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Booth D, Afshari R, Ghovvati M, Shariati K, Sturm R, Annabi N. Advances in 3D bioprinting for urethral tissue reconstruction. Trends Biotechnol 2024; 42:544-559. [PMID: 38057169 DOI: 10.1016/j.tibtech.2023.10.009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2023] [Revised: 10/20/2023] [Accepted: 10/24/2023] [Indexed: 12/08/2023]
Abstract
Urethral conditions affect children and adults, increasing the risk of urinary tract infections, voiding and sexual dysfunction, and renal failure. Current tissue replacements differ from healthy urethral tissues in structural and mechanical characteristics, causing high risk of postoperative complications. 3D bioprinting can overcome these limitations through the creation of complex, layered architectures using materials with location-specific biomechanical properties. This review highlights prior research and describes the potential for these emerging technologies to address ongoing challenges in urethral tissue engineering, including biomechanical and structural mismatch, lack of individualized repair solutions, and inadequate wound healing and vascularization. In the future, the integration of 3D bioprinting technology with advanced biomaterials, computational modeling, and 3D imaging could transform personalized urethral surgical procedures.
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Affiliation(s)
- Daniel Booth
- Department of Chemical and Biomolecular Engineering, University of California, Los Angeles, Los Angeles, CA 90095, USA
| | - Ronak Afshari
- Department of Chemical and Biomolecular Engineering, University of California, Los Angeles, Los Angeles, CA 90095, USA
| | - Mahsa Ghovvati
- Department of Chemical and Biomolecular Engineering, University of California, Los Angeles, Los Angeles, CA 90095, USA
| | - Kaavian Shariati
- David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, CA 90095, USA
| | - Renea Sturm
- David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, CA 90095, USA; Department of Urology, David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, CA 90095, USA.
| | - Nasim Annabi
- Department of Chemical and Biomolecular Engineering, University of California, Los Angeles, Los Angeles, CA 90095, USA; Department of Bioengineering, University of California, Los Angeles, Los Angeles, CA 90095, USA.
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Cheng Q, Zhang L, Zhang J, Zhou X, Wu B, Wang D, Wei T, Shafiq M, Li S, Zhi D, Guan Y, Wang K, Kong D. Decellularized Scaffolds with Double-Layer Aligned Microchannels Induce the Oriented Growth of Bladder Smooth Muscle Cells: Toward Urethral and Ureteral Reconstruction. Adv Healthc Mater 2023; 12:e2300544. [PMID: 37638600 DOI: 10.1002/adhm.202300544] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2023] [Revised: 06/27/2023] [Indexed: 08/29/2023]
Abstract
There is a great clinical need for regenerating urinary tissue. Native urethras and ureters have bidirectional aligned smooth muscle cells (SMCs) layers, which plays a pivotal role in micturition and transporting urine and inhibiting reflux. Thus far, urinary scaffolds have not been designed to induce the native-mimicking aligned arrangement of SMCs. In this study, a tubular decellularized extracellular matrix (dECM) with an intact internal layer and bidirectional aligned microchannels in the tubular wall, which is realized by the subcutaneous implantation of a template, followed by the removal of the template, and decellularization, is engineered. The dense and intact internal layer effectively increases the leakage pressure of the tubular dECM scaffolds. Rat-derived dECM scaffolds with three different sizes of microchannels are fabricated by tailoring the fiber diameter of the templates. The rat-derived dECM scaffolds exhibiting microchannels of ≈65 µm show suitable mechanical properties, good ability to induce the bidirectional alignment and growth of human bladder SMCs, and elevated higher functional protein expression in vitro. These data indicate that rat-derived tubular dECM scaffolds manifesting double-layer aligned microchannels may be promising candidates to induce the native-mimicking regeneration of SMCs in urethra and ureter reconstruction.
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Affiliation(s)
- Quhan Cheng
- Key Laboratory of Bioactive Materials, Ministry of Education, College of Life Sciences, Nankai University, Tianjin, 300071, China
| | - Linli Zhang
- Key Laboratory of Bioactive Materials, Ministry of Education, College of Life Sciences, Nankai University, Tianjin, 300071, China
| | - Jingai Zhang
- Key Laboratory of Bioactive Materials, Ministry of Education, College of Life Sciences, Nankai University, Tianjin, 300071, China
| | - Xin Zhou
- Department of Medical Imaging, Shanxi Medical University, Taiyuan, 030001, China
| | - Boyu Wu
- Key Laboratory of Bioactive Materials, Ministry of Education, College of Life Sciences, Nankai University, Tianjin, 300071, China
| | - Dezheng Wang
- Key Laboratory of Bioactive Materials, Ministry of Education, College of Life Sciences, Nankai University, Tianjin, 300071, China
| | - Tingting Wei
- Key Laboratory of Bioactive Materials, Ministry of Education, College of Life Sciences, Nankai University, Tianjin, 300071, China
| | - Muhammad Shafiq
- Department of Chemical Engineering, Faculty of Engineering, Graduate School, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka, 819-0395, Japan
| | - Shengbin Li
- Department of Urology, Tianjin Children's Hospital/Tianjin University Children's Hospital, Tianjin, 300134, China
| | - Dengke Zhi
- Key Laboratory of Bioactive Materials, Ministry of Education, College of Life Sciences, Nankai University, Tianjin, 300071, China
| | - Yong Guan
- Department of Urology, Tianjin Children's Hospital/Tianjin University Children's Hospital, Tianjin, 300134, China
| | - Kai Wang
- Key Laboratory of Bioactive Materials, Ministry of Education, College of Life Sciences, Nankai University, Tianjin, 300071, China
| | - Deling Kong
- Key Laboratory of Bioactive Materials, Ministry of Education, College of Life Sciences, Nankai University, Tianjin, 300071, China
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The application of 3D bioprinting in urological diseases. Mater Today Bio 2022; 16:100388. [PMID: 35967737 PMCID: PMC9364106 DOI: 10.1016/j.mtbio.2022.100388] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2022] [Revised: 07/24/2022] [Accepted: 07/27/2022] [Indexed: 12/02/2022] Open
Abstract
Urologic diseases are commonly diagnosed health problems affecting people around the world. More than 26 million people suffer from urologic diseases and the annual expenditure was more than 11 billion US dollars. The urologic cancers, like bladder cancer, prostate cancer and kidney cancer are always the leading causes of death worldwide, which account for approximately 22% and 10% of the new cancer cases and death, respectively. Organ transplantation is one of the major clinical treatments for urological diseases like end-stage renal disease and urethral stricture, albeit strongly limited by the availability of matching donor organs. Tissue engineering has been recognized as a highly promising strategy to solve the problems of organ donor shortage by the fabrication of artificial organs/tissue. This includes the prospective technology of three-dimensional (3D) bioprinting, which has been adapted to various cell types and biomaterials to replicate the heterogeneity of urological organs for the investigation of organ transplantation and disease progression. This review discusses various types of 3D bioprinting methodologies and commonly used biomaterials for urological diseases. The literature shows that advances in this field toward the development of functional urological organs or disease models have progressively increased. Although numerous challenges still need to be tackled, like the technical difficulties of replicating the heterogeneity of urologic organs and the limited biomaterial choices to recapitulate the complicated extracellular matrix components, it has been proved by numerous studies that 3D bioprinting has the potential to fabricate functional urological organs for clinical transplantation and in vitro disease models. Outline the advantages and characteristics of 3D printing compared with traditional methods for urological diseases. Guide the selection of 3D bioprinting technology and material in urological tissue engineering. Discuss the challenges and future perspectives of 3D bioprinting in urological diseases and clinical translation.
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Zhu Z, Yang J, Ji X, Wang Z, Dai C, Li S, Li X, Xie Y, Zheng Y, Lin J, Zhou L. Clinical application of a double-modified sulfated bacterial cellulose scaffold material loaded with FGFR2-modified adipose-derived stem cells in urethral reconstruction. Stem Cell Res Ther 2022; 13:463. [PMID: 36068613 PMCID: PMC9450280 DOI: 10.1186/s13287-022-03164-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2022] [Accepted: 08/18/2022] [Indexed: 11/24/2022] Open
Abstract
BACKGROUND Urethral stricture and reconstruction are one of the thorny difficult problems in the field of urology. The continuous development of tissue engineering and biomaterials has given new therapeutic thinking to this problem. Bacterial cellulose (BC) is an excellent biomaterial due to its accessibility and strong plasticity. Moreover, adipose-derived stem cells (ADSCs) could enhance their wound healing ability through directional modification. METHODS First, we used physical drilling and sulfonation in this study to make BC more conducive to cell attachment and degradation. We tested the relevant mechanical properties of these materials. After that, we attached Fibroblast Growth Factor Receptor 2 (FGFR2)-modified ADSCs to the material to construct a urethra for tissue engineering. Afterward, we verified this finding in the male New Zealand rabbit model and carried out immunohistochemical and imaging examinations 1 and 3 months after the operation. At the same time, we detected the potential biological function of FGFR2 by bioinformatics and a cytokine chip. RESULTS The results show that the composite has excellent repairability and that this ability is correlated with angiogenesis. The new composite in this study provides new insight and therapeutic methods for urethral reconstruction. The preliminary mechanism showed that FGFR2 could promote angiogenesis and tissue repair by promoting the secretion of Vascular Endothelial Growth Factor A (VEGFA) from ADSCs. CONCLUSIONS Double-modified sulfonated bacterial cellulose scaffolds combined with FGFR2-modified ADSCs provide new sight and treatments for patients with urethral strictures.
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Affiliation(s)
- Zhenpeng Zhu
- Department of Urology, Peking University First Hospital, Beijing, 100034, China
- Institution of Urology, Peking University, Beijing, 100034, China
- Beijing Key Laboratory of Urogenital Diseases (Male) Molecular Diagnosis and Treatment Center, Beijing, 100034, China
| | - Jiayu Yang
- University of Science and Technology, Beijing, Beijing, 100083, China
| | - Xing Ji
- Department of Urology, Peking University First Hospital, Beijing, 100034, China
- Institution of Urology, Peking University, Beijing, 100034, China
- Beijing Key Laboratory of Urogenital Diseases (Male) Molecular Diagnosis and Treatment Center, Beijing, 100034, China
| | - Zicheng Wang
- Department of Urology, The First Affiliated Hospital of Anhui Medical University, Hefei, 230000, China
| | - Chengxiang Dai
- University of Science and Technology, Beijing, Beijing, 100083, China
- Cellular Biomedicine Group Inc. (CBMG), Shanghai, 200234, China
| | - Suke Li
- Cellular Biomedicine Group Inc. (CBMG), Shanghai, 200234, China
| | - Xuesong Li
- Department of Urology, Peking University First Hospital, Beijing, 100034, China
- Institution of Urology, Peking University, Beijing, 100034, China
- Beijing Key Laboratory of Urogenital Diseases (Male) Molecular Diagnosis and Treatment Center, Beijing, 100034, China
| | - Yajie Xie
- University of Science and Technology, Beijing, Beijing, 100083, China
| | - Yudong Zheng
- University of Science and Technology, Beijing, Beijing, 100083, China.
| | - Jian Lin
- Department of Urology, Peking University First Hospital, Beijing, 100034, China.
- Institution of Urology, Peking University, Beijing, 100034, China.
- Beijing Key Laboratory of Urogenital Diseases (Male) Molecular Diagnosis and Treatment Center, Beijing, 100034, China.
| | - Liqun Zhou
- Department of Urology, Peking University First Hospital, Beijing, 100034, China.
- Institution of Urology, Peking University, Beijing, 100034, China.
- Beijing Key Laboratory of Urogenital Diseases (Male) Molecular Diagnosis and Treatment Center, Beijing, 100034, China.
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Kurowiak J, Mackiewicz A, Klekiel T, Będziński R. Evaluation of Selected Properties of Sodium Alginate-Based Hydrogel Material—Mechanical Strength, μDIC Analysis and Degradation. MATERIALS 2022; 15:ma15031225. [PMID: 35161169 PMCID: PMC8839524 DOI: 10.3390/ma15031225] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/20/2021] [Revised: 02/03/2022] [Accepted: 02/04/2022] [Indexed: 11/25/2022]
Abstract
The search for ideal solutions for the treatment of urethral stenosis continues. This includes developing the material, design, while maintaining its optimal and desired properties. This paper presents the results of the research conducted on sodium alginate-based hydrogel material (AHM), which may be used as a material for stents dedicated to the treatment of pathologies occurring in the genitourinary system. In order to determine the selected parameters of the AHM samples, strength and degradation tests, as well as analysis of the micro changes occurring on the surface of the material using a digital image correlation (µDIC) system, were performed. This study shows that the material possessed good mechanical strength parameters, the knowledge of which is particularly important from the point of view of the stent-tissue interaction. The degradation analysis performed showed that the AHM samples degrade in an artificial urine environment, and that the degradation time mainly depends on the chemical composition of the material. The novel µDIC method performed allowed us to characterize the homogeneity of the material structure depending on the cross-linking agent used.
