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Amino M, Nakano M, Komatsu T, Yoshizawa R, Kunugita F, Shinozaki N, Ogasawara K, Morino Y, Yoshioka K, Ikari Y. P737Sympathetic-parasympathetic imbalance by Holter analysis following carotid endarterectomy may be associated with a potential cause of myocardial infarction. Eur Heart J 2018. [DOI: 10.1093/eurheartj/ehy564.p737] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Affiliation(s)
- M Amino
- Tokai University School of Medicine, Isehara, Japan
| | - M Nakano
- Tokai University School of Medicine, Isehara, Japan
| | - T Komatsu
- Iwate University Hospital, Division of Cardiology, Iwate, Japan
| | - R Yoshizawa
- Iwate University Hospital, Division of Cardiology, Iwate, Japan
| | - F Kunugita
- Iwate University Hospital, Division of Cardiology, Iwate, Japan
| | - N Shinozaki
- Tokai University School of Medicine, Isehara, Japan
| | - K Ogasawara
- Iwate University Hospital, Department of neurosurgery, Iwate, Japan
| | - Y Morino
- Iwate University Hospital, Division of Cardiology, Iwate, Japan
| | - K Yoshioka
- Tokai University School of Medicine, Isehara, Japan
| | - Y Ikari
- Tokai University School of Medicine, Isehara, Japan
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Shinozaki N, Iwasaki Y, Doi H, Imoto Y, Ikari Y. P2663Results from a multicenter study of transradial iliac artery stenting in Japan. Eur Heart J 2018. [DOI: 10.1093/eurheartj/ehy565.p2663] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- N Shinozaki
- Tokai University School of Medicine, Isehara, Japan
| | - Y Iwasaki
- Osaka General Medical Center, Cardiology, Osaka, Japan
| | - H Doi
- Kumamoto Rosai Hospital, Cardiology, Yatsushiro, Japan
| | - Y Imoto
- Fukuoka Wajiro Hospital, Cardiology, Fukuoka, Japan
| | - Y Ikari
- Tokai University School of Medicine, Isehara, Japan
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Ikari Y, Shinozaki N, Yoshimachi F, Nakazawa G, Ohno Y, Nakano M, Fujii T, Murakami T. P2601New application of universal guiding catheter Ikari Left to balloon pulmonary angioplasty for chronic thromboembolic pulmonary hypertension. Eur Heart J 2017. [DOI: 10.1093/eurheartj/ehx502.p2601] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Affiliation(s)
- N. Shinozaki
- Faculty of Science and Technology, Keio University, Hoyoshi, Kohoku-ku, Yokohama, Japan
| | - T. Iida
- Faculty of Science and Technology, Keio University, Hoyoshi, Kohoku-ku, Yokohama, Japan
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Matsutani T, Hirono S, Shinozaki N, Iwadate Y, Saeki N. NT-22 * PAV TREATMENT WITHOUT IMMEDIATE RADIOTHERAPY FOR ANAPLASTIC OLIGODENDROGLIAL TUMOR WITH 1p/19q CO-DELETION. Neuro Oncol 2014. [DOI: 10.1093/neuonc/nou265.20] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Iwadate Y, Suganami A, Tamura Y, Matsutani T, Hirono S, Shinozaki N, Ikegami S, Saeki N. RM-03 * ACQUISITION OF STEM-CELL PHENOTYPE THROUGH EPITHELIAL MESENCHYMAL TRANSITION IN GLIOBLASTOMA. Neuro Oncol 2014. [DOI: 10.1093/neuonc/nou273.3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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Matsumura S, Higa K, Igarashi T, Takaichi S, Tonogi M, Shinozaki N, Shimazaki J, Yamane GY. Characterization of mesenchymal progenitor cell populations from non-epithelial oral mucosa. Oral Dis 2014; 21:361-72. [PMID: 25180458 DOI: 10.1111/odi.12288] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2012] [Revised: 12/27/2013] [Accepted: 08/26/2014] [Indexed: 12/22/2022]
Abstract
OBJECTIVES The characteristics of cell populations extracted from oral mucosal non-epithelial tissues and their ability to differentiate were evaluated in vitro as a potential source of cells for mandibular and corneal regeneration. MATERIALS AND METHODS Oral mucosal non-epithelial cells (OMNECs) were extracted from tissue samples and were studied by flow cytometry and RT-PCR. Cells differentiating into osteoblasts, adipocytes, chondrocytes, neurocytes, or keratocytes were characterized by RT-PCR and cell staining. RESULTS OMNECs expressed CD44, CD90, CD105, CD166, and STRO-1 antigens, which are markers for mesenchymal stem cells. In addition, Oct3/4, c-Myc, Nanog, KLF4, and Rex, which are expressed by embryonic or pluripotent stem cells, were detected by RT-PCR. Expression of CD49d, CD56, and PDGFRα, proteins closely associated with the neural crest, was observed in OMNECs, as was expression of Twist1, Sox9, Snail1 and Snail2, which are early neural crest and neural markers. Specific differentiation markers were expressed in OMNECs after differentiation into osteoblasts, adipocytes, chondrocytes, or keratocytes. CONCLUSIONS Populations of OMNECs may contain both mesenchymal stem cells and neural crest origin cells and are a potential cell source for autologous regeneration of mandibular or corneal stroma.
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Affiliation(s)
- S Matsumura
- Department of Oral Medicine, Oral and Maxillofacial Surgery, Tokyo Dental College, Chiba, Japan
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Takaichi S, Muramatsu T, Lee JM, Jung HS, Shinozaki N, Katakura A, Yamane GY. Re-epithelialization of the Buccal Mucosa after Alkaline Chemical Injury. Acta Histochem Cytochem 2014; 47:195-201. [PMID: 25861125 PMCID: PMC4387240 DOI: 10.1267/ahc.14015] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2014] [Accepted: 07/01/2014] [Indexed: 12/12/2022] Open
Abstract
Alkaline conditions in the oral cavity may be caused by a variety of stimuli, including tobacco products, antacids, alkaline drinking water and bicarbonate toothpaste. However, the effects of an alkaline pH on the oral mucosa had not been elucidated. The purpose of this study was to investigate how basal keratinocytes are actively involved in re-epithelialization after alkaline chemical injury. We generated epithelial defects in the oral mucosa of mice by applying an alkaline chemical, and the localization of cytokeratin 13, cytokeratin 14, PCNA and p63 was investigated during the re-epithelialization process. PCNA- and p63-positive staining was seen in basal cells covering the wound surface at 1 day after the chemical injury. Cytokeratin 14-positive and PCNA-negative basal keratinocytes were localized in a few layers of the wound epithelium during epithelial outgrowth. Cytokeratin 14-positive and PCNA-positive basal keratinocytes, indicating proliferation, were localized over the entire layer of the epithelium at the wound margin. These results imply that basal keratinocytes at the wound margin migrate to the wound surface, provoke differentiation and keratinization during epithelial outgrowth and that epithelial cells are supplied from the wound margin to the epithelial outgrowth after alkaline chemical injury.
