1
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Liao J, Zhou Y, Zhao X, Hou B, Zhang J, Huang H. Chitin microspheres: From fabrication to applications. Carbohydr Polym 2024; 329:121773. [PMID: 38286547 DOI: 10.1016/j.carbpol.2023.121773] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2023] [Revised: 12/28/2023] [Accepted: 12/29/2023] [Indexed: 01/31/2024]
Abstract
Chitin microspheres (CMs) have attracted increasing attention due to their biocompatibility, uniform size and shape, large surface area, and porous structure. Considerable research efforts have been focused on developing CMs and promoting their applications in various areas. In this context, this review aims to describe the most recent progress in the fabrication and application of CMs. Different routes that can be used to prepare CMs, such as the drip method and the emulsion method, are emphatically introduced. Moreover, the applications of CMs as drug delivery systems, wound dressings, three-dimensional (3D) scaffolds, water purification, and functional supporting materials in the fields of biomedicine, tissue engineering, environmental protection, and energy storage are also highlighted. We hope this review can provide a comprehensive and useful database for further innovation of CMs.
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Affiliation(s)
- Jing Liao
- College of Food and Biological Engineering, Chengdu University, Chengdu 610106, China; Meat Processing Key Laboratory of Sichuan Province, Chengdu University, Chengdu 610106, China.
| | - Yuhang Zhou
- College of Food and Biological Engineering, Chengdu University, Chengdu 610106, China
| | - Xingyue Zhao
- College of Food and Biological Engineering, Chengdu University, Chengdu 610106, China
| | - Bo Hou
- College of Food and Biological Engineering, Chengdu University, Chengdu 610106, China
| | - Jiamin Zhang
- Meat Processing Key Laboratory of Sichuan Province, Chengdu University, Chengdu 610106, China.
| | - Huihua Huang
- School of Food Science and Engineering, South China University of Technology, Guangzhou 510641, China.
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2
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Weng J, Durand A, Desobry S. Chitosan-Based Particulate Carriers: Structure, Production and Corresponding Controlled Release. Pharmaceutics 2023; 15:1455. [PMID: 37242694 PMCID: PMC10221392 DOI: 10.3390/pharmaceutics15051455] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2023] [Revised: 04/30/2023] [Accepted: 05/04/2023] [Indexed: 05/28/2023] Open
Abstract
The state of the art in the use of chitosan (CS) for preparing particulate carriers for drug delivery applications is reviewed. After evidencing the scientific and commercial potentials of CS, the links between targeted controlled activity, the preparation process and the kinetics of release are detailed, focusing on two types of particulate carriers: matrix particles and capsules. More precisely, the relationship between the size/structure of CS-based particles as multifunctional delivery systems and drug release kinetics (models) is emphasized. The preparation method and conditions greatly influence particle structure and size, which affect release properties. Various techniques available for characterizing particle structural properties and size distribution are reviewed. CS particulate carriers with different structures can achieve various release patterns, including zero-order, multi-pulsed, and pulse-triggered. Mathematical models have an unavoidable role in understanding release mechanisms and their interrelationships. Moreover, models help identify the key structural characteristics, thus saving experimental time. Furthermore, by investigating the close relation between preparation process parameters and particulate structural characteristics as well as their effect on release properties, a novel "on-demand" strategy for the design of drug delivery devices may be developed. This reverse strategy involves designing the production process and the related particles' structure based on the targeted release pattern.
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Affiliation(s)
- Jiaqi Weng
- Université de Lorraine, LIBio, F-54000 Nancy, France;
- Université de Lorraine, CNRS, LCPM, F-54000 Nancy, France;
| | - Alain Durand
- Université de Lorraine, CNRS, LCPM, F-54000 Nancy, France;
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3
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Yang F, Wang F, Mazahreh J, Hu X. Ultrasound-assisted air-jet spinning of silk fibroin-soy protein nanofiber composite biomaterials. ULTRASONICS SONOCHEMISTRY 2023; 94:106341. [PMID: 36848702 PMCID: PMC9984895 DOI: 10.1016/j.ultsonch.2023.106341] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/23/2022] [Revised: 01/27/2023] [Accepted: 02/17/2023] [Indexed: 05/28/2023]
Abstract
Ultrasound utilizes a non-radiation technology that can meet modern standards to gain access to cheap, reliable and sustainable modern energy. Ultrasound technology can be implemented in the field of biomaterials for its exceptional potential in controlling the shape of nanomaterials. This study presents the first example of the production of soy and silk fibroin protein composite nanofibers in various ratios via combining ultrasonic technology with air-spray spinning. Characterization of ultrasonic spun nanofibers was performed by scanning electron microscopy (SEM), Fourier-transform infrared spectroscopy (FTIR), X-ray powder diffraction (XRD), differential scanning calorimetry (DSC), thermogravimetric (TG) analysis, water contact angle, water retention, enzymatic degradation, and cytotoxicity assays. The effects that adjustments on the ultrasonic time have on the surface morphology, structures, thermal properties, hydrophilicity, water-uptake, bio-enzyme degradability, mechanical properties, and cytocompatibility of the material were examined. It was discovered that as the sonication time increased from 0 to 180 min, the beading phenomenon disappeared, forming nanofibers with uniform diameter and porosity; while the content of β-sheet crystals in the composites and their thermal stability gradually increased, the materials glass transition temperature decreased, and preferred mechanical properties were obtained. Additional studies show that the hydrophilicity, water retention capacity and enzymatic degradation rate were also enhanced by ultrasound, providing a favorable environment for cell attachment and proliferation. This study highlights the experimental and theoretical methods for ultrasound assisted air-jet spinning of biopolymer nanofibrous materials with tunable properties and high biocompatibility, which provide a wide range of applications in wound dressings and drug-carrying systems. This work shows great potential for a direct road to sustainable development of protein based fibers in the industry, thus promoting economic growth, and improving the health of the general population and well-being of wounded patients worldwide.
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Affiliation(s)
- Futian Yang
- Center of Analysis and Testing, Nanjing Normal University, Nanjing 210023, PR China; School of Chemistry and Materials Science, Nanjing Normal University Jiangsu, Nanjing 210023, PR China
| | - Fang Wang
- Center of Analysis and Testing, Nanjing Normal University, Nanjing 210023, PR China; School of Chemistry and Materials Science, Nanjing Normal University Jiangsu, Nanjing 210023, PR China.
| | - Janine Mazahreh
- Department of Physics and Astronomy, Rowan University, Glassboro, NJ 08028, USA; Department of Chemistry and Biochemistry, Rowan University, Glassboro, NJ 08028, USA
| | - Xiao Hu
- Department of Physics and Astronomy, Rowan University, Glassboro, NJ 08028, USA; Department of Molecular and Cellular Biosciences, Rowan University, Glassboro, NJ 08028, USA.
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4
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Lau NC, Lai YC, Chen DW, Cheng KW. Antibacterial Activity Studies of 3D-Printing Polyetheretherketone Substrates with Surface Growth of 2D TiO 2/ZnO Rodlike Arrays. ACS OMEGA 2022; 7:9559-9572. [PMID: 35350327 PMCID: PMC8945105 DOI: 10.1021/acsomega.1c06931] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/07/2021] [Accepted: 02/24/2022] [Indexed: 06/14/2023]
Abstract
Heterogeneous metal implants have been applied in clinical treatments of skeletal wounds, but their low antibacterial properties and the possibility of a release of metal ions may have harmful influences on the human body. Therefore, a polymer implant with low cost, high safety, an elastic modulus similar to that of human bone, and a good antibacterial property must be produced for orthopedic treatments. In this study, the surface of a 3D-printed polyetheretherketone (PEEK) disk was grown with ZnO/TiO2 rodlike arrays using a chemical bath deposition. X-ray diffraction patterns and transmission electron microscopy images showed that TiO2/ZnO rodlike arrays were deposited onto the PEEK substrate. With the direct absorption of antibiotic agents onto the surface of TiO2/ZnO/PEEK samples, their antibacterial performances greater than the values of minimum inhibitory concentration required to inhibit the growth of 90% of Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus) remained for around 10 days. The concentration of Zn2+ ions in a buffer solution is reduced with the coating of a TiO2 layer on a ZnO rodlike array. The sample with absorption from a mixture containing ampicillin and vancomycin salts with a weight ratio of 1:1 had the best inhibitory effect on the growth of E. coli and S. aureus.
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Affiliation(s)
- Ngi-Chiong Lau
- Department
of Chemical and Materials Engineering, Chang
Gung University, Taoyuan 33302, Taiwan
- Department
of Orthopedic Surgery, Chang Gung Memorial
Hospital, Keelung Branch, Keelung 333, Taiwan
- College
of Medicine, Chang Gung University, Taoyuan 33302, Taiwan
| | - Yin-Cheng Lai
- Department
of Chemical and Materials Engineering, Chang
Gung University, Taoyuan 33302, Taiwan
| | - Dave W. Chen
- Department
of Orthopedic Surgery, Chang Gung Memorial
Hospital, Keelung Branch, Keelung 333, Taiwan
- College
of Medicine, Chang Gung University, Taoyuan 33302, Taiwan
| | - Kong-Wei Cheng
- Department
of Chemical and Materials Engineering, Chang
Gung University, Taoyuan 33302, Taiwan
- Department
of Orthopedic Surgery, Chang Gung Memorial
Hospital, Keelung Branch, Keelung 333, Taiwan
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5
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Cai B, Gu H, Wang F, Printon K, Gu Z, Hu X. Ultrasound regulated flexible protein materials: Fabrication, structure and physical-biological properties. ULTRASONICS SONOCHEMISTRY 2021; 79:105800. [PMID: 34673337 PMCID: PMC8560629 DOI: 10.1016/j.ultsonch.2021.105800] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/03/2021] [Revised: 10/14/2021] [Accepted: 10/15/2021] [Indexed: 05/03/2023]
Abstract
Ultrasound can be used in the biomaterial field due to its high efficiency, easy operation, no chemical treatment, repeatability and high level of control. In this work, we demonstrated that ultrasound is able to quickly regulate protein structure at the solution assembly stage to obtain the designed properties of protein-based materials. Silk fibroin proteins dissolved in a formic acid-CaCl2 solution system were treated in an ultrasound with varying times and powers. By altering these variables, the silks physical properties and structures can be fine-tuned and the results were investigated with Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM), differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), dynamic mechanical analysis (DMA), gas permeability and water contact angle measurements. Ultrasonic treatment aids the interactions between the calcium ions and silk molecular chains which leads to increased amounts of intermolecular β-sheets and α-helix. This unique structural change caused the silk film to be highly insoluble in water while also inducing a hydrophilic swelling property. The ultrasound-regulated silk materials also showed higher thermal stability, better biocompatibility and breathability, and favorable mechanical strength and flexibility. It was also possible to tune the enzymatic degradation rate and biological response (cell growth and proliferation) of protein materials by changing ultrasound parameters. This study provides a unique physical and non-contact material processing method for the wide applications of protein-based biomaterials.
