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Chan AHP, Moore MJ, Grant AJ, Lam YTM, Darnell MV, Michael PL, Wise SG, Tan RP. Selective Immunosuppression Targeting the NLRP3 Inflammasome Mitigates the Foreign Body Response to Implanted Biomaterials While Preserving Angiogenesis. Adv Healthc Mater 2023; 12:e2301571. [PMID: 37846971 DOI: 10.1002/adhm.202301571] [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: 05/16/2023] [Revised: 10/04/2023] [Indexed: 10/18/2023]
Abstract
Medical devices are a mainstay of the healthcare industry, providing clinicians with innovative tools to diagnose, monitor, and treat a range of medical conditions. For implantable devices, it is widely regarded that chronic inflammation during the foreign body response (FBR) is detrimental to device performance, but also required for tissue regeneration and host integration. Current strategies to mitigate the FBR rely on broad acting anti-inflammatory drugs, most commonly, dexamethasone (DEX), which can inhibit angiogenesis and compromise long-term device function. This study challenges prevailing assumptions by suggesting that FBR inflammation is multifaceted, and selectively targeting its individual pathways can stop implant fibrosis while preserving beneficial repair pathways linked to improved device performance. MCC950, an anti-inflammatory drug that selectively inhibits the NLRP3 inflammasome, targets pathological inflammation without compromising global immune function. The effects of MCC950 and DEX on the FBR are compared using implanted polycaprolactone (PCL) scaffolds. The results demonstrate that both DEX and MCC950 halt immune cell recruitment and cytokine release, leading to reduced FBR. However, MCC950 achieves this while supporting capillary growth and enhancing tissue angiogenesis. These findings support selective immunosuppression approaches as a potential future direction for treating the FBR and enhancing the longevity and safety of implantable devices.
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Affiliation(s)
- Alex H P Chan
- School of Medical Sciences, Faculty of Health and Medicine, University of Sydney, Sydney, NSW, 2006, Australia
- Charles Perkins Centre, University of Sydney, Sydney, NSW, 2006, Australia
| | - Matthew J Moore
- School of Medical Sciences, Faculty of Health and Medicine, University of Sydney, Sydney, NSW, 2006, Australia
- Charles Perkins Centre, University of Sydney, Sydney, NSW, 2006, Australia
| | - Angus J Grant
- School of Medical Sciences, Faculty of Health and Medicine, University of Sydney, Sydney, NSW, 2006, Australia
- Charles Perkins Centre, University of Sydney, Sydney, NSW, 2006, Australia
| | - Yuen Ting Monica Lam
- School of Medical Sciences, Faculty of Health and Medicine, University of Sydney, Sydney, NSW, 2006, Australia
- Charles Perkins Centre, University of Sydney, Sydney, NSW, 2006, Australia
| | - Matthew V Darnell
- School of Medical Sciences, Faculty of Health and Medicine, University of Sydney, Sydney, NSW, 2006, Australia
- Charles Perkins Centre, University of Sydney, Sydney, NSW, 2006, Australia
| | - Praveesuda L Michael
- School of Medical Sciences, Faculty of Health and Medicine, University of Sydney, Sydney, NSW, 2006, Australia
- Charles Perkins Centre, University of Sydney, Sydney, NSW, 2006, Australia
| | - Steven G Wise
- School of Medical Sciences, Faculty of Health and Medicine, University of Sydney, Sydney, NSW, 2006, Australia
- Charles Perkins Centre, University of Sydney, Sydney, NSW, 2006, Australia
| | - Richard P Tan
- School of Medical Sciences, Faculty of Health and Medicine, University of Sydney, Sydney, NSW, 2006, Australia
- Charles Perkins Centre, University of Sydney, Sydney, NSW, 2006, Australia
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2
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Chan AHP, Jain I, Oropeza BP, Zhou T, Nelsen B, Geisse NA, Huang NF. Combinatorial extracellular matrix cues with mechanical strain induce differential effects on myogenesis in vitro. Biomater Sci 2023; 11:5893-5907. [PMID: 37477446 PMCID: PMC10443049 DOI: 10.1039/d3bm00448a] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2023] [Accepted: 06/12/2023] [Indexed: 07/22/2023]
Abstract
Skeletal muscle regeneration remains a clinical unmet need for volumetric muscle loss and atrophy where muscle function cannot be restored to prior capacity. Current experimental approaches do not account for the complex microenvironmental factors that modulate myogenesis. In this study we developed a biomimetic tissue chip platform to systematically study the combined effects of the extracellular matrix (ECM) microenvironment and mechanical strain on myogenesis of murine myoblasts. Using stretchable tissue chips composed of collagen I (C), fibronectin (F) and laminin (L), as well as their combinations thereof, we tested the addition of mechanical strain regimens on myogenesis at the transcriptomic and translational levels. Our results show that ECMs have a significant effect on myotube formation in C2C12 murine myoblasts. Under static conditions, laminin substrates induced the longest myotubes, whereas fibronectin produced the widest myotubes. Combinatorial ECMs showed non-intuitive effects on myotube formation. Genome-wide analysis revealed the upregulation in actin cytoskeletal related genes that are suggestive of myogenesis. When mechanical strain was introduced to C + F + L combinatorial ECM substrates in the form of constant or intermittent uniaxial strain at low (5%) and high (15%) levels, we observed synergistic enhancements in myotube width, along with transcriptomic upregulation in myosin heavy chain genes. Together, these studies highlight the complex role of microenvironmental factors such as ECM interactions and strain on myotube formation and the underlying signaling pathways.
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Affiliation(s)
- Alex H P Chan
- Stanford Cardiovascular Institute, Stanford, CA, USA.
- Department of Cardiothoracic Surgery, Stanford University, Stanford, CA, USA
- Center for Tissue Regeneration, Repair and Restoration, Veterans Affairs Palo Alto Health Care System, Palo Alto, CA, USA
| | - Ishita Jain
- Stanford Cardiovascular Institute, Stanford, CA, USA.
- Department of Cardiothoracic Surgery, Stanford University, Stanford, CA, USA
- Center for Tissue Regeneration, Repair and Restoration, Veterans Affairs Palo Alto Health Care System, Palo Alto, CA, USA
| | - Beu P Oropeza
- Stanford Cardiovascular Institute, Stanford, CA, USA.
- Department of Cardiothoracic Surgery, Stanford University, Stanford, CA, USA
- Center for Tissue Regeneration, Repair and Restoration, Veterans Affairs Palo Alto Health Care System, Palo Alto, CA, USA
| | - Tony Zhou
- Stanford Cardiovascular Institute, Stanford, CA, USA.
- Department of Cardiothoracic Surgery, Stanford University, Stanford, CA, USA
| | | | | | - Ngan F Huang
- Stanford Cardiovascular Institute, Stanford, CA, USA.
