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Canaud B, Stephens MP, Nikam M, Etter M, Collins A. Multitargeted interventions to reduce dialysis-induced systemic stress. Clin Kidney J 2021; 14:i72-i84. [PMID: 34987787 PMCID: PMC8711765 DOI: 10.1093/ckj/sfab192] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2021] [Indexed: 11/13/2022] Open
Abstract
Hemodialysis (HD) is a life-sustaining therapy as well as an intermittent and repetitive stress condition for the patient. In ridding the blood of unwanted substances and excess fluid from the blood, the extracorporeal procedure simultaneously induces persistent physiological changes that adversely affect several organs. Dialysis patients experience this systemic stress condition usually thrice weekly and sometimes more frequently depending on the treatment schedule. Dialysis-induced systemic stress results from multifactorial components that include treatment schedule (i.e. modality, treatment time), hemodynamic management (i.e. ultrafiltration, weight loss), intensity of solute fluxes, osmotic and electrolytic shifts and interaction of blood with components of the extracorporeal circuit. Intradialytic morbidity (i.e. hypovolemia, intradialytic hypotension, hypoxia) is the clinical expression of this systemic stress that may act as a disease modifier, resulting in multiorgan injury and long-term morbidity. Thus, while lifesaving, HD exposes the patient to several systemic stressors, both hemodynamic and non-hemodynamic in origin. In addition, a combination of cardiocirculatory stress, greatly conditioned by the switch from hypervolemia to hypovolemia, hypoxemia and electrolyte changes may create pro-arrhythmogenic conditions. Moreover, contact of blood with components of the extracorporeal circuit directly activate circulating cells (i.e. macrophages-monocytes or platelets) and protein systems (i.e. coagulation, complement, contact phase kallikrein-kinin system), leading to induction of pro-inflammatory cytokines and resulting in chronic low-grade inflammation, further contributing to poor outcomes. The multifactorial, repetitive HD-induced stress that globally reduces tissue perfusion and oxygenation could have deleterious long-term consequences on the functionality of vital organs such as heart, brain, liver and kidney. In this article, we summarize the multisystemic pathophysiological consequences of the main circulatory stress factors. Strategies to mitigate their effects to provide more cardioprotective and personalized dialytic therapies are proposed to reduce the systemic burden of HD.
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Affiliation(s)
- Bernard Canaud
- Montpellier University, Montpellier, France
- Global Medical Office, FMC Deutschland, Bad Homburg, Germany
| | - Melanie P Stephens
- MSL & Medical Strategies for Innovative Therapies, Fresenius Medical Care, Waltham, MA, USA
| | - Milind Nikam
- Global Medical Office, Fresenius Medical Care, Hong Kong
| | - Michael Etter
- Global Medical Office, Fresenius Medical Care, Hong Kong
| | - Allan Collins
- Global Medical Office, Fresenius Medical Care, Waltham, MA, USA
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2
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Xu Z, Feng Z, Guo L, Ye L, Tong Z, Geng X, Wang C, Jin X, Hui X, Gu Y. Biocompatibility evaluation of heparin-conjugated poly(ε-caprolactone) scaffolds in a rat subcutaneous implantation model. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2020; 31:76. [PMID: 32761269 DOI: 10.1007/s10856-020-06419-0] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/04/2020] [Accepted: 07/27/2020] [Indexed: 06/11/2023]
Abstract
Vascular grafts prepared from synthetic polymers have serious shortcomings that can be resolved by surface modification, such as by immobilizing heparin. In this study, the mechanical properties, biocompatibility, anticoagulation property, and water contact angle of two heparin-conjugated poly(ε-caprolactone) scaffolds (PCL-hexamethylendiamine-heparin, PCL-HMD-H. PCL-lysine-heparin, PCL-LYS-H) were compared to identify a preferred heparin conjugation method. An evaluation of the subcutaneous tissue biocompatibility of the scaffolds demonstrated that PCL-HMD-H had better endothelial cell proliferation than the PCL-LYS-H and was therefore a promising scaffold candidate for use in vascular tissue-engineering.
