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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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Shamri R, Xenakis JJ, Spencer LA. Eosinophils in innate immunity: an evolving story. Cell Tissue Res 2010; 343:57-83. [PMID: 21042920 DOI: 10.1007/s00441-010-1049-6] [Citation(s) in RCA: 155] [Impact Index Per Article: 11.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2010] [Accepted: 09/01/2010] [Indexed: 12/27/2022]
Abstract
Eosinophils are innate immune leukocytes found in relatively low numbers within the blood. Terminal effector functions of eosinophils, deriving from their capacity to release their content of tissue-destructive cationic proteins, have historically been considered primary effector mechanisms against specific parasites, and are likewise implicated in tissue damage accompanying allergic responses such as asthma. However, the past decade has seen dramatic advancements in the field of eosinophil immunobiology, revealing eosinophils to also be key participants in many other facets of innate immunity, from bridging innate and adaptive immune responses to orchestrating tissue remodeling events. Here, we review the multifaceted functions of eosinophils in innate immunity that are currently known, and discuss new avenues in this evolving story.
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Affiliation(s)
- Revital Shamri
- Division of Allergy and Inflammation, Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215, USA
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Ashley RA, Palmer BW, Schultz AD, Woodson BW, Roth CC, Routh JC, Fung KM, Frimberger D, Lin HK, Kropp BP. Leukocyte Inflammatory Response in a Rat Urinary Bladder Regeneration Model Using Porcine Small Intestinal Submucosa Scaffold. Tissue Eng Part A 2009; 15:3241-6. [DOI: 10.1089/ten.tea.2008.0699] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Affiliation(s)
- Richard A. Ashley
- Department of Urology, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma
| | - Blake W. Palmer
- Department of Urology, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma
| | - Andrew D. Schultz
- Department of Urology, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma
| | - Benjamin W. Woodson
- Department of Urology, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma
| | - Christopher C. Roth
- Department of Urology, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma
| | - Jonathan C. Routh
- Harvard School of Public Health, Harvard Medical School, Boston, Massachusetts
| | - Kar-Ming Fung
- Department of Pathology, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma
- U.S. Department of Veterans Affairs Medical Center, Oklahoma City, Oklahoma
| | - Dominic Frimberger
- Department of Urology, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma
| | - Hsueh-Kung Lin
- Department of Urology, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma
- U.S. Department of Veterans Affairs Medical Center, Oklahoma City, Oklahoma
| | - Bradley P. Kropp
- Department of Urology, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma
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Ashley RA, Roth CC, Palmer BW, Kibar Y, Routh JC, Fung KM, Frimberger D, Lin HK, Kropp BP. Regional variations in small intestinal submucosa evoke differences in inflammation with subsequent impact on tissue regeneration in the rat bladder augmentation model. BJU Int 2009; 105:1462-8. [PMID: 19863527 DOI: 10.1111/j.1464-410x.2009.08965.x] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
OBJECTIVE To examine the histological differences in the inflammatory response and regenerative outcomes of distal vs proximal porcine small intestinal submucosa (SIS) grafts in the rat bladder, as SIS from distal small intestine yields reliable and reproducible bladder regeneration, while SIS from proximal portions of small intestine does not provide similar results. MATERIALS AND METHODS In all, 30 Sprague-Dawley rats underwent hemi-cystectomy followed by anastomosis of a bladder patch of SIS prepared from either distal or proximal small intestine. After bladder harvest, immunohistochemistry was used to quantify mast cells, eosinophils, macrophages, and neutrophils (PMNs). Total cell count per unit area was compared across the time course in univariate and logistic regression modelling. RESULTS There were more eosinophils and mast cells in proximal SIS grafts, while there were more macrophages and PMNs in distal SIS grafts (all P < 0.05). Trichrome analysis showed increased collagen deposition in proximal SIS grafts and little smooth muscle regeneration. There was also significant graft contracture in proximal SIS grafts compared with distal SIS grafts (P < 0.05). CONCLUSIONS We conclude that the location of SIS origin may evoke different inflammatory responses, which results in altered bladder tissue regeneration.
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Affiliation(s)
- Richard A Ashley
- Department of Urology, University of Oklahoma Health Sciences Center, Oklahoma City, OK 73104, USA
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