- Department of Cardiothoracic Surgery, Stanford University, Stanford, CA, USA
- Center for Tissue Regeneration, Repair and Restoration, Veterans Affairs Palo Alto Health Care System, Palo Alto, CA, USA
- Department of Chemical Engineering, Stanford University, Stanford, CA 94305, USA
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Tan RP, Hung JC, Chan AHP, Grant AJ, Moore MJ, Lam YT, Michael P, Wise SG. Highly reproducible rat arterial injury model of neointimal hyperplasia. PLoS One 2023; 18:e0290342. [PMID: 37590291 PMCID: PMC10434902 DOI: 10.1371/journal.pone.0290342] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2023] [Accepted: 08/03/2023] [Indexed: 08/19/2023] Open
Abstract
Models of arterial injury in rodents have been invaluable to our current understanding of vessel restenosis and play a continuing role in the development of endovascular interventions for cardiovascular disease. Mechanical distention of the vessel wall and denudation of the vessel endothelium are the two major modes of vessel injury observed in most clinical pathologies and are critical to the reproducible modelling of progressive neointimal hyperplasia. The current models which have dominated this research area are the mouse wire carotid or femoral injury and the rat carotid balloon injury. While these elicit simultaneous distension of the vessel wall and denudation of the luminal endothelium, each model carries limitations that need to be addressed using a complementary injury model. Wire injuries in mice are highly technical and procedurally challenging due to small vessel diameters, while rat balloon injuries require permanent blood vessel ligation and disruption of native blood flow. Complementary models of vascular injury with reproducibility, convenience, and increased physiological relevance to the pathophysiology of endovascular injury would allow for improved studies of neointimal hyperplasia in both basic and translational research. In this study, we developed a new surgical model that elicits vessel distention and endothelial denudation injury using sequential steps using microforceps and a standard needle catheter inserted via arteriotomy into a rat common carotid artery, without requiring permanent ligation of branching arteries. After 2 weeks post-injury this model elicits highly reproducible neointimal hyperplasia and rates of re-endothelialisation similar to current wire and balloon injury models. Furthermore, evaluation of the smooth muscle cell phenotype profile, inflammatory response and extracellular matrix within the developing neointima, showed that our model replicated the vessel remodelling outcomes critical to restenosis and those becoming increasingly focused upon in the development of new anti-restenosis therapies.
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Affiliation(s)
- Richard P. Tan
- Faculty of Health and Medicine, School of Medical Sciences, University of Sydney, Sydney, NSW, Australia
- Charles Perkins Centre, University of Sydney, Sydney, NSW, Australia
| | - Jui Chien Hung
- Faculty of Health and Medicine, School of Medical Sciences, University of Sydney, Sydney, NSW, Australia
- Charles Perkins Centre, University of Sydney, Sydney, NSW, Australia
| | - Alex H. P. Chan
- Faculty of Health and Medicine, School of Medical Sciences, University of Sydney, Sydney, NSW, Australia
- Charles Perkins Centre, University of Sydney, Sydney, NSW, Australia
| | - Angus J. Grant
- Faculty of Health and Medicine, School of Medical Sciences, University of Sydney, Sydney, NSW, Australia
- Charles Perkins Centre, University of Sydney, Sydney, NSW, Australia
| | - Matthew J. Moore
- Faculty of Health and Medicine, School of Medical Sciences, University of Sydney, Sydney, NSW, Australia
- Charles Perkins Centre, University of Sydney, Sydney, NSW, Australia
| | - Yuen Ting Lam
- Faculty of Health and Medicine, School of Medical Sciences, University of Sydney, Sydney, NSW, Australia
- Charles Perkins Centre, University of Sydney, Sydney, NSW, Australia
| | - Praveesuda Michael
- Faculty of Health and Medicine, School of Medical Sciences, University of Sydney, Sydney, NSW, Australia
- Charles Perkins Centre, University of Sydney, Sydney, NSW, Australia
| | - Steven G. Wise
- Faculty of Health and Medicine, School of Medical Sciences, University of Sydney, Sydney, NSW, Australia
- Charles Perkins Centre, University of Sydney, Sydney, NSW, Australia
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4
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Grant AJ, Yang N, Moore MJ, Lam YT, Michael PL, Chan AHP, Santos M, Rnjak-Kovacina J, Tan RP, Wise SG. Selective NLRP3 Inflammasome Inhibitor MCC950 Suppresses Inflammation and Facilitates Healing in Vascular Materials. Adv Sci (Weinh) 2023:e2300521. [PMID: 37150865 PMCID: PMC10369291 DOI: 10.1002/advs.202300521] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Subscribe] [Scholar Register] [Received: 01/24/2023] [Revised: 03/31/2023] [Indexed: 05/09/2023]
Abstract
Minimally invasive interventions using drug-eluting stents or balloons are a first-line treatment for certain occlusive cardiovascular diseases, but the major long-term cause of failure is neointimal hyperplasia (NIH). The drugs eluted from these devices are non-specific anti-proliferative drugs, such as paclitaxel (PTX) or sirolimus (SMS), which do not address the underlying inflammation. MCC950 is a selective inhibitor of the NLRP3-inflammasome, which drives sterile inflammation commonly observed in NIH. Additionally, in contrast to broad-spectrum anti-inflammatory drugs, MCC950 does not compromise global immune function due this selective activity. In this study, MCC950 is found to not impact the viability, integrity, or function of human coronary endothelial cells, in contrast to the non-specific anti-proliferative effects of PTX and SMS. Using an in vitro model of NLRP3-mediated inflammation in murine macrophages, MCC950 reduced IL-1β expression, which is a key driver of NIH. In an in vivo mouse model of NIH in vascular grafts, MCC950 significantly enhanced re-endothelialization and reduced NIH compared to PTX or SMS. These findings show the effectiveness of a targeted anti-inflammatory drug-elution strategy with significant implications for cardiovascular device intervention.
