101
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Removing human immunodeficiency virus (HIV) from human blood using immobilized heparin. Biotechnol Lett 2011; 34:853-6. [DOI: 10.1007/s10529-011-0840-0] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2011] [Accepted: 12/19/2011] [Indexed: 10/14/2022]
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102
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Sun H, Wang X, Hu X, Yu W, You C, Hu H, Han C. Promotion of angiogenesis by sustained release of rhGM-CSF from heparinized collagen/chitosan scaffolds. J Biomed Mater Res B Appl Biomater 2011; 100:788-98. [PMID: 22190418 DOI: 10.1002/jbm.b.32512] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2011] [Revised: 10/19/2011] [Accepted: 10/31/2011] [Indexed: 11/09/2022]
Abstract
A novel dermal substitute of combining recombinant human granulocyte-macrophage colony-stimulating factor (rhGM-CSF) with a porous heparinized collagen/chitosan scaffolds was developed, considering the inadequate angiogenesis during repair of full-thickness skin defects. The physicochemical properties of heparinized collagen/chitosan scaffolds were examined and in vitro release pattern of rhGM-CSF from scaffolds was measured by ELISA. Four groups of composite scaffolds (heparinized or unheparinized scaffolds loaded with or without rhGM-CSF) were fabricated for subcutaneous implantation in young adult male Sprague-Dawley (SD) rats. Tissue specimens were harvested at different time points after implantation for histopathological, immunohistochemical observation, and Western blotting analysis. The heparinized scaffolds (H(1)E) showed slower biodegradation and sustained release of rhGM-CSF in vitro, although no significantly different release pattern was observed between the H(1)E and unheparinized scaffolds (H(0)E). In vivo investigation revealed that the heparinized scaffolds loaded with rhGM-CSF (H(1)E/rhGM-CSF) had the best cellular adhesion and migration, new vessel formation, and highest expression of VEGF and TGF-β1, indicating promoted angiogenesis. This study demonstrated that composite dermal substitute of combining rhGM-CSF with a porous heparinized collagen/chitosan scaffolds could be a potential therapeutic agent for full-thickness skin defects because of its sustained delivery of rhGM-CSF.
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Affiliation(s)
- Huafeng Sun
- Department of Burns, Second Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou, China
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103
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An in vitro evaluation of inflammation response of titanium functionalized with heparin/fibronectin complex. Cytokine 2011; 56:208-17. [DOI: 10.1016/j.cyto.2011.06.020] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2010] [Revised: 05/31/2011] [Accepted: 06/27/2011] [Indexed: 01/17/2023]
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104
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Wang H, Feng Y, Zhao H, Lu J, Guo J, Behl M, Lendlein A. controlled heparin release from electrospun gelatin fibers. J Control Release 2011; 152 Suppl 1:e28-9. [DOI: 10.1016/j.jconrel.2011.08.102] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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105
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Liu Y, Acharya G, Lee CH. Effects of dialdehyde starch on calcification of collagen matrix. J Biomed Mater Res A 2011; 99:485-92. [DOI: 10.1002/jbm.a.33209] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2011] [Revised: 06/09/2011] [Accepted: 06/14/2011] [Indexed: 11/08/2022]
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106
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Nguyen DH, Joung YK, Choi JH, Moon HT, Park KD. Targeting ligand-functionalized and redox-sensitive heparin-Pluronic nanogels for intracellular protein delivery. Biomed Mater 2011; 6:055004. [PMID: 21849723 DOI: 10.1088/1748-6041/6/5/055004] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
The heparin-Pluronic (HP) conjugate was coupled via redox-sensitive disulfide bond and contains a vinyl sulfone (VS) group with high reactivity to some functional groups such as thiol group. Heparin was conjugated with cystamine and the terminal hydroxyl groups of Pluronic were activated with the VS group, followed by coupling of VS groups of Pluronic with cystamine of heparin. The chemical structure, heparin content and VS group content of the resulting product were determined by (1)H NMR, FT-IR, toluidine blue assay and Ellman's method. The HP conjugate formed a type of nanogel in an aqueous medium, showing a critical micelle concentration of approximately 129.35 mg L(-1), a spherical shape and the mean diameter of 115.7 nm, which were measured by AFM and DLS. The release test demonstrated that HP nanogel was rapidly degraded when treated with glutathione. Cytotoxicity results showed a higher viability of drug-free HP nanogel than that of drug-loaded one. Cyclo(Arg-Gly-Asp-D-Phe-Cys) (cRGDfC) peptide was efficiently conjugated to VS groups of HP nanogel and exhibited higher cellular uptake than unmodified nanogels. All results suggest a novel multi-functional nanocarrier delivery and effective release of proteins to the intracellular region in a redox-sensitive manner.
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Affiliation(s)
- Dai Hai Nguyen
- Department of Molecular Science and Technology, Ajou University, Yeoungtong, Suwon, Korea
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107
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Biomimetic Hemocompatible Nanofibrous Scaffolds as Potential Small-Diameter Blood Vessels by Bilayering Electrospun Technique. ACTA ACUST UNITED AC 2011. [DOI: 10.4028/www.scientific.net/amr.306-307.1627] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In this paper, we prepared a scaffold composed of a polyurethane (PU) fibrous outside-layer and a gelatin-heparin fibrous inner-layer with mimicking morphology and mechanical properties of a native blood vessel by sequential bilayering electrospinning technology on a rotating mandrel-type collector. The scaffolds achieved the appropriate breaking strength (3.7 ± 0.13 MPa) and elongation at break (110 ± 8%). When the scaffolds were immersed in water for 1 h, the breaking strength decreased slightly to 2.2 ± 0.3 MPa, but the elongation at break increased up to 145 ± 21%. Heparin was released from the scaffolds at substantially uniform rate until the 9th day. The scaffolds were expected to mimic the complex matrix structure of native arteries, and had good hemocompatibility as an artificial blood vessel owing to the heparin release.
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108
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Creating growth factor gradients in three dimensional porous matrix by centrifugation and surface immobilization. Biomaterials 2011; 32:8254-60. [PMID: 21798593 DOI: 10.1016/j.biomaterials.2011.07.027] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2011] [Accepted: 07/08/2011] [Indexed: 01/13/2023]
Abstract
Polycaprolactone (PCL)/Pluronic F127 cylindrical scaffolds with gradually increasing growth factor concentrations were fabricated by the centrifugation of fibril-like PCLs and the subsequent fibril surface immobilization of growth factors. The cylindrical scaffolds exhibited gradually increasing surface areas along the longitudinal direction [from 3.17 ± 0.05 m(2)/g (top position) to 5.42 ± 0.01 m(2)/g (bottom position)]. The growth factors (BMP-7, TGF-β(2) and VEGF(165)) as model bioactive molecules were immobilized onto the fibril surfaces of the scaffolds via heparin binding to produce scaffolds with gradually increasing concentrations of growth factors from the top position (BMP-7, 60.89 ± 2.51; TGF-β(2), 42.85 ± 2.00; VEGF(165), 42.52 ± 3.22 ng/scaffold section) to the bottom position (BMP-7, 181.07 ± 3.21; TGF-β(2), 142.08 ± 2.91; VEGF(165), 112.00 ± 4.00 ng/scaffold section). The released amount of growth factor (VEGF(165)) from the cylindrical scaffold gradually decreased along the longitudinal direction in a sustained manner for up to 35 days, which can allow for a minutely controlled spatial distribution of growth factors in a 3D environment. The 3D porous scaffold with a concentration gradient of growth factors may become a useful tool for basic studies, including in vitro investigations of 3D chemotaxis/haptotaxis for the control of specific biological process. It may also be used as a tissue engineering scaffolding system for a variety of tissues/organs requiring the spatial regulation of growth factors for effective regeneration.
