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Higashita R, Nakayama Y, Miyazaki M, Yokawa Y, Iwai R, Funayama-Iwai M. Dramatic Wound Closing Effect of a Single Application of an iBTA-Induced Autologous Biosheet on Severe Diabetic Foot Ulcers Involving the Heel Area. Bioengineering (Basel) 2024; 11:462. [PMID: 38790329 PMCID: PMC11117490 DOI: 10.3390/bioengineering11050462] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2024] [Revised: 04/30/2024] [Accepted: 04/30/2024] [Indexed: 05/26/2024] Open
Abstract
INTRODUCTION Chronic wounds caused by diabetes or lower-extremity artery disease are intractable because the wound healing mechanism becomes ineffective due to the poor environment of the wound bed. Biosheets obtained using in-body tissue architecture (iBTA) are collagen-based membranous tissue created within the body and which autologously contain various growth factors and somatic stem cells including SSEA4-posituve cells. When applied to a wound, granulation formation can be promoted and epithelialization may even be achieved. Herein, we report our clinical treatment experience with seven cases of intractable diabetic foot ulcers. CASES Seven patients, from 46 to 93 years old, had large foot ulcers including in the heel area, which were failing to heal with standard wound treatment. METHODS Two or four Biosheet-forming molds were embedded subcutaneously in the chest or abdomen, and after 3 to 6 weeks, the molds were removed. Biosheets that formed inside the mold were obtained and applied directly to the wound surface. RESULTS In all cases, there were no problems with the mold's embedding and removal procedures, and Biosheets were formed without any infection or inflammation during the embedding period. The Biosheets were simply applied to the wounds, and in all cases they adhered within one week, did not fall off, and became integrated with the wound surface. Complete wound closure was achieved within 8 weeks in two cases and within 5 months in two cases. One patient was lost due to infective endocarditis from septic colitis. One case required lower leg amputation due to wound recurrence, and one case achieved wound reduction and wound healing in approximately 9 months. CONCLUSIONS Biosheets obtained via iBTA promoted wound healing and were extremely useful for intractable diabetic foot ulcers involving the heel area.
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Affiliation(s)
- Ryuji Higashita
- Department of Cardiovascular Surgery, Wound Care Center, Yokohama General Hospital, Yokohama 225-0025, Japan;
| | | | - Manami Miyazaki
- Department of Cardiovascular Surgery, Wound Care Center, Yokohama General Hospital, Yokohama 225-0025, Japan;
| | - Yoko Yokawa
- Department of Plastic Surgery, Yokohama General Hospital, Yokohama 225-0025, Japan;
| | - Ryosuke Iwai
- Institute of Frontier Science and Technology, Okayama University of Science, Okayama 700-0005, Japan; (R.I.); (M.F.-I.)
| | - Marina Funayama-Iwai
- Institute of Frontier Science and Technology, Okayama University of Science, Okayama 700-0005, Japan; (R.I.); (M.F.-I.)
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Puistola P, Miettinen S, Skottman H, Mörö A. Novel strategy for multi-material 3D bioprinting of human stem cell based corneal stroma with heterogenous design. Mater Today Bio 2024; 24:100924. [PMID: 38226015 PMCID: PMC10788621 DOI: 10.1016/j.mtbio.2023.100924] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2023] [Revised: 12/13/2023] [Accepted: 12/18/2023] [Indexed: 01/17/2024] Open
Abstract
Three-dimensional (3D) bioprinting offers an automated, customizable solution to manufacture highly detailed 3D tissue constructs and holds great promise for regenerative medicine to solve the severe global shortage of donor tissues and organs. However, uni-material 3D bioprinting is not sufficient for manufacturing heterogenous 3D constructs with native-like microstructures and thus, innovative multi-material solutions are required. Here, we developed a novel multi-material 3D bioprinting strategy for bioprinting human corneal stroma. The human cornea is the transparent outer layer of your eye, and vision loss due to corneal blindness has serious effects on the quality of life of individuals. One of the main reasons for corneal blindness is the damage in the detailed organization of the corneal stroma where collagen fibrils are arranged in layers perpendicular to each other and the corneal stromal cells grow along the fibrils. Donor corneas for treating corneal blindness are scarce, and the current tissue engineering (TE) technologies cannot produce artificial corneas with the complex microstructure of native corneal stroma. To address this, we developed a novel multi-material 3D bioprinting strategy to mimic detailed organization of corneal stroma. These multi-material 3D structures with heterogenous design were bioprinted by using human adipose tissue -derived stem cells (hASCs) and hyaluronic acid (HA) -based bioinks with varying stiffnesses. In our novel design of 3D models, acellular stiffer HA-bioink and cell-laden softer HA-bioink were printed in alternating filaments, and the filaments were printed perpendicularly in alternating layers. The multi-material bioprinting strategy was applied for the first time in corneal stroma 3D bioprinting to mimic the native microstructure. As a result, the soft bioink promoted cellular growth and tissue formation of hASCs in the multi-material 3D bioprinted composites, whereas the stiff bioink provided mechanical support as well as guidance of cellular organization upon culture. Interestingly, cellular growth and tissue formation altered the mechanical properties of the bioprinted composite constructs significantly. Importantly, the bioprinted composite structures showed good integration to the host tissue in ex vivo cornea organ culture model. As a conclusion, the developed multi-material bioprinting strategy provides great potential as a biofabrication solution for manufacturing organized, heterogenous microstructures of native tissues. To the best of our knowledge, this multi-material bioprinting strategy has never been applied in corneal bioprinting. Therefore, our work advances the technological achievements in additive manufacturing and brings the field of corneal TE to a new level.