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Affiliation(s)
- Angus J Grant
- School of Medical Sciences, Faculty of Health and Medicine, Charles Perkins Centre, University of Sydney, Sydney, NSW, 2006, Australia
| | - Nianji Yang
- School of Medical Sciences, Faculty of Health and Medicine, Charles Perkins Centre, University of Sydney, Sydney, NSW, 2006, Australia
| | - Matthew J Moore
- School of Medical Sciences, Faculty of Health and Medicine, Charles Perkins Centre, University of Sydney, Sydney, NSW, 2006, Australia
| | - Yuen Ting Lam
- School of Medical Sciences, Faculty of Health and Medicine, Charles Perkins Centre, University of Sydney, Sydney, NSW, 2006, Australia
| | - Praveesuda L Michael
- School of Medical Sciences, Faculty of Health and Medicine, Charles Perkins Centre, University of Sydney, Sydney, NSW, 2006, Australia
| | - Alex H P Chan
- School of Medical Sciences, Faculty of Health and Medicine, Charles Perkins Centre, University of Sydney, Sydney, NSW, 2006, Australia
| | - Miguel Santos
- School of Medical Sciences, Faculty of Health and Medicine, Charles Perkins Centre, University of Sydney, Sydney, NSW, 2006, Australia
| | - Jelena Rnjak-Kovacina
- Graduate School of Biomedical Engineering, University of New South Wales, Sydney, NSW, 2006, Australia
| | - Richard P Tan
- School of Medical Sciences, Faculty of Health and Medicine, Charles Perkins Centre, University of Sydney, Sydney, NSW, 2006, Australia
| | - Steven G Wise
- School of Medical Sciences, Faculty of Health and Medicine, Charles Perkins Centre, University of Sydney, Sydney, NSW, 2006, Australia
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Hu C, Ayan B, Chiang G, Chan AHP, Rando TA, Huang NF. Comparative Effects of Basic Fibroblast Growth Factor Delivery or Voluntary Exercise on Muscle Regeneration after Volumetric Muscle Loss. Bioengineering (Basel) 2022; 9:37. [PMID: 35049746 PMCID: PMC8773127 DOI: 10.3390/bioengineering9010037] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2021] [Revised: 01/05/2022] [Accepted: 01/11/2022] [Indexed: 12/29/2022] Open
Abstract
Volumetric muscle loss (VML) is associated with irreversibly impaired muscle function due to traumatic injury. Experimental approaches to treat VML include the delivery of basic fibroblast growth factor (bFGF) or rehabilitative exercise. The objective of this study was to compare the effects of spatially nanopatterned collagen scaffold implants with either bFGF delivery or in conjunction with voluntary exercise. Aligned nanofibrillar collagen scaffold bundles were adsorbed with bFGF, and the bioactivity of bFGF-laden scaffolds was examined by skeletal myoblast or endothelial cell proliferation. The therapeutic efficacy of scaffold implants with either bFGF release or exercise was examined in a murine VML model. Our results show an initial burst release of bFGF from the scaffolds, followed by a slower release over 21 days. The released bFGF induced myoblast and endothelial cell proliferation in vitro. After 3 weeks of implantation in a mouse VML model, twitch force generation was significantly higher in mice treated with bFGF-laden scaffolds compared to bFGF-laden scaffolds with exercise. However, myofiber density was not significantly improved with bFGF scaffolds or voluntary exercise. In contrast, the scaffold implant with exercise induced more re-innervation than all other groups. These results highlight the differential effects of bFGF and exercise on muscle regeneration.
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Affiliation(s)
- Caroline Hu
- Veterans Affairs Palo Alto Health Care System, Palo Alto, CA 94304, USA; (C.H.); (G.C.); (A.H.P.C.); (T.A.R.)
| | - Bugra Ayan
- Department of Cardiothoracic Surgery, Stanford University, Stanford, CA 94305, USA;
- Stanford Cardiovascular Institute, Stanford University, Stanford, CA 94305, USA
| | - Gladys Chiang
- Veterans Affairs Palo Alto Health Care System, Palo Alto, CA 94304, USA; (C.H.); (G.C.); (A.H.P.C.); (T.A.R.)
| | - Alex H. P. Chan
- Veterans Affairs Palo Alto Health Care System, Palo Alto, CA 94304, USA; (C.H.); (G.C.); (A.H.P.C.); (T.A.R.)
- Department of Cardiothoracic Surgery, Stanford University, Stanford, CA 94305, USA;
- Stanford Cardiovascular Institute, Stanford University, Stanford, CA 94305, USA
| | - Thomas A. Rando
- Veterans Affairs Palo Alto Health Care System, Palo Alto, CA 94304, USA; (C.H.); (G.C.); (A.H.P.C.); (T.A.R.)
- Department of Neurology, Stanford University, Stanford, CA 94305, USA
| | - Ngan F. Huang
- Veterans Affairs Palo Alto Health Care System, Palo Alto, CA 94304, USA; (C.H.); (G.C.); (A.H.P.C.); (T.A.R.)
- Department of Cardiothoracic Surgery, Stanford University, Stanford, CA 94305, USA;
- Stanford Cardiovascular Institute, Stanford University, Stanford, CA 94305, USA
- Department of Chemical Engineering, Stanford University, Stanford, CA 94305, USA
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6
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Mulorz J, Shayan M, Hu C, Alcazar C, Chan AHP, Briggs M, Wen Y, Walvekar AP, Ramasubramanian AK, Spin JM, Chen B, Tsao PS, Huang NF. peri-Adventitial delivery of smooth muscle cells in porous collagen scaffolds for treatment of experimental abdominal aortic aneurysm. Biomater Sci 2021; 9:6903-6914. [PMID: 34522940 PMCID: PMC8511090 DOI: 10.1039/d1bm00685a] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Abdominal aortic aneurysm (AAA) is associated with the loss of vascular smooth muscle cells (SMCs) within the vessel wall. Direct delivery of therapeutic cells is challenging due to impaired mechanical integrity of the vessel wall. We hypothesized that porous collagen scaffolds can be an effective vehicle for the delivery of human-derived SMCs to the site of AAA. The purpose was to evaluate if the delivery of cell-seeded scaffolds can abrogate progressive expansion in a mouse model of AAA. Collagen scaffolds seeded with either primary human aortic SMCs or induced pluripotent stem cell derived-smooth muscle progenitor cells (iPSC-SMPs) had >80% in vitro cell viability and >75% cell penetrance through the scaffold's depth, while preserving smooth muscle phenotype. The cell-seeded scaffolds were successfully transplanted onto the murine aneurysm peri-adventitia on day 7 following AAA induction using pancreatic porcine elastase infusion. Ultrasound imaging revealed that SMC-seeded scaffolds significantly reduced the aortic diameter by 28 days, compared to scaffolds seeded with iPSC-SMPs or without cells (acellular scaffold), respectively. Bioluminescence imaging demonstrated that both cell-seeded scaffold groups had cellular localization to the aneurysm but a decline in survival with time. Histological analysis revealed that both cell-seeded scaffold groups had more SMC retention and less macrophage invasion into the medial layer of AAA lesions, when compared to the acellular scaffold treatment group. Our data suggest that scaffold-based SMC delivery is feasible and may constitute a platform for cell-based AAA therapy.
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Affiliation(s)
- Joscha Mulorz
- Veterans Affairs Palo Alto Health Care System, Palo Alto, CA, USA.
