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Tajikawa T, Sekido Y, Mori K, Kawashima T, Nakashima Y, Miyamoto S, Nakayama Y. Diverse Shape Design and Physical Property Evaluation of In-Body Tissue Architecture-Induced Tissues. Bioengineering (Basel) 2024; 11:598. [PMID: 38927834 PMCID: PMC11200934 DOI: 10.3390/bioengineering11060598] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2024] [Revised: 06/01/2024] [Accepted: 06/06/2024] [Indexed: 06/28/2024] Open
Abstract
Autologous-engineered artificial tissues constitute an ideal alternative for radical surgery in terms of natural anticoagulation, self-repair, tissue regeneration, and the possibility of growth. Previously, we focused on the development and practical application of artificial tissues using "in-body tissue architecture (iBTA)", a technique that uses living bodies as bioreactors. This study aimed to further develop iBTA by fabricating tissues with diverse shapes and evaluating their physical properties. Although the breaking strength increased with tissue thickness, the nominal breaking stress increased with thinner tissues. By carving narrow grooves on the outer periphery of an inner core with narrow grooves, we fabricated approximately 2.2 m long cord-shaped tissues and net-shaped tissues with various designs. By assembling the two inner cores inside the branched stainless-steel pipes, a large graft with branching was successfully fabricated, and its aortic arch replacement was conducted in a donor goat without causing damage. In conclusion, by applying iBTA technology, we have made it possible, for the first time, to create tissues of various shapes and designs that are difficult using existing tissue-engineering techniques. Thicker iBTA-induced tissues exhibited higher rupture strength; however, rupture stress was inversely proportional to thickness. These findings broaden the range of iBTA-induced tissue applications.
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Affiliation(s)
- Tsutomu Tajikawa
- Department of Mechanical Engineering, Faculty of Engineering Science, Kansai University, Osaka 564-8680, Japan
| | - Yota Sekido
- Graduate School of Science and Engineering, Kansai University, Osaka 564-8680, Japan;
| | - Kazuki Mori
- Department of Cardiovascular Surgery, Oita University Hospital, Oita 879-5593, Japan; (K.M.); (T.K.); (Y.N.); (S.M.)
| | - Takayuki Kawashima
- Department of Cardiovascular Surgery, Oita University Hospital, Oita 879-5593, Japan; (K.M.); (T.K.); (Y.N.); (S.M.)
| | - Yumiko Nakashima
- Department of Cardiovascular Surgery, Oita University Hospital, Oita 879-5593, Japan; (K.M.); (T.K.); (Y.N.); (S.M.)
| | - Shinji Miyamoto
- Department of Cardiovascular Surgery, Oita University Hospital, Oita 879-5593, Japan; (K.M.); (T.K.); (Y.N.); (S.M.)
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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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Tardalkar KR, Marsale TB, Bhamare NC, Kshersagar JR, Patil JK, Adnaik A, Joshi MG. Heparin coated decellularized xenogeneic small diameter vascular conduit for vascular repair with early luminal reendothelialization. Cell Tissue Bank 2022; 24:449-469. [DOI: 10.1007/s10561-022-10046-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2021] [Accepted: 10/23/2022] [Indexed: 11/09/2022]
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Higashita R, Miyazaki M, Oi M, Ishikawa N. First-in-human results of an in-body tissue architecture-induced tissue-engineered vascular graft “Biotube” for application in distal bypass for chronic limb-threatening ischemia. J Vasc Surg Cases Innov Tech 2022; 8:488-493. [PMID: 36052213 PMCID: PMC9424347 DOI: 10.1016/j.jvscit.2022.07.007] [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: 04/25/2022] [Accepted: 07/08/2022] [Indexed: 11/24/2022] Open
Abstract
Small-diameter vascular substitutes remain necessary, especially in the absence of an available autologous vein. Using a completely autologous approach termed “in-body tissue architecture,” a small-diameter, long, tissue-engineered vascular graft, a “Biotube,” was developed. A below-the-knee distal bypass using the Biotube as a composite with expanded polytetrafluoroethylene grafts was performed to treat a patient with chronic limb-threatening ischemia without a venous graft available. The wound on the foot had completely healed 3 months after the bypass surgery, and limb salvage and walking without claudication were achieved. At the 1-year postoperative follow-up examination, duplex ultrasound scans demonstrated graft patency without thrombus or stenosis.
