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Nguyen T, Gundogdu G, Bottini C, Chaudhuri AK, Mauney JR. Evaluation of Bi-layer Silk Fibroin Grafts for Inlay Vaginoplasty in a Rat Model. Tissue Eng Regen Med 2024:10.1007/s13770-024-00653-1. [PMID: 38822221 DOI: 10.1007/s13770-024-00653-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2024] [Revised: 04/24/2024] [Accepted: 05/13/2024] [Indexed: 06/02/2024] Open
Abstract
BACKGROUND Autologous tissues derived from bowel, buccal mucosa and skin are primarily used to repair or replace diseased vaginal segments as well as create neovaginas for male-to-female transgenders. These grafts are often limited by scarce tissue supply, donor site morbidity and post-operative complications. Bi-layer silk fibroin (BLSF) biomaterials represent potential alternatives for vaginoplasty given their structural strength and elasticity, low immunogenicity, and processing flexibility. The goals of the current study were to assess the potential of acellular BLSF scaffolds for vaginal tissue regeneration in respect to conventional small intestinal submucosal (SIS) matrices in a rat model of vaginoplasty. METHODS Inlay vaginoplasty was performed with BLSF and SIS scaffolds (N = 21 per graft) in adult female rats for up to 2 months of implantation. Nonsurgical controls (N = 4) were investigated in parallel. Outcome analyses included histologic, immunohistochemical and histomorphometric evaluations of wound healing patterns; µ-computed tomography (CT) of vaginal continuity; and breeding assessments. RESULTS Animals in both scaffold cohorts exhibited 100% survival rates with no severe post-operative complications. At 2 months post-op, µ-CT analysis revealed normal vaginal anatomy and continuity in both graft groups similar to controls. In parallel, BLSF and SIS grafts also induced comparable constructive remodeling patterns and were histologically equivalent in their ability to support formation of vascularized vaginal neotissues with native tissue architecture, however with significantly less smooth muscle content. Vaginal tissues reconstructed with both implants were capable of supporting copulation, pregnancy and similar amounts of live births. CONCLUSIONS BLSF biomaterials represent potential "off-the-shelf" candidates for vaginoplasty.
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Affiliation(s)
- Travis Nguyen
- Department of Biomedical Engineering, University of California, Irvine, Irvine, CA, USA
| | - Gokhan Gundogdu
- Department of Urology, University of California, Irvine, Building 55, 101 The City Drive South., Rm. 300, Orange, CA, USA
| | - Christina Bottini
- Department of Biomedical Engineering, University of California, Irvine, Irvine, CA, USA
| | - Ambika K Chaudhuri
- Department of Biomedical Engineering, University of California, Irvine, Irvine, CA, USA
| | - Joshua R Mauney
- Department of Urology, University of California, Irvine, Building 55, 101 The City Drive South., Rm. 300, Orange, CA, USA.
- Department of Biomedical Engineering, University of California, Irvine, Irvine, CA, USA.
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Elia E, Caneparo C, McMartin C, Chabaud S, Bolduc S. Tissue Engineering for Penile Reconstruction. Bioengineering (Basel) 2024; 11:230. [PMID: 38534504 DOI: 10.3390/bioengineering11030230] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2023] [Revised: 02/19/2024] [Accepted: 02/23/2024] [Indexed: 03/28/2024] Open
Abstract
The penis is a complex organ with a development cycle from the fetal stage to puberty. In addition, it may suffer from either congenital or acquired anomalies. Penile surgical reconstruction has been the center of interest for many researchers but is still challenging due to the complexity of its anatomy and functionality. In this review, penile anatomy, pathologies, and current treatments are described, including surgical techniques and tissue engineering approaches. The self-assembly technique currently applied is emphasized since it is considered promising for an adequate tissue-engineered penile reconstructed substitute.
