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De Vos L, Van de Voorde B, Van Daele L, Dubruel P, Van Vlierberghe S. Poly(alkylene terephthalate)s: From current developments in synthetic strategies towards applications. Eur Polym J 2021. [DOI: 10.1016/j.eurpolymj.2021.110840] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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2
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Palakurthy S, K. VGR, Samudrala RK, P. AA. In vitro bioactivity and degradation behaviour of β-wollastonite derived from natural waste. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2019; 98:109-117. [DOI: 10.1016/j.msec.2018.12.101] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/07/2018] [Revised: 12/11/2018] [Accepted: 12/25/2018] [Indexed: 12/25/2022]
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3
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Buwalda SJ, Bethry A, Hunger S, Kandoussi S, Coudane J, Nottelet B. Ultrafast in situ forming poly(ethylene glycol)-poly(amido amine) hydrogels with tunable drug release properties via controllable degradation rates. Eur J Pharm Biopharm 2019; 139:232-239. [PMID: 30954658 DOI: 10.1016/j.ejpb.2019.04.006] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2018] [Revised: 02/25/2019] [Accepted: 04/03/2019] [Indexed: 11/26/2022]
Abstract
Fast in situ forming, chemically crosslinked hydrogels were prepared by the amidation reaction between N-succinimidyl ester end groups of multi-armed poly(ethylene glycol) (PEG) and amino surface groups of poly(amido amine) (PAMAM) dendrimer generation 2.0. To control the properties of the PEG/PAMAM hydrogels, PEGs were used with different arm numbers (4 or 8) as well as different linkers (amide or ester) between the PEG arms and their terminal N-succinimidyl ester groups. Oscillatory rheology measurements showed that the hydrogels form within seconds after mixing the PEG and PAMAM precursor solutions. The storage moduli increased with crosslink density and reached values up to 2.3 kPa for hydrogels based on 4-armed PEG. Gravimetrical degradation experiments demonstrated that hydrogels with ester linkages between PEG and PAMAM degrade within 2 days, whereas amide-linked hydrogels were stable for several months. The release of two different model drugs (fluorescein isothiocyanate-dextran with molecular weights of 4·103 and 2·106 g/mol, FITC-DEX4K and FITC-DEX2000K, respectively) from amide-linked hydrogels was characterized by an initial burst followed by diffusion-controlled release, of which the rate depended on the size of the drug. In contrast, the release of FITC-DEX2000K from ester-containing hydrogels was governed mainly by degradation of the hydrogels and could be modulated via the ratio between ester and amide linkages. In vitro cytotoxicity experiments indicated that the PEG/PAMAM hydrogels are non-toxic to mouse fibroblasts. These in situ forming PEG/PAMAM hydrogels can be tuned with a broad range of mechanical, degradation and release properties and therefore hold promise as a platform for the delivery of therapeutic agents.
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Affiliation(s)
- Sytze J Buwalda
- IBMM, Université de Montpellier, CNRS, ENSCM, Faculté de Pharmacie, 15 Avenue Charles Flahault, BP14491, 34093 Montpellier cedex 5, France.
| | - Audrey Bethry
- IBMM, Université de Montpellier, CNRS, ENSCM, Faculté de Pharmacie, 15 Avenue Charles Flahault, BP14491, 34093 Montpellier cedex 5, France
| | - Sylvie Hunger
- IBMM, Université de Montpellier, CNRS, ENSCM, Faculté de Pharmacie, 15 Avenue Charles Flahault, BP14491, 34093 Montpellier cedex 5, France
| | - Sofian Kandoussi
- IBMM, Université de Montpellier, CNRS, ENSCM, Faculté de Pharmacie, 15 Avenue Charles Flahault, BP14491, 34093 Montpellier cedex 5, France
| | - Jean Coudane
- IBMM, Université de Montpellier, CNRS, ENSCM, Faculté de Pharmacie, 15 Avenue Charles Flahault, BP14491, 34093 Montpellier cedex 5, France
| | - Benjamin Nottelet
- IBMM, Université de Montpellier, CNRS, ENSCM, Faculté de Pharmacie, 15 Avenue Charles Flahault, BP14491, 34093 Montpellier cedex 5, France
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4
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Liu B, Wu W. Nonisothermal crystallization kinetics of poly(butylene terephthalate)/epoxidized ethylene propylene diene rubber/glass fiber composites. POLYM ENG SCI 2018. [DOI: 10.1002/pen.24909] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Bo Liu
- Sino‐Germon Joint Research Center of Advanced MaterialsSchool of Materials Science and Engineering, East China University of Science and Technology Shanghai 200237 China
| | - Wei Wu
- Sino‐Germon Joint Research Center of Advanced MaterialsSchool of Materials Science and Engineering, East China University of Science and Technology Shanghai 200237 China
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5
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Szivek JA, Gonzales DA, Wojtanowski AM, Martinez MA, Smith JL. Mesenchymal stem cell seeded, biomimetic 3D printed scaffolds induce complete bridging of femoral critical sized defects. J Biomed Mater Res B Appl Biomater 2018; 107:242-252. [PMID: 29569331 DOI: 10.1002/jbm.b.34115] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2017] [Revised: 01/26/2018] [Accepted: 02/26/2018] [Indexed: 01/08/2023]
Abstract