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Gallo N, Natali ML, Curci C, Picerno A, Gallone A, Vulpi M, Vitarelli A, Ditonno P, Cascione M, Sallustio F, Rinaldi R, Sannino A, Salvatore L. Analysis of the Physico-Chemical, Mechanical and Biological Properties of Crosslinked Type-I Collagen from Horse Tendon: Towards the Development of Ideal Scaffolding Material for Urethral Regeneration. MATERIALS (BASEL, SWITZERLAND) 2021; 14:7648. [PMID: 34947245 PMCID: PMC8707771 DOI: 10.3390/ma14247648] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/04/2021] [Revised: 12/05/2021] [Accepted: 12/09/2021] [Indexed: 11/19/2022]
Abstract
Urethral stenosis is a pathological condition that consists in the narrowing of the urethral lumen because of the formation of scar tissue. Unfortunately, none of the current surgical approaches represent an optimal solution because of the high stricture recurrence rate. In this context, we preliminarily explored the potential of an insoluble type-I collagen from horse tendon as scaffolding material for the development of innovative devices for the regeneration of injured urethral tracts. Non-porous collagen-based substrates were produced and optimized, in terms of crosslinking density of the macromolecular structure, to either provide mechanical properties compliant with the urinary tract physiological stress and better sustain tissue regeneration. The effect of the adopted crosslinking strategy on the protein integrity and on the substrate physical-chemical, mechanical and biological properties was investigated in comparison with a decellularized matrix from porcine small intestinal submucosa (SIS patch), an extensively used xenograft licensed for clinical use in urology. The optimized production protocols allowed the preservation of the type I collagen native structure and the realization of a substrate with appealing end-use properties. The biological response, preliminarily investigated by immunofluorescence experiments on human adult renal stem/progenitor cells until 28 days, showed the formation of a stem-cell monolayer within 14 days and the onset of spheroids within 28 days. These results suggested the great potential of the collagen-based material for the development of scaffolds for urethral plate regeneration and for in vitro cellular studies.
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Affiliation(s)
- Nunzia Gallo
- Department of Engineering for Innovation, University of Salento, 73100 Lecce, Italy; (M.L.N.); (A.S.); (L.S.)
| | - Maria Lucia Natali
- Department of Engineering for Innovation, University of Salento, 73100 Lecce, Italy; (M.L.N.); (A.S.); (L.S.)
- Typeone Biomaterials, Via Vittorio Veneto 64/C, 73036 Muro Leccese, Italy
| | - Claudia Curci
- Department of Basic Medical Sciences, Neurosciences and Sense Organs, University of Bari “Aldo Moro”, 70124 Bari, Italy; (C.C.); (A.G.)
| | - Angela Picerno
- Nephrology Unit, Department of Emergency and Organ Transplantation, University of Bari “Aldo Moro”, 70124 Bari, Italy;
| | - Anna Gallone
- Department of Basic Medical Sciences, Neurosciences and Sense Organs, University of Bari “Aldo Moro”, 70124 Bari, Italy; (C.C.); (A.G.)
| | - Marco Vulpi
- Urology and Andrology Unit, Department of Emergency and Organ Transplant, University of Bari “Aldo Moro”, 70124 Bari, Italy; (M.V.); (A.V.); (P.D.)
| | - Antonio Vitarelli
- Urology and Andrology Unit, Department of Emergency and Organ Transplant, University of Bari “Aldo Moro”, 70124 Bari, Italy; (M.V.); (A.V.); (P.D.)
| | - Pasquale Ditonno
- Urology and Andrology Unit, Department of Emergency and Organ Transplant, University of Bari “Aldo Moro”, 70124 Bari, Italy; (M.V.); (A.V.); (P.D.)
| | - Mariafrancesca Cascione
- Department of Mathematics and Physics “Ennio De Giorgi”, University of Salento, 73100 Lecce, Italy; (M.C.); (R.R.)
| | - Fabio Sallustio
- Department of Interdisciplinary Medicine, University of Bari “Aldo Moro”, 70124 Bari, Italy;
| | - Rosaria Rinaldi
- Department of Mathematics and Physics “Ennio De Giorgi”, University of Salento, 73100 Lecce, Italy; (M.C.); (R.R.)
| | - Alessandro Sannino
- Department of Engineering for Innovation, University of Salento, 73100 Lecce, Italy; (M.L.N.); (A.S.); (L.S.)
| | - Luca Salvatore
- Department of Engineering for Innovation, University of Salento, 73100 Lecce, Italy; (M.L.N.); (A.S.); (L.S.)
- Typeone Biomaterials, Via Vittorio Veneto 64/C, 73036 Muro Leccese, Italy
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Corzo Salinas DR, Sordelli A, Martínez LA, Villoldo G, Bernal C, Pérez MS, Cerrutti P, Foresti ML. Production of bacterial cellulose tubes for biomedical applications: Analysis of the effect of fermentation time on selected properties. Int J Biol Macromol 2021; 189:1-10. [PMID: 34364942 DOI: 10.1016/j.ijbiomac.2021.08.011] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2021] [Revised: 08/01/2021] [Accepted: 08/02/2021] [Indexed: 01/11/2023]
Abstract
Biosynthesis of bacterial cellulose (BC) in cylindrical oxygen permeable molds allows the production of hollow tubular structures of increasing interest for biomedical applications (artificial blood vessels, ureters, urethra, trachea, esophagus, etc.). In the current contribution a simple set-up is used to obtain BC tubes of predefined dimensions; and the effects of fermentation time on the water holding capacity, nanofibrils network architecture, specific surface area, chemical purity, thermal stability, mechanical properties, and cell adhesion, proliferation and migration of BC tubes are systematically analysed for the first time. The results reported highlight the role of culture time on key properties of the BC tubes produced, with significant differences arising from the denser and more compact fibril arrangements generated at longer fermentation intervals.
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Affiliation(s)
- D R Corzo Salinas
- Grupo de Biotecnología y Materiales Biobasados, Instituto de Tecnología en Polímeros y Nanotecnología (ITPN-UBA-CONICET), Facultad de Ingeniería, Universidad de Buenos Aires, Las Heras 2214 (CP 1127AAR), Buenos Aires, Argentina; Departamento de Ingeniería Química, Facultad de Ingeniería, Universidad de Buenos Aires, Argentina (UBA), Av. Intendente Güiraldes 2620 (CP 1428BGA), Pabellón de Industrias, Ciudad Universitaria, Buenos Aires, Argentina
| | - A Sordelli
- Instituto de Medicina Traslacional e Ingeniería Biomédica (IMTIB), Hospital Italiano de Buenos Aires (HIBA), CONICET, Instituto Universitario HIBA, Potosí 4240 (CP 1199), Buenos Aires, Argentina
| | - L A Martínez
- Centro IREN, Universidad Tecnológica Nacional, Buenos Aires, Argentina
| | - G Villoldo
- Instituto de Medicina Traslacional e Ingeniería Biomédica (IMTIB), Hospital Italiano de Buenos Aires (HIBA), CONICET, Instituto Universitario HIBA, Potosí 4240 (CP 1199), Buenos Aires, Argentina
| | - C Bernal
- Grupo de Ingeniería en Polímeros y Materiales Compuestos, Instituto de Tecnología en Polímeros y Nanotecnología (ITPN-UBA-CONICET), Facultad de Ingeniería, Universidad de Buenos Aires, Las Heras 2214 (CP 1127AAR), Buenos Aires, Argentina; Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Argentina
| | - M S Pérez
- Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Argentina; Instituto de Ingeniería Biomédica, Universidad de Buenos Aires, Buenos Aires, Argentina; Department of Electrical and Computer Engineering, Florida International University, Miami, FL 33174, USA.
| | - P Cerrutti
- Grupo de Biotecnología y Materiales Biobasados, Instituto de Tecnología en Polímeros y Nanotecnología (ITPN-UBA-CONICET), Facultad de Ingeniería, Universidad de Buenos Aires, Las Heras 2214 (CP 1127AAR), Buenos Aires, Argentina; Departamento de Ingeniería Química, Facultad de Ingeniería, Universidad de Buenos Aires, Argentina (UBA), Av. Intendente Güiraldes 2620 (CP 1428BGA), Pabellón de Industrias, Ciudad Universitaria, Buenos Aires, Argentina
| | - M L Foresti
- Grupo de Biotecnología y Materiales Biobasados, Instituto de Tecnología en Polímeros y Nanotecnología (ITPN-UBA-CONICET), Facultad de Ingeniería, Universidad de Buenos Aires, Las Heras 2214 (CP 1127AAR), Buenos Aires, Argentina; Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Argentina.
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Mechanical, compositional and morphological characterisation of the human male urethra for the development of a biomimetic tissue engineered urethral scaffold. Biomaterials 2021; 269:120651. [PMID: 33476892 DOI: 10.1016/j.biomaterials.2021.120651] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2020] [Revised: 12/31/2020] [Accepted: 12/31/2020] [Indexed: 12/11/2022]
Abstract
This study addresses a crucial gap in the literature by characterising the relationship between urethral tissue mechanics, composition and gross structure. We then utilise these data to develop a biomimetic urethral scaffold with physical properties that more accurately mimic the native tissue than existing gold standard scaffolds; small intestinal submucosa (SIS) and urinary bladder matrix (UBM). Nine human urethra samples were mechanically characterised using pressure-diameter and uniaxial extension testing. The composition and gross structure of the tissue was determined using immunohistological staining. A pressure stiffening response is observed during the application of intraluminal pressure. The elastic and viscous tissue responses to extension are free of regional or directional variance. The elastin and collagen content of the tissue correlates significantly with tissue mechanics. Building on these data, a biomimetic urethral scaffold was fabricated from collagen and elastin in a ratio that mimics the composition of the native tissue. The resultant scaffold is comprised of a dense inner layer and a porous outer layer that structurally mimic the submucosa and corpus spongiosum layers of the native tissue, respectively. The porous outer layer facilitated more uniform cell infiltration relative to SIS and UBM when implanted subcutaneously (p < 0.05). The mechanical properties of the biomimetic scaffold better mimic the native tissue compared to SIS and UBM. The tissue characterisation data presented herein paves the way for the development of biomimetic urethral grafts, and the novel scaffold we develop demonstrates positive findings that warrant further in vivo evaluation.
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Fan S, Chen K, Yuan W, Zhang D, Yang S, Lan P, Song L, Shao H, Zhang Y. Biomaterial-Based Scaffolds as Antibacterial Suture Materials. ACS Biomater Sci Eng 2020; 6:3154-3161. [DOI: 10.1021/acsbiomaterials.0c00104] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Suna Fan
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Shanghai Belt and Road Joint Laboratory of Advanced Fiber and Low-Dimension Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, P. R. China
| | - Kai Chen
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Shanghai Belt and Road Joint Laboratory of Advanced Fiber and Low-Dimension Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, P. R. China
| | - Wei Yuan
- Department of Urology, Shanghai Jiao Tong University Affiliated Sixth People’s Hospital, Shanghai 200233, P. R. China
| | - Dongliang Zhang
- Department of Urology, Shanghai Jiao Tong University Affiliated Sixth People’s Hospital, Shanghai 200233, P. R. China
| | - Siqing Yang
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Shanghai Belt and Road Joint Laboratory of Advanced Fiber and Low-Dimension Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, P. R. China
| | - Ping Lan
- Key Laboratory of Yarn Materials Forming and Composite Processing Technology of Zhejiang Province, Jiaxing College, Jiaxing, 314001, P.R. China
| | - Lujie Song
- Department of Urology, Shanghai Jiao Tong University Affiliated Sixth People’s Hospital, Shanghai 200233, P. R. China
| | - Huili Shao
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Shanghai Belt and Road Joint Laboratory of Advanced Fiber and Low-Dimension Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, P. R. China
| | - Yaopeng Zhang
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Shanghai Belt and Road Joint Laboratory of Advanced Fiber and Low-Dimension Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, P. R. China
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Analysis of the Degradation Process of Alginate-Based Hydrogels in Artificial Urine for Use as a Bioresorbable Material in the Treatment of Urethral Injuries. Processes (Basel) 2020. [DOI: 10.3390/pr8030304] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
Hydrogels from natural polymers such as sodium alginate have great potential in regenerative medicine because of their biocompatibility, biodegradability, mechanical properties, bioresorption ability, and relatively low cost. Sodium alginate, a polysaccharide derived from brown seaweed, is the most widely investigated and used biomaterial in biomedical applications. Alginate dressings are also useful as a delivery platform in order to provide a controlled release of therapeutic substances (e.g., pain-relieving, antibacterial, and anti-inflammatory agents). In our work, we aimed to analyze process of degradation of alginate hydrogels. We also describe an original hybrid crosslinking process by using not one, as usual, but a mixture of two crosslinking agents (calcium chloride and barium chloride). We proved that different crosslinking agents allow producing hydrogels with a spectrum of mechanical properties, similar to the urethra tissue. Hydrogels were formed using a dip-coating technique, and then examined by mechanical testing, FTIR (Fourier-Transform Infrared Spectroscopy), and resorption on artificial urine. Obtained hydrogels have a different degradation rate in artificial urine, and they can be used as a material for healing of urethra injuries, especially urethra strictures, which significantly affect the quality of life of patients.
