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Nguyen DD, Luo LJ, Lai JY. Toward understanding the purely geometric effects of silver nanoparticles on potential application as ocular therapeutics via treatment of bacterial keratitis. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2020; 119:111497. [PMID: 33321598 DOI: 10.1016/j.msec.2020.111497] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/29/2020] [Revised: 08/14/2020] [Accepted: 09/06/2020] [Indexed: 12/22/2022]
Abstract
Understanding a complex interaction between therapeutic nanoparticles and biological entities is crucially important for the development of effective disease treatments in the modern nanopharmaceuticals and nanomedicines. Herein, we present a strategy to thoroughly assess geometrical impacts of silver nanoparticles (AgNPs, one of the most promising nanotherapeutic agents) on their biological activities toward treatment of Staphylococcus aureus (S. aureus)-induced keratitis. Specifically, three types of differently shaped AgNPs including silver nanorods (R-Ag), silver nanotriangles (T-Ag), and silver nanospheres (SAg) are employed and interferences of particle surface area and functionality are eliminated to reflect purely geometric effects. Ocular biocompatibility studies on rabbit corneal keratocytes reveal that SAg is the least cytotoxic agent while R-Ag, because of its strongest cellular uptake, induces highest cytotoxic levels. Moreover, SAg is demonstrated to outperform R-Ag and T-Ag in killing S. aureus, possibly due to a predominance of specific particle density and high-atom-density {111} facets of the SAg when interacting with the bacteria. In contrast, owing to its predominance of sharp-tip effects on vascular endothelial cells, R-Ag can suppress blood vessel development in cornea at a greatest extent. In a rabbit model of S. aureus-induced keratitis, intrastromal administration of the differently shaped AgNPs exhibits critical roles of the particle geometry at comparable conditions (i.e., total surface area and functionality) in attenuating progression of S. aureus-induced keratitis. As a compromise among ocular biocompatibility, anti-bacterial activity, and anti-angiogenic capability, SAg shows as the most effective agent that could repair infectious corneal tissues 1.2 and 4-fold greater than the anisotropic counterparts (R-Ag and T-Ag). These findings therefore suggest a promising strategy for a clear-cut evaluation on geometric effects of therapeutic nanoparticles toward preclinical treatment of eye-related microbial infections.
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Affiliation(s)
- Duc Dung Nguyen
- Graduate Institute of Biomedical Engineering, Chang Gung University, Taoyuan 33302, Taiwan, ROC
| | - Li-Jyuan Luo
- Graduate Institute of Biomedical Engineering, Chang Gung University, Taoyuan 33302, Taiwan, ROC
| | - Jui-Yang Lai
- Graduate Institute of Biomedical Engineering, Chang Gung University, Taoyuan 33302, Taiwan, ROC; Department of Ophthalmology, Chang Gung Memorial Hospital, Linkou, Taoyuan 33305, Taiwan, ROC; Department of Materials Engineering, Ming Chi University of Technology, New Taipei City 24301, Taiwan, ROC; Research Center for Chinese Herbal Medicine, College of Human Ecology, Chang Gung University of Science and Technology, Taoyuan 33303, Taiwan, ROC.
