1
|
Safina I, Childress LT, Myneni SR, Vang KB, Biris AS. Cell-Biomaterial Constructs for Wound Healing and Skin Regeneration. Drug Metab Rev 2022; 54:63-94. [PMID: 35129408 DOI: 10.1080/03602532.2021.2025387] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Over the years, conventional skin grafts, such as full-thickness, split-thickness, and pre-sterilized grafts from human or animal sources, have been at the forefront of skin wound care. However, these conventional grafts are associated with major challenges, including supply shortage, rejection by the immune system, and disease transmission following transplantation. Due to recent progress in nanotechnology and material sciences, advanced artificial skin grafts-based on the fundamental concepts of tissue engineering-are quickly evolving for wound healing and regeneration applications, mainly because they can be uniquely tailored to meet the requirements of specific injuries. Despite tremendous progress in tissue engineering, many challenges and uncertainties still face skin grafts in vivo, such as how to effectively coordinate the interaction between engineered biomaterials and the immune system to prevent graft rejection. Furthermore, in-depth studies on skin regeneration at the molecular level are lacking; as a consequence, the development of novel biomaterial-based systems that interact with the skin at the core level has also been slow. This review will discuss 1) the biological aspects of wound healing and skin regeneration, 2) important characteristics and functions of biomaterials for skin regeneration applications, and 3) synthesis and applications of common biomaterials for skin regeneration. Finally, the current challenges and future directions of biomaterial-based skin regeneration will be addressed.
Collapse
Affiliation(s)
- Ingrid Safina
- Center for Integrative Nanotechnology Sciences, University of Arkansas at Little Rock, 2801 S. University Avenue, Little Rock, AR 72204 USA
| | - Luke T Childress
- Center for Integrative Nanotechnology Sciences, University of Arkansas at Little Rock, 2801 S. University Avenue, Little Rock, AR 72204 USA
| | - Srinivas R Myneni
- Department of Periodontology, Stony Brook University, Stony Brook, NY 11794 USA
| | - Kieng Bao Vang
- Center for Integrative Nanotechnology Sciences, University of Arkansas at Little Rock, 2801 S. University Avenue, Little Rock, AR 72204 USA
| | - Alexandru S Biris
- Center for Integrative Nanotechnology Sciences, University of Arkansas at Little Rock, 2801 S. University Avenue, Little Rock, AR 72204 USA
| |
Collapse
|
2
|
Degradable Poly(ethylene oxide)-Like Plasma Polymer Films Used for the Controlled Release of Nisin. Polymers (Basel) 2020; 12:polym12061263. [PMID: 32492821 PMCID: PMC7362230 DOI: 10.3390/polym12061263] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2020] [Revised: 05/27/2020] [Accepted: 05/30/2020] [Indexed: 12/22/2022] Open
Abstract
Poly(ethylene oxide) (PEO)-like thin films were successfully prepared by plasma-assisted vapor thermal deposition (PAVTD). PEO powders with a molar weight (Mw) between 1500 g/mol and 600,000 g/mol were used as bulk precursors. The effect of Mw on the structural and surface properties was analyzed for PEO films prepared at a lower plasma power. Fourier transform (FTIR-ATR) spectroscopy showed that the molecular structure was well preserved regardless of the Mw of the precursors. The stronger impact of the process conditions (the presence/absence of plasma) was proved. Molecular weight polydispersity, as well as wettability, increased in the samples prepared at 5 W. The influence of deposition plasma power (0–30 W) on solubility and permeation properties was evaluated for a bulk precursor of Mw 1500 g/mol. The rate of thickness loss after immersion in water was found to be tunable in this way, with the films prepared at the highest plasma power showing higher stability. The effect of plasma power deposition conditions was also shown during the permeability study. Prepared PEO films were used as a cover, and permeation layers for biologically active nisin molecule and a controlled release of this bacteriocin into water was achieved.
Collapse
|
3
|
Teixeira AG, Kleinman A, Agarwal R, Tam NW, Wang J, Frampton JP. Confinement of Suspension-Cultured Cells in Polyethylene Glycol/Polyethylene Oxide-Albumin Aqueous Two-Phase Systems. Front Chem 2019; 7:441. [PMID: 31275925 PMCID: PMC6591268 DOI: 10.3389/fchem.2019.00441] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2018] [Accepted: 05/28/2019] [Indexed: 11/13/2022] Open
Abstract
Aqueous two-phase systems (ATPSs) have numerous applications in separation science, and more recently, in bioassays enabled by the solution micropatterning of cells. The most frequently used ATPS in these applications is the polyethylene glycol (PEG)-dextran (Dex) system, as the polymers that form this ATPS have been extensively characterized in terms of their physicochemical properties. However, in addition to this well-known system, there exist many other ATPSs with properties that may be exploited to improve upon the PEG-dextran system for specific applications. One of these underexplored systems is the ATPS formed from PEG/polyethylene oxide (PEO) and albumin. In this article, we characterize the phase separation of PEG (35 kDa) and polyethylene oxide (PEO) (200, 900, and 4,000 kDa) with bovine serum albumin (BSA). We describe the microscopic emulsion behavior of these systems in the presence of NaCl and compounds (NaHCO3, NaH2PO4, and HEPES) commonly used in buffer solutions and cell culture media. We further demonstrate that PEG- and PEO-albumin systems can be used in place of the PEG-dextran system for confinement of suspension-cultured cells (Jurkat T cells and RPMI-8226 B cells). Cell viability and morphology are examined for various polymer formulations relative to the commonly used PEG 35 kDa-Dex 500 kDa system and polymer-free cell culture medium. In addition, we examine cell activation for various phase-separating medium components by measuring IL-2 and IL-6 secretion. We demonstrate that we can confine immune cells and cytokines in the PEG-BSA system, and that this system can be employed to screen immune responses by enzyme-linked immunospot (ELISpot) assay. This new system represents a promising ATPS formulation for applications where low levels of baseline cell activation are required, for instance, when culturing immune cells.
Collapse
Affiliation(s)
- Alyne G. Teixeira
- School of Biomedical Engineering, Dalhousie University, Halifax, NS, Canada
| | | | - Rishima Agarwal
- School of Biomedical Engineering, Dalhousie University, Halifax, NS, Canada
| | - Nicky W. Tam
- School of Biomedical Engineering, Dalhousie University, Halifax, NS, Canada
| | - Jun Wang
- Department of Microbiology and Immunology, Dalhousie University, Halifax, NS, Canada
- Canadian Center for Vaccinology, IWK Health Centre, Halifax, NS, Canada
| | - John P. Frampton
- School of Biomedical Engineering, Dalhousie University, Halifax, NS, Canada
| |
Collapse
|
4
|
Liu Y, Munisso MC, Mahara A, Kambe Y, Fukazawa K, Ishihara K, Yamaoka T. A surface graft polymerization process on chemically stable medical ePTFE for suppressing platelet adhesion and activation. Biomater Sci 2018; 6:1908-1915. [PMID: 29877532 DOI: 10.1039/c8bm00364e] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
An effective surface grafting method for chemically inert and elaborately porous medical expanded-polytetrafluoroethylene (ePTFE) was developed. Although surface graft polymerization onto basic polymeric biomaterials has been widely studied, successful modification of the ePTFE surface has been lacking due to its high chemical resistance. Herein, we succeeded in surface graft polymerization onto ePTFE through glycidyl methacrylate (GMA) as a bridge linkage following argon (Ar) plasma treatment. The epoxy group of GMA was expected to react with the peroxide groups produced on ePTFE by Ar plasma exposure, and its methacrylic groups can copolymerize with various monomers. In the present study, we selected 2-methacryloyloxyethyl phosphorylcholine (MPC) as a model monomer and the blood compatibility of modified ePTFE was evaluated. Two sequences of surface grafting were compared. In a two-step graft polymerization, GMA was first immobilized onto Ar plasma treated ePTFE, and then MPC was polymerized. In a one-step graft copolymerization, MPC and GMA were mixed and copolymerized simultaneously onto Ar plasma treated ePTFE, resulting in a poly(MPC-co-GMA) (PMG) graft surface. The roughness of the node-and-fibril structure of ePTFE was reduced by the uniform polymer layer, and the modified ePTFE had a good hydrophilic nature even after being stored in an aqueous environment for 30 days. The indispensable GMA in graft polymerization improved the surface grafting on ePTFE. The one-step and two-step graft polymerization methods could decrease the number of adhered platelets, and almost inhibit platelet activation. We concluded that graft polymerization with the GMA linker provides a novel strategy to modify the chemically inert ePTFE surfaces for functionalizing as new medical devices.