No current clinical treatments provide an ideal long-term solution for repair of long bone segment defects. Incomplete healing prevents patients from returning to preinjury activity and ultimately requires additional surgery to induce healing. Obtaining autologous graft material is costly, incurs morbidity, requires surgical time, and quality material is finite. In this pilot study, 3D printed biomimetic scaffolds were used to facilitate rapid bone bridging in critical sized defects in a sheep model. An inverse trabecular pattern based on micro-CT scans of sheep trabecular bone was printed in polybutylene terephthalate. Scaffolds were coated with micron-sized tricalcium phosphate particles to induce osteoconductivity. Mesenchymal stem cells (MSCs) were isolated from sheep inguinal and tail fat, in one group of sheep and scaffolds were infiltrated with MSCs in a bioreactor. Controls did not undergo surgery for cell extraction. Scaffolds were implanted into two experimental and two control adult sheep, and followed for either 3 or 6 months. Monthly radiographs and post explant micro-CT scanning demonstrated bone formation on the lateral, anterior, medial, and posterior-medial aspects along the entire length of the defect. Bone formation was absent on the posterior-lateral aspect where a muscle is generally attached to the bone. The 3-month time point showed 15.5% more cortical bone deposition around the scaffold circumference while the 6-month time point showed 40.9% more bone deposition within scaffold pores. Control sheep failed to unite. Serum collagen type-1C-terminus telopeptides (CTX-1) showed time-dependent levels of bone resorption, and calcein labeling demonstrated an increase in bone formation rate in treated animals compared with controls. © 2018 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 107B: 242-252, 2019.
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Affiliation(s)
- John A Szivek
- Orthopaedic Research Laboratory, Orthopaedic Surgery Department and Arizona Arthritis Center, University of Arizona, Arizona
| | - David A Gonzales
- Orthopaedic Research Laboratory, Orthopaedic Surgery Department and Arizona Arthritis Center, University of Arizona, Arizona
| | - Andrew M Wojtanowski
- Orthopaedic Research Laboratory, Orthopaedic Surgery Department and Arizona Arthritis Center, University of Arizona, Arizona
| | - Michael A Martinez
- Orthopaedic Research Laboratory, Orthopaedic Surgery Department and Arizona Arthritis Center, University of Arizona, Arizona
| | - Jordan L Smith
- Orthopaedic Research Laboratory, Orthopaedic Surgery Department and Arizona Arthritis Center, University of Arizona, Arizona
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Abd El Rahim SH, Melegy AA, Hamzawy EMA. Wollastonite-Pseudowollastonite from Silica Fume, Limestone and Glass Cullet Composite. INTERCERAM - INTERNATIONAL CERAMIC REVIEW 2017; 66:232-236. [DOI: 10.1007/bf03401217] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/02/2023]
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7
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Sin MC, Lin WL, Chang-Hung Chen J, Higuchi A, Zheng J, Chinnathambi A, Alharbi SA, Chang Y. Hemocompatible interface control via thermal-activated bio-inspired surface PEGylation. INT J POLYM MATER PO 2015. [DOI: 10.1080/00914037.2015.1129953] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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8
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Magenau AJD, Richards JA, Pasquinelli MA, Savin DA, Mathers RT. Systematic Insights from Medicinal Chemistry To Discern the Nature of Polymer Hydrophobicity. Macromolecules 2015. [DOI: 10.1021/acs.macromol.5b01758] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Andrew J. D. Magenau
- Materials
Science and Engineering, Drexel University, Philadelphia, Pennsylvania 19104, United States
| | - Jeffrey A. Richards
- Department
of Chemistry, Pennsylvania State University, New Kensington, Pennsylvania 15068, United States
| | - Melissa A. Pasquinelli
- Fiber
and Polymer Science Program, North Carolina State University, Raleigh, North Carolina 27695, United States
| | - Daniel A. Savin
- Department
of Chemistry, University of Florida, Gainesville, Florida 32611, United States
| | - Robert T. Mathers
- Department
of Chemistry, Pennsylvania State University, New Kensington, Pennsylvania 15068, United States
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Li Y, Xu B, Bai T, Liu W. Co-delivery of doxorubicin and tumor-suppressing p53 gene using a POSS-based star-shaped polymer for cancer therapy. Biomaterials 2015; 55:12-23. [PMID: 25934448 DOI: 10.1016/j.biomaterials.2015.03.034] [Citation(s) in RCA: 72] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2014] [Revised: 03/16/2015] [Accepted: 03/20/2015] [Indexed: 11/17/2022]
Abstract
In this work, a star-shaped polymer consisting of a cationic poly[2-(dimethylamino) ethyl methacrylate] (PDMAEMA) shell and a zwitterionic poly[N-(3-(methacryloylamino) propyl)-N,N-dimethyl-N-(3-sulfopropyl) ammonium hydroxide] (PMPD) corona was grafted from a polyhedral oligomeric silsesquioxanes (POSS)-based initiator via atomic transfer radical polymerization (ATRP). The reported star-shaped polymer could form stable micelles in aqueous solutions even in the presence of serum. In addition, anti-cancer drug doxorubicin and tumor-suppressing p53 gene were loaded in the process of micelle formation. The formed polyplex was biocompatible and highly efficient for both drug and gene delivery. Furthermore, the polyplex was able to cause a high apoptotic rate of tumor cells both in vitro and in vivo. This combination delivery strategy offers a promising method for cancer therapy and can be used for further clinical applications.