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Nakayama Y, Iwai R, Terazawa T, Tajikawa T, Umeno T, Kawashima T, Nakashima Y, Shiraishi Y, Yamada A, Higashita R, Miyazaki M, Oie T, Kadota S, Yabuuchi N, Abe F, Funayama-Iwai M, Yambe T, Miyamoto S. Pre-implantation evaluation of a small-diameter, long vascular graft (Biotube®) for below-knee bypass surgery in goats. J Biomed Mater Res B Appl Biomater 2022; 110:2387-2398. [PMID: 35561095 DOI: 10.1002/jbm.b.35084] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2022] [Revised: 04/28/2022] [Accepted: 04/30/2022] [Indexed: 11/06/2022]
Abstract
There are no small-diameter, long artificial vascular grafts for below-knee bypass surgery in chronic limb-threatening ischemia. We have developed tissue-engineered vascular grafts called "Biotubes®" using a completely autologous approach called in-body tissue architecture (iBTA). This study aimed at pre-implantation evaluation of Biotube and its in vivo preparation device, Biotube Maker, for use in below-knee bypass surgery. Forty nine makers were subcutaneously embedded into 17 goats for predetermined periods (1, 2, or 3 months). All makers produced Biotubes as designed without inflammation over all periods, with the exception of a few cases with minor defects (success rate: 94%). Small hole formation occurred in only a few cases. All Biotubes obtained had an inner diameter of 4 mm and a length of 51 to 52 cm with a wall thickness of 594 ± 97 μm. All Biotubes did not kink when completely bent under an internal pressure of 100 mmHg and did not leak without any deformation under a water pressure of 200 mmHg. Their burst strength was 2409 ± 473 mmHg, and suture retention strength was 1.75 ± 0.27 N, regardless of the embedding period, whereas tensile strength increased from 7.5 ± 1.3 N at 1 month to 9.7 ± 2.0 N at 3 months with the embedding period. The amount of water leakage from the needle holes prepared in the Biotube wall was approximately 1/7th of that in expanded polytetrafluoroethylene vascular grafts. The Biotubes could be easily connected to each other without cutting or anastomosis leaks. They could be stored for at least 1 year at room temperature. This study confirmed that even Biotubes formed 1 month after embedding of Biotube Makers had properties comparable to arteries.
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Affiliation(s)
- Yasuhide Nakayama
- Osaka Laboratory, Biotube Co., Ltd, Osaka, Japan.,Department of Cardiovascular Surgery, Oita University Hospital, Oita, Japan
| | - Ryosuke Iwai
- Institute of Frontier Science and Technology, Okayama University of Science, Okayama, Japan
| | - Takeshi Terazawa
- Advanced Medical Engineering Research Center, Asahikawa Medical University, Hokkaido, Japan
| | - Tsutomu Tajikawa
- Department of Mechanical Engineering, Faculty of Engineering Science, Kansai University, Osaka, Japan
| | - Tadashi Umeno
- Department of Cardiovascular Surgery, Oita University Hospital, Oita, Japan
| | - Takayuki Kawashima
- Department of Cardiovascular Surgery, Oita University Hospital, Oita, Japan
| | - Yumiko Nakashima
- Department of Cardiovascular Surgery, Oita University Hospital, Oita, Japan
| | - Yasuyuki Shiraishi
- Pre-Clinical Research Center, Institute of Development, Aging and Cancer, Tohoku University, Miyagi, Japan
| | - Akihiro Yamada
- Pre-Clinical Research Center, Institute of Development, Aging and Cancer, Tohoku University, Miyagi, Japan