Collapse
Affiliation(s)
- Yihua Liu
- Department of Biomedical Engineering, National Cerebral and Cardiovascular Center, 5-7-1 Fujishirodai, Suita, Osaka 565-8565, Japan.
| | | | | | | | | | | | | |
Collapse
|
5
|
Duo X, Li Q, Wang J, Lv J, Hao X, Feng Y, Ren X, Shi C, Zhang W. Core/Shell Gene Carriers with Different Lengths of PLGA Chains to Transfect Endothelial Cells. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:13315-13325. [PMID: 29100464 DOI: 10.1021/acs.langmuir.7b02934] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
In order to improve the transfection efficiency and reduce the cytotoxicity of gene carriers, many strategies have been used to develop novel gene carriers. In this study, five complex micelles (MSP(2 k), MSP(4 k), MSP(6 k), MSP(8 k), and MSP(10 k)) were prepared from methoxy-poly(ethylene glycol)-b-poly(d,l-lactide-co-glycolide) (mPEG-b-PLGA) and sorbitol-poly(d,l-lactide-co-glycolide)-graft-PEI (sorbitol-PLGA-g-PEI, where the designed molecular weights of PLGA chains were 2 kDa, 4 kDa, 6 kDa, 8 kDa, and 10 kDa, respectively) copolymers by a self-assembly method, and the mass ratio of mPEG-b-PLGA to sorbitol-PLGA-g-PEI was 1/3. These complex micelles and their gene complexes had appropriate sizes and zeta potentials, and pEGFP-ZNF580 (pDNA) could be efficiently internalized into EA.hy926 cells by their gene complexes (MSP(2 k)/pDNA, MSP(4 k)/pDNA, MSP(6 k)/pDNA, MSP(8 k)/pDNA, and MSP(10 k)/pDNA). The MTT assay results demonstrated that the gene complexes had low cytotoxicity in vitro. When the hydrophobic PLGA chain increased above 6 kDa, the gene complexes showed higher performance than that prepared from short hydrophobic chains. Moreover, the relative ZNF580 protein expression levels in MSP(6 k)/pDNA, MSP(8 k)/pDNA, and MSP(10 k)/pDNA) groups were 79.6%, 71.2%, and 73%, respectively. These gene complexes could promote the transfection of endothelial cells, while providing important information and insight for the design of new and effective gene carriers to promote the proliferation and migration of endothelial cells.
Collapse
Affiliation(s)
- Xinghong Duo
- School of Chemical Engineering and Technology, Tianjin University , Yaguan Road 135, Tianjin 300350, China
- School of Chemistry and Chemical Engineering, Qinghai University for Nationalities , Bayi middle Road 3, Xining, Qinghai 810007, China
- Collaborative Innovation Center of Chemical Science and Chemical Engineering (Tianjin) , Weijin Road 92, Tianjin 300072, China
| | - Qian Li
- School of Chemical Engineering and Technology, Tianjin University , Yaguan Road 135, Tianjin 300350, China
- Collaborative Innovation Center of Chemical Science and Chemical Engineering (Tianjin) , Weijin Road 92, Tianjin 300072, China
| | - Jun Wang
- School of Chemical Engineering and Technology, Tianjin University , Yaguan Road 135, Tianjin 300350, China
- Collaborative Innovation Center of Chemical Science and Chemical Engineering (Tianjin) , Weijin Road 92, Tianjin 300072, China
| | - Juan Lv
- School of Chemical Engineering and Technology, Tianjin University , Yaguan Road 135, Tianjin 300350, China
- Collaborative Innovation Center of Chemical Science and Chemical Engineering (Tianjin) , Weijin Road 92, Tianjin 300072, China
| | - Xuefang Hao
- School of Chemical Engineering and Technology, Tianjin University , Yaguan Road 135, Tianjin 300350, China
- Collaborative Innovation Center of Chemical Science and Chemical Engineering (Tianjin) , Weijin Road 92, Tianjin 300072, China
| | - Yakai Feng
- School of Chemical Engineering and Technology, Tianjin University , Yaguan Road 135, Tianjin 300350, China
- Collaborative Innovation Center of Chemical Science and Chemical Engineering (Tianjin) , Weijin Road 92, Tianjin 300072, China
- Joint Laboratory for Biomaterials and Regenerative Medicine, Tianjin University-Helmholtz-Zentrum Geesthacht , Yaguan Road 135, Tianjin 300350, China
- Key Laboratory of Systems Bioengineering of Ministry of Education, Tianjin University , Yaguan Road 135, Tianjin 300350, China
| | - Xiangkui Ren
- School of Chemical Engineering and Technology, Tianjin University , Yaguan Road 135, Tianjin 300350, China
| | - Changcan Shi
- Wenzhou Institute of Biomaterials and Engineering, CNITECH, CAS , Wenzhou, Zhejiang 325011, China
- Institute of Biomaterials and Engineering, Wenzhou Medical University , Wenzhou, Zhejiang 325011, China
| | - Wencheng Zhang
- Department of Physiology and Pathophysiology, Logistics University of Chinese People's Armed Police Force , Tianjin 300162, China
| |
Collapse
|
6
|
Pham MH, Barz DP. Bonding Nafion ® with polydimethysiloxane: A versatile approach towards ion-exchange membrane microfluidic devices. J Memb Sci 2017. [DOI: 10.1016/j.memsci.2017.05.020] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
|
7
|
Yan Y, Yang Q, Wang J, Jin H, Wang J, Yang H, Zhou Z, Tian Q, Yang S. Heteropoly blue doped polymer nanoparticles: an efficient theranostic agent for targeted photoacoustic imaging and near-infrared photothermal therapy in vivo. J Mater Chem B 2017; 5:382-387. [DOI: 10.1039/c6tb02652d] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We report a two-step process to construct heteropoly blue (HPB) doped polymer nanoparticles with efficient near-infrared (NIR) light absorption and photothermal conversion efficiency of ∼23%.
