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Ishii D, Enmi JI, Iwai R, Kurisu K, Tatsumi E, Nakayama Y. One year Rat Study of iBTA-induced “Microbiotube” Microvascular Grafts With an Ultra-Small Diameter of 0.6 mm. Eur J Vasc Endovasc Surg 2018; 55:882-887. [DOI: 10.1016/j.ejvs.2018.03.011] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2017] [Accepted: 03/08/2018] [Indexed: 12/20/2022]
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Ishii D, Enmi JI, Moriwaki T, Ishibashi-Ueda H, Kobayashi M, Iwana S, Iida H, Satow T, Takahashi JC, Kurisu K, Nakayama Y. Development of in vivo tissue-engineered microvascular grafts with an ultra small diameter of 0.6 mm (MicroBiotubes): acute phase evaluation by optical coherence tomography and magnetic resonance angiography. J Artif Organs 2016; 19:262-9. [PMID: 27003431 DOI: 10.1007/s10047-016-0894-9] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2015] [Accepted: 03/09/2016] [Indexed: 11/26/2022]
Abstract
Biotubes, i.e., in vivo tissue-engineered connective tubular tissues, are known to be effective as vascular replacement grafts with a diameter greater than several millimeters. However, the performance of biotubes with smaller diameters is less clear. In this study, MicroBiotubes with diameters <1 mm were prepared, and their patency was evaluated noninvasively by optical coherence tomography (OCT) and magnetic resonance angiography (MRA). MicroBiotube molds, containing seven stainless wires (diameter 0.5 mm) covered with silicone tubes (outer diameter 0.6 mm) per mold, were embedded into the dorsal subcutaneous pouches of rats. After 2 months, the molds were harvested with the surrounding capsular tissues to obtain seven MicroBiotubes (internal diameter 0.59 ± 0.015 mm, burst pressure 4190 ± 1117 mmHg). Ten-mm-long MicroBiotubes were allogenically implanted into the femoral arteries of rats by end-to-end anastomosis. Cross-sectional OCT imaging demonstrated the patency of the MicroBiotubes immediately after implantation. In a 1-month follow-up MRA, high patency (83.3 %, n = 6) was observed without stenosis, aneurysmal dilation, or elongation. Native-like vascular structure was reconstructed with completely endothelialized luminal surfaces, mesh-like elastin fiber networks, regular circumferential orientation of collagen fibers, and α-SMA-positive cells. Although the long-term patency of MicroBiotubes still needs to be confirmed, they may be useful as an alternative ultra-small-caliber vascular substitute.
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Affiliation(s)
- Daizo Ishii
- Division of Medical Engineering and Materials, National Cerebral and Cardiovascular Center Research Institute, 5-7-1 Fujishirodai, Suita, Osaka, 565-8565, Japan
- Department of Neurosurgery, Hiroshima University Graduate School of Biomedical and Health Sciences, Hiroshima, Japan
- Department of Neurosurgery, National Cerebral and Cardiovascular Center, Suita, Japan
| | - Jun-Ichiro Enmi
- Department of Investigative Radiology, National Cerebral and Cardiovascular Center Research Institute, Suita, Japan
| | - Takeshi Moriwaki
- Division of Medical Engineering and Materials, National Cerebral and Cardiovascular Center Research Institute, 5-7-1 Fujishirodai, Suita, Osaka, 565-8565, Japan
| | | | | | | | - Hidehiro Iida
- Department of Investigative Radiology, National Cerebral and Cardiovascular Center Research Institute, Suita, Japan
| | - Tetsu Satow
- Department of Neurosurgery, National Cerebral and Cardiovascular Center, Suita, Japan
| | - Jun C Takahashi
- Department of Neurosurgery, National Cerebral and Cardiovascular Center, Suita, Japan
| | - Kaoru Kurisu
- Department of Neurosurgery, Hiroshima University Graduate School of Biomedical and Health Sciences, Hiroshima, Japan
| | - Yasuhide Nakayama
- Division of Medical Engineering and Materials, National Cerebral and Cardiovascular Center Research Institute, 5-7-1 Fujishirodai, Suita, Osaka, 565-8565, Japan.
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Raffort J, Lareyre F, Clement M, Mallat Z. Micro-RNAs in abdominal aortic aneurysms: insights from animal models and relevance to human disease. Cardiovasc Res 2016; 110:165-77. [PMID: 26965051 DOI: 10.1093/cvr/cvw046] [Citation(s) in RCA: 42] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/28/2015] [Accepted: 01/28/2016] [Indexed: 01/09/2023] Open
Abstract
Abdominal aortic aneurysm (AAA) is a major health concern and may be associated with high rates of mortality linked to acute complications. Diagnosis and treatment are, respectively, based on imaging and surgical techniques. Drug-based therapies are still mostly ineffective, which highlight a real unmet need. Major pathophysiological mechanisms leading to aneurysm formation involve inflammatory processes, degradation of the extracellular matrix, and loss of smooth muscle cells. However, the precise cellular and molecular pathways are still poorly understood. Recently, microRNAs have emerged as major intracellular players in a wide range of biological processes, and their stability in extracellular medium within microvesicles has led to propose them as mediators of intercellular crosstalk and as potential biomarkers and therapeutic targets in a variety of disease settings. To date, several studies have been performed to address the involvement of micro-RNAs (miRs) in aneurysm formation and complications. Here, we discuss the roles and implications of miRs in animal models and their relevance to human AAA.