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109
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Hemocompatible polyurethane/gelatin-heparin nanofibrous scaffolds formed by a bi-layer electrospinning technique as potential artificial blood vessels. Front Chem Sci Eng 2011. [DOI: 10.1007/s11705-011-1202-0] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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110
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Dai Hai Nguyen, Jong Hoon Choi, Yoon Ki Joung, Ki Dong Park. Disulfide-crosslinked heparin-pluronic nanogels as a redox-sensitive nanocarrier for intracellular protein delivery. J BIOACT COMPAT POL 2011. [DOI: 10.1177/0883911511406031] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Improving the efficacy of drug delivery via nanocarriers has been a major issue in the field of intravenous delivery. In this study, a polymeric nanogel was developed to enhance the stability, redox responsiveness, and the efficacy for intracellular protein delivery. The thiolated heparin-Pluronic conjugate was self-assembled and oxidized to form a disulfide-crosslinked nanogel network under a diluted aqueous condition. The disulfide-crosslinked heparin-Pluronic (DHP) nanogels with encapsulated RNase A were characterized by in vitro release and cytotoxicity tests depending on the existence of glutathione (GSH). The DHP nanogels exhibited reduced hydrodynamic size, higher encapsulation degree, and augmentable release responding to the GSH concentration. The ctotoxicity data confirmed that DHP nanogels were more effective for the intracellular delivery of RNase A compared to non-crosslinked nanogel.
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Affiliation(s)
- Dai Hai Nguyen
- Department of Molecular Science and Technology, Ajou University, 5 Woncheon, Yeoungtong, Suwon 443-749, Republic of Korea
| | - Jong Hoon Choi
- Department of Molecular Science and Technology, Ajou University, 5 Woncheon, Yeoungtong, Suwon 443 749, Republic of Korea
| | - Yoon Ki Joung
- Department of Molecular Science and Technology, Ajou University, 5 Woncheon, Yeoungtong, Suwon 443-749, Republic of Korea
| | - Ki Dong Park
- Department of Molecular Science and Technology, Ajou University, 5 Woncheon, Yeoungtong, Suwon 443-749, Republic of Korea,
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111
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112
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Li G, Yang P, Liao Y, Huang N. Tailoring of the Titanium Surface by Immobilization of Heparin/Fibronectin Complexes for Improving Blood Compatibility and Endothelialization: An in Vitro Study. Biomacromolecules 2011; 12:1155-68. [DOI: 10.1021/bm101468v] [Citation(s) in RCA: 79] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Guicai Li
- Institute of Biomaterials and Surface Engineering, Key Laboratory for Advanced Technologies of Materials, Ministry of Education, Southwest Jiaotong University, Chengdu 610031, P.R. China
| | - Ping Yang
- Institute of Biomaterials and Surface Engineering, Key Laboratory for Advanced Technologies of Materials, Ministry of Education, Southwest Jiaotong University, Chengdu 610031, P.R. China
| | - Yuzhen Liao
- Institute of Biomaterials and Surface Engineering, Key Laboratory for Advanced Technologies of Materials, Ministry of Education, Southwest Jiaotong University, Chengdu 610031, P.R. China
| | - Nan Huang
- Institute of Biomaterials and Surface Engineering, Key Laboratory for Advanced Technologies of Materials, Ministry of Education, Southwest Jiaotong University, Chengdu 610031, P.R. China
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113
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Ma KW, Dai XZ, Feng SY, Jing AH, Yang JY. Heparinized polyvinyl alcohol to specifically adsorb low-density lipoprotein from plasma. Transfus Apher Sci 2011; 44:3-9. [DOI: 10.1016/j.transci.2010.12.001] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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114
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Ponedel’kina IY, Lukina ES, Odinokov VN. Acid glycosaminoglycans and their chemical modification. RUSSIAN JOURNAL OF BIOORGANIC CHEMISTRY 2011. [DOI: 10.1134/s1068162008010019] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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115
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Oh SH, Kim IG, Lee JY, Lee JY, Lee JH. Bioactive porous beads as an injectable urethral bulking agent: their in vitro evaluation on smooth muscle cell differentiation. Tissue Eng Part A 2010; 17:655-64. [PMID: 20919951 DOI: 10.1089/ten.tea.2010.0430] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Growth factor (basic fibroblast growth factor or vascular endothelial growth factor)-immobilized polycaprolactone (PCL)/Pluronic F127 porous beads were prepared as an injectable bulking agent for effective treatment of urinary incontinence. The growth factor-immobilized porous beads may stimulate smooth muscle cell (SMC) differentiation of muscle-derived stem cells or defect tissues around urethra to improve the sphincter function (bioactive therapy) as well as to provide a bulking effect (passive therapy). The porous PCL/F127 beads were fabricated by an isolated particle-melting/melt-molding particulate-leaching method. The growth factors were easily immobilized onto the surfaces of the PCL/F127 porous beads via heparin binding and were continuously released for up to 28 days. Both growth factor-immobilized porous beads had a positive effect for the SMC differentiation of muscle-derived stem cells, as were demonstrated by the analyses of quantitative polymerase chain reactions, Western blot using SMC-specific markers, and immunohistochemical staining. In particular, the basic fibroblast growth factor-immobilized porous beads showed desirable SMC differentiation behavior that can be applied as an injectable bulking agent for the treatment of urinary incontinence.
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Affiliation(s)
- Se Heang Oh
- Department of Advanced Materials, Hannam University, Yuseong Gu, Daejeon, South Korea
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116
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Coimmobilization of heparin/fibronectin mixture on titanium surfaces and their blood compatibility. Colloids Surf B Biointerfaces 2010; 81:255-62. [DOI: 10.1016/j.colsurfb.2010.07.016] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2010] [Revised: 05/20/2010] [Accepted: 07/07/2010] [Indexed: 11/24/2022]
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117
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Tian JL, Zhao YZ, Jin Z, Lu CT, Tang QQ, Xiang Q, Sun CZ, Zhang L, Xu YY, Gao HS, Zhou ZC, Li XK, Zhang Y. Synthesis and characterization of Poloxamer 188-grafted heparin copolymer. Drug Dev Ind Pharm 2010; 36:832-8. [PMID: 20515404 DOI: 10.3109/03639040903520983] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
BACKGROUND Poloxamer 188 is a safe biocompatible polymer that can be used in protein drug delivery system. AIM In this study, a new heparin-poloxamer 188 conjugate (HP) was synthesized and its physicochemical properties were investigated. HP structure was confirmed by Fourier transform infrared spectroscopy (FTIR) and Hydrogen-1 nuclear magnetic resonance spectroscopy ((1)H-NMR). Content of the conjugated heparin was analyzed using Toluidine Blue. The critical micelle concentration (CMC) of the copolymer was determined by a fluorescence probe technique. The effect of HP on the gelation of poloxamer 188 was characterized by the rheological properties of the HP-poloxamer hydrogels. Solubility and viscosity of HP were also evaluated compared with poloxamer 188. RESULTS From the results, the solubility of the conjugated heparin was increased compared with free heparin. The content of heparin in HP copolymer was 62.9%. The CMC of HP and poloxamer 188 were 0.483 and 0.743 mg/mL, respectively. The gelation temperature of 0.4 g/mL HP was 43.5 degrees C, whereas that of the same concentration of poloxamer 188 was 37.3 degrees C. With HP content in poloxamer 188 solution increasing, a V-shape change of gelation temperature was observed. CONCLUSION Considering the importance of poloxamer 188 in functional material, HP may prove to be a facile temperature-sensitive material for protein drug-targeted therapy.