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Purushothaman M, Krishnan PSG, Nayak SK. Synergistic effect of alkyl lactate functional groups on properties of methacrylate polymers. IRANIAN POLYMER JOURNAL 2019. [DOI: 10.1007/s13726-019-00712-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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3
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Amination degree of gelatin is critical for establishing structure-property-function relationships of biodegradable thermogels as intracameral drug delivery systems. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2019; 98:897-909. [DOI: 10.1016/j.msec.2019.01.051] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/05/2018] [Revised: 01/01/2019] [Accepted: 01/11/2019] [Indexed: 12/17/2022]
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Juráňová J. Illuminating the cellular and molecular mechanism of the potential toxicity of methacrylate monomers used in biomaterials. Drug Chem Toxicol 2019; 43:266-278. [DOI: 10.1080/01480545.2018.1488860] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Affiliation(s)
- Jana Juráňová
- Department of Medical Chemistry and Biochemistry, Faculty of Medicine and Dentistry, Palacky University, Hněvotínská 3, Olomouc, Czech Republic
- Faculty of Medicine and Dentistry, Institute of Molecular and Translational Medicine, Palacky University, Hněvotínská 5, Olomouc, Czech Republic
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Ocular biocompatibility of gelatin microcarriers functionalized with oxidized hyaluronic acid. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2017; 72:150-159. [DOI: 10.1016/j.msec.2016.11.067] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/18/2016] [Revised: 10/26/2016] [Accepted: 11/17/2016] [Indexed: 11/21/2022]
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Luo LJ, Lai JY. The role of alkyl chain length of monothiol-terminated alkyl carboxylic acid in the synthesis, characterization, and application of gelatin-g-poly(N-isopropylacrylamide) carriers for antiglaucoma drug delivery. Acta Biomater 2017; 49:344-357. [PMID: 27890728 DOI: 10.1016/j.actbio.2016.11.055] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2016] [Revised: 11/14/2016] [Accepted: 11/23/2016] [Indexed: 10/20/2022]
Abstract
To improve ocular bioavailability and extend pharmacological response, this study aims to investigate the role of alkyl chain length of monothiol-terminated alkyl carboxylic acids in the synthesis, characterization, and application of gelatin-g-poly(N-isopropylacrylamide) (GN) biodegradable in situ gelling carriers for antiglaucoma drug delivery. In the presence of mercaptoacetic acid (MAA), mercaptopropionic acid (MPA), mercaptobutyric acid (MBA), or mercaptohexanoic acid (MHA) as a chain transfer agent, the carboxylic end-capped poly(N-isopropylacrylamide) samples were prepared by free radical polymerization technique. Our results showed that with increasing alkyl chain length, the hydrophobicity of thermo-responsive polymer segments significantly increased, mainly due to an increase in CH stretching frequencies. In addition, the greater hydrophobic association favored the decrease in both phase transition temperature and weight loss of GN copolymers, thereby accelerating their temperature-triggered gelation process and retarding the degradation progress under physiological conditions. The benefits from these features allowed the pilocarpine carriers to increase drug payload and extend drug release. Irrespective of carbon number of monothiol-terminated alkyl carboxylic acid, the synthesized GN materials exhibited high tolerance to corneal endothelial cells without any evidence of inhibited proliferation, viability loss, inflammatory stimulation, and functional abnormality, indicating good biocompatibility. Results of clinical observations and histological examinations demonstrated that the therapeutic efficacies in treating glaucomatous damage are in response to in vivo drug release profiles from various intracamerally injected GN carriers. The research findings suggest the influence of alkyl chain length of chain transfer agent-mediated polymer hydrophobicity and degradability on pharmacological bioavailability and action of pilocarpine in a glaucomatous rabbit model. STATEMENT OF SIGNIFICANCE Considering that glaucoma is a chronic disease that requires long-term medical therapy to preserve vision in patients, it is highly desirable to augment pharmacological bioavailability and govern release profile by tuning the properties of drug delivery carriers. For the first time, the present study provide striking evidence that the alkyl chain length of monothiol-terminated alkyl carboxylic acid related to the synthesis of biodegradable in situ gelling copolymers plays a key role in molecular functionalization of intracameral delivery systems for ocular administration and controlled release of antiglaucoma medications. The therapeutic efficacies in treating glaucomatous damage are in response to in vivo pilocarpine release profiles modulated by the carbon number of thermo-responsive polymer segment-mediated carrier hydrophobicity and degradability.