Collapse
Affiliation(s)
- Yuping Yan
- The Key Laboratory of Resource Chemistry of Ministry of Education
- Shanghai Key Laboratory of Rare Earth Functional Materials, and Shanghai Municipal Education Committee Key Laboratory of Molecular Imaging Probes and Sensors
- Shanghai Normal University
- Shanghai 200234
- China
| | - Qi Yang
- The Key Laboratory of Resource Chemistry of Ministry of Education
- Shanghai Key Laboratory of Rare Earth Functional Materials, and Shanghai Municipal Education Committee Key Laboratory of Molecular Imaging Probes and Sensors
- Shanghai Normal University
- Shanghai 200234
- China
| | - Jie Wang
- The Key Laboratory of Resource Chemistry of Ministry of Education
- Shanghai Key Laboratory of Rare Earth Functional Materials, and Shanghai Municipal Education Committee Key Laboratory of Molecular Imaging Probes and Sensors
- Shanghai Normal University
- Shanghai 200234
- China
| | - Hongyu Jin
- The Key Laboratory of Resource Chemistry of Ministry of Education
- Shanghai Key Laboratory of Rare Earth Functional Materials, and Shanghai Municipal Education Committee Key Laboratory of Molecular Imaging Probes and Sensors
- Shanghai Normal University
- Shanghai 200234
- China
| | - Jing Wang
- The Key Laboratory of Resource Chemistry of Ministry of Education
- Shanghai Key Laboratory of Rare Earth Functional Materials, and Shanghai Municipal Education Committee Key Laboratory of Molecular Imaging Probes and Sensors
- Shanghai Normal University
- Shanghai 200234
- China
| | - Hong Yang
- The Key Laboratory of Resource Chemistry of Ministry of Education
- Shanghai Key Laboratory of Rare Earth Functional Materials, and Shanghai Municipal Education Committee Key Laboratory of Molecular Imaging Probes and Sensors
- Shanghai Normal University
- Shanghai 200234
- China
| | - Zhiguo Zhou
- The Key Laboratory of Resource Chemistry of Ministry of Education
- Shanghai Key Laboratory of Rare Earth Functional Materials, and Shanghai Municipal Education Committee Key Laboratory of Molecular Imaging Probes and Sensors
- Shanghai Normal University
- Shanghai 200234
- China
| | - Qiwei Tian
- The Key Laboratory of Resource Chemistry of Ministry of Education
- Shanghai Key Laboratory of Rare Earth Functional Materials, and Shanghai Municipal Education Committee Key Laboratory of Molecular Imaging Probes and Sensors
- Shanghai Normal University
- Shanghai 200234
- China
| | - Shiping Yang
- The Key Laboratory of Resource Chemistry of Ministry of Education
- Shanghai Key Laboratory of Rare Earth Functional Materials, and Shanghai Municipal Education Committee Key Laboratory of Molecular Imaging Probes and Sensors
- Shanghai Normal University
- Shanghai 200234
- China
| |
Collapse
|
8
|
Lv J, Yang J, Hao X, Ren X, Feng Y, Zhang W. Biodegradable PEI modified complex micelles as gene carriers with tunable gene transfection efficiency for ECs. J Mater Chem B 2016; 4:997-1008. [PMID: 32263173 DOI: 10.1039/c5tb02310f] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
In recent years, gene therapy has evoked an increasing interest in clinical treatments of coronary diseases because it is a potential strategy to realize rapid endothelialization of artificial vascular grafts. The balance of high transfection efficiency and low cytotoxicity of nonviral gene carriers is an important issue to be solved. In this study, we aim to establish a gene delivery system offering an elegant way to tune the transfection activity and cytotoxicity. Biodegradable complex micelles were prepared from polyethylenimine-b-poly(lactide-co-3(S)-methyl-morpholine-2,5-dione)-b-polyethylenimine (PEI-b-PLMD-b-PEI) and methoxy-poly(ethylene glycol)-b-poly(lactide-co-3(S)-methyl-morpholine-2,5-dione) (mPEG-b-PLMD) copolymers by a co-assembly method. Then the ZNF580 gene plasmid (pDNA) was encapsulated into the complex micelles. The hydrodynamic size and zeta potential of these complex micelles and micelles/pDNA complexes indicated that they were feasible for use in cellular uptake and gene transfection. As expected, the transfection efficiency and cytotoxicity of these micelles/pDNA complexes could be conveniently tuned by changing the mass ratio of mPEG-b-PLMD to PEI-b-PLMD-b-PEI (3/1, 2/2, 1/3 and 0/4) in the mixed mPEG/PEI shell. The transfection efficiency increased as the mass ratio of mPEG-b-PLMD/PEI-b-PLMD-b-PEI decreased from 3/1 to 0/4, while the cytotoxicity showed an opposite tendency. Moreover, ZNF580 protein expression determined by Western blot analysis and the migration of transfected endothelial cells (ECs) by wound healing assay were consistent with the result of transfection efficiency. All these results indicated that the co-assembled complex micelles could act as suitable gene carriers with tunable gene transfection efficiency and cytotoxicity, which should have great potential for the transfection of vascular ECs.
Collapse
Affiliation(s)
- Juan Lv
- School of Chemical Engineering and Technology, Tianjin University, Weijin Road 92, Tianjin 300072, China.
| | | | | | | | | | | |
Collapse
|
9
|
Yu Y, Frey H. Controllable Nonspecific Protein Adsorption by Charged Hyperbranched Polyglycerol Thin Films. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:13101-13106. [PMID: 26562213 DOI: 10.1021/acs.langmuir.5b03243] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Antifouling thin films derived from charged hyperbranched polyglycerol (hbPG) layers were fabricated and evaluated. The anionic hbPG (a-hbPG) monolayers and cationic hbPG/anionic hbPG (c/a-hbPG) bilayers were adsorbed on the underlying self-assembled monolayers (SAMs) of cysteamine and 3-mercaptopropionic acid (3-MPA) by electrostatic interaction, respectively, and their procession was monitored by surface plasmon resonance spectroscopy (SPR). The adsorption of bovine serum albumin (BSA) and fibrinogen on the premade a-hbPG and c/a-hbPG thin films was measured and the capability of these thin films to resist nonspecific protein adsorption was evaluated by SPR as well. It is observed that the c/a-hbPG bilayer films possessed good antifouling properties. With c/a-hbPG bilayers consisting of higher molecular weight a-hbPG, the adsorption of BSA and fibrinogen were as low as 0.015 ng/mm(-2) and 0.0076 ng/mm(-2), respectively, comparable to the traditionally ultralow antifouling surfaces (<0.05 ng/mm(-2) of nonspecific protein adsorption). This work proved that the charged hbPG thin films can strongly reduce the nonspecific protein adsorption and have the promise for the antifouling coatings with improved performance.
Collapse
Affiliation(s)
- Yaming Yu
- College of Materials Science and Engineering, Huaqiao University , 361021, Xiamen, China
- Institute of Organic Chemistry, Johannes Gutenberg-University Mainz , Duesbergweg 10-14, D-55128, Mainz, Germany
| | - Holger Frey
- Institute of Organic Chemistry, Johannes Gutenberg-University Mainz , Duesbergweg 10-14, D-55128, Mainz, Germany
| |
Collapse
|
10
|
Nevirapine loaded Poloxamer 407/Pluronic P123 mixed micelles: Optimization of formulation and in vitro evaluation. Colloids Surf B Biointerfaces 2015; 129:100-6. [DOI: 10.1016/j.colsurfb.2015.03.030] [Citation(s) in RCA: 83] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2014] [Revised: 02/21/2015] [Accepted: 03/10/2015] [Indexed: 01/07/2023]
|
11
|
Zhang C, Liu Y, Wen S, Wang S. Poly(vinylphosphonic acid) (PVPA) on titanium alloy acting as effective cartilage-like superlubricity coatings. ACS APPLIED MATERIALS & INTERFACES 2014; 6:17571-17578. [PMID: 25244595 DOI: 10.1021/am503399u] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Poly(vinylphosphonic acid) (PVPA) is a type of hydrophilic polymer that can be used in surface modifications. In our study, PVPA coatings were formed on the surfaces of titanium alloy (Ti6Al4V) using a simple and novel method to achieve efficient lubrication at friction interfaces. The composition and 3D skeletal structure of the PVPA coatings were confirmed by X-ray photoelectron spectroscopy (XPS), focused ion beam/scanning electron microscopy (FIB/SEM), and solid-state nuclear magnetic resonance (NMR). The PVPA-modified Ti6Al4V/polytetrafluoroethylene (PTFE) interface shows a superlow friction coefficient (approximately 0.006) for at least 8 h under a contact pressure of 44.2 MPa (initial pressure), which means it falls into the superlubricity regime. Moreover, wear on the surfaces of both the Ti6Al4V and PTFE after the tribological experiment is superlow. It is proposed that the 3D skeletal structure of the PVPA coating and fluid-like manner at friction interfaces owing to the fast exchange of water molecules are the main factors accounting for the superlow friction and wear. The PVPA-modified Ti6Al4V has the potential uses in artificial cervical discs.