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Affiliation(s)
- Elissa Elia
- Centre de Recherche en Organogénèse Expérimentale/LOEX, Regenerative Medicine Division, CHU de Québec-Université Laval Research Center, Québec, QC G1J 1Z4, Canada
| | - Christophe Caneparo
- Centre de Recherche en Organogénèse Expérimentale/LOEX, Regenerative Medicine Division, CHU de Québec-Université Laval Research Center, Québec, QC G1J 1Z4, Canada
| | - Catherine McMartin
- Division of Urology, Department of Surgery, CHU de Québec-Université Laval, Québec, QC G1V 4G2, Canada
| | - Stéphane Chabaud
- Centre de Recherche en Organogénèse Expérimentale/LOEX, Regenerative Medicine Division, CHU de Québec-Université Laval Research Center, Québec, QC G1J 1Z4, Canada
| | - Stéphane Bolduc
- Centre de Recherche en Organogénèse Expérimentale/LOEX, Regenerative Medicine Division, CHU de Québec-Université Laval Research Center, Québec, QC G1J 1Z4, Canada
- Division of Urology, Department of Surgery, CHU de Québec-Université Laval, Québec, QC G1V 4G2, Canada
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Gundogdu G, Nguyen T, Hosseini Sharifi SH, Starek S, Costa K, Jones CE, Barham D, Gelman J, Clayman RV, Mauney JR. Evaluation of silk fibroin-based urinary conduits in a porcine model of urinary diversion. Front Bioeng Biotechnol 2023; 11:1100507. [PMID: 36726743 PMCID: PMC9885082 DOI: 10.3389/fbioe.2023.1100507] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2022] [Accepted: 01/03/2023] [Indexed: 01/17/2023] Open
Abstract
Background: The primary strategy for urinary diversion in radical cystectomy patients involves incorporation of autologous gastrointestinal conduits into the urinary tract which leads to deleterious consequences including chronic infections and metabolic abnormalities. This report investigates the efficacy of an acellular, tubular bi-layer silk fibroin (BLSF) graft to function as an alternative urinary conduit in a porcine model of urinary diversion. Materials and methods: Unilateral urinary diversion with stented BLSF conduits was executed in five adult female, Yucatan mini-swine over a 3 month period. Longitudinal imaging analyses including ultrasonography, retrograde ureteropyelography and video-endoscopy were carried out monthly. Histological, immunohistochemical (IHC), and histomorphometric assessments were performed on neoconduits at harvest. Results: All animals survived until scheduled euthanasia and displayed moderate hydronephrosis (Grades 1-3) in reconstructed collecting systems over the course of the study period. Stented BLSF constructs supported formation of vascularized, retroperitoneal tubes capable of facilitating external urinary drainage. By 3 months post-operative, neoconduits contained α-smooth muscle actin+ and SM22α+ smooth muscle as well as uroplakin 3A+ and pan-cytokeratin + urothelium. However, the degree of tissue regeneration in neotissues was significantly lower in comparison to ureteral controls as determined by histomorphometry. In addition, neoconduit stenting was necessary to prevent stomal occlusion. Conclusion: BLSF biomaterials represent emerging platforms for urinary conduit construction and may offer a functional replacement for conventional urinary diversion techniques following further optimization of mechanical properties and regenerative responses.
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Affiliation(s)
- Gokhan Gundogdu
- Department of Urology, University of California, Irvine, Orange, CA, United States
| | - Travis Nguyen
- Department of Biomedical Engineering, University of California, Irvine, Irvine, CA, United States
| | | | - Stephanie Starek
- Department of Urology, University of California, Irvine, Orange, CA, United States
| | - Kyle Costa
- Department of Urology, University of California, Irvine, Orange, CA, United States
| | - Clara E. Jones
- Department of Biomedical Engineering, University of California, Irvine, Irvine, CA, United States
| | - David Barham
- Department of Urology, University of California, Irvine, Orange, CA, United States
| | - Joel Gelman
- Department of Urology, University of California, Irvine, Orange, CA, United States
| | - Ralph V. Clayman
- Department of Urology, University of California, Irvine, Orange, CA, United States
| | - Joshua R. Mauney
- Department of Urology, University of California, Irvine, Orange, CA, United States,Department of Biomedical Engineering, University of California, Irvine, Irvine, CA, United States,*Correspondence: Joshua R. Mauney,
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Song B, Fang L, Mao X, Ye X, Yan Z, Ma Q, Shi Z, Hu Y, Zhu Y, Cheng Y. Gelatin-grafted tubular asymmetric scaffolds promote ureteral regeneration via activation of the integrin/Erk signaling pathway. Front Bioeng Biotechnol 2023; 10:1092543. [PMID: 36686259 PMCID: PMC9849368 DOI: 10.3389/fbioe.2022.1092543] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2022] [Accepted: 12/13/2022] [Indexed: 01/06/2023] Open