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Chou SF, Luo LJ, Lai JY, Ma DHK. On the importance of Bloom number of gelatin to the development of biodegradable in situ gelling copolymers for intracameral drug delivery. Int J Pharm 2016; 511:30-43. [PMID: 27374201 DOI: 10.1016/j.ijpharm.2016.06.129] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2016] [Revised: 06/14/2016] [Accepted: 06/29/2016] [Indexed: 01/27/2023]
Abstract
To overcome the drawbacks associated with conventional antiglaucoma eye drops, this work demonstrated the feasibility of an effective alternative strategy to administer pilocarpine directly via intracameral injections of drug-containing biodegradable in situ gelling GN copolymers composed of gelatin and poly(N-isopropylacrylamide). Specifically, this study aims to understand the importance of Bloom number of gelatin, a physicochemical parameter, to the development of GN carriers for intracameral drug delivery in glaucoma therapy. Our results showed that both imino acid and triple-helix contents increased with increasing Bloom index from 75-100 to 300. The drug encapsulation efficiency in response to temperature-triggered phase transition in GN copolymers was affected by the Bloom index of gelatin. In addition, the differences in protein secondary structure significantly influenced the degradation rates of GN carriers, which were highly correlated with drug release profiles. The increase in released pilocarpine concentration led to a high intracellular calcium level in rabbit ciliary smooth muscle cell cultures, indicating a beneficial pharmacological response to a drug. Irrespective of Bloom number of gelatin, all carrier materials exhibited excellent in vitro and in vivo biocompatibility with corneal endothelium. In a glaucomatous rabbit model, intracameral injections of pilocarpine-containing GN synthesized from gelatins with various Bloom numbers had different abilities to improve ocular hypertension and induce pupillary constriction, indicating distinct antiglaucoma efficacies due to in vivo drug release. It is concluded that the effects on pharmacological treatment using GN carriers for intracameral pilocarpine administration demonstrate a strong dependence on the Bloom number of gelatin.
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Affiliation(s)
- Shih-Feng Chou
- Institute of Biochemical and Biomedical Engineering, Chang Gung University, Taoyuan, 33302, Taiwan, ROC; Department of Bioengineering, University of Washington, Seattle, WA 98195-5061, USA
| | - Li-Jyuan Luo
- Department of Chemical and Materials Engineering, Chang Gung University, Taoyuan 33302, Taiwan, ROC
| | - Jui-Yang Lai
- Institute of Biochemical and Biomedical Engineering, Chang Gung University, Taoyuan, 33302, Taiwan, ROC; Biomedical Engineering Research Center, Chang Gung University, Taoyuan 33302, Taiwan, ROC; Molecular Medicine Research Center, Chang Gung University, Taoyuan 33302, Taiwan, ROC; Center for Tissue Engineering, Chang Gung Memorial Hospital, Taoyuan 33305, Taiwan, ROC; Department of Ophthalmology, Chang Gung Memorial Hospital, Taoyuan 33305, Taiwan, ROC.
| | - David Hui-Kang Ma
- Center for Tissue Engineering, Chang Gung Memorial Hospital, Taoyuan 33305, Taiwan, ROC; Department of Ophthalmology, Chang Gung Memorial Hospital, Taoyuan 33305, Taiwan, ROC; Department of Chinese Medicine, Chang Gung University, Taoyuan 33302, Taiwan, ROC
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Lai JY. Hyaluronic acid concentration-mediated changes in structure and function of porous carriers for corneal endothelial cell sheet delivery. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2015; 59:411-419. [PMID: 26652391 DOI: 10.1016/j.msec.2015.10.050] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/12/2015] [Revised: 09/27/2015] [Accepted: 10/15/2015] [Indexed: 01/15/2023]
Abstract
In this study, the effects of hyaluronic acid (HA) concentrations (0.05-1.25wt.%) on the properties of porous carriers for corneal endothelial tissue engineering were investigated. The pore size and porosity gradually increased with decreasing solid content. However, at relatively low HA concentration (i.e., 0.05wt.%), the material samples contained small interior pores and a dense surface skin layer, probably due to no gas bubble effect on the stirring processing of porous microstructures of freeze-dried polysaccharide hydrogels. The carriers prepared from 0.25wt.% HA solution had the highest freezable water content and oxygen and glucose permeability among the samples evaluated. Results of cell viability assays and quantitative real-time reverse transcription polymerase chain reaction analyses showed that the HA concentration-related alteration of porous microstructure dictates the compatibility of biopolymer carriers with corneal endothelial cell (CEC) cultures. In vivo studies demonstrated that the CEC sheet/HA carrier construct implants are therapeutically efficacious in the reconstruction of endothelial scrape-wounded corneas. It is concluded that the polysaccharide concentration is the major factor for affecting the processing of carriers and their structure and function. Porous hydrogels prepared from 0.25wt.% HA solution are capable of delivering bioengineered CEC sheets to the posterior surface of cornea.