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Affiliation(s)
- Paula Puistola
- Eye Regeneration Group, Faculty of Medicine and Health Technology, Tampere University, Tampere 33520, Finland
| | - Susanna Miettinen
- Adult Stem Cell Group, Faculty of Medicine and Health Technology, Tampere University, Tampere 33520, Finland
- Research, Development and Innovation Centre, Tampere University Hospital, 33520 Tampere, Finland
| | - Heli Skottman
- Eye Regeneration Group, Faculty of Medicine and Health Technology, Tampere University, Tampere 33520, Finland
| | - Anni Mörö
- Eye Regeneration Group, Faculty of Medicine and Health Technology, Tampere University, Tampere 33520, Finland
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Yamamoto S, Matsui K, Kinoshita Y, Hiroshi Sasaki, Sekine H, Saito Y, Nakayama Y, Kume H, Kimura T, Yokoo T, Kobayashi E. Successful reconstruction of the rat ureter by a syngeneic collagen tube with a cardiomyocyte sheet. Regen Ther 2023; 24:561-567. [PMID: 37868722 PMCID: PMC10584669 DOI: 10.1016/j.reth.2023.10.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2023] [Revised: 10/01/2023] [Accepted: 10/05/2023] [Indexed: 10/24/2023] Open
Abstract
Introduction Ureteral injuries require surgical intervention as they lead to loss of renal function. The current reconstructive techniques for long ureteral defects are problematic. Consequently, this study aimed to reconstruct the ureter in a rat model using subcutaneously prepared autologous collagen tubes (Biotubes). Methods The lower ureter of LEW/SsNSlc rats was ligated to dilate the ureter to make anastomosis easier, and reconstruction was performed six days later by anastomosing the dilated ureter and bladder with a Biotube that was prepared subcutaneously in syngeneic rats. Some rats underwent left nephrectomy and ureter reconstruction simultaneously as negative controls to evaluate the effects of urine flow on patency. The other rats were divided into three groups as follows: a group in which the ureter was reconstructed with the Biotube alone, a group in which cardiomyocyte sheets made from the neonatal hearts of syngeneic rats were wrapped around the Biotube, and a group in which an adipose-derived stem cell sheets made from the inguinal fat of adult syngeneic rats were wrapped. Contrast-enhanced computed tomography and pathological evaluations were performed two weeks after reconstruction. Result In the Biotube alone group, all tubes were occluded and hydronephrosis developed, whereas the urothelium regenerated beyond the anastomosis when the left kidney was not removed, suggesting that urothelial epithelial spread occurred with urinary flow. The patency of the ureteral lumen was obtained in some rats in the cardiomyocyte sheet covered group, whereas stricture or obstruction of the reconstructed ureter was observed in all rats in the other groups. Pathological evaluation revealed a layered urothelial structure in the cardiomyocyte sheet covered group, although only a small amount of cardiomyocyte sheets remained. Conclusion Urinary flow may support the epithelial spread of the urothelium into the reconstructed ureter. Neonatal rat cardiomyocyte sheets supported the patency of the regenerated ureter with a layered urothelium.
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Affiliation(s)
- Shutaro Yamamoto
- Department of Urology, The Jikei University School of Medicine, Tokyo 105-8461, Japan
| | - Kenji Matsui
- Division of Nephrology and Hypertension, Department of Internal Medicine, The Jikei University School of Medicine, Tokyo 105-8461, Japan
| | - Yoshitaka Kinoshita
- Division of Nephrology and Hypertension, Department of Internal Medicine, The Jikei University School of Medicine, Tokyo 105-8461, Japan
- Department of Urology, Graduate School of Medicine, The University of Tokyo, Tokyo 113-8654, Japan
| | - Hiroshi Sasaki
- Department of Urology, The Jikei University School of Medicine, Tokyo 105-8461, Japan
| | - Hidekazu Sekine
- Institute of Advanced Biomedical Engineering and Science, Tokyo Women's Medical University, Tokyo 162-8666, Japan
| | - Yatsumu Saito
- Division of Nephrology and Hypertension, Department of Internal Medicine, The Jikei University School of Medicine, Tokyo 105-8461, Japan
| | | | - Haruki Kume
- Department of Urology, Graduate School of Medicine, The University of Tokyo, Tokyo 113-8654, Japan
| | - Takahiro Kimura
- Department of Urology, The Jikei University School of Medicine, Tokyo 105-8461, Japan
| | - Takashi Yokoo
- Division of Nephrology and Hypertension, Department of Internal Medicine, The Jikei University School of Medicine, Tokyo 105-8461, Japan
| | - Eiji Kobayashi
- Department of Kidney Regenerative Medicine, The Jikei University School of Medicine, Tokyo 105-8461, Japan
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Duan L, Wang Z, Fan S, Wang C, Zhang Y. Research progress of biomaterials and innovative technologies in urinary tissue engineering. Front Bioeng Biotechnol 2023; 11:1258666. [PMID: 37645598 PMCID: PMC10461011 DOI: 10.3389/fbioe.2023.1258666] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2023] [Accepted: 08/02/2023] [Indexed: 08/31/2023] Open
Abstract
Substantial interests have been attracted to multiple bioactive and biomimetic biomaterials in recent decades because of their ability in presenting a structural and functional reconstruction of urinary tissues. Some innovative technologies have also been surging in urinary tissue engineering and urological regeneration by providing insights into the physiological behavior of the urinary system. As such, the hierarchical structure and tissue function of the bladder, urethra, and ureter can be reproduced similarly to the native urinary tissues. This review aims to summarize recent advances in functional biomaterials and biomimetic technologies toward urological reconstruction. Various nanofirous biomaterials derived from decellularized natural tissues, synthetic biopolymers, and hybrid scaffolds were developed with desired microstructure, surface chemistry, and mechanical properties. Some growth factors, drugs, as well as inorganic nanomaterials were also utilized to enhance the biological activity and functionality of scaffolds. Notably, it is emphasized that advanced approaches, such as 3D (bio) printing and organoids, have also been developed to facilitate structural and functional regeneration of the urological system. So in this review, we discussed the fabrication strategies, physiochemical properties, and biofunctional modification of regenerative biomaterials and their potential clinical application of fast-evolving technologies. In addition, future prospective and commercial products are further proposed and discussed.
