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Zhou Q, Li L, Li J. Stem cells with decellularized liver scaffolds in liver regeneration and their potential clinical applications. Liver Int 2015; 35:687-94. [PMID: 24797694 DOI: 10.1111/liv.12581] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/15/2014] [Accepted: 04/27/2014] [Indexed: 02/13/2023]
Abstract
End-stage hepatic failure is a potentially life-threatening condition for which orthotopic liver transplantation (OLT) is the only effective treatment. However, a shortage of available donor organs for transplantation each year results in the death of many patients waiting for liver transplantation. Cell-based therapies and hepatic tissue engineering have been considered as alternatives to liver transplantation. However, primary hepatocyte transplantation has rarely produced therapeutic effects because mature hepatocytes cannot be effectively expanded in vitro, and the availability of hepatocytes is often limited by shortages of donor organs. Decellularization is an attractive technique for scaffold preparation in stem cell-based liver engineering, as the resulting material can potentially retain the liver architecture, native vessel network and specific extracellular matrix (ECM). Thus, the reconstruction of functional and practical liver tissue using decellularized scaffolds becomes possible. This review focuses on the current understanding of liver tissue engineering, whole-organ liver decellularization techniques, cell sources for recellularization and potential clinical applications and challenges.
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Affiliation(s)
- Qian Zhou
- State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, The First Affiliated Hospital, School of Medicine, Zhejiang University, 79 Qingchun Rd., Hangzhou, 310003, China
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Khanna O, Moya ML, Opara EC, Brey EM. Synthesis of multilayered alginate microcapsules for the sustained release of fibroblast growth factor-1. J Biomed Mater Res A 2011; 95:632-40. [PMID: 20725969 DOI: 10.1002/jbm.a.32883] [Citation(s) in RCA: 60] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Alginate microcapsules coated with a permselective poly-L-ornithine (PLO) membrane have been investigated for the encapsulation and transplantation of islets as a treatment for type 1 diabetes. The therapeutic potential of this approach could be improved through local stimulation of microvascular networks to meet mass transport demands of the encapsulated cells. Fibroblast growth factor-1 (FGF-1) is a potent angiogenic factor with optimal effect occurring when it is delivered in a sustained manner. In this article, a technique is described for the generation of multilayered alginate microcapsules with an outer alginate layer that can be used for the delivery of FGF-1. The influence of alginate concentration and composition (high mannuronic acid (M) or guluronic acid (G) content) on outer layer size and stability, protein encapsulation efficiency, and release kinetics was investigated. The technique results in a stable outer layer of alginate with a mean thickness between 113 and 164 μm, increasing with alginate concentration and G-content. The outer layer was able to encapsulate and release FGF-1 for up to 30 days, with 1.25% of high G alginate displaying the most sustained release. The released FGF-1 retained its biologic activity in the presence of heparin, and the addition of the outer layer did not alter the permselectivity of the PLO coat. This technique could be used to generate encapsulation systems that deliver proteins to stimulate local neovascularization around encapsulated islets.
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Affiliation(s)
- Omaditya Khanna
- Department of Chemical and Biological Engineering, Illinois Institute of Technology, Chicago, Illinois, USA
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Khanna O, Moya ML, Greisler HP, Opara EC, Brey EM. Multilayered microcapsules for the sustained-release of angiogenic proteins from encapsulated cells. Am J Surg 2011; 200:655-8. [PMID: 21056148 DOI: 10.1016/j.amjsurg.2010.08.001] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2010] [Revised: 08/06/2010] [Accepted: 08/06/2010] [Indexed: 11/30/2022]
Abstract
BACKGROUND Multilayered alginate microcapsules with a permselective poly-L-ornithine membrane can be used for the dual purpose of encapsulating cells in the inner core and sustained release of angiogenic proteins from the outer layer. The aim of this study was to examine the encapsulation and release of a novel chimeric form of fibroblast growth factor-1 (FGF-1) from the outer layer of alginate microcapsules. METHODS Heparin-binding growth-associated molecule bound to FGF-1 (HB-GAM/FGF-1) was encapsulated in the outer layer of multilayered alginate microbeads constructed using varying alginate conditions. The encapsulation and release of the chimera was quantified. RESULTS The outer layer was able to encapsulate and release HB-GAM/FGF-1 for up to 30 days. The outer layer made with 1% alginate of high mannuronic acid content provided the fastest release, while 1.25% high guluronic acid content alginate displayed the longest duration of release. CONCLUSIONS The outer layer of multilayered alginate microbeads can be used for the encapsulation and long-term release of HB-GAM/FGF-1.