- Division of Cardiovascular Medicine, Stanford University School of Medicine, Stanford, CA, USA
- Department of Vascular and Endovascular Surgery, Medical Faculty and University Hospital Düsseldorf, Heinrich-Heine-University, Düsseldorf, Germany
- Stanford Cardiovascular Institute, Stanford University, Stanford, CA, USA
| | - Mahdis Shayan
- Veterans Affairs Palo Alto Health Care System, Palo Alto, CA, USA.
- Stanford Cardiovascular Institute, Stanford University, Stanford, CA, USA
- Department Cardiothoracic Surgery, Stanford University School of Medicine, Stanford, CA, USA
| | - Caroline Hu
- Veterans Affairs Palo Alto Health Care System, Palo Alto, CA, USA.
| | - Cynthia Alcazar
- Veterans Affairs Palo Alto Health Care System, Palo Alto, CA, USA.
| | - Alex H P Chan
- Veterans Affairs Palo Alto Health Care System, Palo Alto, CA, USA.
- Stanford Cardiovascular Institute, Stanford University, Stanford, CA, USA
- Department Cardiothoracic Surgery, Stanford University School of Medicine, Stanford, CA, USA
| | - Mason Briggs
- Stanford University School of Medicine, Department of Obstetrics and Gynecology, Stanford, CA, USA
| | - Yan Wen
- Stanford University School of Medicine, Department of Obstetrics and Gynecology, Stanford, CA, USA
| | - Ankita P Walvekar
- Department of Chemical and Materials Engineering, San Jose State University, San Jose, CA, USA
| | - Anand K Ramasubramanian
- Department of Chemical and Materials Engineering, San Jose State University, San Jose, CA, USA
| | - Joshua M Spin
- Veterans Affairs Palo Alto Health Care System, Palo Alto, CA, USA.
- Division of Cardiovascular Medicine, Stanford University School of Medicine, Stanford, CA, USA
- Stanford Cardiovascular Institute, Stanford University, Stanford, CA, USA
| | - Bertha Chen
- Stanford University School of Medicine, Department of Obstetrics and Gynecology, Stanford, CA, USA
| | - Philip S Tsao
- Veterans Affairs Palo Alto Health Care System, Palo Alto, CA, USA.
- Division of Cardiovascular Medicine, Stanford University School of Medicine, Stanford, CA, USA
- Stanford Cardiovascular Institute, Stanford University, Stanford, CA, USA
| | - Ngan F Huang
- Veterans Affairs Palo Alto Health Care System, Palo Alto, CA, USA.
- Stanford Cardiovascular Institute, Stanford University, Stanford, CA, USA
- Department Cardiothoracic Surgery, Stanford University School of Medicine, Stanford, CA, USA
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Chan AHP, Huang NF. Engineering Cardiovascular Tissue Chips for Disease Modeling and Drug Screening Applications. Front Bioeng Biotechnol 2021; 9:673212. [PMID: 33959600 PMCID: PMC8093512 DOI: 10.3389/fbioe.2021.673212] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [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: 02/27/2021] [Accepted: 03/26/2021] [Indexed: 12/31/2022] Open
Abstract
In recent years, the cost of drug discovery and development have been progressively increasing, but the number of drugs approved for treatment of cardiovascular diseases (CVDs) has been limited. Current in vitro models for drug development do not sufficiently ensure safety and efficacy, owing to their lack of physiological relevance. On the other hand, preclinical animal models are extremely costly and present problems of inaccuracy due to species differences. To address these limitations, tissue chips offer the opportunity to emulate physiological and pathological tissue processes in a biomimetic in vitro platform. Tissue chips enable in vitro modeling of CVDs to give mechanistic insights, and they can also be a powerful approach for drug screening applications. Here, we review recent advances in CVD modeling using tissue chips and their applications in drug screening.
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Affiliation(s)
- Alex H P Chan
- Department of Cardiothoracic Surgery, Stanford University, Stanford, CA, United States.,Stanford Cardiovascular Institute, Stanford University, Stanford, CA, United States.,Veterans Affairs Palo Alto Health Care System, Palo Alto, CA, United States
| | - Ngan F Huang
- Department of Cardiothoracic Surgery, Stanford University, Stanford, CA, United States.,Stanford Cardiovascular Institute, Stanford University, Stanford, CA, United States.,Veterans Affairs Palo Alto Health Care System, Palo Alto, CA, United States
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Agarwal T, Fortunato GM, Hann SY, Ayan B, Vajanthri KY, Presutti D, Cui H, Chan AHP, Costantini M, Onesto V, Di Natale C, Huang NF, Makvandi P, Shabani M, Maiti TK, Zhang LG, De Maria C. Recent advances in bioprinting technologies for engineering cardiac tissue. Mater Sci Eng C Mater Biol Appl 2021; 124:112057. [PMID: 33947551 DOI: 10.1016/j.msec.2021.112057] [Citation(s) in RCA: 26] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/12/2021] [Revised: 03/09/2021] [Accepted: 03/12/2021] [Indexed: 12/12/2022]
Abstract
Annually increasing incidence of cardiac-related disorders and cardiac tissue's minimal regenerative capacity have motivated the researchers to explore effective therapeutic strategies. In the recent years, bioprinting technologies have witnessed a great wave of enthusiasm and have undergone steady advancements over a short period, opening the possibilities for recreating engineered functional cardiac tissue models for regenerative and diagnostic applications. With this perspective, the current review delineates recent developments in the sphere of engineered cardiac tissue fabrication, using traditional and advanced bioprinting strategies. The review also highlights different printing ink formulations, available cellular opportunities, and aspects of personalized medicines in the context of cardiac tissue engineering and bioprinting. On a concluding note, current challenges and prospects for further advancements are also discussed.