| | - Ryuji Higashita
- Osaka Laboratory, Biotube Co., Ltd, Osaka, Japan.,Department of Cardiovascular Surgery, Yokohama General Hospital, Kanagawa, Japan
| | - Manami Miyazaki
- Department of Cardiovascular Surgery, Yokohama General Hospital, Kanagawa, Japan
| | - Tomonori Oie
- Osaka Laboratory, Biotube Co., Ltd, Osaka, Japan
| | - Satoki Kadota
- Department of Development Promotion, Clinical Research, Innovation and Education Center (CRIETO), Tohoku University Hospital, Miyagi, Japan
| | - Nozomi Yabuuchi
- Department of Development Promotion, Clinical Research, Innovation and Education Center (CRIETO), Tohoku University Hospital, Miyagi, Japan
| | - Fumie Abe
- Department of Development Promotion, Clinical Research, Innovation and Education Center (CRIETO), Tohoku University Hospital, Miyagi, Japan
| | - Marina Funayama-Iwai
- Institute of Frontier Science and Technology, Okayama University of Science, Okayama, Japan
| | - Tomoyuki Yambe
- Pre-Clinical Research Center, Institute of Development, Aging and Cancer, Tohoku University, Miyagi, Japan
| | - Shinji Miyamoto
- Department of Cardiovascular Surgery, Oita University Hospital, Oita, 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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Sato Y, Iwai R, Fukushima M, Nakayama Y. Involvement of somatic stem cells in encapsulation of foreign-body reaction in canine subcutaneous Biotube tissue formation. J Biosci Bioeng 2021; 132:524-530. [PMID: 34420897 DOI: 10.1016/j.jbiosc.2021.07.003] [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: 12/02/2020] [Revised: 07/09/2021] [Accepted: 07/12/2021] [Indexed: 11/30/2022]
Abstract
Generally, the thickness of tubular tissues formed from silicone rods through encapsulation of the foreign-body reaction is less than approximately 0.2 mm. On the other hand, it is unclear how hollow cylindrical molds can provide thick tubular tissues, known as Biotubes, with a thickness exceeding 1 mm, during in-body tissue architecture (iBTA) using encapsulation. In this study, histological and structural analyses were performed to understand the reason for the formation of thick mold-based Biotubes. Molds were assembled with a gap between a silicone rod and a stainless-steel cylinder and were embedded into the dorsal subcutaneous pouches of beagles for 2 or 4 weeks. Thick Biotubes were obtained from the harvested mold. The histological analysis showed that the lumen side of the thick Biotubes consisted primarily of type I collagen fibers and α-smooth muscle actin-positive cells, similar to the original rod-based thin Biotubes formed only from silicone rods. Interestingly, the outer region of the thick Biotubes was an immature connective tissue consisting of type III collagen, including primitive somatic stem cells expressing CD90 and SSEA4. These stem cells may have contributed to the formation of the thick-walled Biotubes by differentiating into other cell types and through growth factor production. Because of the potential tissue-repair ability of these stem cells, iBTA could be useful for elucidating the regeneration process, remodeling the physiology/pathology of tissue defects/damage, and cell acquisition. This technology can provide autologous stem cells without in vitro cell culture. Moreover, thick-walled Biotubes may be useful as an alternative stem cell-containing material in regenerative medicine.