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Affiliation(s)
- Yongmao Li
- School of Materials Science and Engineering, Tianjin Key Laboratory of Composite and Functional Materials, Tianjin University, Tianjin 300072, PR China
| | - Bing Xu
- School of Materials Science and Engineering, Tianjin Key Laboratory of Composite and Functional Materials, Tianjin University, Tianjin 300072, PR China
| | - Tao Bai
- School of Materials Science and Engineering, Tianjin Key Laboratory of Composite and Functional Materials, Tianjin University, Tianjin 300072, PR China
| | - Wenguang Liu
- School of Materials Science and Engineering, Tianjin Key Laboratory of Composite and Functional Materials, Tianjin University, Tianjin 300072, PR China.
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10
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Gandhi R, Khatri N, Baradia D, Vhora I, Misra A. Surface-modified Epirubicin-HCl liposomes and its in vitro assessment in breast cancer cell-line: MCF-7. Drug Deliv 2015; 23:1152-62. [PMID: 25586675 DOI: 10.3109/10717544.2014.999960] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
BACKGROUND Epirubicin-HCl is highly efficient for breast cancer management at a concentration of 60-90 mg/m(2). However, its application is limited due to cumulative dose-dependent cardio-toxicity. PURPOSE The main aim of this study was to formulate breast cancer-targeted liposomal carrier by surface conjugation of transferrin to minimize cardio-toxicity of drug along with improved pharmacokinetic profile. METHOD Liposomes were formulated by ethanol injection method using HSPC, cholesterol and DSPG and later loaded with drug by the ammonium sulfate gradient method. The formulation was characterized for physicochemical properties like size, zeta potential, entrapment efficiency, TEM; in vitro tests like electro-flocculation, hemolysis and drug release; cell line study (MCF-7 cells); in vivo studies including LD50 determination, pharmacokinetic analysis, myocardial toxicity determination and stability. RESULTS AND DISCUSSION Optimized formulation had molar ratio of 60:30:8:2 (HSPC:Chol:DSPG:mPEG-DSPE) with entrapment efficiency ∼83%, particle size below 200 nm and zeta potential about -20 mV. In vitro studies proved non-interfering property and drug release character of formulation while cell line studies demonstrated improvement in cell uptake and thereby increased cytotoxicity of targeted formulation. The IC50 value obtained for epirubicin solution, non-targeted and targeted liposomes was 0.675, 0.532 and 0.192 µg/ml, respectively. Furthermore, in vivo tests validated safety and distribution profile of prepared formulations. CONCLUSION Apt properties of prepared Epirubicin-HCl liposomal formulation warrant its clinical application in breast cancer treatment after further studies.