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Affiliation(s)
- Zeqin Xu
- Department of Vascular Surgery, Xuan Wu Hospital and Institute of Vascular Surgery, Capital Medical University, 100053, Beijing, China
| | - Zengguo Feng
- School of Materials Science & Engineering, Beijing Institute of Technology, 100081, Beijing, China
| | - Lianrui Guo
- Department of Vascular Surgery, Xuan Wu Hospital and Institute of Vascular Surgery, Capital Medical University, 100053, Beijing, China
| | - Lin Ye
- School of Materials Science & Engineering, Beijing Institute of Technology, 100081, Beijing, China
| | - Zhu Tong
- Department of Vascular Surgery, Xuan Wu Hospital and Institute of Vascular Surgery, Capital Medical University, 100053, Beijing, China
| | - Xue Geng
- School of Materials Science & Engineering, Beijing Institute of Technology, 100081, Beijing, China
| | - Cong Wang
- Department of Vascular Surgery, Xuan Wu Hospital and Institute of Vascular Surgery, Capital Medical University, 100053, Beijing, China
| | - Xin Jin
- School of Materials Science & Engineering, Beijing Institute of Technology, 100081, Beijing, China
| | - Xin Hui
- School of Materials Science & Engineering, Beijing Institute of Technology, 100081, Beijing, China
| | - Yongquan Gu
- Department of Vascular Surgery, Xuan Wu Hospital and Institute of Vascular Surgery, Capital Medical University, 100053, Beijing, China.
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3
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Fu X, Ning JP. Synthesis and biocompatibility of an argatroban-modified polysulfone membrane that directly inhibits thrombosis. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2018; 29:66. [PMID: 29744595 DOI: 10.1007/s10856-018-6054-4] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/03/2017] [Accepted: 04/04/2018] [Indexed: 06/08/2023]
Abstract
Anticoagulation therapy plays a vital role in the prevention of blood clot formation during hemodialysis and hemofiltration, especially for critical care patients. Here, we synthesized a novel argatroban (Arg)-modified polysulfone (PSf) membrane for anticoagulation. Arg was grafted onto the PSF membrane via chemical modification to increase membrane hydrophilicity. Protein adsorption, coagulation, as well as activation of platelets and complement systems were greatly reduced on the Arg-modified PSf membrane. Thus, the recalcification time and the activated partial thrombin time (APTT) were increased after the modification. In comparison with the pristine PSf membrane, the Arg-modified PSf membrane showed better hemocompatibility and anticoagulation properties, indicating its potential for applications in hemodialysis and hemofiltration. Modification of the PSf membrane has been investigated in attempts to further enhance the anticoagulation properties of the hemodialysis membranes, including a heparin-modified PSf membrane. However, heparin can inhibit plasma-free thrombin, and cause the occurrence of heparin-induced thrombocytopenia (HIT), which increases the risk of bleeding during dialysis in critical care patients. To address this problem, we modified PSf membrane with as a novel direct thrombin inhibitors, argatroban (Arg). It can reversibly bind to thrombin, inhibiting not only the plasma-free thrombin in the blood, but also clot-bound thrombin.
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Affiliation(s)
- Xiao Fu
- Department of Hematology, Xiangya Hospital, Central South University, Changsha, 410008, China
| | - Jian-Ping Ning
- Department of Nephropathy, Xiangya Hospital, Central South University, Changsha, 410008, China.
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4
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Huang Y, Peng G, Chen B, Yong P, Yao N, Yang L, Pirraco RP, Reis RL, Chen J. Preparation and characteristics of the sulfonated chitosan derivatives electrodeposited onto 316l stainless steel surface. JOURNAL OF BIOMATERIALS SCIENCE-POLYMER EDITION 2017; 29:236-256. [DOI: 10.1080/09205063.2017.1409047] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- Ye Huang
- Department of Chemical Engineering and Technology, School of Environmental and Chemical Engineering, Shanghai University, Shanghai, P. R. China
| | - Guangjia Peng
- Department of Chemical Engineering and Technology, School of Environmental and Chemical Engineering, Shanghai University, Shanghai, P. R. China
| | - Bin Chen