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Affiliation(s)
- Saneyuki Takaichi
- Oral Health Science Center hrc7, Tokyo Dental College
- Department of Oral Medicine, Oral and Maxillofacial Surgery, Tokyo Dental College
| | - Takashi Muramatsu
- Oral Health Science Center hrc7, Tokyo Dental College
- Department of Endodontics and Clinical Cariology, Tokyo Dental College
| | - Jong-Min Lee
- Division in Anatomy and Developmental Biology, Department of Oral Biology, Research Center for Orofacial Hard Tissue Regeneration, Brain Korea 21 Project, Yonsei University College of Dentistry
| | - Han-Sung Jung
- Division in Anatomy and Developmental Biology, Department of Oral Biology, Research Center for Orofacial Hard Tissue Regeneration, Brain Korea 21 Project, Yonsei University College of Dentistry
| | - Naoshi Shinozaki
- Oral Health Science Center hrc7, Tokyo Dental College
- Cornea Center, Tokyo Dental College
| | - Akira Katakura
- Department of Oral Medicine, Oral and Maxillofacial Surgery, Tokyo Dental College
| | - Gen-yuki Yamane
- Oral Health Science Center hrc7, Tokyo Dental College
- Department of Oral Medicine, Oral and Maxillofacial Surgery, Tokyo Dental College
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Ishii A, Muramatsu T, Lee JM, Higa K, Shinozaki N, Jung HS, Shibahara T. Expression of p75(NGFR), a Proliferative and Basal Cell Marker, in the Buccal Mucosa Epithelium during Re-epithelialization. Acta Histochem Cytochem 2014; 47:145-53. [PMID: 25392568 PMCID: PMC4164702 DOI: 10.1267/ahc.14011] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2014] [Accepted: 05/23/2014] [Indexed: 11/22/2022] Open
Abstract
We investigated the expression of p75NGFR, a proliferative and basal cell marker, in the mouse buccal mucosa epithelium during wound healing in order to elucidate the role of epithelial stem cells. Epithelial defects were generated in the epithelium of the buccal mucosa of 6-week-old mice using CO2 laser irradiation. BrdU was immediately administered to mice following laser irradiation. They were then sacrificed after 1, 3, 7, and 14 days. Paraffin sections were prepared and the irradiated areas were analyzed using immunohistochemistry with anti-p75NGFR, BrdU, PCNA, and CK14 antibodies. During re-epithelialization, PCNA (–)/p75NGFR (+) cells extended to the wound, which then closed, whereas PCNA (+)/p75NGFR (+) cells were not observed at the edge of the wound. In addition, p75NGFR (–)/CK14 (+), which reflected the presence of post-mitotic differentiating cells, was observed in the supra-basal layers of the extended epithelium. BrdU (+)/p75NGFR (+), which reflected the presence of epithelial stem cells, was detected sparsely in buccal basal epithelial cells after healing, and disappeared after 7 days. These results suggest that p75NGFR (+) keratinocytes are localized in the basal layer, which contains oral epithelial stem cells, and retain the ability to proliferate in order to regenerate the buccal mucosal epithelium.
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Affiliation(s)
- Akihiro Ishii
- Department of Oral and Maxillofacial Surgery, Tokyo Dental College
| | - Takashi Muramatsu
- Department of Endodontics and Clinical Cariology, Tokyo Dental College
| | - Jong-Min Lee
- Division in Anatomy and Developmental Biology, Department of Oral Biology, Research Center for Orofacial Hard Tissue Regeneration, Brain Korea 21 Project, Yonsei University College of Dentistry
| | - Kazunari Higa
- Department of Ophthalmology, Ichikawa General Hospital, Tokyo Dental College
- Cornea Center, Ichikawa General Hospital, Tokyo Dental College
| | - Naoshi Shinozaki
- Department of Ophthalmology, Ichikawa General Hospital, Tokyo Dental College
- Cornea Center, Ichikawa General Hospital, Tokyo Dental College
| | - Han-Sung Jung
- Division in Anatomy and Developmental Biology, Department of Oral Biology, Research Center for Orofacial Hard Tissue Regeneration, Brain Korea 21 Project, Yonsei University College of Dentistry
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Iida O, Soga Y, Takahara M, Kawasaki D, Yamauchi Y, Suzuki K, Hirano K, Koshida R, Kamoi D, Tazaki J, Higashitani M, Shintani Y, Yamaoka T, Okazaki S, Suematsu N, Tsuchiya T, Miyashita Y, Shinozaki N, Takahashi H, Uematsu M. Perioperative Complications After Aorto-iliac Stenting: Associated Factors and Impact on Follow-up Cardiovascular Prognosis. Eur J Vasc Endovasc Surg 2014; 47:131-8. [DOI: 10.1016/j.ejvs.2013.09.024] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Natsumeda M, Nakazawa G, Torii S, Murakami T, Ijichi T, Ohno Y, Masuda N, Shinozaki N, Ogata N, Ikari Y. A new scoring system for predicting FFR results. Eur Heart J 2013. [DOI: 10.1093/eurheartj/eht310.p5528] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Abstract
Modern transplantation of cells, tissues and organs has been practiced within the last century achieving both life saving and enhancing results. Associated risks have been recognized including infectious disease transmission, malignancy, immune mediated disease and graft failure. This has resulted in establishment of government regulation, professional standard setting and establishment of vigilance and surveillance systems for early detection and prevention and to improve patient safety. The increased transportation of grafts across national boundaries has made traceability difficult and sometimes impossible. Experience during the first Gulf War with mis-identification of blood units coming from multiple countries without standardized coding and labeling has led international organizations to develop standardized nomenclature and coding for blood. Following this example, cell therapy and tissue transplant practitioners have also moved to standardization of coding systems. Establishment of an international coding system has progressed rapidly and implementation for blood has demonstrated multiple advantages. WHO has held two global consultations on human cells and tissues for transplantation, which recognized the global circulation of cells and tissues and growing commercialization and the need for means of coding to identify tissues and cells used in transplantation, are essential for full traceability. There is currently a wide diversity in the identification and coding of tissue and cell products. For tissues, with a few exceptions, product terminology has not been standardized even at the national level. Progress has been made in blood and cell therapies with a slow and steady trend towards implementation of the international code ISBT 128. Across all fields, there are now 3,700 licensed facilities in 66 countries. Efforts are necessary to encourage the introduction of a standardized international coding system for donation identification numbers, such as ISBT 128, for all donated biologic products.
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Affiliation(s)
- D Michael Strong
- Department of Orthopaedics and Sports Medicine, University of Washington School of Medicine, Seattle, WA, USA.
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Liu W, Deng C, McLaughlin CR, Fagerholm P, Lagali NS, Heyne B, Scaiano JC, Watsky MA, Kato Y, Munger R, Shinozaki N, Li F, Griffith M. Collagen-phosphorylcholine interpenetrating network hydrogels as corneal substitutes. Biomaterials 2008; 30:1551-9. [PMID: 19097643 DOI: 10.1016/j.biomaterials.2008.11.022] [Citation(s) in RCA: 127] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2008] [Accepted: 11/09/2008] [Indexed: 12/24/2022]
Abstract
A biointeractive collagen-phospholipid corneal substitute was fabricated from interpenetrating polymeric networks comprising 1-ethyl-3-(3-dimethyl aminopropyl) carbodiimide and N-hydroxysuccinimide crosslinked porcine atelocollagen, and poly(ethylene glycol) diacrylate crosslinked 2-methacryloyloxyethyl phosphorylcholine (MPC). The resulting hydrogels showed an overall increase in mechanical strength beyond that of either original component and enhanced stability against enzymatic digestion (by collagenase) or UV degradation. More strikingly, these hydrogels retained the full biointeractive, cell friendly properties of collagen in promoting corneal cell and nerve in-growth and regeneration (despite MPC's known anti-adhesive properties). Measurements of refractive indices, white light transmission and backscatter showed the optical properties of collagen-MPC are comparable or superior to those of the human cornea. In addition, the glucose and albumin permeability were comparable to those of human corneas. Twelve-month post-implantation results of collagen-MPC hydrogels into mini-pigs showed regeneration of corneal tissue (epithelium, stroma) as well as the tear film and sensory nerves. We also show that porcine collagen can be substituted with recombinant human collagen, resulting in a fully-synthetic implant that is free from the potential risks of disease transmission (e.g. prions) present in animal source materials.