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Affiliation(s)
- Ravi Gandhi
- a Pharmacy Department, Faculty of Technology and Engineering , The Maharaja Sayajirao University of Baroda , Vadodara , Gujarat , India
| | - Nirav Khatri
- a Pharmacy Department, Faculty of Technology and Engineering , The Maharaja Sayajirao University of Baroda , Vadodara , Gujarat , India
| | - Dipesh Baradia
- a Pharmacy Department, Faculty of Technology and Engineering , The Maharaja Sayajirao University of Baroda , Vadodara , Gujarat , India
| | - Imran Vhora
- a Pharmacy Department, Faculty of Technology and Engineering , The Maharaja Sayajirao University of Baroda , Vadodara , Gujarat , India
| | - Ambikanandan Misra
- a Pharmacy Department, Faculty of Technology and Engineering , The Maharaja Sayajirao University of Baroda , Vadodara , Gujarat , India
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11
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Cheng L, Li Y, Zhai X, Xu B, Cao Z, Liu W. Polycation-b-polyzwitterion copolymer grafted luminescent carbon dots as a multifunctional platform for serum-resistant gene delivery and bioimaging. ACS APPLIED MATERIALS & INTERFACES 2014; 6:20487-20497. [PMID: 25285670 DOI: 10.1021/am506076r] [Citation(s) in RCA: 80] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Nanomaterials that integrate functions of imaging and gene delivery have been of great interest due to their potential use in simultaneous diagnosis and therapy. Herein, polycation-b-polysulfobetaine block copolymer, poly[2-(dimethylamino) ethyl methacrylate]-b-poly[N-(3-(methacryloylamino) propyl)-N,N-dimethyl-N-(3-sulfopropyl) ammonium hydroxide] (PDMAEMA-b-PMPDSAH) grafted luminescent carbon dots (CDs) were prepared via surface-initiated atom transfer radical polymerization (ATRP) and investigated as a multifunctional gene delivery system (denoted as CD-PDMA-PMPD) in which the CD cores acted as good multicolor cell imaging probes, the cationic PDMAEMA acted as a DNA condensing agent, and the outer shell of zwitterionic PMPDSAH block protected the vector against nonspecific interactions with serum components. As revealed by the fluorescent spectrum study, the photoluminescent attributes, especially the tunable emission property, were well inherited from the parent CDs. The CD-PDMA-PMPD could condense plasmid DNA into nanospheres with sizes of approximate 50 nm at a proper complex ratio, posing little cytotoxicity at higher ratios. It was shown that the hybrid vector exhibited significantly suppressed BSA protein adsorption and superior hemocompatibility compared to those of the widely used PEI25k. In the in vitro transfection assay, an increased serum concentration from 10 to 50% caused a dramatic drop in PEI25k transfection performance, whereas the transfection efficiency of CD-PDMA-PMPD was well maintained; CD-PDMA80-PMPD40 showed 13 and 28 times higher transfection efficiencies than PEI25k at 30 and 50% serum concentration, respectively. Intriguingly, the carbon dots in the transfected cells displayed excitation-dependent fluorescent emissions, portending that this polycation-polyzwitterion modified CD will be a promising theranostic vector with excellent stealth performance.
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Affiliation(s)
- Lu Cheng
- School of Materials Science and Engineering, Tianjin Key Laboratory of Composite and Functional Materials, Tianjin University , Tianjin 300072, China
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12
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Wang Z, Macosko CW, Bates FS. Tuning surface properties of poly(butylene terephthalate) melt blown fibers by alkaline hydrolysis and fluorination. ACS APPLIED MATERIALS & INTERFACES 2014; 6:11640-11648. [PMID: 24967614 DOI: 10.1021/am502398u] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
The wetting properties of poly(butylene terephthalate) (PBT) melt blown fibers were tuned by alkaline hydrolysis and subsequent fluorination. Fiber mats were exposed to a NaOH methanol solution for controlled periods of time at several temperatures, resulting in surface hydrolysis (h-PBT). Subsequent simple solution chemistry was applied to the h-PBT fibers, leading to fluorination of the surface (f-PBT) and the transformation of the wetting properties of the material. Electron microscopy revealed that hydrolysis leads to a textured surface that is retained in the fluorinated product. Sessile drop wetting measurements demonstrated superhydrophilicity for the h-PBT fiber mats and sticky superhydrophobicity with the f-PBT fiber mat.
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Affiliation(s)
- Zaifei Wang
- Department of Chemical Engineering and Materials Science, University of Minnesota , Minneapolis, Minnesota 55455, United States
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13
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Sun J, Zeng F, Jian H, Wu S. Conjugation with Betaine: A Facile and Effective Approach to Significant Improvement of Gene Delivery Properties of PEI. Biomacromolecules 2013; 14:728-36. [DOI: 10.1021/bm301826m] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Jun Sun
- Department of Biomedical
Engineering, College of Materials Science and Engineering, South China University of Technology, Guangzhou 510640,
P. R. China
| | - Fang Zeng
- Department of Biomedical
Engineering, College of Materials Science and Engineering, South China University of Technology, Guangzhou 510640,
P. R. China
| | - Haoliang Jian
- Department of Biomedical
Engineering, College of Materials Science and Engineering, South China University of Technology, Guangzhou 510640,
P. R. China
| | - Shuizhu Wu
- State Key Laboratory
of Luminescent Materials and Devices, South China University of Technology, Guangzhou 510640, P.