- Department of Chemical Engineering and Technology, School of Environmental and Chemical Engineering, Shanghai University, Shanghai, P. R. China
| | - Ping Yong
- Department of Chemical Engineering and Technology, School of Environmental and Chemical Engineering, Shanghai University, Shanghai, P. R. China
| | - Nan Yao
- Department of Chemical Engineering and Technology, School of Environmental and Chemical Engineering, Shanghai University, Shanghai, P. R. China
| | - Liming Yang
- Department of Chemical Engineering and Technology, School of Environmental and Chemical Engineering, Shanghai University, Shanghai, P. R. China
| | - Rogério P. Pirraco
- 3B’s Research Group – Biomaterials, Biodegradables and Biomimetics, University of Minho, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, Guimarães, Portugal
| | - Rui L. Reis
- ICVS/3B’s – PT Government Associate Laboratory, Guimarães, Portugal
| | - Jie Chen
- Department of Chemical Engineering and Technology, School of Environmental and Chemical Engineering, Shanghai University, Shanghai, P. R. China
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Hsieh YF, Sahagian K, Huang F, Xu K, Patel S, Li S. Comparison of plasma and chemical modifications of poly-L-lactide-co-caprolactone scaffolds for heparin conjugation. ACTA ACUST UNITED AC 2017; 12:065004. [PMID: 28980527 DOI: 10.1088/1748-605x/aa81aa] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Biodegradable polymers have potential as a scaffold material for making small diameter artery bypass grafts. To resist thrombosis, maintain biocompatibility and enhance the remodeling of the grafts, it is crucial to modify polymer scaffolds so that the grafts have antithrombogenic capacity and allow cell infiltration. In this study, two methods of aminolysis on electrospun poly-L-lactide-co-caprolactone (PLCL) microfiber vascular grafts are compared: plasma treatment method and Fmoc-PEG-diamine insertion method. Both methods successfully inserted amino groups on the polymer graft for heparin conjugation. However, plasma treatment resulted in significantly higher initial heparin density and higher heparin stability on PLCL microfibers than Fmoc-PEG-diamine treatment. In addition, mechanical testing demonstrated that the plasma treatment method maintained PLCL microfiber tensile strength after heparin conjugation. Fmoc-PEG-diamine insertion method compromised the mechanical property due to partial fiber melting and structure disruption. Subcutaneous implantation of the grafts in a rat model showed that heparin coating with both methods promoted cell infiltration. This study provides a rationale to optimize the biomolecule conjugation on electrospun PLCL scaffolds, and will have applications in tissue engineering vascular grafts and other tissues.
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Affiliation(s)
- Yu-Fang Hsieh
- Department of Bioengineering, University of California at Berkeley, CA, United States of America
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6
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Alginate/Poly(γ-glutamic Acid) Base Biocompatible Gel for Bone Tissue Engineering. BIOMED RESEARCH INTERNATIONAL 2015; 2015:185841. [PMID: 26504784 PMCID: PMC4609339 DOI: 10.1155/2015/185841] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/29/2015] [Revised: 08/05/2015] [Accepted: 08/06/2015] [Indexed: 11/23/2022]
Abstract
A technique for synthesizing biocompatible hydrogels by cross-linking calcium-form poly(γ-glutamic acid), alginate sodium, and Pluronic F-127 was created, in which alginate can be cross-linked by Ca2+ from Ca–γ-PGA directly and γ-PGA molecules introduced into the alginate matrix to provide pH sensitivity and hemostasis. Mechanical properties, swelling behavior, and blood compatibility were investigated for each hydrogel compared with alginate and for γ-PGA hydrogel with the sodium form only. Adding F-127 improves mechanical properties efficiently and influences the temperature-sensitive swelling of the hydrogels but also has a minor effect on pH-sensitive swelling and promotes anticoagulation. MG-63 cells were used to test biocompatibility. Gelation occurred gradually through change in the elastic modulus as the release of calcium ions increased over time and caused ionic cross-linking, which promotes the elasticity of gel. In addition, the growth of MG-63 cells in the gel reflected nontoxicity. These results showed that this biocompatible scaffold has potential for application in bone materials.
