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Muhaxi M, Liu F, Ng TB. Structural characterization and in vitro hepatoprotective activity of a novel antioxidant polysaccharide from fruiting bodies of the mushroom Pleurotus ferulae. Int J Biol Macromol 2023:125124. [PMID: 37290546 DOI: 10.1016/j.ijbiomac.2023.125124] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2023] [Revised: 05/20/2023] [Accepted: 05/25/2023] [Indexed: 06/10/2023]
Abstract
In the present study, three novel antioxidant polysaccharides (G-1, AG-1, and AG-2) were isolated and purified from Pleurotus ferulae using mouse erythrocyte hemolysis inhibitory activity as an indicator. These components showed antioxidant activity at the chemical and cellular levels. Given that G-1 displayed superior performance in protecting the human hepatocyte L02 cells against oxidative damage caused by H2O2 compared to AG-1 and AG-2 and had a higher yield and purification rate, the detailed structure of G-1 was further characterized. G-1 mainly contains six kinds of linkage type units as A: →4,6)-α-d-Glcp-(1→, B: →3)-β-d-Glcp-(1→, C: →2,6)-β-d-Glcp-(1→, d: β-d-Manp(1→, E: →6)-β-d-Galp-(1→, F: →4)-β-d-Glcp-(1→. Finally, the potential in vitro hepatoprotective mechanism of G-1 was discussed and elucidated. Results suggested that G-1 can protect L02 cells from H2O2-induced damage by reducing the leakage of AST and ALT from the cytoplasm, enhancing the activities of SOD and CAT, and suppressing lipid peroxidation and production of LDH. G-1 could further reduce the production of ROS, stabilize mitochondrial membrane potential and maintain cell morphology. Hence, G-1 could be a valuable functional food with antioxidant and hepatoprotective activities.
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Affiliation(s)
- Muguli Muhaxi
- Department of Microbiology, The Key Laboratory of Molecular Microbiology and Technology, Ministry of Education, Nankai University, Tianjin 300071, China
| | - Fang Liu
- Department of Microbiology, The Key Laboratory of Molecular Microbiology and Technology, Ministry of Education, Nankai University, Tianjin 300071, China.
| | - Tzi Bun Ng
- School of Biomedical Sciences, Faculty of Medicine, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China.
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Alviset G, Corvis Y, Hammad K, Lemut J, Maury M, Mignet N, Boudy V. New Preservative-Free Formulation for the Enhanced Ocular Bioavailability of Prostaglandin Analogues in Glaucoma. Pharmaceutics 2022; 14:pharmaceutics14020453. [PMID: 35214185 PMCID: PMC8877962 DOI: 10.3390/pharmaceutics14020453] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2022] [Revised: 02/17/2022] [Accepted: 02/18/2022] [Indexed: 02/04/2023] Open
Abstract
Glaucoma is a wide-spread eye disease caused by elevated intraocular pressure. Uncontrolled, this pressure may lead to damages to the optic nerve. Prostaglandin analogues, such as latanoprost and travoprost (which are water-insoluble active substances), are the most used class of active pharmaceutical ingredient. To administer them as eye drops, preservatives, such as benzalkonium chloride, are used as solubilizers. The latter is known to cause a local inflammation when used chronically and is not recommended for patients with ocular surface disorders. In this work, we sought to use polysorbate 80 (PS80) as a solubilizing agent simultaneously with sodium hyaluronate (NaHA) as a thickener and cytoprotective agent for the corneal surface. The first part of this study assessed the compatibility of the excipients with the active substance, using physicochemical methods such as spectra fluorescence and differential scanning calorimetry (DSC), as well as the solubilization mechanism of PS80 regarding prostaglandin analogues using nuclear magnetic resonance (NMR). The second part evaluated the stability of a formula candidate, its viscosity upon instillation, and its pharmacokinetic profile in rabbits as compared to the commercially approved medicine Travatan®. The results show that sodium hyaluronate is inert with respect to travoprost, while PS80 successfully solubilizes it, meaning that benzalkonium chloride is no longer required. Moreover, the pharmacokinetic profiles of the rabbits showed that the original formula described in the present study enhanced the ocular bioavailability of the drug, making it a promising product to control intraocular pressure with a potential reduced dosage of travoprost, therefore minimizing its related side effects.