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Affiliation(s)
- Jui-Yang Lai
- Institute of Biochemical and Biomedical Engineering, Chang Gung University, Taoyuan, Taiwan 33302, Republic of China; Biomedical Engineering Research Center, Chang Gung University, Taoyuan, Taiwan 33302, Republic of China; Molecular Medicine Research Center, Chang Gung University, Taoyuan, Taiwan 33302, Republic of China; Center for Tissue Engineering, Chang Gung Memorial Hospital, Taoyuan, Taiwan 33305, Republic of China.
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Lai JY, Cheng HY, Ma DHK. Investigation of Overrun-Processed Porous Hyaluronic Acid Carriers in Corneal Endothelial Tissue Engineering. PLoS One 2015; 10:e0136067. [PMID: 26296087 PMCID: PMC4546624 DOI: 10.1371/journal.pone.0136067] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2015] [Accepted: 07/29/2015] [Indexed: 11/19/2022] Open
Abstract
Hyaluronic acid (HA) is a linear polysaccharide naturally found in the eye and therefore is one of the most promising biomaterials for corneal endothelial regenerative medicine. This study reports, for the first time, the development of overrun-processed porous HA hydrogels for corneal endothelial cell (CEC) sheet transplantation and tissue engineering applications. The hydrogel carriers were characterized to examine their structures and functions. Evaluations of carbodiimide cross-linked air-dried and freeze-dried HA samples were conducted simultaneously for comparison. The results indicated that during the fabrication of freeze-dried HA discs, a technique of introducing gas bubbles in the aqueous biopolymer solutions can be used to enlarge pore structure and prevent dense surface skin formation. Among all the groups studied, the overrun-processed porous HA carriers show the greatest biological stability, the highest freezable water content and glucose permeability, and the minimized adverse effects on ionic pump function of rabbit CECs. After transfer and attachment of bioengineered CEC sheets to the overrun-processed HA hydrogel carriers, the therapeutic efficacy of cell/biopolymer constructs was tested using a rabbit model with corneal endothelial dysfunction. Clinical observations including slit-lamp biomicroscopy, specular microscopy, and corneal thickness measurements showed that the construct implants can regenerate corneal endothelium and restore corneal transparency at 4 weeks postoperatively. Our findings suggest that cell sheet transplantation using overrun-processed porous HA hydrogels offers a new way to reconstruct the posterior corneal surface and improve endothelial tissue function.
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Affiliation(s)
- Jui-Yang Lai
- Institute of Biochemical and Biomedical Engineering, Chang Gung University, Taoyuan, Taiwan, 33302, Republic of China
- Biomedical Engineering Research Center, Chang Gung University, Taoyuan, Taiwan, 33302, Republic of China
- Molecular Medicine Research Center, Chang Gung University, Taoyuan, Taiwan, 33302, Republic of China
- * E-mail:
| | - Hsiao-Yun Cheng
- Molecular Medicine Research Center, Chang Gung University, Taoyuan, Taiwan, 33302, Republic of China
| | - David Hui-Kang Ma
- Limbal Stem Cell Laboratory, Department of Ophthalmology, Chang Gung Memorial Hospital, Taoyuan, Taiwan, 33305, Republic of China
- Department of Chinese Medicine, Chang Gung University, Taoyuan, Taiwan, 33302, Republic of China
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Lai JY. Carbodiimide cross-linking of amniotic membranes in the presence of amino acid bridges. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2015; 51:28-36. [DOI: 10.1016/j.msec.2015.02.021] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/06/2014] [Revised: 01/02/2015] [Accepted: 02/09/2015] [Indexed: 10/24/2022]
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Photo-cross-linking of amniotic membranes for limbal epithelial cell cultivation. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2014; 45:313-9. [DOI: 10.1016/j.msec.2014.09.001] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/23/2014] [Revised: 07/27/2014] [Accepted: 09/01/2014] [Indexed: 11/15/2022]
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Lai JY, Wang PR, Luo LJ, Chen ST. Stabilization of collagen nanofibers with L-lysine improves the ability of carbodiimide cross-linked amniotic membranes to preserve limbal epithelial progenitor cells. Int J Nanomedicine 2014; 9:5117-30. [PMID: 25395849 PMCID: PMC4227622 DOI: 10.2147/ijn.s69689] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