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Affiliation(s)
- Wenguang Liu
- Department of Cellular and Molecular Medicine, University of Ottawa, Ottawa, Ontario, Canada
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Hosoya A, Lee JM, Cho SW, Kim JY, Shinozaki N, Shibahara T, Shimono M, Jung HS. Morphological evidence of basal keratinocyte migration during the re-epithelialization process. Histochem Cell Biol 2008; 130:1165-75. [DOI: 10.1007/s00418-008-0499-3] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/14/2008] [Indexed: 10/21/2022]
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Kim YJ, Kwon HJ, Shinozaki N, Hashimoto S, Shimono M, Cho SW, Jung HS. Comparative analysis of ABCG2-expressing and label-retaining cells in mouse submandibular gland. Cell Tissue Res 2008; 334:47-53. [PMID: 18688650 DOI: 10.1007/s00441-008-0667-8] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2008] [Accepted: 06/24/2008] [Indexed: 11/30/2022]
Abstract
The submandibular gland (SMG) is a tissue that can be regenerated in a tissue injury model and that has adult stem cells capable of self-renewal and differentiation into functional cells. We have analyzed the localization of label-retaining cells (LRCs), which are putative progenitor cells, by using the BrdU-labeling method. 5-Bromo-2'-deoxyuridine (BrdU) injection followed by a long chasing period permitted the identification of LRCs based on the slow-cycling characteristic. In order to confirm the accurate localization of LRCs, BrdU and SMG-specific markers, including aquaporin5, cytokeratin, and smooth muscle actin, were examined by double-immunofluorescence staining. We found that LRCs were distributed in the acinus, duct, myoepithelium, and connective tissue. Moreover, ABCG2 (a known stem cell marker) was used for the characterization of LRCs and the localization of cells as putative stem/progenitor cells. ABCG2-expressing cells were distributed in various regions of the SMG but did not co-localize with LRCs. We suggest that putative progenitor cells exist in various regions of the SMG and have diverse capacities to differentiate into specific cells.
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Affiliation(s)
- Yeun-Jung Kim
- Department of Oral Biology, Research Center for Orofacial Hard Tissue Regeneration, College of Dentistry, Yonsei University, Seodaemoon-Gu, Seoul, 120-752, Korea
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Merrett K, Fagerholm P, McLaughlin CR, Dravida S, Lagali N, Shinozaki N, Watsky MA, Munger R, Kato Y, Li F, Marmo CJ, Griffith M. Tissue-engineered recombinant human collagen-based corneal substitutes for implantation: performance of type I versus type III collagen. Invest Ophthalmol Vis Sci 2008; 49:3887-94. [PMID: 18515574 DOI: 10.1167/iovs.07-1348] [Citation(s) in RCA: 101] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
PURPOSE To compare the efficacies of recombinant human collagens types I and III as corneal substitutes for implantation. METHODS Recombinant human collagen (13.7%) type I or III was thoroughly mixed with 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide and N-hydroxysuccinimide. The final homogenous solution was either molded into sheets for in vitro studies or into implants with the appropriate corneal dimensions for transplantation into minipigs. Animals with implants were observed for up to 12 months after surgery. Clinical examinations of the cornea included detailed slit lamp biomicroscopy, in vivo confocal microscopy, and fundus examination. Histopathologic examinations were also performed on corneas harvested after 12 months. RESULTS Both cross-linked recombinant collagens had refractive indices of 1.35, with optical clarity similar to that in human corneas. Their chemical and mechanical properties were similar, although RHC-III implants showed superior optical clarity. Implants into pig corneas over 12 months show comparably stable integration, with regeneration of corneal cells, tear film, and nerves. Optical clarity was also maintained in both implants, as evidenced by fundus examination. CONCLUSIONS Both RHC-I and -III implants can be safely and stably integrated into host corneas. The simple cross-linking methodology and recombinant source of materials makes them potentially safe and effective future corneal matrix substitutes.
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Liu W, Merrett K, Griffith M, Fagerholm P, Dravida S, Heyne B, Scaiano JC, Watsky MA, Shinozaki N, Lagali N, Munger R, Li F. Recombinant human collagen for tissue engineered corneal substitutes. Biomaterials 2008; 29:1147-58. [DOI: 10.1016/j.biomaterials.2007.11.011] [Citation(s) in RCA: 175] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2007] [Accepted: 11/07/2007] [Indexed: 11/25/2022]
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Yamamoto T, Noiri E, Ono Y, Doi K, Negishi K, Kamijo A, Kimura K, Fujita T, Kinukawa T, Taniguchi H, Nakamura K, Goto M, Shinozaki N, Ohshima S, Sugaya T. Renal L-type fatty acid--binding protein in acute ischemic injury. J Am Soc Nephrol 2007; 18:2894-902. [PMID: 17942962 DOI: 10.1681/asn.2007010097] [Citation(s) in RCA: 253] [Impact Index Per Article: 14.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Fatty acid-binding proteins (FABPs) bind unsaturated fatty acids and lipid peroxidation products during tissue injury from hypoxia. We evaluated the potential role of L-type FABP (L-FABP) as a biomarker of renal ischemia in both human kidney transplant patients and animal models. Urinary L-FABP levels were measured in the first urine produced from 12 living-related kidney transplant patients immediately after reperfusion of their transplanted organs, and intravital video analysis of peritubular capillary blood flow was performed simultaneously. A significant direct correlation was found between urinary L-FABP level and both peritubular capillary blood flow and the ischemic time of the transplanted kidney (both P < 0.0001), as well as hospital stay (P < 0.05). In human-L-FABP transgenic mice subjected to ischemia-reperfusion injury, immunohistological analyses demonstrated the transition of L-FABP from the cytoplasm of proximal tubular cells to the tubular lumen. In addition, after injury, these transgenic mice demonstrated lower blood urea nitrogen levels and less histological injury than injured wild-type mice, likely due to a reduction of tissue hypoxia. In vitro experiments using a stable cell line of mouse proximal tubule cells transfected with h-L-FABP cDNA showed reduction of oxidative stress during hypoxia compared to untransfected cells. Taken together, these data show that increased urinary L-FABP after ischemic-reperfusion injury may find future use as a biomarker of acute ischemic injury.
