Satoshi Umeda1, Yasuhide Nakayama2, Takeshi Terazawa3, Ryosuke Iwai4, Shohei Hiwatashi1, Kengo Nakahata1, Yuichi Takama1, Hiroomi Okuyama5. 1. Department of Pediatric Surgery, Osaka University Graduate School of Medicine, 2-2 Yamadaoka Suita, Osaka, 565-0871, Japan. 2. Biotube Co., Ltd., 2-13-11, Shinkawa, Chuo, Tokyo, 104-0033, Japan. 3. Division of Cell Engineering, Graduate School of Chemical Science and Engineering, Hokkaido University, Kita 13 Nishi 8, Kita-ku, Sapporo, 060-8628, Hokkaido, Japan. 4. Research Institute of Technology, Okayama University of Science, 1-1 Ridaicho, Kita-ku, Okayama, 700-0005, Japan. 5. Department of Pediatric Surgery, Osaka University Graduate School of Medicine, 2-2 Yamadaoka Suita, Osaka, 565-0871, Japan. okuyama@pedsurg.med.osaka-u.ac.jp.
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.
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.
Entities:
Keywords:
Dog (beagle); Patch tracheoplasty; Regenerative medicine; Scaffold; Trachea
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