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Affiliation(s)
- Bowen Cai
- Center of Analysis and Testing, Nanjing Normal University, Nanjing 210023, China; School of Chemistry and Materials Science, Nanjing Normal University, Nanjing 210023, China
| | - Hanling Gu
- Center of Analysis and Testing, Nanjing Normal University, Nanjing 210023, China; School of Chemistry and Materials Science, Nanjing Normal University, Nanjing 210023, China
| | - Fang Wang
- Center of Analysis and Testing, Nanjing Normal University, Nanjing 210023, China; School of Chemistry and Materials Science, Nanjing Normal University, Nanjing 210023, China.
| | - Kyle Printon
- Department of Physics and Astronomy, Rowan University, Glassboro, NJ 08028, USA; Department of Biomedical Engineering, Rowan University, Glassboro, NJ 08028, USA
| | - Zhenggui Gu
- School of Chemistry and Materials Science, Nanjing Normal University, Nanjing 210023, China
| | - Xiao Hu
- Department of Physics and Astronomy, Rowan University, Glassboro, NJ 08028, USA; Department of Biomedical Engineering, Rowan University, Glassboro, NJ 08028, USA; Department of Molecular and Cellular Biosciences, Rowan University, Glassboro, NJ 08028, USA.
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6
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Ao H, Li HW, Lu LK, Fu JX, Han MH, Guo YF, Wang XT. Sensitive Tumor Cell Line for Annonaceous Acetogenins and High Therapeutic Efficacy at a Low Dose for Choriocarcinoma Therapy. J Biomed Nanotechnol 2021; 17:2062-2070. [PMID: 34706806 DOI: 10.1166/jbn.2021.3175] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Annonaceous acetogenins (ACGs) have attracted much attention because of excellent antitumor activity. However, the lack of selectivity and the accompanying serious toxicity have eventually prevented ACGs from entering clinical application. To decrease the side effects of ACGs, the cytotoxicity of ACGs on 10 types of tumor cell lines was investigated by the 3-(4,5-dimethylthiazol-2-yl)-5-(3-carboxymethoxyphenyl)-2-(4-sulfophenyl)-2H-tetrazolium (MTS) test to identify one that was very sensitive to ACGs. Meanwhile, ACGs nanoparticles (ACGs-NPs) were prepared using poloxamer 188 (P188) as an excipient so as to solve the problem of poor solubility and the in vivo delivery of ACGs. ACG-NPs were 163.9±2.5 nm in diameter, negatively charged, and spherical with a high drug loading content (DLC) of 44.9±1.2%. MTS assays demonstrated that ACGs had strong cytotoxicity against JEG-3, HeLa, SiHa, MCF-7, A375, A2058, A875, U-118MG, LN- 229, and A431 cells, among which JEG-3 cell line was extremely sensitive to ACGs with a 50% inhibitory concentration (IC50) value of 0.26 ng/mL, a very encouraging discovery. ACGs-NPs demonstrated very good dose-dependent antitumor efficacy in a broad range of 45?1200 μg/kg on JEG-3 tumor-bearing mice. At a very low dose (1200 μg/kg), ACGs-NPs achieved a high tumor inhibition rate (TIR) of 77.6% through oral administration, displaying a significant advantage over paclitaxel (PTX) injections that are currently used as first-line anti-choriocarcinoma drugs. In the acute toxicity study, the half lethal dose (LD50) of ACGs-NPs was 135.5 mg/kg, which was over 100 times as of the effective antitumor dose, indicating good safety of ACGs-NPs. ACGs-NPs show promise as a new type of and potent anti-choriocarcinoma drug in the future.
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Affiliation(s)
- Hui Ao
- Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences & Peking Union Medical College, Haidian District, Beijing, 100193, PR China
| | - Hao-Wen Li
- Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences & Peking Union Medical College, Haidian District, Beijing, 100193, PR China
| | - Li-Kang Lu
- Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences & Peking Union Medical College, Haidian District, Beijing, 100193, PR China
| | - Jing-Xin Fu
- Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences & Peking Union Medical College, Haidian District, Beijing, 100193, PR China
| | - Mei-Hua Han
- Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences & Peking Union Medical College, Haidian District, Beijing, 100193, PR China
| | - Yi-Fei Guo
- Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences & Peking Union Medical College, Haidian District, Beijing, 100193, PR China
| | - Xiang-Tao Wang
- Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences & Peking Union Medical College, Haidian District, Beijing, 100193, PR China
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7
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Halevas E, Kokotidou C, Zaimai E, Moschona A, Lialiaris E, Mitraki A, Lialiaris T, Pantazaki A. Evaluation of the Hemocompatibility and Anticancer Potential of Poly( ε-Caprolactone) and Poly(3-Hydroxybutyrate) Microcarriers with Encapsulated Chrysin. Pharmaceutics 2021; 13:109. [PMID: 33467090 PMCID: PMC7831015 DOI: 10.3390/pharmaceutics13010109] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2020] [Revised: 01/12/2021] [Accepted: 01/14/2021] [Indexed: 01/18/2023] Open
Abstract
In this work, novel chrysin-loaded poly(ε-caprolactone) and poly(3-hydroxybutyrate) microcarriers were synthesized according to a modified oil-in-water single emulsion/solvent evaporation method, utilizing poly(vinyl alcohol) surfactant as stabilizer and dispersing agent for the emulsification, and were evaluated for their physico-chemical and morphological properties, loading capacity and entrapment efficiency and in vitro release of their load. The findings suggest that the novel micro-formulations possess a spherical and relatively wrinkled structure with sizes ranging between 2.4 and 24.7 µm and a highly negative surface charge with z-potential values between (-18.1)-(-14.1) mV. The entrapment efficiency of chrysin in the poly(ε-caprolactone) and poly(3-hydroxybutyrate) microcarriers was estimated to be 58.10% and 43.63%, whereas the loading capacity was found to be 3.79% and 15.85%, respectively. The average release percentage of chrysin was estimated to be 23.10% and 18.01%, respectively. The novel micromaterials were further biologically evaluated for their hemolytic activity through hemocompatibility studies over a range of hematological parameters and cytoxicity against the epithelial human breast cancer cell line MDA-MB 231. The poly(ε-caprolactone) and poly(3-hydroxybutyrate) microcarriers reached an IC50 value with an encapsulated chrysin content of 149.19 µM and 312.18 µM, respectively, and showed sufficient blood compatibility displaying significantly low (up to 2%) hemolytic percentages at concentrations between 5 and 500 µg·mL-1.
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Affiliation(s)
- Eleftherios Halevas
- Institute of Biosciences & Applications, National Centre for Scientific Research “Demokritos”, 15310 Athens, Greece
- Laboratory of Biochemistry, Department of Chemistry, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece;
| | - Chrysoula Kokotidou
- Department of Materials Science and Technology, University of Crete, Voutes Campus, 70013 Heraklion, Greece; (C.K.); (A.M.)
- Institute for Electronic Structure and Laser FORTH, N. Plastira 100, 70013 Heraklion, Greece
| | - Elda Zaimai
- Laboratory of Biochemistry, Department of Chemistry, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece;
| | - Alexandra Moschona
- Laboratory of Organic Chemistry, Department of Chemical Engineering, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece;
- Laboratory of Natural Resources and Renewable Energies, Chemical Process and Energy Resources Institute, Centre for Research and Technology-Hellas (CERTH), 6th km Harilaou-Thermis, 57001 Thermi, Greece
| | - Efstratios Lialiaris
- Laboratory of Genetics, Medical School, Democritus University of Thrace, 68100 Alexandroupolis, Greece; (E.L.); (T.L.)
| | - Anna Mitraki
- Department of Materials Science and Technology, University of Crete, Voutes Campus, 70013 Heraklion, Greece; (C.K.); (A.M.)
- Institute for Electronic Structure and Laser FORTH, N. Plastira 100, 70013 Heraklion, Greece
| | - Theodore Lialiaris
- Laboratory of Genetics, Medical School, Democritus University of Thrace, 68100 Alexandroupolis, Greece; (E.L.); (T.L.)
| | - Anastasia Pantazaki
- Laboratory of Biochemistry, Department of Chemistry, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece;
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8
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Jemni-Damer N, Guedan-Duran A, Fuentes-Andion M, Serrano-Bengoechea N, Alfageme-Lopez N, Armada-Maresca F, Guinea GV, Pérez-Rigueiro J, Rojo F, Gonzalez-Nieto D, Kaplan DL, Panetsos F. Biotechnology and Biomaterial-Based Therapeutic Strategies for Age-Related Macular Degeneration. Part I: Biomaterials-Based Drug Delivery Devices. Front Bioeng Biotechnol 2020; 8:549089. [PMID: 33224926 PMCID: PMC7670958 DOI: 10.3389/fbioe.2020.549089] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2020] [Accepted: 10/06/2020] [Indexed: 12/22/2022] Open
Abstract
Age-related Macular Degeneration (AMD) is an up-to-date untreatable chronic neurodegenerative eye disease of multifactorial origin, and the main causes of blindness in over 65 years old people. It is characterized by a slow progression and the presence of a multitude of factors, highlighting those related to diet, genetic heritage and environmental conditions, present throughout each of the stages of the illness. Current therapeutic approaches, mainly consisting of intraocular drug delivery, are only used for symptoms relief and/or to decelerate the progression of the disease. Furthermore, they are overly simplistic and ignore the complexity of the disease and the enormous differences in the symptomatology between patients. Due to the wide impact of the AMD and the up-to-date absence of clinical solutions, the development of biomaterials-based approaches for a personalized and controlled delivery of therapeutic drugs and biomolecules represents the main challenge for the defeat of this neurodegenerative disease. Here we present a critical review of the available and under development AMD therapeutic approaches, from a biomaterials and biotechnological point of view. We highlight benefits and limitations and we forecast forthcoming alternatives based on novel biomaterials and biotechnology methods. In the first part we expose the physiological and clinical aspects of the disease, focusing on the multiple factors that give origin to the disorder and highlighting the contribution of these factors to the triggering of each step of the disease. Then we analyze available and under development biomaterials-based drug-delivery devices (DDD), taking into account the anatomical and functional characteristics of the healthy and ill retinal tissue.