R. China
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14
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Functionalization of titanium with chitosan via silanation: evaluation of biological and mechanical performances. PLoS One 2012; 7:e39367. [PMID: 22859940 PMCID: PMC3409222 DOI: 10.1371/journal.pone.0039367] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2012] [Accepted: 05/18/2012] [Indexed: 11/19/2022] Open
Abstract
Complications in dentistry and orthopaedic surgery are mainly induced by peri-implant bacterial infections and current implant devices do not prevent such infections. The coating of antibacterial molecules such as chitosan on its surface would give the implant bioactive properties. The major challenge of this type of coating is the attachment of chitosan to a metal substrate. In this study, we propose to investigate the functionalization of titanium with chitosan via a silanation. Firstly, the surface chemistry and mechanical properties of such coating were evaluated. We also verified if the coated chitosan retained its biocompatibility with the peri-implant cells, as well as its antibacterial properties. FTIR and Tof-SIMS analyses confirmed the presence of chitosan on the titanium surface. This coating showed great scratch resistance and was strongly adhesive to the substrate. These mechanical properties were consistent with an implantology application. The Chitosan-coated surfaces showed strong inhibition of Actinomyces naeslundii growth; they nonetheless showed a non significant inhibition against Porphyromonas gingivalis after 32 hours in liquid media. The chitosan-coating also demonstrated good biocompatibility to NIH3T3 fibroblasts. Thus this method of covalent coating provides a biocompatible material with improved bioactive properties. These results proved that covalent coating of chitosan has significant potential in biomedical device implantation.
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15
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Luo XH, Huang FW, Qin SY, Wang HF, Feng J, Zhang XZ, Zhuo RX. A strategy to improve serum-tolerant transfection activity of polycation vectors by surface hydroxylation. Biomaterials 2011; 32:9925-39. [DOI: 10.1016/j.biomaterials.2011.09.011] [Citation(s) in RCA: 81] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2011] [Accepted: 09/06/2011] [Indexed: 11/17/2022]
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Agrawal M, Sonetha VA, Sharma S, Parakh S, Dalvi B, Bellare JR. Evolution of a Novel Intraductal Patent Ductus Arteriosus Occlusion Device. J Med Device 2011. [DOI: 10.1115/1.4003674] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
Abstract
Persistence of the ductus arteriosus (DA) after birth leads to the congenital heart disease known as patent ductus arteriosus (PDA). The objective of this study is to develop an evaluation protocol and to propose a new and innovative intraductal design for a PDA occluder in order to conform to the varied morphology of the DA and to overcome the problems associated with devices relying on the anchorage mechanism. The new design, an assembly of 36 planar thermally treated Nitinol wires called Novel Device 36 (ND36), is in the shape of a frustum of a cone with a larger diameter of 12 mm, smaller diameter of 6 mm, and length of 11 mm. In-vitro biomimetic evaluations, namely, hemolysis tests and platelet adhesion studies, were conducted to ascertain the biocompatibility of the thermally treated Nitinol wires. These tests were also conducted on two different dimensions of Dacron fibers, which were to be sutured onto the device to induce thrombogenesis while in the duct, thereby facilitating better occlusion. Flow dynamics tests, which help simulate the dynamic conditions prevalent in the duct, were carried out on the ND36 and a commercially used PDA occlusion device. An analysis of the scanning electronic microscopy images showed no platelet adhesion on the Nitinol wires. The tested wires also showed nearly 0% hemolysis. Dacron fibers 0.2 mm thick and having an area density of 77 GSM proved to be best suited. Comparative analysis carried out with the commercially available Amplatzer duct occluder during the flow dynamics tests showed that the ND36 was capable of effectively occluding the duct as well as remaining stable under the dynamic conditions encountered in the duct. The ND36 has the potential to efficiently serve as a simplistic and cost effective alternative for PDA occlusion.