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Affiliation(s)
- Yasushi Sato
- Osaka Laboratory, Biotube Co., Ltd., 3-10-1 Senriyama-higashi, Suita, Osaka 565-0842, Japan; Institute of Frontier Science and Technology, Okayama University of Science, 1-1 Ridaicho, Kita-ku, Okayama, Okayama 700-0005, Japan.
| | - Ryosuke Iwai
- Institute of Frontier Science and Technology, Okayama University of Science, 1-1 Ridaicho, Kita-ku, Okayama, Okayama 700-0005, Japan
| | - Masanori Fukushima
- Translational Research Center for Medical Innovation, Foundation for Biomedical Research and Innovation at Kobe, 2-2 Minatojima Minamimachi, Chuo-ku, Kobe, Hyogo 650-0047, Japan
| | - Yasuhide Nakayama
- Osaka Laboratory, Biotube Co., Ltd., 3-10-1 Senriyama-higashi, Suita, Osaka 565-0842, Japan
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Oe S, Masum MA, Ichii O, Nishimura T, Nakamura T, Namba T, Otani Y, Nakayama Y, Elewa YHA, Kon Y. Spatiotemporal histological changes observed in mouse subcutaneous tissues during the foreign body reaction to silicone. J Biomed Mater Res A 2020; 109:1220-1231. [PMID: 33021053 DOI: 10.1002/jbm.a.37115] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2020] [Revised: 09/30/2020] [Accepted: 10/02/2020] [Indexed: 01/14/2023]
Abstract
We investigated spatiotemporal changes in host tissues during foreign body reactions. Silicone tube was subcutaneously embedded into ICR mice, and tissue surrounding silicone (TSS) was observed at 2, 7, 14, 21, 28, 43, and 70 days (D) postsurgery. The thin layer (TL) and loose connective tissues (LCTs) (inside and outside the TSS) developed until D21 and densified afterward. Neutrophils infiltrated the TSS until D14 and formed neutrophil extracellular traps (NETs) in the TL during D7-21. In the LCTs, mast cell counts increased until D21, and macrophage numbers peaked at D14. Several macrophages showed LYVE-1 expression, supporting a tissue-remodeling role. Developmental indices of collagen fibers (CFs) and reticular fibers (RFs) increased during D2-21. NETs, but not neutrophils, were detected after D28. Mast cell numbers peaked at D43 and were maintained until D70. Myofibroblasts consistently localized to the TL from D14. During D21-28, the area of connective tissue (CNT), and CFs and RFs decreased and increased, respectively, and both remained constant during D28-70. The CF density remained constant from D21 and increased at D70. Thus, TSS showed two phases: inflammation and CNT development (D2-21), and inflammation convergence and CNT stabilization (D28-70). These results provide insights into foreign body reactions in clinical cases.
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Affiliation(s)
- Sao Oe
- Laboratory of Anatomy, Department of Basic Veterinary Sciences, Faculty of Veterinary Medicine, Hokkaido University, Sapporo, Japan
| | - Md Abdul Masum
- Laboratory of Anatomy, Department of Basic Veterinary Sciences, Faculty of Veterinary Medicine, Hokkaido University, Sapporo, Japan.,Department of Anatomy, Histology and Physiology, Faculty of Animal Science and Veterinary Medicine, Sher-e-Bangla Agricultural University, Dhaka, Bangladesh
| | - Osamu Ichii
- Laboratory of Anatomy, Department of Basic Veterinary Sciences, Faculty of Veterinary Medicine, Hokkaido University, Sapporo, Japan.,Laboratory of Agrobiomedical Science, Faculty of Agriculture, Hokkaido University, Sapporo, Japan
| | - Takanori Nishimura
- Laboratory of Agrobiomedical Science, Faculty of Agriculture, Hokkaido University, Sapporo, Japan.,Laboratory of Cell and Tissue Biology, Research Faculty of Agriculture, Hokkaido University, Sapporo, Japan
| | - Teppei Nakamura
- Laboratory of Anatomy, Department of Basic Veterinary Sciences, Faculty of Veterinary Medicine, Hokkaido University, Sapporo, Japan.,Department of Biological Safety Research, Chitose Laboratory, Japan Food Research Laboratories, Chitose, Japan
| | - Takashi Namba
- Laboratory of Anatomy, Department of Basic Veterinary Sciences, Faculty of Veterinary Medicine, Hokkaido University, Sapporo, Japan
| | - Yuki Otani
- Laboratory of Anatomy, Department of Basic Veterinary Sciences, Faculty of Veterinary Medicine, Hokkaido University, Sapporo, Japan
| | | | - Yaser Hosny Ali Elewa
- Laboratory of Anatomy, Department of Basic Veterinary Sciences, Faculty of Veterinary Medicine, Hokkaido University, Sapporo, Japan.,Department of Histology, Faculty of Veterinary Medicine, Zagazig University, Zagazig, Egypt