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Affiliation(s)
- Liwei Duan
- The Second Hospital, Jilin University, Changchun, China
| | - Zongliang Wang
- Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, China
| | - Shuang Fan
- The Second Hospital, Jilin University, Changchun, China
| | - Chen Wang
- The Second Hospital, Jilin University, Changchun, China
| | - Yi Zhang
- The Second Hospital, Jilin University, Changchun, China
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Hiwatashi S, Iwai R, Nakayama Y, Moriwaki T, Okuyama H. Successful tracheal regeneration using biofabricated autologous analogues without artificial supports. Sci Rep 2022; 12:20279. [PMID: 36434016 PMCID: PMC9700768 DOI: 10.1038/s41598-022-24798-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2022] [Accepted: 11/21/2022] [Indexed: 11/27/2022] Open
Abstract
Tracheas have a tubular structure consisting of cartilage rings continuously joined by a connective tissue membrane comprising a capillary network for tissue survival. Several tissue engineering efforts have been devoted to the design of scaffolds to produce complex structures. In this study, we successfully fabricated an artificial materials-free autologous tracheal analogue with engraftment ability by combining in vitro cell self-aggregation technique and in-body tissue architecture. The cartilage rings prepared by aggregating chondrocytes on designated culture grooves that induce cell self-aggregation were alternately connected to the connective tissues to form tubular tracheal analogues by subcutaneous embedding as in-body tissue architecture. The tracheal analogues allogeneically implanted into the rat trachea matured into native-like tracheal tissue by covering of luminal surfaces by the ciliated epithelium with mucus-producing goblet cells within eight months after implantation, while maintaining their structural integrity. Such autologous tracheal analogues would provide a foundation for further clinical research on the application of tissue-engineered tracheas to ensure their long-term functionality.
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Affiliation(s)
- Shohei Hiwatashi
- grid.136593.b0000 0004 0373 3971Department of Pediatric Surgery, Osaka University Graduate School of Medicine, Osaka, 565-0871 Japan
| | - Ryosuke Iwai
- grid.444568.f0000 0001 0672 2184Institute of Frontier Science and Technology, Okayama University of Science, Okayama, 700-0005 Japan
| | | | - Takeshi Moriwaki
- grid.257016.70000 0001 0673 6172Faculty of Science and Technology, Hirosaki University, Aomori, 036-8561 Japan
| | - Hiroomi Okuyama
- grid.136593.b0000 0004 0373 3971Department of Pediatric Surgery, Osaka University Graduate School of Medicine, Osaka, 565-0871 Japan
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Mizuno T, Iwai R, Moriwaki T, Nakayama Y. Application of Biosheets as Right Ventricular Outflow Tract Repair Materials in a Rat Model. Front Vet Sci 2022; 9:837319. [PMID: 35464349 PMCID: PMC9024079 DOI: 10.3389/fvets.2022.837319] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2021] [Accepted: 03/17/2022] [Indexed: 11/16/2022] Open
Abstract
Purposes We report the experimental use of completely autologous biomaterials (Biosheets) made by “in-body tissue architecture” that could resolve problems in artificial materials and autologous pericardium. Here, Biosheets were implanted into full-thickness right ventricular outflow tract defects in a rat model. Their feasibility as a reparative material for cardiac defects was evaluated. Methods As the evaluation of mechanical properties of the biosheets, the elastic moduli of the biosheets and RVOT-free walls of rats were examined using a tensile tester. Biosheets and expanded polytetrafluoroethylene sheet were used to repair transmural defects surgically created in the right ventricular outflow tracts of adult rat hearts (n = 9, each patch group). At 4 and 12 weeks after the operation, the hearts were resected and histologically examined. Results The strength and elastic moduli of the biosheets were 421.3 ± 140.7 g and 2919 ± 728.9 kPa, respectively, which were significantly higher than those of the native RVOT-free walls (93.5 ± 26.2 g and 778.6 ± 137.7 kPa, respectively; P < 0.005 and P < 0.001, respectively). All patches were successfully implanted into the right ventricular outflow tract-free wall of rats. Dense fibrous adhesions to the sternum on the epicardial surface were also observed in 7 of 9 rats with ePTFE grafts, whereas 2 of 9 rats with biosheets. Histologically, the vascular-constructing cells were infiltrated into Biosheets. The luminal surfaces were completely endothelialized in all groups at each time point. There was also no accumulation of inflammatory cells. Conclusions Biosheets can be formed easily and have sufficient strength and good biocompatibility as a patch for right ventricular outflow tract repair in rats. Therefore, Biosheet may be a suitable material for reconstructive surgery of the right ventricular outflow tract.
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Affiliation(s)
- Takeshi Mizuno
- Veterinary Medical Center, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo, Japan
- *Correspondence: Takeshi Mizuno
| | - Ryosuke Iwai
- Research Institute of Technology, Okayama University of Science, Okayama, Japan
| | - Takeshi Moriwaki
- Department of Mechanical Science and Engineering, Faculty of Science and Technology, Hirosaki University, Aomori, Japan
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Okamoto K, Umeno T, Shuto T, Wada T, Anai H, Nishida H, Nakayama Y, Miyamoto S. Three-month outcomes of aortic valve reconstruction using collagenous membranes (biosheets) produced by in-body tissue architecture in a goat model: a preliminary study. BMC Cardiovasc Disord 2021; 21:184. [PMID: 33858334 PMCID: PMC8050917 DOI: 10.1186/s12872-021-01988-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2020] [Accepted: 04/07/2021] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Autologous pericardium is widely used as a plastic material in intracardiac structures, in the pulmonary artery, and in aortic valve leaflets. For aortic valve reconstruction (AVRec) using the Ozaki procedure, it has produced excellent clinical results over a 10-year period. In-body tissue architecture (iBTA), which is based on the phenomenon of tissue encapsulation of foreign materials, can be used to prepare autologous prosthetic tissues. In this preliminary study, we examined whether biosheets can be used as valve leaflet material for glutaraldehyde-free AVRec by subchronic implantation experiments in goats and evaluated its performance compared with glutaraldehyde-treated autologous pericardium for AVRec. METHODS Biosheets were prepared by embedding molds for two months into the dorsal subcutaneous spaces of goats. Autogenic biosheets (n = 4) cut into the shape of the valve were then implanted to the aortic valve annulus of four goats for three months without glutaraldehyde treatment. Autologous pericardium (n = 4) was used in four goats as a control. Valve function was observed using echocardiography. RESULTS All goats survived the three-month study period. With biosheets, the leaflet surfaces were very smooth and, on histology, partially covered with a thin neointima (including endothelial cells). Biosheets were more thoroughly assimilated into the aortic root compared with autologous pericardium. CONCLUSIONS For the first time, biosheets were used for large animal AVRec. Biosheets could function as leaflets in the aortic position and may have the ability to assimilate into native valves.
