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Jonas E, Sjöqvist S, Elbe P, Kanai N, Enger J, Haas SL, Mohkles-Barakat A, Okano T, Takagi R, Ohki T, Yamamoto M, Kondo M, Markland K, Lim ML, Yamato M, Nilsson M, Permert J, Blomberg P, Löhr JM. Transplantation of tissue-engineered cell sheets for stricture prevention after endoscopic submucosal dissection of the oesophagus. United European Gastroenterol J 2016; 4:741-753. [PMID: 28408991 DOI: 10.1177/2050640616631205] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/06/2015] [Accepted: 01/13/2016] [Indexed: 12/21/2022] Open
Abstract
BACKGROUND AND OBJECTIVE Endoscopic mucosal dissection (ESD) is a treatment option for oesophagus tumours localized to the mucosa enabling en bloc removal of large lesions. The resulting larger mucosal defects have resulted in an increase in the occurrence of post-treatment strictures. Transplantation of autologous cell sheets, cultured from oral mucosa, has been shown to prevent post-ESD strictures. The aim of the study was to assess the efficacy and safety of cell sheet transplantation after oesophageal ESD in a Western patient population where reflux-associated pre-malignant and malignant conditions predominate. METHODS Patients with Barrett's oesophagus associated high-grade dysplasia or early adenocarcinoma where ESD entailed a resection >3 cm in length and ≥75% of the circumference were eligible for treatment under hospital exemption. Cell sheets were cultured from buccal mucosa according to Good Manufacturing Practice and were endoscopically applied to the post-ESD defect directly after resection. Patients were followed with weekly endoscopy examinations, including confocal laser microscopy, for a total of four weeks. RESULTS Five patients were treated. ESD was extensive with resections being circumferential in three patients and 9-10 cm in length in two. The number of transplanted cell sheets ranged from two to six. Three patients developed strictures requiring two to five dilatation sessions. CONCLUSIONS Cell sheet transplantation shows to be safe and feasible in a Western population. Results suggest that transplantation has a protective effect on the mucosal defect after ESD, decreasing both the risk for and extent of stricture formation.
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Affiliation(s)
- Eduard Jonas
- Centre for Digestive Diseases, Karolinska University Hospital, Stockholm, Sweden.,Department of Clinical Sciences, Intervention and Technology (CLINTEC), Karolinska Institutet, Stockholm, Sweden
| | - Sebastian Sjöqvist
- Advanced Centre for Translational Regenerative Medicine (ACTREM), Department of Clinical Sciences, Intervention and Technology (CLINTEC), Karolinska Institutet, Stockholm, Sweden
| | - Peter Elbe
- Centre for Digestive Diseases, Karolinska University Hospital, Stockholm, Sweden.,Department of Clinical Sciences, Intervention and Technology (CLINTEC), Karolinska Institutet, Stockholm, Sweden
| | - Nobuo Kanai
- Institute of Advanced Biomedical Engineering and Science, Tokyo Women's Medical University, Tokyo, Japan
| | - Jenny Enger
- Vecura, Clinical Research Centre, Karolinska University Hospital, Stockholm, Sweden
| | - Stephan L Haas
- Centre for Digestive Diseases, Karolinska University Hospital, Stockholm, Sweden
| | | | - Teruo Okano
- Institute of Advanced Biomedical Engineering and Science, Tokyo Women's Medical University, Tokyo, Japan
| | - Ryo Takagi
- Institute of Advanced Biomedical Engineering and Science, Tokyo Women's Medical University, Tokyo, Japan
| | - Takeshi Ohki
- Institute of Advanced Biomedical Engineering and Science, Tokyo Women's Medical University, Tokyo, Japan.,Department of Surgery, Institute of Gastroenterology, Tokyo Women's Medical University, Tokyo, Japan
| | - Masakazu Yamamoto
- Department of Surgery, Institute of Gastroenterology, Tokyo Women's Medical University, Tokyo, Japan
| | - Makoto Kondo
- Centre for Haematology and Regenerative Medicine (HERM), Karolinska Institutet, Stockholm, Sweden
| | - Katrin Markland
- Vecura, Clinical Research Centre, Karolinska University Hospital, Stockholm, Sweden
| | - Mei Ling Lim
- Advanced Centre for Translational Regenerative Medicine (ACTREM), Department of Clinical Sciences, Intervention and Technology (CLINTEC), Karolinska Institutet, Stockholm, Sweden
| | - Masayuki Yamato
