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Langer S, Radtke C, Györi E, Springer A, Metzelder ML. Bladder augmentation in children: current problems and experimental strategies for reconstruction. Wien Med Wochenschr 2018; 169:61-70. [PMID: 30084093 PMCID: PMC6394595 DOI: 10.1007/s10354-018-0645-z] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2018] [Accepted: 06/21/2018] [Indexed: 12/31/2022]
Abstract
Bladder augmentation is a demanding surgical procedure and exclusively offered for selected children and has only a small spectrum of indications. Paediatric bladder voiding dysfunction occurs either on a basis of neurological dysfunction caused by congenital neural tube defects or on a basis of rare congenital anatomic malformations. Neurogenic bladder dysfunction often responds well to a combination of specific drugs and/or intermittent self-catheterization. However, selected patients with spinal dysraphism and children with congenital malformations like bladder exstrophy and resulting small bladder capacity might require bladder augmentation. Ileocystoplasty is the preferred method of bladder augmentation to date. Because of the substantial long-and short-term morbidity of augmentation cystoplasty, recent studies have tried to incorporate new techniques and technologies, such as the use of biomaterials to overcome or reduce the adverse effects. In this regard, homografts and allografts have been implemented in bladder augmentation with varying results, but recent studies have shown promising data in terms of proliferation of urothelium and muscle cells by using biological silk grafts.
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Affiliation(s)
- Sophie Langer
- General Hospital Vienna, Clinical Department of Paediatric Surgery, Medical University of Vienna, Waehringer Guertel 18-20, 1090, Vienna, Austria
| | - Christine Radtke
- General Hospital Vienna, Clinical Department of Plastic and Reconstructive Surgery, Medical University of Vienna, Waehringer Guertel 18-20, 1090, Vienna, Austria
| | - Eva Györi
- General Hospital Vienna, Clinical Department of Plastic and Reconstructive Surgery, Medical University of Vienna, Waehringer Guertel 18-20, 1090, Vienna, Austria
| | - Alexander Springer
- General Hospital Vienna, Clinical Department of Paediatric Surgery, Medical University of Vienna, Waehringer Guertel 18-20, 1090, Vienna, Austria
| | - Martin L Metzelder
- General Hospital Vienna, Clinical Department of Paediatric Surgery, Medical University of Vienna, Waehringer Guertel 18-20, 1090, Vienna, Austria.
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Schiavi J, Reppel L, Charif N, de Isla N, Mainard D, Benkirane-Jessel N, Stoltz JF, Rahouadj R, Huselstein C. Mechanical stimulations on human bone marrow mesenchymal stem cells enhance cells differentiation in a three-dimensional layered scaffold. J Tissue Eng Regen Med 2017; 12:360-369. [PMID: 28486755 DOI: 10.1002/term.2461] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2016] [Revised: 03/20/2017] [Accepted: 05/04/2017] [Indexed: 11/05/2022]
Abstract
Scaffolds laden with stem cells are a promising approach for articular cartilage repair. Investigations have shown that implantation of artificial matrices, growth factors or chondrocytes can stimulate cartilage formation, but no existing strategies apply mechanical stimulation on stratified scaffolds to mimic the cartilage environment. The purpose of this study was to adapt a spraying method for stratified cartilage engineering and to stimulate the biosubstitute. Human mesenchymal stem cells from bone marrow were seeded in an alginate (Alg)/hyaluronic acid (HA) or Alg/hydroxyapatite (Hap) gel to direct cartilage and hypertrophic cartilage/subchondral bone differentiation, respectively, in different layers within a single scaffold. Homogeneous or composite stratified scaffolds were cultured for 28 days and cell viability and differentiation were assessed. The heterogeneous scaffold was stimulated daily. The mechanical behaviour of the stratified scaffolds were investigated by plane-strain compression tests. Results showed that the spraying process did not affect cell viability. Moreover, cell differentiation driven by the microenvironment was increased with loading: in the layer with Alg/HA, a specific extracellular matrix of cartilage, composed of glycosaminoglycans and type II collagen was observed, and in the Alg/Hap layer more collagen X was detected. Hap seemed to drive cells to a hypertrophic chondrocytic phenotype and increased mechanical resistance of the scaffold. In conclusion, mechanical stimulations will allow for the production of a stratified biosubstitute, laden with human mesenchymal stem cells from bone marrow, which is capable in vivo to mimic all depths of chondral defects, thanks to an efficient combination of stem cells, biomaterial compositions and mechanical loading.