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Affiliation(s)
- Keitaro Okamoto
- Department of Cardiovascular Surgery, Faculty of Medicine, Oita University, 1-1 Idaigaoka, Yufu , Oita , 879-5593, Japan. .,Department of Cardiovascular Surgery, Oita University Hospital, Oita, Japan.
| | - Tadashi Umeno
- Department of Cardiovascular Surgery, Oita University Hospital, Oita, Japan
| | - Takashi Shuto
- Department of Cardiovascular Surgery, Oita University Hospital, Oita, Japan
| | - Tomoyuki Wada
- Department of Cardiovascular Surgery, Oita University Hospital, Oita, Japan
| | - Hirofumi Anai
- Clinical Engineering, Faculty of Medicine, Oita University, Yufu, Oita, Japan
| | - Haruto Nishida
- Department of Pathology, Oita University Hospital, Oita, Japan
| | | | - Shinji Miyamoto
- Department of Cardiovascular Surgery, Oita University Hospital, Oita, Japan
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Kawashima T, Umeno T, Terazawa T, Wada T, Shuto T, Nishida H, Anai H, Nakayama Y, Miyamoto S. Aortic valve neocuspidization with in-body tissue-engineered autologous membranes: preliminary results in a long-term goat model. Interact Cardiovasc Thorac Surg 2021; 32:969-977. [PMID: 33543242 DOI: 10.1093/icvts/ivab015] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2020] [Revised: 12/03/2020] [Accepted: 12/20/2020] [Indexed: 01/19/2023] Open
Abstract
OBJECTIVES Aortic valve neocuspidization has shown satisfactory clinical outcomes; however, autologous pericardium durability is a concern for young patients. This study applied an autologous collagenous membrane (Biosheet®), produced by in-body tissue architecture, to aortic valve neocuspidization and investigated its long-term outcome in a goat model. METHODS Moulds were embedded subcutaneously in 6 goats. After 2 months, Biosheets formed in the moulds. We performed aortic valve neocuspidization using a portion of the sheets with a thickness of 0.20-0.35 mm, measured by optical coherence tomography. Animals were subjected to echocardiography and histological evaluation at 6 months (n = 3) and 12 months (n = 3). As a control, the glutaraldehyde-treated autologous pericardium was used in 4 goats that were similarly evaluated at 12 months. RESULTS All animals survived the scheduled period. At 6 months, Biosheets maintained valve function and showed a regeneration response: fusion to the annulus, cell infiltration to the leaflets and appearance of elastic fibres at the ventricular side. After 12 months, the regenerative structure had changed little without regression, and there was negligible calcification in the 1/9 leaflets. However, all cases had one leaflet tear, resulting in moderate-to-severe aortic regurgitation. In the pericardium group, three-fourths of the animals experienced moderate-to-severe aortic regurgitation with a high rate of calcification (9/12 leaflets). CONCLUSIONS Biosheets may have regeneration potential and anti-calcification properties in contrast to autologous pericardium. However, in order to obtain reliable outcome, further improvements are required to strictly control and optimize its thickness, density and homogeneity.
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Affiliation(s)
- Takayuki Kawashima
- Department of Cardiovascular Surgery, Oita University, Yufu, Oita, Japan
| | - Tadashi Umeno
- Department of Cardiovascular Surgery, Oita University, Yufu, Oita, Japan
| | - Takeshi Terazawa
- Department of Mechanical Systems Engineering, Aichi University of Technology, Gamagori, Aichi, Japan
| | - Tomoyuki Wada
- Department of Cardiovascular Surgery, Oita University, Yufu, Oita, Japan
| | - Takashi Shuto
- Department of Cardiovascular Surgery, Oita University, Yufu, Oita, Japan
| | - Haruto Nishida
- Department of Diagnostic Pathology, Oita University, Yufu, Oita, Japan
| | - Hirofumi Anai
- Clinical Engineering Research Center, Oita University, Yufu, Oita, Japan
| | | | - Shinji Miyamoto
- Department of Cardiovascular Surgery, Oita University, Yufu, Oita, Japan
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Iimori Y, Iwai R, Nagatani K, Inoue Y, Funayama-Iwai M, Okamoto M, Nakata M, Mie K, Nishida H, Nakayama Y, Akiyoshi H. Urinary bladder reconstruction using autologous collagenous connective tissue membrane "Biosheet®" induced by in-body tissue architecture: A pilot study. Regen Ther 2020; 15:274-280. [PMID: 33426229 PMCID: PMC7770416 DOI: 10.1016/j.reth.2020.10.006] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2020] [Revised: 10/15/2020] [Accepted: 10/29/2020] [Indexed: 11/20/2022] Open
Abstract
INTRODUCTION In-body tissue architecture (iBTA) technology, based on cell-free tissue engineering, can produces collagenous tissues for implantation by subcutaneous embedding a designed mold. The aim of this study was to evaluate the biocompatibility of iBTA-induced "Biosheet®" collagenous sheets, as scaffold materials for bladder reconstruction. METHODS Canine Biosheet® implants were prepared by embedding molds into subcutaneous pouches in beagles for 8 weeks. A part of canine bladder wall was excised (2 × 2 cm) and repaired by patching the same sized autologous Biosheet®. The Biosheet® implants were harvested 4 weeks (n = 1) and 12 weeks (n = 3) after the implantation and evaluated histologically. RESULTS No disruption of the patched Biosheet® implants or urinary leakage into the peritoneal cavity was observed during the entire observation periods. There were no signs of chronic inflammation or Biosheet® rejection. The urine-contacting surface of luminal surface of the Biosheet® was covered with a multicellular layer of urothelium cells 4 weeks after implantation. α-SMA-positive muscle cells were observed at the margin of the Biosheet® implants at 12 weeks after the implantation. In addition, in the center of the Biosheet® implants, the formation of microvessels stained as α-SMA-positive was observed. CONCLUSION Biosheet® implants have biocompatibility as a scaffold for bladder reconstruction, indicating that they may be applicable for full-thickness bladder wall substitution. Further studies are required for definitive evaluation as a scaffold for bladder reconstruction.