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Affiliation(s)
- Ji-Lai Tian
- Pharmacy School, Wenzhou Medical College, Wenzhou, Zhejiang Province, PR China
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118
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Lakshmi TSR, Shanmugasundaram N, Shanmuganathan S, Karthikeyan K, Meenakshi J, Babu M. Controlled release of 2, 3 desulfated heparin exerts its anti-inflammatory activity by effectively inhibiting E-selectin. J Biomed Mater Res A 2010; 95:118-28. [DOI: 10.1002/jbm.a.32791] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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119
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Synthesis and evaluation of heparin immobilized “side-on” to polystyrene microspheres coated with end-group activated polyethylene oxide. Int J Biol Macromol 2010; 47:98-103. [DOI: 10.1016/j.ijbiomac.2010.05.015] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2010] [Revised: 04/30/2010] [Accepted: 05/20/2010] [Indexed: 11/17/2022]
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120
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Liao D, Wang X, Lin PH, Yao Q, Chen C. Covalent linkage of heparin provides a stable anti-coagulation surface of decellularized porcine arteries. J Cell Mol Med 2010; 13:2736-2743. [PMID: 19040421 DOI: 10.1111/j.1582-4934.2008.00589.x] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
Abstract
Establishing thrombosis-resistant surface is crucial to develop tissue-engineered small diameter vascular grafts for arterial reconstructive procedures. The objective of this study was to evaluate the stability and anti-coagulation properties of heparin covalently linked to decellularized porcine carotid arteries. Cellular components of porcine carotid arteries were completely removed with chemical and physical means. Heparin was covalently linked to the decellularized vessels by a chemical reaction of the carboxyl end of amino acids with hydroxylamine sulphate salt and heparin-EDC. Bound heparin contents were measured by quantitative colorimetric assay of toluidine blue staining. The average content of heparin in treated vessels was 35.6 +/- 11.6 mg/cm(2) tissue, which represented 6.21 +/- 2.03 UPS heparin/cm(2) tissue. The stability of heparin linkage was tested by incubating the heparin-linked vessels either in PBS at 37 degrees C or in 70% alcohol at room temperature up to 21 days, showing no significant reduction of heparin content. Anti-coagulation property of bound heparin was determined with a clotting time assay using fresh dog blood. Standardized small pieces of non-heparin-bound vessels were clotted in fresh dog blood within 10 min., whereas all heparin-bound vessels did not form clot during 1-hr observation. In vivo platelet deposition of the vessel was determined with a baboon model of the femoral arteriovenous external shunt and (111)Indium labelling of platelets. There were 1.38 +/- 0.07 x 10(9) and 0.64 +/- 0.11 x 10(9) baboon platelets deposited on the control and heparin-linked vessels, respectively, at 60 min. These data demonstrate that covalent linkage of heparin provides an effective and stable anti-coagulation surface of decellularized porcine carotid arteries. This study may suggest a new strategy to develop tissue-engineered biological vascular grafts, which could be used for human coronary or low extremity artery bypasses.
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Affiliation(s)
- Dan Liao
- Molecular Surgeon Research Center, Division of Vascular Surgery and Endovascular Therapy, Michael E. DeBakey Department of Surgery, Baylor College of Medicine, and Michael E. DeBakey VA Medical Center, Houston, TX, USA
| | - Xinwen Wang
- Molecular Surgeon Research Center, Division of Vascular Surgery and Endovascular Therapy, Michael E. DeBakey Department of Surgery, Baylor College of Medicine, and Michael E. DeBakey VA Medical Center, Houston, TX, USA
| | - Peter H Lin
- Molecular Surgeon Research Center, Division of Vascular Surgery and Endovascular Therapy, Michael E. DeBakey Department of Surgery, Baylor College of Medicine, and Michael E. DeBakey VA Medical Center, Houston, TX, USA
| | - Qizhi Yao
- Molecular Surgeon Research Center, Division of Vascular Surgery and Endovascular Therapy, Michael E. DeBakey Department of Surgery, Baylor College of Medicine, and Michael E. DeBakey VA Medical Center, Houston, TX, USA
| | - Changyi Chen
- Molecular Surgeon Research Center, Division of Vascular Surgery and Endovascular Therapy, Michael E. DeBakey Department of Surgery, Baylor College of Medicine, and Michael E. DeBakey VA Medical Center, Houston, TX, USA
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121
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Preparation of macroporous monoliths based on epoxy-bearing hydrophilic terpolymers and applied for affinity separations. Eur Polym J 2010. [DOI: 10.1016/j.eurpolymj.2010.01.009] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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122
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Li L, Huh KM, Lee YK, Kim SY. Design of a multifunctional heparin-based nanoparticle system for anticancer drug delivery. Macromol Res 2010. [DOI: 10.1007/s13233-009-0134-8] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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123
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Chen MC, Wong HS, Lin KJ, Chen HL, Wey SP, Sonaje K, Lin YH, Chu CY, Sung HW. The characteristics, biodistribution and bioavailability of a chitosan-based nanoparticulate system for the oral delivery of heparin. Biomaterials 2009; 30:6629-37. [DOI: 10.1016/j.biomaterials.2009.08.030] [Citation(s) in RCA: 75] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2009] [Accepted: 08/09/2009] [Indexed: 10/20/2022]
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124
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Jin Woo Bae, Choi JH, Tae Eun Kim, Ki Dong Park, Ji Youn Kim, Yong Doo Park, Sun K. Heparinized Micropatterned Surfaces for the Spatial Control of Human Mesenchymal Stem Cells. J BIOACT COMPAT POL 2009. [DOI: 10.1177/0883911509349143] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
In this study, a heparinized micropattern surface was prepared for the spatial control of human mesenchymal stem cells (hMSCs) that can differentiate into the desired tissues. Poly(styrene-co-vinylbenzyl N,N-diethyl-dithiocarbamate) (poly(ST-co-VBDC)) was synthesized as a photoreactive polymer; poly(ethylene glycol) methacrylate (PEGMA) was polymerized on the poly(ST-co-VBDC) coated surface by UV irradiation. XPS spectra revealed the residual DC moieties on the PEGMA-grafted surface and the linear chain growth of PEGMA was monitored according to irradiation time. After chemical immobilization of heparin onto this PEGMA surface, surface micropatterning was carried out by additional photopolymerization of PEGMA using a photomask. After incubation for 4 hour, the hMSCs adhered to the heparinized surface, while the hydrophilic PEGMA surface demonstrated no cell adhesion even after basic fibroblast growth factor (bFGF) treatment. Good alignment of hMSCs on the pattern-surface was distinctly observed along micron-sized grooves due to the presence of both heparin and bFGF. This heparinized micropattern surface can be used to study in vitro hMSCs responses with various heparin-binding growth factors in tissue engineering fields as well as cellular array for the spatial control of hMSCs.