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Affiliation(s)
- Omaditya Khanna
- Department of Chemical and Biological Engineering, Illinois Institute of Technology, Chicago, IL, USA
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Pang Y, Wang X, Ucuzian AA, Brey EM, Burgess WH, Jones KJ, Alexander TD, Greisler HP. Local delivery of a collagen-binding FGF-1 chimera to smooth muscle cells in collagen scaffolds for vascular tissue engineering. Biomaterials 2009; 31:878-85. [PMID: 19853908 DOI: 10.1016/j.biomaterials.2009.10.007] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2009] [Accepted: 10/02/2009] [Indexed: 11/17/2022]
Abstract
We investigated the delivery of R136K-CBD (a collagen-binding mutant chimera of fibroblast growth factor-1) with a type I collagen scaffold as the delivery vehicle to smooth muscle cells (SMCs) for vascular tissue engineering. The binding affinity of R136K-CBD to 3-D collagen scaffolds was investigated both in the presence and absence of cells and/or salts. 2-D and 3-D visualization of delivery of R136K-CBD into SMCs were accomplished by combined fluorescent and reflection confocal microscopy. The mitogenic effect of collagen-immobilized R136K-CBD on SMCs in 3-D collagen was studied by Cyquant assay at different time intervals. In the group devoid of salt and cells, no detectable release of R136K-CBD into overlying culture media was found, compared with burst-and-continuous release of R136K and FGF-1 over a 14-day period in all other groups. The release rate of R136K-CBD was 1.7 and 1.6-fold less than R-136K and FGF-1 when media was supplemented with 2m salt (P<0.0001), and 2.6 and 2.5-fold less in cell-populated collagen hydrogels (P<0.0001), respectively. R136K-CBD showed essentially uniform binding to collagen and its distribution was dependent on that of the collagen scaffold. Internalization of R136K-CBD into SMCs was documented by confocal microscopy. 3-D local delivery of collagen-immobilized R136K-CBD increased the proliferation of SMCs in the collagen matrix to significantly greater levels and for a significantly greater duration than R136K or FGF-1, with 2.0 and 2.1-fold more mitogenicity than R136K and FGF-1 respectively (P<0.0001) at day 7. The results suggest that our collagen-binding fusion protein is an effective strategy for growth factor delivery for vascular tissue engineering.
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MESH Headings
- Animals
- Biocompatible Materials/chemistry
- Biomimetic Materials/chemistry
- Blood Vessels/growth & development
- Cell Culture Techniques/methods
- Cells, Cultured
- Collagen/chemistry
- Crystallization/methods
- Dogs
- Drug Carriers/chemistry
- Fibroblast Growth Factor 1/administration & dosage
- Fibroblast Growth Factor 1/chemistry
- Materials Testing
- Muscle, Smooth, Vascular/cytology
- Muscle, Smooth, Vascular/drug effects
- Muscle, Smooth, Vascular/physiology
- Myocytes, Smooth Muscle/cytology
- Myocytes, Smooth Muscle/drug effects
- Myocytes, Smooth Muscle/physiology
- Particle Size
- Surface Properties
- Tissue Engineering/methods
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Affiliation(s)
- Yonggang Pang
- Department of Surgery, Loyola University Medical Center, Maywood, IL 60153, USA
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Brewster L, Brey EM, Addis M, Xue L, Husak V, Ellinger J, Haudenschild CC, Greisler HP. Improving endothelial healing with novel chimeric mitogens. Am J Surg 2006; 192:589-93. [PMID: 17071189 DOI: 10.1016/j.amjsurg.2006.08.005] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2006] [Revised: 08/04/2006] [Accepted: 08/04/2006] [Indexed: 11/29/2022]
Abstract
BACKGROUND Chimeric proteins may be used to direct cell-specific activity. Heparin-binding growth-associated molecule (HBGAM) binds to cell receptors that are relatively more robust on endothelial cells, and it may confer endothelial cell selectivity to potent angiogens such as fibroblast growth factor-1 (FGF-1). METHODS By ligating fibroblast growth factor or its potent mutant, S130K, to HBGAM, we tested their effect on re-endothelialization after angioplasty injury by using a canine model. RESULTS Both HBGAM/S130K- and HBGAM/FGF-1-treated arteries had increased neointimal mitotic index and re-endothelialization rates at 30 days compared with control arteries without inducing a significant increase in the neointimal thickness or the ratio of neointimal to medial thickness between treatment and control groups. CONCLUSION HBGAM/S130K and HBGAM/FGF-1 facilitates endothelial healing without myointimal thickening after canine carotid artery balloon angioplasty injury. Application of these growth factors in fibrin glue may improve endothelialization clinically after angioplasty or endarterectomy.