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11
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The current state of tissue engineering in the management of hypospadias. Nat Rev Urol 2020; 17:162-175. [DOI: 10.1038/s41585-020-0281-4] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/06/2020] [Indexed: 12/20/2022]
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12
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Wang B, Lv X, Li Z, Zhang M, Yao J, Sheng N, Lu M, Wang H, Chen S. Urethra-inspired biomimetic scaffold: A therapeutic strategy to promote angiogenesis for urethral regeneration in a rabbit model. Acta Biomater 2020; 102:247-258. [PMID: 31734410 DOI: 10.1016/j.actbio.2019.11.026] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2019] [Revised: 11/11/2019] [Accepted: 11/12/2019] [Indexed: 12/21/2022]
Abstract
Limited angiogenesis and epithelialization make urethral regeneration using conventional tissue-engineered grafts a great challenge. Consequently, inspired from the native urethra, bacterial cellulose (BC) and bladder acellular matrix (BAM) were combined to design a three dimensional (3D) biomimetic scaffold. The developed BC/BAM scaffold was engineered for accelerating urethral regeneration by enhancing angiogenesis and epithelialization. The BC/BAM scaffold reveals the closest mimic of native urethra in terms of the 3D porous nanofibrous structure and component including collagen, glycosaminoglycans, and intrinsic vascular endothelial growth factor (VEGF). In vitro studies showed that the bioinspired BC/BAM scaffold promoted in vitro angiogenesis by facilitating human umbilical vein endothelial cells (HUVECs) growth, expression of endothelial function related proteins and capillary-like tube formation. Effect of the BC/BAM scaffold on angiogenesis and epithelialization was studied by its implantation in a rabbit urethral defect model for 1 and 3 months. Results demonstrated that the improved blood vessels formation in the urethra-inspired BC/BAM scaffold significantly promoted epithelialization and accelerated urethral regeneration. The urethra-inspired BC/BAM scaffold provides us a new design approach to construct grafts for urethral regeneration. STATEMENT OF SIGNIFICANCE: Findings in urethral regeneration demonstrate that an ideal tissue-engineered urethra should have adequate angiogenesis to support epithelialization for urethral regeneration in vivo. In this study, inspired from the native urethra, a bioinspired bacterial cellulose/bladder acellular matrix (BC/BAM) scaffold was developed to promote angiogenesis and epithelialization. The designed scaffold showed the closest physical structure and component to natural urethra, which is beneficial to angiogenesis and regeneration of urethral epithelium. This is the first time to utilize BC and dissolved BAM to develop biomimetic scaffold in urethral tissue engineering. Our biomimetic strategy on urethra graft design provided enhanced angiogenesis and epithelialization to achieve an accelerated and successful rabbit urethral repair. We believe that our urethra-inspired biomimetic scaffold would provide new insights into the design of urethral tissue engineering grafts.
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13
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Abbas TO, Yalcin HC, Pennisi CP. From Acellular Matrices to Smart Polymers: Degradable Scaffolds that are Transforming the Shape of Urethral Tissue Engineering. Int J Mol Sci 2019; 20:E1763. [PMID: 30974769 PMCID: PMC6479944 DOI: 10.3390/ijms20071763] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2019] [Revised: 03/29/2019] [Accepted: 04/02/2019] [Indexed: 12/24/2022] Open
Abstract
Several congenital and acquired conditions may result in severe narrowing of the urethra in men, which represent an ongoing surgical challenge and a significant burden on both health and quality of life. In the field of urethral reconstruction, tissue engineering has emerged as a promising alternative to overcome some of the limitations associated with autologous tissue grafts. In this direction, preclinical as well as clinical studies, have shown that degradable scaffolds are able to restore the normal urethral architecture, supporting neo-vascularization and stratification of the tissue. While a wide variety of degradable biomaterials are under scrutiny, such as decellularized matrices, natural, and synthetic polymers, the search for scaffold materials that could fulfill the clinical performance requirements continues. In this article, we discuss the design requirements of the scaffold that appear to be crucial to better resemble the structural, physical, and biological properties of the native urethra and are expected to support an adequate recovery of the urethral function. In this context, we review the biological performance of the degradable polymers currently applied for urethral reconstruction and outline the perspectives on novel functional polymers, which could find application in the design of customized urethral constructs.
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Affiliation(s)
- Tariq O Abbas
- Laboratory for Stem Cell Research, Department of Health Science and Technology, Aalborg University, 9220 Aalborg, Denmark.
- Pediatric Surgery Department, Hamad General Hospital, 3050 Doha, Qatar.
- College of Medicine, Qatar University, 2713 Doha, Qatar.
- Surgery Department, Weill Cornell Medicine⁻Qatar, 24144 Doha, Qatar.
| | | | - Cristian P Pennisi
- Laboratory for Stem Cell Research, Department of Health Science and Technology, Aalborg University, 9220 Aalborg, Denmark.
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14
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Dikici S, Mangır N, Claeyssens F, Yar M, MacNeil S. Exploration of 2-deoxy-D-ribose and 17β-Estradiol as alternatives to exogenous VEGF to promote angiogenesis in tissue-engineered constructs. Regen Med 2019; 14:179-197. [PMID: 30793662 DOI: 10.2217/rme-2018-0068] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
Aim: In this study, we explored the angiogenic potential and proangiogenic concentration ranges of 2-deoxy-D-ribose (2dDR) and 17β-Estradiol (E2) in comparison with VEGF. The 2dDR and E2 were then loaded into tissue engineering (TE) scaffolds to investigate their proangiogenic potential when released from fibers. Materials & methods: Ex ovo chick chorioallantoic membrane (CAM) assay was used to evaluate angiogenic activity of 2dDR and E2. Both factors were then introduced into scaffolds via electrospinning to assess their angiogenic potential when released from fibers. Results: Both factors were approximately 80% as potent as VEGF and showed a dose-dependent angiogenic response. The sustained release of both agents from the scaffolds stimulated neovascularization over 7 days in the chorioallantoic membrane assay. Conclusion: We conclude that both 2dDR and E2 provide attractive alternatives to VEGF for the functionalization of tissue engineering scaffolds to promote angiogenesis in vivo.
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Affiliation(s)
- Serkan Dikici
- Department of Materials Science & Engineering, Kroto Research Institute, University of Sheffield, Sheffield, UK
| | - Naşide Mangır
- Department of Materials Science & Engineering, Kroto Research Institute, University of Sheffield, Sheffield, UK.,Department of Urology, Royal Hallamshire Hospital, Sheffield, United Kingdom
| | - Frederik Claeyssens
- Department of Materials Science & Engineering, Kroto Research Institute, University of Sheffield, Sheffield, UK
| | - Muhammad Yar
- Interdisciplinary Research Center in Biomedical Materials (IRCBM), COMSATS University Islamabad, Lahore, Pakistan
| | - Sheila MacNeil
- Department of Materials Science & Engineering, Kroto Research Institute, University of Sheffield, Sheffield, UK
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15
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Huang L, Huang J, Shao H, Hu X, Cao C, Fan S, Song L, Zhang Y. Silk scaffolds with gradient pore structure and improved cell infiltration performance. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2019; 94:179-189. [DOI: 10.1016/j.msec.2018.09.034] [Citation(s) in RCA: 36] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/22/2018] [Revised: 08/06/2018] [Accepted: 09/11/2018] [Indexed: 01/19/2023]
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16
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Cao N, Song L, Liu W, Fan S, Jiang D, Mu J, Gu B, Xu Y, Zhang Y, Huang J. Prevascularized bladder acellular matrix hydrogel/silk fibroin composite scaffolds promote the regeneration of urethra in a rabbit model. Biomed Mater 2018; 14:015002. [DOI: 10.1088/1748-605x/aae5e2] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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17
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Patel A, Xue Y, Hartley R, Sant V, Eles JR, Cui XT, Stolz DB, Sant S. Hierarchically aligned fibrous hydrogel films through microfluidic self-assembly of graphene and polysaccharides. Biotechnol Bioeng 2018; 115:2654-2667. [PMID: 30011077 DOI: 10.1002/bit.26801] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2018] [Revised: 05/25/2018] [Accepted: 06/26/2018] [Indexed: 12/17/2022]
Abstract
Despite significant interest in developing extracellular matrix (ECM)-inspired biomaterials to recreate native cell-instructive microenvironments, the major challenge in the biomaterial field is to recapitulate the complex structural and biophysical features of native ECM. These biophysical features include multiscale hierarchy, electrical conductivity, optimum wettability, and mechanical properties. These features are critical to the design of cell-instructive biomaterials for bioengineering applications such as skeletal muscle tissue engineering. In this study, we used a custom-designed film fabrication assembly, which consists of a microfluidic chamber to allow electrostatic charge-based self-assembly of oppositely charged polymer solutions forming a hydrogel fiber and eventually, a nanocomposite fibrous hydrogel film. The film recapitulates unidirectional hierarchical fibrous structure along with the conductive properties to guide initial alignment and myotube formation from cultured myoblasts. We combined high conductivity, and charge carrier mobility of graphene with biocompatibility of polysaccharides to develop graphene-polysaccharide nanocomposite fibrous hydrogel films. The incorporation of graphene in fibrous hydrogel films enhanced their wettability, electrical conductivity, tensile strength, and toughness without significantly altering their elastic properties (Young's modulus). In a proof-of-concept study, the mouse myoblast cells (C2C12) seeded on these nanocomposite fibrous hydrogel films showed improved spreading and enhanced myogenesis as evident by the formation of multinucleated myotubes, an early indicator of myogenesis. Overall, graphene-polysaccharide nanocomposite fibrous hydrogel films provide a potential biomaterial to promote skeletal muscle tissue regeneration.
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Affiliation(s)
- Akhil Patel
- Department of Pharmaceutical Sciences, School of Pharmacy, University of Pittsburgh, Pittsburgh, Pennsylvania
| | - Yingfei Xue
- Department of Pharmaceutical Sciences, School of Pharmacy, University of Pittsburgh, Pittsburgh, Pennsylvania
| | - Rebecca Hartley
- Department of Pharmaceutical Sciences, School of Pharmacy, University of Pittsburgh, Pittsburgh, Pennsylvania
| | - Vinayak Sant
- Department of Pharmaceutical Sciences, School of Pharmacy, University of Pittsburgh, Pittsburgh, Pennsylvania
| | - James R Eles
- Department of Bioengineering, University of Pittsburgh, Pittsburgh, Pennsylvania.,McGowan Institute for Regenerative Medicine, Pittsburgh, Pennsylvania
| | - Xinyan Tracy Cui
- Department of Bioengineering, University of Pittsburgh, Pittsburgh, Pennsylvania.,McGowan Institute for Regenerative Medicine, Pittsburgh, Pennsylvania.,Center for the Neural Basis of Cognition, University of Pittsburgh, Pittsburgh, Pennsylvania
| | - Donna Beer Stolz
- McGowan Institute for Regenerative Medicine, Pittsburgh, Pennsylvania.,Center for Biologic Imaging, School of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania.,Department of Cell Biology and Pathology, University of Pittsburgh, Pittsburgh, Pennsylvania
| | - Shilpa Sant
- Department of Pharmaceutical Sciences, School of Pharmacy, University of Pittsburgh, Pittsburgh, Pennsylvania.,Department of Bioengineering, University of Pittsburgh, Pittsburgh, Pennsylvania.,McGowan Institute for Regenerative Medicine, Pittsburgh, Pennsylvania
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18
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Experimental characterization and constitutive modeling of the biomechanical behavior of male human urethral tissues validated by histological observations. Biomech Model Mechanobiol 2018; 17:939-950. [PMID: 29380159 DOI: 10.1007/s10237-018-1003-1] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2017] [Accepted: 01/12/2018] [Indexed: 10/18/2022]
Abstract
This work aims at observing the mechanical behavior of the membranous and spongy portions of urethrae sampled on male cadavers in compliance with French regulations on postmortem testing, in accordance with the Scientific Council of body donation center of Grenoble. In this perspective, a thermostatic water tank was designed to conduct ex vivo planar tension tests in a physiological environment, i.e., in a saline solution at a temperature of [Formula: see text] [Formula: see text]. In order to observe the anisotropy of the tissues, the samples were tested in two directions. Tests consisting of a series of load-unload cycles of increasing amplitudes were performed to highlight their viscous behavior. The results were then discussed according to the microstructure of tissue, which was investigated using different staining methods and histological analysis. The observed behaviors were then fitted using an anisotropic hyperelastic or a visco-hyperelastic matrix-fiber model.
