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Sartoneva R, Nordback PH, Haimi S, Grijpma DW, Lehto K, Rooney N, Seppänen-Kaijansinkko R, Miettinen S, Lahdes-Vasama T. Comparison of Poly(l-lactide-co-ɛ-caprolactone) and Poly(trimethylene carbonate) Membranes for Urethral Regeneration: An In Vitro and In Vivo Study. Tissue Eng Part A 2017; 24:117-127. [PMID: 28463605 DOI: 10.1089/ten.tea.2016.0245] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
Urethral defects are normally reconstructed using a patient's own genital tissue; however, in severe cases, additional grafts are needed. We studied the suitability of poly(l-lactide-co-ɛ-caprolactone) (PLCL) and poly(trimethylene carbonate) (PTMC) membranes for urethral reconstruction in vivo. Further, the compatibility of the materials was evaluated in vitro with human urothelial cells (hUCs). The attachment and viability of hUCs and the expression of different urothelial cell markers (cytokeratin 7, 8, 19, and uroplakin Ia, Ib, and III) were studied after in vitro cell culture on PLCL and PTMC. For the in vivo study, 32 rabbits were divided into the PLCL (n = 15), PTMC (n = 15), and control or sham surgery (n = 2) groups. An oval urethral defect 1 × 2 cm in size was surgically excised and replaced with a PLCL or a PTMC membrane or urethral mucosa in sham surgery group. The rabbits were followed for 2, 4, and 16 weeks. After the follow-up, urethrography was performed to check the patency of the urethra. The defect area was excised for histological examination, where the epithelial integrity and structure, inflammation, and fibrosis were observed. There was no notable difference on hUCs attachment on PLCL and PTMC membranes after 1 day of cell seeding, further, the majority of hUCs were viable and maintained their urothelial phenotype on both biomaterials. Postoperatively, animals recovered well, and no severe strictures were discovered by urethrography. In histological examination, the urothelial integrity and structure developed toward a normal urothelium with only mild signs of fibrosis or inflammation. According to these results, PLCL and PTMC are both suitable for reconstructing urethral defects. There were no explicit differences between the PLCL and PTMC membranes. However, PTMC membranes were more flexible, easier to suture and shape, and developed significant epithelial integrity.
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Affiliation(s)
- Reetta Sartoneva
- 1 Adult Stem Cell Research Group, BioMediTech, Faculty of Medicine and Life Sciences, University of Tampere , Tampere, Finland .,2 Science Centre, Tampere University Hospital , Tampere, Finland
| | - Panu H Nordback
- 1 Adult Stem Cell Research Group, BioMediTech, Faculty of Medicine and Life Sciences, University of Tampere , Tampere, Finland .,2 Science Centre, Tampere University Hospital , Tampere, Finland
| | - Suvi Haimi
- 3 Department of Oral and Maxillofacial Diseases, University of Helsinki and Helsinki University Hospital , Helsinki, Finland
| | - Dirk W Grijpma
- 4 Department of Biomaterials Science and Technology, MIRA Institute for Biomedical Technology and Technical Medicine, University of Twente , Enschede, The Netherlands .,5 Department of Biomedical Engineering, W.J. Kolff Institute, University Medical Centre Groningen, University of Groningen , Groningen, The Netherlands
| | - Kalle Lehto
- 1 Adult Stem Cell Research Group, BioMediTech, Faculty of Medicine and Life Sciences, University of Tampere , Tampere, Finland
| | | | - Riitta Seppänen-Kaijansinkko
- 3 Department of Oral and Maxillofacial Diseases, University of Helsinki and Helsinki University Hospital , Helsinki, Finland
| | - Susanna Miettinen
- 1 Adult Stem Cell Research Group, BioMediTech, Faculty of Medicine and Life Sciences, University of Tampere , Tampere, Finland .,2 Science Centre, Tampere University Hospital , Tampere, Finland
| | - Tuija Lahdes-Vasama
- 2 Science Centre, Tampere University Hospital , Tampere, Finland .,7 Pediatric and Adolescent Surgery Unit, Pediatric Research Centre and Tampere University Hospital , Tampere, Finland
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Ranganathan M, Balaji M, Krishnaraj R, Narayanan V, Thangavelu A. Assessment of Regeneration of Bone in the Extracted Third Molar Sockets Augmented Using Xenograft (CollaPlug TN Zimmer) in Comparison with the Normal Healing on the Contralateral Side. J Pharm Bioallied Sci 2017; 9:S180-S186. [PMID: 29284960 PMCID: PMC5731009 DOI: 10.4103/jpbs.jpbs_176_17] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Introduction: Alveolar bone resorption is a significant clinical problem. Bone loss in third molar region following extraction or surgical removal not only leads to periodontal problems in second molar region but also it may lead to some serious problems like increased incidence of angle fractures. In order to reduce the risks following third molar surgery, the socket should be augmented with bone grafts. In recent days guided tissue regeneration is the most accepted and successful technique followed many authors and its efficacy has been proved. Materials and Methods: Based upon our clinical experience, the use of bio absorbable collagen wound dressing such as CollaPlugTN has achieved quick healing and more primary wound coverage. Amongst the graft materials collagen is preferable due to its high biocompatibility and hemostatic ability. This study was done to assess the regeneration of bone in the extracted third molar sockets using xenograft (CollaPlugTN-Zimmer) which was compared with the normal healing on the contra lateral side. The assessment was done to analyze post-operative healing complications and to compare the bone density formed between control site and implant site radiologically. Conclusion: On this basis of this study, the use of collaplugTN appears to be beneficial to the patient in postoperative wound healing and also for better bone formation. The use of this material was advantageous because of its simplicity of application cost effectiveness and availability. There is enhanced wound healing and early bone formation.