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Affiliation(s)
- Nahla Jemni-Damer
- Neuro-Computing and Neuro-Robotics Research Group, Complutense University of Madrid, Madrid, Spain.,Innovation Group, Institute for Health Research San Carlos Clinical Hospital (IdISSC), Madrid, Spain
| | - Atocha Guedan-Duran
- Neuro-Computing and Neuro-Robotics Research Group, Complutense University of Madrid, Madrid, Spain.,Innovation Group, Institute for Health Research San Carlos Clinical Hospital (IdISSC), Madrid, Spain.,Department of Biomedical Engineering, Tufts University, Medford, MA, United States
| | - María Fuentes-Andion
- Neuro-Computing and Neuro-Robotics Research Group, Complutense University of Madrid, Madrid, Spain.,Innovation Group, Institute for Health Research San Carlos Clinical Hospital (IdISSC), Madrid, Spain
| | - Nora Serrano-Bengoechea
- Neuro-Computing and Neuro-Robotics Research Group, Complutense University of Madrid, Madrid, Spain.,Innovation Group, Institute for Health Research San Carlos Clinical Hospital (IdISSC), Madrid, Spain.,Silk Biomed SL, Madrid, Spain
| | - Nuria Alfageme-Lopez
- Neuro-Computing and Neuro-Robotics Research Group, Complutense University of Madrid, Madrid, Spain.,Innovation Group, Institute for Health Research San Carlos Clinical Hospital (IdISSC), Madrid, Spain.,Silk Biomed SL, Madrid, Spain
| | | | - Gustavo V Guinea
- Silk Biomed SL, Madrid, Spain.,Center for Biomedical Technology, Universidad Politécnica de Madrid, Madrid, Spain.,Department of Material Science, Civil Engineering Superior School, Universidad Politécnica de Madrid, Madrid, Spain.,Biomedical Research Networking Center in Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), Madrid, Spain
| | - José Pérez-Rigueiro
- Silk Biomed SL, Madrid, Spain.,Center for Biomedical Technology, Universidad Politécnica de Madrid, Madrid, Spain.,Department of Material Science, Civil Engineering Superior School, Universidad Politécnica de Madrid, Madrid, Spain.,Biomedical Research Networking Center in Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), Madrid, Spain
| | - Francisco Rojo
- Silk Biomed SL, Madrid, Spain.,Center for Biomedical Technology, Universidad Politécnica de Madrid, Madrid, Spain.,Department of Material Science, Civil Engineering Superior School, Universidad Politécnica de Madrid, Madrid, Spain.,Biomedical Research Networking Center in Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), Madrid, Spain
| | - Daniel Gonzalez-Nieto
- Silk Biomed SL, Madrid, Spain.,Center for Biomedical Technology, Universidad Politécnica de Madrid, Madrid, Spain.,Biomedical Research Networking Center in Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), Madrid, Spain
| | - David L Kaplan
- Department of Biomedical Engineering, Tufts University, Medford, MA, United States
| | - Fivos Panetsos
- Neuro-Computing and Neuro-Robotics Research Group, Complutense University of Madrid, Madrid, Spain.,Innovation Group, Institute for Health Research San Carlos Clinical Hospital (IdISSC), Madrid, Spain.,Silk Biomed SL, Madrid, Spain
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9
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Baino F, Kargozar S. Regulation of the Ocular Cell/Tissue Response by Implantable Biomaterials and Drug Delivery Systems. Bioengineering (Basel) 2020; 7:E65. [PMID: 32629806 PMCID: PMC7552708 DOI: 10.3390/bioengineering7030065] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2020] [Revised: 06/26/2020] [Accepted: 06/28/2020] [Indexed: 01/31/2023] Open
Abstract
Therapeutic advancements in the treatment of various ocular diseases is often linked to the development of efficient drug delivery systems (DDSs), which would allow a sustained release while maintaining therapeutic drug levels in the target tissues. In this way, ocular tissue/cell response can be properly modulated and designed in order to produce a therapeutic effect. An ideal ocular DDS should encapsulate and release the appropriate drug concentration to the target tissue (therapeutic but non-toxic level) while preserving drug functionality. Furthermore, a constant release is usually preferred, keeping the initial burst to a minimum. Different materials are used, modified, and combined in order to achieve a sustained drug release in both the anterior and posterior segments of the eye. After giving a picture of the different strategies adopted for ocular drug release, this review article provides an overview of the biomaterials that are used as drug carriers in the eye, including micro- and nanospheres, liposomes, hydrogels, and multi-material implants; the advantages and limitations of these DDSs are discussed in reference to the major ocular applications.
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Affiliation(s)
- Francesco Baino
- Department of Applied Science and Technology, Institute of Materials Physics and Engineering, Politecnico di Torino, 10129 Turin, Italy
| | - Saeid Kargozar
- Tissue Engineering Research Group (TERG), Department of Anatomy and Cell Biology, School of Medicine, Mashhad University of Medical Sciences, Mashhad 917794-8564, Iran;
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10
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Zhang W, Zhao Y, Xu L, Song X, Yuan X, Sun J, Zhang J. Superfine grinding induced amorphization and increased solubility of α-chitin. Carbohydr Polym 2020; 237:116145. [DOI: 10.1016/j.carbpol.2020.116145] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2019] [Revised: 03/05/2020] [Accepted: 03/08/2020] [Indexed: 10/24/2022]
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11
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Rezaei H, Shahrezaee M, Jalali Monfared M, Ghorbani F, Zamanian A, Sahebalzamani M. Mussel-inspired polydopamine induced the osteoinductivity to ice-templating PLGA-gelatin matrix for bone tissue engineering application. Biotechnol Appl Biochem 2020; 68:185-196. [PMID: 32248561 DOI: 10.1002/bab.1911] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2019] [Accepted: 03/10/2020] [Indexed: 11/06/2022]
Abstract
In this study, poly(lactic-co-glycolic acid) (PLGA)-gelatin scaffolds were fabricated using the freeze-casting technique. Polydopamine (PDA) coating was applied on the surface of scaffolds to enhance the hydrophilicity, bioactivity, and cellular behavior of the composite constructs. Further, the synergistic effect of PDA coating and lamellar microstructure of scaffolds was evaluated on the promotion of properties. Based on morphological observations, freeze-casting constructs showed lamellar pore channels while the uniformity and pore size were slightly affected by deposition of PDA. The hydrophilicity and swelling capacity of the scaffolds were assessed using contact angle measurement and phosphate buffered saline absorption ratio. The results indicated a significant increment in water-matrix interactions following surface modification. The evaluation of the biodegradation ratio revealed the higher degree of degradation in PDA-coated samples owing to the presence of hydrophilic functional groups in the chemical structure of PDA. On the other hand, the bioactivity potential of PDA in the simulated body fluid solution confirmed the possibility of using coated constructs as a bone reconstructive substitute. The improvement of cellular attachment and filopodia formation in PDA-contained matrixes was the other benefit of the coating process. Furthermore, cellular proliferation and ALP activity were enhanced after PDA coating. The suggested PDA-coated PLGA-gelatin scaffolds can be applied in bone tissue regeneration.
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Affiliation(s)
- Hessam Rezaei
- Department of Orthopedic Surgery, Faculty of Medicine, AJA University of Medical Science, Tehran, Iran.,Department of Biomedical Engineering, Tehran Science and Research Branch, Islamic Azad University, Tehran, Iran
| | - Mostafa Shahrezaee
- Department of Orthopedic Surgery, Faculty of Medicine, AJA University of Medical Science, Tehran, Iran
| | - Marziyeh Jalali Monfared
- Department of Tissue Engineering and Applied Cell Sciences, School of Advanced Technologies in Medicine, Tehran University of Medical Sciences, Tehran, Iran
| | - Farnaz Ghorbani
- Department of Orthopedics, Shanghai Pudong Hospital, Shanghai Fudan University Pudong Medical Center, Shanghai, China
| | - Ali Zamanian
- Biomaterials Research Group, Department of Nanotechnology and Advanced Materials, Materials and Energy Research Center, Tehran, Iran
| | - Mohammadali Sahebalzamani
- Department of Biomedical Engineering, Tehran Science and Research Branch, Islamic Azad University, Tehran, Iran
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12
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Kang-Mieler JJ, Rudeen KM, Liu W, Mieler WF. Advances in ocular drug delivery systems. Eye (Lond) 2020; 34:1371-1379. [PMID: 32071402 DOI: 10.1038/s41433-020-0809-0] [Citation(s) in RCA: 66] [Impact Index Per Article: 16.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2019] [Revised: 01/21/2020] [Accepted: 02/04/2020] [Indexed: 12/26/2022] Open
Abstract
Recent advances in pharmacological agents have led to successful treatment of a variety of retinal diseases such as neovascular age-related macular degeneration (AMD), diabetic macular oedema (DMO), and retinal vascular occlusions (RVO). These treatments often require repeated drug injections for an extended period of time. To reduce these repeated treatment burdens, minimally invasive drug delivery systems are needed. An ideal therapy should maintain effective levels of drug for the intended duration of treatment following a single application, recognising that a significant number of months of therapy may be required. There are numerous approaches under investigation to improve treatment options. This review will highlight the advantages and limitations of selected drug delivery systems of novel biomaterial implants and depots. The main emphasis will be placed on less invasive, longer acting, sustained release formulations for the treatment of retinal disorders.
