatite was disproportionately large in relation to whitlockite in the aortic media directly underlying a plaque, indicating that apatite is more pathologically significant in atherosclerosis-aggravated medial calcification. We also discovered a reduction of β-carotene in the whole aortic intima, including a plaque in atherosclerotic aortic tissues compared to nonatherosclerotic tissues. This unprecedented biomolecular characterization of the aortic tissue furthers our understanding of pathological and physiological cardiovascular calcification events in humans.
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Affiliation(s)
- Amanda Y. F. You
- Department of Materials, Imperial College London, London SW7 2AZ, UK
- Department of Bioengineering, Imperial College London, London SW7 2AZ, UK
- Institute of Biomedical Engineering, Imperial College London, London SW7 2AZ, UK
| | - Mads S. Bergholt
- Department of Materials, Imperial College London, London SW7 2AZ, UK
- Department of Bioengineering, Imperial College London, London SW7 2AZ, UK
- Institute of Biomedical Engineering, Imperial College London, London SW7 2AZ, UK
| | - Jean-Philippe St-Pierre
- Department of Materials, Imperial College London, London SW7 2AZ, UK
- Department of Bioengineering, Imperial College London, London SW7 2AZ, UK
- Institute of Biomedical Engineering, Imperial College London, London SW7 2AZ, UK
| | - Worrapong Kit-Anan
- Department of Materials, Imperial College London, London SW7 2AZ, UK
- Department of Bioengineering, Imperial College London, London SW7 2AZ, UK
- Institute of Biomedical Engineering, Imperial College London, London SW7 2AZ, UK
| | - Isaac J. Pence
- Department of Materials, Imperial College London, London SW7 2AZ, UK
- Department of Bioengineering, Imperial College London, London SW7 2AZ, UK
- Institute of Biomedical Engineering, Imperial College London, London SW7 2AZ, UK
| | - Adrian H. Chester
- National Heart and Lung Institute, Harefield Heart Science Centre, Imperial College London, Harefield, Middlesex UB9 6JH, UK
| | - Magdi H. Yacoub
- National Heart and Lung Institute, Harefield Heart Science Centre, Imperial College London, Harefield, Middlesex UB9 6JH, UK
| | - Sergio Bertazzo
- Department of Medical Physics and Biomedical Engineering, University College London, Malet Place Engineering Building, London WC1E 6BT, UK
| | - Molly M. Stevens
- Department of Materials, Imperial College London, London SW7 2AZ, UK
- Department of Bioengineering, Imperial College London, London SW7 2AZ, UK
- Institute of Biomedical Engineering, Imperial College London, London SW7 2AZ, UK
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18
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Krishnamoorthy N, Tseng YT, Gajendrarao P, Sarathchandra P, McCormack A, Carubelli I, Sohier J, Latif N, Chester AH, Yacoub MH. A Strategy to Enhance Secretion of Extracellular Matrix Components by Stem Cells: Relevance to Tissue Engineering. Tissue Eng Part A 2017; 24:145-156. [PMID: 28467727 DOI: 10.1089/ten.tea.2017.0060] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Abstract
The ability of cells to secrete extracellular matrix proteins is an important property in the repair, replacement, and regeneration of living tissue. Cells that populate tissue-engineered constructs need to be able to emulate these functions. The motifs, KTTKS or palmitoyl-KTTKS (peptide amphiphile), have been shown to stimulate production of collagen and fibronectin in differentiated cells. Molecular modeling was used to design different forms of active peptide motifs to enhance the efficacy of peptides to increase collagen and fibronectin production using terminals KTTKS/SKTTK/SKTTKS connected by various hydrophobic linkers, V4A3/V4A2/A4G3. Molecular dynamic simulations showed SKTTKS-V4A3-SKTTKS (P3), with palindromic (SKTTKS) motifs and SKTTK-V4A2-KTTKS (P5), maintained structural integrity and favorable surface electrostatic distributions that are required for functionality. In vitro studies showed that peptides, P3 and P5, showed low toxicity to human adipose-derived stem cells (hADSCs) and significantly increased the production of collagen and fibronectin in a concentration-dependent manner compared with the original active peptide motif. The 4-day treatment showed that stem cell markers of hADSCs remained stable with P3. The molecular design of novel peptides is a promising strategy for the development of intelligent biomaterials to guide stem cell function for tissue engineering applications.
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Affiliation(s)
- Navaneethakrishnan Krishnamoorthy
- 1 Division of Cardiovascular Research (QCRC), Qatar Foundation, Sidra Medical and Research Centre , Doha, Qatar .,2 Division of Translational Medicine (Experimental Genetics), Sidra Medical and Research Centre , Doha, Qatar .,3 National Heart and Lung Institute, Heart Science Centre, Imperial College London , Middlesex, United Kingdom
| | - Yuan-Tsan Tseng
- 1 Division of Cardiovascular Research (QCRC), Qatar Foundation, Sidra Medical and Research Centre , Doha, Qatar .,3 National Heart and Lung Institute, Heart Science Centre, Imperial College London , Middlesex, United Kingdom
| | - Poornima Gajendrarao
- 1 Division of Cardiovascular Research (QCRC), Qatar Foundation, Sidra Medical and Research Centre , Doha, Qatar .,3 National Heart and Lung Institute, Heart Science Centre, Imperial College London , Middlesex, United Kingdom
| | - Padmini Sarathchandra
- 3 National Heart and Lung Institute, Heart Science Centre, Imperial College London , Middlesex, United Kingdom
| | - Ann McCormack
- 3 National Heart and Lung Institute, Heart Science Centre, Imperial College London , Middlesex, United Kingdom
| | - Ivan Carubelli
- 3 National Heart and Lung Institute, Heart Science Centre, Imperial College London , Middlesex, United Kingdom
| | - Jerome Sohier
- 4 INSERM U 791, Laboratory for Osteoarticular and Dental Tissue Engineering (LIOAD), University of Nantes , Nantes, France
| | - Najma Latif
- 3 National Heart and Lung Institute, Heart Science Centre, Imperial College London , Middlesex, United Kingdom
| | - Adrian H Chester
- 3 National Heart and Lung Institute, Heart Science Centre, Imperial College London , Middlesex, United Kingdom
| | - Magdi H Yacoub
- 1 Division of Cardiovascular Research (QCRC), Qatar Foundation, Sidra Medical and Research Centre , Doha, Qatar .,3 National Heart and Lung Institute, Heart Science Centre, Imperial College London , Middlesex, United Kingdom
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Abstract
The pathogenesis of pulmonary arterial hypertension remains undefined. Changes in the expression and effects mediated by a number of vasoactive factors have been implicated to play a role in the onset and progression of the disease. The source of many of these mediators, such as nitric oxide (NO), prostacyclin and endothelin-1 (ET-1), is the pulmonary endothelium. This article focus in the role of nitric oxide in PAH, reviewing the evidence for its involvement in regulation of pulmonary a vascular tone under physiological conditions, the mechanisms by which it can contribute to the pathological changes seen in PAH and strategies for the use of NO as a therapy for treatment of the disease.
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Affiliation(s)
- Adrian H Chester
- National Heart & Lung Institute, Imperial College London, Heart Science Centre, Harefield, Middlesex, UB9 6JH, United Kingdom
| | - Magdi H Yacoub
- National Heart & Lung Institute, Imperial College London, Heart Science Centre, Harefield, Middlesex, UB9 6JH, United Kingdom
| | - Salvador Moncada
- School of Medical Sciences, Manchester Cancer Research Centre, University of Manchester, Wilmslow Road, Manchester, M20 4QL, United Kingdom
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20
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Mohamed NA, Davies RP, Lickiss PD, Ahmetaj-Shala B, Reed DM, Gashaw HH, Saleem H, Freeman GR, George PM, Wort SJ, Morales-Cano D, Barreira B, Tetley TD, Chester AH, Yacoub MH, Kirkby NS, Moreno L, Mitchell JA. Chemical and biological assessment of metal organic frameworks (MOFs) in pulmonary cells and in an acute in vivo model: relevance to pulmonary arterial hypertension therapy. Pulm Circ 2017; 7:643-653. [PMID: 28447910 PMCID: PMC5841901 DOI: 10.1177/2045893217710224] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/03/2023] Open
Abstract
Pulmonary arterial hypertension (PAH) is a progressive and debilitating condition. Despite promoting vasodilation, current drugs have a therapeutic window within which they are limited by systemic side effects. Nanomedicine uses nanoparticles to improve drug delivery and/or reduce side effects. We hypothesize that this approach could be used to deliver PAH drugs avoiding the systemic circulation. Here we report the use of iron metal organic framework (MOF) MIL-89 and PEGylated MIL-89 (MIL-89 PEG) as suitable carriers for PAH drugs. We assessed their effects on viability and inflammatory responses in a wide range of lung cells including endothelial cells grown from blood of donors with/without PAH. Both MOFs conformed to the predicted structures with MIL-89 PEG being more stable at room temperature. At concentrations up to 10 or 30 µg/mL, toxicity was only seen in pulmonary artery smooth muscle cells where both MOFs reduced cell viability and CXCL8 release. In endothelial cells from both control donors and PAH patients, both preparations inhibited the release of CXCL8 and endothelin-1 and in macrophages inhibited inducible nitric oxide synthase activity. Finally, MIL-89 was well-tolerated and accumulated in the rat lungs when given in vivo. Thus, the prototypes MIL-89 and MIL-89 PEG with core capacity suitable to accommodate PAH drugs are relatively non-toxic and may have the added advantage of being anti-inflammatory and reducing the release of endothelin-1. These data are consistent with the idea that these materials may not only be useful as drug carriers in PAH but also offer some therapeutic benefit in their own right.