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7
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Ren X, Xu L, Xu J, Zhu P, Zuo L, Wei S. Immobilized heparin and its anti-coagulation effect on polysulfone membrane surface. JOURNAL OF BIOMATERIALS SCIENCE-POLYMER EDITION 2013; 24:1707-20. [PMID: 23705787 DOI: 10.1080/09205063.2013.792643] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Xiaoshuai Ren
- a Center for Biomedical Materials and Tissue Engineering, Academy for Advanced Interdisciplinary Studies , Peking University , Beijing , 100871 , P.R. China
| | - Ling Xu
- a Center for Biomedical Materials and Tissue Engineering, Academy for Advanced Interdisciplinary Studies , Peking University , Beijing , 100871 , P.R. China
- b Beijing Key Laboratory for Solid Waste Utilization and Management, College of Engineering , Peking University , Beijing , 100871 , P.R. China
| | - Jianxia Xu
- c Institute for Medical Devices Control , National Institutes for Food and Drug Control , Beijing , 100050 , P.R. China
| | - Peizhi Zhu
- a Center for Biomedical Materials and Tissue Engineering, Academy for Advanced Interdisciplinary Studies , Peking University , Beijing , 100871 , P.R. China
- d Department of Chemistry , University of Michigan , Ann Arbor , Michigan , 48109-1055 , USA
| | - Li Zuo
- e Renal Division, Department of Medicine, Peking University First Hospital, Institute of Nephrology, Key Laboratory of Renal Disease, Ministry of Health of China , Peking University , Beijing , 100034 , P.R. China
| | - Shicheng Wei
- a Center for Biomedical Materials and Tissue Engineering, Academy for Advanced Interdisciplinary Studies , Peking University , Beijing , 100871 , P.R. China
- f Department of Oral and Maxillofacial Surgery, School and Hospital of Stomatology , Peking University , Beijing , 100871 , P.R. China
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8
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Dizman C, Tasdelen MA, Yagci Y. Recent advances in the preparation of functionalized polysulfones. POLYM INT 2013. [DOI: 10.1002/pi.4525] [Citation(s) in RCA: 99] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Cemil Dizman
- Department of Chemistry; Istanbul Technical University; Maslak Istanbul 34469 Turkey
- Chemistry Institute; TUBITAK Marmara Research Center; Gebze Kocaeli 41470 Turkey
| | - Mehmet Atilla Tasdelen
- Department of Polymer Engineering, Faculty of Engineering; Yalova University; TR-77100 Yalova Turkey
| | - Yusuf Yagci
- Department of Chemistry; Istanbul Technical University; Maslak Istanbul 34469 Turkey
- Center of Excellence for Advanced Materials Research (CEAMR) and Chemistry Department, Faculty of Science; King Abdulaziz University; PO Box 80203 Jeddah 21589 Saudi Arabia
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9
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Mahlicli FY, Altinkaya SA. Surface modification of polysulfone based hemodialysis membranes with layer by layer self assembly of polyethyleneimine/alginate-heparin: a simple polyelectrolyte blend approach for heparin immobilization. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2013; 24:533-546. [PMID: 23128985 DOI: 10.1007/s10856-012-4804-2] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
This study intends to improve blood compatibility of polysulfone (PSF) membranes by generating a nonthrombogenic surface through heparin immobilization. To achieve this task, the support membrane prepared from a blend of PSF and sulfonated polysulfone (SPSF) was modified with layer by layer (LBL) deposition of polyethyleneimine (PEI) and alginate (ALG) and heparin blended with ALG was immobilized only on the outermost surface of the LBL assembly. The results have shown that the adsorption of human plasma proteins and platelet activation on the LBL modified membranes decreased significantly compared with the unmodified PSF and PSF-SPSF blend membranes. Furthermore, blending ALG with a small amount of heparin remarkably prolonged the APTT values of heparin free PEI/ALG coated membranes. It is envisaged that the use of a blend of HEP and ALG only in the terminating layer of the LBL assembly can be an economical and alternative modification technique to create nonthrombogenic surfaces.
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Affiliation(s)
- Filiz Yasar Mahlicli
- Department of Chemical Engineering, Izmir Institute of Technology, Gulbahçe Koyu, 35430, Urla, Izmir, Turkey
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10
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Huang T, Zhang M, Cheng L, Zhang L, Huang M, Xu Q, Chen H. A novel polysulfone-based affinity membrane with high hemocompatibility: preparation and endotoxin elimination performance. RSC Adv 2013. [DOI: 10.1039/c3ra43594f] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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11
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Gosau M, Bürgers R, Vollkommer T, Holzmann T, Prantl L. Effectiveness of antibacterial copper additives in silicone implants. J Biomater Appl 2012; 28:187-98. [DOI: 10.1177/0885328212441957] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Staphylococcus epidermidis plays a major role in capsular contractures of silicone breast implants. This in vitro study evaluates the antibacterial effect of copper on S. epidermidis in silicone implants. Specimens of a silicone material used for breast augmentation (Cu0) and specimens coated with different copper concentrations (Cu1, Cu2) were artificially aged. Surface roughness and surface free energy were assessed. The specimens were incubated in an S. epidermidis suspension. We assessed the quantification and the viability of adhering bacteria by live/dead cell labeling with fluorescence microscopy. Additionally, inhibition of bacterial growth was evaluated by agar diffusion, broth culture, and quantitative culture of surface bacteria. No significant differences in surface roughness and surface free energy were found between Cu0, Cu1 and Cu2. Aging did not change surface characteristics and the extent of bacterial adhesion. Fluorescence microscopy showed that the quantity of bacteria on Cu0 was significantly higher than that on Cu1 and Cu2. The ratio of dead to total adhering bacteria was significantly lower on Cu0 than on Cu1 and Cu2, and tended to be higher for Cu2 than for Cu1. Quantitative culture showed equal trends. Copper additives seem to have anti-adherence and bactericidal effects on S. epidermidis in vitro.