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Affiliation(s)
- Jennifer J Kang-Mieler
- Department of Biomedical Engineering, Illinois Institute of Technology, Chicago, IL, 60616, USA.
| | - Kayla M Rudeen
- Department of Biomedical Engineering, Illinois Institute of Technology, Chicago, IL, 60616, USA
| | - Wenqiang Liu
- Department of Biomedical Engineering, Illinois Institute of Technology, Chicago, IL, 60616, USA
| | - William F Mieler
- Department of Ophthalmology and Visual Sciences, University of Illinois at Chicago, Chicago, IL, USA.
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13
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Chao FC, Wu MH, Chen LC, Lin HL, Liu DZ, Ho HO, Sheu MT. Preparation and characterization of chemically TEMPO-oxidized and mechanically disintegrated sacchachitin nanofibers (SCNF) for enhanced diabetic wound healing. Carbohydr Polym 2019; 229:115507. [PMID: 31826505 DOI: 10.1016/j.carbpol.2019.115507] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2019] [Revised: 10/14/2019] [Accepted: 10/18/2019] [Indexed: 11/16/2022]
Abstract
TEMPO-oxidization and mechanical disintegration were utilized to develop sacchachitin nanofibers (SCNF) with a 3D gel structure for being an ideal scaffold. Mechanically disintegrated SCNF (MDSCNF) with NanoLyzer® at 20,000 psi for 5 cycles and TEMPO-oxidized SCNF (TOSCNF) produced with 5.0 and 10.0 mmole NaClO/g SC was designated as SCN5, T050SC, and T100SC, respectively. All 2% MDSCNF suspensions were demonstrated to be in gel form, while all except T100SC of 2% TOSCNF suspensions showed to be wet fiber-like hydrogel. In diabetic wound healing study, both SCN5 and T050SC incorporated in AMPS (2-acrylamide-2-methyl-propane sulfonate)-based wound dressing were showed to accelerate diabetic wound healing forming nearly the same as normal tissues. T050SC/H further provided the healed wound with growth of sweat glands and hair follicles indicating the wound had healed as functional tissue. Conclusively, TEMPO-oxidized SCNF-based hydrogel scaffolds showed greater potentials in tissue regeneration due to its unique physical and chemical properties.
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Affiliation(s)
- Fang-Ching Chao
- School of Pharmacy, College of Pharmacy, Taipei Medical University, Taipei, Taiwan, ROC.
| | - Meng-Huang Wu
- Department of Orthopedics, Taipei Medical University Hospital, Taipei, Taiwan, ROC; Department of Orthopedics, College of Medicine, Taipei Medical University, Taipei, Taiwan, ROC.
| | - Ling-Chun Chen
- Department of Biotechnology and Pharmaceutical Technology, Yuanpei University of Medical Technology, Hsinchu, Taiwan, ROC.
| | - Hong-Liang Lin
- School of Pharmacy, College of Pharmacy, Kaohsiung Medical University, Kaohsiung, Taiwan, ROC.
| | - Der-Zen Liu
- Graduate Institute of Biomedical Materials and Tissue Engineering, College of Biomedical Engineering, Taipei Medical University, Taipei, Taiwan, ROC.
| | - Hsiu-O Ho
- School of Pharmacy, College of Pharmacy, Taipei Medical University, Taipei, Taiwan, ROC.
| | - Ming-Thau Sheu
- School of Pharmacy, College of Pharmacy, Taipei Medical University, Taipei, Taiwan, ROC.
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14
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Silk fibroin-poly(lactic acid) biocomposites: Effect of protein-synthetic polymer interactions and miscibility on material properties and biological responses. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2019; 104:109890. [PMID: 31500018 DOI: 10.1016/j.msec.2019.109890] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/28/2019] [Revised: 06/08/2019] [Accepted: 06/12/2019] [Indexed: 12/22/2022]
Abstract
A protein-polymer blend system based on silkworm silk fibroin (SF) and polylactic acid (PLA) was systematically investigated to understand the interaction and miscibility of proteins and synthetic biocompatible polymers in the macro- and micro-meter scales, which can dramatically control the cell responses and enzyme biodegradation on the biomaterial interface. Silk fibroin, a semicrystalline protein with beta-sheet crystals, provides controllable crystal content and biodegradability; while noncrystallizable PDLLA provides hydrophobicity and thermal stability in the system. Differential scanning calorimetry (DSC) combined with scanning electron microscope (SEM) showed that the morphology of the blend films was uniform on a macroscopic scale, yet with tunable micro-phase patterns at different mixing ratios. Fourier transform infrared analysis (FTIR) revealed that structures of the blend system, such as beta-sheet crystal content, gradually changed with the mixing ratios. All blended samples have better stability than pure SF and PLA samples as evidenced by thermogravimetric analysis. Protease XIV enzymatic study showed that the biodegradability of the blend samples varied with their blending ratios and microscale morphologies. Significantly, the topology of the micro-phase patterns on the blends can promote cell attachment and manipulate the cell growth and proliferation. This study provided a useful platform for understanding the fabrication strategies of protein-synthetic polymer composites that have direct biomedical and green chemistry applications.
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15
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Wu Z, Zhao M, Zhang W, Yang Z, Xu S, Shang Q. Influence of drying processes on the structures, morphology and in vitro release profiles of risperidone-loaded PLGA microspheres. J Microencapsul 2019; 36:21-31. [PMID: 30757946 DOI: 10.1080/02652048.2019.1582723] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
The purpose of this study was to investigate the influences of drying methods on the risperidone (RIS) release profiles of RIS-loaded PLGA microspheres. These microspheres were fabricated with an O/W emulsion solvent evaporation method. The wet microspheres were dried with freeze drying and vacuum drying methods. The microspheres were mono-dispersed spheres with an average diameter of 100 μm. Studies found that drying methods had great influence on the porosity, morphology, and release profiles of RIS-loaded PLGA microspheres. Specifically, the freeze-dried microspheres had higher porosity (78.46 ± 1.64%) than those vacuum-dried ones (52.45 ± 2.68%), and they showed higher RIS release rates (p < 0.05). In the accelerated release tests (45 °C), these microspheres dried under the pressures of 700 mmHg and 200 mmHg gave faster release rates than those ones dried under the pressure of 450 mmHg. Importantly, the accelerated release test (45 °C) had a high correlation with the real-time test (37 °C) (R2 > 0.99). These studies exhibited a significance in the precise preparation of RIS-loaded PLGA microspheres.
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Affiliation(s)
- Zhaoying Wu
- a Chemical and Pharmaceutical Engineering Institute , Hebei University of Science and Technology , Hebei , China
| | - Mengqing Zhao
- a Chemical and Pharmaceutical Engineering Institute , Hebei University of Science and Technology , Hebei , China
| | - Wei Zhang
- a Chemical and Pharmaceutical Engineering Institute , Hebei University of Science and Technology , Hebei , China
| | - Zhao Yang
- a Chemical and Pharmaceutical Engineering Institute , Hebei University of Science and Technology , Hebei , China
| | - Shuxin Xu
- b Tianjin Branch of Suzhou Institute of Biomedical Engineering and Technology, CAS , Tianjin , PR China
| | - Qing Shang
- a Chemical and Pharmaceutical Engineering Institute , Hebei University of Science and Technology , Hebei , China
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16
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Sargin I, Arslan G, Kaya M. Production of magnetic chitinous microcages from ephippia of zooplankton Daphnia longispina and heavy metal removal studies. Carbohydr Polym 2019; 207:200-210. [DOI: 10.1016/j.carbpol.2018.11.072] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2018] [Revised: 11/22/2018] [Accepted: 11/22/2018] [Indexed: 11/28/2022]
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17
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Montroni D, Fermani S, Morellato K, Torri G, Naggi A, Cristofolini L, Falini G. β-Chitin samples with similar microfibril arrangement change mechanical properties varying the degree of acetylation. Carbohydr Polym 2018; 207:26-33. [PMID: 30600008 DOI: 10.1016/j.carbpol.2018.11.069] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2018] [Revised: 11/13/2018] [Accepted: 11/13/2018] [Indexed: 11/27/2022]
Abstract
Chitin is widespread in nature and is increasingly used in synthetic process for the production of new biomaterials. Chitin degree of acetylation, crystalline structure and microfibril arrangement differentiate chemical, physical and mechanical properties. Nevertheless, no information are available on the relationship between the mechanical properties and the degree of acetylation (DA) in chitin samples in which the microfibril arrangement does not change. Here, samples of β-chitin with decreasing DA, up to chitosan, were prepared using the squid pen of Loligo vulgaris. These samples were characterized by CP-MAS NMR spectroscopy, scanning electron microscopy, thermal analyses, synchrotron X-ray fiber diffraction and tensile tests. The results showed a similar microfibril arrangement decreasing the DA, except for the chitosan sample. The mechanical properties showed an increase of the maximum strain and a reduction of the maximum stress and Young's modulus, decreasing the DA. These changes, not linear with the DA, were related to structural changes at molecular structure level. The knowledge deriving from this study is of interest both for the understanding of the mechanical properties of chitinous biological samples, but also for the design and synthesis of new biomacromolecular materials.
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Affiliation(s)
- Devis Montroni
- Department of Chemistry "Giacomo Ciamician", Alma Mater Studiorum - Università di Bologna, via Selmi 2, I-40126, Bologna, Italy
| | - Simona Fermani
- Department of Chemistry "Giacomo Ciamician", Alma Mater Studiorum - Università di Bologna, via Selmi 2, I-40126, Bologna, Italy
| | - Kavin Morellato
- Department of Industrial Engineering (DIN), Alma Mater Studiorum - Università di Bologna, Bologna, Italy
| | - Giangiacomo Torri
- Istituto di Ricerche Chimiche e Biochimiche "G. Ronzoni" Milano, via Giuseppe Colombo 81, 20133, Milano, Italy
| | - Annamaria Naggi
- Istituto di Ricerche Chimiche e Biochimiche "G. Ronzoni" Milano, via Giuseppe Colombo 81, 20133, Milano, Italy
| | - Luca Cristofolini
- Department of Industrial Engineering (DIN), Alma Mater Studiorum - Università di Bologna, Bologna, Italy
| | - Giuseppe Falini
- Department of Chemistry "Giacomo Ciamician", Alma Mater Studiorum - Università di Bologna, via Selmi 2, I-40126, Bologna, Italy.