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Affiliation(s)
- Luke Brewster
- Department of Surgery, Loyola University, 2160 South First Avenue, Maywood, IL 60153, USA
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Brewster L, Brey E, Greisler H. Cardiovascular gene delivery: The good road is awaiting. Adv Drug Deliv Rev 2006; 58:604-29. [PMID: 16769148 PMCID: PMC3337725 DOI: 10.1016/j.addr.2006.03.002] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2005] [Accepted: 03/24/2006] [Indexed: 01/13/2023]
Abstract
Atherosclerotic cardiovascular disease is a leading cause of death worldwide. Despite recent improvements in medical, operative, and endovascular treatments, the number of interventions performed annually continues to increase. Unfortunately, the durability of these interventions is limited acutely by thrombotic complications and later by myointimal hyperplasia followed by progression of atherosclerotic disease over time. Despite improving medical management of patients with atherosclerotic disease, these complications appear to be persisting. Cardiovascular gene therapy has the potential to make significant clinical inroads to limit these complications. This article will review the technical aspects of cardiovascular gene therapy; its application for promoting a functional endothelium, smooth muscle cell growth inhibition, therapeutic angiogenesis, tissue engineered vascular conduits, and discuss the current status of various applicable clinical trials.
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Affiliation(s)
- L.P. Brewster
- Department of Surgery, Loyola University Medical Center, Maywood, IL, 60153, USA
- Department of Cell Biology, Neurobiology, and Anatomy, Loyola University Medical Center, Maywood, IL, 60153, USA
| | - E.M. Brey
- Department of Surgery, Loyola University Medical Center, Maywood, IL, 60153, USA
- Department of Biomedical Engineering, Illinois Institute of Technology, Chicago, IL, 60616, USA
- Research and Surgical Services, Edward J. Hines Jr. V.A. Hospital, Hines, IL, 60141, USA
| | - H.P. Greisler
- Department of Surgery, Loyola University Medical Center, Maywood, IL, 60153, USA
- Department of Cell Biology, Neurobiology, and Anatomy, Loyola University Medical Center, Maywood, IL, 60153, USA
- Research and Surgical Services, Edward J. Hines Jr. V.A. Hospital, Hines, IL, 60141, USA
- Corresponding author. Loyola University Medical Center, Department of Surgery, 2160 South First Avenue, Maywood, IL, 60153, USA. Tel.: +1 708 216 8541; fax: +1 708 216 6300. (H.P. Greisler)
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Fibroblast Growth Factor-1 Therapy for Advanced Emphysema???A New Tissue Engineering Approach for Achieving Lung Volume Reduction. ACTA ACUST UNITED AC 2006. [DOI: 10.1097/00128594-200607000-00004] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Salvay DM, Shea LD. Inductive tissue engineering with protein and DNA-releasing scaffolds. MOLECULAR BIOSYSTEMS 2005; 2:36-48. [PMID: 16880921 PMCID: PMC2657198 DOI: 10.1039/b514174p] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Cellular differentiation, organization, proliferation and apoptosis are determined by a combination of an intrinsic genetic program, matrix/substrate interactions, and extracellular cues received from the local microenvironment. These molecular cues come in the form of soluble (e.g. cytokines) and insoluble (e.g. ECM proteins) factors, as well as signals from surrounding cells that can promote specific cellular processes leading to tissue formation or regeneration. Recent developments in the field of tissue engineering have employed biomaterials to present these cues, providing powerful tools to investigate the cellular processes involved in tissue development, or to devise therapeutic strategies based on cell replacement or tissue regeneration. These inductive scaffolds utilize natural and/or synthetic biomaterials fabricated into three-dimensional structures. This review summarizes the use of scaffolds in the dual role of structural support for cell growth and vehicle for controlled release of tissue inductive factors, or DNA encoding for these factors. The confluence of molecular and cell biology, materials science and engineering provides the tools to create controllable microenvironments that mimic natural developmental processes and direct tissue formation for experimental and therapeutic applications.