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Affiliation(s)
- Jin Woo Bae
- Department of Molecular Science and Technology, Ajou University 5 Woncheon, Yeongtong, Suwon 443-749, Republic of Korea
| | - Jong Hoon Choi
- Department of Molecular Science and Technology, Ajou University 5 Woncheon, Yeongtong, Suwon 443-749, Republic of Korea
| | - Tae Eun Kim
- Department of Molecular Science and Technology, Ajou University 5 Woncheon, Yeongtong, Suwon 443-749, Republic of Korea
| | - Ki Dong Park
- Department of Molecular Science and Technology, Ajou University 5 Woncheon, Yeongtong, Suwon 443-749, Republic of Korea,
| | - Ji Youn Kim
- Department of Biomedical Engineering Korea University Medical College, Seoul, Republic of Korea
| | - Yong Doo Park
- Department of Biomedical Engineering Korea University Medical College, Seoul, Republic of Korea
| | - Kyung Sun
- Department of Biomedical Engineering Korea University Medical College, Seoul, Republic of Korea
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125
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Mechanical properties, drug eluting characteristics and in vivo performance of a genipin-crosslinked chitosan polymeric stent. Biomaterials 2009; 30:5560-71. [DOI: 10.1016/j.biomaterials.2009.06.039] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2009] [Accepted: 06/19/2009] [Indexed: 11/24/2022]
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126
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Elimova E, Kisilevsky R, Ancsin JB. Heparan sulfate promotes the aggregation of HDL‐associated serum amyloid A: evidence for a proamyloidogenic histidine molecular switch. FASEB J 2009; 23:3436-48. [DOI: 10.1096/fj.09-134981] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Elena Elimova
- Department of Biochemistry Queen's University Kingston Ontario Canada
- Department of Medicine University of Ottawa Ottawa ON K1H 8L6 Canada
| | - Robert Kisilevsky
- Department of Biochemistry Queen's University Kingston Ontario Canada
- Department of Pathology and Molecular Medicine Queen's University Kingston Ontario Canada
- The Syl and Molly Apps Research Centre Kingston General Hospital Kingston Ontario Canada
| | - John B. Ancsin
- Department of Biochemistry Queen's University Kingston Ontario Canada
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127
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Huang L, Cheng X, Liu C, Xing K, Zhang J, Sun G, Li X, Chen X. Preparation, characterization, and antibacterial activity of oleic acid-grafted chitosan oligosaccharide nanoparticles. ACTA ACUST UNITED AC 2009. [DOI: 10.1007/s11515-009-0027-4] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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128
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Chen MC, Chang Y, Liu CT, Lai WY, Peng SF, Hung YW, Tsai HW, Sung HW. The characteristics and in vivo suppression of neointimal formation with sirolimus-eluting polymeric stents. Biomaterials 2009; 30:79-88. [DOI: 10.1016/j.biomaterials.2008.09.006] [Citation(s) in RCA: 60] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2008] [Accepted: 09/02/2008] [Indexed: 11/26/2022]
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129
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Ma KW, Ma L, Cai SX, Wang X, Liu B, Xu ZL, Dai XZ, Yang JY, Jing AH, Lei WJ. Preparation of heparin-immobilized PVA and its adsorption for low-density lipoprotein from hyperlipemia plasma. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2008; 19:3255-3261. [PMID: 18470702 DOI: 10.1007/s10856-008-3461-y] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/17/2007] [Accepted: 04/17/2008] [Indexed: 05/26/2023]
Abstract
In this study, heparin was covalently coupled by glutaraldehyde to Poly(vinyl alcohol) [PVA] in solid-liquid two-phase reaction system by two-step synthesis method to prepare a LDL-selective adsorbent. The parameters (the material ratio, reaction time and dosage of catalyzer) were investigated to evaluate their effect upon the immobilized amount of heparin onto the surface of PVA, IR was used to verify the covalent immobilization result and the heparin-modified PVA was also undergone the evaluation of its adsorption capability for low-density lipoprotein from hyperlipemia plasma, and its hemocompatibility was preliminarily evaluated by platelet adhesion test. Results showed: (1) under optimized reaction conditions the highest immobilization amount of heparin onto PVA surface within the experiments of this study has been obtained; (2) the optimized reaction conditions were: (i) at the refluxing temperature 78 degrees C; (ii) the material ratio of "PVA(g): 50% glutaraldehyde (ml)" was about "1:3"; (iii) the reaction time was about 5 h; and (iv) the amount of catalyzer (concentrated HCL) was about 1% of the 50% glutaraldehyde; (3) within the experiments of this study the highest immobilization amount would be up to 25 microg heparin on the surface of per g PVA granules; (4) the heparin-modified PVA granules showed significant adsorption for LDL under faintly alkaline environment (pH=7.2-9.5) ; (5) The result of platelet adhesion test showed no platelet adhered to its surface. Therefore, immobilization of heparin onto the surface of a support is one approach to prepare a kind of LDL adsorbent for blood purification.
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Affiliation(s)
- Kai-Wang Ma
- College of Medical Technology & Engineering, Henan University of Science and Technology, Luoyang 471003, People's Republic of China.
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130
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131
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Nihsen ES, Zopf DA, Ernst DMJ, Janis AD, Hiles MC, Johnson C. Absorption of bioactive molecules into OASIS wound matrix. Adv Skin Wound Care 2008; 20:541-8. [PMID: 17906428 DOI: 10.1097/01.asw.0000294756.97425.c9] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
OBJECTIVE To examine the ability of OASIS Wound Matrix to absorb, retain, and protect bioactive molecules from solution. DESIGN Samples of OASIS Wound Matrix were incubated in solutions of bioactive molecules, specifically heparin, albumin, fibronectin, basic fibroblast growth factor 2, and platelet-derived growth factor (PDGF). Half of the samples were then rinsed, and all of the samples were evaluated using enzyme-linked immunosorbent assays (ELISAs) and dye-mediated spectrophotometric methods for absorption and retention of the bioactive molecules. Protection of PDGF was measured by placing PDGF-incubated and control samples into a degradation solution containing plasmin. Intact PDGF levels were then evaluated using a PDGF-specific ELISA. MAIN OUTCOME MEASURES The main outcome measures were the amount of each bioactive molecule that was absorbed after incubation in solutions and retained after rinses as well as the amount of PDGF remaining after plasmin degradation. MAIN RESULTS OASIS Wound Matrix absorbed bioactive molecules from solution, selectively absorbed PDGF from serum, and protected PDGF from protease degradation. CONCLUSIONS Although OASIS Wound Matrix potentially has multiple functions in wound healing, it likely promotes wound healing, in part, by absorbing, retaining, and protecting bioactive molecules from the wound environment.
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132
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Kondo SI, Fukunaga Y, Oikawa M, Sasai Y, Kuzuya M. Plasma-Assisted Immobilization of Heparin onto Low-Density Polyethylene Surface. Chem Pharm Bull (Tokyo) 2008; 56:921-5. [DOI: 10.1248/cpb.56.921] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Affiliation(s)
- Shin-ichi Kondo
- Laboratory of Pharmaceutical Physical Chemistry, Gifu Pharmaceutical University
| | - Yasuyo Fukunaga
- Laboratory of Pharmaceutical Physical Chemistry, Gifu Pharmaceutical University
| | - Michinori Oikawa
- Laboratory of Pharmaceutical Physical Chemistry, Gifu Pharmaceutical University
| | - Yasushi Sasai
- Laboratory of Pharmaceutical Physical Chemistry, Gifu Pharmaceutical University
| | - Masayuki Kuzuya
- Department of Pharmaceutical Physical Chemistry, Faculty of Pharmaceutical Science, Matsuyama University
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133
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Tebbe D, Thull R, Gbureck U. Correlation between heparin release and polymerization degree of organically modified silica xerogels from 3-methacryloxypropylpolysilsesquioxane. Acta Biomater 2007; 3:829-37. [PMID: 17586106 DOI: 10.1016/j.actbio.2007.05.002] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2006] [Revised: 04/02/2007] [Accepted: 05/02/2007] [Indexed: 11/24/2022]
Abstract
This work aimed to investigate the use of an organically modified porous silica matrix (poly(methacryloxypropyl)-poly(silsesquioxane); P-MA-PS) as a release system for heparin. The matrices were obtained from methacryloxypropyltrimethoxysilane (MAS) via the sol-gel process under acidic conditions following photochemical polymerization and cross-linking of the organic matrix. Modulation of the polymerization degree of the organic matrix in the range 0-71% allowed adjusting the release kinetics of heparin according to therapeutic needs. It was demonstrated that higher drug loads and a decreasing polymerization degree resulted in a faster release profile of heparin, which followed a square root of time kinetic according to the Higuchi model. The hydrolytic degradation of hybrid xerogel was found to follow a zero-order kinetic whereas the heparin concentration did not show an influence on the degradation rate of the matrix. Since the released heparin retained its biological activity, the P-MA-PS matrices are of clinically interest, e.g. as coating on drug eluting coronary stents.