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Affiliation(s)
- Tokunori Yamamoto
- Department of Urology, University Hospital, Nagoya University, Nagoya, Japan 113-8655
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Lagali NS, Griffith M, Shinozaki N, Fagerholm P, Munger R. Innervation of Tissue-Engineered Corneal Implants in a Porcine Model: A 1-Year In Vivo Confocal Microscopy Study. ACTA ACUST UNITED AC 2007; 48:3537-44. [PMID: 17652721 DOI: 10.1167/iovs.06-1483] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
PURPOSE To examine the pattern of nerve regeneration within tissue-engineered corneal substitutes grafted into host porcine corneas over a 1-year postoperative period. METHODS Biodegradable corneal substitutes from cross-linked collagen were implanted into the left eyes of 12 pigs by deep lamellar keratoplasty. Regeneration of severed nerves into the central implant region was investigated with in vivo confocal microscopy. Both implant-recipient and control (right) eyes were examined before surgery and 2, 6, 10, and 12 months after surgery, to quantify the number, density, diameter, and branching of nerve fiber bundles at various corneal depths. Transmission electron microscopy was used to confirm the presence of nerve bundles. RESULTS Two months after surgery, corneal nerve ingrowth was observed within the deep anterior stroma, with a number and density of regenerated nerves significantly higher than in nonsurgical control eyes (P < 0.01). Nerves within the superficial anterior stroma regenerated by 6 to 10 months after surgery, and the first subbasal epithelial nerves were seen 10 months after surgery. After 1 year, subbasal nerve density recovered to preoperative levels. Nerve fibers in the deep anterior stroma remained significantly thinner relative to control eyes after 1 year (P < 0.001), where both superficial anterior and subbasal nerve diameter did not change relative to control eyes. CONCLUSIONS The pattern of reinnervation within tissue-engineered corneal substitutes has been quantified in vivo. Innervation proceeded rapidly in the deep anterior stroma, followed by repopulation of more superficial regions. One year after surgery, nerve density within the tissue-engineered cornea increased or remained unchanged relative to controls in all corneal regions examined.
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Affiliation(s)
- Neil S Lagali
- University of Ottawa Eye Institute, Ottawa, ON, Canada
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Uchino Y, Goto E, Takano Y, Dogru M, Shinozaki N, Shimmura S, Yagi Y, Tsubota K, Shimazaki J. Long-standing bullous keratopathy is associated with peripheral conjunctivalization and limbal deficiency. Ophthalmology 2006; 113:1098-101. [PMID: 16647124 DOI: 10.1016/j.ophtha.2006.01.034] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2005] [Revised: 01/16/2006] [Accepted: 01/17/2006] [Indexed: 10/24/2022] Open
Abstract
OBJECTIVE To investigate whether peripheral corneal neovascularization in bullous keratopathy (BK) is due to conjunctivalization, a sign of limbal stem cell deficiency. DESIGN Observational case-control study. PARTICIPANTS Sixteen BK patients. METHODS Patients were divided into 2 groups: BK without peripheral neovascularization [NV(-) group; 5 patients, 5 eyes] and BK with neovascularization [NV(+) group; 11 patients, 13 eyes]. Evidence of conjunctivalization was evaluated by periodic acid-Schiff staining of impression cytology samples from the peripheral vascularized cornea. The 2 groups' durations of disease also were compared. Penetrating keratoplasty (PK) was performed in all 16 cases, and the 2 groups' durations of reepithelialization after PK were compared. MAIN OUTCOME MEASURES Presence of goblet cells using impression cytology, duration of BK, and duration of postoperative reepithelialization. RESULTS Goblet cells were found on the peripheral corneal surface in all eyes in the NV(+) group. However, all eyes in the NV(-) group were negative for goblet cells (P<0.0001). Duration of disease was 14.4+/-5.4 months in the NV(-) group and 66.2+/-65.5 months in the NV(+) group (P = 0.030). Duration of postoperative epithelialization was 6.2+/-2.2 days in the NV(-) group and 28.8+/-36.5 days in the NV(+) group (P = 0.046). CONCLUSION Conjunctivalization of the peripheral cornea and delayed postoperative epithelialization in BK patients with NV suggest the presence of limbal stem cell deficiency in such patients. Patients with long-standing disease were found to be more prone to neovascularization. For this reason, early surgery may lead to a better surgical outcome.
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Affiliation(s)
- Yuichi Uchino
- Department of Ophthalmology, Tokyo Dental College, Chiba, Japan
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Hasegawa T, Shinozaki N, Ohshima S. [Donor action program]. Nihon Rinsho 2005; 63:1873-7. [PMID: 16277247] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
Recent advances of organ transplantation accelerated shortage of organs. Donor Action Program (DAP) was developed to establish a proper donation process in a hospital using total quality management methodology. It has been demonstrated effective in increasing donation and has been introduced in 23 countries. In Japan preliminary study demonstrated that (1) DAP could be implemented and was likely to increase donation in Japan, (2) Japanese healthcare staffs were likely to underestimate social needs and clinical results of transplantation and to be suspicious about brain death, (3) they had limited knowledge and experience in communicating with family members of the deceased, and their needs for education were not satisfied. In order to implement DAP in Japan, an organization which is responsible for data management and development for educational program should be considered with high priority.
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Affiliation(s)
- Tomonori Hasegawa
- Division of Health Policy and Health Service Research, Department of Social Medicine, Toho University School of Medicine
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Abstract
PURPOSE To develop a serum-free mass culture system for mouse keratocytes. METHODS Corneas of C57BL6/J mice were enzyme digested after the epithelium and endothelium were removed. Stromal cells were cultured in serum-free DMEM/F12 (1:1) containing epidermal growth factor (EGF), fibroblast growth factor 2 (FGF2), and B27 supplement. Primary spheres were dissociated by trypsin and subcultured as suspended secondary spheres. Cells from postnatal day (P)6 to P10 spheres were subcultured onto plastic dishes or type I collagen gels for phenotype analysis. The expression of the keratocyte markers keratocan, aldehyde dehydrogenase (Aldh), and CD34, were analyzed by RT-PCR, and vimentin and alpha-smooth muscle actin (alpha-SMA) were examined by immunocytochemistry. RESULTS Primary keratocytes formed spheres, which were cultured for over 12 passages. Suspended sphere cells expressed vimentin, keratocan, CD34, and lumican, but were negative for cytokeratin K12 (K12) and Pax6. Sphere cells subcultured on plastic exhibited a dendritic morphology characteristic of keratocytes, and maintained keratocan, Aldh, and CD34 expression in serum-free medium. Sphere cells subcultured with 10% serum became fibroblastic, and expressed alpha-SMA when stimulated by transforming growth factor (TGF)-beta. alpha-SMA-positive cells demonstrated contractile properties on collagen gels, compatible with the myofibroblast phenotype. CONCLUSIONS The phenotype of mouse keratocytes can be maintained in vitro for more than 12 passages by the serum-free sphere culturing technique.