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Affiliation(s)
- Gabriel Alviset
- Unither Développement Bordeaux, ZA Tech Espace, av. Toussaint Catros, 33185 Le Haillan, France;
- Faculté de Santé de Paris, CNRS, INSERM, UTCBS, 75006 Paris, France; (Y.C.); (N.M.)
- Assistance Publique Hôpitaux de Paris (AP-HP), Agence Générale des Équipements et Produits de Santé (AGEPS), Département de Recherche et Développement Pharmaceutique (DRDP), 7 rue du fer à Moulin, 75005 Paris, France
| | - Yohann Corvis
- Faculté de Santé de Paris, CNRS, INSERM, UTCBS, 75006 Paris, France; (Y.C.); (N.M.)
| | - Karim Hammad
- Faculté de Santé de Paris, CNRS, CiTCoM, 75006 Paris, France;
| | - Josiane Lemut
- CMC Expert, 84 rue Maurice Béjart, 34080 Montpellier, France;
- Unither Pharmaceuticals, 3-5 rue St-Georges, 75009 Paris, France;
| | - Marc Maury
- Unither Pharmaceuticals, 3-5 rue St-Georges, 75009 Paris, France;
| | - Nathalie Mignet
- Faculté de Santé de Paris, CNRS, INSERM, UTCBS, 75006 Paris, France; (Y.C.); (N.M.)
| | - Vincent Boudy
- Faculté de Santé de Paris, CNRS, INSERM, UTCBS, 75006 Paris, France; (Y.C.); (N.M.)
- Assistance Publique Hôpitaux de Paris (AP-HP), Agence Générale des Équipements et Produits de Santé (AGEPS), Département de Recherche et Développement Pharmaceutique (DRDP), 7 rue du fer à Moulin, 75005 Paris, France
- Correspondence: ; Tel.: +33-1-4669-1576
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A sulfated polysaccharide from abalone influences iron uptake by the contrary impacts of its chelating and reducing activities. Int J Biol Macromol 2019; 138:49-56. [DOI: 10.1016/j.ijbiomac.2019.07.072] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2019] [Revised: 07/09/2019] [Accepted: 07/09/2019] [Indexed: 12/26/2022]
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Hu MS, Borrelli MR, Hong WX, Malhotra S, Cheung ATM, Ransom RC, Rennert RC, Morrison SD, Lorenz HP, Longaker MT. Embryonic skin development and repair. Organogenesis 2018; 14:46-63. [PMID: 29420124 PMCID: PMC6150059 DOI: 10.1080/15476278.2017.1421882] [Citation(s) in RCA: 39] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2017] [Revised: 12/15/2017] [Accepted: 12/21/2017] [Indexed: 12/31/2022] Open
Abstract
Fetal cutaneous wounds have the unique ability to completely regenerate wounded skin and heal without scarring. However, adult cutaneous wounds heal via a fibroproliferative response which results in the formation of a scar. Understanding the mechanism(s) of scarless wound healing leads to enormous clinical potential in facilitating an environment conducive to scarless healing in adult cutaneous wounds. This article reviews the embryonic development of the skin and outlines the structural and functional differences in adult and fetal wound healing phenotypes. A review of current developments made towards applying this clinical knowledge to promote scarless healing in adult wounds is addressed.