- Institute of Advanced Biomedical Engineering and Science, Tokyo Women's Medical University, Tokyo, Japan
| | - Magnus Nilsson
- Centre for Digestive Diseases, Karolinska University Hospital, Stockholm, Sweden.,Department of Clinical Sciences, Intervention and Technology (CLINTEC), Karolinska Institutet, Stockholm, Sweden
| | - Johan Permert
- Department of Clinical Sciences, Intervention and Technology (CLINTEC), Karolinska Institutet, Stockholm, Sweden.,Innovation Office, Karolinska University Hospital, Stockholm, Sweden
| | - Pontus Blomberg
- Vecura, Clinical Research Centre, Karolinska University Hospital, Stockholm, Sweden.,Department of Laboratory Medicine, Karolinska Institutet, Stockholm, Sweden
| | - J-Matthias Löhr
- Centre for Digestive Diseases, Karolinska University Hospital, Stockholm, Sweden.,Department of Clinical Sciences, Intervention and Technology (CLINTEC), Karolinska Institutet, Stockholm, Sweden
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Hallengärd D, Bråve A, Isaguliants M, Blomberg P, Enger J, Stout R, King A, Wahren B. A combination of intradermal jet-injection and electroporation overcomes in vivo dose restriction of DNA vaccines. Genet Vaccines Ther 2012; 10:5. [PMID: 22873174 PMCID: PMC3532290 DOI: 10.1186/1479-0556-10-5] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/12/2012] [Accepted: 07/12/2012] [Indexed: 01/04/2023]
Abstract
Background The use of optimized delivery devices has been shown to enhance the potency of DNA vaccines. However, further optimization of DNA vaccine delivery is needed for this vaccine modality to ultimately be efficacious in humans. Methods Herein we evaluated antigen expression and immunogenicity after intradermal delivery of different doses of DNA vaccines by needle or by the Biojector jet-injection device, with or without the addition of electroporation (EP). Results Neither needle injection augmented by EP nor Biojector alone could induce higher magnitudes of immune responses after immunizations with a high dose of DNA. After division of a defined DNA dose into multiple skin sites, the humoral response was particularly enhanced by Biojector while cellular responses were particularly enhanced by EP. Furthermore, a close correlation between in vivo antigen expression and cell-mediated as well as humoral immune responses was observed. Conclusions These results show that two optimized DNA vaccine delivery devices can act together to overcome dose restrictions of plasmid DNA vaccines.
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Affiliation(s)
- David Hallengärd
- Department of Microbiology, Tumor and Cell Biology, Karolinska Institute, Nobels väg 16, 171 77, Stockholm, Sweden.
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Abstract
We have developed a method, using laser, optical tweezers and direct microscopic analysis of reproductive potential and membrane integrity, to assess single-cell viability in a stationary-phase Escherichia coli population. It is demonstrated here that a reduction in cell integrity, determined by using the fluorescent nucleic acid stain propidium iodide, correlated well with a reduction in cell proliferating potential during the stationary-phase period studied. Moreover, the same cells that exhibited reduced integrity were found to be the ones that failed to divide upon nutrient addition. A small but significant number of the intact cells (496 of 7,466 [6.6%]) failed to replicate. In other words, we did not find evidence for the existence of a large population of intact but nonculturable cells during the stationary-phase period studied but it is clear that reproductive ability can be lost prior to the loss of membrane integrity. In addition, about 1% of the stationary-phase cells were able to divide only once upon nutrient addition, and in a few cases, only one of the two cells produced by division was able to divide a second time, indicating that localized cell deterioration, inherited by only one of the daughters, may occur. The usefulness of the optical trapping methodology in elucidating the mechanisms involved in stationary-phase-induced bacterial death and population heterogeneity is discussed.
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Affiliation(s)
- M Ericsson
- Department of Physics, Chalmers University of Technology and Göteborg University, Göteborg, Sweden
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