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Affiliation(s)
- Martin Gosau
- Department of Cranio-Maxillo-Facial Surgery, University Medical Center Regensburg, Germany
| | - Ralf Bürgers
- Department of Prosthetic Dentistry, University Medical Center Regensburg, Germany
| | - Tobias Vollkommer
- Department of Cranio-Maxillo-Facial Surgery, University Medical Center Regensburg, Germany
| | - Thomas Holzmann
- Institute for Medical Microbiology and Hygiene, University Medical Center Regensburg, Germany
| | - Lukas Prantl
- Department of Trauma and Plastic Surgery, University Medical Center Regensburg, Germany
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12
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Guillame-Gentil O, Semenov O, Roca AS, Groth T, Zahn R, Vörös J, Zenobi-Wong M. Engineering the extracellular environment: Strategies for building 2D and 3D cellular structures. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2010; 22:5443-62. [PMID: 20842659 DOI: 10.1002/adma.201001747] [Citation(s) in RCA: 119] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/11/2010] [Indexed: 05/22/2023]
Abstract
Cell fate is regulated by extracellular environmental signals. Receptor specific interaction of the cell with proteins, glycans, soluble factors as well as neighboring cells can steer cells towards proliferation, differentiation, apoptosis or migration. In this review, approaches to build cellular structures by engineering aspects of the extracellular environment are described. These methods include non-specific modifications to control the wettability and stiffness of surfaces using self-assembled monolayers (SAMs) and polyelectrolyte multilayers (PEMs) as well as methods where the temporal activation and spatial distribution of adhesion ligands is controlled. Building on these techniques, construction of two-dimensional cell sheets using temperature sensitive polymers or electrochemical dissolution is described together with current applications of these grafts in the clinical arena. Finally, methods to pattern cells in three-dimensions as well as to functionalize the 3D environment with biologic motifs take us one step closer to being able to engineer multicellular tissues and organs.
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13
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Chien HW, Wu SP, Kuo WH, Wang MJ, Lee C, Lai JY, Tsai WB. Modulation of hemocompatibility of polysulfone by polyelectrolyte multilayer films. Colloids Surf B Biointerfaces 2010; 77:270-8. [DOI: 10.1016/j.colsurfb.2010.02.009] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2009] [Revised: 01/30/2010] [Accepted: 02/03/2010] [Indexed: 11/17/2022]
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14
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The biocompatibility of self-assembled brush polymers bearing glycine derivatives. Biomaterials 2010; 31:3816-26. [DOI: 10.1016/j.biomaterials.2010.01.130] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2009] [Accepted: 01/20/2010] [Indexed: 11/17/2022]
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15
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Gosau M, Prantl L, Feldmann M, Kokott A, Hahnel S, Burgers R. The effects of copper additives on the quantity and cell viability of adherent Staphylococcus epidermidis in silicone implants. BIOFOULING 2010; 26:359-365. [PMID: 20140797 DOI: 10.1080/08927011003629300] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
This in vitro study evaluated the antibacterial effect of copper additives in silicone implants. Specimens of a standard silicone material used in breast augmentation and modified copper-loaded silicone specimens were prepared and incubated in a Staphylococcus epidermidis suspension (2 h, 37 degrees C). After the quantification of adhering staphylococci using a biofluorescence assay (Resazurin), the viability of the adhering bacterial cells was quantified by live or dead cell labeling in combination with fluorescence microscopy. In the Resazurin fluorometric quantification, a higher amount of adhering S. epidermidis cells was detected on pure silicone (4612 [2319/7540] relative fluorescence units [rfu]) than on silicone with copper additives (2701 [2158/4153] rfu). Additionally, a significantly higher amount of adhering bacterial cells (5.07% [2.03%/8.93%]) was found for pure silicone than for silicone with copper additives (1.72% [1.26%/2.32%]); (p < 0.001). Calculations from live or dead staining showed that the percentage of dead S. epidermidis cells adhered on pure silicone (52.1%) was significantly lower than on silicone with copper additives (79.7%); (p < 0.001). In vitro, silicone material with copper additives showed antibacterial effects against S. epidermidis. Copper-loaded silicone may prevent bacterial colonization, resulting in lower infection rates of silicone implants.