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Affiliation(s)
- David Tebbe
- Department for Functional Materials in Medicine and Dentistry, University of Würzburg, Pleicherwall 2, D-97070 Würzburg, Germany
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134
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Cui C, Schwendeman SP. One-step surface modification of poly(lactide-co-glycolide) microparticles with heparin. Pharm Res 2007; 24:2381-93. [PMID: 17710516 DOI: 10.1007/s11095-007-9378-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2007] [Accepted: 06/13/2007] [Indexed: 10/22/2022]
Abstract
PURPOSE The aim of this study was to modify the surface of poly(lactide-co-glycolide) (PLGA) microparticles with heparin. The heparin-coated PLGA may enhance blood and tissue compatibility of PLGA devices and provide a novel approach to deliver growth factors. MATERIALS AND METHODS A one-step method using heparin to replace traditional emulsifiers (e.g., PVA) during emulsion-solvent evaporation process was employed to surface-entrap heparin in PLGA microspheres. The emulsifying activity of heparin was modified via varying counter ion form, including univalent (Na(+), K(+), Li(+), and [Formula: see text]) and divalent (Ca(2+), Mg(2+), Ba(2+), and Zn(2+)) cations, and complexation with amino acids (Arg, Lys, Leu, Val, Gly and Glu). Surface accessible and total heparin loading were determined by a modified toluidine blue assay and elemental analysis, respectively. RESULTS Heparin bound with univalent counter ions and amino acids exhibited emulsifying activity to varying degrees, whereas divalent heparin salts tended to cause complete aggregation of the PLGA o/w emulsion. Increasing pH (>or=7.4) of hardening medium enhanced heparin adsorption and significantly stabilized the PLGA o/w emulsion. The initial surface density of heparin on the PLGA microspheres prepared using univalent heparin salts was around 8-33 mg/m(2). Surface associated heparin desorbed quickly; potassium heparin showed the best retention, with approximately 0.2 and 0.1 mg/m(2) detected on PLGA microsphere surface following 1- and 14-day incubation in PBST at 37 degrees C, respectively. CONCLUSIONS PLGA microparticles were successfully surface-modified with heparin. Univalent salts and amino acid complexes of heparin, as effective emulsifiers, can become surface-immobilized in PLGA microspheres.
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Affiliation(s)
- Chengji Cui
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Michigan, 428 Church Street, Ann Arbor, Michigan, 48109-1065, USA
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135
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Tebbe D, Thull R, Gbureck U. Influence of spacer length on heparin coupling efficiency and fibrinogen adsorption of modified titanium surfaces. Biomed Eng Online 2007; 6:31. [PMID: 17640335 PMCID: PMC1950714 DOI: 10.1186/1475-925x-6-31] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2007] [Accepted: 07/17/2007] [Indexed: 11/24/2022] Open
Abstract
Background Chemical bonding of the drug onto surfaces by means of spacer molecules is accompanied with a reduction of the biological activity of the drug due to a constricted mobility since normally only short spacer molecule like aminopropyltrimethoxysilane (APMS) are used for drug coupling. This work aimed to study covalent attachment of heparin to titanium(oxide) surfaces by varying the length of the silane coupling agent, which should affect the biological potency of the drug due to a higher mobility with longer spacer chains. Methods Covalent attachment of heparin to titanium metal and TiO2 powder was carried out using the coupling agents 3-(Trimethoxysilyl)-propylamine (APMS), N- [3-(Trimethoxysilyl)propyl]ethylenediamine (Diamino-APMS) and N1- [3-(Trimethoxy-silyl)-propyl]diethylenetriamine (Triamino-APMS). The amount of bound coupling agent and heparin was quantified photometrically by the ninhydrin reaction and the tolidine-blue test. The biological potency of heparin was determined photometrically by the chromogenic substrate Chromozym TH and fibrinogen adsorption to the modified surfaces was researched using the QCM-D (Quartz Crystal Microbalance with Dissipation Monitoring) technique. Results Zeta-potential measurements confirmed the successful coupling reaction; the potential of the unmodified anatase surface (approx. -26 mV) shifted into the positive range (> + 40 mV) after silanisation. Binding of heparin results in a strongly negatively charged surface with zeta-potentials of approx. -39 mV. The retaining biological activity of heparin was highest for the spacer molecule Triamino-APMS. QCM-D measurements showed a lower viscosity for adsorbed fibrinogen films on heparinised surfaces by means of Triamino-APMS. Conclusion The remaining activity of heparin was found to be highest for the covalent attachment with Triamino-APMS as coupling agent due to the long chain of this spacer molecule and therefore the highest mobility of the drug. Furthermore, the adsorption of fibrinogen on the differently heparinised surfaces in real time demonstrated that with longer spacer chains the ΔD/Δf ratios became higher, which is also associated with better biocompatible properties of the substrates in contact with a biosystem.
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Affiliation(s)
- David Tebbe
- Department for Functional Materials in Medicine and Dentistry, University of Würzburg, Pleicherwall 2, D-97070 Würzburg, Germany
| | - Roger Thull
- Department for Functional Materials in Medicine and Dentistry, University of Würzburg, Pleicherwall 2, D-97070 Würzburg, Germany
| | - Uwe Gbureck
- Department for Functional Materials in Medicine and Dentistry, University of Würzburg, Pleicherwall 2, D-97070 Würzburg, Germany
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136
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Mattern KJ, Deen WM. Binding of glycosaminoglycans to cyano-activated agarose membranes: kinetic and diffusional effects on yield and homogeneity. Carbohydr Res 2007; 342:2192-201. [PMID: 17610855 DOI: 10.1016/j.carres.2007.06.007] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2007] [Revised: 05/29/2007] [Accepted: 06/04/2007] [Indexed: 11/28/2022]
Abstract
Methods were developed for binding a glycosaminoglycan (GAG, a 50 kDa chondroitin sulfate) to thin agarose membranes using 1-cyano-4-(dimethylamino)pyridinium tetrafluoroborate (CDAP) as the activating agent. Process conditions were optimized to achieve high yields and spatially uniform concentrations of bound ligand. Yields were varied mainly by manipulating the duration and temperature of the aqueous washes prior to coupling, which affected the concentration of active sites available for subsequent GAG binding. The rate constants for degradation of the active cyanate esters in 0.1M bicarbonate solutions were 0.24+/-0.02 h(-1) at 4 degrees C and 0.08+/-0.03 h(-1) at 0 degrees C. Steric limitations in the 3% agarose gels severely restricted binding, with only about 0.1% of active sites being accessible to GAG molecules. The GAG binding occurred primarily in the outer 50-70 microm of the membranes, so that coupling was homogeneous only for thin gels. A model of GAG diffusion and reaction in the coupling step was developed to explain the observed effects of parameters such as the GAG concentration in solution and the membrane thickness. An analysis of the key time scales in the synthesis provides design principles that should be useful also for other cyanylating agents, other ligands, and for beads as well as membranes.
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Affiliation(s)
- Kristin J Mattern
- Department of Chemical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA
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137
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Aldenhoff YBJ, Hanssen JHL, Knetsch MLW, Koole LH. Thrombus Formation at the Surface of Guide-Wire Models: Effects of Heparin-releasing or Heparin-exposing Surface Coatings. J Vasc Interv Radiol 2007; 18:419-25. [PMID: 17377189 DOI: 10.1016/j.jvir.2006.12.733] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022] Open
Abstract
PURPOSE This study was conducted to investigate whether thrombus formation at the surface of guide wires occurs, and--if so--whether this can be suppressed or prevented through incorporation of heparin in the surface coating. MATERIALS AND METHODS Five guide wire models were examined; three had a polymeric hydrophilic surface coating (90/10 guide wire), which was either heparin-free, impregnated with sodium-heparin (Na-hep), or impregnated with benzalkonium heparin (BAK-hep). The other two guide wires had a coating of polytetrafluoroethylene (PTFE), either without heparin, or impregnated with BAK-hep. Release of heparin, exposure of heparin at the surface of the guide wires, thrombogenicity (under static and flow conditions) and their propensity to attract blood platelets were investigated. RESULTS The guide wire 90/10 Na-hep releases approximately 150-200 mU active heparin per cm coil within the first few minutes after incubation in buffer. The PTFE BAK-hep shows a relatively slow release of 60-70 mU active heparin per cm coil. The 90/10 BAK-hep showed no released heparin but the most exposed heparin. In a static experiment with human full blood excessive thrombus formation occurred at the heparin-free models, whereas the others remained essentially clean. In a thrombin-generation assay under flow the authors observed strong retardation of thrombin formation in the case of the 90/10 Na-hep guide wire. CONCLUSIONS The static and dynamic in vitro assays, taken together, show that the 90/10 Na-hep provides a coating with an extremely low level of surface thrombogenicity. Use of a guide wire with a hydrophilic distal coating that releases and exposes sodium heparin may contribute to the safety of diagnostic and therapeutic interventional procedures.