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Affiliation(s)
- Satoru Yoshida
- Cornea Center and Departmernt of Ophthalmology, Tokyo Dental College, Chiba, Japan
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Shimmura S, Miyashita H, Konomi K, Shinozaki N, Taguchi T, Kobayashi H, Shimazaki J, Tanaka J, Tsubota K. Transplantation of corneal endothelium with Descemet's membrane using a hyroxyethyl methacrylate polymer as a carrier. Br J Ophthalmol 2005; 89:134-7. [PMID: 15665339 PMCID: PMC1772492 DOI: 10.1136/bjo.2004.050591] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
AIMS To evaluate the histology and function of Descemet's membrane transplanted with intact endothelium. METHODS Japanese white rabbits and human eyebank eyes were used as donors and recipients of Descemet's membrane transplantation. Donor endothelium was hydrodissected by injecting indocyanine green from a limbal incision, and then processed as a corneal scleral button. A 6 mm diameter donor sheet was trephined, and folded in half using a 6 mm diameter polymer as a carrier. Recipient endothelium was also hydrodissected from the limbus using trypan blue to stain the Descemet's membrane. Continuous curvilinear descemetorhexis (CCD) was performed to remove a circular section of the Descemet's membrane using a 27 gauge cystotome. Donor tissue was inserted into the anterior chamber through a 5 mm limbal incision and apposed to the host stroma. Polymers were removed following transplantation. Similar surgical procedures were performed in both rabbits and eyebank eyes. Haematoxylin eosin stains were performed after 28 days in rabbits, and eyebank eyes were fixed immediately following surgery for endothelial cell counts. RESULTS Rabbit control eyes demonstrated stromal oedema caused by loss of Descemet's membrane, whereas transplanted eyes had clear corneas. The mean (standard deviation) pachymetry of operated eyes was 376.6 (SD 32.5) mum compared with 389.6 (SD 25.1) mum in the unoperated eye. Mean endothelial density immediately following surgery in eyebank eyes was 2749 (SD 288) cells/mm(2). CONCLUSIONS Transplantation of Descemet's membrane by CCD produces a functional graft with an optically clear interface similar to control cornea.
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Affiliation(s)
- S Shimmura
- Department of Opthalmology, Toyko Dental College, 5-11-13 Sugano, Ichikiawa, Chiba 272-8513, Japan.
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Shimazaki J, Shinozaki N, Shimmura S, Holland EJ, Tsubota K. Efficacy and safety of international donor sharing: a single-center, case-controlled study on corneal transplantation. Transplantation 2004; 78:216-20. [PMID: 15280681 DOI: 10.1097/01.tp.0000128329.28962.4a] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
BACKGROUND To overcome the shortage of donor corneas, we are currently using donor corneas supplied by foreign eye banks. This single-center, case-controlled study was conducted to show the efficacy and safety of corneal transplantation using corneas from foreign donors. METHODS A retrospective, case-controlled comparison of 118 corneal transplants using foreign donor corneas (foreign group) and domestic donor corneas (domestic group) was performed. The two groups were matched according to original disease, age, severity of preoperative neovascularization, and history of previous grafting. Clinical outcome and incidence of postoperative complications were compared between the two groups. RESULTS The foreign group had a longer preservation-to-operation time than the domestic group, reflecting the longer transportation time. However, the incidence of clear grafts and postoperative complications such as immunologic rejection, infection, and glaucoma was not significantly different between the two groups. CONCLUSIONS Corneal transplantations using foreign donor corneas are as effective and safe as those using domestic donor corneas, despite the longer preservation time.
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Affiliation(s)
- Jun Shimazaki
- The Department of Ophthalmology, Tokyo Dental College, 5-11-13 Sugano, Ichikawa-shi, Chiba 272-8513, Japan.
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Suuronen E, Nakamura M, Watsky M, Stys P, Müller L, Munger R, Shinozaki N, Griffith M. Innvervated human corneal equivalents as in vitro models for nerve-target cell interactions. Am J Ophthalmol 2004. [DOI: 10.1016/j.ajo.2004.02.091] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Shimmura S, Doillon CJ, Griffith M, Nakamura M, Gagnon E, Usui A, Shinozaki N, Tsubota K. Collagen-poly(N-isopropylacrylamide)-based membranes for corneal stroma scaffolds. Cornea 2004; 22:S81-8. [PMID: 14703712 DOI: 10.1097/00003226-200310001-00012] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
PURPOSE To investigate the feasibility of using the biocompatibility of collagen-based blended biomaterials as cell-delivery systems in ocular surface reconstruction in vivo. METHODS Collagen-based composites that were blended with synthetic acrylamide-based polymers [poly(N-isopropylacrylamide), pNIPAAm] were transplanted into corneal pockets of white rabbits, with a 3-mm epithelial window. Epithelial cells were allowed to migrate onto the polymer. Transplanted eyes were examined daily for up to 30 days, after which animals were killed for histologic examination. Immunohistochemistry was performed for vimentin, alpha-smooth muscle actin (alpha-SMA), CD4, and CD8. Gold-chloride staining was performed to observe neuronal regrowth. Human amniotic membranes (AMs) and sham-operated corneas served as controls. All animals received topical antibiotics (levofloxacin) without the use of steroids or other immunosuppressive agents. RESULTS The pNIPAAm polymer allowed smooth epithelialization of the cornea, which was similar to the epithelialization observed in sham controls and AM-transplanted eyes. Histology revealed that epithelium overlying the polymer was bundled into several layers, without the orientation observed with AM and sham controls. The polymer gradually thinned and was gradually replaced by host tissue. Vimentin- and alpha-SMA-positive cells were found in stromal pockets up to 1 month following polymer transplantation. These cells were responsible for slight subepithelial haze near the wound edge. CD4- and CD8-positive lymphocytes were also observed in the vicinity of the polymer. Gold-chloride staining showed nerve regrowth in the wound edge after 1 month and subepithelial branches after 3 months. CONCLUSION Collagen-pNIPAAm blended polymers may be effective as biomaterials to be used in the early stages of lamellar stromal replacement
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Affiliation(s)
- Shigeto Shimmura
- Department of Ophthalmology, Tokyo Dental College, Ichikawa General Hospital Cornea Center, Ichikawa, Chiba, Japan.
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Suuronen EJ, Nakamura M, Watsky MA, Stys PK, Müller LJ, Munger R, Shinozaki N, Griffith M. Innervated human corneal equivalents as in vitro models for nerve‐target cell interactions. FASEB J 2003; 18:170-2. [PMID: 14597567 DOI: 10.1096/fj.03-0043fje] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
A sensory nerve supply is crucial for optimal tissue function. However, the mechanisms for successful innervation and the signaling pathways between nerves and their target tissue are not fully understood. Engineered tissue substitutes can provide controllable environments in which to study tissue innervation. We have therefore engineered human corneal substitutes that promote nerve in-growth in a pattern similar to in vivo re-innervation. We demonstrate that these nerves (a) are morphologically equivalent to natural corneal nerves; (b) make appropriate contact with target cells; (c) can generate action potentials; (d) respond to chemical and physical stimuli; and (e) play an important role in the overall functioning of the bioengineered tissue. This model can be used for studying the more general topics of nerve ingrowth or regeneration and the interaction between nerves and their target cells and, more specifically, the role of nerves in corneal function. This model could also be used as an in vitro alternative to animals for safety and efficacy testing of chemicals and drugs.