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Affiliation(s)
- Tarun Agarwal
- Department of Biotechnology, Indian Institute of Technology Kharagpur, West Bengal 721302, India
| | - Gabriele Maria Fortunato
- Research Center "E. Piaggio" and Department of Information Engineering, University of Pisa, Largo Lucio Lazzarino 1, 56122 Pisa, Italy
| | - Sung Yun Hann
- Department of Mechanical and Aerospace Engineering, The George Washington University, Washington, DC 20052, USA
| | - Bugra Ayan
- Department of Cardiothoracic Surgery, Stanford University, Stanford, CA, USA; Stanford Cardiovascular Institute, Stanford University, Stanford, CA, USA
| | - Kiran Yellappa Vajanthri
- School of Biomedical Engineering, Indian Institute of Technology Banaras Hindu University Varanasi, Uttar Pradesh 221005, India
| | - Dario Presutti
- Institute of Physical Chemistry - Polish Academy of Sciences, Warsaw, Poland
| | - Haitao Cui
- Department of Mechanical and Aerospace Engineering, The George Washington University, Washington, DC 20052, USA
| | - Alex H P Chan
- Department of Cardiothoracic Surgery, Stanford University, Stanford, CA, USA; Stanford Cardiovascular Institute, Stanford University, Stanford, CA, USA
| | - Marco Costantini
- Institute of Physical Chemistry - Polish Academy of Sciences, Warsaw, Poland
| | - Valentina Onesto
- Institute of Nanotechnology, National Research Council (CNR-NANOTEC), Campus Ecotekne, via Monteroni, Lecce 73100, Italy
| | - Concetta Di Natale
- Center for Advanced Biomaterial for Health Care (CABHC), Istituto Italiano di Tecnologia, Naples, Italy; Interdisciplinary Research Centre on Biomaterials (CRIB), University of Naples Federico II, P.leTecchio 80, Naples 80125, Italy
| | - Ngan F Huang
- Department of Cardiothoracic Surgery, Stanford University, Stanford, CA, USA; Stanford Cardiovascular Institute, Stanford University, Stanford, CA, USA; Veterans Affairs Palo Alto Health Care System, Palo Alto, CA, USA
| | - Pooyan Makvandi
- Center for Materials Interface, Istituto Italiano di Tecnologia, Pontedera 56025, Pisa, Italy
| | - Majid Shabani
- Center for Materials Interface, Istituto Italiano di Tecnologia, Pontedera 56025, Pisa, Italy
| | - Tapas Kumar Maiti
- Department of Biotechnology, Indian Institute of Technology Kharagpur, West Bengal 721302, India.
| | - Lijie Grace Zhang
- Department of Mechanical and Aerospace Engineering, The George Washington University, Washington, DC 20052, USA; Department of Electrical and Computer Engineering, The George Washington University, Washington, DC 20052, USA; Department of Biomedical Engineering, The George Washington University, Washington, DC 20052, USA; Department of Medicine, The George Washington University, Washington, DC 20052, USA.
| | - Carmelo De Maria
- Research Center "E. Piaggio" and Department of Information Engineering, University of Pisa, Largo Lucio Lazzarino 1, 56122 Pisa, Italy.
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Tan RP, Hallahan N, Kosobrodova E, Michael PL, Wei F, Santos M, Lam YT, Chan AHP, Xiao Y, Bilek MMM, Thorn P, Wise SG. Bioactivation of Encapsulation Membranes Reduces Fibrosis and Enhances Cell Survival. ACS Appl Mater Interfaces 2020; 12:56908-56923. [PMID: 33314916 DOI: 10.1021/acsami.0c20096] [Citation(s) in RCA: 4] [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] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Encapsulation devices are an emerging barrier technology designed to prevent the immunorejection of replacement cells in regenerative therapies for intractable diseases. However, traditional polymers used in current devices are poor substrates for cell attachment and induce fibrosis upon implantation, impacting long-term therapeutic cell viability. Bioactivation of polymer surfaces improves local host responses to materials, and here we make the first step toward demonstrating the utility of this approach to improve cell survival within encapsulation implants. Using therapeutic islet cells as an exemplar cell therapy, we show that internal surface coatings improve islet cell attachment and viability, while distinct external coatings modulate local foreign body responses. Using plasma surface functionalization (plasma immersion ion implantation (PIII)), we employ hollow fiber semiporous poly(ether sulfone) (PES) encapsulation membranes and coat the internal surfaces with the extracellular matrix protein fibronectin (FN) to enhance islet cell attachment. Separately, the external fiber surface is coated with the anti-inflammatory cytokine interleukin-4 (IL-4) to polarize local macrophages to an M2 (anti-inflammatory) phenotype, muting the fibrotic response. To demonstrate the power of our approach, bioluminescent murine islet cells were loaded into dual FN/IL-4-coated fibers and evaluated in a mouse back model for 14 days. Dual FN/IL-4 fibers showed striking reductions in immune cell accumulation and elevated levels of the M2 macrophage phenotype, consistent with the suppression of fibrotic encapsulation and enhanced angiogenesis. These changes led to markedly enhanced islet cell survival and importantly to functional integration of the implant with the host vasculature. Dual FN/IL-4 surface coatings drive multifaceted improvements in islet cell survival and function, with significant implications for improving clinical translation of therapeutic cell-containing macroencapsulation implants.
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Affiliation(s)
- Richard P Tan
- Department of Physiology, School of Medical Sciences, University of Sydney, Camperdown, NSW 2006, Australia
- Charles Perkins Centre, University of Sydney, John Hopkins Drive, Camperdown, NSW 2006, Australia
| | - Nicole Hallahan
- Department of Physiology, School of Medical Sciences, University of Sydney, Camperdown, NSW 2006, Australia
- Charles Perkins Centre, University of Sydney, John Hopkins Drive, Camperdown, NSW 2006, Australia
| | - Elena Kosobrodova
- Applied Plasma and Physics, A28, School of Physics, University of Sydney, Physics Road, Camperdown, NSW 2006, Australia
| | - Praveesuda L Michael
- Department of Physiology, School of Medical Sciences, University of Sydney, Camperdown, NSW 2006, Australia
- Charles Perkins Centre, University of Sydney, John Hopkins Drive, Camperdown, NSW 2006, Australia
| | - Fei Wei
- Institute of Health and Biomedical Innovation, Queensland University of Technology, 60 Musk Avenue, Kelvin Grove, QLD 4000, Australia
| | - Miguel Santos
- Department of Physiology, School of Medical Sciences, University of Sydney, Camperdown, NSW 2006, Australia
- Charles Perkins Centre, University of Sydney, John Hopkins Drive, Camperdown, NSW 2006, Australia
| | - Yuen Ting Lam
- Department of Physiology, School of Medical Sciences, University of Sydney, Camperdown, NSW 2006, Australia
- Charles Perkins Centre, University of Sydney, John Hopkins Drive, Camperdown, NSW 2006, Australia
| | - Alex H P Chan
- Department of Cardiothoracic Surgery, Stanford University, Stanford, CA 94305, United States
| | - Yin Xiao
- Institute of Health and Biomedical Innovation, Queensland University of Technology, 60 Musk Avenue, Kelvin Grove, QLD 4000, Australia
| | - Marcela M M Bilek
- Applied Plasma and Physics, A28, School of Physics, University of Sydney, Physics Road, Camperdown, NSW 2006, Australia
| | - Peter Thorn
- Department of Physiology, School of Medical Sciences, University of Sydney, Camperdown, NSW 2006, Australia