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Affiliation(s)
- Jessica Schiavi
- CNRS UMR 7365 - Lorraine University, Ingénierie Moléculaire et Physiopathologie Articulaire (IMoPA), Biopôle, Vandœuvre-lès-Nancy, France.,Fédération de Recherche 3209, Bioingénierie Moléculaire Cellulaire et Thérapeutique, Vandœuvre-lès-Nancy, France
| | - Loïc Reppel
- CNRS UMR 7365 - Lorraine University, Ingénierie Moléculaire et Physiopathologie Articulaire (IMoPA), Biopôle, Vandœuvre-lès-Nancy, France.,Fédération de Recherche 3209, Bioingénierie Moléculaire Cellulaire et Thérapeutique, Vandœuvre-lès-Nancy, France.,CHRU de Nancy, Unité de Thérapie Cellulaire et Tissulaire, Vandœuvre-lès-Nancy, France
| | - Naceur Charif
- CNRS UMR 7365 - Lorraine University, Ingénierie Moléculaire et Physiopathologie Articulaire (IMoPA), Biopôle, Vandœuvre-lès-Nancy, France.,Fédération de Recherche 3209, Bioingénierie Moléculaire Cellulaire et Thérapeutique, Vandœuvre-lès-Nancy, France
| | - Natalia de Isla
- CNRS UMR 7365 - Lorraine University, Ingénierie Moléculaire et Physiopathologie Articulaire (IMoPA), Biopôle, Vandœuvre-lès-Nancy, France.,Fédération de Recherche 3209, Bioingénierie Moléculaire Cellulaire et Thérapeutique, Vandœuvre-lès-Nancy, France
| | - Didier Mainard
- CNRS UMR 7365 - Lorraine University, Ingénierie Moléculaire et Physiopathologie Articulaire (IMoPA), Biopôle, Vandœuvre-lès-Nancy, France.,Fédération de Recherche 3209, Bioingénierie Moléculaire Cellulaire et Thérapeutique, Vandœuvre-lès-Nancy, France.,CHRU de Nancy, Chirurgie Orthopédique et Traumatologique, Nancy, France
| | | | - Jean-François Stoltz
- CNRS UMR 7365 - Lorraine University, Ingénierie Moléculaire et Physiopathologie Articulaire (IMoPA), Biopôle, Vandœuvre-lès-Nancy, France.,Fédération de Recherche 3209, Bioingénierie Moléculaire Cellulaire et Thérapeutique, Vandœuvre-lès-Nancy, France.,CHRU de Nancy, Unité de Thérapie Cellulaire et Tissulaire, Vandœuvre-lès-Nancy, France
| | - Rachid Rahouadj
- CNRS - UMR 7563 - Lorraine University, Vandœuvre-lès-Nancy, France
| | - Céline Huselstein
- CNRS UMR 7365 - Lorraine University, Ingénierie Moléculaire et Physiopathologie Articulaire (IMoPA), Biopôle, Vandœuvre-lès-Nancy, France.,Fédération de Recherche 3209, Bioingénierie Moléculaire Cellulaire et Thérapeutique, Vandœuvre-lès-Nancy, France
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Hidas G, Lee HJ, Bahoric A, Kelly MS, Watts B, Liu Z, Saharti S, Lusch A, Alamsahebpour A, Kerbl D, Truong H, Zi X, Khoury AE. Aerosol transfer of bladder urothelial and smooth muscle cells onto demucosalized colonic segments for bladder augmentation: in vivo, long term, and functional pilot study. J Pediatr Urol 2015; 11:260.e1-6. [PMID: 26022502 PMCID: PMC4623943 DOI: 10.1016/j.jpurol.2015.02.020] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/09/2014] [Accepted: 02/26/2015] [Indexed: 01/24/2023]
Abstract
BACKGROUND Bladder augmentation technique has changed over the years and the current practice has significant adverse health effects and long-term sequelae. Previously, we reported a novel cell transfer technology for covering demucosalized colonic segments with bladder urothelium and smooth muscle cells through an aerosol spraying of these cells and a fibrin glue mixture. OBJECTIVE To determine the long-term durability and functional characteristics of demucosalized segments of colon repopulated with urothelial cells in the bladder of swine for use in augmentation cystoplasty. STUDY DESIGN Nine swine were divided into three groups. The first group (control) underwent standard colocystoplasty; the second group underwent colocystoplasty with colonic demucosalization and aerosol application of fibrin glue and urothelial cell mixture; in the third group detrusor cells were added to the mixture described in group two. The animals were kept for 6 months. Absorptive and secretory function was assessed. Bladders were harvested for histological and immunohistochemical