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Affiliation(s)
- Michael S. Hu
- Hagey Laboratory for Pediatric Regenerative Medicine, Department of Surgery, Division of Plastic Surgery, Stanford University School of Medicine, Stanford, California
- Stanford Institute for Stem Cell Biology and Regenerative Medicine, Stanford University School of Medicine, Stanford, California
| | - Mimi R. Borrelli
- Hagey Laboratory for Pediatric Regenerative Medicine, Department of Surgery, Division of Plastic Surgery, Stanford University School of Medicine, Stanford, California
| | - Wan Xing Hong
- Hagey Laboratory for Pediatric Regenerative Medicine, Department of Surgery, Division of Plastic Surgery, Stanford University School of Medicine, Stanford, California
| | - Samir Malhotra
- Hagey Laboratory for Pediatric Regenerative Medicine, Department of Surgery, Division of Plastic Surgery, Stanford University School of Medicine, Stanford, California
| | - Alexander T. M. Cheung
- Hagey Laboratory for Pediatric Regenerative Medicine, Department of Surgery, Division of Plastic Surgery, Stanford University School of Medicine, Stanford, California
| | - Ryan C. Ransom
- Hagey Laboratory for Pediatric Regenerative Medicine, Department of Surgery, Division of Plastic Surgery, Stanford University School of Medicine, Stanford, California
| | - Robert C. Rennert
- Hagey Laboratory for Pediatric Regenerative Medicine, Department of Surgery, Division of Plastic Surgery, Stanford University School of Medicine, Stanford, California
| | - Shane D. Morrison
- Hagey Laboratory for Pediatric Regenerative Medicine, Department of Surgery, Division of Plastic Surgery, Stanford University School of Medicine, Stanford, California
| | - H. Peter Lorenz
- Hagey Laboratory for Pediatric Regenerative Medicine, Department of Surgery, Division of Plastic Surgery, Stanford University School of Medicine, Stanford, California
| | - Michael T. Longaker
- Hagey Laboratory for Pediatric Regenerative Medicine, Department of Surgery, Division of Plastic Surgery, Stanford University School of Medicine, Stanford, California
- Stanford Institute for Stem Cell Biology and Regenerative Medicine, Stanford University School of Medicine, Stanford, California
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Travan A, Scognamiglio F, Borgogna M, Marsich E, Donati I, Tarusha L, Grassi M, Paoletti S. Hyaluronan delivery by polymer demixing in polysaccharide-based hydrogels and membranes for biomedical applications. Carbohydr Polym 2016; 150:408-18. [DOI: 10.1016/j.carbpol.2016.03.088] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2016] [Revised: 03/14/2016] [Accepted: 03/29/2016] [Indexed: 02/08/2023]
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Bioactive TGF-β1/HA Alginate-Based Scaffolds for Osteochondral Tissue Repair: Design, Realization and Multilevel Characterization. J Appl Biomater Funct Mater 2016; 14:e42-52. [DOI: 10.5301/jabfm.5000249] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/25/2015] [Indexed: 11/20/2022] Open
Abstract
Background The design of an appropriate microenvironment for stem cell differentiation constitutes a multitask mission and a critical step toward the clinical application of tissue substitutes. With the aim of producing a bioactive material for orthopedic applications, a transforming growth factor-β (TGF- β1)/hydroxyapatite (HA) association within an alginate-based scaffold was investigated. The bioactive scaffold was carefully designed to offer specific biochemical cues for an efficient and selective cell differentiation toward the bony and chondral lineages. Methods Highly porous alginate scaffolds were fabricated from a mixture of calcium cross-linked alginates by means of a freeze-drying technique. In the chondral layer, the TGF in citric acid was mixed with an alginate/alginate-sulfate solution. In the bony layer, HA granules were added as bioactive signal, to offer an osteoinductive surface to the cells. Optical and scanning electron microscopy analyses were performed to assess the macro-micro architecture of the biphasic scaffold. Different mechanical tests were conducted to evaluate the elastic modulus of the grafts. For the biological validation of the developed prototype, mesenchymal stem cells were loaded onto the samples; cellular adhesion, proliferation and in vivo biocompatibility were evaluated. Results and conclusions The results successfully demonstrated the efficacy of the designed osteochondral graft, which combined interesting functional properties and biomechanical performances, thus becoming a promising candidate for osteochondral tissue-engineering applications.