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Affiliation(s)
- Murugan Ranganathan
- Department of Oral and Maxillofacial Surgery, Rajah Muthiah Dental College, Chidambaram, Tamil Nadu, India
| | - M Balaji
- Department of Dental Surgery, Dhanalakshmi Srinivasan Medical College, Perambalur, Tamil Nadu, India
| | - R Krishnaraj
- Prosthodontics, Rajah Muthiah Dental College, Chidambaram, Tamil Nadu, India
| | | | - Annamalai Thangavelu
- Department of Oral and Maxillofacial Surgery, Rajah Muthiah Dental College, Chidambaram, Tamil Nadu, India
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Meretoja VV, Tirri T, Malin M, Seppälä JV, Närhi TO. Ectopic bone formation in and soft-tissue response to P(CL/DLLA)/bioactive glass composite scaffolds. Clin Oral Implants Res 2012; 25:159-64. [DOI: 10.1111/clr.12051] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/08/2012] [Indexed: 02/01/2023]
Affiliation(s)
- Ville V. Meretoja
- Department of Prosthetic Dentistry; Institute of Dentistry; University of Turku; Turku Finland
- Turku Clinical Biomaterials Center; Turku Finland
| | - Teemu Tirri
- Department of Prosthetic Dentistry; Institute of Dentistry; University of Turku; Turku Finland
- Turku Clinical Biomaterials Center; Turku Finland
| | - Minna Malin
- Aalto University; School of Chemical Technology; Polymer Technology AALTO, Finland
| | - Jukka V. Seppälä
- Aalto University; School of Chemical Technology; Polymer Technology AALTO, Finland
| | - Timo O. Närhi
- Department of Prosthetic Dentistry; Institute of Dentistry; University of Turku; Turku Finland
- Turku Clinical Biomaterials Center; Turku Finland
- Clinic of Oral Diseases; Turku University Central Hospital; Turku Finland
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Chung S, King MW. Design concepts and strategies for tissue engineering scaffolds. Biotechnol Appl Biochem 2011; 58:423-38. [PMID: 22172105 DOI: 10.1002/bab.60] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2011] [Accepted: 09/23/2011] [Indexed: 12/11/2022]
Abstract
In the emerging field of tissue engineering and regenerative medicine, new viable and functional tissue is fabricated from living cells cultured on an artificial matrix in a simulated biological environment. It is evident that the specific requirements for the three main components, cells, scaffold materials, and the culture environment, are very different, depending on the type of cells and the organ-specific application. Identifying the variables within each of these components is a complex and challenging assignment, but there do exist general requirements for designing and fabricating tissue engineering scaffolds. Therefore, this review explores one of the three main components, namely, the key concepts, important parameters, and required characteristics related to the development and evaluation of tissue engineering scaffolds. An array of different design strategies will be discussed, which include mimicking the extra cellular matrix, responding to the need for mass transport, predicting the structural architecture, ensuring adequate initial mechanical integrity, modifying the surface chemistry and topography to provide cell signaling, and anticipating the material selection so as to predict the required rate of bioresorption. In addition, this review considers the major challenge of achieving adequate vascularization in tissue engineering constructs, without which no three-dimensional thick tissue such as the heart, liver, and kidney can remain viable.