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Affiliation(s)
- Juliette Raffort
- Division of Cardiovascular Medicine, Department of Medicine, University of Cambridge, Cambridge CB20 SZ, UK University of Nice-Sophia Antipolis, Medical School, Nice 06107, France INSERM U1081, CNRS UMR7284, IRCAN, Nice, France Clinical Chemistry Laboratory, University Hospital of Nice, Nice, France
| | - Fabien Lareyre
- Division of Cardiovascular Medicine, Department of Medicine, University of Cambridge, Cambridge CB20 SZ, UK University of Nice-Sophia Antipolis, Medical School, Nice 06107, France INSERM U1081, CNRS UMR7284, IRCAN, Nice, France Department of Vascular Surgery, University Hospital of Nice, Nice, France
| | - Marc Clement
- Division of Cardiovascular Medicine, Department of Medicine, University of Cambridge, Cambridge CB20 SZ, UK
| | - Ziad Mallat
- Division of Cardiovascular Medicine, Department of Medicine, University of Cambridge, Cambridge CB20 SZ, UK Institut National de la Santé et de la Recherche Médicale (Inserm), Unit 970, Paris Cardiovascular Research Center, Paris 75015, France
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Itoh M, Nakayama K, Noguchi R, Kamohara K, Furukawa K, Uchihashi K, Toda S, Oyama JI, Node K, Morita S. Scaffold-Free Tubular Tissues Created by a Bio-3D Printer Undergo Remodeling and Endothelialization when Implanted in Rat Aortae. PLoS One 2015; 10:e0136681. [PMID: 26325298 PMCID: PMC4556622 DOI: 10.1371/journal.pone.0136681] [Citation(s) in RCA: 150] [Impact Index Per Article: 16.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2015] [Accepted: 08/06/2015] [Indexed: 12/23/2022] Open
Abstract
BACKGROUND Small caliber vascular prostheses are not clinically available because synthetic vascular prostheses lack endothelial cells which modulate platelet activation, leukocyte adhesion, thrombosis, and the regulation of vasomotor tone by the production of vasoactive substances. We developed a novel method to create scaffold-free tubular tissue from multicellular spheroids (MCS) using a "Bio-3D printer"-based system. This system enables the creation of pre-designed three-dimensional structures using a computer controlled robotics system. With this system, we created a tubular structure and studied its biological features. METHODS AND RESULTS Using a "Bio-3D printer," we made scaffold-free tubular tissues (inner diameter of 1.5 mm) from a total of 500 MCSs (2.5× 104 cells per one MCS) composed of human umbilical vein endothelial cells (40%), human aortic smooth muscle cells (10%), and normal human dermal fibroblasts (50%). The tubular tissues were cultured in a perfusion system and implanted into the abdominal aortas of F344 nude rats. We assessed the flow by ultrasonography and performed histological examinations on the second (n = 5) and fifth (n = 5) day after implantation. All grafts were patent and remodeling of the tubular tissues (enlargement of the lumen area and thinning of the wall) was observed. A layer of endothelial cells was confirmed five days after implantation. CONCLUSIONS The scaffold-free tubular tissues made of MCS using a Bio-3D printer underwent remodeling and endothelialization. Further studies are warranted to elucidate the underlying mechanism of endothelialization and its function, as well as the long-term results.