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Affiliation(s)
- Erik J Suuronen
- University of Ottawa Eye Institute, Ottawa Health Research Institute-Vision Centre, and Department of Cellular and Molecular Medicine, University of Ottawa, Ottawa, Ontario, Canada
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30
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Shinozaki N. [The problem of world population trends following the World Population Conference: a discussion based on U.N. data]. Jinko Mondai Kenkyu 2002:1-15. [PMID: 12155078] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/26/2023]
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31
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Shinozaki N. [The problems of aged population from the regional point of view]. Jinko Mondai Kenkyu 2002:1-23. [PMID: 12155079] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/26/2023]
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32
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Shinozaki N. [Discussion on population policies of Japan in 1927 (author's transl)]. Jinko Mondai Kenkyusho Nenpo 2002:7-10. [PMID: 12336301] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/26/2023]
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Griffith M, Hakim M, Shimmura S, Watsky MA, Li F, Carlsson D, Doillon CJ, Nakamura M, Suuronen E, Shinozaki N, Nakata K, Sheardown H. Artificial human corneas: scaffolds for transplantation and host regeneration. Cornea 2002; 21:S54-61. [PMID: 12484700 DOI: 10.1097/01.ico.0000263120.68768.f8] [Citation(s) in RCA: 90] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
PURPOSE To review the development of artificial corneas (prostheses and tissue equivalents) for transplantation, and to provide recent updates on our tissue-engineered replacement corneas. METHODS Modified natural polymers and synthetic polymers were screened for their potential to replace damaged portions of the human cornea or the entire corneal thickness. These polymers, combined with cells derived from each of the three main corneal layers or stem cells, were used to develop artificial corneas. Functional testing was performed in vitro. Trials of biocompatibility and immune and inflammatory reactions were performed by implanting the most promising polymers into rabbit corneas. RESULTS Collagen-based biopolymers, combined with synthetic crosslinkers or copolymers, formed effective scaffolds for developing prototype artificial corneas that could be used as tissue replacements in the future. We have previously developed an artificial cornea that mimicked key morphologic and functional properties of the human cornea. The addition of synthetic polymers increased its toughness as it retained transparency and low light scattering, making the matrix scaffold more suitable for transplantation. These new composites were implanted into rabbits without causing any acute inflammation or immune response. We have also fabricated full-thickness composites that can be fully sutured. However, the long-term effects of these artificial corneas need to be evaluated. CONCLUSIONS Novel tissue-engineered corneas that comprise composites of natural and synthetic biopolymers together with corneal cell lines or stem cells will, in the future, replace portions of the cornea that are damaged. Our results provide a basis for the development of both implantable temporary and permanent corneal replacements.
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Affiliation(s)
- May Griffith
- University of Ottawa Eye Institute, University of Ottawa, Ontario, Canada.
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Abstract
PURPOSE To report one successful case of conjunctival-limbal allograft for the treatment of a severe ocular surface disorder. METHODS Interventional case report. A 9-year-old patient suffering from Stevens-Johnson syndrome with total keratinization of the ocular surface of both eyes was treated in the left eye by corneal and conjunctival stem cell transplantation. Oral cyclosporin A and topical autologous serum and corticosteroids were administered. RESULTS Mucosal epithelial phenotype was maintained in the left eye at most recent examination for more than 3 years after ocular surface reconstruction. CONCLUSION A total keratinized ocular surface may be treated with the combination of conjunctival and corneal stem cell transplantation.
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Affiliation(s)
- Kazuo Tsubota
- Department of Ophthalmology, Tokyo Dental College, Ichikawa-shi, Chiba, Japan.
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Shiroza T, Shibata Y, Hayakawa M, Shinozaki N, Fukushima K, Udaka S, Abiko Y. Construction of a chimeric shuttle plasmid via a heterodimer system: secretion of an scFv protein from Bacillus brevis cells capable of inhibiting hemagglutination. Biosci Biotechnol Biochem 2001; 65:389-95. [PMID: 11302174 DOI: 10.1271/bbb.65.389] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Passive immunization is an attractive therapy for preventing oral diseases including dental caries and periodontal disease. For this purpose, we attempted to produce a single chain variable fragment, scFv, which inhibited hemagglutination using the Bacillus brevis protein-producing system. To accomplish this, a novel strategy, a heterodimer system, was used for the construction of a chimeric shuttle plasmid. Initially, a set of new plasmids, kanamycin-resistant donor and erythromycin-resistant general cloning plasmids, were constructed. p15A ori was a common replication origin in these plasmids, while the pUB110 rep and minus origin (MO) were cloned into the donor plasmid. Next, the secretion domain of the B. subtilis alpha-amylase gene and the G2-4 gene, coding for the scFv protein, were cloned into the general cloning plasmid and fused by PCR. Both the donor plasmid and the general cloning plasmid containing the fused gene were digested with NotI and them ligated, a dimeric plasmid being constructed. The key restriction sites, AscI, are arranged such that the pUB110 rep-MO moiety was switched from the donor to the general cloning plasmid following AscI digestion. The chimeric shuttle plasmid was readily constructed by simple re-circularization and a B. brevis transformant producing the scFv protein in the culture fluid was isolated.
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Affiliation(s)
- T Shiroza
- Department of Biochemistry, Nihon University School of Dentistry at Matsudo, Chiba, Japan.
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Abstract
The present study addresses the separate activities of frontal and temporal MMN generators which might be differentially affected by a change in the probability of standard stimuli. As the probability of standard stimuli was increased, the frontal MMN component significantly increased in amplitude, while the temporal one was not affected. Correspondingly, the scalp current density (SCD) maps showed that the temporal MMN generator was activated even at low probability of standard stimuli, suggesting that even the weak memory trace could start the automatic mismatch process, whereas the frontal MMN generator was activated only with increased probabilities of standard stimuli, suggesting that the stronger the memory trace is, the easier it might trigger the involuntary switching of attention to stimulus change.
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Affiliation(s)
- Y Sato
- Department of Neuropsychiatry, Hirosaki University School of Medicine, Hirosaki, Japan
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Shinozaki N. [The day surgery system]. Nihon Geka Gakkai Zasshi 2000; 101:708-12. [PMID: 11107595] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/18/2023]
Abstract
The day surgery system was established in order to satisfy the demand of healthy patients, and we have performed more than 40 types of operation under this system so far. The critical path is an indispensable tool for ensuring safety and efficiency, and the care coordinator is the key person to manage the system for that purpose. In addition, the cost management technique focusing on DRG/PPS and risk management to increase patient satisfaction are particularly important because we must manage numerous surgical cases. The day surgery system is evaluated in relation to the primary education program for surgeons. Such education not only impacts medical and surgical skills, but also is a good opportunity for training in the basic bedside manner to offer the best service to patients.
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Affiliation(s)
- N Shinozaki
- Day Surgery Center Shonan Kamakura General Hospital, Japan
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Nashida T, Yabe H, Sato Y, Hiruma T, Sutoh T, Shinozaki N, Kaneko S. Automatic auditory information processing in sleep. Sleep 2000; 23:821-8. [PMID: 11007449] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/17/2023] Open
Abstract
STUDY OBJECTIVES The mismatch negativity (MMN) component of the event-related potentials reflects the automatic detection of sound change. Only a few researchers have investigated the MMN elicitation during sleep in adult human and some of them reported that MMN amplitude was decreased in sleep compared to in waking. However, it is not clear that the decrease of MMN amplitude was due to increased drowsiness or long-term response decrement. Two experiments were conducted to clarify whether or not the MMN was elicited in each sleep stage. We presented auditory stimuli to subjects continuously from waking until sleep state (Experiment 1). Using the same experimental condition, we examined whether or not MMN amplitude was influenced by long-term stimulus presentation (80min.) and by vigilance level (Experiment 2). DESIGN N/A SETTING: N/A PARTICIPANTS: N/A INTERVENTIONS: N/A MEASUREMENTS & RESULTS: Experiment 1: MMN was obtained in both drowsiness and REM sleep. MMN was significantly smaller in amplitude and shorter in latency in the both stages than in the waking state. However, MMN was not found in another sleep stage. Experiment 2: Amplitudes were no different among 0-20 min., 20-40 min., 60-80 min. But it was decreased in 40-60 min. and power value of alpha-wave was decreased in 40-60 min. CONCLUSIONS To obtain the reliable data, by using the automatic spectral analysis, we confirmed that MMN was elicited in REM sleep. MMN was not influenced by long-term stimulation. The result suggested that auditory stimuli could be processed in the pre-attentive sensory memory even in REM sleep.