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18
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Davoodi P, Lee LY, Xu Q, Sunil V, Sun Y, Soh S, Wang CH. Drug delivery systems for programmed and on-demand release. Adv Drug Deliv Rev 2018; 132:104-138. [PMID: 30415656 DOI: 10.1016/j.addr.2018.07.002] [Citation(s) in RCA: 185] [Impact Index Per Article: 30.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2018] [Revised: 05/25/2018] [Accepted: 07/02/2018] [Indexed: 01/06/2023]
Abstract
With the advancement in medical science and understanding the importance of biodistribution and pharmacokinetics of therapeutic agents, modern drug delivery research strives to utilize novel materials and fabrication technologies for the preparation of robust drug delivery systems to combat acute and chronic diseases. Compared to traditional drug carriers, which could only control the release of the agents in a monotonic manner, the new drug carriers are able to provide a precise control over the release time and the quantity of drug introduced into the patient's body. To achieve this goal, scientists have introduced "programmed" and "on-demand" approaches. The former provides delivery systems with a sophisticated architecture to precisely tune the release rate for a definite time period, while the latter includes systems directly controlled by an operator/practitioner, perhaps with a remote device triggering/affecting the implanted or injected drug carrier. Ideally, such devices can determine flexible release pattern and intensify the efficacy of a therapy via controlling time, duration, dosage, and location of drug release in a predictable, repeatable, and reliable manner. This review sheds light on the past and current techniques available for fabricating and remotely controlling drug delivery systems and addresses the application of new technologies (e.g. 3D printing) in this field.
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19
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de Azevedo MDBM, de Melo VHS, Soares CRJ, Miyamoto DM, Katayama RA, Squair PL, Barros CHN, Tasic L. Development and characterisation of polymeric microparticle of poly(d,l-lactic acid) loaded with holmium acetylacetonate. J Microencapsul 2018; 35:281-291. [DOI: 10.1080/02652048.2018.1477843] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
Affiliation(s)
- Mariangela de Burgos M. de Azevedo
- Biotechnology Center, Nuclear and Energy Research Institute (IPEN/CNEN-SP), São Paulo, Brazil
- Biotechnology Center of Amazon, CBA, Manaus – AM, Brazil
| | - Vitor H. S. de Melo
- Biotechnology Center, Nuclear and Energy Research Institute (IPEN/CNEN-SP), São Paulo, Brazil
| | | | - Douglas M. Miyamoto
- Biotechnology Center, Nuclear and Energy Research Institute (IPEN/CNEN-SP), São Paulo, Brazil
| | - Ricardo A. Katayama
- Biotechnology Center, Nuclear and Energy Research Institute (IPEN/CNEN-SP), São Paulo, Brazil
| | - Peterson L. Squair
- Biotechnology Center, Nuclear and Energy Research Institute (IPEN/CNEN-SP), São Paulo, Brazil
| | - Caio H. N. Barros
- Department of Organic Chemistry, Institute of Chemistry, UNICAMP SP, São Paulo, Brazil
| | - Ljubica Tasic
- Department of Organic Chemistry, Institute of Chemistry, UNICAMP SP, São Paulo, Brazil
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20
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Wang X, Cao Y, Yan H. Chlorambucil loaded in mesoporous polymeric microspheres as oral sustained release formulations with enhanced hydrolytic stability. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2018; 91:564-569. [PMID: 30033288 DOI: 10.1016/j.msec.2018.05.078] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/22/2017] [Revised: 04/24/2018] [Accepted: 05/26/2018] [Indexed: 12/30/2022]
Abstract
Chlorambucil, a chemotherapeutic agent, is usually administered orally to treat chronic lymphocytic leukemia and some other types of cancers in regimens of conventional and metronomic chemotherapies. However, the hydrolytic instability of chlorambucil is a major limitation in achieving the optimum therapeutic performance. In this work, mesoporous polymeric microspheres were prepared by free radical suspension copolymerization of methyl acrylate and divinylbenzene in the presence of porogen. Chlorambucil was loaded into the mesoporous polymeric microspheres through adsorption of the drug in aqueous media with high loading capacity up to more than 350 mg/g. Chlorambucil-loaded mesoporous polymeric microspheres showed sustained release property in media simulating gastrointestinal fluids, with nearly zero order release kinetics. Furthermore, the mesoporous polymeric microspheres as carriers greatly stabilized chlorambucil against its hydrolysis. The hydrolyzation percentage of chlorambucil that was adsorbed on the microspheres after incubation for 36 h in media simulating gastrointestinal fluids was less than 10%, while more than 90% of free chlorambucil hydrolyzed after incubation in the same media for 4 h. The chlorambucil-loaded mesoporous polymeric microspheres may be used as oral sustained release formulations, especially as oral formulations for the application in metronomic chemotherapy.
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Affiliation(s)
- Xiuyan Wang
- Key Laboratory of Functional Polymer Materials (Ministry of Education), Institute of Polymer Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
| | - Yanyan Cao
- Key Laboratory of Functional Polymer Materials (Ministry of Education), Institute of Polymer Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
| | - Husheng Yan
- Key Laboratory of Functional Polymer Materials (Ministry of Education), Institute of Polymer Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China; Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300071, China.
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21
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Dadras Chomachayi M, Solouk A, Akbari S, Sadeghi D, Mirahmadi F, Mirzadeh H. Electrospun nanofibers comprising of silk fibroin/gelatin for drug delivery applications: Thyme essential oil and doxycycline monohydrate release study. J Biomed Mater Res A 2018; 106:1092-1103. [PMID: 29210169 DOI: 10.1002/jbm.a.36303] [Citation(s) in RCA: 73] [Impact Index Per Article: 12.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2017] [Revised: 11/19/2017] [Accepted: 11/27/2017] [Indexed: 12/29/2022]
Abstract
In this study, a nanofibrous electrospun substrate based on the silk fibroin (SF) and gelatin (GT) polymers were prepared and evaluated. The SF/GT blended solutions were prepared with various ratios of GT in formic acid and electrospun to obtain bead-free fibers. Results showed that addition of GT to SF increased nanofiber's diameter, bulk hydrophilicity, surface wettability, mass loss percentage, but decreased Young's modulus, tensile strength, and porosity of the SF/GT mats. According to the obtained results, the mat containing 10% of GT was selected as the optimized mat for further studies and loaded with thyme essential oil (TEO) and doxycycline monohydrate (DCMH) as the antibacterial agents. Release studies showed a burst release of TEO from the mat within the first 3 h, while the DCMH had a sustained release during 48 h. In comparison to the TEO-loaded mat, the DCMH-loaded one showed larger inhibition zones against Staphylococcus aureus and Klebsiella pneumoniae bacteria. Meanwhile, cellular studies using mouse fibroblast L929 cells showed excellent cell-compatibility of TEO- and DCMH-loaded mats. © 2018 Wiley Periodicals, Inc. J Biomed Mater Res Part A: 106A: 1092-1103, 2018.