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Affiliation(s)
- David M. Salvay
- Department of Chemical and Biological Engineering, 2145 Sheridan Rd E156 Evanston, IL 60208-3120. E-mail: ; Fax: 847-491-3728; Tel: 847-491-7043
| | - Lonnie D. Shea
- Department of Chemical and Biological Engineering, 2145 Sheridan Rd E156 Evanston, IL 60208-3120. E-mail: ; Fax: 847-491-3728; Tel: 847-491-7043
- Department of Biomedical Engineering, Northwestern University, 2145 Sheridan Rd E156 Evanston, IL 60208-3120
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Brey EM, Uriel S, Greisler HP, McIntire LV. Therapeutic neovascularization: contributions from bioengineering. ACTA ACUST UNITED AC 2005; 11:567-84. [PMID: 15869435 DOI: 10.1089/ten.2005.11.567] [Citation(s) in RCA: 73] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
A number of pathological entities and surgical interventions could benefit from therapeutic stimulation of new blood vessel formation. Although strategies designed for promoting neovascularization have shown promise in preclinical models, translation to human application has met with limited success when angiogenesis is used as the single therapeutic mechanism. While clinical protocols continue to be optimized, a number of exciting new approaches are being developed. Bioengineering has played an important role in the progress of many of these innovative new strategies. In this review, we present a general outline of therapeutic neovascularization, with an emphasis on investigations using engineering principles to address this vexing clinical problem. In addition, we identify some limitations and suggest areas for future research.
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Affiliation(s)
- Eric M Brey
- Pritzker Institute of Biomedical Science and Engineering, Department of Biomedical Engineering, Illinois Institute of Technology, Chicago, 60616, USA.
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Brewster LP, Brey EM, Tassiopoulos AK, Xue L, Maddox E, Armistead D, Burgess WH, Greisler HP. Heparin-independent mitogenicity in an endothelial and smooth muscle cell chimeric growth factor (S130K-HBGAM). Am J Surg 2004; 188:575-9. [PMID: 15546573 DOI: 10.1016/j.amjsurg.2004.07.012] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2004] [Revised: 07/26/2004] [Indexed: 10/26/2022]
Abstract
BACKGROUND Through site-directed mutagenesis we have created a favorable fibroblast growth factor-1 (FGF-1) mutant (S130K) and linked it to a heparin-binding growth-associated molecule (HBGAM) to form the chimera S130K-HBGAM creating a heparin-independent, endothelial cell (EC)-specific mitogen. METHODS The proliferative responses of primary canine carotid artery smooth muscle cells (SMC) and jugular vein EC to FGF-1, S130K, or S130K-HBGAM, with and without heparin (5 U/mL), was quantitated by measuring tritiated thymidine uptake over 24 hours and expressing the results as percent of positive control (20% fetal bovine serum [FBS]) for group comparison. RESULTS Unlike FGF-1, both S130K and S130K-HBGAM are heparin-independent mitogens for EC and SMC. S130K-HBGAM was equivalent to FGF-1 with heparin at 6 nmol/L. S130K-HBGAM did not demonstrate relative EC specificity in this assay. CONCLUSIONS At higher concentrations, S130K-HBGAM is a potent, heparin-independent EC and SMC mitogen. Co-culture assays and in vivo delivery models may demonstrate EC specificity not identified in this single cell type proliferation assay.