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Affiliation(s)
- Manabu Itoh
- Department of Thoracic and Cardiovascular Surgery, Faculty of Medicine, Saga University, Saga, Japan
| | - Koichi Nakayama
- Biomedical Engineering Course Advanced Technology, Fusion Graduate School of Science and Engineering, Saga University, Saga, Japan
| | - Ryo Noguchi
- Department of Thoracic and Cardiovascular Surgery, Faculty of Medicine, Saga University, Saga, Japan
| | - Keiji Kamohara
- Department of Thoracic and Cardiovascular Surgery, Faculty of Medicine, Saga University, Saga, Japan
| | - Kojirou Furukawa
- Department of Thoracic and Cardiovascular Surgery, Faculty of Medicine, Saga University, Saga, Japan
| | - Kazuyoshi Uchihashi
- Department of Pathology & Microbiology, Faculty of Medicine, Saga University, Saga, Japan
| | - Shuji Toda
- Department of Pathology & Microbiology, Faculty of Medicine, Saga University, Saga, Japan
| | - Jun-ichi Oyama
- Department of Cardiovascular Medicine, Faculty of Medicine, Saga University, Saga, Japan
| | - Koichi Node
- Department of Cardiovascular Medicine, Faculty of Medicine, Saga University, Saga, Japan
| | - Shigeki Morita
- Department of Thoracic and Cardiovascular Surgery, Faculty of Medicine, Saga University, Saga, Japan
- * E-mail:
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Nakayama Y, Tsujinaka T. Acceleration of robust “biotube” vascular graft fabrication by in-body tissue architecture technology using a novel eosin Y-releasing mold. J Biomed Mater Res B Appl Biomater 2013; 102:231-8. [DOI: 10.1002/jbm.b.32999] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2012] [Revised: 03/28/2013] [Accepted: 06/06/2013] [Indexed: 11/10/2022]
Affiliation(s)
- Yasuhide Nakayama
- Division of Medical Engineering and Materials; National Cerebral and Cardiovascular Center Research Institute; 5-7-1 Fujishiro-dai, Suita Osaka 565-8565 Japan
| | - Takahiro Tsujinaka
- Division of Medical Engineering and Materials; National Cerebral and Cardiovascular Center Research Institute; 5-7-1 Fujishiro-dai, Suita Osaka 565-8565 Japan
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Yamanami M, Ishibashi-Ueda H, Yamamoto A, Iida H, Watanabe T, Kanda K, Yaku H, Nakayama Y. Implantation study of small-caliber "biotube" vascular grafts in a rat model. J Artif Organs 2012. [PMID: 23192398 DOI: 10.1007/s10047-012-0676-y] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
We developed autologous vascular grafts, called "biotubes," by simple and safe in-body tissue architecture technology, which is a practical concept of regenerative medicine, without using special sterile conditions or complicated in vitro cell treatment processes. In this study, biotubes of extremely small caliber were first auto-implanted to rat abdominal aortas. Biotubes were prepared by placing silicone rods (outer diameter 1.5 mm, length 30 mm) used as a mold into dorsal subcutaneous pouches in rats for 4 weeks. After argatroban coating, the obtained biotubes were auto-implanted to abdominal aortas (n = 6) by end-to-end anastomosis using a custom-designed sutureless vascular connecting system under microscopic guidance. Graft status was evaluated by contrast-free time-of-flight magnetic resonance angiography (TOF-MRA). All grafts were harvested at 12 weeks after implantation. The patency rate was 66.7 % (4/6). MRA showed little stenosis and no aneurysmal dilation in all biotubes. The original biotube had wall thickness of about 56.2 ± 26.5 μm at the middle portion and mainly random and sparse collagen fibers and fibroblasts. After implantation, the wall thickness was 235.8 ± 24.8 μm. In addition, native-like vascular structure was regenerated, which included (1) a completely endothelialized luminal surface, (2) a mesh-like elastin fiber network, and (3) regular circumferential orientation of collagen fibers and α-SMA positive cells. Biotubes could be used as small-caliber vascular prostheses that greatly facilitate the healing process and exhibit excellent biocompatibility in vascular regenerative medicine.
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Affiliation(s)
- Masashi Yamanami
- Division of Medical Engineering and Materials, National Cerebral and Cardiovascular Center Research Institute, 5-7-1 Fujishiro-dai, Suita, Osaka, 565-8565, Japan.
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Harrington JK, Chahboune H, Criscione JM, Li AY, Hibino N, Yi T, Villalona GA, Kobsa S, Meijas D, Duncan DR, Devine L, Papademetri X, Shin'oka T, Fahmy TM, Breuer CK. Determining the fate of seeded cells in venous tissue-engineered vascular grafts using serial MRI. FASEB J 2011; 25:4150-61. [PMID: 21846838 DOI: 10.1096/fj.11-185140] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
A major limitation of tissue engineering research is the lack of noninvasive monitoring techniques for observations of dynamic changes in single tissue-engineered constructs. We use cellular magnetic resonance imaging (MRI) to track the fate of cells seeded onto functional tissue-engineered vascular grafts (TEVGs) through serial imaging. After in vitro optimization, murine macrophages were labeled with ultrasmall superparamagnetic iron oxide (USPIO) nanoparticles and seeded onto scaffolds that were surgically implanted as inferior vena cava interposition grafts in SCID/bg mice. Serial MRI showed the transverse relaxation times (T(2)) were significantly lower immediately following implantation of USPIO-labeled scaffolds (T(2) = 44 ± 6.8 vs. 71 ± 10.2 ms) but increased rapidly at 2 h to values identical to control implants seeded with unlabeled macrophages (T(2) = 63 ± 12 vs. 63 ± 14 ms). This strongly indicates the rapid loss of seeded cells from the scaffolds, a finding verified using Prussian blue staining for iron containing macrophages on explanted TEVGs. Our results support a novel paradigm where seeded cells are rapidly lost from implanted scaffolds instead of developing into cells of the neovessel, as traditionally thought. Our findings confirm and validate this paradigm shift while demonstrating the first successful application of noninvasive MRI for serial study of cellular-level processes in tissue engineering.
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Affiliation(s)
- Jamie K Harrington
- Interdepartmental Program in Vascular Biology and Therapeutics, Yale University School of Medicine, New Haven, CT 06510, USA
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