| | - Yasuhiro Kon
- Laboratory of Anatomy, Department of Basic Veterinary Sciences, Faculty of Veterinary Medicine, Hokkaido University, Sapporo, Japan
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Tanaka K, Fukuda D, Higashikuni Y, Hirata Y, Komuro I, Saotome T, Yamashita Y, Asakura T, Sata M. Biodegradable Extremely-Small-Diameter Vascular Graft Made of Silk Fibroin can be Implanted in Mice. J Atheroscler Thromb 2020; 27:1299-1309. [PMID: 32101838 PMCID: PMC7840168 DOI: 10.5551/jat.52720] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
Aim: Synthetic vascular grafts are widely used in surgical revascularization, mainly for medium- to large-sized vessels. However, synthetic grafts smaller than 6 mm in diameter are associated with a high incidence of thrombosis. In this study, we evaluated silk fibroin, a major protein of silk, with high biocompatibility and biodegradability, as a useful material for extremely-small-diameter vascular grafts. Methods: A small-sized (0.9 mm inner diameter) graft was braided from a silk fibroin thread. The right carotid arteries of 8- to 14-week-old male C57BL/6 mice were cut at the midpoint, and fibroin grafts (5- to 7-mm in length) were transplanted using a cuff technique with polyimide cuffs. The grafts were harvested at different time points and analyzed histologically. Results: CD31+ endothelial cells had already started to proliferate at 2 weeks after implantation. At 4 weeks, neointima had formed with α-smooth muscle actin+ cells, and the luminal surface was covered with CD31+ endothelial cells. Mac3+ macrophages were accumulated in the grafts. Graft patency was confirmed at up to 6 months after implantation. Conclusion: This mouse model of arterial graft implantation enables us to analyze the remodeling process and biocompatibility of extremely-small-diameter vascular grafts. Biodegradable silk fibroin might be applicable for further researches using genetically modified mice.
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Affiliation(s)
- Kimie Tanaka
- Division for Health Service Promotion, the University of Tokyo.,Department of Cardiovascular Medicine, the University of Tokyo
| | - Daiju Fukuda
- Department of Cardio-Diabetes Medicine, Tokushima University Graduate School of Biomedical Sciences
| | | | | | - Issei Komuro
- Department of Cardiovascular Medicine, the University of Tokyo
| | - Toshiki Saotome
- Research and Development Center, The Japan Wool Textile Co., Ltd
| | | | - Tetsuo Asakura
- Department of Biotechnology, Tokyo University of Agriculture & Technology
| | - Masataka Sata
- Department of Cardiovascular Medicine, Tokushima University Graduate School of Biomedical Sciences
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Li X, Xu J, Bartolák-Suki E, Jiang J, Tien J. Evaluation of 1-mm-diameter endothelialized dense collagen tubes in vascular microsurgery. J Biomed Mater Res B Appl Biomater 2020; 108:2441-2449. [PMID: 32017412 DOI: 10.1002/jbm.b.34576] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2019] [Revised: 01/08/2020] [Accepted: 01/19/2020] [Indexed: 11/08/2022]
Abstract
Although much progress has been made in engineering vascular grafts for large- and small-diameter arterial repair or bypass, the extension of these results to the microsurgical size scale has been challenging. Here, we evaluated the use of dense collagen tubes (outer diameter 1 mm, inner diameter 0.5 mm) for vascular microsurgery as interpositional grafts to the femoral artery of Lewis rats. These tubes were formed by dehydrating tubular collagen gels around a mandrel, crosslinking them with genipin, seeding with syngeneic endothelial cells, and culturing before implantation by suture anastomosis. The retention of a confluent endothelial lining inside the tubes after mock surgical handling depended strongly on the crosslinker concentration and culture time. Optimized preparation conditions enabled retention of endothelium after mock surgical handling in ~80% of tubes and maintenance of patency 7 days after implantation in ~40% of grafts. Histological analysis showed the development of granulation tissue and the presence of CD31-positive structures on the inner and outer surfaces of implants. This study provides a proof-of-principle demonstration that endothelialized dense collagen tubes can remain patent for up to 7 days after vascular microsurgery, and points to the importance of mild scaffold crosslinking for maintaining firm endothelial adhesion.