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MESH Headings
- Analysis of Variance
- Animals
- Base Sequence
- Carotid Arteries/cytology
- Cell Proliferation/drug effects
- Cells, Cultured
- Dogs
- Endothelium, Vascular/cytology
- Endothelium, Vascular/drug effects
- Endothelium, Vascular/metabolism
- Fibroblast Growth Factor 1/genetics
- Fibroblast Growth Factor 1/metabolism
- Fibroblast Growth Factor 1/pharmacology
- Heparin/pharmacology
- Mitogens/pharmacology
- Models, Animal
- Molecular Sequence Data
- Muscle, Smooth, Vascular/cytology
- Muscle, Smooth, Vascular/drug effects
- Muscle, Smooth, Vascular/metabolism
- Myocytes, Smooth Muscle/drug effects
- Myocytes, Smooth Muscle/metabolism
- Point Mutation
- Polymerase Chain Reaction
- Probability
- Recombinant Fusion Proteins/genetics
- Recombinant Fusion Proteins/metabolism
- Recombinant Fusion Proteins/pharmacology
- Recombinant Proteins
- Sensitivity and Specificity
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Affiliation(s)
- Luke P Brewster
- Department of Surgery, Loyola University Medical Center, 2160 South First Ave., Maywood, IL 60153, USA
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Matsumoto T, Okazaki M, Inoue M, Yamaguchi S, Kusunose T, Toyonaga T, Hamada Y, Takahashi J. Hydroxyapatite particles as a controlled release carrier of protein. Biomaterials 2004; 25:3807-12. [PMID: 15020156 DOI: 10.1016/j.biomaterials.2003.10.081] [Citation(s) in RCA: 205] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2002] [Accepted: 10/10/2003] [Indexed: 11/23/2022]
Abstract
This study examines the possibility of using hydroxyapatite (HAp) particles as a controlled release carrier of protein. In order to achieve effective protein release from HAp particles, it is necessary to regulate the conjugated amount of protein on HAp and the resorption of HAp. HAp particles were synthesized at different temperatures (40 degrees C, 60 degrees C, 80 degrees C) in wet condition and the physico-chemical properties of synthesized HAp particles were examined. HAp particles synthesized at low temperatures showed low crystallinity, high solubility and large specific surface area. The useful growth factors for bone regeneration, such as BMP, bFGF and TGF-beta, are basic proteins, so cytochrome c (pI=10.2) was used as a model protein and the adsorptive property of protein on HAp particles was investigated. The protein adsorption on HAp particles changed depending on its specific surface area and the chart of protein adsorption on HAp particles showed a typical Langmuir curve. These findings suggest that the adsorbed amount of protein on HAp particles could be regulated by HAp synthesizing temperature and the concentrations of protein solution. The release kinetics of protein from the HAp particles that adsorbed the protein (HAp-pro) was also evaluated in different pH solutions (pH 4.0 and 7.0). The released protein gradually increased time dependently when HAp-pro were immersed in pH 4.0 solution, but the released protein was significantly smaller when HAp-pro were immersed in pH 7.0 solution. Moreover, the release rate of protein from HAp-pro differed in each HAp that was synthesized at different temperatures, suggesting that the release of protein from HAp-pro depended on HAp resorption. These results suggest that HAp particles synthesized at different temperature are useful as a controlled release carrier of protein.
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Affiliation(s)
- T Matsumoto
- Division of Biomaterials Science, Graduate School of Dentistry, Osaka University, 1-8 Yamadaoka, Suita, Osaka 565-0871, Japan.
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Abstract
BACKGROUND There is an increased need for alternative, synthetic, small-diameter vascular grafts due to a growing segment of the population who suffer from ischemic heart disease and lack suitable autologous vein grafts for use in coronary artery bypass grafting (CABG). We hypothesized that a cell-mediated extracellular matrix (ECM) modification of ePTFE would stimulate increased vascularization within the graft and thus promote lumenal endothelialization in a 1-mm rat abdomenal aortic implant model. METHODS AND RESULTS Expanded polytetrafluoroethylene (ePTFE) vascular grafts (1 mm i.d.) were modified on the ablumenal surface with ECM deposited by the HaCaT or II-4 cell lines and implanted intrapositionally into the descending aorta of rats. Five weeks after implantation, all samples were patent and examination of the grafts demonstrated that the ECM modified samples exhibited extensive ablumenal vascularization and tissue incorporation compared to nonmodified samples. Also, ECM modified grafts had a cellular lining, while the nonmodified grafts were void of a cellular lining except for a limited pannus ingrowth. CONCLUSION HaCaT and II-4 cell ECM modifications of ePTFE increase new blood vessel growth in association with the graft, and the II-4 cell modification results in formation of an endothelial monlayer on the lumenal surface of the graft.
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Affiliation(s)
- Kameha R Kidd
- Biomedical Engineering Program, University of Arizona, Tucson, AZ 85724, USA
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Affiliation(s)
- Howard P Greisler
- Loyola University Medical Center, 2160 South First Avenue, Maywood, IL 60153, USA.
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