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Affiliation(s)
| | | | | | - Satyajeet Parakh
- Department of Chemical Engineering, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
| | - Bharat Dalvi
- Consultant Cardiologist Glenmark Cardiac Centre, 10 Nandadeep, 209 D, Doctor Ambedkar Road, Matunga (E), Mumbai 400019, India
| | - Jayesh R. Bellare
- Department of Chemical Engineering, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
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Buwalda SJ, Perez LB, Teixeira S, Calucci L, Forte C, Feijen J, Dijkstra PJ. Self-Assembly and Photo-Cross-Linking of Eight-Armed PEG-PTMC Star Block Copolymers. Biomacromolecules 2011; 12:2746-54. [DOI: 10.1021/bm200515h] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- Sytze J. Buwalda
- Department of Polymer Chemistry and Biomaterials, Faculty of Science and Technology, MIRA Institute for Biomedical Technology and Technical Medicine, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands
| | - Laura B. Perez
- Department of Polymer Chemistry and Biomaterials, Faculty of Science and Technology, MIRA Institute for Biomedical Technology and Technical Medicine, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands
| | - Sandra Teixeira
- Department of Polymer Chemistry and Biomaterials, Faculty of Science and Technology, MIRA Institute for Biomedical Technology and Technical Medicine, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands
| | - Lucia Calucci
- Istituto di Chimica dei Composti OrganoMetallici, CNR-Consiglio Nazionale delle Ricerche, Area della Ricerca di Pisa, via G. Moruzzi 1, 56124 Pisa, Italy
| | - Claudia Forte
- Istituto di Chimica dei Composti OrganoMetallici, CNR-Consiglio Nazionale delle Ricerche, Area della Ricerca di Pisa, via G. Moruzzi 1, 56124 Pisa, Italy
| | - Jan Feijen
- Department of Polymer Chemistry and Biomaterials, Faculty of Science and Technology, MIRA Institute for Biomedical Technology and Technical Medicine, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands
| | - Pieter J. Dijkstra
- Department of Polymer Chemistry and Biomaterials, Faculty of Science and Technology, MIRA Institute for Biomedical Technology and Technical Medicine, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands
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El-Sawy NM, Abd El-Rehim HA, Elbarbary AM. Radiation grafting of VAc/HEMA binary monomers onto PFA films for biomedical applications. ADVANCES IN POLYMER TECHNOLOGY 2011. [DOI: 10.1002/adv.20204] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Geffre CP, Margolis DS, Ruth JT, DeYoung DW, Tellis BC, Szivek JA. A novel biomimetic polymer scaffold design enhances bone ingrowth. J Biomed Mater Res A 2010; 91:795-805. [PMID: 19051300 DOI: 10.1002/jbm.a.32251] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
There has been recent interest in treating large bone defects with polymer scaffolds because current modalities such as autographs and allographs have limitations. Additionally, polymer scaffolds are utilized in tissue engineering applications to implant and anchor tissues in place, promoting integration with surrounding native tissue. In both applications, rapid and increased bone growth is crucial to the success of the implant. Recent studies have shown that mimicking native bone tissue morphology leads to increased osteoblastic phenotype and more rapid mineralization. The purpose of this study was to compare bone ingrowth into polymer scaffolds created with a biomimetic porous architecture to those with a simple porous design. The biomimetic architecture was designed from the inverse structure of native trabecular bone and manufactured using solid free form fabrication. Histology and muCT analysis demonstrated a 500-600% increase in bone growth into and adjacent to the biomimetic scaffold at five months post-op. This is in agreement with previous studies in which biomimetic approaches accelerated bone formation. It also supports the applicability of polymer scaffolds for the treatment of large tissue defects when implanting tissue-engineering constructs. (c) 2008 Wiley Periodicals, Inc. J Biomed Mater Res, 2009.
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Affiliation(s)
- Chris P Geffre
- Department of Orthopaedic Surgery, Orthopaedic Research Laboratory, University of Arizona, Tucson, Arizona, USA.
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Sharma S, Soni VP, Bellare JR. Chitosan reinforced apatite-wollastonite coating by electrophoretic deposition on titanium implants. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2009; 20:1427-1436. [PMID: 19253015 DOI: 10.1007/s10856-009-3712-6] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/01/2008] [Accepted: 02/06/2009] [Indexed: 05/27/2023]
Abstract
A novel bioactive porous apatite-wollastonite/chitosan composite coating was prepared by electrophoretic deposition. The influence of synthesis parameters like pH of suspension and current density was studied and optimized. X-ray diffraction confirmed crystalline phase of apatite-wollastonite in powder as well as composite coating with coat crystallinity of 65%. Scanning electron microscope showed that the porosity had interconnections with good homogeneity between the phases. The addition of chitosan increased the adhesive strength of the composite coating. Young's modulus of the coating was found to be 9.23 GPa. One of our key findings was sheet-like apatite growth unlike ball-like growth found in bioceramics. Role of chitosan was studied in apatite growth mechanism in simulated body fluid. In presence of chitosan, dense negatively charged surface with homogenous nucleation was the primary factor for sheet-like evolution of apatite layer. The results suggest that incorporation of chitosan with apatite-wollastonite in composite coating could provide excellent in vitro bioactivity with enhanced mechanical properties.