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Affiliation(s)
- Martin Gosau
- Department of Cranio-Maxillo-Facial Surgery, University Medical Center, Regensburg, Germany.
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16
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Photo-initiated grafting of gelatin/N-maleic acyl-chitosan to enhance endothelial cell adhesion, proliferation and function on PLA surface. Acta Biomater 2009; 5:2033-44. [PMID: 19299215 DOI: 10.1016/j.actbio.2009.02.016] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2008] [Revised: 12/31/2008] [Accepted: 02/10/2009] [Indexed: 02/01/2023]
Abstract
Vascular graft surface properties significantly affect adhesion, growth and function of endothelial cells (ECs). The bulk degradation property of poly(lactic acid) (PLA) makes it possible for it to be replaced by cellular materials and PLA is desirable as a scaffold material for vascular grafts. However, PLA has an unfavorable surface property for EC adhesion and proliferation due to the lack of a selective cell adhesion motif. Photo-initiated surface-grafting polymerization is a promising method for immobilizing certain biomacromolecules on material surfaces without compromising bulk properties. N-Maleic acyl-chitosan (NMCS) is a novel biocompatible amphiphilic derivative of chitosan with double bonds and can be initiated by ultraviolet light. In this study, gelatin was complexed with NMCS via hydrophobic interaction, and gel/NMCS complex thus formed was then grafted on the PLA surface to improve EC biocompatibility. X-ray photoelectron and Fourier transform infrared spectroscopy, and water contact angle measurement confirmed immobilization of the gel/NMCS complex on PLA surface. Moreover, the gel/NMCS modified PLA enhanced human umbilical vein endothelial cell (HUVEC) spreading and flattening, and promoted the expression of more structured CD31 and vWF compared to unmodified PLA film. Compared to the unmodified PLA surface, the HUVECs on the modified PLA surface had elevated uptake of acetylated low-density lipoprotein, and maintained the ability to modulate metabolic activity upon exposure to shear stress at 5dyncm(-2) by up-regulating nitric oxide and prostacyclin production. Cell retention was 1.6 times higher on the gel/NMCS-PLA surface, demonstrating its improved potential for hemocompatibility. These results indicate that photo-initiated surface-grafting of the biomimetic gel/NMCS complex is an effective method to modify material surfaces as vascular grafts.
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17
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Huang MH, Yang MC. Swelling and biocompatibility of sodium alginate/poly(γ-glutamic acid) hydrogels. POLYM ADVAN TECHNOL 2009. [DOI: 10.1002/pat.1466] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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18
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Yu DG, Lin WC, Yang MC. Surface Modification of Poly(l-lactic acid) Membrane via Layer-by-Layer Assembly of Silver Nanoparticle-Embedded Polyelectrolyte Multilayer. Bioconjug Chem 2007; 18:1521-9. [PMID: 17688319 DOI: 10.1021/bc060098s] [Citation(s) in RCA: 91] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The improvement of hydrophilicity, antibacterial activity, hemocompatibility, and cytocompatibility of poly(L-lactic acid) (PLLA) membrane was developed via polyelectrolyte multilayer (PEM) immobilization. Colloidal silver nanoparticles were prepared by using dextran sulfate (DS) as a stabilizer to precede chemical reduction by dextrose. The polysaccharide PEMs, including chitosan (CH) and dextran sulfate (DS)-stabilized silver nanosized colloid (DSS), were successfully deposited on the aminolyzed PLLA membrane in a layer-by-layer (LBL) self-assembly manner. The obtained results showed that the contact angle of PLLA membranes decreased with PEMs grafting layers and reached a steady value after four bilayers of coating, hence suggesting that full coverage was achieved. The PLLA-PEM membranes with DSS as the outermost layer could resist platelet adhesion and human plasma fibrinogen (HPF) adsorption, while prolonging the blood coagulation time. The PLLA-PEM membranes could possess antibacterial activity against Methicilin-resistant Staphylococus aureus (MRSA). In addition, the proliferation and viability of human endothelial cells (ECs) on PLLA-PEM membranes could be significantly improved. Overall results demonstrated that such a fast, easy processing and shape-independent method for an antithrombogenic coating can be used for applications in hemodialysis devices.
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Affiliation(s)
- Da-Guang Yu
- Department of Textile Science, Nanya Institute of Technology, Chung-Li, Tao-Yuan, Taiwan.