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Affiliation(s)
- Yasumasa Iimori
- Laboratory of Veterinary Surgery, Graduate School of Life and Environmental Sciences, Osaka Prefecture University, 1-58 Rinku-oraikita, Izumisano-shi, Osaka 598-8531, Japan
| | - Ryosuke Iwai
- Research Institute of Technology, Okayama University of Science, 1-1 Ridaicho, Kita-ku, Okayama, 700-0005, Japan
| | - Kengo Nagatani
- Laboratory of Veterinary Surgery, Graduate School of Life and Environmental Sciences, Osaka Prefecture University, 1-58 Rinku-oraikita, Izumisano-shi, Osaka 598-8531, Japan
| | - Yuka Inoue
- Laboratory of Veterinary Surgery, Graduate School of Life and Environmental Sciences, Osaka Prefecture University, 1-58 Rinku-oraikita, Izumisano-shi, Osaka 598-8531, Japan
| | - Marina Funayama-Iwai
- Laboratory of Veterinary Surgery, Graduate School of Life and Environmental Sciences, Osaka Prefecture University, 1-58 Rinku-oraikita, Izumisano-shi, Osaka 598-8531, Japan
| | - Mari Okamoto
- Laboratory of Veterinary Surgery, Graduate School of Life and Environmental Sciences, Osaka Prefecture University, 1-58 Rinku-oraikita, Izumisano-shi, Osaka 598-8531, Japan
| | - Mio Nakata
- Laboratory of Veterinary Surgery, Graduate School of Life and Environmental Sciences, Osaka Prefecture University, 1-58 Rinku-oraikita, Izumisano-shi, Osaka 598-8531, Japan
| | - Keiichiro Mie
- Laboratory of Veterinary Surgery, Graduate School of Life and Environmental Sciences, Osaka Prefecture University, 1-58 Rinku-oraikita, Izumisano-shi, Osaka 598-8531, Japan
| | - Hidetaka Nishida
- Laboratory of Veterinary Surgery, Graduate School of Life and Environmental Sciences, Osaka Prefecture University, 1-58 Rinku-oraikita, Izumisano-shi, Osaka 598-8531, Japan
| | | | - Hideo Akiyoshi
- Laboratory of Veterinary Surgery, Graduate School of Life and Environmental Sciences, Osaka Prefecture University, 1-58 Rinku-oraikita, Izumisano-shi, Osaka 598-8531, Japan
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Mechanical characterization of an in-body tissue-engineered autologous collagenous sheet for application as an aortic valve reconstruction material. J Biomech 2020; 99:109528. [DOI: 10.1016/j.jbiomech.2019.109528] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2019] [Revised: 10/12/2019] [Accepted: 11/05/2019] [Indexed: 11/22/2022]
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Komura M, Komura H, Satake R, Suzuki K, Yonekawa H, Ikebukuro K, Komuro H, Hoshi K, Takato T, Moriwaki T, Nakayama Y. Fabrication of an anatomy-mimicking BIO-AIR-TUBE with engineered cartilage. Regen Ther 2019; 11:176-181. [PMID: 31453272 PMCID: PMC6700413 DOI: 10.1016/j.reth.2019.07.004] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2019] [Revised: 07/02/2019] [Accepted: 07/17/2019] [Indexed: 12/03/2022] Open
Abstract
Introduction We devised a strategy for the fabrication of an ‘anatomy-mimicking’ cylinder-type engineered trachea combined with cartilage engineering. The engineered BIOTUBEs are used to support the architecture of the body tissue, for long-segment trachea (>5 cm) with carinal reconstruction. The aim of the present study was to fabricate an anatomy-mimicking cylinder-type regenerative airway, and investigate its applicability in a rabbit model. Methods Collagen sponge rings (diameter: 6 mm) were arranged on a silicon tube (diameter: 6 mm) at 2-mm intervals. Chondrocytes from the auricular cartilage were seeded onto collagen sponges immediately prior to implantation in an autologous manner. These constructs were embedded in dorsal subcutaneous pouches of rabbits. One month after implantation, the constructs were retrieved for histological examination. In addition, cervical tracheal sleeve resection was performed, and these engineered constructs were implanted into defective airways through end-to-end anastomosis. Results One month after implantation, the engineered constructs exhibited similar rigidity and flexibility to those observed with the native trachea. Through histological examination, the constructs showed an anatomy-mimicking tracheal architecture. In addition, the engineered constructs could be anastomosed to the native trachea without air leakage. Conclusion The present study provides the possibility of generating anatomy-mimicking cylinder-type airways, termed BIO-AIR-TUBEs, that engineer cartilage in an in-vivo culture system. This approach involves the use of BIOTUBEs formed via in-body tissue architecture technology. Therefore, the BIO-AIR-TUBE may be useful as the basic architecture of artificial airways.
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Affiliation(s)
- Makoto Komura
- Department of Pediatric Surgery, Graduate School of Medicine, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8655, Japan.,Department of Pediatric Surgery, Saitama Medical University, 38 Morohongo, Moroyama-cho, Iruma-gun, Saitama 350-0495, Japan
| | - Hiroko Komura
- Department of Pediatric Surgery, Graduate School of Medicine, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8655, Japan
| | - Ryosuke Satake
- Department of Pediatric Surgery, Saitama Medical University, 38 Morohongo, Moroyama-cho, Iruma-gun, Saitama 350-0495, Japan
| | - Keisuke Suzuki
- Department of Pediatric Surgery, Saitama Medical University, 38 Morohongo, Moroyama-cho, Iruma-gun, Saitama 350-0495, Japan
| | - Hironobu Yonekawa
- Department of Pediatric Surgery, Saitama Medical University, 38 Morohongo, Moroyama-cho, Iruma-gun, Saitama 350-0495, Japan
| | - Kenichi Ikebukuro
- Department of Pediatric Surgery, Saitama Medical University, 38 Morohongo, Moroyama-cho, Iruma-gun, Saitama 350-0495, Japan
| | - Hiroaki Komuro
- Department of Pediatric Surgery, Saitama Medical University, 38 Morohongo, Moroyama-cho, Iruma-gun, Saitama 350-0495, Japan
| | - Kazuto Hoshi
- Department of Tissue Engineering, Tokyo University Hospital, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8655, Japan
| | - Tsuyoshi Takato
- Department of Tissue Engineering, Tokyo University Hospital, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8655, Japan
| | - Takeshi Moriwaki
- Department of Biomedical Engineering, National Cerebral and Cardiovascular Center, 5-7-1 Fujishiro-dai, Suita, Osaka 565-8565, Japan
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Long-term outcomes of patch tracheoplasty using collagenous tissue membranes (biosheets) produced by in-body tissue architecture in a beagle model. Surg Today 2019; 49:958-964. [PMID: 31098758 DOI: 10.1007/s00595-019-01818-5] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2018] [Accepted: 04/18/2019] [Indexed: 12/31/2022]
Abstract
PURPOSE Although various artificial tracheas have been developed, none have proven satisfactory for clinical use. In-body tissue architecture (IBTA) has enabled us to produce collagenous tissues with a wide range of shapes and sizes to meet the needs of individual recipients. In the present study, we investigated the long-term outcomes of patch tracheoplasty using an IBTA-induced collagenous tissue membrane ("biosheet") in a beagle model. METHODS Nine adult female beagles were used. Biosheets were prepared by embedding cylindrical molds assembled with a silicone rod and a slitting pipe into dorsal subcutaneous pouches for 2 months. The sheets were then implanted by patch tracheoplasty. An endoscopic evaluation was performed after 1, 3, or 12 months. The implanted biosheets were harvested for a histological evaluation at the same time points. RESULTS All animals survived the study. At 1 month after tracheoplasty, the anastomotic parts and internal surface of the biosheets were smooth with ciliated columnar epithelium, which regenerated into the internal surface of the biosheet. The chronological spread of chondrocytes into the biosheet was observed at 3 and 12 months. CONCLUSIONS Biosheets showed excellent performance as a scaffold for trachea regeneration with complete luminal epithelium and partial chondrocytes in a 1-year beagle implantation model of patch tracheoplasty.