- Charles Perkins Centre, University of Sydney, John Hopkins Drive, Camperdown, NSW 2006, Australia
| | - Steven G Wise
- Department of Physiology, School of Medical Sciences, University of Sydney, Camperdown, NSW 2006, Australia
- Charles Perkins Centre, University of Sydney, John Hopkins Drive, Camperdown, NSW 2006, Australia
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10
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Yang N, Tan RP, Chan AHP, Lee BSL, Santos M, Hung J, Liao Y, Bilek MMM, Fei J, Wise SG, Bao S. Immobilized Macrophage Colony-Stimulating Factor (M-CSF) Regulates the Foreign Body Response to Implanted Materials. ACS Biomater Sci Eng 2020; 6:995-1007. [PMID: 33464851 DOI: 10.1021/acsbiomaterials.9b01887] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [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: 01/07/2023]
Abstract
The functionality and durability of implanted biomaterials are often compromised by an exaggerated foreign body reaction (FBR). M1/M2 polarization of macrophages is a critical regulator of scaffold-induced FBR. Macrophage colony-stimulating factor (M-CSF), a hematopoietic growth factor, induces macrophages into an M2-like polarized state, leading to immunoregulation and promoting tissue repair. In the present study, we explored the immunomodulatory effects of surface bound M-CSF on poly-l-lactic acid (PLLA)-induced FBR. M-CSF was immobilized on the surface of PLLA via plasma immersion ion implantation (PIII). M-CSF functionalized PLLA, PLLA-only, and PLLA+PIII were assessed in an IL-1β luciferase reporter mouse to detect real-time levels of IL-1β expression, reflecting acute inflammation in vivo. Additionally, these different treated scaffolds were implanted subcutaneously into wild-type mice to explore the effect of M-CSF in polarization of M2-like macrophages (CD68+/CD206+), related cytokines (pro-inflammatory: IL-1β, TNF and MCP-1; anti-inflammatory: IL-10 and TGF-β), and angiogenesis (CD31) by immunofluorescent staining. Our data demonstrated that IL-1β activity in M-CSF functionalized scaffolds was ∼50% reduced compared to PLLA-only at day 1 (p < 0.01) and day 2 (p < 0.05) post-implantation. There were >2.6-fold more CD206+ macrophages in M-CSF functionalized PLLA compared to PLLA-only at day 7 (p < 0.001), along with higher levels of IL-10 at both day 7 (p < 0.05) and day 14 (p < 0.01), and TGF-β at day 3 (p < 0.05), day 7 (p < 0.05), and day 14 (p < 0.001). Lower levels of pro-inflammatory cytokines were also detected in M-CSF functionalized PLLA in the early phase of the immune response compared to PLLA-only: a ∼58% decrease at day 3 in IL-1β; a ∼91% decrease at day 3 and a ∼66% decrease at day 7 in TNF; and a ∼60% decrease at day 7 in MCP-1. Moreover, enhanced angiogenesis inside and on/near the scaffold was observed in M-CSF functionalized PLLA compared to PLLA-only at day 3 (p < 0.05) and day 7 (p < 0.05), respectively. Overall, M-CSF functionalized PLLA enhanced CD206+ macrophage polarization and angiogenesis, consistent with lower levels of pro-inflammatory cytokines and higher levels of anti-inflammatory cytokines in early stages of the host response, indicating potential immunoregulatory functions on the local environment.
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Affiliation(s)
- Nianji Yang
- Discipline of Pathology, University of Sydney, Sydney, New South Wales 2006, Australia.,Discipline of Physiology, University of Sydney, Sydney, New South Wales 2006, Australia.,The Heart Research Institute, Sydney, Australia.,Charles Perkins Centre, University of Sydney, Sydney, New South Wales 2006, Australia
| | - Richard P Tan
- Discipline of Physiology, University of Sydney, Sydney, New South Wales 2006, Australia.,The Heart Research Institute, Sydney, Australia.,Charles Perkins Centre, University of Sydney, Sydney, New South Wales 2006, Australia
| | | | - Bob S L Lee
- Discipline of Physiology, University of Sydney, Sydney, New South Wales 2006, Australia.,The Heart Research Institute, Sydney, Australia.,Charles Perkins Centre, University of Sydney, Sydney, New South Wales 2006, Australia
| | - Miguel Santos
- Discipline of Physiology, University of Sydney, Sydney, New South Wales 2006, Australia.,The Heart Research Institute, Sydney, Australia.,Charles Perkins Centre, University of Sydney, Sydney, New South Wales 2006, Australia
| | - Juichien Hung
- Discipline of Physiology, University of Sydney, Sydney, New South Wales 2006, Australia.,The Heart Research Institute, Sydney, Australia.,Charles Perkins Centre, University of Sydney, Sydney, New South Wales 2006, Australia
| | - Yun Liao
- Department of Pharmacy, Tongren Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China
| | - Marcela M M Bilek
- Charles Perkins Centre, University of Sydney, Sydney, New South Wales 2006, Australia.,School of Physics, University of Sydney, Sydney, New South Wales 2006, Australia
| | - Jian Fei
- School of Life Science and Technology, Shanghai Tongji University, Shanghai, China.,Research Centre for Model Organism, Shanghai, China
| | - Steven G Wise
- Discipline of Physiology, University of Sydney, Sydney, New South Wales 2006, Australia.,The Heart Research Institute, Sydney, Australia.,Charles Perkins Centre, University of Sydney, Sydney, New South Wales 2006, Australia
| | - Shisan Bao
- Discipline of Pathology, University of Sydney, Sydney, New South Wales 2006, Australia.,Charles Perkins Centre, University of Sydney, Sydney, New South Wales 2006, Australia
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11
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Chan AHP, Filipe EC, Tan RP, Santos M, Yang N, Hung J, Feng J, Nazir S, Benn AJ, Ng MKC, Rnjak-Kovacina J, Wise SG. Altered processing enhances the efficacy of small-diameter silk fibroin vascular grafts. Sci Rep 2019; 9:17461. [PMID: 31767928 PMCID: PMC6877724 DOI: 10.1038/s41598-019-53972-y] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [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: 03/14/2019] [Accepted: 11/06/2019] [Indexed: 01/24/2023] Open
Abstract
Current synthetic vascular grafts are not suitable for use in low-diameter applications. Silk fibroin is a promising natural graft material which may be an effective alternative. In this study, we compared two electrospun silk grafts with different manufacturing processes, using either water or hexafluoroisopropanol (HFIP) as solvent. This resulted in markedly different Young's modulus, ultimate tensile strength and burst pressure, with HFIP spun grafts observed to have thicker fibres, and greater stiffness and strength relative to water spun. Assessment in a rat abdominal aorta grafting model showed significantly faster endothelialisation of the HFIP spun graft relative to water spun. Neointimal hyperplasia in the HFIP graft also stabilised significantly earlier, correlated with an earlier SMC phenotype switch from synthetic to contractile, increasing extracellular matrix protein density. An initial examination of the macrophage response showed that HFIP spun conduits promoted an anti-inflammatory M2 phenotype at early timepoints while reducing the pro-inflammatory M1 phenotype relative to water spun grafts. These observations demonstrate the important role of the manufacturing process and physical graft properties in determining the physiological response. Our study is the first to comprehensively study these differences for silk in a long-term rodent model.