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Affiliation(s)
- T Nashida
- Department of Neuropsychiatry, Hirosaki University School of Medicine, Japan.
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Abstract
To investigate a part of the structure of the memory trace, auditory event-related potentials (ERPs) were recorded from reading subjects while they were presented with two different stimulus-series simultaneously. A clear mismatch negativity (MMN) was obtained from each series, when the stimulus sequence consisted of a high-frequency series and a low-frequency series. Moreover, the MMN showed independent elicitation within each series. However, if the frequency range of one series overlapped with that of the other series, the amplitude of the MMN was prominently reduced, suggesting that the two processing functions indexed by MMN coexisted simultaneously in the preattentive acoustic system and were produced by the respective grouping of high-frequency tones and low-frequency tones.
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Affiliation(s)
- N Shinozaki
- Department of Neuropsychiatry, Hirosaki University School of Medicine, Japan
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Nakamura Y, Shinozaki N, Hirasawa M, Kato R, Shiraishi K, Kida H, Usuda K, Ishikawa T. Prevalence of migraine and Raynaud's phenomenon in Japanese patients with vasospastic angina. Jpn Circ J 2000; 64:239-42. [PMID: 10783043 DOI: 10.1253/jcj.64.239] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
The prevalence of migraine and Raynaud's phenomenon in Japanese patients with vasospastic angina (group I) were compared with those in 2 control groups: one with effort angina (group II) and the other group without known ischemic heart disease (group III). There were no significant differences among the 3 groups with respect to age and sex. The prevalence of migraine in group I was 23 of 100, as compared with 4 of 100 in group II (p<0.01) and 11 of 100 in group III (p<0.05). The prevalence of Raynaud's phenomenon in group I was 9 of 100, as compared with 3 of 100 in group II and 4 of 100 in group III. Thus, in Japan, the prevalence of migraine in patients with vasospastic angina was higher than those in the 2 control groups, whereas the prevalence of Raynaud's phenomenon did not differ significantly among the 3 groups. The prevalence of Raynaud's phenomenon in Japanese patients with vasospastic angina was different from that reported from North America, although the prevalence of migraine was the same. This may be partially explained by racial differences.
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Affiliation(s)
- Y Nakamura
- Department of Cardiology, Kanazawa National Hospital, Japan.
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Nanbu A, Hayakawa M, Takada K, Shinozaki N, Abiko Y, Fukushima K. Production, characterization, and application of monoclonal antibodies which distinguish four glucosyltransferases from Streptococcus sobrinus. FEMS Immunol Med Microbiol 2000; 27:9-15. [PMID: 10617784 DOI: 10.1111/j.1574-695x.2000.tb01405.x] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A 1,3-alpha-glucan synthase (GTF-I), a highly branched 1, 6-alpha-glucan synthase (GTF-U) and a 1,6-alpha-glucan synthase (GTF-T) were purified to near homogeneity from the culture fluid of Streptococcus sobrinus strain B13N (serotype d) and characterized. In addition, a crude preparation of a recombinant oligo-isomaltosaccharide synthase (rGTF-S) was prepared from a cell-free extract of Escherichia coli MD124 transformant. Using four homogeneous GTF preparations including previously purified rGTF-S as antigens for immunization, 11 murine hybridomas producing a monoclonal antibody (MAb) were established through the fusion of myeloma cells (P3X63-Ag8-U1) and spleen cells of immunized BALB/c mice. When the immunoreactivities of the resultant MAbs were tested, all five MAbs raised against GTF-I, all three MAbs raised against GTF-T, and two of three MAbs raised against GTF-U reacted specifically with the homologous enzyme alone, while one MAb (B86) raised against GTF-U cross-reacted strongly with all GTFs. Although no MAb monospecific for rGTF-S was obtained, precise recognition of GTF-S was possible using the nonspecific B86 antibody together with the MAbs monospecific for the three glucan synthases. Thus, a set of four typical MAbs (B17, B76, B19 and B86) were successfully used for the identification of gene products expressed in 24 previously constructed E. coli phage clones, and the findings suggested that six phage clones might express a gtfU gene encoding GTF-U which has not been hitherto isolated.
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Affiliation(s)
- A Nanbu
- Department of Microbiology, Nihon University School of Dentistry at Matsudo, Chiba, Japan
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Sato Y, Yabe H, Hiruma T, Sutoh T, Shinozaki N, Nashida T, Kaneko S, Saito F, Fukushima Y. The administration of neuroleptic drugs decreased the arousal level, as reflected in a reduction of early CNV amplitude. Schizophr Res 1999; 40:84-6. [PMID: 10541012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/14/2023]
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Shimazaki J, Kaido M, Shinozaki N, Shimmura S, Munkhbat B, Hagihara M, Tsuji K, Tsubota K. Evidence of long-term survival of donor-derived cells after limbal allograft transplantation. Invest Ophthalmol Vis Sci 1999; 40:1664-8. [PMID: 10393033] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/13/2023] Open
Abstract
PURPOSE Severe destruction of the corneal limbus causes conjunctival invasion and subsequent visual loss. Limbal allograft transplantation (LAT) was recently proposed for the treatment of these disorders. However, whether the method functions as a stem cell transplantation of the corneal epithelium remains unclear. This study provided evidence that donor-derived corneal epithelial cells survive long after LAT. METHODS Epithelial cells on the paracentral cornea in patients who have undergone LAT were subjected to fluorescence in situ hybridization (FISH) and polymerase chain reaction restriction fragment length polymorphism (RFLP) analysis. X and Y chromosomes were detected using sex chromosome-specific probes in the FISH analysis, and HLA-DPBI antigens were examined in the RFLP analysis. Eyes receiving conventional penetrating keratoplasty (PKP) served as controls. RESULTS Donor-derived epithelial cells were detected in three of five eyes (60.0%) in the FISH analysis and in seven of nine eyes (77.8%) in the RFLP analysis. Among these eyes, one and three eyes in the FISH and RFLP analysis, respectively, had both donor- and recipient-derived cells. In control PKP eyes, none of the eyes in the FISH analysis and one of eight eyes (12.5%) in the RFLP analysis had donor-derived cells. CONCLUSIONS These results suggest that donor-derived cells survive much longer after LAT than those after PKP, and that LAT may function as stem cell transplantation of the corneal epithelium.