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Wang J, Chen H, Wang Y, Xing L. Synthesis and characterization of a new Inonotus obliquus polysaccharide-iron(III) complex. Int J Biol Macromol 2015; 75:210-7. [DOI: 10.1016/j.ijbiomac.2015.01.041] [Citation(s) in RCA: 59] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2014] [Revised: 01/22/2015] [Accepted: 01/24/2015] [Indexed: 11/15/2022]
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Chen YH, Li J, Hao YB, Qi JX, Dong NG, Wu CL, Wang Q. Preparation and characterization of composite hydrogels based on crosslinked hyaluronic acid and sodium alginate. J Appl Polym Sci 2015. [DOI: 10.1002/app.41898] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Affiliation(s)
- Yong-Hao Chen
- Institute of Forestry and Pomology, Beijing Academy of Agriculture and Forestry Science; Beijing 100093 China
| | - Jun Li
- Beijing Institute of Landscape Architecture; Beijing 100102 China
| | - Yan-Bin Hao
- Institute of Forestry and Pomology, Beijing Academy of Agriculture and Forestry Science; Beijing 100093 China
| | - Jian-Xun Qi
- Institute of Forestry and Pomology, Beijing Academy of Agriculture and Forestry Science; Beijing 100093 China
| | - Ning-Guang Dong
- Institute of Forestry and Pomology, Beijing Academy of Agriculture and Forestry Science; Beijing 100093 China
| | - Chun-Lin Wu
- Institute of Forestry and Pomology, Beijing Academy of Agriculture and Forestry Science; Beijing 100093 China
| | - Qiang Wang
- Institute of Agrofood Science and Technology, Chinese Academy of Agricultural Sciences; Beijing 100193 China
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Tobar-Grande B, Godoy R, Bustos P, von Plessing C, Fattal E, Tsapis N, Olave C, Gómez-Gaete C. Development of biodegradable methylprednisolone microparticles for treatment of articular pathology using a spray-drying technique. Int J Nanomedicine 2013; 8:2065-76. [PMID: 23737670 PMCID: PMC3668958 DOI: 10.2147/ijn.s39327] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
In this work, microparticles were prepared by spray-drying using albumin, chondroitin sulfate, and hyaluronic acid as excipients to create a controlled-release methylprednisolone system for use in inflammatory disorders such as arthritis. Scanning electron microscopy demonstrated that these microparticles were almost spherical, with development of surface wrinkling as the methylprednisolone load in the formulation was increased. The methylprednisolone load also had a direct influence on the mean diameter and zeta potential of the microparticles. Interactions between formulation excipients and the active drug were evaluated by x-ray diffraction, differential scanning calorimetry, and thermal gravimetric analysis, showing limited amounts of methylprednisolone in a crystalline state in the loaded microparticles. The encapsulation efficiency of methylprednisolone was approximately 89% in all formulations. The rate of methylprednisolone release from the microparticles depended on the initial drug load in the formulation. In vitro cytotoxic evaluation using THP-1 cells showed that none of the formulations prepared triggered an inflammatory response on release of interleukin-1β, nor did they affect cellular viability, except for the 9.1% methylprednisolone formulation, which was the maximum test concentration used. The microparticles developed in this study have characteristics amenable to a therapeutic role in inflammatory pathology, such as arthritis.
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Affiliation(s)
- Blanca Tobar-Grande
- Departamento de Farmacia, Facultad de Farmacia, Universidad de Concepción, Concepción, Chile
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Li N, Li XR, Zhou YX, Li WJ, Zhao Y, Ma SJ, Li JW, Gao YJ, Liu Y, Wang XL, Yin DD. The use of polyion complex micelles to enhance the oral delivery of salmon calcitonin and transport mechanism across the intestinal epithelial barrier. Biomaterials 2012; 33:8881-92. [PMID: 22975427 DOI: 10.1016/j.biomaterials.2012.08.047] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2012] [Accepted: 08/22/2012] [Indexed: 01/19/2023]
Abstract
The objective of the present study was to demonstrate the effect of polyanionic copolymer mPEG-grafted-alginic acid (mPEG-g-AA)-based polyion complex (PIC) micelles on enhancing the oral absorption of salmon calcitonin (sCT) in vivo and in vitro and identify the transepithelial transport mechanism of PIC micelles across the intestinal barrier. mPEG-g-AA was first successfully synthesized and characterized in cytotoxicity. The PIC micelles were approximately of 72 nm in diameter with a narrow distribution. The extremely significant enhancement of hypocalcemia efficacy of sCT-loaded PIC micelles in rats was evidenced by intraduodenal administration in comparison with sCT solution. The presence of mPEG-grafted-chitosan in PIC micelles had no favorable effect on this action in the referred content. In the Caco-2 transport studies, PIC micelles could significantly increase the permeability of sCT across Caco-2 monolayers without significantly affecting transepithelial electrical resistance values during the transport study. No evident alterations in the F-actin cytoskeleton were detected by confocal microscope observation following treatment of the cell monolayers with PIC micelles, which further certified the incapacity of PIC micelles to open the intercellular tight junctions. In addition, TEM observations showed that the intact PIC micelles were transported across the everted gut sac. These suggested that the transport of PIC micelles across Caco-2 cell monolayers involve a predominant transcytosis mechanism via endocytosis rather than paracellular pathway. Furthermore, PIC micelles were localized in both the cytoplasm and the nuclei observed by CLSM. Therefore, PIC micelles might be a potentially applicable tool for enhancing the oral absorption of cationic peptide and protein drugs.