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Affiliation(s)
- Masoud Dadras Chomachayi
- Polymer Engineering and Color Technology Faculty, Amirkabir University of Technology (Tehran Polytechnic), Tehran, Iran
| | - Atefeh Solouk
- Biomedical Engineering Department, Amirkabir University of Technology (Tehran Polytechnic), Tehran, Iran
| | - Somaye Akbari
- Textile Engineering Faculty, Amirkabir University of Technology, (Tehran Polytechnic), Tehran, Iran
| | - Davoud Sadeghi
- Biomedical Engineering Department, Amirkabir University of Technology (Tehran Polytechnic), Tehran, Iran
| | - Fereshteh Mirahmadi
- Biomedical Engineering Department, Amirkabir University of Technology (Tehran Polytechnic), Tehran, Iran.,Department of Oral Cell Biology and Functional Anatomy, Academic Center for Dentistry Amsterdam (ACTA), University of Amsterdam and VU University Amsterdam, Amsterdam, The Netherlands
| | - Hamid Mirzadeh
- Polymer Engineering and Color Technology Faculty, Amirkabir University of Technology (Tehran Polytechnic), Tehran, Iran
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22
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Han T, Gui C, Lam JWY, Jiang M, Xie N, Kwok RTK, Tang BZ. High-Contrast Visualization and Differentiation of Microphase Separation in Polymer Blends by Fluorescent AIE Probes. Macromolecules 2017. [DOI: 10.1021/acs.macromol.7b00973] [Citation(s) in RCA: 59] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Affiliation(s)
- Ting Han
- Guangdong
Provincial Key Laboratory of Brain Science, Disease and Drug Development, HKUST-Shenzhen Research Institute, No. 9 Yuexing first RD, South Area, Hi-tech Park, Nanshan, Shenzhen 518057, China
- Department of Chemistry, Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction, Institute for Advanced Study, Institute of Molecular Functional Materials, Division of Biomedical Engineering, Division of Life Science and State Key Laboratory of Molecular Neuroscience, The Hong Kong University of Science & Technology, Clear Water Bay, Kowloon, Hong Kong
| | - Chen Gui
- Guangdong
Provincial Key Laboratory of Brain Science, Disease and Drug Development, HKUST-Shenzhen Research Institute, No. 9 Yuexing first RD, South Area, Hi-tech Park, Nanshan, Shenzhen 518057, China
- Department of Chemistry, Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction, Institute for Advanced Study, Institute of Molecular Functional Materials, Division of Biomedical Engineering, Division of Life Science and State Key Laboratory of Molecular Neuroscience, The Hong Kong University of Science & Technology, Clear Water Bay, Kowloon, Hong Kong
| | - Jacky W. Y. Lam
- Guangdong
Provincial Key Laboratory of Brain Science, Disease and Drug Development, HKUST-Shenzhen Research Institute, No. 9 Yuexing first RD, South Area, Hi-tech Park, Nanshan, Shenzhen 518057, China
- Department of Chemistry, Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction, Institute for Advanced Study, Institute of Molecular Functional Materials, Division of Biomedical Engineering, Division of Life Science and State Key Laboratory of Molecular Neuroscience, The Hong Kong University of Science & Technology, Clear Water Bay, Kowloon, Hong Kong
| | - Meijuan Jiang
- Guangdong
Provincial Key Laboratory of Brain Science, Disease and Drug Development, HKUST-Shenzhen Research Institute, No. 9 Yuexing first RD, South Area, Hi-tech Park, Nanshan, Shenzhen 518057, China
- Department of Chemistry, Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction, Institute for Advanced Study, Institute of Molecular Functional Materials, Division of Biomedical Engineering, Division of Life Science and State Key Laboratory of Molecular Neuroscience, The Hong Kong University of Science & Technology, Clear Water Bay, Kowloon, Hong Kong
| | - Ni Xie
- Guangdong
Provincial Key Laboratory of Brain Science, Disease and Drug Development, HKUST-Shenzhen Research Institute, No. 9 Yuexing first RD, South Area, Hi-tech Park, Nanshan, Shenzhen 518057, China
- Department of Chemistry, Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction, Institute for Advanced Study, Institute of Molecular Functional Materials, Division of Biomedical Engineering, Division of Life Science and State Key Laboratory of Molecular Neuroscience, The Hong Kong University of Science & Technology, Clear Water Bay, Kowloon, Hong Kong
| | - Ryan T. K. Kwok
- Guangdong
Provincial Key Laboratory of Brain Science, Disease and Drug Development, HKUST-Shenzhen Research Institute, No. 9 Yuexing first RD, South Area, Hi-tech Park, Nanshan, Shenzhen 518057, China
- Department of Chemistry, Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction, Institute for Advanced Study, Institute of Molecular Functional Materials, Division of Biomedical Engineering, Division of Life Science and State Key Laboratory of Molecular Neuroscience, The Hong Kong University of Science & Technology, Clear Water Bay, Kowloon, Hong Kong
| | - Ben Zhong Tang
- Guangdong
Provincial Key Laboratory of Brain Science, Disease and Drug Development, HKUST-Shenzhen Research Institute, No. 9 Yuexing first RD, South Area, Hi-tech Park, Nanshan, Shenzhen 518057, China
- Department of Chemistry, Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction, Institute for Advanced Study, Institute of Molecular Functional Materials, Division of Biomedical Engineering, Division of Life Science and State Key Laboratory of Molecular Neuroscience, The Hong Kong University of Science & Technology, Clear Water Bay, Kowloon, Hong Kong
- Guangdong
Innovative Research Team, SCUT-HKUST Joint Research Laboratory, State
Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou 510640, China
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23
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Deng Y, Zhang M, Chen X, Pu X, Liao X, Huang Z, Yin G. A novel akermanite/poly (lactic-co-glycolic acid) porous composite scaffold fabricated via a solvent casting-particulate leaching method improved by solvent self-proliferating process. Regen Biomater 2017; 4:233-242. [PMID: 28798869 PMCID: PMC5544913 DOI: 10.1093/rb/rbx014] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2017] [Revised: 04/25/2017] [Accepted: 04/28/2017] [Indexed: 01/08/2023] Open
Abstract
Desirable scaffolds for tissue engineering should be biodegradable carriers to supply suitable microenvironments mimicked the extracellular matrices for desired cellular interactions and to provide supports for the formation of new tissues. In this work, a kind of slightly soluble bioactive ceramic akermanite (AKT) powders were aboratively selected and introduced in the PLGA matrix, a novel l-lactide modified AKT/poly (lactic-co-glycolic acid) (m-AKT/PLGA) composite scaffold was fabricated via a solvent casting-particulate leaching method improved by solvent self-proliferating process. The effects of m-AKT contents on properties of composite scaffolds and on MC3T3-E1 cellular behaviors in vitro have been primarily investigated. The fabricated scaffolds exhibited three-dimensional porous networks, in which homogenously distributed cavities in size of 300–400 μm were interconnected by some smaller holes in a size of 100–200 μm. Meanwhile, the mechanical structure of scaffolds was reinforced by the introduction of m-AKT. Moreover, alkaline ionic products released by m-AKT could neutralize the acidic degradation products of PLGA, and the apatite-mineralization ability of scaffolds could be largely improved. More valuably, significant promotions on adhesion, proliferation, and differentiation of MC3T3-E1 have been observed, which implied the calcium, magnesium and especially silidous ions released sustainably from composite scaffolds could regulate the behaviors of osteogenesis-related cells.
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Affiliation(s)
- Yao Deng
- College of Materials Science and Engineering, Sichuan University, Chengdu 610064, PR China
| | - Mengjiao Zhang
- College of Materials Science and Engineering, Sichuan University, Chengdu 610064, PR China
| | - Xianchun Chen
- College of Materials Science and Engineering, Sichuan University, Chengdu 610064, PR China
| | - Ximing Pu
- College of Materials Science and Engineering, Sichuan University, Chengdu 610064, PR China
| | - Xiaoming Liao
- College of Materials Science and Engineering, Sichuan University, Chengdu 610064, PR China
| | - Zhongbing Huang
- College of Materials Science and Engineering, Sichuan University, Chengdu 610064, PR China
| | - Guangfu Yin
- College of Materials Science and Engineering, Sichuan University, Chengdu 610064, PR China
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24
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Kang-Mieler JJ, Dosmar E, Liu W, Mieler WF. Extended ocular drug delivery systems for the anterior and posterior segments: biomaterial options and applications. Expert Opin Drug Deliv 2016; 14:611-620. [PMID: 27551742 DOI: 10.1080/17425247.2016.1227785] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
INTRODUCTION The development of new therapies for treating various eye conditions has led to a demand for extended release delivery systems, which would lessen the need for frequent application while still achieving therapeutic drug levels in the target tissues. Areas covered: Following an overview of the different ocular drug delivery modalities, this article surveys the biomaterials used to develop sustained release drug delivery systems. Microspheres, nanospheres, liposomes, hydrogels, and composite systems are discussed in terms of their primary materials. The advantages and disadvantages of each drug delivery system are discussed for various applications. Recommendations for modifications and strategies for improvements to these basic systems are also discussed. Expert opinion: An ideal sustained release drug delivery system should be able to encapsulate and deliver the necessary drug to the target tissues at a therapeutic level without any detriment to the drug. Drug encapsulation should be as high as possible to minimize loss and unless it is specifically desired, the initial burst of drug release should be kept to a minimum. By modifying various biomaterials, it is possible to achieve sustained drug delivery to both the anterior and posterior segments of the eye.
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Affiliation(s)
- Jennifer J Kang-Mieler
- a Department of Biomedical Engineering , Illinois Institute of Technology , Chicago , IL , USA
| | - Emily Dosmar
- a Department of Biomedical Engineering , Illinois Institute of Technology , Chicago , IL , USA
| | - Wenqiang Liu
- a Department of Biomedical Engineering , Illinois Institute of Technology , Chicago , IL , USA
| | - William F Mieler
- b Department of Ophthalmology and Visual Sciences , University of Illinois at Chicago , Chicago , IL , USA
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25
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Denkbas EB, Ottenbrite RM. Perspectives on: Chitosan Drug Delivery Systems Based on their Geometries. J BIOACT COMPAT POL 2016. [DOI: 10.1177/0883911506066930] [Citation(s) in RCA: 118] [Impact Index Per Article: 14.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Chitosan is a natural polymer that has many physicochemical (polycationic, reactive OH and NH2 groups) and biological (bioactive, biocompatible, biodegradable) properties. These unique properties make chitosan an excellent material for the development of new biomedical applications. One of the most well known biomedical chitosan applications is in drug delivery systems. Chitosans have been used in the design of many different types of drug carriers for various administration routes such as oral, bucal, nasal, transdermal, parenteral, vaginal, cervical, intrauterine and rectal. Chitosan can be engineered into different shapes and geometries such as nanoparticles, microspheres, membranes, sponges and rods. This paper is a perspective on the preparation of the chitosan drug delivery systems based on different structural geometries. In this respect, special preparation techniques are used to prepare chitosan drug carriers by altering such parameters as crosslinker concentration, chitosan molecular weight, drug/polymer ratio and processing conditions all of which affect the morphology of chitosan drug carriers and release rate of the loaded drug.
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Affiliation(s)
- Emir Baki Denkbas
- Hacettepe University, Chemistry Department, Biochemistry Division, 06800 Beytepe, Ankara, Turkey
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26
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Sajeesh S, Sharma CP. Poly Methacrylic Acid-Alginate Semi-IPN Microparticles for Oral Delivery of Insulin: A Preliminary Investigation. J Biomater Appl 2016; 19:35-45. [PMID: 15245642 DOI: 10.1177/0885328204042992] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Microparticles of Poly methacrylic acid (P1) and novel semi-interpenetrating network composed of Poly methacrylic acid-alginate (P2) were prepared and their application in oral insulin delivery was evaluated. The microparticles were characterized by scanning electron microscopy (SEM) for morphological studies. Insulin loading onto the microparticles was performed by the diffusion filling method and insulin encapsulated microparticles were subjected to in vitro release study in buffer solution of pH 1.2 and 7.4. The release kinetics at pH 7.4 exhibited sustained release of insulin for more than 5 h in case of PMAA microparticles whereas burst release of insulin (90% of total insulin loaded) within 1 h of study was observed in the case of PMAA-alginate microparticles. At pH 1.2, around 30% of insulin loaded was released from both microparticles within 2 h of study.