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Affiliation(s)
- Xuanyue Li
- Department of Biomedical Engineering, Boston University, Boston, Massachusetts
| | - Jing Xu
- Department of Biomedical Engineering, Boston University, Boston, Massachusetts
| | | | - John Jiang
- Department of Biomedical Engineering, Boston University, Boston, Massachusetts
| | - Joe Tien
- Department of Biomedical Engineering, Boston University, Boston, Massachusetts.,Division of Materials Science and Engineering, Boston University, Boston, Massachusetts
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11
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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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Furukoshi M, Tatsumi E, Nakayama Y. Application of in-body tissue architecture-induced Biotube vascular grafts for vascular access: Proof of concept in a beagle dog model. J Vasc Access 2019; 21:314-321. [PMID: 31530219 DOI: 10.1177/1129729819874318] [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] [Indexed: 11/16/2022] Open
Abstract
INTRODUCTION The first choice of vascular access for hemodialysis is an autogenous arteriovenous fistula, because prosthetic arteriovenous grafts have a high probability of failure. In this study, Biotubes, in-body tissue architecture-induced autologous collagenous tubes, were evaluated for their potential use as vascular access grafts. Three animal implantation models were developed using beagle dogs, and the in vivo performance of Biotubes was observed after implantation in the acute phase as a pilot study. METHODS Biotubes (internal diameter ca. 4.0 mm, length ca. 5.0 cm, and wall thickness ca. 0.7 mm) were prepared through subcutaneous embedding of specially designed molds in beagle dogs for 8 weeks. The Biotubes were then implanted between the common carotid artery and the jugular vein of beagles via three methods, including side-to-side (in) -end-to-end (out) as type 1 (n = 4), side-to-side (both) as type 2 (n = 4), and side-to-end (in) -end-to-side (out) as type 3 (n = 1 using a composite Biotube). RESULTS Although two cases in type 1 and 2 resulted in Biotube deformation, all cases were patent for 4 weeks and maintained a continuous turbulent flow. At 4 weeks after implantation, percutaneous puncture could be performed repeatedly without aneurysm formation or hemorrhage. CONCLUSION Within a short implantation period, with limited animal numbers, this proof-of-concept study showed that Biotubes may have a high potential for use in vascular access.