Collapse
Affiliation(s)
- Caixia Zhang
- State Key Laboratory of Tribology, Tsinghua University , Beijing 100084, China
| | | | | | | |
Collapse
|
12
|
Lv J, Hao X, Yang J, Feng Y, Behl M, Lendlein A. Self-Assembly of Polyethylenimine-Modified Biodegradable Complex Micelles as Gene Transfer Vector for Proliferation of Endothelial Cells. MACROMOL CHEM PHYS 2014. [DOI: 10.1002/macp.201400345] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Juan Lv
- School of Chemical Engineering and Technology; Collaborative Innovation Center of Chemical Science and Chemical Engineering (Tianjin); Tianjin University; Weijin Road 92 Tianjin 300072 China
- Key Laboratory of Systems Bioengineering of Ministry of Education; Tianjin University; Weijin Road 92 Tianjin 300072 China
| | - Xuefang Hao
- School of Chemical Engineering and Technology; Collaborative Innovation Center of Chemical Science and Chemical Engineering (Tianjin); Tianjin University; Weijin Road 92 Tianjin 300072 China
- Key Laboratory of Systems Bioengineering of Ministry of Education; Tianjin University; Weijin Road 92 Tianjin 300072 China
| | - Jing Yang
- School of Chemical Engineering and Technology; Collaborative Innovation Center of Chemical Science and Chemical Engineering (Tianjin); Tianjin University; Weijin Road 92 Tianjin 300072 China
- Key Laboratory of Systems Bioengineering of Ministry of Education; Tianjin University; Weijin Road 92 Tianjin 300072 China
| | - Yakai Feng
- School of Chemical Engineering and Technology; Collaborative Innovation Center of Chemical Science and Chemical Engineering (Tianjin); Tianjin University; Weijin Road 92 Tianjin 300072 China
- Key Laboratory of Systems Bioengineering of Ministry of Education; Tianjin University; Weijin Road 92 Tianjin 300072 China
| | - Marc Behl
- Institute of Biomaterial Science and Berlin-Brandenburg Center for Regenerative Therapies (BCRT); Helmholtz-Zentrum Geesthacht; Kantstr. 55 14513 Teltow Germany
| | - Andreas Lendlein
- Institute of Biomaterial Science and Berlin-Brandenburg Center for Regenerative Therapies (BCRT); Helmholtz-Zentrum Geesthacht; Kantstr. 55 14513 Teltow Germany
| |
Collapse
|
13
|
Conn G, Kidane AG, Punshon G, Kannan RY, Hamilton G, Seifalian AM. Is there an alternative to systemic anticoagulation, as related to interventional biomedical devices? Expert Rev Med Devices 2014; 3:245-61. [PMID: 16515390 DOI: 10.1586/17434440.3.2.245] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
To reduce the toxic effects, related clinical problems and complications such as bleeding disorders associated with systemic anticoagulation, it has been hypothesized that by coating the surfaces of medical devices, such as stents, bypass grafts, extracorporeal circuits, guide wires and catheters, there will be a significant reduction in the requirement for systemic anticoagulation or, ideally, it will no longer be necessary. However, current coating processes, even covalent ones, still result in leaching followed by reduced functionality. Alternative anticoagulants and related antiplatelet agents have been used for improvement in terms of reduced restenosis, intimal hyperphasia and device failure. This review focuses on existing heparinization processes, their application in clinical devices and the updated list of alternatives to heparinization in order to obtain a broad overview, it then highlights, in particular, the future possibilities of using heparin and related moieties to tissue engineer scaffolds.
Collapse
Affiliation(s)
- Gemma Conn
- Biomaterials & Tissue Engineering Centre, Academic Division of Surgical and Interventional Sciences, University College London, Rowland Hill Street, Hampstead, London NW3 2PF, UK
| | | | | | | | | | | |
Collapse
|
14
|
Jiang T, Li Y, Lv Y, Cheng Y, He F, Zhuo R. Biodegradable amphiphilic block-graft copolymers based on methoxy poly(ethylene glycol)-b-(polycarbonates-g-polycarbonates) for controlled release of doxorubicin. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2014; 25:131-139. [PMID: 24062230 DOI: 10.1007/s10856-013-5057-4] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/15/2013] [Accepted: 09/16/2013] [Indexed: 06/02/2023]
Abstract
In this paper, novel biodegradable amphiphilic block-graft copolymers based on methoxy poly(ethylene glycol)-b-(polycarbonates-g-polycarbonates) (mPEG-b-(PATMC-g-PATMC)) were synthesized successfully for controlled release of doxorubicin (DOX). Backbone block copolymer, methoxy poly(ethylene glycol)-b-poly(5-allyloxy-1,3-dioxan-2-one) (mPEG-b-PATMC) was synthesized in bulk catalyzed by immobilized porcine pancreas lipase (IPPL). Then, mPEG-b-PATMC-O, the allyl epoxidation product of mPEG-b-PATMC, was further grafted by PATMC itself also using IPPL as the catalyst. The copolymers were characterized by (1)N HMR and gel permeation chromatography results showed narrow molecular weight distributions. Stable micelle solutions could be prepared by dialysis method, while a monomodal and narrow size distribution could be obtained. Transmission electron microscopy (TEM) observation showed the micelles dispersed in spherical shape with nano-size before and after DOX loading. Compared with the block copolymers, the grafted structure could enhance the interaction of polymer chains with drug molecules and improve the drug-loading capacity and entrapment efficiency. Furthermore, the amphiphilic block-graft copolymers mPEG-b-(PATMC-g-PATMC) had low cytotoxicity and more sustained drug release behavior.
Collapse
Affiliation(s)
- Tao Jiang
- Key Laboratory of Biomedical Polymers of Ministry of Education, Department of Chemistry, Wuhan University, Wuhan, 430072, China
| | | | | | | | | | | |
Collapse
|
15
|
Synthesis of Fluorinated Amphiphilic Block Copolymers Based on PEGMA, HEMA, and MMA via ATRP and CuAAC Click Chemistry. INT J POLYM SCI 2014. [DOI: 10.1155/2014/464806] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Synthesis of fluorinated amphiphilic block copolymers via atom transfer radical polymerization (ATRP) and Cu(I) catalyzed Huisgen 1,3-dipolar cycloaddition (CuAAC) was demonstrated. First, a PEGMA and MMA based block copolymer carrying multiple side-chain acetylene moieties on the hydrophobic segment for postfunctionalization was carried out. This involves the synthesis of a series of P(HEMA-co-MMA) random copolymers to be employed as macroinitiators in the controlled synthesis of P(HEMA-co-MMA)-block-PPEGMA block copolymers by using ATRP, followed by a modification step on the hydroxyl side groups of HEMA via Steglich esterification to afford propargyl side-functional polymer, alkyne-P(HEMA-co-MMA)-block-PPEGMA. Finally, click coupling between side-chain acetylene functionalities and 2,3,4,5,6-pentafluorobenzyl azide yielded fluorinated amphiphilic block copolymers. The obtained polymers were structurally characterized by1H-NMR,19F-NMR, FT-IR, and GPC. Their thermal characterizations were performed using DSC and TGA.