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Affiliation(s)
- S Sajeesh
- Division of Biosurface Technology, Bio Medical Technology Wing, Sree Chitra Tirunal Institute of Medical Science and Technology, Trivandrum-695 012, India
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27
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Effect of drying and loading methods on the release behavior of ciprofloxacin from starch nanoparticles. Int J Biol Macromol 2016; 87:55-61. [DOI: 10.1016/j.ijbiomac.2016.02.038] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2015] [Revised: 01/12/2016] [Accepted: 02/12/2016] [Indexed: 11/20/2022]
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28
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Zafar N, Agusti G, Fessi H, Elaissari A. Elaboration of sponge-like biodegradable cationic particles via double-emulsion solvent evaporation. J DISPER SCI TECHNOL 2016. [DOI: 10.1080/01932691.2016.1182923] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Affiliation(s)
- Nadiah Zafar
- University Lyon-1, UMR 5007, LAGEP-CPE, Villeurbanne, France
| | | | - Hatem Fessi
- University Lyon-1, UMR 5007, LAGEP-CPE, Villeurbanne, France
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29
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Tsai MJ, Lin MW, Huang YB, Kuo YM, Tsai YH. The Influence of Acute Hyperglycemia in an Animal Model of Lacunar Stroke That Is Induced by Artificial Particle Embolization. Int J Med Sci 2016; 13:347-56. [PMID: 27226775 PMCID: PMC4879767 DOI: 10.7150/ijms.14393] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/11/2015] [Accepted: 03/31/2016] [Indexed: 11/10/2022] Open
Abstract
Animal and clinical studies have revealed that hyperglycemia during ischemic stroke increases the stroke's severity and the infarct size in clinical and animal studies. However, no conclusive evidence demonstrates that acute hyperglycemia worsens post-stroke outcomes and increases infarct size in lacunar stroke. In this study, we developed a rat model of lacunar stroke that was induced via the injection of artificial embolic particles during full consciousness. We then used this model to compare the acute influence of hyperglycemia in lacunar stroke and diffuse infarction, by evaluating neurologic behavior and the rate, size, and location of the infarction. The time course of the neurologic deficits was clearly recorded from immediately after induction to 24 h post-stroke in both types of stroke. We found that acute hyperglycemia aggravated the neurologic deficit in diffuse infarction at 24 h after stroke, and also aggravated the cerebral infarct. Furthermore, the infarct volumes of the basal ganglion, thalamus, hippocampus, and cerebellum but not the cortex were positively correlated with serum glucose levels. In contrast, acute hyperglycemia reduced the infarct volume and neurologic symptoms in lacunar stroke within 4 min after stroke induction, and this effect persisted for up to 24 h post-stroke. In conclusion, acute hyperglycemia aggravated the neurologic outcomes in diffuse infarction, although it significantly reduced the size of the cerebral infarct and improved the neurologic deficits in lacunar stroke.
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Affiliation(s)
- Ming-Jun Tsai
- 1. Department of Neurology, China Medical University Hospital, Taichung 404, Taiwan; 2. School of Medicine, China Medical University, Taichung 404, Taiwan; 6. Department of Neurology, China Medical University, An-Nan Hospital, Tainan 709, Taiwan
| | - Ming-Wei Lin
- 3. Center for Stem Cell Research, Kaohsiung Medical University, Kaohsiung 807, Taiwan
| | - Yaw-Bin Huang
- 3. Center for Stem Cell Research, Kaohsiung Medical University, Kaohsiung 807, Taiwan; 4. School of Pharmacy, Kaohsiung Medical University, Kaohsiung 807, Taiwan
| | - Yu-Min Kuo
- 5. Department of Cell Biology and Anatomy, National Cheng Kung University, Tainan 701, Taiwan
| | - Yi-Hung Tsai
- 3. Center for Stem Cell Research, Kaohsiung Medical University, Kaohsiung 807, Taiwan
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30
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Recent developments and future prospects on bio-based polyesters derived from renewable resources: A review. Int J Biol Macromol 2016; 82:1028-40. [DOI: 10.1016/j.ijbiomac.2015.10.040] [Citation(s) in RCA: 152] [Impact Index Per Article: 19.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2015] [Revised: 10/07/2015] [Accepted: 10/13/2015] [Indexed: 02/08/2023]
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31
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Scislowska-Czarnecka A, Szmigiel D, Genet M, Dupont-Gillain C, Pamula E, Kolaczkowska E. Oxygen plasma surface modification augments poly(L-lactide-co-glycolide) cytocompatibility toward osteoblasts and minimizes immune activation of macrophages. J Biomed Mater Res A 2015; 103:3965-77. [DOI: 10.1002/jbm.a.35509] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2015] [Revised: 05/06/2015] [Accepted: 05/19/2015] [Indexed: 11/07/2022]
Affiliation(s)
| | - Dariusz Szmigiel
- Division of Silicon Microsystem and Nanostructure Technology; Institute of Electron Technology; Warsaw Poland
| | - Michel Genet
- Division of Bio & Soft Matter; Université Catholique De Louvain, Institute of Condensed Matter and Nanosciences; Louvain-la-Neuve 1348 Belgium
| | - Christine Dupont-Gillain
- Division of Bio & Soft Matter; Université Catholique De Louvain, Institute of Condensed Matter and Nanosciences; Louvain-la-Neuve 1348 Belgium
| | - Elzbieta Pamula
- Faculty of Materials Science and Ceramics, Department of Biomaterials; AGH University of Science and Technology; Krakow 30-059 Poland
| | - Elzbieta Kolaczkowska
- Department of Evolutionary Immunobiology; Jagiellonian University, Institute of Zoology; Krakow Poland
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32
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Zhai P, Chen XB, Schreyer DJ. PLGA/alginate composite microspheres for hydrophilic protein delivery. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2015; 56:251-9. [PMID: 26249587 DOI: 10.1016/j.msec.2015.06.015] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/16/2015] [Revised: 05/11/2015] [Accepted: 06/09/2015] [Indexed: 11/16/2022]
Abstract
Poly(lactic-co-glycolic acid) (PLGA) microspheres and PLGA/alginate composite microspheres were prepared by a novel double emulsion and solvent evaporation technique and loaded with bovine serum albumin (BSA) or rabbit anti-laminin antibody protein. The addition of alginate and the use of a surfactant during microsphere preparation increased the encapsulation efficiency and reduced the initial burst release of hydrophilic BSA. Confocal laser scanning microcopy (CLSM) of BSA-loaded PLGA/alginate composite microspheres showed that PLGA, alginate, and BSA were distributed throughout the depths of microspheres; no core/shell structure was observed. Scanning electron microscopy revealed that PLGA microspheres erode and degrade more quickly than PLGA/alginate composite microspheres. When loaded with anti-laminin antibody, the function of released antibody was well preserved in both PLGA and PLGA/alginate composite microspheres. The biocompatibility of PLGA and PLGA/alginate microspheres were examined using four types of cultured cell lines, representing different tissue types. Cell survival was variably affected by the inclusion of alginate in composite microspheres, possibly due to the sensitivity of different cell types to excess calcium that may be released from the calcium cross-linked alginate.
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Affiliation(s)
- Peng Zhai
- Department of Anatomy and Cell Biology, University of Saskatchewan, S7N5E5, Canada; Division of Biomedical Engineering, University of Saskatchewan, S7N5A9, Canada
| | - X B Chen
- Department of Mechanical Engineering, University of Saskatchewan, S7N5A9, Canada; Division of Biomedical Engineering, University of Saskatchewan, S7N5A9, Canada
| | - David J Schreyer
- Department of Anatomy and Cell Biology, University of Saskatchewan, S7N5E5, Canada; Division of Biomedical Engineering, University of Saskatchewan, S7N5A9, Canada.
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33
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Nelson N, Schwartz DK. Unbiased Clustering of Molecular Dynamics for Spatially Resolved Analysis of Chemically Heterogeneous Surfaces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:6099-6106. [PMID: 26001158 DOI: 10.1021/acs.langmuir.5b01251] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
A technique is described for resolving and interpreting molecular interactions with a chemically heterogeneous surface. Using total internal reflection fluorescence microscopy, dynamic single molecule trajectories were accumulated simultaneously for fluorescently labeled fatty acid (interacting primarily via hydrophobic interactions) and dextran (interacting via hydrogen-bonding interactions) probe molecules at the interface between an aqueous solvent and a photopatterned solid surface with distinct regions of amine-terminated and poly(ethylene glycol) self-assembled monolayers. Using dynamic properties of the probe molecules (adsorption rate, surface diffusion coefficient, residence time), an unsupervised Gaussian mixture model algorithm was used to identify areas of the surface that were chemically related to each other, and the dynamic behaviors of the probe molecules were studied statistically on these distinct regions. The dynamic data were compared to data from homogeneous surfaces of known chemistry to provide a chemical identification of each location on the surface. Spatial maps were also constructed, allowing for spatial visualization of surface chemistry on a hydrophilic substrate. This work enables the direct study of interactions between single-molecule probes and distinct surface chemistries, even in the presence of spatial heterogeneity, without human bias, assumptions about surface structure, or model-dependent analysis.
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Affiliation(s)
- Nathaniel Nelson
- Department of Chemical and Biological Engineering, University of Colorado Boulder, Boulder, Colorado 80309, United States
| | - Daniel K Schwartz
- Department of Chemical and Biological Engineering, University of Colorado Boulder, Boulder, Colorado 80309, United States
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34
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Younes I, Rinaudo M. Chitin and chitosan preparation from marine sources. Structure, properties and applications. Mar Drugs 2015; 13:1133-74. [PMID: 25738328 PMCID: PMC4377977 DOI: 10.3390/md13031133] [Citation(s) in RCA: 1054] [Impact Index Per Article: 117.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2014] [Accepted: 02/16/2015] [Indexed: 02/07/2023] Open
Abstract
This review describes the most common methods for recovery of chitin from marine organisms. In depth, both enzymatic and chemical treatments for the step of deproteinization are compared, as well as different conditions for demineralization. The conditions of chitosan preparation are also discussed, since they significantly impact the synthesis of chitosan with varying degree of acetylation (DA) and molecular weight (MW). In addition, the main characterization techniques applied for chitin and chitosan are recalled, pointing out the role of their solubility in relation with the chemical structure (mainly the acetyl group distribution along the backbone). Biological activities are also presented, such as: antibacterial, antifungal, antitumor and antioxidant. Interestingly, the relationship between chemical structure and biological activity is demonstrated for chitosan molecules with different DA and MW and homogeneous distribution of acetyl groups for the first time. In the end, several selected pharmaceutical and biomedical applications are presented, in which chitin and chitosan are recognized as new biomaterials taking advantage of their biocompatibility and biodegradability.