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Affiliation(s)
- Nura A Mohamed
- 1 Department of Cardiothoracic Pharmacology, National Heart and Lung Institute, Imperial College, London, UK.,2 Heart Science Centre at Harefield Hospital, Harefield, UK.,3 Qatar Foundation Research and Development Division, Doha, Qatar
| | - Robert P Davies
- 4 Department of Chemistry, South Kensington Campus, Imperial College, London, UK
| | - Paul D Lickiss
- 4 Department of Chemistry, South Kensington Campus, Imperial College, London, UK
| | - Blerina Ahmetaj-Shala
- 1 Department of Cardiothoracic Pharmacology, National Heart and Lung Institute, Imperial College, London, UK
| | - Daniel M Reed
- 1 Department of Cardiothoracic Pharmacology, National Heart and Lung Institute, Imperial College, London, UK
| | - Hime H Gashaw
- 1 Department of Cardiothoracic Pharmacology, National Heart and Lung Institute, Imperial College, London, UK
| | - Hira Saleem
- 4 Department of Chemistry, South Kensington Campus, Imperial College, London, UK
| | - Gemma R Freeman
- 4 Department of Chemistry, South Kensington Campus, Imperial College, London, UK
| | - Peter M George
- 1 Department of Cardiothoracic Pharmacology, National Heart and Lung Institute, Imperial College, London, UK
| | - Stephen J Wort
- 1 Department of Cardiothoracic Pharmacology, National Heart and Lung Institute, Imperial College, London, UK
| | - Daniel Morales-Cano
- 5 Department of Pharmacology, Faculty of Medicine, Universidad Complutense de Madrid- Instituto de Investigacion Sanitaria Gregorio Marañón (IiSGM), Ciber Enfermedades Respiratorias (CIBERES), Spain
| | - Bianca Barreira
- 5 Department of Pharmacology, Faculty of Medicine, Universidad Complutense de Madrid- Instituto de Investigacion Sanitaria Gregorio Marañón (IiSGM), Ciber Enfermedades Respiratorias (CIBERES), Spain
| | - Teresa D Tetley
- 6 Lung Cell Biology Group, National Heart and Lung Institute, Imperial College London, London, UK
| | | | - Magdi H Yacoub
- 2 Heart Science Centre at Harefield Hospital, Harefield, UK
| | - Nicholas S Kirkby
- 1 Department of Cardiothoracic Pharmacology, National Heart and Lung Institute, Imperial College, London, UK
| | - Laura Moreno
- 5 Department of Pharmacology, Faculty of Medicine, Universidad Complutense de Madrid- Instituto de Investigacion Sanitaria Gregorio Marañón (IiSGM), Ciber Enfermedades Respiratorias (CIBERES), Spain
| | - Jane A Mitchell
- 1 Department of Cardiothoracic Pharmacology, National Heart and Lung Institute, Imperial College, London, UK
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Kaniewska-Bednarczuk E, Mielcarek M, Chester AH, Slominska EM, Yacoub MH, Smolenski RT. Oxidized low-density lipoproteins enhance expression and activity of CD39 and CD73 in the human aortic valve endothelium. Nucleosides Nucleotides Nucleic Acids 2017; 35:713-719. [PMID: 27906627 DOI: 10.1080/15257770.2016.1163377] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Extracellular nucleotides regulate thrombosis, inflammation, and immune response. Ectonucleoside triphosphate diphosphohydrolase 1 (CD39) and ecto-5'-nucleotidase (CD73) convert extracellular nucleotides in a sequential order: ATP to ADP, AMP, and then to adenosine. In this study, we aimed to test an effect of oxidized low-density lipoprotein (ox-LDL) on CD39 and CD73 in endothelial cells. Human aortic valve endothelial cells were exposed to ox-LDL for 24-48 h. Next, the activity, protein expression, and mRNA transcripts level of CD39 and CD73 were characterized by an incubation with ATP or AMP followed by high-performance liquid chromatography analysis of media as well as western blots and qPCR. CD73 activity in human valve endothelial cells was increased in presence of ox-LDL (4.04 ± 0.32 nmol/mg prot./min, mean +/- SEM) as compared with control (2.75 ± 0.21 nmol/mg prot/min). There was almost no effect of ox-LDL on CD39 activity. A similar effect was observed for mRNA and protein expression. In conclusion, we found that ox-LDL modulated CD39 and CD73 activity in the endothelium, which may contribute to relevant pathologies and featured treatments.
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Affiliation(s)
- Ewa Kaniewska-Bednarczuk
- a Department of Biochemistry , Medical University of Gdansk , Gdansk , Poland.,b Heart Science Centre , Imperial College London at Harefield Hospital , Harefield , UK
| | - Michał Mielcarek
- c Department of Life Sciences , Imperial College London , London, UK
| | - Adrian H Chester
- b Heart Science Centre , Imperial College London at Harefield Hospital , Harefield , UK
| | - Ewa M Slominska
- a Department of Biochemistry , Medical University of Gdansk , Gdansk , Poland
| | - Magdi H Yacoub
- b Heart Science Centre , Imperial College London at Harefield Hospital , Harefield , UK
| | - Ryszard T Smolenski
- a Department of Biochemistry , Medical University of Gdansk , Gdansk , Poland
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22
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Salhiyyah K, Sarathchandra P, Latif N, Yacoub MH, Chester AH. Hypoxia-mediated regulation of the secretory properties of mitral valve interstitial cells. Am J Physiol Heart Circ Physiol 2017; 313:H14-H23. [PMID: 28314761 DOI: 10.1152/ajpheart.00720.2016] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/31/2016] [Revised: 03/14/2017] [Accepted: 03/14/2017] [Indexed: 11/22/2022]
Abstract
The sophisticated function of the mitral valve depends to a large extent on its extracellular matrix (ECM) and specific cellular components. These are tightly regulated by a repertoire of mechanical stimuli and biological pathways. One potentially important stimulus is hypoxia. The purpose of this investigation is to determine the effect of hypoxia on the regulation of mitral valve interstitial cells (MVICs) with respect to the synthesis and secretion of extracellular matrix proteins. Hypoxia resulted in reduced production of total collagen and sulfated glycosaminoglycans (sGAG) in cultured porcine MVICs. Increased gene expression of matrix metalloproteinases-1 and -9 and their tissue inhibitors 1 and 2 was also observed after incubation under hypoxic conditions for up to 24 h. Hypoxia had no effect on MVIC viability, morphology, or phenotype. MVICs expressed hypoxia-inducible factor (HIF)-1α under hypoxia. Stimulating HIF-1α chemically caused a reduction in the amount of sGAG produced, similar to the effect observed under hypoxia. Human rheumatic valves had greater expression of HIF-1α compared with normal or myxomatous degenerated valves. In conclusion, hypoxia affects the production of certain ECM proteins and expression of matrix remodeling enzymes by MVICs. The effects of hypoxia appear to correlate with the induction of HIF-1α. This study highlights a potential role of hypoxia and HIF-1α in regulating the mitral valve, which could be important in health and disease.NEW & NOTEWORTHY This study demonstrates that hypoxia regulates extracellular matrix secretion and the remodeling potential of heart valve interstitial cells. Expression of hypoxia-induced factor-1α plays a role in these effects. These data highlight the potential role of hypoxia as a physiological mediator of the complex function of heart valve cells.
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Affiliation(s)
- Kareem Salhiyyah
- National Heart & Lung Institute, Imperial College London, Heart Science Centre, Harefield, Middlesex, United Kingdom
| | - Padmini Sarathchandra
- National Heart & Lung Institute, Imperial College London, Heart Science Centre, Harefield, Middlesex, United Kingdom
| | - Najma Latif
- National Heart & Lung Institute, Imperial College London, Heart Science Centre, Harefield, Middlesex, United Kingdom
| | - Magdi H Yacoub
- National Heart & Lung Institute, Imperial College London, Heart Science Centre, Harefield, Middlesex, United Kingdom
| | - Adrian H Chester
- National Heart & Lung Institute, Imperial College London, Heart Science Centre, Harefield, Middlesex, United Kingdom
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23
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Mongkoldhumrongkul N, Latif N, Yacoub MH, Chester AH. Effect of Side-Specific Valvular Shear Stress on the Content of Extracellular Matrix in Aortic Valves. Cardiovasc Eng Technol 2016; 9:151-157. [PMID: 27709350 PMCID: PMC5988791 DOI: 10.1007/s13239-016-0280-z] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/28/2016] [Accepted: 09/17/2016] [Indexed: 11/28/2022]
Abstract
Responses of valve endothelial cells (VECs) to shear stresses are important for the regulation of valve durability. However, the effect of flow patterns subjected to VECs on the opposite surfaces of the valves on the production of extracellular matrix (ECM) has not yet been investigated. This study aims to investigate the response of side-specific flow patterns, in terms of ECM synthesis and/or degradation in porcine aortic valves. Aortic and ventricular sides of aortic valve leaflets were exposed to oscillatory and laminar flow generated by a Cone-and-Plate machine for 48 h. The amount of collagen, GAGs and elastin was quantified and compared to samples collected from the same leaflets without exposing to flow. The results demonstrated that flow is important to maintain the amount of GAGs and elastin in the valve, as compared to the effect of static conditions. Particularly, the laminar waveform plays a crucial role on the modulation of elastin in side-independent manner. Furthermore, the ability of oscillatory flow on the aortic surface to increase the amount of collagen and GAGs cannot be replicated by exposure of an identical flow pattern on the ventricular side of the valve. Side-specific responses to the particular patterns of flow are important to the regulation of ECM components. Such understanding is imperative to the creation of tissue-engineered heart valves that must be created from the “appropriate” cells that can replicate the functions of the native VECs to regulate the different constituents of ECM.
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Affiliation(s)
| | - Najma Latif
- Imperial College, NHLI, Heart Science Centre, Harefield, Middlesex, UB9 6JH, UK
| | - Magdi H Yacoub
- Imperial College, NHLI, Heart Science Centre, Harefield, Middlesex, UB9 6JH, UK
| | - Adrian H Chester
- Imperial College, NHLI, Heart Science Centre, Harefield, Middlesex, UB9 6JH, UK.