Collapse
|
16
|
Yau JW, Stafford AR, Liao P, Fredenburgh JC, Roberts R, Brash JL, Weitz JI. Corn trypsin inhibitor coating attenuates the prothrombotic properties of catheters in vitro and in vivo. Acta Biomater 2012; 8:4092-100. [PMID: 22824529 DOI: 10.1016/j.actbio.2012.07.019] [Citation(s) in RCA: 60] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2012] [Revised: 06/21/2012] [Accepted: 07/13/2012] [Indexed: 11/18/2022]
Abstract
Catheters initiate coagulation by activating factor (f) XII, which can lead to catheter thrombosis. Fondaparinux, which only targets activated fX (fXa), is associated with more catheter thrombosis than heparin, which targets fXa and thrombin. To render catheters less thrombogenic and fondaparinux more effective, we examined whether coating catheters with corn trypsin inhibitor (CTI), which blocks fXIIa, attenuates catheter-induced clotting and promotes fondaparinux activity. Compared with unmodified catheters, CTI-coated catheters demonstrated (a) decreased adsorption of fibrinogen and fXII, (b) greater inhibition of fXIIa generated by catheter-induced autoactivation, (c) attenuated fXIIa-mediated activation of fXI and (d) longer plasma clotting times in the absence or presence of fondaparinux. In an accelerated catheter thrombosis model in rabbits, (a) the time to catheter occlusion was longer with CTI-coated catheters than with unmodified catheters and (b) an intravenous dose of fondaparinux that had no effect on the time to occlusion of unmodified catheters extended the time to occlusion of CTI-coated catheters. These findings support the concept that the prothrombotic activity of catheters reflects their capacity to activate fXII and identify CTI immobilization as a novel approach for rendering catheters and other blood-contacting medical devices less thrombogenic.
Collapse
Affiliation(s)
- Jonathan W Yau
- School of Biomedical Engineering, McMaster University, Hamilton, Ontario, Canada
| | | | | | | | | | | | | |
Collapse
|
17
|
Kyomoto M, Moro T, Saiga K, Hashimoto M, Ito H, Kawaguchi H, Takatori Y, Ishihara K. Biomimetic hydration lubrication with various polyelectrolyte layers on cross-linked polyethylene orthopedic bearing materials. Biomaterials 2012; 33:4451-9. [PMID: 22465336 DOI: 10.1016/j.biomaterials.2012.03.028] [Citation(s) in RCA: 68] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2011] [Accepted: 03/07/2012] [Indexed: 12/01/2022]
Abstract
Natural joints rely on fluid thin-film lubrication by the hydrated polyelectrolyte layer of cartilage. However, current artificial joints with polyethylene (PE) surfaces have considerably less efficient lubrication and thus much greater wear, leading to osteolysis and aseptic loosening. This is considered a common factor limiting prosthetic longevity in total hip arthroplasty (THA). However, such wear could be mitigated by surface modification to mimic the role of cartilage. Here we report the development of nanometer-scale hydrophilic layers with varying charge (nonionic, cationic, anionic, or zwitterionic) on cross-linked PE (CLPE) surfaces, which could fully mimic the hydrophilicity and lubricity of the natural joint surface. We present evidence to support two lubrication mechanisms: the primary mechanism is due to the high level of hydration in the grafted layer, where water molecules act as very efficient lubricants; and the secondary mechanism is repulsion of protein molecules and positively charged inorganic ions by the grafted polyelectrolyte layer. Thus, such nanometer-scaled hydrophilic polymers or polyelectrolyte layers on the CLPE surface of acetabular cup bearings could confer high durability to THA prosthetics.
Collapse
Affiliation(s)
- Masayuki Kyomoto
- Department of Materials Engineering, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | | | | | | | | | | | | | | |
Collapse
|
18
|
|
19
|
Gao J, Yu J, Ma Y. Surface modification of plasma-pretreated expanded poly (tetrafluroethylene) films by graft copolymerization. SURF INTERFACE ANAL 2012. [DOI: 10.1002/sia.3865] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Jing Gao
- College of Textiles; Donghua University; Shanghai 201620 China
- Engineering Research Center of Technical Textiles, Ministry of Education; Donghua University; Shanghai 201620 China
| | - Jianyong Yu
- Modern Textile Institute; Donghua University; Shanghai 200051 China
- Key Laboratory of Textile Science & Technology, Ministry of Education; Shanghai 201620 China
| | - Yizi Ma
- HongYe Machinery CO., LTD; Jiangsu 224043 China
| |
Collapse
|
20
|
Kyomoto M, Moro T, Takatori Y, Kawaguchi H, Ishihara K. Cartilage-mimicking, high-density brush structure improves wear resistance of crosslinked polyethylene: a pilot study. Clin Orthop Relat Res 2011; 469:2327-36. [PMID: 21132412 PMCID: PMC3126960 DOI: 10.1007/s11999-010-1718-5] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
BACKGROUND In natural synovial joints under physiologic conditions, fluid thin-film lubrication by a hydrated layer of the cartilage is essential for the smooth motion of the joints. The considerably less efficient lubrication of artificial joints of polyethylene is prone to wear, leading to osteolysis and aseptic loosening and limiting the longevity of THA. A nanometer-scale layer of poly(2-methacryloyloxyethyl phosphorylcholine) (PMPC) with cartilage-mimicking brushlike structures on a crosslinked polyethylene (CLPE) surface may provide hydrophilicity and lubricity resembling the physiologic joint surface. QUESTIONS/PURPOSES We asked whether the photoirradiation time during graft polymerization would affect the density and stability of the PMPC layer and the PMPC-grafted surface would enhance the durability of artificial joints. We investigated the effect of photoirradiation time and the resultant characteristics of the PMPC layer on the durability of the CLPE. METHODS For each of the PMPC-grafted CLPE surfaces with various photoirradiation times (six groups: 0 [untreated CLPE], 11, 23, 45, 90, and 180 minutes), 18 sample pieces (total of 108 samples) were evaluated in surface analyses, and four cups (total of 24 samples) were evaluated in a hip simulator test. RESULTS The density of the PMPC layer increased with an increase in the photoirradiation time. The hip simulator test confirmed the PMPC-grafted CLPE with a high density of the PMPC layer exhibited minimal wear as compared with the untreated CLPE. High-density PMPC grafting appears essential for maintaining the high wear resistance of the PMPC-grafted CLPE. To obtain a high-density PMPC layer, the photoirradiation time must be greater than 45 minutes. CONCLUSIONS The cartilage-mimicking, density brushlike structure of the PMPC-grafted CLPE could extend high durability to acetabular cups in THA. CLINICAL RELEVANCE Our in vitro findings suggest the wear performance of CLPE acetabular cups in THA can be improved by this approach.
Collapse
Affiliation(s)
- Masayuki Kyomoto
- Research Department, Japan Medical Materials Corp, 3-3-31, Miyahara, Yodogawa-ku, Osaka, 532-0003, Japan.
| | | | | | | | | |
Collapse
|
21
|
Wang X, Yue X, Wang X, Guo Q. Surface Modification of Poly(tetrafluoroethylene) Microporous Membranes by Acrylic Acid Liquid-Phase Graft Copolymerization. J MACROMOL SCI B 2011. [DOI: 10.1080/00222348.2010.549074] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- Xuyun Wang
- a College of Chemical Engineering , Qingdao University of Science and Technology , Qingdao, China
| | - Xuehai Yue
- a College of Chemical Engineering , Qingdao University of Science and Technology , Qingdao, China
| | - Xin Wang
- b Key Lab of Rubber-Plastics , Ministry of Education, Qingdao University of Science and Technology , Qingdao, China
| | - Qingjie Guo
- a College of Chemical Engineering , Qingdao University of Science and Technology , Qingdao, China
| |
Collapse
|
22
|
Bodas D, Rauch JY, Khan-Malek C. Creation of a stable hydrophilic poly(dimethyl siloxane) surface by the plasma-induced crosslinking of monomers. J Appl Polym Sci 2010. [DOI: 10.1002/app.33089] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
|
23
|
Tan BH, Hussain H, Liu Y, He CB, Davis TP. Synthesis and self-assembly of brush-type poly[poly(ethylene glycol)methyl ether methacrylate]-block-poly(pentafluorostyrene) amphiphilic diblock copolymers in aqueous solution. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:2361-2368. [PMID: 19785395 DOI: 10.1021/la902816b] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Well-defined fluorinated brush-like amphiphilic diblock copolymers of poly[poly(ethylene glycol)methyl ether methacrylate] (P(PEGMA)) and poly(pentafluorostyrene) (PPFS) have been successfully synthesized via atom transfer radical polymerization (ATRP). The self-assembly behavior of these polymers in aqueous solutions was studied using (1)H NMR, fluorescence spectrometry, static and dynamic light scattering and transmission electron microscopy techniques. The micellar structure comprised of PPFS as the core and brush-like (hydrophobic main chain and hydrophilic branches) polymers as the coronas. The hydrodynamic radius (R(h)) of the micelles in aqueous solution was in the nanometer range, independent of the polymer concentration, consistent with a closed association model. Diblock copolymers with a longer P(PEGMA) block formed micelles with smaller R(h) and lower aggregation numbers consistent with an improved solubilization of the core. The micelles possessed a thick hydration layer as verified by the ratio of the radius of gyration, R(g) to the hydrodynamic radius, R(h). The aggregation number and ratio of R(g) to R(h) were observed to increase with temperature (20-50 degrees C), while the R(h) of the micelle decreased slightly over the same temperature range. An increase in temperature induced the brush-like PEG segments in the corona to dehydrate and shrink while forming micelles with larger aggregation numbers.