Abstract
Introduction: The repair of a diseased ureter is an urgent clinical issue that needs to be solved. A tissue-engineered scaffold for ureteral replacement is currently insufficient due to its incompetent bioactivity, especially in long-segment abnormalities. The primary reason is the failure of urothelialization on scaffolds. Methods: In this work, we investigated the ability of gelatin-grafted tubular scaffold in ureteral repairment and its related biological mechanism. We designed various porous asymmetric poly (L-lactic acid) (PLLA)/poly (L-lactide-co-e-caprolactone) (PLCL) tubes with a thermally induced phase separation (TIPS) method via a change in the ratio of solvents (named PP). To regulate the phenotype of urothelial cells and ureteral reconstruction, gelatin was grafted onto the tubular scaffold using ammonolysis and glutaraldehyde crosslinking (named PP-gel). The in vitro and in vivo experiments were performed to test the biological function and the mechanism of the scaffolds. Results and Discussion: The hydrophilicity of the scaffold significantly increased after gelatin grafting, which promoted the adhesion and proliferation of urothelial cells. Through subcutaneous implantation in rats, PP-gel scaffolds demonstrated good biocompatibility. The in vivo replacement showed that PP-gel could improve urothelium regeneration and maintain renal function after the ureter was replaced with an ∼4 cm-long PP-gel tube using New Zealand rabbits as the experimental animals. The related biologic mechanism of ureteral reconstruction was detected in detail. The gelatin-grafted scaffold upgraded the integrin α6/β4 on the urothelial cell membrane, which phosphorylates the focal adhesion kinase (FAK) and enhances urothelialization via the MAPK/Erk signaling pathway. Conclusion: All these results confirmed that the PP46-gel scaffold is a promising candidate for the constitution of an engineered ureter and to repair long-segment ureteral defects.
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Affiliation(s)
- Baiyang Song
- School of Medicine, Ningbo University, Ningbo, China,Department of Urology, Ningbo First Hospital, Ningbo, China
| | - Li Fang
- Department of Urology, Ningbo First Hospital, Ningbo, China,Ningbo Clinical Research Center for Urological Disease, Ningbo, China
| | - Xufeng Mao
- School of Medicine, Ningbo University, Ningbo, China
| | - Xianwang Ye
- Department of Radiology, Ningbo First Hospital, Ningbo, China
| | - Zejun Yan
- Department of Urology, Ningbo First Hospital, Ningbo, China,Ningbo Clinical Research Center for Urological Disease, Ningbo, China
| | - Qi Ma
- Department of Urology, Ningbo First Hospital, Ningbo, China,Ningbo Clinical Research Center for Urological Disease, Ningbo, China
| | - Zewen Shi
- School of Medicine, Ningbo University, Ningbo, China
| | - Yiwei Hu
- School of Medicine, Ningbo University, Ningbo, China
| | - Yabin Zhu
- School of Medicine, Ningbo University, Ningbo, China,*Correspondence: Yabin Zhu, ; Yue Cheng,
| | - Yue Cheng
- Department of Urology, Ningbo First Hospital, Ningbo, China,Ningbo Clinical Research Center for Urological Disease, Ningbo, China,*Correspondence: Yabin Zhu, ; Yue Cheng,
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符 舟, 肖 树, 符 伟. [Research advances of three-dimensional bioprinting technology in urinary system tissue engineering]. SHENG WU YI XUE GONG CHENG XUE ZA ZHI = JOURNAL OF BIOMEDICAL ENGINEERING = SHENGWU YIXUE GONGCHENGXUE ZAZHI 2022; 39:639-644. [PMID: 35788535 PMCID: PMC10950772 DOI: 10.7507/1001-5515.202107061] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Received: 07/22/2021] [Revised: 04/14/2022] [Indexed: 06/15/2023]
Abstract
For the damage and loss of tissues and organs caused by urinary system diseases, the current clinical treatment methods have limitations. Tissue engineering provides a therapeutic method that can replace or regenerate damaged tissues and organs through the research of cells, biological scaffolds and biologically related molecules. As an emerging manufacturing technology, three-dimensional (3D) bioprinting technology can accurately control the biological materials carrying cells, which further promotes the development of tissue engineering. This article reviews the research progress and application of 3D bioprinting technology in tissue engineering of kidney, ureter, bladder, and urethra. Finally, the main current challenges and future prospects are discussed.
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Affiliation(s)
- 舟洋 符
- 解放军医学院(北京 100853)Chinese PLA Medical School, Beijing 100853, P. R. China
| | - 树伟 肖
- 解放军医学院(北京 100853)Chinese PLA Medical School, Beijing 100853, P. R. China
| | - 伟军 符
- 解放军医学院(北京 100853)Chinese PLA Medical School, Beijing 100853, P. R. China
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