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24
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Mohamed NA, Ahmetaj-Shala B, Duluc L, Mackenzie LS, Kirkby NS, Reed DM, Lickiss PD, Davies RP, Freeman GR, Wojciak-Stothard B, Chester AH, El-Sherbiny IM, Mitchell JA, Yacoub MH. A New NO-Releasing Nanoformulation for the Treatment of Pulmonary Arterial Hypertension. J Cardiovasc Transl Res 2016; 9:162-4. [PMID: 26960567 PMCID: PMC4830862 DOI: 10.1007/s12265-016-9684-2] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/10/2016] [Accepted: 02/17/2016] [Indexed: 01/25/2023]
Abstract
Pulmonary arterial hypertension (PAH) is a chronic and progressive disease which continues to carry an unacceptably high mortality and morbidity. The nitric oxide (NO) pathway has been implicated in the pathophysiology and progression of the disease. Its extremely short half-life and systemic effects have hampered the clinical use of NO in PAH. In an attempt to circumvent these major limitations, we have developed a new NO-nanomedicine formulation. The formulation was based on hydrogel-like polymeric composite NO-releasing nanoparticles (NO-RP). The kinetics of NO release from the NO-RP showed a peak at about 120 min followed by a sustained release for over 8 h. The NO-RP did not affect the viability or inflammation responses of endothelial cells. The NO-RP produced concentration-dependent relaxations of pulmonary arteries in mice with PAH induced by hypoxia. In conclusion, NO-RP drugs could considerably enhance the therapeutic potential of NO therapy for PAH.
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Affiliation(s)
- Nura A Mohamed
- Department of Cardiothoracic Pharmacology, National Heart and Lung Institute, Imperial College, Dovehouse Street, London, SW3 6LY, UK
- Heart Science Centre, Imperial College, Harefield, Uxbridge, UB9 6JH, UK
- Qatar Foundation Research and Development Division, Doha, Qatar
| | - Blerina Ahmetaj-Shala
- Department of Cardiothoracic Pharmacology, National Heart and Lung Institute, Imperial College, Dovehouse Street, London, SW3 6LY, UK
| | - Lucie Duluc
- Department of Experimental Medicine and Toxicology, Hammersmith Campus, Imperial College London, Du Cane Road, London, W12 0NN, UK
| | - Louise S Mackenzie
- School of Life and Medical Sciences, University of Hertfordshire, Hatfield, AL10 9AB, UK
| | - Nicholas S Kirkby
- Department of Cardiothoracic Pharmacology, National Heart and Lung Institute, Imperial College, Dovehouse Street, London, SW3 6LY, UK
| | - Daniel M Reed
- Department of Cardiothoracic Pharmacology, National Heart and Lung Institute, Imperial College, Dovehouse Street, London, SW3 6LY, UK
| | - Paul D Lickiss
- Synthesis Section, Department of Chemistry, Imperial College London, South Kensington, London, SW7 2AZ, UK
| | - Robert P Davies
- Synthesis Section, Department of Chemistry, Imperial College London, South Kensington, London, SW7 2AZ, UK
| | - Gemma R Freeman
- Synthesis Section, Department of Chemistry, Imperial College London, South Kensington, London, SW7 2AZ, UK
| | - Beata Wojciak-Stothard
- Department of Experimental Medicine and Toxicology, Hammersmith Campus, Imperial College London, Du Cane Road, London, W12 0NN, UK
| | - Adrian H Chester
- Heart Science Centre, Imperial College, Harefield, Uxbridge, UB9 6JH, UK
| | - Ibrahim M El-Sherbiny
- Center for Materials Science, Zewail City, Sheikh, Zayed District, 12588, 6th of October City, Giza, Egypt
| | - Jane A Mitchell
- Department of Cardiothoracic Pharmacology, National Heart and Lung Institute, Imperial College, Dovehouse Street, London, SW3 6LY, UK
| | - Magdi H Yacoub
- Heart Science Centre, Imperial College, Harefield, Uxbridge, UB9 6JH, UK.
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25
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Mongkoldhumrongkul N, H. Yacoub M, H. Chester A. Valve Endothelial Cells - Not Just Any Old Endothelial Cells. Curr Vasc Pharmacol 2016; 14:146-54. [DOI: 10.2174/1570161114666151202205504] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2015] [Revised: 10/07/2015] [Accepted: 10/07/2015] [Indexed: 11/22/2022]
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26
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Kutryb-Zajac B, Yuen AHY, Khalpey Z, Zukowska P, Slominska EM, Taylor PM, Goldstein S, Heacox AE, Lavitrano M, Chester AH, Yacoub MH, Smolenski RT. Nucleotide Catabolism on the Surface of Aortic Valve Xenografts; Effects of Different Decellularization Strategies. J Cardiovasc Transl Res 2016; 9:119-26. [PMID: 26832118 PMCID: PMC4830859 DOI: 10.1007/s12265-016-9672-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/28/2015] [Accepted: 01/04/2016] [Indexed: 02/07/2023]
Abstract
Extracellular nucleotide metabolism controls thrombosis and inflammation and may affect degeneration and calcification of aortic valve prostheses. We evaluated the effect of different decellularization strategies on enzyme activities involved in extracellular nucleotide metabolism. Porcine valves were tested intact or decellularized either by detergent treatment or hypotonic lysis and nuclease digestion. The rates of ATP hydrolysis, AMP hydrolysis, and adenosine deamination were estimated by incubation of aorta or valve leaflet sections with substrates followed by HPLC analysis. We demonstrated relatively high activities of ecto-enzymes on porcine valve as compared to the aortic wall. Hypotonic lysis/nuclease digestion preserved >80 % of ATP and AMP hydrolytic activity but reduced adenosine deamination to <10 %. Detergent decellularization completely removed (<5 %) all these activities. These results demonstrate high intensity of extracellular nucleotide metabolism on valve surface and indicate that various valve decellularization techniques differently affect ecto-enzyme activities that could be important in the development of improved valve prostheses.
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Affiliation(s)
| | - Ada H Y Yuen
- Heart Science Centre, Imperial College London, London, UK
| | | | - Paulina Zukowska
- Department of Biochemistry, Medical University of Gdansk, Gdańsk, Poland
| | - Ewa M Slominska
- Department of Biochemistry, Medical University of Gdansk, Gdańsk, Poland
| | | | | | | | | | | | - Magdi H Yacoub
- Heart Science Centre, Imperial College London, London, UK
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27
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Levine RA, Hagége AA, Judge DP, Padala M, Dal-Bianco JP, Aikawa E, Beaudoin J, Bischoff J, Bouatia-Naji N, Bruneval P, Butcher JT, Carpentier A, Chaput M, Chester AH, Clusel C, Delling FN, Dietz HC, Dina C, Durst R, Fernandez-Friera L, Handschumacher MD, Jensen MO, Jeunemaitre XP, Le Marec H, Le Tourneau T, Markwald RR, Mérot J, Messas E, Milan DP, Neri T, Norris RA, Peal D, Perrocheau M, Probst V, Pucéat M, Rosenthal N, Solis J, Schott JJ, Schwammenthal E, Slaugenhaupt SA, Song JK, Yacoub MH. Mitral valve disease--morphology and mechanisms. Nat Rev Cardiol 2015; 12:689-710. [PMID: 26483167 DOI: 10.1038/nrcardio.2015.161] [Citation(s) in RCA: 222] [Impact Index Per Article: 24.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Mitral valve disease is a frequent cause of heart failure and death. Emerging evidence indicates that the mitral valve is not a passive structure, but--even in adult life--remains dynamic and accessible for treatment. This concept motivates efforts to reduce the clinical progression of mitral valve disease through early detection and modification of underlying mechanisms. Discoveries of genetic mutations causing mitral valve elongation and prolapse have revealed that growth factor signalling and cell migration pathways are regulated by structural molecules in ways that can be modified to limit progression from developmental defects to valve degeneration with clinical complications. Mitral valve enlargement can determine left ventricular outflow tract obstruction in hypertrophic cardiomyopathy, and might be stimulated by potentially modifiable biological valvular-ventricular interactions. Mitral valve plasticity also allows adaptive growth in response to ventricular remodelling. However, adverse cellular and mechanobiological processes create relative leaflet deficiency in the ischaemic setting, leading to mitral regurgitation with increased heart failure and mortality. Our approach, which bridges clinicians and basic scientists, enables the correlation of observed disease with cellular and molecular mechanisms, leading to the discovery of new opportunities for improving the natural history of mitral valve disease.