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19
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Yu DG, Jou CH, Lin WC, Yang MC. Surface modification of poly(tetramethylene adipate-co-terephthalate) membrane via layer-by-layer assembly of chitosan and dextran sulfate polyelectrolyte multiplayer. Colloids Surf B Biointerfaces 2007; 54:222-9. [PMID: 17174535 DOI: 10.1016/j.colsurfb.2006.10.026] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2006] [Revised: 09/29/2006] [Accepted: 10/21/2006] [Indexed: 10/24/2022]
Abstract
The improvement of hydrophilicity and hemocompatibility of poly(tetramethylene adipate-co-terephthalate) (PTAT) membrane was developed via polyelectrolyte multilayers (PEMs) immobilization. The polysaccharide PEMs included chitosan (CS, as a positive-charged and antibacterial agent) and dextran sulfate (DS, as a negative-charged and anti-adhesive agent) were successfully prepared using the aminolyzed PTAT membrane in a layer-by-layer (LBL) self-assembly manner. The obtained results showed that the contact angle of as-modified PTAT membranes reached to the steady value after four bilayers of coating, hence suggesting that the full coverage was achieved. It could be found that the PTAT-PEMs membranes with DS as the outmost layer could resist the platelet adhesion and human plasma fibrinogen (HPF) adsorption, thereby prolonging effectively the blood coagulation times. According to L929 fibroblast cell growth inhibition index, the as-prepared PTAT membranes exhibited non-cytotoxic. Overall results demonstrated that such an easy, valid and shape-independent processing should be potential for surface modification of PTAT membrane in the application of hemodialysis devices.
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Affiliation(s)
- Da-Guang Yu
- Department of Textile Science, Nanya Institute of Technology, Chung-Li, Tao-Yuan, Taiwan.
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Yu DG, Lin WC, Lin CH, Yeh YH, Yang MC. Construction of antithrombogenic polyelectrolyte multilayer on thermoplastic polyurethane via layer-by-layer self-assembly technique. J Biomed Mater Res B Appl Biomater 2007; 83:105-13. [PMID: 17318824 DOI: 10.1002/jbm.b.30772] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
The improvement of hydrophilicity and hemocompatibility of thermoplastic polyurethane (TPU) film was developed using surface modification of polyelectrolyte multilayers (PEMs) deposition. The polysaccharide PEMs included chitosan (CS, as a positive-charged agent) and dextran sulfate (DS, as a negative-charged and an antiadhesive agent) that were successfully prepared on the aminolyzed TPU film in a layer-by-layer (LBL) self-assembly manner. X-ray photoelectron spectroscopy (XPS), field-emission scanning electronic microscopy (FE-SEM), and atomic force microscopy (AFM) data will verify the progressive buildup of the PEMs film. The obtained results showed that the contact angle and Zeta-potential reached the steady value after four bilayers of coating, hence proving that the full coverage of coating with PEM layers was achieved. It could be found that the PEMs-deposited TPU films with DS as the outmost layer could resist the platelet adhesion and human plasma fibrinogen (HPF) adsorption, thereby prolonging effectively the blood coagulation times. Besides, the results of growth inhibition index (GI) of L929 fibroblast proliferation suggested that the as-fabricated TPU films were noncytotoxic. Overall results demonstrated that such an easy, valid, shape-independent, and noncytotoxic processing should be potential for the ion of TPU substrate in the application of hemodialysis or cardiovascular devices.
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Affiliation(s)
- Da-Guang Yu
- Department of Textile Science, Nanya Institute of Technology, Chung-Li, Tao-Yuan, Taiwan.
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Lin WC, Tseng CH, Yang MC. In-Vitro Hemocompatibility Evaluation of a Thermoplastic Polyurethane Membrane with Surface-Immobilized Water-Soluble Chitosan and Heparin. Macromol Biosci 2005; 5:1013-21. [PMID: 16211549 DOI: 10.1002/mabi.200500077] [Citation(s) in RCA: 61] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
The surface of a thermoplastic polyurethane (TPU) membrane was treated with low temperature plasma (LTP) and was then grafted with poly(acrylic acid) (PAA), followed by the grafting of water-soluble chitosan (WSC) and heparin (HEP). The surface was characterized with static contact-angle and X-ray photoelectron spectroscopy (XPS). The results showed that the surface densities of peroxides and PAA reached a maximum when treated with LTP for 90 s. A higher pH of the reacting solution led to higher graft densities of WSC and HEP. After WSC and HEP grafting, the hydrophilicity of the TPU membrane was increased. The adsorption of proteins on HEP-grafted TPU membranes was effectively curtailed. In addition, HEP grafting also reduced platelet adhesion, elevated thrombin inactivation, and prolonged the blood coagulation time. According to the L929 fibroblast cell growth inhibition index, the HEP-grafted TPU membranes exhibited non-cytotoxicity. Overall results demonstrated that the HEP immobilization could not only improve the hydrophilicity but also the hemocompatibility of the TPU membrane, while maintaining the ascendant biocompatibility.