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Affiliation(s)
- Smriti Sharma
- School of Biosciences and Bioengineering, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
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Rodríguez-Lorenzo LM, García-Carrodeguas R, Rodríguez MA, De Aza S, Jiménez J, López-Bravo A, Fernandez M, Román JS. Synthesis, characterization, bioactivity and biocompatibility of nanostructured materials based on the wollastonite-poly(ethylmethacrylate-co-vinylpyrrolidone) system. J Biomed Mater Res A 2009; 88:53-64. [DOI: 10.1002/jbm.a.31867] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Chouzouri G, Xanthos M. In vitro bioactivity and degradation of polycaprolactone composites containing silicate fillers. Acta Biomater 2007; 3:745-56. [PMID: 17392042 DOI: 10.1016/j.actbio.2007.01.005] [Citation(s) in RCA: 78] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2006] [Revised: 12/21/2006] [Accepted: 01/10/2007] [Indexed: 11/16/2022]
Abstract
In spite of numerous publications on the potential use of combinations of polycaprolactone (PCL)/bioactive fillers for bone regeneration, little information exists on the assessment of solid, nonporous composites prepared via solventless routes and consisting of unmodified, slowly degrading homopolymer with relatively low amounts of reactive fillers such as bioglass or calcium silicate (CS). Thus, composites of PCL with commercial CS and a bioactive glass (BG45S5) at 30wt.% were produced by melt mixing in a twin screw extruder. Neat fillers, PCL and their composites were immersed in simulated body fluid (SBF) and phosphate buffer saline and tested for in vitro bioactivity and degradation, respectively, over a 4 month period. Testing methods included scanning electron microscopy with energy dispersive X-ray analysis, X-ray diffraction (XRD), elemental analysis and weight and pH changes before and after immersion. Experiments with neat fillers indicated fast growth of calcium phosphate minerals having different textures; they included clusters and globules of mineral precipitates as well as needle-shaped nanosized crystallites and possibly other calcium phosphate structures with varying Ca/P ratio. The bioactive glass composite initially showed fast growth of the precipitated minerals and partial surface coverage after 1 week, whereas in the CS composite, growth and surface coverage increased as a function of immersion time (over a period of 4 weeks) in the SBF solution. XRD results showed early appearance (1 week) of hydroxyapatite for both types of composites with differences attributed to different dissolution rates and different surface reactions of the fillers. Both fillers appeared to enhance the hydrolytic degradation of the matrix. Overall, the limited observed bioactivity of both composites within the test period may be related to the hydrophobicity of the matrix, insufficient ionic activity since SBF was not replenished and the relatively low content of the low surface areas fillers. Optimization of filler properties, such as surface/volume ratio, surface chemistry and size range, appears as a most important factor that would provide, at the required high filler volume fractions, a balance of melt processability and bioactivity.
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Affiliation(s)
- Georgia Chouzouri
- Otto H. York Department of Chemical Engineering, New Jersey Institute of Technology, Newark, NJ 07102, USA
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Szivek JA, Margolis DS, Garrison BK, Nelson E, Vaidyanathan RK, DeYoung DW. TGF-beta1-enhanced TCP-coated sensate scaffolds can detect bone bonding. J Biomed Mater Res B Appl Biomater 2005; 73:43-53. [PMID: 15682399 PMCID: PMC2288753 DOI: 10.1002/jbm.b.30177] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Porous polybutylene terephthalate (PBT) scaffold systems were tested as orthopedic implants to determine whether these scaffolds could be used to detect strain transfer following bone growth into the scaffold. Three types of scaffold systems were tested: porous PBT scaffolds, porous PBT scaffolds with a thin beta-tricalcium phosphate coating (LC-PBT), and porous PBT scaffolds with the TCP coating vacuum packed into the scaffold pores (VI-PBT). In addition, the effect of applying TGF-beta1 to scaffolds as an enhancement was examined. The scaffolds were placed onto the femora of rats and left in vivo for 4 months. The amount of bone ingrowth and the strain transfer through various scaffolds was evaluated by using scanning electron microscopy, histology, histomorphometry, and cantilever bend testing. The VI-PBT scaffold showed the highest and most consistent degree of mechanical interaction between bone and scaffold, providing strain transfers of 68.5% (+/-20.6) and 79.2% (+/-8.7) of control scaffolds in tension and compression, respectively. The strain transfer through the VI-PBT scaffold decreased to 29.1% (+/-24.3) and 30.4% (+/-25.8) in tension and compression when used with TGF-beta1. TGF-beta1 enhancement increased the strain transfer through LC-PBT scaffolds in compression from 9.4% (+/-8.7) to 49.7% (+/-31.0). The significant changes in mechanical strain transfer through LC-PBT and VI-PBT scaffolds correlated with changes in bone ingrowth fraction, which was increased by 39.6% in LC-PBT scaffolds and was decreased 21.3% in VI-PBT scaffolds after TGF-beta1 enhancement. Overall, the results indicate that strain transfer through TCP-coated PBT scaffolds correlate with bone ingrowth after implantation, making these instrumented scaffolds useful for monitoring bone growth by monitoring strain transfer.