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Affiliation(s)
- Robert A Levine
- Cardiac Ultrasound Laboratory, Massachusetts General Hospital, Harvard Medical School, 55 Fruit Street, Yawkey 5E, Boston, MA 02114, USA
| | - Albert A Hagége
- Hôpital Européen Georges Pompidou, Université René Descartes, UMR 970, Paris, France
| | | | | | - Jacob P Dal-Bianco
- Massachusetts General Hospital, Cardiac Ultrasound Laboratory, Harvard Medical School, Boston, MA, USA
| | | | | | | | - Nabila Bouatia-Naji
- Hôpital Européen Georges Pompidou, Université René Descartes, UMR 970, Paris, France
| | - Patrick Bruneval
- Hôpital Européen Georges Pompidou, Université René Descartes, UMR 970, Paris, France
| | | | - Alain Carpentier
- Hôpital Européen Georges Pompidou, Université René Descartes, UMR 970, Paris, France
| | | | | | | | - Francesca N Delling
- Beth Israel Deaconess Medical Centre, Harvard Medical School, Boston, MA, USA
| | | | - Christian Dina
- University of Nantes, Thoracic Institute, INSERM UMR 1097, CNRS UMR 6291, Nantes, France
| | - Ronen Durst
- Hadassah-Hebrew University Medical Centre, Jerusalem, Israel
| | - Leticia Fernandez-Friera
- Hospital Universitario HM Monteprincipe and the Centro Nacional de Investigaciones Cardiovasculares, Carlos III (CNIC), Madrid, Spain
| | - Mark D Handschumacher
- Massachusetts General Hospital, Cardiac Ultrasound Laboratory, Harvard Medical School, Boston, MA, USA
| | | | - Xavier P Jeunemaitre
- Hôpital Européen Georges Pompidou, Université René Descartes, UMR 970, Paris, France
| | - Hervé Le Marec
- University of Nantes, Thoracic Institute, INSERM UMR 1097, CNRS UMR 6291, Nantes, France
| | - Thierry Le Tourneau
- University of Nantes, Thoracic Institute, INSERM UMR 1097, CNRS UMR 6291, Nantes, France
| | | | - Jean Mérot
- University of Nantes, Thoracic Institute, INSERM UMR 1097, CNRS UMR 6291, Nantes, France
| | - Emmanuel Messas
- Hôpital Européen Georges Pompidou, Université René Descartes, UMR 970, Paris, France
| | - David P Milan
- Cardiovascular Research Center, Harvard Medical School, Boston, MA, USA
| | - Tui Neri
- Aix-Marseille University, INSERM UMR 910, Marseille, France
| | | | - David Peal
- Cardiovascular Research Center, Harvard Medical School, Boston, MA, USA
| | - Maelle Perrocheau
- Hôpital Européen Georges Pompidou, Université René Descartes, UMR 970, Paris, France
| | - Vincent Probst
- University of Nantes, Thoracic Institute, INSERM UMR 1097, CNRS UMR 6291, Nantes, France
| | - Michael Pucéat
- Aix-Marseille University, INSERM UMR 910, Marseille, France
| | | | - Jorge Solis
- Hospital Universitario HM Monteprincipe and the Centro Nacional de Investigaciones Cardiovasculares, Carlos III (CNIC), Madrid, Spain
| | - Jean-Jacques Schott
- University of Nantes, Thoracic Institute, INSERM UMR 1097, CNRS UMR 6291, Nantes, France
| | | | - Susan A Slaugenhaupt
- Center for Human Genetic Research, MGH Research Institute, Harvard Medical School, Boston, MA, USA
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28
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Latif N, Quillon A, Sarathchandra P, McCormack A, Lozanoski A, Yacoub MH, Chester AH. Modulation of human valve interstitial cell phenotype and function using a fibroblast growth factor 2 formulation. PLoS One 2015; 10:e0127844. [PMID: 26042674 PMCID: PMC4456368 DOI: 10.1371/journal.pone.0127844] [Citation(s) in RCA: 56] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2015] [Accepted: 04/21/2015] [Indexed: 12/04/2022] Open
Abstract
Valve interstitial cells (VICs) are fibroblastic in nature however in culture it is widely accepted that they differentiate into a myofibroblastic phenotype. This study assessed a fibroblast culture media formulation for its ability to maintain the phenotype and function of VICs as in the intact healthy valve. Normal human VICs were cultured separately in standard DMEM and in fibroblast media consisting of FGF2 (10ng/ml), insulin (50ng/ml) and 2% FCS for at least a week. Cell morphology, aspect ratio, size, levels and distribution of protein expression, proliferation, cell cycle, contraction and migration were assessed. Some VICs and some valve endothelial cells expressed FGF2 in valve tissue and this expression was increased in calcified valves. VICs in DMEM exhibited large, spread cells whereas VICs in fibroblast media were smaller, elongated and spindly. Aspect ratio and size were both significantly higher in DMEM (p<0.01). The level of expression of α-SMA was significantly reduced in fibroblast media at day 2 after isolation (p<0.01) and the expression of α-SMA, SM22 and EDA-fibronectin was significantly reduced in fibroblast media at days 7 and 12 post-isolation (p<0.01). Expression of cytoskeletal proteins, bone marker proteins and extracellular matrix proteins was reduced in fibroblast media. Proliferation of VICs in fibroblast media was significantly reduced at weeks 1 (p<0.05) and 2 (p<0.01). Collagen gel contraction was significantly reduced in fibroblast media (p<0.05). VICs were found to have significantly fewer and smaller focal adhesions in fibroblast media (p<0.01) with significantly fewer supermature focal adhesions in fibroblast media (p<0.001). Ultrastructurally, VICs in fibroblast media resembled native VICs from intact valves. VICs in fibroblast media demonstrated a slower migratory ability after wounding at 72 hours (p<0.01). Treatment of human VICs with this fibroblast media formulation has the ability to maintain and to dedifferentiate the VICs back to a fibroblastic phenotype with phenotypic and functional characteristics ascribed to cells in the intact valve. This methodology is fundamental in the study of normal valve biology, pathology and in the field of tissue engineering.
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Affiliation(s)
- Najma Latif
- Imperial College, Heart Science Centre, Harefield Hospital, Harefield, Middx, UB9 6JH, United Kingdom
- QCRC, Qatar Cardiovascular Research Centre, Qatar Foundation, Doha, Qatar
- * E-mail:
| | - Alfred Quillon
- Département de Biologie, École Normale Supérieure de Lyon, Université de Lyon, UCB Lyon1, 46 Allée d’Italie, Lyon, France
| | - Padmini Sarathchandra
- Imperial College, Heart Science Centre, Harefield Hospital, Harefield, Middx, UB9 6JH, United Kingdom
| | - Ann McCormack
- Imperial College, Heart Science Centre, Harefield Hospital, Harefield, Middx, UB9 6JH, United Kingdom
| | - Alec Lozanoski
- Imperial College, Heart Science Centre, Harefield Hospital, Harefield, Middx, UB9 6JH, United Kingdom
| | - Magdi H. Yacoub
- Imperial College, Heart Science Centre, Harefield Hospital, Harefield, Middx, UB9 6JH, United Kingdom
- QCRC, Qatar Cardiovascular Research Centre, Qatar Foundation, Doha, Qatar
| | - Adrian H. Chester
- Imperial College, Heart Science Centre, Harefield Hospital, Harefield, Middx, UB9 6JH, United Kingdom
- QCRC, Qatar Cardiovascular Research Centre, Qatar Foundation, Doha, Qatar
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29
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Latif N, Sarathchandra P, Chester AH, Yacoub MH. Expression of smooth muscle cell markers and co-activators in calcified aortic valves. Eur Heart J 2015; 36:1335-45. [PMID: 24419809 DOI: 10.1093/eurheartj/eht547] [Citation(s) in RCA: 65] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/21/2013] [Accepted: 10/24/2013] [Indexed: 01/06/2023] Open
Abstract
AIMS Similar risk factors and mediators are involved in calcific aortic stenosis (CAS) and atherosclerosis. Since normal valves harbour a low percentage of smooth muscle cells (SMCs), we hypothesize that the SMC phenotype participates in the pathogenesis of CAS. METHOD AND RESULTS We analysed 12 normal and 22 calcified aortic valves for SMC markers and the expression of co-activators of SMC gene expression, myocardin and myocardin-related transcription factors (MRTF-A/B). Transforming growth factor β (TGFβ1) was used to upregulate SMC markers and co-activators in valve interstitial cells (VICs) and transmission electron microscopy (TEM) was used to detect the presence of SMC in atypical regions of the valve leaflets. Smooth muscle cell markers and co-activators, myocardin, MRTF-A, and MRTF-B, demonstrated an increased incidence and aberrant expression around calcified nodules in all 22 calcified valves as well as in surface and microvessel endothelial cells. Smooth muscle cell markers and MRTF-A were significantly increased in calcified valves. Transforming growth factor β1 (TGFβ1) (10 ng/mL) was able to significantly upregulate the expression of some SMC markers and MRTF-A in VICs. Transmission electron microscopy of the fibrosa layer of calcified valves demonstrated the presence of bundles of SMCs and smooth muscle-derived foam cells. CONCLUSION Smooth muscle cell markers and co-activators, myocardin and MRTFs, were aberrantly expressed in calcified valves. Transforming growth factor β1 was able to significantly upregulate SMC markers and MRTF-A in VICs. Transmission electron microscopy unequivocally identified the presence of SMCs in calcified regions of valve leaflets. These findings provide evidence that the SMC phenotype plays a role in the development of CAS.