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19
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Vocht DE, Kemp V, Iljas J, Bosch JR, Kort LM, Graaf P. A systematic review on cell‐seeded tissue engineering of penile corpora. J Tissue Eng Regen Med 2017; 12:687-694. [DOI: 10.1002/term.2487] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2016] [Revised: 04/20/2017] [Accepted: 05/19/2017] [Indexed: 12/24/2022]
Affiliation(s)
- Dorien E.C.M. Vocht
- Department of UrologyUniversity Medical Centre Utrecht Utrecht The Netherlands
| | - Vincent Kemp
- Department of UrologyUniversity Medical Centre Utrecht Utrecht The Netherlands
| | - J.D. Iljas
- Department of UrologyUniversity Medical Centre Utrecht Utrecht The Netherlands
| | - J.L.H. Ruud Bosch
- Department of UrologyUniversity Medical Centre Utrecht Utrecht The Netherlands
| | - Laetitia M.O. Kort
- Department of UrologyUniversity Medical Centre Utrecht Utrecht The Netherlands
| | - Petra Graaf
- Department of UrologyUniversity Medical Centre Utrecht Utrecht The Netherlands
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20
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Mitra A, Sarin YK. Use of Hormones, Tissue Factors and Bioengineering in the Management of Hypospadias. Indian J Pediatr 2017; 84:564-569. [PMID: 28429283 DOI: 10.1007/s12098-017-2347-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/09/2017] [Accepted: 03/29/2017] [Indexed: 11/26/2022]
Abstract
Hypospadiology is a rapidly evolving field. Progress in the understanding of how hormonal therapy affects the growth of the phallus has allowed surgeons to optimize the tissues for surgery. But conflicting data from a number of studies and a lack of consensus on drugs, their dosing, mode of delivery and timing of use means that the creation of protocols is unlikely to happen in the near future. Nonetheless, there is a hope and the standardization of scientific reporting will make it easier to compare data at the global level. There are reports of the increasing incidence of hypospadias and the etiology is thought to be multifactorial. Although complex interactions between genetic polymorphisms and the environment make it difficult to identify the exact factors responsible for hypospadias, the advent of massively parallel gene sequencing, large scale epigenetic screens and CRISPR technology will definitely ease the process. The knowledge of culprit genes will not only broaden our understanding of embryology and growth but will also enable us to predict and/or modify tissue healing. Advances in tissue engineering are also expected to provide a plethora of biomaterials for urethral reconstruction. The development of this field is directly linked with the elucidation of the processes of proliferation and vascularization coupled with the cataloguing of the growth factors involved. One can safely conclude that the exciting new advances in the field will have far reaching consequences on patient care and counselling.
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Affiliation(s)
- Aparajita Mitra
- Department of Pediatric Surgery, Maulana Azad Medical College and Associated Lok Nayak Hospital, New Delhi, 110002, India
| | - Yogesh Kumar Sarin
- Department of Pediatric Surgery, Maulana Azad Medical College and Associated Lok Nayak Hospital, New Delhi, 110002, India.
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21
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Abstract
Reconstructive urologists are constantly facing diverse and complex pathologies that require structural and functional restoration of urinary organs. There is always a demand for a biocompatible material to repair or substitute the urinary tract instead of using patient's autologous tissues with its associated morbidity. Biomimetic approaches are tissue-engineering tactics aiming to tailor the material physical and biological properties to behave physiologically similar to the urinary system. This review highlights the different strategies to mimic urinary tissues including modifications in structure, surface chemistry, and cellular response of a range of biological and synthetic materials. The article also outlines the measures to minimize infectious complications, which might lead to graft failure. Relevant experimental and preclinical studies are discussed, as well as promising biomimetic approaches such as three-dimensional bioprinting.
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Affiliation(s)
- Moustafa M Elsawy
- Division of Surgery and Interventional Science, Royal Free Hospital, NHS Trust, University College London (UCL)
- Division of Reconstructive Urology, University College London Hospitals (uclh), London, UK
- Urology Department, School of Medicine, Alexandria University, Alexandria, Egypt
| | - Achala de Mel
- Division of Surgery and Interventional Science, Royal Free Hospital, NHS Trust, University College London (UCL)
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22
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Liu Y, Ma W, Liu B, Wang Y, Chu J, Xiong G, Shen L, Long C, Lin T, He D, Butnaru D, Alexey L, Zhang Y, Zhang D, Wei G. Urethral reconstruction with autologous urine-derived stem cells seeded in three-dimensional porous small intestinal submucosa in a rabbit model. Stem Cell Res Ther 2017; 8:63. [PMID: 28279224 PMCID: PMC5345143 DOI: 10.1186/s13287-017-0500-y] [Citation(s) in RCA: 60] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2016] [Revised: 12/31/2016] [Accepted: 02/09/2017] [Indexed: 02/08/2023] Open
Abstract
BACKGROUND Urethral reconstruction is one of the great surgical challenges for urologists. A cell-based tissue-engineered urethra may be an alternative for patients who have complicated long strictures and need urethral reconstruction. Here, we demonstrated the feasibility of using autologous urine-derived stem cells (USCs) seeded on small intestinal submucosa (SIS) to repair a urethral defect in a rabbit model. METHODS Autologous USCs were obtained and characterized, and their capacity to differentiate into urothelial cells (UCs) and smooth muscle cells (SMCs) was tested. Then, USCs were labeled with PKH67, seeded on SIS, and transplanted to repair a urethral defect. The urethral defect model was surgically established in New Zealand white male rabbits. A ventral urethral gap was created, and the urethral mucosa was completely removed, with a mean rabbit penile urethra length of 2 cm. The urethral mucosal defect was repaired with a SIS scaffold (control group: SIS with no USCs; experimental group: autologous USC-seeded SIS; n = 12 for each group). A series of tests, including a retrograde urethrogram, histological analysis, and immunofluorescence, was undertaken 2, 3, 4, and 12 weeks after the operation to evaluate the effect of the autologous USCs on urethral reconstruction. RESULTS Autologous USCs could be easily collected and induced to differentiate into UCs and SMCs. In addition, the urethral caliber, speed of urothelial regeneration, content of smooth muscle, and vessel density were significantly improved in the group with autologous USC-seeded SIS. Moreover, inflammatory cell infiltration and fibrosis were found in the control group with only SIS, but not in the experimental autologous USC-seeded SIS group. Furthermore, immunofluorescence staining demonstrated that the transplanted USCs differentiated into UCs and SMCs in vivo. CONCLUSIONS Autologous USCs can be used as an alternative cell source for cell-based tissue engineering for urethral reconstruction.
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Affiliation(s)
- Yang Liu
- Department of Urology, Children’s Hospital of Chongqing Medical University, Chongqing, 400014 China
- Ministry of Education Key Laboratory of Child Development and Disorders, Chongqing Key Laboratory of Pediatrics, China International Science and Technology Cooperation base of Child development and Critical Disorders, Chongqing Key Laboratory of Child Urogenital Development and Tissue Engineering, Chongqing, 400014 China
| | - Wenjun Ma
- Department of Urology, Children’s Hospital of Chongqing Medical University, Chongqing, 400014 China
- Ministry of Education Key Laboratory of Child Development and Disorders, Chongqing Key Laboratory of Pediatrics, China International Science and Technology Cooperation base of Child development and Critical Disorders, Chongqing Key Laboratory of Child Urogenital Development and Tissue Engineering, Chongqing, 400014 China
- Chongqing Engineering Research Center of Stem Cell Therapy, Children’s Hospital of Chongqing Medical University, Chongqing, China
| | - Bo Liu
- Department of Urology, Children’s Hospital of Chongqing Medical University, Chongqing, 400014 China
- Ministry of Education Key Laboratory of Child Development and Disorders, Chongqing Key Laboratory of Pediatrics, China International Science and Technology Cooperation base of Child development and Critical Disorders, Chongqing Key Laboratory of Child Urogenital Development and Tissue Engineering, Chongqing, 400014 China
| | - Yangcai Wang
- Department of Urology, Children’s Hospital of Chongqing Medical University, Chongqing, 400014 China
- Ministry of Education Key Laboratory of Child Development and Disorders, Chongqing Key Laboratory of Pediatrics, China International Science and Technology Cooperation base of Child development and Critical Disorders, Chongqing Key Laboratory of Child Urogenital Development and Tissue Engineering, Chongqing, 400014 China
| | - Jiaqiang Chu
- Department of Urology, Children’s Hospital of Chongqing Medical University, Chongqing, 400014 China
- Chongqing Engineering Research Center of Stem Cell Therapy, Children’s Hospital of Chongqing Medical University, Chongqing, China
| | - Geng Xiong
- Department of Urology, Children’s Hospital of Chongqing Medical University, Chongqing, 400014 China
- Wake Forest Institute for Regenerative Medicine, Wake Forest School of Medicine, Winston-Salem, NC 27101 USA
| | - Lianju Shen
- Ministry of Education Key Laboratory of Child Development and Disorders, Chongqing Key Laboratory of Pediatrics, China International Science and Technology Cooperation base of Child development and Critical Disorders, Chongqing Key Laboratory of Child Urogenital Development and Tissue Engineering, Chongqing, 400014 China
| | - Chunlan Long
- Ministry of Education Key Laboratory of Child Development and Disorders, Chongqing Key Laboratory of Pediatrics, China International Science and Technology Cooperation base of Child development and Critical Disorders, Chongqing Key Laboratory of Child Urogenital Development and Tissue Engineering, Chongqing, 400014 China
| | - Tao Lin
- Department of Urology, Children’s Hospital of Chongqing Medical University, Chongqing, 400014 China
| | - Dawei He
- Department of Urology, Children’s Hospital of Chongqing Medical University, Chongqing, 400014 China
| | - Denis Butnaru
- Research Institute for Uronephrology, Sechenov First Moscow State Medical University, Moscow, 119991 Russia
| | - Lyundup Alexey
- Biomedical Research Department of Institute of Molecular Medicine, Sechenov First Moscow State Medical University, Moscow, 119991 Russia
| | - Yuanyuan Zhang
- Wake Forest Institute for Regenerative Medicine, Wake Forest School of Medicine, Winston-Salem, NC 27101 USA
| | - Deying Zhang
- Department of Urology, Children’s Hospital of Chongqing Medical University, Chongqing, 400014 China
- Ministry of Education Key Laboratory of Child Development and Disorders, Chongqing Key Laboratory of Pediatrics, China International Science and Technology Cooperation base of Child development and Critical Disorders, Chongqing Key Laboratory of Child Urogenital Development and Tissue Engineering, Chongqing, 400014 China
| | - Guanghui Wei
- Department of Urology, Children’s Hospital of Chongqing Medical University, Chongqing, 400014 China
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Simões IN, Vale P, Soker S, Atala A, Keller D, Noiva R, Carvalho S, Peleteiro C, Cabral JMS, Eberli D, da Silva CL, Baptista PM. Acellular Urethra Bioscaffold: Decellularization of Whole Urethras for Tissue Engineering Applications. Sci Rep 2017; 7:41934. [PMID: 28165009 PMCID: PMC5292742 DOI: 10.1038/srep41934] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2016] [Accepted: 01/03/2017] [Indexed: 11/16/2022] Open
Abstract
Patients with stress urinary incontinence mainly suffer from malfunction of the urethra closure mechanism. We established the decellularization of porcine urethras to produce acellular urethra bioscaffolds for future tissue engineering applications, using bioscaffolds or bioscaffold-derived soluble products. Cellular removal was evaluated by H&E, DAPI and DNA quantification. The presence of specific ECM proteins was assessed through immunofluorescence staining and colorimetric assay kits. Human skeletal muscle myoblasts, muscle progenitor cells and adipose-derived stromal vascular fractions were used to evaluate the recellularization of the acellular urethra bioscaffolds. The mechanochemical decellularization system removed ~93% of tissue's DNA, generally preserving ECM's components and microarchitecture. Recellularization was achieved, though methodological advances are required regarding cell seeding strategies and functional assessment. Through microdissection and partial digestion, different urethra ECM-derived coating substrates were formulated (i.e. containing smooth or skeletal muscle ECM) and used to culture MPCs in vitro. The skeletal muscle ECM substrates enhanced fiber formation leading to the expression of the main skeletal muscle-related proteins and genes, as confirmed by immunofluorescence and RT-qPCR. The described methodology produced a urethra bioscaffold that retained vital ECM proteins and was liable to cell repopulation, a crucial first step towards the generation of urethra bioscaffold-based Tissue Engineering products.