Collapse
Affiliation(s)
- B H Tan
- Institute of Materials Research and Engineering, Agency for Science, Technology and Research, 3 Research Link, Singapore 117602.
| | | | | | | | | |
Collapse
|
24
|
Kyomoto M, Moro T, Iwasaki Y, Miyaji F, Kawaguchi H, Takatori Y, Nakamura K, Ishihara K. Superlubricious surface mimicking articular cartilage by grafting poly(2-methacryloyloxyethyl phosphorylcholine) on orthopaedic metal bearings. J Biomed Mater Res A 2009; 91:730-41. [DOI: 10.1002/jbm.a.32280] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
|
25
|
|
26
|
Vandencasteele N, Nisol B, Viville P, Lazzaroni R, Castner DG, Reniers F. Study of plasma modified-PTFE for biological applications: relationship between protein resistant properties, plasma treatment, surface composition and surface roughness. PLASMA PROCESSES AND POLYMERS (PRINT) 2008; 5:661-671. [PMID: 24795545 PMCID: PMC4007513 DOI: 10.1002/ppap.200700143] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
PTFE samples were treated by low-pressure, O2 RF plasmas. The adsorption of BSA was used as a probe for the protein resistant properties. The exposure of PTFE to an O2 plasma leads to an increase in the chamber pressure. OES reveals the presence of CO, CO2 and F in the gas phase, indicating a strong etching of the PTFE surface by the O2 plasma. Furthermore, the high resolution C1s spectrum shows the appearance of CF3, CF and C-CF components in addition to the CF2 component, which is consistent with etching of the PTFE surface. WCA as high as 160° were observed, indicating a superhydrophobic behaviour. AFM Images of surfaces treated at high plasma power showed a increase in roughness. Lower amounts of BSA adsorption were detected on high power, O2 plasma-modified PTFE samples compared to low power, oxygen plasma-modified ones.
Collapse
Affiliation(s)
- Nicolas Vandencasteele
- Université Libre de Bruxelles, Faculty of Sciences, Analytical and Interfacial Chemistry, cp 255, bld Triomphe 2, B-1050 Bruxelles, Belgium
| | - Bernard Nisol
- Université Libre de Bruxelles, Faculty of Sciences, Analytical and Interfacial Chemistry, cp 255, bld Triomphe 2, B-1050 Bruxelles, Belgium
| | - Pascal Viville
- Laboratory for Chemistry of NoVel Materials, Université de Mons-Hainaut/Materia NoVa, Place du Parc, 20, B-7000 Mons, Belgium
| | - Roberto Lazzaroni
- Laboratory for Chemistry of NoVel Materials, Université de Mons-Hainaut/Materia NoVa, Place du Parc, 20, B-7000 Mons, Belgium
| | - David G. Castner
- National ESCA and Surface Analysis Center for Biomedical Problems, Departments of Chemical Engineering and Bioengineering, University of Washington, Box 351750, Seattle, Washington 98195, USA
| | - François Reniers
- Université Libre de Bruxelles, Faculty of Sciences, Analytical and Interfacial Chemistry, cp 255, bld Triomphe 2, B-1050 Bruxelles, Belgium
| |
Collapse
|
27
|
Kyomoto M, Moro T, Miyaji F, Hashimoto M, Kawaguchi H, Takatori Y, Nakamura K, Ishihara K. Effect of 2‐methacryloyloxyethyl phosphorylcholine concentration on photo‐induced graft polymerization of polyethylene in reducing the wear of orthopaedic bearing surface. J Biomed Mater Res A 2008; 86:439-47. [DOI: 10.1002/jbm.a.31511] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
|
28
|
Murphy JJ, Furusho H, Paton RM, Nomura K. Precise synthesis of poly(macromonomer)s containing sugars by repetitive ROMP and their attachments to poly(ethylene glycol): synthesis, TEM analysis and their properties as amphiphilic block fragments. Chemistry 2008; 13:8985-97. [PMID: 17668433 DOI: 10.1002/chem.200700291] [Citation(s) in RCA: 63] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Various poly(macromonomer)s (PMMs) have been prepared by a repeating ring opening metathesis polymerization (ROMP) technique using the well-defined molybdenum initiators of the type, [Mo(CHCMe(2)Ph)(NAr)(OR)(2)] with OR=OCMe(3), OCMeC(CF(3))(2); Ar=2,6-iPr(2)C(6)H(3), 2,6-Me(2)C(6)H(3). The synthetic strategy is based on the polymerization of norbornene and its derivatives affording di- and triblock side chains bearing sugars (mannose, galactose, glucose etc.), linked via O- (ester), and glycosidase resistant C- (isoxazoline) glycosides. The efficient placement of norbornene units on the side chain termini and their conversion into PMMs, facilitated by the Mo alkylidenes, proceeded in a living manner with the quantitative initiation. The methodology was applied to prepare poly(macromonomer)-graft-PEG [PEG: poly(ethylene glycol)], by the attachment of a pseudo phenol terminus on the PMM main chain to PEG-Ms(2) [MsO(CH(2)CH(2)O)(n)Ms, Ms=MeSO(2)] using a "grafting to" approach. Removal of the acetal protecting groups from the sugar coating of a variety of supramolecular structures including PMMs, linear amphiphilic block copolymers (ABC) and a PMM-graft-PEGby using trifluroacetic acid/water (9:1), and suspension in water, prompted the spontaneous formation of spherical architectures by self-assembly of the amphiphilic PMMs as observed by transmission electron microscopy (TEM). The ability to uptake the hydrophobic dye (Nile Red) into the micellar cores of a variety of amphiphilic polymeric fragments is a significant step towards the production of sugar-coated nanospheres for cell-targeting biomimetic applications.
Collapse
Affiliation(s)
- James J Murphy
- Graduate School of Materials Science, Nara Institute of Science and Technology, 8916-5 Takayama, Ikoma, Nara 630-0101, Japan
| | | | | | | |
Collapse
|
29
|
|
30
|
HUANG N, LENG Y, YANG P, WANG J, CHEN J, WAN G. Biomedical Applications of Plasma and Ion Beam Processing. ACTA ACUST UNITED AC 2008. [DOI: 10.3131/jvsj2.51.81] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
|
31
|
Aumsuwan N, Heinhorst S, Urban MW. Antibacterial Surfaces on Expanded Polytetrafluoroethylene; Penicillin Attachment. Biomacromolecules 2007; 8:713-8. [PMID: 17291097 DOI: 10.1021/bm061050k] [Citation(s) in RCA: 65] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Expanded polytetrafluoroethylene (ePTFE) was chemically modified to retard the growth of Staphylococcus aureus bacteria. This was accomplished by microwave plasma reactions in the presence of maleic anhydride (MA) to create acid functional groups on ePTFE surfaces, followed by esterification reactions with 200 and 600 molecular weight linear polyethylene glycol (PEG). Such surfaces were utilized for further reactions with penicillin (PEN) through etherification reactions to create anti-microbial surfaces. These reactions resulted in surface morphological changes, and spectroscopic analysis using attenuated total reflectance Fourier transform infrared spectroscopy (ATR FT-IR) revealed the formation of ester linkages resulting from reactions between PEN and PEG functionalities. Antibacterial activities were evaluated by a series of experiments where PEN-modified ePTFE specimens were immersed in a liquid aureus culture, and the bacteria growth was quantified by measuring % absorbance of the suspension at 600 nm wavelength. The lowest absorbance was observed for the solution containing PEN-PEG-MA-ePTFE specimens, thus showing highly effective anti-bacterial activity toward gram-positive Staphylococcus aureus bacteria. To our best knowledge, this is the first study that shows PEN-ePTFE surface modifications that are effective against gram-positive aureus bacteria.