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Affiliation(s)
- Najma Latif
- Heart Science Centre, Imperial College, Harefield Hospital, Harefield, Middlesex UB9 6JH, UK QCRC, Qatar Cardiovascular Research Centre, Qatar Foundation, Qatar
| | - Padmini Sarathchandra
- Heart Science Centre, Imperial College, Harefield Hospital, Harefield, Middlesex UB9 6JH, UK QCRC, Qatar Cardiovascular Research Centre, Qatar Foundation, Qatar
| | - Adrian H Chester
- Heart Science Centre, Imperial College, Harefield Hospital, Harefield, Middlesex UB9 6JH, UK QCRC, Qatar Cardiovascular Research Centre, Qatar Foundation, Qatar
| | - Magdi H Yacoub
- Heart Science Centre, Imperial College, Harefield Hospital, Harefield, Middlesex UB9 6JH, UK QCRC, Qatar Cardiovascular Research Centre, Qatar Foundation, Qatar
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Kaniewska E, Sielicka A, Sarathchandra P, Pelikant-Małecka I, Olkowicz M, Słomińska EM, Chester AH, Yacoub MH, Smoleński RT. Immunohistochemical and functional analysis of ectonucleoside triphosphate diphosphohydrolase 1 (CD39) and ecto-5'-nucleotidase (CD73) in pig aortic valves. Nucleosides Nucleotides Nucleic Acids 2015; 33:305-12. [PMID: 24940684 DOI: 10.1080/15257770.2014.885985] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
Extracellular nucleotides control mechanisms such as thrombosis or inflammation that are important in several pathologies, including heart valve disease and calcification. Ectonucleoside triphosphate diphosphohydrolase 1 (eNTPD1, CD39) and ecto-5'-nucleotidase (e5NT, CD73) are ectoenzymes that convert adenosine triphosphate to adenosine diphosphate, adenosine monophosphate and finally to adenosine. Changes in activities of these enzymes influence extracellular nucleotide concentrations and therefore could be involved in valve pathology. This study aimed to analyze type of cells, specific area, level of expression and biochemical function of CD39 and CD73 in pig aortic valves. Samples were collected from aortic valves of domestic pigs. Histological sections were cut from paraffin embedded tissue blocks. Following incubation with primary antibody against CD39 or CD73, washing and secondary goat anti-rabbit secondary antibodies, slides were viewed with NanoZoomer scanner. Substantial expression CD39 and CD73 was observed in two main types of valve cells: endothelial and valve interstitial cells. Subsequently, biochemical function of CD39 and CD73 was evaluated in cells cultured from pig aortic valve. Breakdown of extracellular nucleotides added to cell medium was analyzed with high performance liquid chromatography. In the interstitial cells, the CD73 products formation was much faster than in endothelium, while for the CD39 activity this relation was opposite. Expression and high concentration of CD39 and CD73 products in endothelium are expected, but presence of CD73 in valve interstitial cells is a surprise. We conclude that CD39 and CD73 and their enzymatic activities that convert extracellular nucleotides are highly expressed and could have special function in the valve.
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Affiliation(s)
- Ewa Kaniewska
- a Department of Biochemistry , Medical University of Gdansk , Gdansk , Poland
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31
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Affiliation(s)
- Sergio Bertazzo
- Department of Materials, Department of Bioengineering, Imperial College London, UK.
| | - Joseph A M Steele
- Institute of Biomedical Engineering, Department of Bioengineering, Imperial College London, UK
| | - Adrian H Chester
- National Heart & Lung Institute, Harefield Heart Science Centre, Department of Bioengineering, Imperial College London, UK
| | - Magdi H Yacoub
- National Heart & Lung Institute, Harefield Heart Science Centre, Department of Bioengineering, Imperial College London, UK
| | - Molly M Stevens
- Department of Materials, Department of Bioengineering, Imperial College London, UK; Institute of Biomedical Engineering, Department of Bioengineering, Imperial College London, UK.
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Colazzo F, Alrashed F, Saratchandra P, Carubelli I, Chester AH, Yacoub MH, Taylor PM, Somers P. Shear stress and VEGF enhance endothelial differentiation of human adipose-derived stem cells. Growth Factors 2014; 32:139-49. [PMID: 25112491 DOI: 10.3109/08977194.2014.945642] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Herein we combine chemical and mechanical stimulation to investigate the effects of vascular endothelial growth factor (VEGF) and physiological shear stress in promoting the differentiation human adipose derived stem cells (ADSCs) into endothelial cells. ADSCs were isolated and characterized; endothelial differentiation was promoted by culturing confluent cells in 50 ng/ml VEGF under physiological shear stress for up to 14 days. Afterwards, endothelial cells were seeded onto collagen or acellular aortic valve matrices and exposed to four culture conditions: shear stress + VEGF; shear stress - VEGF; static + VEGF and static - VEGF. After 7 days, phenotype was investigated. ADSCs subjected to shear stress and VEGF express a comprehensive range of specific endothelial markers (vWF, eNOS and FLT-1 after 7 days and CD31, FLk-1 and VE-cadherin after 14 days) and maintain the phenotype when seeded onto scaffolds. Our protocol proved to be an efficient source of endothelial-like cells for tissue engineering based on autologous ADSC.
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Affiliation(s)
- Francesca Colazzo
- Heart Science Centre, NHLI, Imperial College London , Harefield, Middlesex , UK and
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33
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Miragoli M, Yacoub MH, El-Hamamsy I, Sanchez-Alonso JL, Moshkov A, Mongkoldhumrongkul N, Padala M, Paramagurunathan S, Sarathchandra P, Korchev YE, Gorelik J, Chester AH. Side-specific mechanical properties of valve endothelial cells. Am J Physiol Heart Circ Physiol 2014; 307:H15-24. [DOI: 10.1152/ajpheart.00228.2013] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Aortic valve endothelial cells (ECs) function in vastly different levels of shear stress. The biomechanical characteristics of cells on each side of valve have not been investigated. We assessed the morphology and mechanical properties of cultured or native valve ECs on intact porcine aortic valve cusps using a scanning ion conductance microscope (SICM). The autocrine influence of several endothelial-derived mediators on cell compliance and the expression of actin were also examined. Cells on the aortic side of the valve are characterized by a more elongated shape and were aligned along a single axis. Measurement of EC membrane compliance using the SICM showed that the cells on the aortic side of intact valves were significantly softer than those on the ventricular side. A similar pattern was seen in cultured cells. Addition of 10−6 M of the nitric oxide donor sodium nitroprusside caused a significant reduction in the compliance of ventricular ECs but had no effect on cells on the aortic side of the valve. Conversely, endothelin-1 (10−10-10−8 M) caused an increase in the compliance of aortic cells but had no effect on cells on the ventricular side of the valve. Aortic side EC compliance was also increased by 10−4 M of the nitric oxide synthase inhibitor NG-nitro-l-arginine methyl ester. Immunofluorescent staining of actin filaments revealed a great density of staining in ECs on the ventricular surface. The expression of actin and the relative membrane compliance of ECs on both side of the valve were not affected by ventricular and aortic patterns of flow. This study has shown side-specific differences in the biomechanics of aortic valve ECs. These differences can have important implications for valve function.
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Affiliation(s)
- Michele Miragoli
- Imperial College, National Heart and Lung Institute, Department of Cardiac Medicine, Imperial Centre for Translational and Experimental Medicine, Hammersmith Campus, London, United Kingdom
- Humanitas Clinical and Research Center, Rozzano (Milan), Italy
| | - Magdi H. Yacoub
- Imperial College, National Heart and Lung Institute, Heart Science Centre, Harefield, Middlesex, United Kingdom
- Qatar Cardiovascular Research Centre, Qatar Foundation, Doha, Qatar
| | - Ismail El-Hamamsy
- Imperial College, National Heart and Lung Institute, Heart Science Centre, Harefield, Middlesex, United Kingdom
| | - Jose L. Sanchez-Alonso
- Imperial College, National Heart and Lung Institute, Department of Cardiac Medicine, Imperial Centre for Translational and Experimental Medicine, Hammersmith Campus, London, United Kingdom
| | - Alexey Moshkov
- Imperial College, National Heart and Lung Institute, Department of Cardiac Medicine, Imperial Centre for Translational and Experimental Medicine, Hammersmith Campus, London, United Kingdom
| | | | - Muralindar Padala
- Department of Surgery, Emory University School of Medicine, Atlanta, Georgia; and
| | - Saravanan Paramagurunathan
- Imperial College, National Heart and Lung Institute, Heart Science Centre, Harefield, Middlesex, United Kingdom
| | - Padmini Sarathchandra
- Imperial College, National Heart and Lung Institute, Heart Science Centre, Harefield, Middlesex, United Kingdom
| | - Yuri E. Korchev
- Division of Medicine, Imperial College, Hammersmith Campus, London, United Kingdom
| | - Julia Gorelik
- Imperial College, National Heart and Lung Institute, Department of Cardiac Medicine, Imperial Centre for Translational and Experimental Medicine, Hammersmith Campus, London, United Kingdom
| | - Adrian H. Chester
- Imperial College, National Heart and Lung Institute, Heart Science Centre, Harefield, Middlesex, United Kingdom
- Qatar Cardiovascular Research Centre, Qatar Foundation, Doha, Qatar
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Abstract
Pulmonary arterial hypertension (PAH) is a rare but debilitating disease, which if left untreated rapidly progresses to right ventricular failure and eventually death. In the quest to understand the pathogenesis of this disease differences in the profile, expression and action of vasoactive substances released by the endothelium have been identified in patients with PAH. Of these, endothelin-1 (ET-1) is of particular interest since it is known to be an extremely powerful vasoconstrictor and also involved in vascular remodelling. Identification of ET-1 as a target for pharmacological intervention has lead to the discovery of a number of compounds that can block the receptors via which ET-1 mediates its effects. This review sets out the evidence in support of a role for ET-1 in the onset and progression of the disease and reviews the data from the various clinical trials of ET-1 receptor antagonists for the treatment of PAH.
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Affiliation(s)
- Adrian H Chester
- Heart Science Centre, NHLI, Imperial College London, Harefield, Middlesex, UK UB9 6JH
| | - Magdi H Yacoub
- Qatar Cardiovascular Research Centre, Qatar Foundation, Qatar
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Chester AH, El-Hamamsy I, Butcher JT, Latif N, Bertazzo S, Yacoub MH. The living aortic valve: From molecules to function. Glob Cardiol Sci Pract 2014; 2014:52-77. [PMID: 25054122 PMCID: PMC4104380 DOI: 10.5339/gcsp.2014.11] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2014] [Accepted: 04/28/2014] [Indexed: 12/12/2022] Open
Abstract
The aortic valve lies in a unique hemodynamic environment, one characterized by a range of stresses (shear stress, bending forces, loading forces and strain) that vary in intensity and direction throughout the cardiac cycle. Yet, despite its changing environment, the aortic valve opens and closes over 100,000 times a day and, in the majority of human beings, will function normally over a lifespan of 70–90 years. Until relatively recently heart valves were considered passive structures that play no active role in the functioning of a valve, or in the maintenance of its integrity and durability. However, through clinical experience and basic research the aortic valve can now be characterized as a living, dynamic organ with the capacity to adapt to its complex mechanical and biomechanical environment through active and passive communication between its constituent parts. The clinical relevance of a living valve substitute in patients requiring aortic valve replacement has been confirmed. This highlights the importance of using tissue engineering to develop heart valve substitutes containing living cells which have the ability to assume the complex functioning of the native valve.