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Affiliation(s)
- Irina N. Simões
- Department of Bioengineering and iBB - Institute for Bioengineering and Biosciences, Instituto Superior Técnico, Universidade de Lisboa, Lisboa, Portugal
- Wake Forest Institute for Regenerative Medicine, Winston-Salem, NC USA
- Laboratory for Tissue Engineering and Stem Cell Therapy, Department of Urology, University Hospital Zurich, Zurich, Switzerland
| | - Paulo Vale
- Serviço Urologia, Hospital Garcia de Orta, Almada, Portugal
| | - Shay Soker
- Wake Forest Institute for Regenerative Medicine, Winston-Salem, NC USA
| | - Anthony Atala
- Wake Forest Institute for Regenerative Medicine, Winston-Salem, NC USA
| | - Daniel Keller
- Laboratory for Tissue Engineering and Stem Cell Therapy, Department of Urology, University Hospital Zurich, Zurich, Switzerland
| | - Rute Noiva
- Faculdade de Medicina Veterinária, The Interdisciplinary Centre of Research in Animal Health (CIISA), Universidade de Lisboa, Lisboa, Portugal
| | - Sandra Carvalho
- Faculdade de Medicina Veterinária, The Interdisciplinary Centre of Research in Animal Health (CIISA), Universidade de Lisboa, Lisboa, Portugal
| | - Conceição Peleteiro
- Faculdade de Medicina Veterinária, The Interdisciplinary Centre of Research in Animal Health (CIISA), Universidade de Lisboa, Lisboa, Portugal
| | - Joaquim M. S. Cabral
- Department of Bioengineering and iBB - Institute for Bioengineering and Biosciences, Instituto Superior Técnico, Universidade de Lisboa, Lisboa, Portugal
| | - Daniel Eberli
- Laboratory for Tissue Engineering and Stem Cell Therapy, Department of Urology, University Hospital Zurich, Zurich, Switzerland
| | - Cláudia L. da Silva
- Department of Bioengineering and iBB - Institute for Bioengineering and Biosciences, Instituto Superior Técnico, Universidade de Lisboa, Lisboa, Portugal
| | - Pedro M. Baptista
- Wake Forest Institute for Regenerative Medicine, Winston-Salem, NC USA
- Instituto de Investigacion Sanitaria de Aragón (IIS Aragon), Zaragoza, Spain
- CIBERehd, Zaragoza, Spain
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24
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Orabi H, Saba I, Rousseau A, Bolduc S. Novel three-dimensional autologous tissue-engineered vaginal tissues using the self-assembly technique. Transl Res 2017; 180:22-36. [PMID: 27543901 DOI: 10.1016/j.trsl.2016.07.019] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/13/2015] [Revised: 07/17/2016] [Accepted: 07/23/2016] [Indexed: 02/08/2023]
Abstract
Many diseases necessitate the substitution of vaginal tissues. Current replacement therapies are associated with many complications. In this study, we aimed to create bioengineered neovaginas with the self-assembly technique using autologous vaginal epithelial (VE) and vaginal stromal (VS) cells without the use of exogenous materials and to document the survival and incorporation of these grafts into the tissues of nude female mice. Epithelial and stromal cells were isolated from vaginal biopsies. Stromal cells were driven to form collagen sheets, 3 of which were superimposed to form vaginal stromas. VE cells were seeded on top of these stromas and allowed to mature in an air-liquid interface. The vaginal equivalents were implanted subcutaneously in female nude mice, which were sacrificed after 1 and 2 weeks after surgery. The in vitro and animal-retrieved equivalents were assessed using histologic, functional, and mechanical evaluations. Vaginal equivalents could be handled easily. VE cells formed a well-differentiated epithelial layer with a continuous basement membrane. The equivalent matrix was composed of collagen I and III and elastin. The epithelium, basement membrane, and stroma were comparable to those of native vaginal tissues. The implanted equivalents formed mature vaginal epithelium and matrix that were integrated into the mice tissues. Using the self-assembly technique, in vitro vaginal tissues were created with many functional and biological similarities to native vagina without any foreign material. They formed functional vaginal tissues after in vivo animal implantation. It is appropriate for vaginal substitution and disease modeling for infectious studies, vaginal applicants, and drug testing.
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Affiliation(s)
- Hazem Orabi
- Centre de recherche en organogénèse expérimentale de l'Université Laval/LOEX, Faculté de médecine, Axe Médecine Régénératrice, Centre de Recherche du CHU de Québec, Université Laval, Québec, Canada; Department of Surgery, Université Laval, Québec, Canada; Department of Urology, Assiut University, Assiut, Egypt.
| | - Ingrid Saba
- Centre de recherche en organogénèse expérimentale de l'Université Laval/LOEX, Faculté de médecine, Axe Médecine Régénératrice, Centre de Recherche du CHU de Québec, Université Laval, Québec, Canada; Department of Surgery, Université Laval, Québec, Canada
| | - Alexandre Rousseau
- Centre de recherche en organogénèse expérimentale de l'Université Laval/LOEX, Faculté de médecine, Axe Médecine Régénératrice, Centre de Recherche du CHU de Québec, Université Laval, Québec, Canada; Department of Surgery, Université Laval, Québec, Canada
| | - Stéphane Bolduc
- Centre de recherche en organogénèse expérimentale de l'Université Laval/LOEX, Faculté de médecine, Axe Médecine Régénératrice, Centre de Recherche du CHU de Québec, Université Laval, Québec, Canada; Department of Surgery, Université Laval, Québec, Canada.
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Electrospun Poly(l-lactide)/Poly(ethylene glycol) Scaffolds Seeded with Human Amniotic Mesenchymal Stem Cells for Urethral Epithelium Repair. Int J Mol Sci 2016; 17:ijms17081262. [PMID: 27517902 PMCID: PMC5000660 DOI: 10.3390/ijms17081262] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2016] [Revised: 07/21/2016] [Accepted: 07/27/2016] [Indexed: 12/27/2022] Open
Abstract
Tissue engineering-based urethral replacement holds potential for repairing large segmental urethral defects, which remains a great challenge at present. This study aims to explore the potential of combining biodegradable poly(l-lactide) (PLLA)/poly(ethylene glycol) (PEG) scaffolds and human amniotic mesenchymal cells (hAMSCs) for repairing urethral defects. PLLA/PEG fibrous scaffolds with various PEG fractions were fabricated via electrospinning. The scaffolds were then seeded with hAMSCs prior to implantation in New Zealand male rabbits that had 2.0 cm-long defects in the urethras. The rabbits were randomly divided into three groups. In group A, hAMSCs were grown on PLLA/PEG scaffolds for two days and then implanted to the urethral defects. In group B, only the PLLA/PEG scaffolds were used to rebuild the rabbit urethral defect. In group C, the urethral defect was reconstructed using a regular urethral reparation technique. The repair efficacy was compared among the three groups by examining the urethral morphology, tissue reconstruction, luminal patency, and complication incidence (including calculus formation, urinary fistula, and urethral stricture) using histological evaluation and urethral radiography methods. Findings from this study indicate that hAMSCs-loaded PLLA/PEG scaffolds resulted in the best urethral defect repair in rabbits, which predicts the promising application of a tissue engineering approach for urethral repair.
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Natali AN, Carniel EL, Frigo A, Pavan PG, Todros S, Pachera P, Fontanella CG, Rubini A, Cavicchioli L, Avital Y, De Benedictis GM. Experimental investigation of the biomechanics of urethral tissues and structures. Exp Physiol 2016; 101:641-56. [PMID: 26864993 DOI: 10.1113/ep085476] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2015] [Accepted: 02/04/2016] [Indexed: 12/20/2022]
Abstract
NEW FINDINGS What is the central question of this study? Prostheses for treatment of urinary incontinence elicit complications associated with an inadequate mechanical action. This investigation aimed to define a procedure addressed to urethral mechanical characterization. Experimental tests are the basis for constitutive formulation, with a view to numerical modelling for investigation of the interaction between the tissues and a prosthesis. What is the main finding and its importance? Horse urethra, selected for its histomorphometric similarity to human urethra, was characterized by integrated histological analysis and mechanical tests on the biological tissue and structure, leading to constitutive formulation. A non-linear, anisotropic and time-dependent response was found, representing a valid basis for development of a numerical model to interpret the functional behaviour of the urethra. Urinary dysfunction can lead to incontinence, with an impact on the quality of life. Severe dysfunction can be overcome surgically by the use of an artificial urinary sphincter. Nonetheless, several complications may result from inappropriate functioning of the prosthesis, in many instances resulting from an unsuitable mechanical action of the device on the urethral tissues. Computational models allow investigation of the mechanical interaction between biological tissues and biomedical devices, representing a potential support for surgical practice and prosthesis design. The development of such computational tools requires experimental data on the mechanics of biological tissues and structures, which are rarely reported in the literature. The aim of this study was to provide a procedure for the mechanical characterization of urethral tissues and structures. The experimental protocol included the morphometric and histological analysis of urethral tissues, the mechanical characterization of the response of tissues to tensile and stress-relaxation tests and evaluation of the behaviour of urethral structures by inflation tests. Results from the preliminary experiments were processed, adopting specific model formulations, and also providing the definition of parameters that characterize the elastic and viscous behaviour of the tissues. Different experimental protocols, leading to a comprehensive set of experimental data, allow for a reciprocal assessment of reliability of the investigation approach.
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Affiliation(s)
- Arturo Nicola Natali
- Department of Industrial Engineering, University of Padova, Italy.,Centre for Mechanics of Biological Materials, University of Padova, Italy
| | - Emanuele Luigi Carniel
- Department of Industrial Engineering, University of Padova, Italy.,Centre for Mechanics of Biological Materials, University of Padova, Italy
| | - Alessandro Frigo
- Department of Industrial Engineering, University of Padova, Italy.,Centre for Mechanics of Biological Materials, University of Padova, Italy
| | - Piero Giovanni Pavan
- Department of Industrial Engineering, University of Padova, Italy.,Centre for Mechanics of Biological Materials, University of Padova, Italy
| | - Silvia Todros
- Department of Industrial Engineering, University of Padova, Italy.,Centre for Mechanics of Biological Materials, University of Padova, Italy
| | - Paola Pachera
- Department of Industrial Engineering, University of Padova, Italy.,Centre for Mechanics of Biological Materials, University of Padova, Italy
| | - Chiara Giulia Fontanella
- Centre for Mechanics of Biological Materials, University of Padova, Italy.,Department of Biomedical Sciences, University of Padova, Italy
| | - Alessandro Rubini
- Centre for Mechanics of Biological Materials, University of Padova, Italy.,Department of Biomedical Sciences, University of Padova, Italy
| | - Laura Cavicchioli
- Department of Comparative Biomedicine and Food Science, University of Padova, Italy
| | - Yochai Avital
- Department of Animal Medicine, Production and Health, University of Padova, Italy
| | - Giulia Maria De Benedictis
- Centre for Mechanics of Biological Materials, University of Padova, Italy.,Department of Animal Medicine, Production and Health, University of Padova, Italy
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Development of a cell-seeded modified small intestinal submucosa for urethroplasty. Heliyon 2016; 2:e00087. [PMID: 27441265 PMCID: PMC4946073 DOI: 10.1016/j.heliyon.2016.e00087] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2015] [Revised: 01/28/2016] [Accepted: 03/01/2016] [Indexed: 11/21/2022] Open
Abstract
OBJECTIVE To explore the feasibility of a modified 3D porous small intestinal submucosa (SIS) scaffold seeded with urothelial cells (UC) for surgical reconstruction in a rabbit model. MATERIAL AND METHODS Eighteen New England white male rabbits were divided into three groups and a 0.8 × 1.5 cm(2) section of the anterior urethral mucosa was removed from each animal. Ventral onlay urethroplasty was performed with a 1.0 × 1.7 cm(2) SIS scaffold that was either cell-seeded and treated with 5% peracetic acid (PAA) (n = 6), or cell-seeded and untreated (n = 6), or unseeded and treated with 5% PAA (n = 6). Animals were sacrificed at 6 months post-repair and retrograde urethrography and histological analyses performed. RESULTS In animals implanted with cell-seeded and PAA treated SIS scaffolds, urethrography showed wide-caliber urethra without any signs of stricture or fistulae, and histological analyses confirmed a complete urethral structure. In contrast, ulceration and fistula occurred in the reconstructed urethra of animals implanted with cell-seeded but untreated SIS scaffolds, and evident stricture was present in the unseeded, PAA treated group. Histological analyses demonstrated less urothelial coverage and smooth muscle in the cell-seeded and untreated SIS scaffold group, and serious fibrosis formation occurred in the unseeded, treated group. CONCLUSIONS A modified 3D porous SIS scaffold seeded with UC and treated with PAA produces better urethroplasty results than cell-seeded untreated SIS scaffolds, or unseeded PAA treated SIS scaffolds.