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Affiliation(s)
- J Shimazaki
- Department of Ophthalmology, Tokyo Dental College, Chiba, Ichikawa, Japan
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Tsubota K, Satake Y, Kaido M, Shinozaki N, Shimmura S, Bissen-Miyajima H, Shimazaki J. Treatment of severe ocular-surface disorders with corneal epithelial stem-cell transplantation. N Engl J Med 1999; 340:1697-703. [PMID: 10352161 DOI: 10.1056/nejm199906033402201] [Citation(s) in RCA: 313] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
BACKGROUND Conditions that destroy the limbal area of the peripheral cornea, such as the Stevens-Johnson syndrome, ocular pemphigoid, and chemical and thermal injuries, can deplete stem cells of the corneal epithelium. The result is scarring and opacification of the normally clear cornea. Standard corneal transplantation cannot treat this form of functional blindness. METHODS We performed and evaluated 70 transplantations of corneal epithelial stem cells from cadaveric eyes into 43 eyes of 39 patients with severe ocular-surface disorders and limbal dysfunction. Medical treatment had failed in all patients. The patients had a mean preoperative visual acuity of 0.004 (only being able to count the number of fingers presented by the examiner) in the affected eyes, which satisfies the criteria for legal blindness in most countries. In 28 eyes, we also performed standard corneal transplantation. Stem-cell transplantations were performed as many as four times on 1 eye if the initial results were not satisfactory; 19 eyes had multiple transplantations. Patients were followed for at least one year after transplantation. RESULTS A mean of 1163 days after stem-cell transplantation, 22 of the 43 eyes (51 percent) had corneal epithelialization; of the 22 eyes, 7 eyes had corneal stromal edema and 15 eyes had clear corneas. Mean visual acuity improved from 0.004 to 0.02 (vision sufficient to distinguish the largest symbol on the visual-acuity chart from a distance of 1 m) (P<0.001). The 15 eyes in which the cornea remained clear had a final mean visual acuity of 0.11 (the ability to distinguish the largest symbol from a distance of 5 m). Complications of the first transplantation included persistent defects in the corneal epithelium in 26 eyes, ocular hypertension in 16 eyes, and rejection of the corneal graft in 13 of 28 eyes. The epithelial defects eventually healed in all but two of the eyes. CONCLUSIONS Transplantation of corneal epithelial stem cells can restore useful vision in some patients with severe ocular-surface disorders.
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Affiliation(s)
- K Tsubota
- Department of Ophthalmology, Tokyo Dental College, Chiba, Japan.
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Yabe H, Sato Y, Sutoh T, Hiruma T, Shinozaki N, Nashida T, Saito F, Kaneko S. The duration of the integrating window in auditory sensory memory. Electroencephalogr Clin Neurophysiol Suppl 1999; 49:166-9. [PMID: 10533103] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/13/2023]
Affiliation(s)
- H Yabe
- Department of Neuropsychiatry, Hirosaki University School of Medicine, Japan
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Abstract
We studied event-related potentials (ERPs) produced in response to deviant stimuli in a sequence of somatosensory stimuli which were measured under stimulus-ignoring conditions. A change in the repetitive somatosensory input elicited not only a frontal negativity which was similar to the somatosensory mismatch negativity very recently reported by Kekoni et al. [J. Kekoni, H. Hämäläinen, M. Saarinen, J. Gröhn, K. Reinikainen, A. Lehtokoski, R. Näätänen, Rate effect and mismatch responses in the somatosensory system: ERP-recordings in humans, Biol. Psychol. 46 (1997) 125-142] but also a positive deflection ranging in latency from 100 to 200 ms. This somatosensory change-related positivity was reduced with prolongation of the interstimulus interval (ISI) and was different from the responses to the deviant stimuli when they were presented alone. These findings suggest that the somatosensory change-related positivity is probably generated not by activation of new afferent elements but by a detection of change in a process of comparison with sensory memory.
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Affiliation(s)
- N Shinozaki
- Department of Neuropsychiatry, Hirosaki University School of Medicine, Zaifu-cho 5, Hirosaki 036, Japan.
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Tomita Y, Watanabe T, Takeuchi T, Nanbu A, Shinozaki N, Ikemi T, Fukushima K. Effects of surfactants on glucosyltransferase production and in vitro sucrose-dependent colonization by Streptococcus mutans. Arch Oral Biol 1998; 43:735-40. [PMID: 9783828 DOI: 10.1016/s0003-9969(98)00065-x] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/09/2023]
Abstract
The presence of Tween 80 in media was associated with a significant increase in three glucosyltransferases(GTFs)(I, SI and S), especially GTF-I, produced by Streptococcus mutans strain PS14, indicating that the surfactant is a major cause of the enhanced GTF production observed in cultures in M4 medium. Lecithin and Tween 20 also enhanced GTF-I production, while Triton X-100 depressed it. At a lot concentration of 0.00125%, Tween 80 enhanced markedly only GTF-I production and its effect reached maximum at a concentration of 0.0025%. Water-insoluble glucan synthesis and artificial plaque formation (in vitro sucrose-dependent colonization) by PS14 were significantly enhanced by the addition of Tween 80 at concentrations over 0.00125%. These results suggest that surfactants might vary the cariogenic potential of Strep. mutans even at low concentrations.
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Affiliation(s)
- Y Tomita
- Department of Operative Dentistry, Nihon University School of Dentistry at Matsudo, Chiba, Japan
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Suto N, Mikuniya A, Okubo T, Hanada H, Shinozaki N, Okumura K. Nitric oxide modulates cardiac contractility and oxygen consumption without changing contractile efficiency. Am J Physiol 1998; 275:H41-9. [PMID: 9688894 DOI: 10.1152/ajpheart.1998.275.1.h41] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Nitric oxide (NO) affects myocardial contractility and myocardial oxygen consumption (MVO2) in vitro. In alpha-chloralose-anesthetized dogs instrumented for the measurements of left ventricular (LV) pressure, LV volume using a conductance catheter, coronary blood flow, and coronary venous oxygen saturation (ScvO2) using a fiber-optic catheter, LV end-systolic pressure-volume relationships (ESPVR) and the relationship between MVO2 and LV pressure-volume area (PVA) were analyzed before and after intravenous infusions of the NO synthase inhibitor NG-monomethyl-L-arginine acetate (L-NMMA; 5 mg/kg, 8 dogs) and the NO substrate L-arginine (600 mg/kg, 7 dogs). L-NMMA increased the slope of the ESPVR (Emax) (P < 0.05) without changing contractile efficiency indicated by the inverse of the slope of the MVO2-PVA line. L-NMMA also increased unloaded MVO2, indicated by the y-axis intercept of the MVO2-PVA line (P < 0.05). In contrast, L-arginine decreased Emax (P < 0.05) while decreasing MVO2 (P < 0.05), and without changing contractile efficiency. The basal oxygen metabolism was not affected by L-NMMA and L-arginine. These data imply that endogenous NO spares MVO2 by reducing oxygen use in excitation-contraction coupling and attenuates cardiac contractility without changing contractile efficiency.
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Affiliation(s)
- N Suto
- Second Department of Internal Medicine, Hirosaki University School of Medicine, Hirosaki University, Hirosaki 036, Japan
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Fujishima H, Shimazaki J, Shinozaki N, Tsubota K. Trabeculectomy With the Use of Amniotic Membrane for Uncontrollable Glaucoma. Ophthalmic Surg Lasers Imaging Retina 1998. [DOI: 10.3928/1542-8877-19980501-12] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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