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Sohier J, Carubelli I, Sarathchandra P, Latif N, Chester AH, Yacoub MH. The potential of anisotropic matrices as substrate for heart valve engineering. Biomaterials 2013; 35:1833-44. [PMID: 24314554 DOI: 10.1016/j.biomaterials.2013.10.061] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2013] [Accepted: 10/20/2013] [Indexed: 11/19/2022]
Abstract
Cells environment is increasingly recognized as an important function regulator through cell-matrix interactions. Extracellular matrix (ECM) anisotropy being a key component of heart valves properties, we have devised a method to create highly porous anisotropic nanofibrillar scaffolds and studied their suitability as cell-support and interactions with human adipose derived stem cells (hADSCs) and human valve interstitial cells (hVICs). Anisotropic nanofibrillar scaffolds were produced by a modified jet-spraying method that allows the formation of aligned nanofibres (600 nm) through air-stream diffraction of a polymer solution (poly (ε-caprolactone, PCL) and collection onto a variably rotating drum. The resulting matrices of high porosity (99%) mimicked valve mechanical anisotropy. Dynamically seeded hADSC and hVIC cultured on scaffolds up to 20 days revealed that hADSC and hVIC penetration within the matrices was improved by anisotropic organization. Within 10 days, cells populated the entire scaffolds thickness and produced ECM (collagen I, III and elastin). As a result, mechanical properties of the constructs were improved over culture, while remaining anisotropic. In contrast to isotropic matrices, anisotropy induced elongated hADSCs and hVICs morphology that followed nanofibres orientation. Interestingly, these morphological changes did not induce hADSC differentiation towards the mesoderm lineages while hVIC recovered a physiological phenotype over culture in the biomimetic matrices. Overall, this study indicates that highly porous anisotropic jet-sprayed matrices are interesting candidates for valve tissue engineering, through anisotropic mechanical properties, efficient cell population, conservation of stem cells phenotype and recovery of hVIC physiological phenotype.
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Affiliation(s)
- Jérôme Sohier
- Magdi Yacoub Institute, Harefield Heart Science Centre, Imperial College London, Hill End Road, Harefield UB9 6JH, United Kingdom; Qatar Cardiovascular Research Center, Qatar Foundation, Qatar Science and Technology Park, PO Box 5825, Doha, Qatar
| | - Ivan Carubelli
- Magdi Yacoub Institute, Harefield Heart Science Centre, Imperial College London, Hill End Road, Harefield UB9 6JH, United Kingdom
| | - Padmini Sarathchandra
- Magdi Yacoub Institute, Harefield Heart Science Centre, Imperial College London, Hill End Road, Harefield UB9 6JH, United Kingdom
| | - Najma Latif
- Magdi Yacoub Institute, Harefield Heart Science Centre, Imperial College London, Hill End Road, Harefield UB9 6JH, United Kingdom
| | - Adrian H Chester
- Magdi Yacoub Institute, Harefield Heart Science Centre, Imperial College London, Hill End Road, Harefield UB9 6JH, United Kingdom; Qatar Cardiovascular Research Center, Qatar Foundation, Qatar Science and Technology Park, PO Box 5825, Doha, Qatar
| | - Magdi H Yacoub
- Magdi Yacoub Institute, Harefield Heart Science Centre, Imperial College London, Hill End Road, Harefield UB9 6JH, United Kingdom; Qatar Cardiovascular Research Center, Qatar Foundation, Qatar Science and Technology Park, PO Box 5825, Doha, Qatar.
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Bertazzo S, Gentleman E, Cloyd KL, Chester AH, Yacoub MH, Stevens MM. Nano-analytical electron microscopy reveals fundamental insights into human cardiovascular tissue calcification. Nat Mater 2013; 12:576-83. [PMID: 23603848 PMCID: PMC5833942 DOI: 10.1038/nmat3627] [Citation(s) in RCA: 191] [Impact Index Per Article: 17.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/30/2012] [Accepted: 03/11/2013] [Indexed: 05/16/2023]
Abstract
The accumulation of calcified material in cardiovascular tissue is thought to involve cytochemical, extracellular matrix and systemic signals; however, its precise composition and nanoscale architecture remain largely unexplored. Using nano-analytical electron microscopy techniques, we examined valves, aortae and coronary arteries from patients with and without calcific cardiovascular disease and detected spherical calcium phosphate particles, regardless of the presence of calcific lesions. We also examined lesions after sectioning with a focused ion beam and found that the spherical particles are composed of highly crystalline hydroxyapatite that crystallographically and structurally differs from bone mineral. Taken together, these data suggest that mineralized spherical particles may play a fundamental role in calcific lesion formation. Their ubiquitous presence in varied cardiovascular tissues and from patients with a spectrum of diseases further suggests that lesion formation may follow a common process. Indeed, applying materials science techniques to ectopic and orthotopic calcification has great potential to lend critical insights into pathophysiological processes underlying calcific cardiovascular disease.
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Affiliation(s)
- Sergio Bertazzo
- Department of Materials, Imperial College London, London, UK
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Borghi A, New SEP, Chester AH, Taylor PM, Yacoub MH. Time-dependent mechanical properties of aortic valve cusps: effect of glycosaminoglycan depletion. Acta Biomater 2013; 9:4645-52. [PMID: 22963848 DOI: 10.1016/j.actbio.2012.09.001] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2012] [Revised: 07/30/2012] [Accepted: 09/01/2012] [Indexed: 11/19/2022]
Abstract
Aortic valve (AV) performance is closely linked to its structural components. Glycosaminoglycans (GAGs) are thought to influence the time-dependent properties of living tissues. This study investigates the effect of GAGs on the viscoelastic behaviour of the AV. Fresh porcine AV cusps were either treated enzymatically to remove GAGs or left untreated (control). The specimens were tested for stress relaxation and tensile properties under equibiaxial load conditions. The stress relaxation curves were fitted using a double exponential decay equation and the early relaxation constant (τ(1)) and late relaxation constant (τ(2)) calculated for each specimen. Immunohistochemistry confirmed the successful depletion of both sulphated and non-sulphated GAGs from the AV cusps. A statistical increase in τ(1) was found for both the radial and circumferential directions between the control and -GAGs group (radial, control 17.37s vs. -GAGs 25.65 s; circumferential, control 21.47s vs. -GAGs 27.37 s). It was also found that τ(1) differed between the two directions for the control group but not after GAG depletion (control, radial 17.37s vs. circumferential 21.47 s; -GAGs, radial 25.65 s vs. circumferential 27.37s). No effect on stiffness was found. The results showed that the presence of GAGs influences the mechanical viscoelastic properties of the AV but has no effect on the stiffness. The natural anisotropy, which reflects the relaxation kinematics, is lost after GAG depletion.
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Affiliation(s)
- Alessandro Borghi
- Institute of Biomedical Engineering, Imperial College London, South Kensington, London, UK
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Cloyd KL, El-Hamamsy I, Boonrungsiman S, Hedegaard M, Gentleman E, Sarathchandra P, Colazzo F, Gentleman MM, Yacoub MH, Chester AH, Stevens MM. Characterization of porcine aortic valvular interstitial cell 'calcified' nodules. PLoS One 2012; 7:e48154. [PMID: 23110195 PMCID: PMC3482191 DOI: 10.1371/journal.pone.0048154] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2012] [Accepted: 09/20/2012] [Indexed: 11/19/2022] Open
Abstract
Valve interstitial cells populate aortic valve cusps and have been implicated in aortic valve calcification. Here we investigate a common in vitro model for aortic valve calcification by characterizing nodule formation in porcine aortic valve interstitial cells (PAVICs) cultured in osteogenic (OST) medium supplemented with transforming growth factor beta 1 (TGF-β1). Using a combination of materials science and biological techniques, we investigate the relevance of PAVICs nodules in modeling the mineralised material produced in calcified aortic valve disease. PAVICs were grown in OST medium supplemented with TGF-β1 (OST+TGF-β1) or basal (CTL) medium for up to 21 days. Murine calvarial osteoblasts (MOBs) were grown in OST medium for 28 days as a known mineralizing model for comparison. PAVICs grown in OST+TGF-β1 produced nodular structures staining positive for calcium content; however, micro-Raman spectroscopy allowed live, noninvasive imaging that showed an absence of mineralized material, which was readily identified in nodules formed by MOBs and has been identified in human valves. Gene expression analysis, immunostaining, and transmission electron microscopy imaging revealed that PAVICs grown in OST+TGF-β1 medium produced abundant extracellular matrix via the upregulation of the gene for Type I Collagen. PAVICs, nevertheless, did not appear to further transdifferentiate to osteoblasts. Our results demonstrate that 'calcified' nodules formed from PAVICs grown in OST+TGF-β1 medium do not mineralize after 21 days in culture, but rather they express a myofibroblast-like phenotype and produce a collagen-rich extracellular matrix. This study clarifies further the role of PAVICs as a model of calcification of the human aortic valve.