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Atala A, Danilevskiy M, Lyundup A, Glybochko P, Butnaru D, Vinarov A, Yoo JJ. The potential role of tissue-engineered urethral substitution: clinical and preclinical studies. J Tissue Eng Regen Med 2015; 11:3-19. [PMID: 26631921 DOI: 10.1002/term.2112] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2015] [Revised: 10/01/2015] [Accepted: 10/15/2015] [Indexed: 01/10/2023]
Abstract
Urethral strictures and anomalies remain among the difficult problems in urology, with urethroplasty procedures being the most effective treatment options. The two major types of urethroplasty are anastomotic urethroplasty and widening the urethral lumen using flaps or grafts (i.e. substitution urethroplasty). However, no ideal material for the latter has been found so far. Designing and selecting such a material is a necessary and challenging endeavour, driving the need for further bioengineered urethral tissue research. This article reviews currently available studies on the potentialities of tissue engineering in urethral reconstruction, in particular those describing the use of both acellular and recellularized tissue-engineered constructs in animal and human models. Possible future developments in this field are also discussed. Copyright © 2015 John Wiley & Sons, Ltd.
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Affiliation(s)
- Anthony Atala
- Wake Forest School of Medicine, Winston-Salem, NC, USA
| | - Mikhail Danilevskiy
- Research Institute of Uronephrology and Reproductive Health, I. M. Sechenov First Moscow State Medical University, Moscow, Russian Federation
| | - Alexey Lyundup
- Research Institute of Molecular Medicine, I. M. Sechenov First Moscow State Medical University, Moscow, Russian Federation
| | - Petr Glybochko
- I. M. Sechenov First Moscow State Medical University, Moscow, Russian Federation
| | - Denis Butnaru
- Research Institute of Uronephrology and Reproductive Health, I. M. Sechenov First Moscow State Medical University, Moscow, Russian Federation
| | - Andrey Vinarov
- Research Institute of Uronephrology and Reproductive Health, I. M. Sechenov First Moscow State Medical University, Moscow, Russian Federation
| | - James J Yoo
- Wake Forest Institute for Regenerative Medicine, Wake Forest University, Winston-Salem, NC, USA
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Orabi H, Rousseau A, Laterreur V, Bolduc S. Optimization of the current self-assembled urinary bladder model: Organ-specific stroma and smooth muscle inclusion. Can Urol Assoc J 2015; 9:E599-607. [PMID: 26425221 DOI: 10.5489/cuaj.2953] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
INTRODUCTION Due to the complications associated with the use of non-native biomaterials and the lack of local tissues, bioengineered tissues are required for surgical reconstruction of complex urinary tract diseases, including those of the urinary bladder. The self-assembly method of matrix formation using autologous stromal cells obviates the need for exogenous biomaterials. We aimed at creating novel ex-vivo multilayer urinary tissue from a single bladder biopsy. METHODS After isolating urothelial, bladder stromal and smooth muscle cells from bladder biopsies, we produced 2 models of urinary equivalents: (1) the original one with dermal fibroblasts and (2) the new one with bladder stromal cells. Dermal fibroblasts and bladder stromal cells were stimulated to form an extracellular matrix, followed by sequential seeding of smooth muscle cells and urothelial cells. Stratification and cellular differentiation were assessed by histology, immunostaining and electron microscopy. Barrier function was checked with the permeability test. Biomechanical properties were assessed with uniaxinal tensile strength, elastic modulus, and failure strain. RESULTS Both urinary equivalents could be handled easily and did not contract. Stratified epithelium, intact basement membrane, fused matrix, and prominent muscle layer were detected in both urinary equivalents. Bladder stromal cell-based constructs had terminally differentiated urothelium and more elasticity than dermal fibroblasts-based equivalents. Permeation studies showed that both equivalents were comparable to native tissues. CONCLUSIONS Organ-specific stromal cells produced urinary tissues with more terminally differentiated urothelium and better biomechanical characteristics than non-specific stromal cells. Smooth muscle cells could be incorporated into the self-assembled tissues effectively. This multilayer tissue can be used as a urethral graft or as a bladder model for disease modelling and pharmacotherapeutic testing.
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Affiliation(s)
- Hazem Orabi
- Centre de recherche en organogénèse expérimentale de l'Université Laval/LOEX, Faculté de médecine, Université Laval, QC; ; Surgery Department (Urology Service), Université Laval, QC
| | - Alexandre Rousseau
- Centre de recherche en organogénèse expérimentale de l'Université Laval/LOEX, Faculté de médecine, Université Laval, QC
| | - Veronique Laterreur
- Centre de recherche en organogénèse expérimentale de l'Université Laval/LOEX, Faculté de médecine, Université Laval, QC
| | - Stephane Bolduc
- Centre de recherche en organogénèse expérimentale de l'Université Laval/LOEX, Faculté de médecine, Université Laval, QC; ; Surgery Department (Urology Service), Université Laval, QC
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Zhao Y, He Y, Guo JH, Wu JS, Zhou Z, Zhang M, Li W, Zhou J, Xiao DD, Wang Z, Sun K, Zhu YJ, Lu MJ. Time-dependent bladder tissue regeneration using bilayer bladder acellular matrix graft-silk fibroin scaffolds in a rat bladder augmentation model. Acta Biomater 2015; 23:91-102. [PMID: 26049152 DOI: 10.1016/j.actbio.2015.05.032] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2014] [Revised: 05/22/2015] [Accepted: 05/28/2015] [Indexed: 12/11/2022]
Abstract
With advances in tissue engineering, various synthetic and natural biomaterials have been widely used in tissue regeneration of the urinary bladder in rat models. However, reconstructive procedures remain insufficient due to the lack of appropriate scaffolding, which should provide a waterproof barrier function and support the needs of various cell types. To address these problems, we have developed a bilayer scaffold comprising a porous network (silk fibroin [SF]) and an underlying natural acellular matrix (bladder acellular matrix graft [BAMG]) and evaluated its feasibility and potential for bladder regeneration in a rat bladder augmentation model. Histological (hematoxylin and eosin and Masson's trichrome staining) and immunohistochemical analyses demonstrated that the bilayer BAMG-SF scaffold promoted smooth muscle, blood vessel, and nerve regeneration in a time-dependent manner. At 12weeks after implantation, bladders reconstructed with the BAMG-SF matrix displayed superior structural and functional properties without significant local tissue responses or systemic toxicity. These results demonstrated that the bilayer BAMG-SF scaffold may be a promising scaffold with good biocompatibility for bladder regeneration in the rat bladder augmentation model.
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Affiliation(s)
- Yang Zhao
- Department of Urology, Shanghai Ninth People's Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai 200011, China
| | - Yi He
- Department of Urology, Jiaxing First Hospital, Jiaxing, Zhejiang Province 314001, China
| | - Jian-Hua Guo
- Department of Urology, Shanghai Ninth People's Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai 200011, China
| | - Jia-Sheng Wu
- State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Zhe Zhou
- Department of Urology, Shanghai Ninth People's Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai 200011, China
| | - Ming Zhang
- Department of Urology, Shanghai Ninth People's Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai 200011, China
| | - Wei Li
- State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Juan Zhou
- Department of Urology, Shanghai Ninth People's Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai 200011, China
| | - Dong-Dong Xiao
- Department of Urology, Shanghai Ninth People's Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai 200011, China
| | - Zhong Wang
- Department of Urology, Shanghai Ninth People's Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai 200011, China.
| | - Kang Sun
- State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Ying-Jian Zhu
- Department of Urology, Shanghai First People's Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai 200080, China.
| | - Mu-Jun Lu
- Department of Urology, Shanghai Ninth People's Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai 200011, China.
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Lv XG, Feng C, Fu Q, Xie H, Wang Y, Huang JW, Xie MK, Atala A, Xu YM, Zhao WX. Comparative study of different seeding methods based on a multilayer SIS scaffold: Which is the optimal procedure for urethral tissue engineering? J Biomed Mater Res B Appl Biomater 2015; 104:1098-108. [DOI: 10.1002/jbm.b.33460] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2015] [Revised: 04/27/2015] [Accepted: 05/13/2015] [Indexed: 12/11/2022]
Affiliation(s)
- Xiang-Guo Lv
- Department of Urology; Shanghai Jiao Tong University Affiliated Sixth People's Hospital; Shanghai People's Republic of China
| | - Chao Feng
- Department of Urology; Shanghai Jiao Tong University Affiliated Sixth People's Hospital; Shanghai People's Republic of China
| | - Qiang Fu
- Department of Urology; Shanghai Jiao Tong University Affiliated Sixth People's Hospital; Shanghai People's Republic of China
| | - Hong Xie
- Department of Urology; Shanghai Jiao Tong University Affiliated Sixth People's Hospital; Shanghai People's Republic of China
| | - Ying Wang
- Department of Urology; Shanghai Jiao Tong University Affiliated Sixth People's Hospital; Shanghai People's Republic of China
| | - Jian-Wen Huang
- Department of Urology; Shanghai Jiao Tong University Affiliated Sixth People's Hospital; Shanghai People's Republic of China
| | - Min-Kai Xie
- Department of Urology; Shanghai Jiao Tong University Affiliated Sixth People's Hospital; Shanghai People's Republic of China
| | - Anthony Atala
- Wake Forest Institute for Regenerative Medicine, Wake Forest University; Winston-Salem North Carolina
| | - Yue-Min Xu
- Department of Urology; Shanghai Jiao Tong University Affiliated Sixth People's Hospital; Shanghai People's Republic of China
| | - Wei-Xin Zhao
- Wake Forest Institute for Regenerative Medicine, Wake Forest University; Winston-Salem North Carolina
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Li Z, Liu Q, Wang H, Song L, Shao H, Xie M, Xu Y, Zhang Y. Bladder Acellular Matrix Graft Reinforced Silk Fibroin Composite Scaffolds Loaded VEGF with Aligned Electrospun Fibers in Multiple Layers. ACS Biomater Sci Eng 2015; 1:238-246. [PMID: 33435048 DOI: 10.1021/ab5001436] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
| | | | | | - Lujie Song
- Department
of Urology, Shanghai Jiao Tong University Affiliated Sixth People’s Hospital, Shanghai 200233, P. R. China
| | | | - Minkai Xie
- Department
of Urology, Shanghai Jiao Tong University Affiliated Sixth People’s Hospital, Shanghai 200233, P. R. China
| | - Yuemin Xu
- Department
of Urology, Shanghai Jiao Tong University Affiliated Sixth People’s Hospital, Shanghai 200233, P. R. China
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Ribeiro-Filho LA, Sievert KD. Acellular matrix in urethral reconstruction. Adv Drug Deliv Rev 2015; 82-83:38-46. [PMID: 25477304 DOI: 10.1016/j.addr.2014.11.019] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2014] [Revised: 11/21/2014] [Accepted: 11/24/2014] [Indexed: 01/10/2023]
Abstract
The treatment of severe urethral stenosis has always been a challenge even for skilled urologists. Classic urethroplasty, skin flaps and buccal mucosa grafting may not be used for long and complex strictures. In the quest for an ideal urethral substitute, acellular scaffolds have demonstrated the ability to induce tissue regeneration layer by layer. After several experimental studies, the use of acellular matrices for urethral reconstruction has become a clinical reality over the last decade. In this review we analyze advantages and limitations of both biological and polymeric scaffolds that have been reported in experimental and human studies. Important aspects such as graft extension, surgical technique and cell-seeding versus cell-free grafts will be discussed.
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Application of bladder acellular matrix in urinary bladder regeneration: the state of the art and future directions. BIOMED RESEARCH INTERNATIONAL 2015; 2015:613439. [PMID: 25793199 PMCID: PMC4352424 DOI: 10.1155/2015/613439] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 08/17/2014] [Revised: 11/15/2014] [Accepted: 11/18/2014] [Indexed: 12/14/2022]
Abstract
Construction of the urinary bladder de novo using tissue engineering technologies is the “holy grail” of reconstructive urology. The search for the ideal biomaterial for urinary bladder reconstruction has been ongoing for decades. One of the most promising biomaterials for this purpose seems to be bladder acellular matrix (BAM). In this review we determine the most important factors, which may affect biological and physical properties of BAM and its regeneration potential in tissue engineered urinary bladder. We also point out the directions in modification of BAM, which include incorporation of exogenous growth factors into the BAM structure. Finally, we discuss the results of the urinary bladder regeneration with cell seeded BAM.