evaluation. RESULTS All animals but one in the experimental groups showed confluent urothelial coverage of the colonic segment in the bladder without any evidence of fibrosis, inflammation, or regrowth of colonic epithelial cells. Ten percent of the instilled water in the bladder was absorbed within an hour in the control group, but none in experimental groups(p = 0.02). The total urine sediment and protein contents were higher in the control group compared with experimental groups (p < 0.05). DISCUSSION Both study groups developed a uniform urothelial lining. Histologically, the group with smooth muscle had an added layer of submucosal smooth muscle. Six months after bladder augmentation the new lining was durable. We were also able to demonstrate that the reconstituted augmented segments secrete and absorb significantly less than the control colocystoplasty group. We used a non-validated simple method to evaluate permeability of the new urothelial lining to water. To determine if the aerosol transfer of bladder cells would have behaved differently in the neurogenic bladder population, this experiment should have been performed in animals with neuropathic bladders. CONCLUSION Aerosol spraying of single cell suspension of urothelial and muscular cells with fibrin glue resulted in coverage of the demucosalized intestinal segment with a uniform urothelial layer. This new lining segment was durable without regrowth of colonic mucosa after 6 months. The new reconstituted segment absorbs and secretes significantly less than control colocystoplasty.
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Affiliation(s)
- Guy Hidas
- Urology Department, University of California, Irvine, Orange, CA, USA
| | - Hak J Lee
- Urology Department, University of California, Irvine, Orange, CA, USA
| | | | - Maryellen S Kelly
- Urology Department, University of California, Irvine, Orange, CA, USA
| | - Blake Watts
- Urology Department, University of California, Irvine, Orange, CA, USA
| | - Zhongbo Liu
- Urology Department, University of California, Irvine, Orange, CA, USA
| | - Samah Saharti
- Pathology Department, University of California, Irvine, Orange, CA, USA
| | - Achim Lusch
- Urology Department, University of California, Irvine, Orange, CA, USA
| | | | - David Kerbl
- Urology Department, University of California, Irvine, Orange, CA, USA
| | - Hung Truong
- Urology Department, University of California, Irvine, Orange, CA, USA
| | - Xiaolin Zi
- Urology Department, University of California, Irvine, Orange, CA, USA
| | - Antoine E Khoury
- Urology Department, University of California, Irvine, Orange, CA, USA.
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Panayotov IV, Collart-Dutilleul PY, Salehi H, Martin M, Végh A, Yachouh J, Vladimirov B, Sipos P, Szalontai B, Gergely C, Cuisinier FJG. Sprayed cells and polyelectrolyte films for biomaterial functionalization: the influence of physical PLL-PGA film treatments on dental pulp cell behavior. Macromol Biosci 2014; 14:1771-82. [PMID: 25212873 DOI: 10.1002/mabi.201400256] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2014] [Revised: 08/07/2014] [Indexed: 02/05/2023]
Abstract
Further development of biomaterials is expected as advanced therapeutic products must be compliant to good manufacturing practice regulations. A spraying method for building-up polyelectrolyte films followed by the deposition of dental pulp cells by spraying is presented. Physical treatments of UV irradiation and a drying/wetting process are applied to the system. Structural changes and elasticity modifications of the obtained coatings are revealed by atomic force microscopy and by Raman spectroscopy. This procedure results in thicker, rougher and stiffer film. The initially ordered structure composed of mainly α helices is transformed into random/β-structures. The treatment enhanced dental pulp cell adhesion and proliferation, suggesting that this system is promising for medical applications.