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Affiliation(s)
- Kristy L. Cloyd
- Department of Materials, Imperial College London, London, United Kingdom
- Institute of Biomedical Engineering, Imperial College London, London, United Kingdom
- Department of Bioengineering, Imperial College London, London, United Kingdom
| | - Ismail El-Hamamsy
- Division of Cardiac Surgery, Montreal Heart Institute, Montreal, Canada
| | - Suwimon Boonrungsiman
- Department of Materials, Imperial College London, London, United Kingdom
- Institute of Biomedical Engineering, Imperial College London, London, United Kingdom
- Department of Bioengineering, Imperial College London, London, United Kingdom
| | - Martin Hedegaard
- Department of Materials, Imperial College London, London, United Kingdom
- Institute of Biomedical Engineering, Imperial College London, London, United Kingdom
- Department of Bioengineering, Imperial College London, London, United Kingdom
| | - Eileen Gentleman
- Department of Materials, Imperial College London, London, United Kingdom
- Institute of Biomedical Engineering, Imperial College London, London, United Kingdom
- Department of Bioengineering, Imperial College London, London, United Kingdom
| | - Padmini Sarathchandra
- Harefield Heart Science Centre, Imperial College London, Harefield, Middlesex, United Kingdom
| | - Francesca Colazzo
- Harefield Heart Science Centre, Imperial College London, Harefield, Middlesex, United Kingdom
| | - Molly M. Gentleman
- Department of Mechanical Engineering, Texas A&M University, College Station, Texas, United States of America
| | - Magdi H. Yacoub
- Harefield Heart Science Centre, Imperial College London, Harefield, Middlesex, United Kingdom
| | - Adrian H. Chester
- Harefield Heart Science Centre, Imperial College London, Harefield, Middlesex, United Kingdom
| | - Molly M. Stevens
- Department of Materials, Imperial College London, London, United Kingdom
- Institute of Biomedical Engineering, Imperial College London, London, United Kingdom
- Department of Bioengineering, Imperial College London, London, United Kingdom
- * E-mail:
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de Vlaming A, Sauls K, Hajdu Z, Visconti RP, Mehesz AN, Levine RA, Slaugenhaupt SA, Hagège A, Chester AH, Markwald RR, Norris RA. Atrioventricular valve development: new perspectives on an old theme. Differentiation 2012; 84:103-16. [PMID: 22579502 DOI: 10.1016/j.diff.2012.04.001] [Citation(s) in RCA: 75] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2011] [Revised: 03/26/2012] [Accepted: 04/01/2012] [Indexed: 11/19/2022]
Abstract
Atrioventricular valve development commences with an EMT event whereby endocardial cells transform into mesenchyme. The molecular events that induce this phenotypic change are well understood and include many growth factors, signaling components, and transcription factors. Besides their clear importance in valve development, the role of these transformed mesenchyme and the function they serve in the developing prevalve leaflets is less understood. Indeed, we know that these cells migrate, but how and why do they migrate? We also know that they undergo a transition to a mature, committed cell, largely defined as an interstitial fibroblast due to their ability to secrete various matrix components including collagen type I. However, we have yet to uncover mechanisms by which the matrix is synthesized, how it is secreted, and how it is organized. As valve disease is largely characterized by altered cell number, cell activation, and matrix disorganization, answering questions of how the valves are built will likely provide us with information of real clinical relevance. Although expression profiling and descriptive or correlative analyses are insightful, to advance the field, we must now move past the simplicity of these assays and ask fundamental, mechanistic based questions aimed at understanding how valves are "built". Herein we review current understandings of atrioventricular valve development and present what is known and what isn't known. In most cases, basic, biological questions and hypotheses that were presented decades ago on valve development still are yet to be answered but likely hold keys to uncovering new discoveries with relevance to both embryonic development and the developmental basis of adult heart valve diseases. Thus, the goal of this review is to remind us of these questions and provide new perspectives on an old theme of valve development.
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Affiliation(s)
- Annemarieke de Vlaming
- Department of Regenerative Medicine and Cell Biology, School of Medicine, Cardiovascular Developmental Biology Center, Children's Research Institute, Medical University of South Carolina, Charleston, SC 29425, USA
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41
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Lewinsohn AD, Anssari-Benham A, Lee DA, Taylor PM, Chester AH, Yacoub MH, Screen HRC. Anisotropic strain transfer through the aortic valve and its relevance to the cellular mechanical environment. Proc Inst Mech Eng H 2011; 225:821-30. [PMID: 21922958 DOI: 10.1177/0954411911406340] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Aortic valve interstitial cells are responsible for maintaining the valve in response to their local mechanical environment. However, the complex organization of the extracellular matrix means cell strains cannot be directly derived from gross strains, and knowledge of tissue structure-function correlations is fundamental towards understanding mechanotransduction. This study investigates strain transfer through the valve, hypothesizing that organization of the valve matrix leads to non-homogenous local strains. Radial and circumferential samples were cut from aortic valve leaflets and subjected to quasi-static mechanical characterization. Further samples were imaged using confocal microscopy, to determine local strains in the matrix. Mechanical data demonstrated that the valve was significantly stronger and stiffer when loaded circumferentially, comparable with previous studies. Micromechanical studies demonstrated that strain transfer through the matrix is anisotropic and indirect, with local strains consistently smaller than applied strains in both orientations. Under radial loading, strains were transferred linearly to cells. However, under circumferential loading, strains were only one-third of applied values, with a less direct relationship between applied and local strains. This may result from matrix reorganization, and be important for preventing cellular damage during normal valve function. These findings should be taken into account when investigating interstitial cell behaviours, such as cell metabolism and mechanotransduction.
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Affiliation(s)
- A D Lewinsohn
- Medical Engineering Division, School of Engineering and Materials Science, Queen Mary, University of London, London, UK
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Sarathchandra P, Smolenski RT, Yuen AHY, Chester AH, Goldstein S, Heacox AE, Yacoub MH, Taylor PM. Impact of γ-irradiation on extracellular matrix of porcine pulmonary valves. J Surg Res 2011; 176:376-85. [PMID: 22172131 DOI: 10.1016/j.jss.2011.10.011] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2011] [Revised: 09/26/2011] [Accepted: 10/12/2011] [Indexed: 11/25/2022]
Abstract
BACKGROUND The extracellular matrix plays an important role in heart valve function. To improve the processing of porcine pulmonary valves for clinical use, we have studied the influence of cryopreservation, decellularization, and irradiation on extracellular matrix components. METHODS Decellularization was carried out followed by DNAseI/RNAseA digestion and isotonic washout. Valves were cryopreserved in 10% DMSO/10% fetal bovine serum, and then subjected to 25-40 kGy γ-radiation. Extracellular matrix constituents were evaluated by histologic staining, immunohistochemistry, transmission electron microscopy, and liquid chromatography/mass spectrometry. RESULTS Histologic, immunohistochemical, ultrastructural, and biochemical analyses demonstrated a marked reduction in the expression of extracellular matrix components particularly in the valves that had been γ-irradiated following decellularization and cryopreservation. In this group, histology and immunohistochemistry showed an obvious reduction in staining for chondroitin sulphates, versican, hyaluronan, and collagens. Transmission electron microscopy revealed the smallest fibril diameter of collagen, shortest D-period, and loss of compactness of collagen fiber packaging and fragmentation of elastic fibers. Biochemical analysis showed loss of collagen and elastin crosslinks. Decellularization followed by cryopreservation showed some reduction in staining for collagens and versican, smaller diameter, shorter D-period in collagen fibers, and ridges in elastic fibers. Cryopreservation alone showed minimal changes in ECM staining intensity, collagen, and elastin ultrastructure and biochemistry. CONCLUSION γ-Irradiated valves that have been decellularized and cryopreserved produces significant changes in the expression of ECM components, thus providing useful information for improving valve preparation for clinical use and also some indication as to why irradiated human heart valves were not clinically successful.
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Affiliation(s)
- Padmini Sarathchandra
- Heart Science Centre, NHLI, Imperial College London, Harefield, Middlesex, United Kingdom.
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Abstract
The mitral valve is a living structure comprised of specific structural components which contain a heterogeneous population of cells. The cells include an amalgam of interstitial cells within the valve and a continuous covering of endothelial cells, each of which play a role in responding to the mechanical forces that the valve experiences, to maintain the function and durability of the valve. Attention on the characteristics and function of valve cells has focused mainly on those in the aortic valve, with relatively few studies addressing the role of these cells in the physiological and pathophysiological function of the mitral valve. This article reviews what is known about the function of cells within the mitral valve and how the changes in the physical and chemical environments can affect their function in the different types of mitral valve disease. Investigating the contribution of the cellular components of the mitral valve to valve function in health and disease will aid the understanding of how the durability and function of the valve are regulated, and possibly highlight molecular and pharmacological targets for the development of novel treatments for mitral valve disease.
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Affiliation(s)
- Kareem Salhiyyah
- Imperial College London, Heart Science Centre, Harefield, Middlesex, UB9 6JH, UK
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Balachandran K, Hussain S, Yap CH, Padala M, Chester AH, Yoganathan AP. Elevated cyclic stretch and serotonin result in altered aortic valve remodeling via a mechanosensitive 5-HT(2A) receptor-dependent pathway. Cardiovasc Pathol 2011; 21:206-13. [PMID: 21865058 DOI: 10.1016/j.carpath.2011.07.005] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/28/2010] [Revised: 05/29/2011] [Accepted: 07/06/2011] [Indexed: 11/26/2022] Open
Abstract
INTRODUCTION Serotonin/5-hydroxytryptamine (5-HT) has been implicated in valve disease and in the modulation of valve mechanical properties. Several 5-HT receptor subtypes are also known to be mechanosensitive in other cell types, but this has not been studied in the context of the valve. In this study, we sought to understand the effects of elevated 5-HT levels and stretch overload on aortic valve remodeling and the dominant 5-HT receptor subtype that regulates these processes. METHODS AND RESULTS Collagen biosynthesis and tissue mechanical properties of porcine aortic valve cusps were evaluated after 10% (physiologic) and 15% (pathologic) dynamic stretch. These studies were performed in normal medium or medium supplemented with 5-HT (1, 10, 100 μM) in the absence and presence of 5-HT(2A) or 5-HT(2B) receptor antagonists. Fresh valves served as controls. Valve collagen content was maximal at the 10-μM 5-HT concentration for both 10% and 15% stretch. The 5-HT(2A) receptor antagonist reduced collagen synthesis, cell proliferation, and hsp47 expression under elevated and normal stretch, whereas the 5-HT(2B) receptor antagonist was effective only at normal stretch. The pretransition stiffness of the valve cusps was also increased in response to 5-HT via a stretch-sensitive 5-HT(2A) mechanism, with the post-transition stiffness unaltered. CONCLUSIONS Combined elevated stretch and 5-HT resulted in increased valve collagen biosynthesis, cell proliferation, and tissue stiffness. These responses were inhibited by a 5-HT(2A) antagonist. This strongly suggests that the 5-HT(2A) receptor subtype is sensitive to elevated stretch.