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Li Z, Song L, Huang X, Wang H, Shao H, Xie M, Xu Y, Zhang Y. Tough and VEGF-releasing scaffolds composed of artificial silk fibroin mats and a natural acellular matrix. RSC Adv 2015. [DOI: 10.1039/c4ra16146g] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The blend and coaxially electrospun RSF/BAMG composite scaffolds loaded VEGF exhibited good cell compatibility with improved mechanical properties.
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Affiliation(s)
- Zhaobo Li
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials
- College of Materials Science and Engineering
- Donghua University
- Shanghai 201620
- P. R. China
| | - Lujie Song
- Department of Urology
- Shanghai Jiao Tong University Affiliated Sixth People's Hospital
- Shanghai 200233
- P. R. China
| | - Xiangyu Huang
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials
- College of Materials Science and Engineering
- Donghua University
- Shanghai 201620
- P. R. China
| | - Hongsheng Wang
- College of Chemistry
- Chemical Engineering and Biotechnology
- Donghua University
- Shanghai 201620
- P. R. China
| | - Huili Shao
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials
- College of Materials Science and Engineering
- Donghua University
- Shanghai 201620
- P. R. China
| | - Minkai Xie
- Department of Urology
- Shanghai Jiao Tong University Affiliated Sixth People's Hospital
- Shanghai 200233
- P. R. China
| | - Yuemin Xu
- Department of Urology
- Shanghai Jiao Tong University Affiliated Sixth People's Hospital
- Shanghai 200233
- P. R. China
| | - Yaopeng Zhang
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials
- College of Materials Science and Engineering
- Donghua University
- Shanghai 201620
- P. R. China
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Abstract
Repair and reconstruction of damaged tissues and organs has been a major issue in the medical field. Regenerative medicine and tissue engineering, as rapid evolving technologies, may offer alternative treatments and hope for patients with serious defects and end-stage diseases. Most urologic diseases could benefit from the development of regenerative medicine and tissue engineering. This article discusses the role of cells and materials in regenerative medicine, as well as the status of current role of regenerative medicine for the generation of specific urologic organs.
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Affiliation(s)
- Chao Zhang
- Wake Forest Institute for Regenerative Medicine, Wake Forest School of Medicine, Medical Center Boulevard, Winston-Salem, North Carolina 27157; Department of Urology, Changhai Hospital, Second Military Medical University, Shanghai, China
| | - Sean V Murphy
- Wake Forest Institute for Regenerative Medicine, Wake Forest School of Medicine, Medical Center Boulevard, Winston-Salem, North Carolina 27157
| | - Anthony Atala
- Wake Forest Institute for Regenerative Medicine, Wake Forest School of Medicine, Medical Center Boulevard, Winston-Salem, North Carolina 27157.
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Arenas da Silva LF, Micol L, Tiemessen D, van Kuppevelt TH, Frey P, Oosterwijk E, Geutjes P, Feitz WF. Is There a Need for Smooth Muscle Cell Transplantation in Urethral Reconstruction? Tissue Eng Part A 2014; 20:1542-9. [DOI: 10.1089/ten.tea.2013.0185] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Affiliation(s)
| | - Lionel Micol
- Institute for Bioengineering, School of Life Sciences and School of Engineering, École Polytechnique Fédérale de Lausanne, Lausanne, Switzerland
| | - Dorien Tiemessen
- Department of Urology, Radboud University Nijmegen, Medical Centre, Nijmegen, Netherlands
| | - Toin H. van Kuppevelt
- Department of Biochemistry, Radboud University Nijmegen Medical Centre, NCMLS, Nijmegen, Netherlands
| | - Peter Frey
- Institute for Bioengineering, School of Life Sciences and School of Engineering, École Polytechnique Fédérale de Lausanne, Lausanne, Switzerland
| | - Egbert Oosterwijk
- Department of Urology, Radboud University Nijmegen, Medical Centre, Nijmegen, Netherlands
| | - Paul Geutjes
- Department of Urology, Radboud University Nijmegen, Medical Centre, Nijmegen, Netherlands
| | - Wout F. Feitz
- Institute for Bioengineering, School of Life Sciences and School of Engineering, École Polytechnique Fédérale de Lausanne, Lausanne, Switzerland
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Sayeg K, Freitas-Filho LG, Waitzberg ÂFL, Arias VEA, Laks M, Egydio FM, Oliveira AS. Integration of collagen matrices into the urethra when implanted as onlay graft. Int Braz J Urol 2014; 39:414-23. [PMID: 23849574 DOI: 10.1590/s1677-5538.ibju.2013.03.16] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2012] [Accepted: 04/29/2013] [Indexed: 01/10/2023] Open
Abstract
OBJECTIVE To assess the integration of decellularized heterologous collagen matrices into the urethra, when implanted with no cells or when seeded with autologous smooth muscle cells. MATERIALS AND METHODS Eighteen New Zealand rabbits were randomly assigned to two groups: Group I (n = 9) - animals undergoing urethral segment resection with interposition of a patch of heterologous collagen matrix seeded with autologous smooth muscle cells; Group II (n = 9) - animals undergoing resection of a urethral segment with interposition of a decellularized heterologous collagen matrix patch. Two animals from each group were sacrificed on postoperative days seven, fourteen and twenty-eight; three animals from each group were sacrificed at the end of three postoperative months. At the end of the third month one animal from each group underwent urethroscopy for urethral integrity assessment and one animal from each group had its microcirculation image captured by a SDF device (Side-stream Dark Field - Microscan Analysis Software). One animal from each group in each euthanasia period underwent cystourethrography so as the urethra could be viewed at flow time. The matrices integration was assessed through histological examination using hematoxylin and eosin (H & E), Masson trichrome (MT), Picrosirius red and Von Willebrand staining. In a blind study with two pathologists all the slides were studied. RESULTS The matrices whether seeded or not with autologous muscle cells were able to restore the architecture of the urethra, but were eliminated from the first week on, before incorporation. Microcirculation of the neourethra, at the end of the third month, showed the same characteristics as a normal urethra in both groups of animals. CONCLUSION Natural heterologous matrices implanted in the urethra as onlay graft were not incorporated into its walls but were able to fully restore the cell architecture of the organ, regardless of being seeded or not with autologous muscle cells.
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Affiliation(s)
- Kleber Sayeg
- Department of Surgery, Federal University of Sao Paulo, Brazil
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Sun D, Yang Y, Wei Z, Xu Y, Zhang X, Hong B. Engineering of pre-vascularized urethral patch with muscle flaps and hypoxia-activated hUCMSCs improves its therapeutic outcome. J Cell Mol Med 2014; 18:434-43. [PMID: 24460735 PMCID: PMC3955150 DOI: 10.1111/jcmm.12157] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2013] [Accepted: 09/09/2013] [Indexed: 01/01/2023] Open
Abstract
Tissue engineering has brought new hopes for urethral reconstruction. However, the absence of pre-vascularization and the subsequent degradation of materials often lead to the failure of in vivo application. In this study, with the assistance of hypoxia-activated human umbilical cord mesenchymal stem cells (hUCMSCs), pedicled muscle flaps were used as materials and pre-incubated in ventral penile subcutaneous cavity of rabbit for 3 weeks to prepare a pre-vascularized urethral construct. We found that small vessels and muscle fibres were scattered in the construct after 3 weeks' pre-incubation. The construct presented a fibrous reticular structure, which was similar to that of the corpus spongiosum under microscope examination. The produced constructs were then used as a patch graft for reconstruction of the defective rabbit urethra (experimental group), natural muscular patch was used as control (control group). Twelve weeks after the reconstructive surgery, urethrography and urethroscope inspections showed wide calibres of the reconstructed urethra in the experimental group. Histopathological studies revealed that fibrous connective tissues and abundant muscle fibres constituted the main body of the patch-grafted urethra. In contrast, in the control group, only adipose tissue was found in the stenosis-reconstructed urethra, replacing the originally grafted muscular tissue. To our knowledge, this is the first report that successfully constructed a pre-vascularized urethral construct by using hypoxia-activated hUCMSC and pedicled muscle flaps. More importantly, the pre-vascularized construct showed a good performance in urethral reconstruction when applied in vivo. The study provided a novel strategy for tissue engineering of pre-vascularized urethral construct for the defective urethra, representing a further advancement in urethral reconstruction.
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Affiliation(s)
- Dongchong Sun
- Department of Urology, People's Liberation Army General Hospital, Beijing, China
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Del Gaudio C, Vianello A, Bellezza G, Maulà V, Sidoni A, Zucchi A, Bianco A, Porena M. Evaluation of electrospun bioresorbable scaffolds for tissue-engineered urinary bladder augmentation. Biomed Mater 2013; 8:045013. [PMID: 23860081 DOI: 10.1088/1748-6041/8/4/045013] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Tissue engineering represents a potential and valuable approach for the treatment of urologic pathologies. Bioresorbable polymeric scaffolds can be regarded as effective platforms to surgically treat bladder diseases and subsequently guide the formation of novel tissue after implantation. To this aim, the evaluation of electrospun scaffolds made up of poly(ε-caprolactone) blended with poly(3-hydroxybutyrate-co-3-hydroxyvalerate) is presented here. Firstly, the microstructure and the viscoelastic/mechanical properties of the electrospun fabrics were investigated. Then, the in vivo response was assessed by performing a urinary bladder augmentation using female Wistar rats as an animal model. 15 days after the surgical procedure, the scaffolds were covered by regenerative urothelium up to 50%, which increased to 50-100% after 30 days. These encouraging results, collected in the 90-day follow-up, clearly showed the potential applications of tissue engineering in the urologic field. A longer in vivo evaluation is currently underway.
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Affiliation(s)
- Costantino Del Gaudio
- Department of Industrial Engineering, INSTM Research Unit Roma Tor Vergata, University of Rome Tor Vergata, Rome, Italy.
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Tissue engineering and ureter regeneration: is it possible? Int J Artif Organs 2013; 36:392-405. [PMID: 23645581 DOI: 10.5301/ijao.5000130] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/11/2012] [Indexed: 12/11/2022]
Abstract
Large ureter damages are difficult to reconstruct. Current techniques are complicated, difficult to perform, and often associated with failures. The ureter has never been regenerated thus far. Therefore the use of tissue engineering techniques for ureter reconstruction and regeneration seems to be a promising way to resolve these problems. For proper ureter regeneration the following problems must be considered: the physiological aspects of the tissue, the type and shape of the scaffold, the type of cells, and the specific environment (urine).
This review presents tissue engineering achievements in the field of ureter regeneration focusing on the scaffold, the cells, and ureter healing.
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Abstract
The field of tissue engineering is rapidly progressing. Much work has gone into developing a tissue engineered urethral graft. Current grafts, when long, can create initial donor site morbidity. In this article, we evaluate the progress made in finding a tissue engineered substitute for the human urethra. Researchers have investigated cell-free and cell-seeded grafts. We discuss different approaches to developing these grafts and review their reported successes in human studies. With further work, tissue engineered grafts may facilitate the management of lengthy urethral strictures requiring oral mucosa substitution urethroplasty.
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Corona BT, Machingal MA, Criswell T, Vadhavkar M, Dannahower AC, Bergman C, Zhao W, Christ GJ. Further development of a tissue engineered muscle repair construct in vitro for enhanced functional recovery following implantation in vivo in a murine model of volumetric muscle loss injury. Tissue Eng Part A 2012; 18:1213-28. [PMID: 22439962 DOI: 10.1089/ten.tea.2011.0614] [Citation(s) in RCA: 107] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Volumetric muscle loss (VML) can result from trauma and surgery in civilian and military populations, resulting in irrecoverable functional and cosmetic deficits that cannot be effectively treated with current therapies. Previous work evaluated a bioreactor-based tissue engineering approach in which muscle derived cells (MDCs) were seeded onto bladder acellular matrices (BAM) and mechanically preconditioned. This first generation tissue engineered muscle repair (TEMR) construct exhibited a largely differentiated cellular morphology consisting primarily of myotubes, and moreover, significantly improved functional recovery within 2 months of implantation in a murine latissimus dorsi (LD) muscle with a surgically created VML injury. The present report extends these initial observations to further document the importance of the cellular phenotype and composition of the TEMR construct in vitro to the functional recovery observed following implantation in vivo. To this end, three distinct TEMR constructs were created by seeding MDCs onto BAM as follows: (1) a short-term cellular proliferation of MDCs to generate primarily myoblasts without bioreactor preconditioning (TEMR-1SP), (2) a prolonged cellular differentiation and maturation period that included bioreactor preconditioning (TEMR-1SPD; identical to the first generation TEMR construct), and (3) similar treatment as TEMR-1SPD but with a second application of MDCs during bioreactor preconditioning (TEMR-2SPD); simulating aspects of "exercise" in vitro. Assessment of maximal tetanic force generation on retrieved LD muscles in vitro revealed that TEMR-1SP and TEMR-1SPD constructs promoted either an accelerated (i.e., 1 month) or a prolonged (i.e., 2 month postinjury) functional recovery, respectively, of similar magnitude. Meanwhile, TEMR-2SPD constructs promoted both an accelerated and prolonged functional recovery, resulting in twice the magnitude of functional recovery of either TEMR-1SP or TEMR-1SPD constructs. Histological and molecular analyses indicated that TEMR constructs mediated functional recovery via regeneration of functional muscle fibers either at the interface of the construct and the native tissue or within the BAM scaffolding independent of the native tissue. Taken together these findings are encouraging for the further development and clinical application of TEMR constructs as a VML injury treatment.