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Affiliation(s)
- Ivan V Panayotov
- EA4203 Laboratoire de Bio-santé et Nano-science, Université Montpellier 1, Montpellier, France.
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Seromuscular grafts for bladder reconstruction: extra-luminal demucosalisation of the bowel. Urology 2013; 80:1147-50. [PMID: 23107403 PMCID: PMC3494834 DOI: 10.1016/j.urology.2012.07.047] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2012] [Revised: 07/30/2012] [Accepted: 07/30/2012] [Indexed: 12/01/2022]
Abstract
Objective To develop a robust sterile, fully demucosalized and vascularized seromuscular patch for use as an adjunct to novel bioengineering techniques aimed at augmenting, reconstructing, or replacing the bladder because of endstage disease. To eliminate deep colonic epithelial crypts to prevent the possibility of colonocyte regrowth. To maintain sterility by excluding the possibility of contamination from the bowel contents. Methods Pilot studies were performed on euthanized pigs to optimize the technique, with tissue samples examined by immunohistochemistry. In vivo, vascularized seromuscular colonic flaps were created from the bowel exterior in 7 large white hybrid pigs. The dissection was facilitated by placing an inflated Foley catheter within the colonic lumen. The seromuscular ends were approximated with 5/0 Vicryl sutures and excess mucosa intussuscepted within the lumen. Demucosalized flaps were used to augment the bladder by composite cystoplasty and were examined immunohistochemically at 3 months. Results Pilot studies showed that the technique was successful in creating seromuscular segments with no epithelial remnants. When applied surgically, the seromuscular flaps survived and showed no evidence of colonocyte regrowth at 3 months. Conclusion Extraluminal dissection creates robust seromuscular flaps and prevents both regrowth by colonic epithelial cells and contamination of the tissue by exposure to the bowel contents. This technique should find application in a range of bladder reconstruction techniques, including composite cystoplasty and autoaugmentation.
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Aboushwareb T, McKenzie P, Wezel F, Southgate J, Badlani G. Is tissue engineering and biomaterials the future for lower urinary tract dysfunction (LUTD)/pelvic organ prolapse (POP)? Neurourol Urodyn 2011; 30:775-82. [PMID: 21661029 DOI: 10.1002/nau.21101] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The fields of tissue engineering and regenerative medicine have seen major advances over the span of the past two decades, with biomaterials playing a central role. Although the term "regenerative medicine" has been applied to encompass most fields of medicine, in fact urology has been one of the most progressive. Many urological applications have been investigated over the past decades, with the culmination of these technologies in the introduction of the first laboratory-produced organ to be placed in a human body.1 With the quality of life issues associated with urinary incontinence, there is a strong driver to identify and introduce new technologies and the potential exists for further major advancements from regenerative medicine approaches using biomaterials, cells or a combination of both. A central question is why use biomaterials? The answer rests on the need to make up for inadequate or lack of autologous tissue, to decrease morbidity and to improve long-term efficacy. Thus, the ideal biomaterial needs to meet the following criteria: (1) Provide mechanical and structural support, (2) Maintain compliance and be biocompatible with surrounding tissues, and (3) Be "fit for purpose" by meeting specific application needs ranging from static support to bioactive cell signaling. In essence, this represents a wide range of biomaterials with a spectrum of potential applications, from use as a supportive or bulking implant alone, to implanted biomaterials that promote integration and eventual replacement by infiltrating host cells, or scaffolds pre-seeded with cells prior to implant. In this review we shall discuss the structural versus the integrative uses of biomaterials by referring to two key areas in urology of (1) pelvic organ support for prolapse and stress urinary incontinence, and (2) bladder replacement/augmentation.