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Affiliation(s)
- Kartik Balachandran
- The Wallace H. Coulter School of Biomedical Engineering, Georgia Institute of Technology, Atlanta, GA 30332-0535, USA
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Miragoli M, Moshkov A, Novak P, Shevchuk A, Nikolaev VO, El-Hamamsy I, Potter CMF, Wright P, Kadir SHSA, Lyon AR, Mitchell JA, Chester AH, Klenerman D, Lab MJ, Korchev YE, Harding SE, Gorelik J. Scanning ion conductance microscopy: a convergent high-resolution technology for multi-parametric analysis of living cardiovascular cells. J R Soc Interface 2011; 8:913-25. [PMID: 21325316 PMCID: PMC3104336 DOI: 10.1098/rsif.2010.0597] [Citation(s) in RCA: 55] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Cardiovascular diseases are complex pathologies that include alterations of various cell functions at the levels of intact tissue, single cells and subcellular signalling compartments. Conventional techniques to study these processes are extremely divergent and rely on a combination of individual methods, which usually provide spatially and temporally limited information on single parameters of interest. This review describes scanning ion conductance microscopy (SICM) as a novel versatile technique capable of simultaneously reporting various structural and functional parameters at nanometre resolution in living cardiovascular cells at the level of the whole tissue, single cells and at the subcellular level, to investigate the mechanisms of cardiovascular disease. SICM is a multimodal imaging technology that allows concurrent and dynamic analysis of membrane morphology and various functional parameters (cell volume, membrane potentials, cellular contraction, single ion-channel currents and some parameters of intracellular signalling) in intact living cardiovascular cells and tissues with nanometre resolution at different levels of organization (tissue, cellular and subcellular levels). Using this technique, we showed that at the tissue level, cell orientation in the inner and outer aortic arch distinguishes atheroprone and atheroprotected regions. At the cellular level, heart failure leads to a pronounced loss of T-tubules in cardiac myocytes accompanied by a reduction in Z-groove ratio. We also demonstrated the capability of SICM to measure the entire cell volume as an index of cellular hypertrophy. This method can be further combined with fluorescence to simultaneously measure cardiomyocyte contraction and intracellular calcium transients or to map subcellular localization of membrane receptors coupled to cyclic adenosine monophosphate production. The SICM pipette can be used for patch-clamp recordings of membrane potential and single channel currents. In conclusion, SICM provides a highly informative multimodal imaging platform for functional analysis of the mechanisms of cardiovascular diseases, which should facilitate identification of novel therapeutic strategies.
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Affiliation(s)
- Michele Miragoli
- Cardiovascular Science, National Heart and Lung Institute, Imperial College London, , Dovehouse Street, London SW36LY, UK
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Colazzo F, Sarathchandra P, Smolenski RT, Chester AH, Tseng YT, Czernuszka JT, Yacoub MH, Taylor PM. Extracellular matrix production by adipose-derived stem cells: Implications for heart valve tissue engineering. Biomaterials 2011; 32:119-27. [DOI: 10.1016/j.biomaterials.2010.09.003] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2010] [Accepted: 09/02/2010] [Indexed: 10/18/2022]
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Colazzo F, Chester AH, Taylor PM, Yacoub MH. Induction of mesenchymal to endothelial transformation of adipose-derived stem cells. J Heart Valve Dis 2010; 19:736-744. [PMID: 21214098] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
BACKGROUND AND AIM OF THE STUDY Adipose tissue is a readily available source of multipotent adult stem cells for use in tissue engineering and regenerative medicine. Adipose-derived stem cells (ADSCs) are currently being investigated as a source of interstitial cells to populate tissue-engineered heart valve constructs. However, the ability of these cells to differentiate into endothelial cells that would be required to cover the surface of the valve cusps has not been fully investigated. METHODS ADSCs were isolated and characterized using immunofluorescence and flow cytometry. Endothelial differentiation was promoted by culturing confluent cells in the presence of 2% fetal calf serum and 50 ng/ml vascular endothelial growth factor. Differentiation was evaluated by immunofluorescence staining for endothelial markers, and an analysis of acetylated low-density lipoprotein (Ac-LDL) uptake. An assessment of tubular formation was performed using an in vitro angiogenesis assay. RESULTS Isolated ADSCs were positive for the mesenchymal markers CD105, CD73, CD29, CD90 and CD44, and negative for hematopoietic and endothelial markers. After a seven-day treatment period, approximately 15% of ADSCs expressed the endothelial marker von Willebrand factor, and 70% had lost the expression of smooth muscle a-actin. Treated cells also were able to incorporate Ac-LDL, and also to form tubular structures on Matrigel, unlike control cells. CONCLUSION Based on these results, ADSCs are capable of differentiating into cells with phenotypic and functional features of endothelial cells. These predifferentiated cells provide new options for the tissue engineering of heart valves, based on autologous mesenchymal stem cells.
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Affiliation(s)
- Francesca Colazzo
- IRCCS Policlinico S. Donato, via Morandi 30, 20097, S. Donato Milanese, Milan, Italy.
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Norris RA, Moreno-Rodriguez R, Wessels A, Merot J, Bruneval P, Chester AH, Yacoub MH, Hagège A, Slaugenhaupt SA, Aikawa E, Schott JJ, Lardeux A, Harris BS, Williams LK, Richards A, Levine RA, Markwald RR. Expression of the familial cardiac valvular dystrophy gene, filamin-A, during heart morphogenesis. Dev Dyn 2010; 239:2118-27. [PMID: 20549728 DOI: 10.1002/dvdy.22346] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Abstract
Myxoid degeneration of the cardiac valves is a common feature in a heterogeneous group of disorders that includes Marfan syndrome and isolated valvular diseases. Mitral valve prolapse is the most common outcome of these and remains one of the most common indications for valvular surgery. While the etiology of the disease is unknown, recent genetic studies have demonstrated that an X-linked form of familial cardiac valvular dystrophy can be attributed to mutations in the Filamin-A gene. Since these inheritable mutations are present from conception, we hypothesize that filamin-A mutations present at the time of valve morphogenesis lead to dysfunction that progresses postnatally to clinically relevant disease. Therefore, by carefully evaluating genetic factors (such as filamin-A) that play a substantial role in MVP, we can elucidate relevant developmental pathways that contribute to its pathogenesis. In order to understand how developmental expression of a mutant protein can lead to valve disease, the spatio-temporal distribution of filamin-A during cardiac morphogenesis must first be characterized. Although previously thought of as a ubiquitously expressed gene, we demonstrate that filamin-A is robustly expressed in non-myocyte cells throughout cardiac morphogenesis including epicardial and endocardial cells, and mesenchymal cells derived by EMT from these two epithelia, as well as mesenchyme of neural crest origin. In postnatal hearts, expression of filamin-A is significantly decreased in the atrioventricular and outflow tract valve leaflets and their suspensory apparatus. Characterization of the temporal and spatial expression pattern of filamin-A during cardiac morphogenesis is a crucial first step in our understanding of how mutations in filamin-A result in clinically relevant valve disease.
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Affiliation(s)
- R A Norris
- Cardiovascular Developmental Biology Center, Department of Regenerative Medicine and Cell Biology, Children's Research Institute, Medical University of South Carolina, 173 Ashley Avenue, Charleston, SC 29425, USA.
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Din S, Sarathchandra P, Yacoub MH, Chester AH. Interaction between bone morphogenetic proteins and endothelin-1 in human pulmonary artery smooth muscle. Vascul Pharmacol 2009; 51:344-9. [PMID: 19786120 DOI: 10.1016/j.vph.2009.09.001] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2009] [Revised: 09/10/2009] [Accepted: 09/13/2009] [Indexed: 11/20/2022]
Abstract
Genetic mutations in bone morphogenetic protein receptor 2 (BMPR2) have been shown to occur in patients with familial and idiopathic pulmonary arterial hypertension (PAH). However the interactions between ligands for this receptor and other mediators implicated in heritable PAH have not been investigated. This study examines the regulation of endothelin-1 (ET-1), a potent vasoconstrictor and comitogen that is implicated in the pathogenesis of heritable PAH, by ligands for the BMPR2. Immunohistochemical studies showed that pulmonary artery segments removed from normotensive human lungs express BMPR2 and bone morphogenetic proteins 2, 4 and 7 (BMP2, BMP4 and BMP7). In the presence of BMP7 and BMP4 there was a significant inhibition of ET-1 release, induced by cytokines, from cultured pulmonary artery smooth muscle cells. Fresh ring segments of pulmonary artery were assessed for their response to ET-1 in the presence and absence of BMP2, BMP4 and BMP7. BMP7 inhibited contraction in response to ET-1 in a concentration-dependent manner. BMP2 and BMP4 had no significant effect on the response to ET-1. These results suggest that BMP7 has the ability to regulate the effects of endothelin-1 in the pulmonary circulation. Genetic mutations in BMPR2 may lead to a loss of these regulatory mechanisms and contribute to the pathogenesis of pulmonary hypertension.
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Affiliation(s)
- Sarah Din
- Imperial College London, Heart Science Centre, Harefield Hospital, Harefield, Middlesex, UB9 6JH, United Kingdom
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