Collapse
Affiliation(s)
- Nattharika Aumsuwan
- School of Polymers and High Performance Materials, Shelby F. Thames Polymer Science Research Center, The University of Southern Mississippi, Hattiesburg, Mississippi 39406, USA
| | | | | |
Collapse
|
32
|
Yu DG, Lin WC, Lin CH, Yang MC. Cytocompatibility and Antibacterial Activity of a PHBV Membrane with Surface-Immobilized Water-Soluble Chitosan and Chondroitin-6-sulfate. Macromol Biosci 2006; 6:348-57. [PMID: 16680808 DOI: 10.1002/mabi.200600026] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
A water-soluble chitosan (WSC)/chondroitin-6-sulfate (ChS) polyelectrolyte complex (PEC) is covalently immobilized onto the surface of poly(3-hydroxybutyric acid-co-3-hydroxyvaleric acid) (PHBV) membranes via ozone-induced oxidation and poly(acrylic acid) (PAA) graft polymerization. To characterize the modified membranes, X-ray photoelectron spectroscopy (XPS) and water contact angle measurements are performed. It is shown that by coupling WSC as a spacer, the amount of ChS immobilized can be significantly increased. The water contact angle decreases with the amount of PAA, WSC, and ChS immobilized, which indicates the improving hydrophilicity. After WSC- and PEC-immobilization modification, the PHBV membranes possess antibacterial activity against S. aureus, E. coli, P. aeruginosa, and Methicilin resistant Staphylococus aureus (MRSA). According to the L929 fibroblast cell growth inhibition index, the as-prepared PHBV membranes are non-cytotoxic. In addition, the in-vitro evaluation of L929 fibroblast attachment, proliferation, and viability of PEC-immobilized PHBV membranes are ascertained to be superior to those of immobilized WSC or ChS alone. The overall results demonstrate that WSC/ChS PEC immobilization can not only improve the hydrophilicity and cytocompatibility of the PHBV membrane, but also endows antibacterial activity. [GRAPH: SEE TEXT] The bacterial survival ratio of as-prepared PHBV membranes (n=3).
Collapse
Affiliation(s)
- Da-Guang Yu
- Department of Textile Science, Nanya Institute of Technology, Chung-Li, Tao-Yuan, Taiwan ROC
| | | | | | | |
Collapse
|
33
|
Shan B, Yan H, Shen J, Lin S. Ozone-induced grafting of a sulfoammonium zwitterionic polymer onto low-density polyethylene film for improving hemocompatibility. J Appl Polym Sci 2006. [DOI: 10.1002/app.20860] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
|
34
|
Cheng Z, Zhu X, Kang ET, Neoh KG. Brush-type amphiphilic diblock copolymers from "living"/controlled radical polymerizations and their aggregation behavior. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2005; 21:7180-5. [PMID: 16042439 DOI: 10.1021/la051038y] [Citation(s) in RCA: 72] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
Two brush-type amphiphilic diblock copolymers, poly(poly(ethylene glycol)methyl ether methacrylate-block-polystyrene) (P(PEGMA)-b-PS) and poly(glycidyl methacrylate)-block-poly(poly(ethylene glycol)methyl ether methacrylate) (P(GMA)-b-P(PEGMA)) were synthesized, respectively, via consecutive atom-transfer radical polymerizations (ATRPs) and reversible addition-fragmentation chain-transfer (RAFT) polymerizations. The diblock copolymers were characterized by gel permeation chromatography (GPC), (1)H nuclear magnetic resonance (NMR) spectroscopy, and FT-IR spectroscopy. The aggregation behavior of the two amphiphilic diblock copolymers in water was also studied. Scanning electron and transmission electron microscopic images revealed that spherical micelles (40-80 nm in diameter) from self-assembly of the P(PEGMA)-b-PS copolymers and wormlike micelles (60-120 nm in length and 20-30 nm in diameter) from self-assembly of the P(GMA)-b-P(PEGMA) copolymers were prevalent. The spherical P(PEGMA)-b-PS micelles could self-assemble gradually into giant aggregates of several micrometers in diameter.
Collapse
Affiliation(s)
- Zhenping Cheng
- Department of Chemical and Biomolecular Engineering, National University of Singapore, Kent Ridge, Singapore 119260
| | | | | | | |
Collapse
|
35
|
Murphy JJ, Kawasaki T, Fujiki M, Nomura K. Precise Synthesis of Amphiphilic Polymeric Architectures by Grafting Poly(ethylene glycol) to End-Functionalized Block ROMP Copolymers. Macromolecules 2005. [DOI: 10.1021/ma047887u] [Citation(s) in RCA: 60] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- James J. Murphy
- Graduate School of Materials Science, Nara Institute of Science and Technology (NAIST), 8916-5 Takayama, Ikoma, Nara 630-0101, Japan
| | - Tetsuharu Kawasaki
- Graduate School of Materials Science, Nara Institute of Science and Technology (NAIST), 8916-5 Takayama, Ikoma, Nara 630-0101, Japan
| | - Michiya Fujiki
- Graduate School of Materials Science, Nara Institute of Science and Technology (NAIST), 8916-5 Takayama, Ikoma, Nara 630-0101, Japan
| | - Kotohiro Nomura
- Graduate School of Materials Science, Nara Institute of Science and Technology (NAIST), 8916-5 Takayama, Ikoma, Nara 630-0101, Japan
| |
Collapse
|
36
|
Voskerician G, Gingras PH, Anderson JM. Macroporous condensed poly(tetrafluoroethylene). I.In vivo inflammatory response and healing characteristics. J Biomed Mater Res A 2005; 76:234-42. [PMID: 16116600 DOI: 10.1002/jbm.a.30481] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
This study was designed to determine whether the novel spatial geometry of macroporous condensed poly(tetrafluoroethylene) (cPTFE) favorably affects the in vivo repair process. Specifically, the macroporous surface geometry and the reduced material thickness contribute to better healing characteristics. For this purpose, three other materials used for abdominal wall repair were selected, expanded poly(tetrafluoroethylene) (ePTFE), low-weight poly(propylene) (lwPP), and high-weight poly(propylene) (hwPP). Samples of each material (1 x 2 cm, n = 4) were implanted subcutaneously in rats for 7, 28, or 56 days. After sacrificing the animals, at each time point, the tissue implant sites were subjected to morphometric analysis and evaluation of inflammatory and wound-healing tissue characteristics. Although the fibrous capsule thickness did not significantly vary among the four materials (p > 0.05), cPTFE consistently led to the most mature fibrous capsule. However, ePTFE showed the greatest tissue-material integration. Both PP materials presented various levels of tissue integration, but they were characterized by significant early inflammation and increased foreign body reaction around the mesh openings, especially for hwPP. In contrast, cPTFE did not induce extensive inflammation or elevated foreign body reaction around its mesh openings. We conclude that cPTFE combines the inherent PTFE biocompatibility with low polymer surface area (large mesh openings, reduced material thickness) leading to a better inflammatory and wound healing response compared to available materials used in abdominal wall reconstruction.