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Affiliation(s)
- Wen-Ching Lin
- Department of Polymer Engineering, National Taiwan University of Science and Technology, Taipei, Taiwan, 106, ROC
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Lin WC, Yu DG, Yang MC. Blood compatibility of thermoplastic polyurethane membrane immobilized with water-soluble chitosan/dextran sulfate. Colloids Surf B Biointerfaces 2005; 44:82-92. [PMID: 16023839 DOI: 10.1016/j.colsurfb.2005.05.015] [Citation(s) in RCA: 62] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2004] [Revised: 05/30/2005] [Accepted: 05/30/2005] [Indexed: 11/15/2022]
Abstract
Water-soluble chitosan (WSC)/dextran sulfate (DS) was immobilized onto the surface of thermoplastic polyurethane (TPU) membrane after ozone-induced graft polymerization of poly(acrylic acid) (PAA). The surface was characterized with contact angle measurement and X-ray photoelectron spectroscopy (XPS). The adsorption of human plasma fibrinogen (HPF) followed the Langmuir adsorption isotherm. The results showed that the surface density of peroxides generated and poly(acrylic acid) (PAA) grafted reached the maximum value at 20 min of ozone treatment. It was found that the WSC- and DS-immobilized amount increased with pH and the molecular weight of WSC. The membrane/water interfacial free energy increased with PAA-grafting and WSC/DS-immobilization, indicating the increasing wettability of TPU membrane. The adsorption of HPF on TPU-WSC/DS membranes could be effectively curtailed and exhibited unfavorable adsorption. Moreover, WSC/DS immobilization could effectively reduce platelet adhesion and prolong the blood coagulation time, thereby membrane improving blood compatibility of TPU membrane. In addition, the in vitro cytotoxicity test of PEC modification was non-cytotoxic according to much low growth inhibition of L929 fibroblasts. Furthermore, TPU-WSC/DS membranes exhibited higher cell viability than native TPU membrane.
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Affiliation(s)
- Wen-Ching Lin
- Department of Polymer Engineering, National Taiwan University of Science and Technology, Taipei, Taiwan.
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Lin WC, Liu TY, Yang MC. Hemocompatibility of polyacrylonitrile dialysis membrane immobilized with chitosan and heparin conjugate. Biomaterials 2004; 25:1947-57. [PMID: 14738859 DOI: 10.1016/j.biomaterials.2003.08.027] [Citation(s) in RCA: 199] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Chitosan (CS)/heparin (HEP) polyelectrolyte complex (PEC) was covalently immobilized onto the surface of polyacrylonitrile (PAN) membrane. The effect of surface modification on the protein adsorption and platelet adhesion, metabolites permeation and anticoagulation activity of the resulting membrane was investigated. Surface characterization such as water contact angle, and X-ray photoelectron spectroscope were performed. The immobilization of PEC caused the water contact angle to reduce, thereby indicating the increase in the hydrophilicity. Protein adsorption, platelet adhesion, and thrombus formation were all reduced by the immobilization of HEP. Anticoagulant activity was evaluated with activated partial thrombin time (APTT), prothrombin time (PT), fibrinogen time, and thrombin time (TT). The results revealed that PEC-immobilizing membrane can improve antithrombogenicity of PAN membrane. In addition, the PEC-immobilized membranes can suppress the proliferation of Pseudomonas aeruginosa. In vitro cytotoxicity test showed leachable substance released was below cytotoxic level. The pure water permeability results show little variation due to PEC-immobilization. Thus PEC-immobilization can endow the PAN membrane hemocompatibility and antibacterial activity while retaining the original permeability.
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Affiliation(s)
- Wen-Ching Lin
- Department of Polymer Engineering, National Taiwan University of Science and Technology, 106, ROC, Taipei, Taiwan
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Yang MC, Lin WC. Protein adsorption and platelet adhesion of polysulfone membrane immobilized with chitosan and heparin conjugate. POLYM ADVAN TECHNOL 2003. [DOI: 10.1002/pat.337] [Citation(s) in RCA: 61] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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