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Affiliation(s)
- Yvette B J Aldenhoff
- Centre for Biomaterials Research, Faculty of Medicine, University of Maastricht, Universiteitssingel 50, 6229 ER Maastricht, The Netherlands.
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138
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Park K, Kim YS, Lee GY, Nam JO, Lee SK, Park RW, Kim SY, Kim IS, Byun Y. Antiangiogenic effect of bile acid acylated heparin derivative. Pharm Res 2006; 24:176-85. [PMID: 17109210 DOI: 10.1007/s11095-006-9139-6] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2006] [Accepted: 07/28/2006] [Indexed: 11/28/2022]
Abstract
PURPOSE Chemically modified heparin-DOCA was prepared and found to have markedly lower anticoagulant activity than heparin. In the present study, we elucidated the antiangiogenic and antitumoral activities of heparin-DOCA derivative. METHODS To evaluate the antiangiogenic and antitumoral effects of heparin-DOCA, capillary-like tube formation assay, Matrigel plug assay in vivo, western blotting for FGFR phosphorylation, ERK and p38 MAPK activities, tumor growth of SCC in vivo and immunostaining of blood vessels in tumor tissues were performed. RESULTS Heparin-DOCA inhibited capillary-like tubular structures of endothelial cells and bFGF-induced neovascularizations in Matrigel plug assays. Signaling experiments showed that heparin-DOCA significantly inhibited angiogenesis by suppressing the phosphorylation of FGFR and its downstream signal pathways (ERK and p38 MAPK activities). The antiangiogenic activity of this heparin derivative was found to be closely associated with antitumoral activity in a mouse model. In addition, histological evaluations supported the inhibitory effect of heparin-DOCA on blood vessel formation in tumor tissues. CONCLUSION Heparin-DOCA derivative exerted a significant antitumoral effect by inhibiting angiogenesis resulting from the disruption of FGF/FGFR and its downstream signal pathways, and could be applied to treat various angiogenic diseases.
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Affiliation(s)
- Kyeongsoon Park
- College of Pharmacy, Seoul National University, San 56-1, Sillim-dong, Gwanak-gu, Seoul, 151-742, South Korea
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Barbucci R, Leone G, Chiumiento A, Di Cocco ME, D'Orazio G, Gianferri R, Delfini M. Low- and high-resolution nuclear magnetic resonance (NMR) characterisation of hyaluronan-based native and sulfated hydrogels. Carbohydr Res 2006; 341:1848-58. [PMID: 16716277 DOI: 10.1016/j.carres.2006.04.046] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2006] [Revised: 04/07/2006] [Accepted: 04/15/2006] [Indexed: 10/24/2022]
Abstract
Hyaluronan-based hydrogels were synthesised using different crosslinking agents, such as 1,3-diaminopropane (1,3-DAP) and 1,6-diaminohexane (1,6-DAE). The hydrogels were sulfated to provide materials (Hyal-1,3-DAP, Hyal-1,6-DAE, HyalS-1,3-DAP and HyalS-1,6-DAE) that were characterised by both high- and low-resolution nuclear magnetic resonance (NMR) spectroscopy. The (13)C NMR spectra of the materials were analysed to identify, characterise and study the crosslinking degree of the hydrogels. The crosslinking degree was also determined by potentiometric titration and the effectiveness of the two techniques was compared. Measurements of longitudinal relaxation times (spin-lattice) and of NOE enhancement were used to study the mobility of the hydrogels. Low-resolution NMR studies allowed the determination of the water transport properties in the hydrogels. In addition, the swelling degree for the various hydrogels was calculated as a function of the longitudinal and transversal relaxation times of the water molecules. Lastly, the self-diffusion coefficients of the water in interaction with the four polysaccharides were measured by the pulsed field gradient spin echo (PFGSE) sequence.
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Affiliation(s)
- Rolando Barbucci
- CRISMA and Department of Chemical and Biosystem Sciences and Technologies, University of Siena, Italy.
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140
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Chung HJ, Kim HK, Yoon JJ, Park TG. Heparin Immobilized Porous PLGA Microspheres for Angiogenic Growth Factor Delivery. Pharm Res 2006; 23:1835-41. [PMID: 16858650 DOI: 10.1007/s11095-006-9039-9] [Citation(s) in RCA: 122] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2006] [Accepted: 04/13/2006] [Indexed: 10/24/2022]
Abstract
PURPOSE Heparin immobilized porous poly(D,L-lactic-co-glycolic acid) (PLGA) microspheres were prepared for sustained release of basic fibroblast growth factor (bFGF) to induce angiogenesis. MATERIALS AND METHODS Porous PLGA microspheres having primary amine groups on the surface were prepared using an oil-in-water (O/W) single emulsion method using Pluronic F-127 as an extractable porogen. Heparin was surface immobilized via covalent conjugation. bFGF was loaded into the heparin functionalized (PLGA-heparin) microspheres by a simple dipping method. The bFGF loaded PLGA-heparin microspheres were tested for in vitro release and in vivo angiogenic activity. RESULTS PLGA microspheres with an open-porous structure were formed. The amount of conjugated amine group onto the microspheres was 1.93+/-0.01 nmol/mg-microspheres, while the amount of heparin was 95.8 pmol/mg-microspheres. PLGA-heparin microspheres released out bFGF in a more sustained manner with a smaller extent of initial burst than PLGA microspheres, indicating that surface immobilized heparin controlled the release rate of bFGF. Subcutaneous implantation of bFGF loaded PLGA-heparin microspheres in mice significantly induced the formation of new vascular microvessels. CONCLUSIONS PLGA microspheres with an open porous structure allowed significant amount of heparin immobilization and bFGF loading. bFGF loaded PLGA-HP microspheres showed sustained release profiles of bFGF in vitro, demonstrating reversible and specific binding of bFGF to immobilized heparin. They also induced local angiogenesis in vivo in an animal model.
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Affiliation(s)
- Hyun Jung Chung
- Department of Biological Sciences, Korea Advanced Institute of Science and Technology, Daejeon 305-701, South Korea
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Duo J, Fletcher H, Stenken JA. Natural and synthetic affinity agents as microdialysis sampling mass transport enhancers: current progress and future perspectives. Biosens Bioelectron 2006; 22:449-57. [PMID: 16797961 DOI: 10.1016/j.bios.2006.05.004] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2005] [Revised: 02/15/2006] [Accepted: 05/03/2006] [Indexed: 10/24/2022]
Abstract
Microdialysis sampling is a diffusion-based separation method that allows analytes to freely diffuse across a hollow fiber semi-permeable dialysis membrane. This sampling technique has been widely used for in vivo chemical collection. The inclusion of affinity-based trapping agents into the microdialysis perfusion fluid serves to improve the relative recovery via the binding reaction of low molecular weight hydrophobic analytes and larger analytes such as peptides and proteins. Here, we briefly review our past studies using different compounds (native cyclodextrins and antibodies) to improve microdialysis sampling recovery. A brief compilation of our studies using antibody-immobilized beads as a means to improve cytokine collection during microdialysis sampling is also described. We present new work focused on the use of antibody-immobilized bead microdialysis sampling enhancement for various endocrine hormones (amylin, GLP-1, glucagon, insulin, and leptin). The antibody-bead enhancement approach allowed for recovery enhancements that ranged between 3 and 20-fold for these peptides. Using the enhanced recovery approach, endocrine peptides at pM concentrations can be quantified. Finally, our initial work focused on developing non-antibody based enhancement agents using bovine serum albumin-heparin conjugates covalently bound to polystyrene microspheres is presented for the cytokine, tumor necrosis factor-alpha (TNF-alpha). Unlike antibodies, heparin provides the advantage of being reusable as an enhancement agent and served to improve the relative recovery of TNF-alpha by three-fold.