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Affiliation(s)
- Alex H P Chan
- The Heart Research Institute, 7 Eliza Street, Newtown, Sydney, NSW, 2042, Australia.,Sydney Medical School, University of Sydney, Sydney, NSW, 2006, Australia
| | - Elysse C Filipe
- Garvan Institute of Medical Research & The Kinghorn Cancer Center, Sydney, NSW, 2010, Australia.,St Vincent's Clinical School, Faculty of Medicine, UNSW Sydney, Sydney, NSW, 2010, Australia
| | - Richard P Tan
- The Heart Research Institute, 7 Eliza Street, Newtown, Sydney, NSW, 2042, Australia.,Sydney Medical School, University of Sydney, Sydney, NSW, 2006, Australia
| | - Miguel Santos
- The Heart Research Institute, 7 Eliza Street, Newtown, Sydney, NSW, 2042, Australia.,Sydney Medical School, University of Sydney, Sydney, NSW, 2006, Australia
| | - Nianji Yang
- The Heart Research Institute, 7 Eliza Street, Newtown, Sydney, NSW, 2042, Australia
| | - Juichien Hung
- The Heart Research Institute, 7 Eliza Street, Newtown, Sydney, NSW, 2042, Australia
| | - Jieyao Feng
- The Heart Research Institute, 7 Eliza Street, Newtown, Sydney, NSW, 2042, Australia
| | - Sidra Nazir
- The Heart Research Institute, 7 Eliza Street, Newtown, Sydney, NSW, 2042, Australia
| | - Alexander J Benn
- The Heart Research Institute, 7 Eliza Street, Newtown, Sydney, NSW, 2042, Australia
| | - Martin K C Ng
- Sydney Medical School, University of Sydney, Sydney, NSW, 2006, Australia.,Department of Cardiology, Royal Prince Alfred Hospital, Camperdown, Sydney, NSW, 2050, Australia
| | - Jelena Rnjak-Kovacina
- Graduate School of Biomedical Engineering, UNSW Sydney, Sydney, NSW, 2052, Australia.
| | - Steven G Wise
- The Heart Research Institute, 7 Eliza Street, Newtown, Sydney, NSW, 2042, Australia. .,Sydney Medical School, University of Sydney, Sydney, NSW, 2006, Australia. .,School of Medical Sciences, Dept of Physiology, University of Sydney, Sydney, NSW, 2006, Australia. .,Charles Perkins Centre, University of Sydney, Sydney, NSW, 2006, Australia.
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12
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Tan RP, Chan AHP, Lennartsson K, Miravet MM, Lee BSL, Rnjak-Kovacina J, Clayton ZE, Cooke JP, Ng MKC, Patel S, Wise SG. Integration of induced pluripotent stem cell-derived endothelial cells with polycaprolactone/gelatin-based electrospun scaffolds for enhanced therapeutic angiogenesis. Stem Cell Res Ther 2018; 9:70. [PMID: 29562916 PMCID: PMC5863387 DOI: 10.1186/s13287-018-0824-2] [Citation(s) in RCA: 40] [Impact Index Per Article: 6.7] [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: 01/10/2018] [Revised: 02/19/2018] [Accepted: 03/05/2018] [Indexed: 02/06/2023] Open
Abstract
BACKGROUND Induced pluripotent stem-cell derived endothelial cells (iPSC-ECs) can be generated from any somatic cell and their iPSC sources possess unlimited self-renewal. Previous demonstration of their proangiogenic activity makes them a promising cell type for treatment of ischemic injury. As with many other stem cell approaches, the low rate of in-vivo survival has been a major limitation to the efficacy of iPSC-ECs to date. In this study, we aimed to increase the in-vivo lifetime of iPSC-ECs by culturing them on electrospun polycaprolactone (PCL)/gelatin scaffolds, before quantifying the subsequent impact on their proangiogenic function. METHODS iPSC-ECs were isolated and stably transfected with a luciferase reporter to facilitate quantification of cell numbers and non-invasive imaging in-vivo PCL/gelatin scaffolds were engineered using electrospinning to obtain woven meshes of nanofibers. iPSC-ECs were cultured on scaffolds for 7 days. Subsequently, cell growth and function were assessed in vitro followed by implantation in a mouseback subcutaneous model for 7 days. RESULTS Using a matrix of conditions, we found that scaffold blends with ratios of PCL:gelatin of 70:30 (PG73) spun at high flow rates supported the greatest levels of iPSC-EC growth, retention of phenotype, and function in vitro. Implanting iPSC-ECs seeded on PG73 scaffolds in vivo improved their survival up to 3 days, compared to cells directly injected into control wounds, which were no longer observable within 1 h. Enhanced engraftment improved blood perfusion, observed through non-invasive laser Doppler imaging. Immunohistochemistry revealed a corresponding increase in host angiogenic mechanisms characterized by the enhanced recruitment of macrophages and the elevated expression of proangiogenic cytokines vascular endothelial growth factor and placental growth factor. CONCLUSIONS Knowledge of these mechanisms combined with a deeper understanding of the scaffold parameters influencing this function provides the groundwork for optimizing future iPSC-EC therapies utilizing engraftment platforms. The development of combined scaffold and iPSC-EC therapies could ultimately improve therapeutic angiogenesis and the treatment of ischemic injury.
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Affiliation(s)
- Richard P Tan
- The Heart Research Institute, Sydney, NSW, 2042, Australia. .,Sydney Medical School, University of Sydney, Sydney, NSW, 2006, Australia.