Collapse
Affiliation(s)
- Gabriela Voskerician
- Institute of Pathology, Case Western Reserve University, Cleveland, OH 44106, USA.
| | | | | |
Collapse
|
37
|
Biocompatibility and antibacterial activity of chitosan and collagen immobilized poly(3-hydroxybutyric acid-co-3-hydroxyvaleric acid). Carbohydr Polym 2004. [DOI: 10.1016/j.carbpol.2004.06.039] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
|
38
|
Heitz J, Svorcík V, Bacáková L, Rocková K, Ratajová E, Gumpenberger T, Bäuerle D, Dvoránková B, Kahr H, Graz I, Romanin C. Cell adhesion on polytetrafluoroethylene modified by UV-irradiation in an ammonia atmosphere. J Biomed Mater Res A 2003; 67:130-7. [PMID: 14517870 DOI: 10.1002/jbm.a.10043] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
We report on the modification of polytetrafluoroethylene (PTFE) by exposure to the ultraviolet (UV) light of a Xe(2)*-excimer lamp at a wavelength of 172 nm in an ammonia atmosphere. Typical treatment times were up to 30 min. Subsequently, the samples were grafted with the amino acid alanine from an aqueous solution. The samples were characterized by means of optical transmission spectroscopy, laser-induced fluorescence and contact-angle measurements. We studied the adhesion of rat aortic smooth muscle cells (SMC) and mouse fibroblasts (3T3 cells) to the modified polymer samples using an in vitro technique, where the population density and spread of adhering cells is determined 24 h after seeding by image analysis. For both cell types the exposure of PTFE to UV-light in an ammonia atmosphere resulted in a significant increase in the number of adhering cells and in the size of their spreading area. The grafting with alanine enhanced this effect. Additional experiments with human endothelial cells (HEC) also demonstrated improved adhesion to modified PTFE. Thus, PTFE modified by our method appears to be a promising material for fabrication of artificial vascular prostheses and implants or for cultivation of skin substitutes.
Collapse
Affiliation(s)
- J Heitz
- Angewandte Physik, Johannes Kepler Universität, A-4040 Linz, Austria.
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
39
|
Abstract
Amphiphilic block copolymers (ABCs) have been used extensively in pharmaceutical applications ranging from sustained-release technologies to gene delivery. The utility of ABCs for delivery of therapeutic agents results from their unique chemical composition, which is characterized by a hydrophilic block that is chemically tethered to a hydrophobic block. In aqueous solution, polymeric micelles are formed via the association of ABCs into nanoscopic core/shell structures at or above the critical micelle concentration. Upon micellization, the hydrophobic core regions serve as reservoirs for hydrophobic drugs, which may be loaded by chemical, physical, or electrostatic means, depending on the specific functionalities of the core-forming block and the solubilizate. Although the Pluronics, composed of poly(ethylene oxide)-block-poly(propylene oxide)-block-poly(ethylene oxide), are the most widely studied ABC system, copolymers containing poly(L-amino acid) and poly(ester) hydrophobic blocks have also shown great promise in delivery applications. Because each ABC has unique advantages with respect to drug delivery, it may be possible to choose appropriate block copolymers for specific purposes, such as prolonging circulation time, introduction of targeting moieties, and modification of the drug-release profile. ABCs have been used for numerous pharmaceutical applications including drug solubilization/stabilization, alteration of the pharmacokinetic profile of encapsulated substances, and suppression of multidrug resistance. The purpose of this minireview is to provide a concise, yet detailed, introduction to the use of ABCs and polymeric micelles as delivery agents as well as to highlight current and past work in this area.
Collapse
Affiliation(s)
- Monica L Adams
- Division of Pharmaceutical Sciences, School of Pharmacy, University of Wisconsin-Madison, 777 Highland Avenue, Madison, WI 53705-2222, USA
| | | | | |
Collapse
|
40
|
Hu SG, Jou CH, Yang MC. Protein adsorption, fibroblast activity and antibacterial properties of poly(3-hydroxybutyric acid-co-3-hydroxyvaleric acid) grafted with chitosan and chitooligosaccharide after immobilized with hyaluronic acid. Biomaterials 2003; 24:2685-93. [PMID: 12711514 DOI: 10.1016/s0142-9612(03)00079-6] [Citation(s) in RCA: 119] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Poly(3-hydroxybutyric acid-co-3-hydroxyvaleric acid) (PHBV) membrane was treated with ozone and grafted with acrylic acid. The resulting membranes were further grafted with chitosan (CS) or chitooligosaccharide (COS) via esterification. Afterward hyaluronic acid (HA) was immobilized onto CS- or COS-grafting membranes. The antibacterial activity of CS and COS against Staphylococus aureus, Escherichia coli, and Pseudomonas aeruginosa was preserved after HA immobilization. Among them, CS-grafted PHBV membrane showed higher antibacterial activity than COS-grafted PHBV membrane. In addition, after CS- or COS-grafting, the L929 fibroblasts attachment and protein adsorption were improved, while the cell number was decrease. After immobilizing HA, the cell proliferation was promoted, the protein adsorption was decreased, and the cell attachment was slightly lower than CS- or COS-grafting PHBV.
Collapse
Affiliation(s)
- S-G Hu
- Department of Polymer Engineering, National Taiwan University of Science and Technology, 43, SEC.4 Keelung Road, Taipei 10672, Taiwan
| | | | | |
Collapse
|
41
|
Modification of lipid transport through a microporous PTFE membrane wall grafted with poly(ethylene glycol). Colloids Surf B Biointerfaces 2002. [DOI: 10.1016/s0927-7765(01)00323-x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
|
42
|
Mahlti B, Werner C, Muller M, Jérĵme R, Stamm M. Protein adsorption on preadsorbed polyampholytic monolayers. JOURNAL OF BIOMATERIALS SCIENCE. POLYMER EDITION 2002; 12:995-1010. [PMID: 11787525 DOI: 10.1163/156856201753252525] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
The adsorption behaviour of five different globular proteins on pure silicon substrates and on preadsorbed polyampholytic monolayers has been investigated as a function of protein concentration. The prelayers were prepared by adsorption of the ampholytic diblock copolymerpoly(methacrylic acid)-block-poly((dimethylamino)ethyl methacrylate) (PMAA-b-PDMAEMA). This polyampholyte adsorbs in densely packed micelles directly from aqueous solution. Ellipsometry was used to determine the amount of adsorbed polyampholyte and protein. While ATR-IR spectroscopy gives information about the adsorption and desorption behaviour of the preadsorbed polyampholytic layer, the lateral structures of the dried films were investigated by scanning force microscopy (SFM). The amount of protein adsorbed was found to be strongly influenced by the preadsorbed polyampholyte compared to the adsorption on the pure silicon substrates. No displacement of the polyampholyte by the proteins was detected. In most cases the protein adsorption was reduced by the preadsorbed polyampholytic layer. The observed trends are explained by the change in electrostatic and hydrophilic characteristics of the substrates. Furthermore, the entropy of adsorption has to be taken into account.
Collapse
Affiliation(s)
- B Mahlti
- Institut für Polymerforschung Dresden eV, Germany.
| | | | | | | | | |
Collapse
|
43
|
Wang P, Tan K, Kang E, Neoh K. Plasma-induced immobilization of poly(ethylene glycol) onto poly(vinylidene fluoride) microporous membrane. J Memb Sci 2002. [DOI: 10.1016/s0376-7388(01)00548-8] [Citation(s) in RCA: 170] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
|
44
|
Affiliation(s)
- Bryony Coupe
- Chemistry Department, Mount Holyoke College, South Hadley, Massachusetts 01075
| | - Wei Chen
- Chemistry Department, Mount Holyoke College, South Hadley, Massachusetts 01075
| |
Collapse
|