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Affiliation(s)
- Jia Duo
- Department of Chemistry and Chemical Biology, Center for Biotechnology and Interdisciplinary Studies, Rensselaer Polytechnic Institute, Troy, NY 12180, USA
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Choi SH, Lee JH, Choi SM, Park TG. Thermally reversible pluronic/heparin nanocapsules exhibiting 1000-fold volume transition. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2006; 22:1758-62. [PMID: 16460102 DOI: 10.1021/la052549n] [Citation(s) in RCA: 66] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
Novel Pluronic/heparin composite nanocapsules that exhibit a thermally responsible swelling and deswelling behavior were synthesized. Pluronic F-127 preactivated with p-nitrophenyl chloroformate at its two terminal hydroxyl groups was dissolved in a methylene chloride phase. The organic phase was dispersed in an aqueous phase containing heparin. At an organic/aqueous interface, Pluronic-cross-linked heparin nanocapsules were produced. They exhibited a 1000-fold volume transition (ca. 336 nm at 25 degrees C; ca. 32 nm at 37 degrees C), and a reversible swelling and deswelling behavior when the temperature was cycled between 20 and 37 degrees C. The reversible volume transition of Pluronic nanocapsules was caused by micellization and demicellization of cross-linked Pluronic polymer chains within the nanocapsule structure in response to temperature. The morphological characters were investigated with transmission electron microscopy and small angle neutron scattering. Pluronic/heparin nanocapsules had an aqueous fluid-filled hollow interior with a surrounding shell layer below the critical temperature, but they became a collapsed core/shell structure similar to that of Pluronic micelles above it.
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Affiliation(s)
- Seung Ho Choi
- Department of Biological Sciences, Korea Advanced Institute of Science and Technology, Daejeon 305-701, South Korea
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Chen MC, Liang HF, Chiu YL, Chang Y, Wei HJ, Sung HW. A novel drug-eluting stent spray-coated with multi-layers of collagen and sirolimus. J Control Release 2005; 108:178-89. [PMID: 16162366 DOI: 10.1016/j.jconrel.2005.07.022] [Citation(s) in RCA: 115] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2005] [Revised: 07/26/2005] [Accepted: 07/30/2005] [Indexed: 11/26/2022]
Abstract
In the study, a novel drug-eluting stent for treating the coronary arterial stenosis was developed. Using a spray-coating method, aqueous bovine type I collagen and sirolimus were coated layer-by-layer alternatively onto the surface of a metallic stent and a topcoat of collagen was used as a barrier to control drug release. To prevent dissolution of the collagen matrices, the spray-coated collagen was further crosslinked by genipin, a naturally occurring crosslinking agent. The results obtained in the atomic force microscopy (AFM) examination suggested that the spray-coated collagen was tightly adhered to the surface of the stent. Additionally, the collagen coating was demonstrated by the scanning electron microscopy (SEM) to be sufficiently flexible to allow balloon expansion of the stent without cracking or peeling from the wire. The resistance against enzymatic degradation and the hemocompatibility of the collagen matrices increased significantly as their degree of crosslinking increased. All the studied sirolimus-loaded stents exhibited a nearly linear sustained-release profile (except at the end stage of release) with no significant burst releases. It was found that a topcoat of collagen on the collagen/sirolimus coated stent did slow down the release of sirolimus to some extent. Additionally, the number of layers of collagen/sirolimus coated significantly affected the duration of sirolimus released. Furthermore, the sustained-release duration of sirolimus was proportional to the actual amount of drug loaded on the stent. The aforementioned results indicated that the drug-eluting stent developed had a tightly adhered collagen coating and can be used as a drug reservoir to sustain release of sirolimus.
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Affiliation(s)
- Mei-Chin Chen
- Department of Chemical Engineering, National Tsing Hua University, Hsinchu, Taiwan, R.O.C
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145
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Zhou Z, Meyerhoff ME. Preparation and characterization of polymeric coatings with combined nitric oxide release and immobilized active heparin. Biomaterials 2005; 26:6506-17. [PMID: 15941584 DOI: 10.1016/j.biomaterials.2005.04.046] [Citation(s) in RCA: 92] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2004] [Accepted: 04/07/2005] [Indexed: 11/20/2022]
Abstract
A new dual acting polymeric coating is described that combines nitric oxide (NO) release with surface-bound active heparin, with the aim of mimicking the nonthrombogenic properties of the endothelial cell (EC) layer that lines the inner wall of healthy blood vessels. A trilayer membrane configuration is employed to create the proposed blood compatible coating. A given polymeric substrate (e.g., the outer surface of a catheter sleeve, etc.) is first coated with a dense polymer layer, followed by a plasticized poly(vinyl chloride) (PVC) or polyurethane (PU) layer doped with a lipophilic N-diazeniumdiolate as the NO donor species. Finally, an outer aminated polymer layer is applied. Porcine heparin is then covalently linked to the outer layer via formation of amide bonds. The surface-bound heparin is shown to possess anti-coagulant activity in the range of 4.80-6.39 mIU/cm2 as determined by a chromogenic anti-Factor Xa assay. Further, the surface NO flux from the underlying polymer layer containing the diazeniumdiolate species can be controlled and maintained at various levels (from 0.5 to 60 x 10(-10) mol cm(-2)min(-1)) for at least 24 h and up to 1 week (depending on the flux level desired) by changing the chemical/polymer composition of the NO release layer. The proposed polymeric coatings are capable of functioning by two complementary anti-thrombotic mechanisms, one based on the potent anti-platelet activity of NO, and the other the result of the ability of immobilized heparin to inhibit Factor Xa and thrombin (Factor IIa). Thus, the proposed polymeric coatings are expected to exhibit greatly enhanced thromboresistivity compared to polymers that utilize either immobilized heparin or NO release alone.
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Affiliation(s)
- Zhengrong Zhou
- Department of Chemistry, The University of Michigan, Ann Arbor, MI 48109-1055, USA
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146
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Chang Y, Hsu CK, Wei HJ, Chen SC, Liang HC, Lai PH, Sung HW. Cell-free xenogenic vascular grafts fixed with glutaraldehyde or genipin: in vitro and in vivo studies. J Biotechnol 2005; 120:207-19. [PMID: 16112218 DOI: 10.1016/j.jbiotec.2005.06.029] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2005] [Revised: 05/30/2005] [Accepted: 06/07/2005] [Indexed: 10/25/2022]
Abstract
Chronic rejection of arterial xenografts results in aneurysmal dilation, due to immune mediated processes. To minimize the immunologic degradation of the graft, a cell-extraction process employing sodium dodecyl sulfate (SDS) was used in the study to remove the cellular components in bovine carotid arteries. To further reduce their immunogenicity, the acellular arteries were fixed with glutaraldehyde (A-GA) or genipin (A-GP). The in vitro properties of all test samples were analyzed. Additionally, the in vivo performance of the heparinized A-GA and A-GP grafts (H-A-GA and H-A-GP) was evaluated in a canine model. It was found that the SDS treatment effectively removed cells from the arterial wall, but the main structures of the extracellular matrix were preserved with a portion of the water-soluble glycosaminoglycans removed. After cell extraction, the elastic lamellae in the media became straightened, and thus made the tissue less extensile. The heparinized tissues significantly reduced platelet adhesion. At retrieval, all implanted grafts were patent and not dilated. Chronic inflammatory response surrounding the implants was observed. However, fixation of acellular tissues by glutaraldehyde or genipin inhibited immune cell penetration into the media and limited tissue degradation, and therefore prevented the arterial wall from dilation. Nevertheless, the H-A-GP graft was superior to the H-A-GA graft in completeness of endothelialization on its luminal surface, and thus precluded thrombus formation.