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Terazawa T, Furukoshi M, Nakayama Y. One-year follow-up study of iBTA-induced allogenic biosheet for repair of abdominal wall defects in a beagle model: a pilot study. Hernia 2018; 23:149-155. [PMID: 30506241 DOI: 10.1007/s10029-018-1866-1] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2018] [Accepted: 11/25/2018] [Indexed: 11/30/2022]
Abstract
PURPOSE We evaluated the usefulness of biosheet, an in-body tissue-engineered collagenous membrane, as a novel repair material for abdominal wall defects in a beagle model. METHODS Biosheets were prepared by embedding molds into subcutaneous pouches in two beagle dogs for 2 months, with subsequent storage in 70% ethanol. The obtained biosheets (thickness 0.5 mm, size 25 cm2) were implanted to replace same-size defects in the abdominal wall of two beagles in an allogenic manner. RESULTS The biosheets were not stressed during suturing and did not split; moreover, patch implantation into the defective wound was easy. No complications such as anastomotic leaks or infections occurred during implantation. One year post-implantation, the thickness of the biosheet implantation section increased to approximately 2.5 mm, corresponding to approximately 70% of the native abdominal wall. A section of the abdominal wall muscle elongated from the periphery of the newly formed collagen layer, and the peritoneum was entirely formed on the peritoneal cavity surface, resulting in partial regeneration of the three-layered abdominal wall. The mechanical strength of the newly formed wall was approximately fivefold higher than the native wall. The elasticity of the biosheet in the low-strain region decreased to approximately 10% post-implantation, similar to the native wall. CONCLUSIONS This pilot study demonstrated that biosheet maintained the abdominal wall without any complications for 1 year post-implantation, and partial regeneration was observed. Although this experiment was limited to two cases, the results indicated that biosheet may serve as a reliable abdominal wall restorative material.
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Affiliation(s)
- T Terazawa
- Department of Regenerative Medicine and Tissue Engineering, National Cerebral and Cardiovascular Center Research Institute, 5-7-1, Fujishirodai, Suita, Osaka, 565-8565, Japan.,Division of Cell Engineering, Graduate School of Chemical Science and Engineering, Hokkaido University, Kita 13 Nishi 8, Kita-ku, Sapporo, Hokkaido, 060-8628, Japan.,Biotube Co., Ltd, 2-13-11 Shinkawa, Chuo, Tokyo, 104-0033, Japan
| | - M Furukoshi
- Department of Regenerative Medicine and Tissue Engineering, National Cerebral and Cardiovascular Center Research Institute, 5-7-1, Fujishirodai, Suita, Osaka, 565-8565, Japan.,Division of Cell Engineering, Graduate School of Chemical Science and Engineering, Hokkaido University, Kita 13 Nishi 8, Kita-ku, Sapporo, Hokkaido, 060-8628, Japan
| | - Y Nakayama
- Biotube Co., Ltd, 2-13-11 Shinkawa, Chuo, Tokyo, 104-0033, Japan.
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iBTA-induced bovine Biosheet for repair of abdominal wall defects in a beagle model: proof of concept. Hernia 2018; 22:1033-1039. [PMID: 30022282 DOI: 10.1007/s10029-018-1799-8] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2018] [Accepted: 07/13/2018] [Indexed: 12/21/2022]
Abstract
INTRODUCTION We evaluated the usefulness of xeno-Biosheets, an in-body tissue architecture-induced bovine collagenous sheet, as repair materials for abdominal wall defects in a beagle model. MATERIALS AND METHODS Biosheets were prepared by embedding cylindrical molds into subcutaneous pouches of three Holstein cows for 2-3 months and stored in 70% ethanol. The Biosheets were 0.5 mm thick, cut into 2 cm × 2 cm, and implanted to replace defects of the same size in the abdominal wall of nine beagles. The abdominal wall and Biosheets were harvested and subjected to histological evaluation at 1, 3, and 5 months after implantation (n = 3 each). RESULTS The Biosheet and bovine pericardiac patch (control) were not stressed during the suture operation and did not split, and patches were easily implanted on defective wounds. After implantation, the patch did not fall off and was not perforated, and healing was observed nacroscopically in all cases. During the first month of implantation, accumulation of inflammatory cells was observed along with decomposition around the Biosheet. Decomposition was almost complete after 3 months, and the Biosheet was replaced by autologous collagenous connective tissue without rejection. After 5 months, the abdominal wall muscle elongated from the periphery of the newly formed collagen layer and the peritoneum was formed on the peritoneal cavity surface. Regeneration of almost all layers of the abdominal wall was observed. However, almost all pericardium patches were remained even at 5 months with inflammation. CONCLUSION Bovine Biosheets requiring no special post-treatment can be useful as off-the-shelf materials for abdominal wall repair.