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Affiliation(s)
- Na Li
- Department of Pharmaceutics, School of Pharmaceutical Sciences, Peking University, Beijing 100191, China
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Chung CW, Kang JY, Yoon IS, Hwang HD, Balakrishnan P, Cho HJ, Chung KD, Kang DH, Kim DD. Interpenetrating polymer network (IPN) scaffolds of sodium hyaluronate and sodium alginate for chondrocyte culture. Colloids Surf B Biointerfaces 2011; 88:711-6. [DOI: 10.1016/j.colsurfb.2011.08.005] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2011] [Revised: 08/08/2011] [Accepted: 08/08/2011] [Indexed: 11/27/2022]
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12
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Kim DD, Kim DH, Son YJ. Three-Dimensional Porous Scaffold of Hyaluronic Acid for Cartilage Tissue Engineering. ACTIVE IMPLANTS AND SCAFFOLDS FOR TISSUE REGENERATION 2010. [DOI: 10.1007/8415_2010_51] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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Hariraksapitak P, Supaphol P. Preparation and properties of α-chitin-whisker-reinforced hyaluronan-gelatin nanocomposite scaffolds. J Appl Polym Sci 2010. [DOI: 10.1002/app.32095] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Broderick E, Lyons H, Pembroke T, Byrne H, Murray B, Hall M. The characterisation of a novel, covalently modified, amphiphilic alginate derivative, which retains gelling and non-toxic properties. J Colloid Interface Sci 2006; 298:154-61. [PMID: 16414061 DOI: 10.1016/j.jcis.2005.12.026] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2005] [Revised: 12/13/2005] [Accepted: 12/13/2005] [Indexed: 11/18/2022]
Abstract
The characterisation of a novel amphiphilic material, Alg-C4, produced from butanol linked by esterification to alginate is presented. The novel derivative retains the gelling and non-toxic properties of native alginate. FTIR spectra of Alg-C4 contained the characteristic hydroxyl and carboxyl bands, but also featured additional peaks at 1736 and 1134 cm(-1), indicating the presence of ester bonds. NMR studies showed the presence of butyl groups. The endothermic peak and exothermic peak present in the DSC thermogram of native alginate were also apparent in the Alg-C4 thermogram, but had shifted to lower temperatures (from 106 to 87 degrees C and from 254 to 247 degrees C, respectively). In addition, the exothermic peak was significantly reduced for Alg-C4 (5 mW compared to 20 mW in native alginate). Scanning electron microscopy was used to examine surface topography. The native alginate beads appeared smooth while Alg-C4 beads had a different, rougher appearance. Using circular dichroism it was found that the ratio of mannuronic to guluronic residues in the Alg-C4 was markedly increased compared to the native alginate (1.33 to 2.47), suggesting the preferential esterification of butanol to the guluronic residues. Exposure of ovarian granulosa cells in vitro to the Alg-C4 material demonstrated that granulosa cell viability (MTT test) was unchanged when compared to native alginate, which is regarded as non-toxic. The novel material is very stable, giving identical FTIR, DSC and gelling performance after 12 months storage at temperatures ranging from 10 to 20 degrees C. The data support the successful preparation of a stable modified alginate with characteristic hydrophilic properties and, in addition, a novel hydrophobic character.
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Affiliation(s)
- Eilish Broderick
- Department of Chemical and Life Sciences, Institute of Technology, Tralee, Co. Kerry, Ireland
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Taravel F, Mazeau K, Tvaros¡ka I. Computer Modeling of Polysaccharide–Polysaccharide Interactions. POLYSACCHARIDES 2004. [DOI: 10.1201/9781420030822.ch11] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
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Hu M, Sabelman EE, Cao Y, Chang J, Hentz VR. Three-dimensional hyaluronic acid grafts promote healing and reduce scar formation in skin incision wounds. ACTA ACUST UNITED AC 2003; 67:586-92. [PMID: 14528455 DOI: 10.1002/jbm.b.20001] [Citation(s) in RCA: 55] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Hyaluronic acid (HA) has been found to play important roles in tissue regeneration and wound-healing processes. Fetal tissue with a high concentration of HA heals rapidly without scarring. The present study employed HA formed into three-dimensional strands with or without keratinocytes to treat full-thickness skin incision wounds in rats. Wound closure rates of HA strand grafts both with and without keratinocytes were substantially enhanced. The closure times of both HA grafts were less than 1 day (average 16 h), about 1/7 that of the contralateral control incisions (114 h, p <.01). Average wound areas after 10 days were HA-only graft: 0.151 mm2 +/- 0.035; HA + cell grafts: 0.143 mm2 +/- 0.036 and controls: 14.434 mm2 +/- 1.175, experimental areas were 1% of the controls (p < 0.01). Transforming growth factor (TGF) beta1 measured by immunostaining was remarkably reduced in HA-treated wounds compared to the controls. In conclusion, HA grafts appeared to produce a fetal-like environment with reduced TGF-beta1, which is known to be elevated in incipient scars. The HA strands with or without cultured cells may potentially improve clinical wound healing as well as reduce scar formation.