| | - Alex H P Chan
- The Heart Research Institute, Sydney, NSW, 2042, Australia.,Sydney Medical School, University of Sydney, Sydney, NSW, 2006, Australia
| | | | | | - Bob S L Lee
- The Heart Research Institute, Sydney, NSW, 2042, Australia.,Sydney Medical School, University of Sydney, Sydney, NSW, 2006, Australia
| | - Jelena Rnjak-Kovacina
- Graduate School of Biomedical Engineering, University of New South Wales, Sydney, NSW, 2052, Australia
| | - Zoe E Clayton
- The Heart Research Institute, Sydney, NSW, 2042, Australia
| | - John P Cooke
- Department of Cardiovascular Sciences, Houston Methodist Research Institute, Houston, TX, 77030, USA
| | - Martin K C Ng
- The Heart Research Institute, Sydney, NSW, 2042, Australia.,Royal Prince Alfred Hospital, Sydney, NSW, 2042, Australia
| | - Sanjay Patel
- The Heart Research Institute, Sydney, NSW, 2042, Australia.,Royal Prince Alfred Hospital, Sydney, NSW, 2042, Australia
| | - Steven G Wise
- The Heart Research Institute, Sydney, NSW, 2042, Australia.,Sydney Medical School, University of Sydney, Sydney, NSW, 2006, Australia
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13
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Chan AHP, Tan RP, Michael PL, Lee BSL, Vanags LZ, Ng MKC, Bursill CA, Wise SG. Evaluation of synthetic vascular grafts in a mouse carotid grafting model. PLoS One 2017; 12:e0174773. [PMID: 28355300 PMCID: PMC5371373 DOI: 10.1371/journal.pone.0174773] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [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: 11/30/2016] [Accepted: 03/15/2017] [Indexed: 11/24/2022] Open
Abstract
Current animal models for the evaluation of synthetic grafts are lacking many of the molecular tools and transgenic studies available to other branches of biology. A mouse model of vascular grafting would allow for the study of molecular mechanisms of graft failure, including in the context of clinically relevant disease states. In this study, we comprehensively characterise a sutureless grafting model which facilitates the evaluation of synthetic grafts in the mouse carotid artery. Using conduits electrospun from polycaprolactone (PCL) we show the gradual development of a significant neointima within 28 days, found to be greatest at the anastomoses. Histological analysis showed temporal increases in smooth muscle cell and collagen content within the neointima, demonstrating its maturation. Endothelialisation of the PCL grafts, assessed by scanning electron microscopy (SEM) analysis and CD31 staining, was near complete within 28 days, together replicating two critical aspects of graft performance. To further demonstrate the potential of this mouse model, we used longitudinal non-invasive tracking of bone-marrow mononuclear cells from a transgenic mouse strain with a dual reporter construct encoding both luciferase and green fluorescent protein (GFP). This enabled characterisation of mononuclear cell homing and engraftment to PCL using bioluminescence imaging and histological staining over time (7, 14 and 28 days). We observed peak luminescence at 7 days post-graft implantation that persisted until sacrifice at 28 days. Collectively, we have established and characterised a high-throughput model of grafting that allows for the evaluation of key clinical drivers of graft performance.
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Affiliation(s)
- Alex H. P. Chan
- The Heart Research Institute, Sydney, New South Wales, Australia
- Sydney Medical School, University of Sydney, Sydney, New South Wales, Australia
| | - Richard P. Tan
- The Heart Research Institute, Sydney, New South Wales, Australia
- Sydney Medical School, University of Sydney, Sydney, New South Wales, Australia
| | - Praveesuda L. Michael
- The Heart Research Institute, Sydney, New South Wales, Australia
- Sydney Medical School, University of Sydney, Sydney, New South Wales, Australia
| | - Bob S. L. Lee
- The Heart Research Institute, Sydney, New South Wales, Australia
| | - Laura Z. Vanags
- The Heart Research Institute, Sydney, New South Wales, Australia
- Sydney Medical School, University of Sydney, Sydney, New South Wales, Australia
| | - Martin K. C. Ng
- The Heart Research Institute, Sydney, New South Wales, Australia
- Sydney Medical School, University of Sydney, Sydney, New South Wales, Australia
- Royal Prince Alfred Hospital, Sydney, New South Wales, Australia
| | - Christina A. Bursill
- The Heart Research Institute, Sydney, New South Wales, Australia
- Sydney Medical School, University of Sydney, Sydney, New South Wales, Australia
| | - Steven G. Wise
- The Heart Research Institute, Sydney, New South Wales, Australia
- Sydney Medical School, University of Sydney, Sydney, New South Wales, Australia
- School of Life and Environmental Sciences, University of Sydney, Sydney, New South Wales, Australia
- * E-mail:
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14
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Wise SG, Liu H, Yeo GC, Michael PL, Chan AHP, Ngo AKY, Bilek MMM, Bao S, Weiss AS. Blended Polyurethane and Tropoelastin as a Novel Class of Biologically Interactive Elastomer. Tissue Eng Part A 2016; 22:524-33. [PMID: 26857114 DOI: 10.1089/ten.tea.2015.0409] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023] Open
Abstract
Polyurethanes are versatile elastomers but suffer from biological limitations such as poor control over cell attachment and the associated disadvantages of increased fibrosis. We address this problem by presenting a novel strategy that retains elasticity while modulating biological performance. We describe a new biomaterial that comprises a blend of synthetic and natural elastomers: the biostable polyurethane Elast-Eon and the recombinant human tropoelastin protein. We demonstrate that the hybrid constructs yield a class of coblended elastomers with unique physical properties. Hybrid constructs displayed higher elasticity and linear stress-strain responses over more than threefold strain. The hybrid materials showed increased overall porosity and swelling in comparison to polyurethane alone, facilitating enhanced cellular interactions. In vitro, human dermal fibroblasts showed enhanced proliferation, while in vivo, following subcutaneous implantation in mice, hybrid scaffolds displayed a reduced fibrotic response and tunable degradation rate. To our knowledge, this is the first example of a blend of synthetic and natural elastomers and is a promising approach for generating tailored bioactive scaffolds for tissue repair.
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Affiliation(s)
- Steven G Wise
- 1 The Heart Research Institute , Sydney, Australia .,2 Sydney Medical School, University of Sydney , Sydney, Australia .,3 School of Molecular Bioscience, University of Sydney , Sydney, Australia
| | - Hongjuan Liu
- 2 Sydney Medical School, University of Sydney , Sydney, Australia .,4 Discipline of Pathology and School of Medical Science, University of Sydney , Sydney, Australia .,5 Charles Perkins Centre, University of Sydney , Sydney, Australia .,6 Bosch Institute, University of Sydney , Sydney, Australia
| | - Giselle C Yeo
- 3 School of Molecular Bioscience, University of Sydney , Sydney, Australia .,5 Charles Perkins Centre, University of Sydney , Sydney, Australia
| | - Praveesuda L Michael
- 1 The Heart Research Institute , Sydney, Australia .,2 Sydney Medical School, University of Sydney , Sydney, Australia
| | - Alex H P Chan
- 1 The Heart Research Institute , Sydney, Australia .,2 Sydney Medical School, University of Sydney , Sydney, Australia
| | - Alan K Y Ngo
- 3 School of Molecular Bioscience, University of Sydney , Sydney, Australia
| | | | - Shisan Bao
- 2 Sydney Medical School, University of Sydney , Sydney, Australia .,4 Discipline of Pathology and School of Medical Science, University of Sydney , Sydney, Australia .,5 Charles Perkins Centre, University of Sydney , Sydney, Australia .,6 Bosch Institute, University of Sydney , Sydney, Australia
| | - Anthony S Weiss
- 3 School of Molecular Bioscience, University of Sydney , Sydney, Australia .,5 Charles Perkins Centre, University of Sydney , Sydney, Australia .,6 Bosch Institute, University of Sydney , Sydney, Australia
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