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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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Suzuki K, Komura M, Terawaki K, Kodaka T, Gohara T, Komura H, Nakayama Y. Engineering and repair of diaphragm using biosheet (a collagenous connective tissue membrane) in rabbits. J Pediatr Surg 2018; 53:330-334. [PMID: 29241962 DOI: 10.1016/j.jpedsurg.2017.11.035] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/26/2017] [Accepted: 11/08/2017] [Indexed: 11/19/2022]
Abstract
BACKGROUND Prosthetic patches can be used to repair large congenital diaphragmatic hernia defects but may be associated with infection, recurrence, and thoracic deformity. Biosheets (collagenous connective tissue membranes) have been used in regenerative medicine. We evaluated the efficacy of Biosheets in a rabbit model. METHODS Biosheets were prepared by embedding silicone plates in dorsal subcutaneous pouches of rabbits for 4weeks. In group 1 (n=11), Gore-Tex® sheets (1.8×1.8cm) were implanted into a diaphragmatic defect. In group 2 (n=11), Seamdura®, a bioabsorbable artificial dural substitute, was implanted in the same manner. In group 3 (n=14), biosheets were autologously transplanted into the diaphragmatic defects. All rabbits were euthanized 3months after transplantation to evaluate their graft status. RESULTS Herniation of liver was observed in 5 rabbits (45%) in group 1, 8 (73%) in group 2, and 3 (21%) in group 3. A significant difference was noted between groups 2 and 3 (P=0.017). Biosheets had equivalent burst strength and modulus of elasticity as native diaphragm. Muscular tissue regeneration in transplanted biosheets in group 3 was confirmed histologically. CONCLUSION Biosheets may be applied to diaphragmatic repair and replacement of diaphragmatic muscular tissue. LEVEL OF EVIDENCE Level III.
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Affiliation(s)
- Keisuke Suzuki
- Department of Pediatric Surgery, Saitama Medical University, Saitama, Japan
| | - Makoto Komura
- Department of Pediatric Surgery, Saitama Medical University, Saitama, Japan.
| | - Kan Terawaki
- Department of Pediatric Surgery, Saitama Medical University, Saitama, Japan
| | - Tetsuro Kodaka
- Department of Pediatric Surgery, Saitama Medical University, Saitama, Japan
| | - Takumi Gohara
- Department of Pediatric Surgery, Saitama Medical University, Saitama, Japan
| | - Hiroko Komura
- Division of Tissue Engineering, Graduate School of Medicine, University of Tokyo, Tokyo, Japan
| | - Yasuhide Nakayama
- Division of Medical Engineering and Materials, National Cerebral and Cardiovascular Centre Research Institute, Osaka, Japan
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Zhou HY, Cao Y, Wu J, Zhang WS. Role of corneal collagen fibrils in corneal disorders and related pathological conditions. Int J Ophthalmol 2017; 10:803-811. [PMID: 28546941 DOI: 10.18240/ijo.2017.05.24] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2016] [Accepted: 03/23/2017] [Indexed: 01/24/2023] Open
Abstract
The cornea is a soft tissue located at the front of the eye with the principal function of transmitting and refracting light rays to precisely sense visual information. Corneal shape, refraction, and stromal stiffness are to a large part determined by corneal fibrils, the arrangements of which define the corneal cells and their functional behaviour. However, the modality and alignment of native corneal collagen lamellae are altered in various corneal pathological states such as infection, injury, keratoconus, corneal scar formation, and keratoprosthesis. Furthermore, corneal recuperation after corneal pathological change is dependent on the balance of corneal collagen degradation and contraction. A thorough understanding of the characteristics of corneal collagen is thus necessary to develop viable therapies using the outcome of strategies using engineered corneas. In this review, we discuss the composition and distribution of corneal collagens as well as their degradation and contraction, and address the current status of corneal tissue engineering and the progress of corneal cross-linking.
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Affiliation(s)
- Hong-Yan Zhou
- Department of Ophthalmology, China-Japan Union Hospital of Jilin University, Changchun 130033, Jilin Province, China
| | - Yan Cao
- Department of Ophthalmology, China-Japan Union Hospital of Jilin University, Changchun 130033, Jilin Province, China
| | - Jie Wu
- Department of Ophthalmology, China-Japan Union Hospital of Jilin University, Changchun 130033, Jilin Province, China
| | - Wen-Song Zhang
- Department of Ophthalmology, the Second Hospital of Jilin University, Changchun 130000, Jilin Province, China
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Gurumurthy B, Bierdeman PC, Janorkar AV. Spheroid model for functional osteogenic evaluation of human adipose derived stem cells. J Biomed Mater Res A 2017; 105:1230-1236. [PMID: 27943608 DOI: 10.1002/jbm.a.35974] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2016] [Accepted: 11/16/2016] [Indexed: 12/17/2022]
Abstract
3D culture systems have the ability to mimic the natural microenvironment by allowing better cell-cell interactions. We have prepared an in vitro 3D osteogenic cell culture model using human adipose derived stem cells (hASCs) cultured atop recombinant elastin-like polypeptide (ELP) conjugated to a charged polyelectrolyte, polyethyleneimine (PEI). We demonstrate that hASCs cultured atop the ELP-PEI coated tissue culture polystyrene (TCPS) formed 3D spheroids and exhibited superior differentiation toward osteogenic lineage compared to the traditional two dimensional (2D) monolayer formed atop uncoated TCPS. Live/dead viability assay confirmed >90% live cells at the end of the 3-week culture period. Over the same culture period, higher protein content was observed in 2D monolayer than 3D spheroids, as the 2D environment allowed continued proliferation, while 3D spheroids underwent contact-inhibited growth arrest. The normalized alkaline phosphatase (ALP) activity, which is an indicator for early osteogenic differentiation was higher for 3D spheroids. The normalized osteocalcin (OCN) production, which is an indicator for osteogenic maturation was also higher for 3D spheroids while 2D monolayer had no noticeable OCN production. On day 22, increased Alizarin red uptake by 3D spheroids showed greater mineralization activity than 2D monolayer. Taken together, these results indicate a superior osteogenic differentiation of hASCs in 3D spheroid culture atop ELP-PEI coated TCPS surfaces than the 2D monolayer formed on uncoated TCPS surfaces. Such enhanced osteogenesis in 3D spheroid stem cell culture may serve as an alternative to 2D culture by providing a better microenvironment for the enhanced cellular functions and interactions in bone tissue engineering. © 2017 Wiley Periodicals, Inc. J Biomed Mater Res Part A: 105A: 1230-1236, 2017.