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Affiliation(s)
- Min Hu
- Functional Restoration Department, Stanford University School of Medicine, CA, USA.
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Zhu H, Ji J, Lin R, Gao C, Feng L, Shen J. Surface engineering of poly(DL-lactic acid) by entrapment of alginate-amino acid derivatives for promotion of chondrogenesis. Biomaterials 2002; 23:3141-8. [PMID: 12102185 DOI: 10.1016/s0142-9612(02)00058-3] [Citation(s) in RCA: 70] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Alginate-amino acid derivatives were explored to engineer poly(DL-lactic acid)(PDL-LA) as glycocalyx-like surface to promote cell adhesion and growth. Four different kinds of alginate-amino acid derivatives were synthesized to mimic the glycocalyx of cell membrane to promote chondrogenesis. The alginate-amino acid derivatives were characterized by FT-IR, 1H NMR and UV spectra and the amino acid content on alginate-amino acid derivatives was given by ninhydrin-UV method. A new strategy, entrapment, was then employed to modify PDL-LA membranes with alginate and its amino acid derivatives. The results of XPS, ATR-FTIR and contact angle confirmed that a stable thin film of alginate and its amino acid derivatives can be entrapped on the surface of PDL-LA membrane. The chondrocyte cytocompatibility test and MTT assays indicated that the alginate-amino acid derivatives modified PDL-LA membranes could promote chondrogenesis. The novel surface treatment method may have potentials for tissue engineering and other biomedical applications.
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Affiliation(s)
- Huiguang Zhu
- Department of Polymer Science, Zhejiang University, Hangzhou, China
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Pelletier S, Hubert P, Payan E, Marchal P, Choplin L, Dellacherie E. Amphiphilic derivatives of sodium alginate and hyaluronate for cartilage repair: rheological properties. JOURNAL OF BIOMEDICAL MATERIALS RESEARCH 2001; 54:102-8. [PMID: 11077408 DOI: 10.1002/1097-4636(200101)54:1<102::aid-jbm12>3.0.co;2-1] [Citation(s) in RCA: 80] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Various amphiphilic derivatives of sodium alginate and hyaluronate were prepared by covalent fixation of long alkyl chains (dodecyl and octadecyl) with various ratios on the polysaccharide backbones via ester functions. In the semidilute regime, aqueous solutions of the resulting compounds exhibited the typical rheological properties of hydrophobically associating polymers: tremendous enhancement of zero shear rate Newtonian viscosity, steep shear-thinning behavior, and formation of physically cross-linked gel-like networks. The influence of the alkyl chain length, its content on the polysaccharide and of the polymer concentration in the solution was well identified. All obtained results are discussed with respect to the schedule of conditions related to materials, which could be used for cartilage repair, such as in synovial fluid viscosupplementation as well as in cartilage replacement. In particular, it is seen that HA-C(12)-5 (hyaluronate substituted with 5% of dodecyl chains) and HA-C(18)-1 (hyaluronate substituted with 1% of octadecyl chains) in a 0.15N NaCl solution at 8 g/L have rheological properties quite similar to those of healthy synovial fluid. On the other hand, the rheological parameters of solutions at 8 g/L in 0.15N NaCl of some of derivatives, such as, for example, AA-C(12)-8 (alginate substituted with 8% of dodecyl chains) or HA-C(18)-2, are well fitted for a use in cartilage repair.
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Affiliation(s)
- S Pelletier
- Laboratoire de Chimie Physique Macromoléculaire, UMR CNRS-INPL 7568, Groupe ENSIC, BP 451, 54001 Nancy Cedex, France
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