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Abstract
The term 'regenerative medicine' encompasses strategies for restoring or renewing tissue or organ function by: (i) in vivo tissue repair by in-growth of host cells into an acellular natural or synthetic biomaterial, (ii) implantation of tissue 'engineered'in vitro by seeding cultured cells into a biomaterial scaffold, and (iii) therapeutic cloning and stem cell-based tissue regeneration. In this article, we review recent developments underpinning the emerging science of regenerative medicine and critically assess where successful implementation of novel regenerative medicine approaches into urology practice might genuinely transform the quality of life of affected individuals. We advocate the need for an evidence-based approach supported by strong science and clinical objectivity.
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Affiliation(s)
- Felix Wezel
- Jack Birch Unit for Molecular Carcinogenesis, Department of Biology, University of York, York, UK
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Turner A, Subramanian R, Thomas DFM, Hinley J, Abbas SK, Stahlschmidt J, Southgate J. Transplantation of autologous differentiated urothelium in an experimental model of composite cystoplasty. Eur Urol 2010; 59:447-54. [PMID: 21195539 PMCID: PMC3098455 DOI: 10.1016/j.eururo.2010.12.004] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2010] [Accepted: 12/10/2010] [Indexed: 12/17/2022]
Abstract
BACKGROUND Enterocystoplasty is associated with serious complications resulting from the chronic interaction between intestinal epithelium and urine. Composite cystoplasty is proposed as a means of overcoming these complications by substituting intestinal epithelium with tissue-engineered autologous urothelium. OBJECTIVE To develop a robust surgical procedure for composite cystoplasty and to determine if outcome is improved by transplantation of a differentiated urothelium. DESIGN, SETTING, AND PARTICIPANTS Bladder augmentation with in vitro-generated autologous tissues was performed in 11 female Large-White hybrid pigs in a well-equipped biomedical centre with operating facilities. Participants were a team comprising scientists, urologists, a veterinary surgeon, and a histopathologist. MEASUREMENTS Urothelium harvested by open biopsy was expanded in culture and used to develop sheets of nondifferentiated or differentiated urothelium. The sheets were transplanted onto a vascularised, de-epithelialised, seromuscular colonic segment at the time of bladder augmentation. After removal of catheters and balloon at two weeks, voiding behaviour was monitored and animals were sacrificed at 3 months for immunohistology. RESULTS AND LIMITATIONS Eleven pigs underwent augmentation, but four were lost to complications. Voiding behaviour was normal in the remainder. At autopsy, reconstructed bladders were healthy, lined by confluent urothelium, and showed no fibrosis, mucus, calculi, or colonic regrowth. Urothelial morphology was transitional with variable columnar attributes consistent between native and augmented segments. Bladders reconstructed with differentiated cell sheets had fewer lymphocytes infiltrating the lamina propria, indicating more effective urinary barrier function. CONCLUSIONS The study endorses the potential for composite cystoplasty by (1) successfully developing reliable techniques for transplanting urothelium onto a prepared, vascularised, smooth muscle segment and (2) creating a functional urothelium-lined augmentation to overcome the complications of conventional enterocystoplasty.
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Affiliation(s)
- Alex Turner
- Jack Birch Unit for Molecular Carcinogenesis, Department of Biology, University of York, York, UK
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Ibrahim ME, Ezzat MM, Ezzat WM. The use of seromuscular tapered ileal tube in ureteral replacement: an experimental model. Int Urol Nephrol 2009; 42:697-701. [PMID: 20013053 DOI: 10.1007/s11255-009-9672-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2009] [Accepted: 10/23/2009] [Indexed: 11/25/2022]
Abstract
PURPOSE To assess the capability of urothelium to proliferate, creep and line the inner surface of the interposed seromuscular tapered ileal tube. MATERIALS AND METHODS Under general anesthesia, 15 female dogs underwent resection of 5 cm of the mid ureter and replaced with tapered seromuscular ileal tube stented for 6 weeks. The animals were sacrificed, and cross section of the ileal ureters were examined histologically for the lining cells. RESULTS Multilayer of transitional epithelium was seen covering all the inner surface of the interposed seromuscular tube at the end of 6 weeks. Excessive inflammatory cell infiltration was a prominent finding in the submucosal layer. CONCLUSION Transitional epithelium has the capability to proliferate, grow and cover the inner surface of the interposed seromuscular ileal tube. Urothelium lining avoid the metabolic complications of the intestinal mucosa.