To overcome the drawbacks associated with limited cross-linking efficiency of carbodiimide modified amniotic membrane, this study investigated the use of l-lysine as an additional amino acid bridge to enhance the stability of a nanofibrous tissue matrix for a limbal epithelial cell culture platform. Results of ninhydrin assays and zeta potential measurements showed that the amount of positively charged amino acid residues incorporated into the tissue collagen chains is highly correlated with the l-lysine-pretreated concentration. The cross-linked structure and hydrophilicity of amniotic membrane scaffolding materials affected by the lysine molecular bridging effects were determined. With an increase in the l-lysine-pretreated concentration from 1 to 30 mM, the cross-linking density was significantly increased and water content was markedly decreased. The variations in resistance to thermal denaturation and enzymatic degradation were in accordance with the number of cross-links per unit mass of amniotic membrane, indicating l-lysine-modulated stabilization of collagen molecules. It was also noteworthy that the carbodiimide cross-linked tissue samples prepared using a relatively high l-lysine-pretreated concentration (ie, 30 mM) appeared to have decreased light transmittance and biocompatibility, probably due to the influence of a large nanofiber size and a high charge density. The rise in stemness gene and protein expression levels was dependent on improved cross-link formation, suggesting the crucial role of amino acid bridges in constructing suitable scaffolds to preserve limbal progenitor cells. It is concluded that mild to moderate pretreatment conditions (ie, 3–10 mM l-lysine) can provide a useful strategy to assist in the development of carbodiimide cross-linked amniotic membrane as a stable stem cell niche for corneal epithelial tissue engineering.
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Affiliation(s)
- Jui-Yang Lai
- Institute of Biochemical and Biomedical Engineering, Chang Gung University, Taoyuan, Taiwan, Republic of China ; Biomedical Engineering Research Center, Chang Gung University, Taoyuan, Taiwan, Republic of China ; Molecular Medicine Research Center, Chang Gung University, Taoyuan, Taiwan, Republic of China
| | - Pei-Ran Wang
- Institute of Biochemical and Biomedical Engineering, Chang Gung University, Taoyuan, Taiwan, Republic of China
| | - Li-Jyuan Luo
- Institute of Biochemical and Biomedical Engineering, Chang Gung University, Taoyuan, Taiwan, Republic of China
| | - Si-Tan Chen
- Institute of Biochemical and Biomedical Engineering, Chang Gung University, Taoyuan, Taiwan, Republic of China
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Biofunctionalization of gelatin microcarrier with oxidized hyaluronic acid for corneal keratocyte cultivation. Colloids Surf B Biointerfaces 2014; 122:277-286. [DOI: 10.1016/j.colsurfb.2014.07.009] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2014] [Revised: 07/07/2014] [Accepted: 07/08/2014] [Indexed: 12/22/2022]
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Lai JY. Effect of chemical composition on corneal tissue response to photopolymerized materials comprising 2-hydroxyethyl methacrylate and acrylic acid. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2014; 34:334-40. [DOI: 10.1016/j.msec.2013.09.026] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/05/2013] [Revised: 09/08/2013] [Accepted: 09/20/2013] [Indexed: 10/26/2022]
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Lai JY. Interrelationship between cross-linking structure, molecular stability, and cytocompatibility of amniotic membranes cross-linked with glutaraldehyde of varying concentrations. RSC Adv 2014. [DOI: 10.1039/c4ra01930j] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Chemical cross-linker concentration has a marked influence on the interrelationship between cross-linking structure, molecular stability, and cytocompatibility of a glutaraldehyde-treated amniotic membrane for a limbal stem cell niche.
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Affiliation(s)
- Jui-Yang Lai
- Institute of Biochemical and Biomedical Engineering
- Chang Gung University
- Taoyuan 33302, Republic of China
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