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Affiliation(s)
- Sangwon Chung
- Fiber and Polymer Science, Department of Textile Engineering, Chemistry and Science, North Carolina State University, Raleigh, NC 27695-8301, USA
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Abstract
This review deals with the contemporary investigations of carcinogenesis induced by foreign bodies. The main attention is given to the interactions of macrophages with an implanted foreign body and their possible role in tumorigenesis.
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Affiliation(s)
- T G Moizhess
- Institute of Carcinogenesis, Blokhin Cancer Research Center, Russian Academy of Medical Sciences, Moscow, 115478, Russia.
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Hao W, Hu YY, Wei YY, Pang L, Lv R, Bai JP, Xiong Z, Jiang M. Collagen I gel can facilitate homogenous bone formation of adipose-derived stem cells in PLGA-beta-TCP scaffold. Cells Tissues Organs 2007; 187:89-102. [PMID: 17938566 DOI: 10.1159/000109946] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/25/2007] [Indexed: 01/22/2023] Open
Abstract
Cell-based tissue engineering is thought to be a new therapy for treatment of bone defects and nonunions after trauma and tumor resection. In this study, we explore the in vitro and in vivo osteogenesis of a novel biomimetic construct fabricated by using collagen I gel to suspend rabbit adipose-derived stem cells (rASCs) into a porous poly(lactic-co-glycolic)acid-beta-tricalcium phosphate (PLGA-beta-TCP) scaffold (rASCs-COL/PLGA-beta-TCP). In vitro and in vivo studies of the rASCs-COL/PLGA-beta-TCP composite (group A) were carried out compared with the single combination of rASCs and PLGA-beta-TCP (rASCs/PLGA-beta-TCP; group B), the combination of acellular collagen I gel and PLGA-beta-TCP (COL/PLGA-beta-TCP; group C), and the PLGA-beta-TCP scaffold (group D). Composites of different groups were cultured in vitro for 2 weeks in osteogenic medium and then implanted into the autologous muscular intervals for 8 weeks. After 2 weeks of in vitro culture, alkaline phosphatase activity and extracellular matrix mineralization in group A were significantly higher than in group B (p < 0.01, n = 4). In vivo osteogenesis was evaluated by radiographic and histological analyses. The calcification level was radiographically evident in group A, whereas no apparent calcification was observed in groups B, C and D (n = 4). In group A, woven bone with a trabecular structure was formed, while in group B, only osteoid tissue was observed. Meanwhile, the bone-forming area in group A was significantly higher than in group B (p < 0.01, n = 4). No bone formation was observed in groups C or D (n = 4). In conclusion, by using collagen I gel to suspend rASCs into porous PLGA-beta-TCP scaffold, osteogenic differentiation of rASCs can be improved and homogeneous bone tissue can be successfully formed in vivo.
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Affiliation(s)
- Wei Hao
- Institute of Orthopaedics, Xijing Hospital,Fourth Military Medical University, Xi'an, PR China
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Gentleman E, Dee KC, Livesay GA, Nauman EA. Operating curves to characterize the contraction of fibroblast-seeded collagen gel/collagen fiber composite biomaterials: effect of fiber mass. Plast Reconstr Surg 2007; 119:508-16. [PMID: 17230083 DOI: 10.1097/01.prs.0000246316.87802.b4] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
BACKGROUND Collagen is a well-established and important biomaterial that could be used to help meet significant medical needs for various soft-tissue replacements. Many efforts to create engineered soft-tissue constructs by seeding cells within collagen gels have been hampered because constituent cells contract collagen gels over time, resulting in a construct that is only a fraction of the original size and that contains a cell population that has suffered a large degree of cell death. However, the presence of embedded short collagen fibers has been shown to significantly limit contraction and dramatically enhance permeability in fibroblast-seeded collagen gels. METHODS Five volume fractions of short collagen fibers were embedded in fibroblast-seeded collagen gels. Collagen gel contraction (n > or = 4 for all groups) and cell viability (n > or = 3 for all groups) were examined after up to 2 weeks in culture. RESULTS The present study demonstrated that increasing the volume fraction of short collagen fibers in fibroblast-seeded collagen gels correspondingly reduced the amount of gel contraction without negatively impacting cell viability after 2 weeks of culture. Furthermore, operating curves that describe the quantitative relationships between the contraction of fibroblast-seeded collagen gel/collagen fiber composite biomaterials, time in culture, and volume fraction of embedded fibers were obtained. CONCLUSION The resulting operating curves enable investigators to tailor initial fabrication procedures to ultimately yield cell-seeded collagen composites of specifically desired sizes-a critical step toward developing clinically useful engineered soft-tissue constructs.
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