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Nahmias Y, Arneja A, Tower TT, Renn MJ, Odde DJ. Cell patterning on biological gels via cell spraying through a mask. ACTA ACUST UNITED AC 2006; 11:701-8. [PMID: 15998211 DOI: 10.1089/ten.2005.11.701] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
We present an easily applicable and inexpensive method for patterning cells on arbitrary surfaces including biological gels with little loss of viability or function. Single-cell suspensions of human umbilical vein endothelial cells and NIH 3T3 fibroblasts were sprayed with an off-the-shelf airbrush through a mask to create 100-microm scale patterns on collagen gels. Three-dimensional patterns were created by layering a collagen gel on top of the first pattern and patterning the top gel. Coculture of rat hepatocytes with NIH 3T3 patterns on collagen gels resulted in localized increased activity of cytochrome P-450 along the pattern. These results suggest that cell spraying is a useful tool for the study of heterotypic cellular interactions and tissue-engineering applications on biologically relevant matrices, and for the creation of three-dimensional cell patterns in vitro.
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Affiliation(s)
- Yaakov Nahmias
- Department of Biomedical Engineering, University of Minnesota, Minneapolis, Minnesota 55455, USA
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Abstract
Skin replacement has been a challenging task for surgeons ever since the introduction of skin grafts by Reverdin in 1871. Recently, skin grafting has evolved from the initial autograft and allograft preparations to biosynthetic and tissue-engineered living skin replacements. This has been fostered by the dramatically improved survival rates of major burns where the availability of autologous normal skin for grafting has become one of the limiting factors. The ideal properties of a temporary and a permanent skin substitute have been well defined. Tissue-engineered skin replacements: cultured autologous keratinocyte grafts, cultured allogeneic keratinocyte grafts, autologous/allogeneic composites, acellular biological matrices, and cellular matrices including such biological substances as fibrin sealant and various types of collagen, hyaluronic acid etc. have opened new horizons to deal with such massive skin loss. In extensive burns it has been shown that skin substitution with cultured grafts can be a life-saving measure where few alternatives exist. Future research will aim to create skin substitutes with cultured epidermis that under appropriate circumstances may provide a wound cover that could be just as durable and esthetically acceptable as conventional split-thickness skin grafts. Genetic manipulation may in addition enhance the performance of such cultured skin substitutes. If cell science, molecular biology, genetic engineering, material science and clinical expertise join their efforts to develop optimized cell culture techniques and synthetic or biological matrices then further technical advances might well lead to the production of almost skin like new tissue-engineered human skin products resembling natural human skin.
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Affiliation(s)
- Raymund E Horch
- Department of Plastic and Hand Surgery, University of Erlangen-Nürnberg, Erlangen, D-91054, Germany.
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Schultheiss D, Gabouev AI, Kaufmann PM, Schlote N, Mertsching H, Haverich A, Stief CG, Jonas U. Biologische vaskularisierte Matrix (BioVaM). Urologe A 2004; 43:1223-8. [PMID: 15549160 DOI: 10.1007/s00120-004-0702-7] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
A new technique is presented to harvest an acellular matrix from a porcine small bowel segment preserving the mesenteric arterial and venous pedicles. Reseeding of this biological vascularized matrix (BioVaM) with functional cells, i.e. smooth muscle and urothelial cells isolated from the urinary tract, and resurfacing of its vascular structures with endothelial precursor cells results in a vascularized tissue engineered graft for reconstruction and augmentation of the urinary bladder. First promising short term implantation experiments using a porcine model for the evaluation of early graft perfusion after vascular anastomosis are presented.
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Affiliation(s)
- D Schultheiss
- Klinik und Poliklinik für Urologie und Kinderurologie, Medizinische Hochschule Hannover.
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