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Affiliation(s)
- Yen Chang
- Division of Cardiovascular Surgery, Veterans General Hospital-Taichung and College of Medicine, National Yang-Ming University, Taipei, Taiwan, ROC
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147
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Wang HJ, Lin ZX, Liu XM, Sheng SY, Wang JY. Heparin-loaded zein microsphere film and hemocompatibility. J Control Release 2005; 105:120-31. [PMID: 15893840 DOI: 10.1016/j.jconrel.2005.03.014] [Citation(s) in RCA: 127] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2004] [Revised: 03/21/2005] [Accepted: 03/25/2005] [Indexed: 11/22/2022]
Abstract
Zein was studied as a drug-eluting coating film composed of zein microspheres for cardiovascular devices (e.g. stent). In vitro 3-(4,5-Dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide (MTT) analysis showed that both zein film and its degraded product had better biocompatibility compared with Corning culture plate on the growth of human umbilical veins endothelial cells (HUVECs, p<0.05, n=6), and the effect of zein degraded product on HUVECs was dose-dependent. The best result was obtained at 0.3 mg/ml of the addition. The encapsulation efficiency of heparin and heparin loading varied with the amount of both zein and heparin, and the highest encapsulation efficiency (heparin 1.33 mg/ml and zein 16 mg/ml) was 22.77+/-1.33% (n=3). Scanning electron microscope (SEM) observation indicated that the zein film was made of microspheres in diameter from nano- to micrometer, which could be controlled. Sizes of heparin-loaded zein microspheres changed before and after release of heparin because of conglutination among zein microspheres. Release rate of heparin from microsphere film reached to 33.5+/-1.2% within 12 h, and began to get into subsequent "slow release" phase; about 55% of the entrapped heparin was released after 20 days. Both zein film and heparin-loaded zein microsphere film were effective in suppressing platelet adhesion, and the heparin-loaded film showed a better anticoagulation as determined with thrombin time (TT) assay. These results suggest that zein film could be used directly as a new type of coating material for its better biocompatibility with HUVECs. Moreover, the heparin-loaded zein microsphere film can significantly improve the hemocompatibility.
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Affiliation(s)
- Hua-Jie Wang
- School of Life Science and Biotechnology, Shanghai Jiaotong University, 1954 Huashan Road, Shanghai 200030, China
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148
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Curatella B, Bartolini B, Di Caro A, Cavallaro RA, Liverani L, Mascellani G, Benedetto A, Castilletti C, Capobianchi MR, Cellai L. Sepharose-bound, highly sulfated glycosaminoglycans can capture HIV-1 from culture medium. Carbohydr Res 2005; 340:759-64. [PMID: 15721350 DOI: 10.1016/j.carres.2004.12.017] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2003] [Revised: 11/29/2004] [Accepted: 12/19/2004] [Indexed: 11/23/2022]
Abstract
In the search for new strategies against HIV-1 and on the basis of a number of previous studies reporting on the capacity of certain polyanionic compounds to influence the replication of HIV-1, we prepared a few chemically oversulfated dermatan and chondroitin sulfates. Four of these compounds and two samples of heparin were bound to activated Sepharose through either their carboxylic groups, or their aldehydic groups, or their deacetylated primary amino groups. Some of these so-derivatised resins, packed into columns, proved able to remove HIV-1 IIIB, a laboratory adapted strain, and one clinical primary isolate from an AIDS patient, from infected cell culture medium. The resins bind the virus very tightly and could be useful for capturing the virus from infected fluids.
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Affiliation(s)
- Barbara Curatella
- Istituto di Cristallografia, Sezione di Monterotondo, CNR, PO Box 10, I-00016 Monterotondo Stazione, Rome, Italy
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149
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Yao C, Prével P, Koch S, Schenck P, Noah EM, Pallua N, Steffens G. Modification of Collagen Matrices for Enhancing Angiogenesis. Cells Tissues Organs 2005; 178:189-96. [PMID: 15812146 DOI: 10.1159/000083730] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/19/2004] [Indexed: 11/19/2022] Open
Abstract
The vascularization of engineered tissues in many cases does not keep up with the ingrowth of cells. Nutrient and oxygen supply are not sufficient, which ultimately leads to the death of the invading cells. The enhancement of the angiogenic capabilities of engineered tissues therefore represents a major challenge in the field of tissue engineering. The immobilization of angiogenic growth factors may be useful for enhancing angiogenesis. The most potent angiogenic growth factor specific to endothelial cells, vascular endothelial growth factor (VEGF), occurs in several splice variants. The variant with 165 amino acids both has a high angiogenic activity and a high affinity for heparin. We therefore incorporated heparin molecules into collagen matrices by covalently cross-linking them to amino functions on the collagen. Physical binding of VEGF to the heparin may then prevent a rapid clearance from the implant, while the release rate may become coupled to the degradation of the collagen matrix. The modified matrices were characterized by determination of the extent of the heparin immobilization, the in vitro degradation rate by collagenase. For testing the angiogenic properties, non-modified and heparinized collagen specimens were--either loaded with VEGF or non-loaded--subcutaneously implanted on the back of rats. Specimens were explanted after varying periods of implantation, the dry weights and the hemoglobin contents, as well as immunostained histological sections were evaluated: heparinized collagen matrices loaded with VEGF are vascularized to a substantially higher extent as compared to non-modified matrices.
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Affiliation(s)
- Chang Yao
- Institute of Biochemistry, University Hospital, RWTH Aachen University, Aachen, Germany
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150
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Park K, Kim K, Kwon IC, Kim SK, Lee S, Lee DY, Byun Y. Preparation and characterization of self-assembled nanoparticles of heparin-deoxycholic acid conjugates. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2004; 20:11726-11731. [PMID: 15595804 DOI: 10.1021/la048646i] [Citation(s) in RCA: 103] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Various deoxycholic acid (DOCA) bearing heparin (HD) amphiphilic conjugates with different degrees of substitution (DS) with DOCA were synthesized using heparin as a hydrophilic segment and DOCA as a hydrophobic segment. Structural characteristics of these HD conjugates were investigated using 1H NMR, dynamic light scattering, zeta potential, transmission electron microscopy (TEM), and fluorescence spectroscopy. HD conjugates provided monodispersed self-aggregates in water, with mean diameters decreasing with increasing DOCA DS in the range of 120-200 nm. HD aggregates were covered with negatively charged heparin shells, exhibiting xi potentials near -56 mV. The critical aggregation concentration (cac) of the HD (0.02-0.003 mg/mL) depended upon DOCA DS. TEM images demonstrated that the shape of the self-aggregates was spherical. Partition equilibrium constants, Kv, for pyrene in the self-aggregates in water indicated that increasing DS enhanced the hydrophobicity of the self-aggregate inner core. The mean aggregation number of DOCA per hydrophobic microdomain, estimated by the fluorescence quenching methods using cetylpyridinium chloride, indicated that five to nine of HD chains comprised a hydrophobic domain in the conjugates.
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Affiliation(s)
- Kyeongsoon Park
- Center for Cell and Macromolecular Therapy, Department of Materials Science and Engineering, Gwangju Institute of Science and Technology, 1 Oryong-dong Puk-gu Gwangju 500-712, Korea
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