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Affiliation(s)
- Bhuvaneswari Gurumurthy
- Department of Biomedical Materials Science, School of Dentistry, University of Mississippi Medical Center, Jackson, Mississippi, 39216
| | - Patrick C Bierdeman
- Department of Biomedical Materials Science, School of Dentistry, University of Mississippi Medical Center, Jackson, Mississippi, 39216
| | - Amol V Janorkar
- Department of Biomedical Materials Science, School of Dentistry, University of Mississippi Medical Center, Jackson, Mississippi, 39216
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Patch tracheoplasty in body tissue engineering using collagenous connective tissue membranes (biosheets). J Pediatr Surg 2016; 51:244-8. [PMID: 26628203 DOI: 10.1016/j.jpedsurg.2015.10.068] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/21/2015] [Accepted: 10/30/2015] [Indexed: 11/23/2022]
Abstract
BACKGROUND Collagenous connective tissue membranes (biosheets) are useful for engineering cardiovascular tissue in tissue engineering. The aim was to evaluate the use of biosheets as a potential tracheal substitute material in vivo in a rabbit model. METHODS Group 1: Rectangular-shaped Gore-Tex (4×7mm) was implanted into a 3×6mm defect created in the midventral portion of the cervical trachea. Group 2: Rectangular-shaped dermis was implanted into a tracheotomy of similar size. Group 3: Biosheets were prepared by embedding silicone moulds in dorsal subcutaneous pouches in rabbits for 1month. Rectangular-shaped biosheets were implanted into a tracheotomy of similar size in an autologous fashion. All groups (each containing 10 animals) were sacrificed 4weeks after implantation. MAIN RESULTS All materials maintained airway structure for up to 4weeks after implantation. Regenerative cartilage in implanted Biosheets in group 3 was confirmed by histological analysis. Tracheal epithelial regeneration occurred in the internal lumen of group 3. There were significant differences in the amounts of collagen type II and glycosaminoglycan between group 3 and group 1 or 2. CONCLUSION We confirm that cartilage can self-regenerate onto an airway patch using Biosheets.
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Iwai R, Nemoto Y, Nakayama Y. Preparation and characterization of directed, one-day-self-assembled millimeter-size spheroids of adipose-derived mesenchymal stem cells. J Biomed Mater Res A 2015; 104:305-12. [PMID: 26386244 DOI: 10.1002/jbm.a.35568] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2015] [Revised: 09/14/2015] [Accepted: 09/17/2015] [Indexed: 12/11/2022]
Abstract
Three-dimensional cell spheroids prepared without using any artificial scaffold materials are desirable for cell-based transplants. However, conventional cell culture systems are inefficient for rapid, large-scale and non-cytotoxic generation of size-controlled spheroids (>1 mm diameter) that are required for tissue regenerative therapy application. In this study, we prepared millimeter-order spheroids of adipose-derived mesenchymal stem cells (ADSCs) by controlling the spheroid size (diameter range: 0.4-2.5 mm). Notably, spheroid generation required only one day of culture on charged culture dishes. Almost all spheroid-derived ADSCs were viable and produced adhesion molecules and growth factors, which play an important role in tissue regeneration. Moreover, spheroid-derived ADSCs could infiltrate and recellularize collagenous tissue membranes in vitro. The ADSC spheroids developed in this study could be directly (without additional processing) used for cell-based tissue regeneration therapy. Furthermore, the rapid scale-up process and noncytotoxic generation of spheroids would also enable other applications such as use as screening models for drug discovery.
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Affiliation(s)
- Ryosuke Iwai
- Division of Medical Engineering and Materials, National Cerebral and Cardiovascular Center Research Institute, Osaka, Japan
| | - Yasushi Nemoto
- Development Department, Chemical Products Division, Bridgestone, Co, Yokohama, Japan
| | - Yasuhide Nakayama
- Division of Medical Engineering and Materials, National Cerebral and Cardiovascular Center Research Institute, Osaka, Japan
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Nakayama Y, Kaneko Y, Takewa Y, Okumura N. Mechanical properties of human autologous tubular connective tissues (human biotubes) obtained from patients undergoing peritoneal dialysis. J Biomed Mater Res B Appl Biomater 2015; 104:1431-7. [PMID: 26227350 DOI: 10.1002/jbm.b.33495] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2015] [Revised: 07/04/2015] [Accepted: 07/18/2015] [Indexed: 01/02/2023]
Abstract
Completely autologous in vivo tissue-engineered connective tissue tubes (Biotubes) have promise as arterial vascular grafts in animal implantation studies. In this clinical study of patients undergoing peritoneal dialysis (PD) (n = 11; age: 39-83 years), we evaluated human Biotubes' (h-Biotubes) mechanical properties to determine whether Biotubes with feasibility as vascular grafts could be formed in human bodies. We extracted PD catheters, embedded for 4-47 months, and obtained tubular connective tissues as h-Biotubes (internal diameter: 5 mm) from around the catheter' silicone tubular parts. h-Biotubes were composed mainly of collagen with smooth luminal surfaces. The average wall thickness was 278 ± 178 μm. No relationship was founded between the tubes' mechanical properties and patients' ages or PD catheter embedding periods statistically. However, the elastic modulus (2459 ± 970 kPa) and tensile strength (623 ± 314 g) of h-Biotubes were more than twice as great as those from animal Biotubes, formed from the same PD catheters by embedding in the beagle subcutaneous pouches for 1 month, or beagle arteries. The burst strength (6338 ± 1106 mmHg) of h-Biotubes was almost the same as that of the beagle thoracic or abdominal aorta. h-Biotubes could be formed in humans over a 4-month embedding period, and they satisfied the mechanical requirements for application as vascular grafts. © 2015 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 104B: 1431-1437, 2016.
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Affiliation(s)
- Yasuhide Nakayama
- Division of Medical Engineering and Materials, National Cerebral and Cardiovascular Center Research Institute, Osaka, Japan.
| | | | - Yoshiaki Takewa
- Department of Artificial Organs, National Cerebral and Cardiovascular Center Research Institute, Osaka, Japan
| | - Noriko Okumura
- Department of Kidney and Dialysis, Tenri Hospital, Nara, Japan
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