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Affiliation(s)
- J A Szivek
- Orthopedic Research Laboratory, Department of Orthopedic Surgery, Arizona Arthritis Center, College of Medicine, University of Arizona, P.O. Box 245194, Tucson, Arizona 85724, USA.
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Wan X, Chang C, Mao D, Jiang L, Li M. Preparation and in vitro bioactivities of calcium silicate nanophase materials. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2005. [DOI: 10.1016/j.msec.2004.12.003] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Li X, Chang J. Synthesis of Wollastonite Single Crystal Nanowires by a Novel Hydrothermal Route. CHEM LETT 2004. [DOI: 10.1246/cl.2004.1458] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Introduction of photocrosslinkable chitosan to polyethylene film by radiation grafting and its blood compatibility. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2004. [DOI: 10.1016/j.msec.2003.09.168] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Risbud MV, Hambir S, Jog J, Bhonde R. Biocompatibility assessment of polytetrafluoroethylene/wollastonite composites using endothelial cells and macrophages. JOURNAL OF BIOMATERIALS SCIENCE. POLYMER EDITION 2002; 12:1177-89. [PMID: 11853385 DOI: 10.1163/156856201753395734] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
The aim of the study was to prepare a composite of polytetrafluoroethylene/wollastonite (PTFE/W) and evaluate its biocompatibility with endothelial cells. A composite of PTFE with wollastonite in the proportion 90/10 w/w was prepared. The dynamic storage modulus of composite is found to increase from 260 to about 453 MPa at room temperature while a marginal increase is observed in the compressive modulus. Higher values of storage modulus of PTFE/W relative to pristine PTFE over a range of temperature indicated the contribution of wollastonite in improving the rigidity of PTFE. Electron microscopic visualization of composite surface indicates suitable morphology for cell growth with the cross-section showing no evidence of bonding between PTFE and wollastonite. The water contact angle of the composite indicates increased hydrophilicity over native PTFE due to the presence of wollastonite. A direct-contact test did not show any deleterious effects on endothelial cell morphology and viability, indicating its compatibility. Leached-out products (LOP) from the composite were determined to be non-toxic as tested by tetrazolium (MTT) and Neutral red uptake (NRU) assays. Mouse peritoneal macrophages cultured in the presence of the composites did not show upregulation of activation markers such as CD11b/CD 18 (Mac-1), CD45, CD 14, and CD86 (B7.2) in comparison to macrophages cultured in contact with PTFE alone, indicating its non-activating nature. LOP did not induce proliferation of mouse splenic lymphocytes suggesting its immuno-tolerance. In static incubation assay contact with composite did not lead to hemolysis thus exhibiting preliminary hemocompatibility of the material. Suitable physico-chemical properties and well tolerance by endothelial cells and macrophages make this composite a prospective biomaterial. One could foresee the applications of this composite in areas where materials need to possess high rigidity and are subject to elevated temperatures.
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Affiliation(s)
- M V Risbud
- Tissue Engineering and Banking Laboratory, National Centre for Cell Science, Ganeshkhind, Pune, India.
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Risbud MV, Bhonde MR, Bhonde RR. Effect of chitosan-polyvinyl pyrrolidone hydrogel on proliferation and cytokine expression of endothelial cells: implications in islet immunoisolation. JOURNAL OF BIOMEDICAL MATERIALS RESEARCH 2001; 57:300-5. [PMID: 11484194 DOI: 10.1002/1097-4636(200111)57:2<300::aid-jbm1171>3.0.co;2-q] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Earlier we have shown the suitability of chitosan-polyvinyl pyrrolidone (PVP) hydrogel for islet immunoisolation and its inability to activate macrophages. Biomaterials that support vascularization without activating immune competent endothelial cells are desirous in islet immunoisolation. The aim of the present study was to evaluate effect of chitosan-PVP hydrogel on proliferation and activation of endothelial cells. Hydrogel did not allow the majority of cells to adhere well but maintained their viability. Hydrogel leachouts were nontoxic to the cells, as confirmed by tetrazolium reduction (MTT) and Neutral red uptake assays. Exposure to leachouts also did not alter their functionality as seen from normal expression of von Willebrand factor. 3H-thymidine incorporation revealed that hydrogel leachouts did not induce endothelial cell proliferation. Cells cultured on hydrogel and polystyrene control showed comparable expression of interleukin (IL) 6, IL-10, and transforming growth factor beta, with higher expression of tumor necrosis factor alpha as determined by reverse transcription-polymerase chain reaction. Taken together these results point out that hydrogel is compatible with endothelial cells and maintains their nonactivated status and hence is suitable as immunoisolation matrix.
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Affiliation(s)
- M V Risbud
- Tissue Engineering and Banking Laboratory, National Centre for Cell Science, Ganeshkhind, Pune 411 007, India.
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