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Affiliation(s)
- Maya Furukoshi
- Department of Regenerative Medicine and Tissue Engineering, Research Institute, National Cerebral and Cardiovascular Center, Suita, Japan.,Division of Cell Engineering, Graduate School of Chemical Sciences and Engineering, Hokkaido University, Sapporo, Japan
| | - Eisuke Tatsumi
- Department of Artificial Organs, Research Institute, National Cerebral and Cardiovascular Center, Suita, Japan
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13
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Nakayama Y, Kaneko Y, Okumura N, Terazawa T. Initial 3-year results of first human use of an in-body tissue-engineered autologous “Biotube” vascular graft for hemodialysis. J Vasc Access 2019; 21:110-115. [DOI: 10.1177/1129729819852550] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
This study presents the initial 3-year results of the first in-human study of internal shunt restoration using completely autologous vascular grafts, “Biotubes,” based on in-body tissue architecture. Biotubes (diameter, 6 mm; length, 7 cm) were prepared as autologous collagenous tubular tissues with approximately 0.5 mm wall thickness by embedding molds (two per patient), assembled with a silicone rod and a stainless steel pipe with many slits, into the patients’ abdominal subcutaneous tissue for 2 months. Two female patients with end-stage renal disease were undergoing hemodialysis with a high probability of failure due to repeated stenosis every few months at the venous outflow regions over 1.5 years. Biotubes formed in both patients and were bypassed over the venous stenosis region of the arteriovenous shunt. After bypass with Biotubes without living cells, palpable thrill and typical turbulent flow pattern were observed by pulsed-wave Doppler. Follow-up angiography showed no signs of dilation or stenosis after implantation, and puncture could be performed easily without graft damage. In both cases, stenosis of Biotubes occurred after 3–4 months. In the first case, percutaneous transluminal angioplasty was not required for over 2 years after implantation even after the development of Biotube stenosis. In the second case, stenosis at the proximal anastomotic site of the Biotube became prominent, and percutaneous transluminal angioplasty was needed 7 months after implantation and then repeated at up to 2 years. This was the first human study successfully supporting the concept of internal shunt restoration for hemodialysis using an autologous Biotube.
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Affiliation(s)
| | | | - Noriko Okumura
- Department of Kidney and Dialysis, Tenri Hospital, Tenri, Japan
| | - Takeshi Terazawa
- Department of Mechanical Systems Engineering, Aichi University of Technology, Gamagori, Japan
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Nakayama Y, Furukoshi M, Tatsumi E. Shape memory of in-body tissue-engineered Biotube® vascular grafts and the preliminary evaluation in animal implantation experiments. THE JOURNAL OF CARDIOVASCULAR SURGERY 2019; 61:208-213. [PMID: 31058478 DOI: 10.23736/s0021-9509.19.10594-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
BACKGROUND Tissues formed by in-body tissue architecture (iBTA) are soft and flexible. However, strongly bending iBTA-induced vascular grafts, called biotubes, may cause lumen collapse by kinking, subsequently leading to occlusion after implantation. In this study, we developed a method for biotube shape memory and verified its performance in preliminary animal implantation experiments. METHODS Straight biotubes were prepared by subcutaneous embedding of straight molds into beagle dogs for two months. Upon overnight immersion of the obtained straight biotubes in a 70% ethanol solution under U-shape framing, the biotubes maintained their U shape even after washing with saline solution. Additionally, spiral-shaped biotubes formed from goats using spiral molds could be stretched straight via the same alcohol treatment. RESULTS Within limited acute-phase animal implantation experiments, U-shaped biotubes functioned as AV shunt grafts in the femoral region of the beagle without deformation of vascular shape (N.=11). In addition, the long straight biotubes derived from spiral molds could be interposed between goat carotid arteries while maintaining their straight shape (N.=2). All implants maintained perfect patency at the 1-month follow-up period without any evidence of vascular deformation. CONCLUSIONS By retaining iBTA-induced tissues in an alcohol solution in the target shape, the shape of the tissues was imprinted and maintained even after implantation within a limited acute period. Therefore, in order to obtain tissues of various shapes, it is unnecessary to use a mold design to maintain the individual shape.
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Affiliation(s)
| | - Maya Furukoshi
- Division of Cell Engineering, Graduate School of Chemical Science and Engineering, Hokkaido University, Sapporo, Hokkaido, Japan
| | - Eisuke Tatsumi
- Department of Artificial Organs, National Cerebral and Cardiovascular Center Research Institute, Osaka, Japan
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Nakayama Y, Furukoshi M, Terazawa T, Iwai R. Development of long in vivo tissue-engineered “Biotube” vascular grafts. Biomaterials 2018; 185:232-239. [DOI: 10.1016/j.biomaterials.2018.09.032] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2018] [Revised: 09/01/2018] [Accepted: 09/17/2018] [Indexed: 12/25/2022]
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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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