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Affiliation(s)
- Benjamin T Corona
- Wake Forest Institute for Regenerative Medicine, Wake Forest University Baptist Medical Center, Winston-Salem, North Carolina, USA
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Wang Z, He Y, Yu X, Fu W, Wang W, Huang H. Rapid vascularization of tissue-engineered vascular grafts in vivo by endothelial cells in co-culture with smooth muscle cells. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2012; 23:1109-17. [PMID: 22331376 DOI: 10.1007/s10856-012-4576-8] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/19/2011] [Accepted: 01/31/2012] [Indexed: 05/15/2023]
Abstract
A major challenge facing the development of tissue-engineered vascular grafts (TEVGs), promising living replacements for diseased vascular structures, is enhancing angiogenesis. To promote rapid vascularization, endothelial cells (ECs) were co-cultured with smooth muscle cells (SMCs) in decellularized small intestinal submucosa scaffolds to regenerate angiogenic-TEVGs (A-TEVGs). Observation of the A-TEVGs at 1 month post-implantation revealed that a rich network of neocapillaries lining the blood vessel wall had developed; that the ECs of the neovasculatures had been derived from previously seeded ECs and later invading ECs of the host's vascular bed; that tissue vascularization had not significantly impaired mechanical properties; and that the maximal tensile strength of the A-TEVGs was of the same order of magnitude as that of native porcine femoral arteries. These results indicate that of the co-culturing of ECs with SMCs could enhance vascularization of TEVGs in vivo, possibly increasing graft perfusion and host integration.
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Affiliation(s)
- Zhenyu Wang
- Department of Pediatric Thoracic and Cardiovascular Surgery, Shanghai Children's Medical Center, School of Medicine, Shanghai Jiaotong University, Shanghai, China
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Qin HH, Dunn JC. Small intestinal submucosa seeded with intestinal smooth muscle cells in a rodent jejunal interposition model. J Surg Res 2011; 171:e21-6. [PMID: 21937060 PMCID: PMC3195903 DOI: 10.1016/j.jss.2011.08.001] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2011] [Revised: 07/06/2011] [Accepted: 08/01/2011] [Indexed: 01/29/2023]
Abstract
BACKGROUND Small intestinal submucosa (SIS) is a porcine-derived, acellular, collagen-based matrix that has been tested without seeded smooth muscle cells (SMCs) for intestinal tissue engineering. We examined the expression patterns of contractile proteins of SIS with SMCs implanted in an in vivo rodent model. MATERIALS AND METHODS Intestinal SMCs were isolated from Lewis rat pups. Four-ply tubular SMCs-seeded SIS or blank SIS scaffolds were implanted in an adult rat jejunal interposition model. Recipients were sacrificed at 2, 4, and 8 wk following the implantation. The retrieved specimens were examined using antibodies against contractile proteins of SMCs. RESULTS Cultured intestinal SMCs expressed α-smooth muscle actin (α-SMA), calponin, and less smooth muscle myosin heavy chain (SM-MHC) in vitro. Cell-seeded SIS scaffolds contracted significantly over 8 wk of implantation but were comparable to SIS scaffolds without cell seeding. Implanted cell-seeded SIS scaffolds at 2 wk expressed extensive α-SMA, some calponin, and minimal SM-MHC. At 4 wk, α-SMA-expressing cells decreased significantly, whereas calponin or SM-MHC expressing cells were rarely detected. A small number of α-SMA-expressing cells were present at 8 wk, whereas more calponin or SM-MHC expressing cells emerged in proximity with the anastomotic interface. CONCLUSIONS Cell-seeded SIS contracted significantly after implantation, but the expressions of contractile proteins were present at the site of SIS interposition. No organized smooth muscle was formed at the site of implantation. A better scaffold design is needed to produce structured smooth muscle.
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Affiliation(s)
- Harry H. Qin
- Department of Surgery, University of California, Los Angeles, California
| | - James C.Y. Dunn
- Department of Surgery, University of California, Los Angeles, California
- Department of Bioengineering, University of California, Los Angeles, California
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Cozad MJ, Bachman SL, Grant SA. Assessment of decellularized porcine diaphragm conjugated with gold nanomaterials as a tissue scaffold for wound healing. J Biomed Mater Res A 2011; 99:426-34. [PMID: 21887737 DOI: 10.1002/jbm.a.33182] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2011] [Revised: 05/11/2011] [Accepted: 05/19/2011] [Indexed: 01/22/2023]
Abstract
One million Americans suffer from chronic wounds every year with diabetics and older populations representing the majority. Mechanisms that may be responsible for the reduced healing response in these patients include reduction in growth factors or vascularization and an increase in free radical levels. The focus of this study was to develop a biocompatible gold/porcine diaphragm scaffold capable of sustaining fibroblast attachment and proliferation which was measured using viability and dsDNA assays. The free radical scavenging properties, as measured by ROS assays, were also investigated as a mechanism for improving the wound environment. Results indicated 69-89% viability for gold nanoparticle (AuNP) scaffolds and 51-74% for gold nanorod (AuNR) scaffolds as compared to 100% for decellularized scaffolds and 77% for crosslinked scaffolds. All scaffolds exhibited good cell attachment while AuNP-1X scaffolds showed the greatest cell proliferation with a 74% increase in dsDNA content from Day 3 to 7. AuNP-2X and AuNP-4X scaffolds generated higher levels of free radicals with AuNP-4X generating over twice as much as decellularized scaffolds. This study suggests the capability for gold/porcine diaphragm scaffolds to enhance cell proliferation while the modification of free radical generation appears to be dependent on nanomaterial shape and concentration.
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Affiliation(s)
- Matthew J Cozad
- Department of Biological Engineering, University of Missouri, Columbia, Missouri, USA
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Shahin K, Doran PM. Strategies for enhancing the accumulation and retention of extracellular matrix in tissue-engineered cartilage cultured in bioreactors. PLoS One 2011; 6:e23119. [PMID: 21858004 PMCID: PMC3156118 DOI: 10.1371/journal.pone.0023119] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2011] [Accepted: 07/09/2011] [Indexed: 11/18/2022] Open
Abstract
Production of tissue-engineered cartilage involves the synthesis and accumulation of key constituents such as glycosaminoglycan (GAG) and collagen type II to form insoluble extracellular matrix (ECM). During cartilage culture, macromolecular components are released from nascent tissues into the medium, representing a significant waste of biosynthetic resources. This work was aimed at developing strategies for improving ECM retention in cartilage constructs and thus the quality of engineered tissues produced in bioreactors. Human chondrocytes seeded into polyglycolic acid (PGA) scaffolds were cultured in perfusion bioreactors for up to 5 weeks. Analysis of the size and integrity of proteoglycans in the constructs and medium showed that full-sized aggrecan was being stripped from the tissues without proteolytic degradation. Application of low (0.075 mL min(-1)) and gradually increasing (0.075-0.2 mL min(-1)) medium flow rates in the bioreactor resulted in the generation of larger constructs, a 4.0-4.4-fold increase in the percentage of GAG retained in the ECM, and a 4.8-5.2-fold increase in GAG concentration in the tissues compared with operation at 0.2 mL min(-1). GAG retention was also improved by pre-culturing seeded scaffolds in flasks for 5 days prior to bioreactor culture. In contrast, GAG retention in PGA scaffolds infused with alginate hydrogel did not vary significantly with medium flow rate or pre-culture treatment. This work demonstrates that substantial improvements in cartilage quality can be achieved using scaffold and bioreactor culture strategies that specifically target and improve ECM retention.
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Affiliation(s)
- Kifah Shahin
- School of Biotechnology and Biomolecular Sciences, University of New South Wales, Sydney, New South Wales, Australia
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Human urine-derived stem cells seeded in a modified 3D porous small intestinal submucosa scaffold for urethral tissue engineering. Biomaterials 2010; 32:1317-26. [PMID: 21055807 DOI: 10.1016/j.biomaterials.2010.10.006] [Citation(s) in RCA: 131] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2010] [Accepted: 10/03/2010] [Indexed: 11/20/2022]
Abstract
The goal of this study was to determine whether urothelial cells (UC) and smooth muscle cells (SMC) derived from the differentiation of urine-derived stem cells (USC) could be used to form engineered urethral tissue when seeded on a modified 3-D porous small intestinal submucosa (SIS) scaffold. Cells were obtained from 12 voided urine samples from 4 healthy individuals. USC were isolated, characterized and induced to differentiate into UC and SMC. Fresh SIS derived from pigs was decellularized with 5% peracetic acid (PAA). Differentiated UC and SMC derived from USC were seeded onto SIS scaffolds with highly porous microstructure in a layered co-culture fashion and cultured under dynamic conditions for one week. The seeded cells formed multiple uniform layers on the SIS and penetrated deeper into the porous matrix during dynamic culture. USC that were induced to differentiate also expressed UC markers (Uroplakin-III and AE1/AE3) or SMC markers (α-SM actin, desmin, and myosin) after implantation into athymic mice for one month, and the resulting tissues were similar to those formed when UC and SMC derived from native ureter were used. In conclusion, UC and SMC derived from USC could be maintained on 3-D porous SIS scaffold. The dynamic culture system promoted 3-D cell-matrix ingrowth and development of a multilayer mucosal structure similar to that of native urinary tract tissue. USC may serve as an alternative cell source in cell-based tissue engineering for urethral reconstruction or other urological tissue repair.
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Tottey S, Johnson SA, Crapo PM, Reing JE, Zhang L, Jiang H, Medberry CJ, Reines B, Badylak SF. The effect of source animal age upon extracellular matrix scaffold properties. Biomaterials 2010; 32:128-36. [PMID: 20870285 DOI: 10.1016/j.biomaterials.2010.09.006] [Citation(s) in RCA: 83] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2010] [Accepted: 09/02/2010] [Indexed: 11/19/2022]
Abstract
Biologic scaffold materials composed of mammalian extracellular matrix (ECM) are commonly used for the repair and reconstruction of injured tissues. An important, but unexplored variable of biologic scaffolds is the age of the animal from which the ECM is prepared. The objective of the present study was to compare the structural, mechanical, and compositional properties of small intestinal submucosa (SIS)-ECM harvested from pigs that differed only in age. Degradation product bioactivity of these ECM materials was also examined. Results showed that there are distinct differences in each of these variables among the various age source ECM scaffolds. The strength and growth factors content of ECM from 3-week-old animals is less than that of ECM harvested from 12, 26 or >52-week-old animals. The elastic modulus of SIS-ECM for 3 week and >52-week-old source was less than that of the 12 and 26 week source. Degradation products from all age source ECMs were chemotactic for perivascular stem cells, with the 12 week source the most potent, while the oldest source caused the greatest increase in proliferation. In summary, distinct differences exist in the mechanical, structural, and biologic properties of SIS-ECM harvested from different aged animals.
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Affiliation(s)
- Stephen Tottey
- McGowan Institute for Regenerative Medicine, Department of Bioengineering, University of Pittsburgh, Bridgeside Point Building II, 450 Technology Dr. Suite 300, Pittsburgh, PA 15219, USA
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Mangera A, Chapple CR. Tissue engineering in urethral reconstruction. F1000 MEDICINE REPORTS 2010; 2:65. [PMID: 21173862 PMCID: PMC2990502 DOI: 10.3410/m2-65] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Tissue engineering is an exciting and rapidly evolving technology. In this review, we discuss the recent progress made in the field of urethral reconstruction and consider the clinical implications and further advancement of these endeavours.
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Affiliation(s)
- Altaf Mangera
- Department of Urology Research, Sheffield Teaching Hospitals NHS TrustRoyal Hallamshire Hospital, Sheffield, S10 2JFUK
| | - Christopher R Chapple
- Department of Urology Research, Sheffield Teaching Hospitals NHS TrustRoyal Hallamshire Hospital, Sheffield, S10 2JFUK
- Sheffield Hallam University38-40 Howard Street, Sheffield, S1 1WBUK
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