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Affiliation(s)
- Islem Younes
- Laboratory of Enzyme Engineering and Microbiology, University of Sfax, National School of Engineering, PO Box 1173-3038, Sfax, Tunisia.
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35
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Lin HK, Madihally SV, Palmer B, Frimberger D, Fung KM, Kropp BP. Biomatrices for bladder reconstruction. Adv Drug Deliv Rev 2015; 82-83:47-63. [PMID: 25477305 DOI: 10.1016/j.addr.2014.11.020] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2014] [Revised: 11/17/2014] [Accepted: 11/24/2014] [Indexed: 12/22/2022]
Abstract
There is a demand for tissue engineering of the bladder needed by patients who experience a neurogenic bladder or idiopathic detrusor overactivity. To avoid complications from augmentation cystoplasty, the field of tissue engineering seeks optimal scaffolds for bladder reconstruction. Naturally derived biomaterials as well as synthetic and natural polymers have been explored as bladder substitutes. To improve regenerative properties, these biomaterials have been conjugated with functional molecules, combined with nanotechology, or seeded with exogenous cells. Although most studies reported complete and functional bladder regeneration in small-animal models, results from large-animal models and human clinical trials varied. For functional bladder regeneration, procedures for biomaterial fabrication, incorporation of biologically active agents, introduction of nanotechnology, and application of stem-cell technology need to be standardized. Advanced molecular and medical technologies such as next generation sequencing and magnetic resonance imaging can be introduced for mechanistic understanding and non-invasive monitoring of regeneration processes, respectively.
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Affiliation(s)
- Hsueh-Kung Lin
- Department of Urology, The Children's Hospital of Oklahoma, University of Oklahoma Health Sciences Center, Oklahoma City, OK 73104, USA
| | - Sundar V Madihally
- Department of Chemical Engineering, 423 Engineering North, Oklahoma State University, Stillwater, OK 74078, USA
| | - Blake Palmer
- Department of Urology, The Children's Hospital of Oklahoma, University of Oklahoma Health Sciences Center, Oklahoma City, OK 73104, USA
| | - Dominic Frimberger
- Department of Urology, The Children's Hospital of Oklahoma, University of Oklahoma Health Sciences Center, Oklahoma City, OK 73104, USA
| | - Kar-Ming Fung
- Department of Urology, The Children's Hospital of Oklahoma, University of Oklahoma Health Sciences Center, Oklahoma City, OK 73104, USA; Department of Pathology, University of Oklahoma Health Sciences Center, Oklahoma City, OK 73104, USA
| | - Bradley P Kropp
- Department of Urology, The Children's Hospital of Oklahoma, University of Oklahoma Health Sciences Center, Oklahoma City, OK 73104, USA.
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36
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Prajapati VD, Jani GK, Kapadia JR. Current knowledge on biodegradable microspheres in drug delivery. Expert Opin Drug Deliv 2015; 12:1283-99. [DOI: 10.1517/17425247.2015.1015985] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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37
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Dias DJS, Joanitti GA, Azevedo RB, Silva LP, Lunardi CN, Gomes AJ. Chlorambucil Encapsulation into PLGA Nanoparticles and Cytotoxic Effects in Breast Cancer Cell. ACTA ACUST UNITED AC 2015. [DOI: 10.4236/jbpc.2015.61001] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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38
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Liu J, Liu XL, Xi TF, Chu CC. A novel pseudo-protein-based biodegradable coating for magnesium substrates: in vitro corrosion phenomena and cytocompatibility. J Mater Chem B 2015; 3:878-893. [DOI: 10.1039/c4tb01527d] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
The goal of this study is to examine whether a member of the newly developed biodegradable pseudo-protein biomaterial family could provide a far better protection and performance than the popular hydrolytically degradable poly(glycolide-co-lactide) (PLGA) biomaterial on an experimental magnesium substrate as a model.
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Affiliation(s)
- J. Liu
- Center for Biomedical Materials and Tissue Engineering
- Academy for Advanced Interdisciplinary Studies
- Peking University
- Beijing 100871
- China
| | - X. L. Liu
- School of Materials Science and Engineering
- University of Science and Technology Beijing
- Beijing 100083
- China
| | - T. F. Xi
- Center for Biomedical Materials and Tissue Engineering
- Academy for Advanced Interdisciplinary Studies
- Peking University
- Beijing 100871
- China
| | - C. C. Chu
- Biomedical Engineering Program
- Cornell University
- Ithaca
- USA
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39
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Pacheco DP, Amaral MH, Reis RL, Marques AP, Correlo VM. Development of an injectable PHBV microparticles-GG hydrogel hybrid system for regenerative medicine. Int J Pharm 2014; 478:398-408. [PMID: 25448558 DOI: 10.1016/j.ijpharm.2014.11.036] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2014] [Revised: 11/13/2014] [Accepted: 11/14/2014] [Indexed: 10/24/2022]
Abstract
Uncontrollable displacements that greatly affect the concentration of active agents at the target tissues are among a major limitation of the use of microparticulate drug delivery systems (DDS). Under this context a biphasic injectable DDS combining poly(hydroxybutyrate-co-hydroxyvalerate) (PHBV) microparticles (MPs) and a gellan gum (GG) injectable hydrogel is herein proposed for the localized delivery and long-term retention of MPs carrying hydrophilic and hydrophobic model active agents. A double emulsion-solvent evaporation method was adopted to develop the PHBV MPs, carrying bovine serum albumin (BSA) or dexamethasone (Dex) as hydrophilic and hydrophobic active agents' models, respectively. Moreover, this method was modified, together with the properties of the hydrogel to tailor the delivery profile of the active agents. Variations of the composition of the organic phase during the process allowed tuning surface topography, particle size distribution and core porosity of the PHBV MPs and, thus, the in vitro release profile of Dex but not of BSA. Besides, after embedding hydrogels of higher GG concentration led to a slower and more sustained release of both active agents, independently of the processing conditions of the microparticulate system.
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Affiliation(s)
- Daniela P Pacheco
- 3B's Research Group - Biomaterials, Biodegradables and Biomimetics, University of Minho, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, AvePark, 4806-909 Taipas, Guimarães, Portugal; ICVS/3B's - PT Government Associate Laboratory, Braga/Guimarães, Portugal; Laboratory of Pharmaceutical Technology/Centre of Research in Pharmaceutical Sciences, Faculty of Pharmacy, University of Porto, 4050-313 Porto, Portugal
| | - Maria H Amaral
- Laboratory of Pharmaceutical Technology/Centre of Research in Pharmaceutical Sciences, Faculty of Pharmacy, University of Porto, 4050-313 Porto, Portugal
| | - Rui L Reis
- 3B's Research Group - Biomaterials, Biodegradables and Biomimetics, University of Minho, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, AvePark, 4806-909 Taipas, Guimarães, Portugal; ICVS/3B's - PT Government Associate Laboratory, Braga/Guimarães, Portugal
| | - Alexandra P Marques
- 3B's Research Group - Biomaterials, Biodegradables and Biomimetics, University of Minho, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, AvePark, 4806-909 Taipas, Guimarães, Portugal; ICVS/3B's - PT Government Associate Laboratory, Braga/Guimarães, Portugal
| | - Vítor M Correlo
- 3B's Research Group - Biomaterials, Biodegradables and Biomimetics, University of Minho, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, AvePark, 4806-909 Taipas, Guimarães, Portugal; ICVS/3B's - PT Government Associate Laboratory, Braga/Guimarães, Portugal.
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40
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Narayanan D, Jayakumar R, Chennazhi KP. Versatile carboxymethyl chitin and chitosan nanomaterials: a review. WILEY INTERDISCIPLINARY REVIEWS-NANOMEDICINE AND NANOBIOTECHNOLOGY 2014; 6:574-98. [DOI: 10.1002/wnan.1301] [Citation(s) in RCA: 55] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/10/2014] [Revised: 07/25/2014] [Accepted: 08/19/2014] [Indexed: 12/29/2022]
Affiliation(s)
- Deepa Narayanan
- Amrita Centre for Nanosciences and Molecular Medicine, Amrita Institute of Medical Sciences and Research Centre; Amrita Vishwa Vidyapeetham University; Kochi India
| | - R. Jayakumar
- Amrita Centre for Nanosciences and Molecular Medicine, Amrita Institute of Medical Sciences and Research Centre; Amrita Vishwa Vidyapeetham University; Kochi India
| | - K. P. Chennazhi
- Amrita Centre for Nanosciences and Molecular Medicine, Amrita Institute of Medical Sciences and Research Centre; Amrita Vishwa Vidyapeetham University; Kochi India
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41
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Shang Y, Ding F, Xiao L, Deng H, Du Y, Shi X. Chitin-based fast responsive pH sensitive microspheres for controlled drug release. Carbohydr Polym 2014; 102:413-8. [DOI: 10.1016/j.carbpol.2013.11.039] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2013] [Revised: 11/12/2013] [Accepted: 11/26/2013] [Indexed: 12/13/2022]
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42
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Fabrication of microfibrous and nano-/microfibrous scaffolds: melt and hybrid electrospinning and surface modification of poly(L-lactic acid) with plasticizer. BIOMED RESEARCH INTERNATIONAL 2013; 2013:309048. [PMID: 24381937 PMCID: PMC3870109 DOI: 10.1155/2013/309048] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/09/2013] [Accepted: 11/02/2013] [Indexed: 11/18/2022]
Abstract
Biodegradable poly(L-lactic acid) (PLA) fibrous scaffolds were prepared by electrospinning from a PLA melt containing poly(ethylene glycol) (PEG) as a plasticizer to obtain thinner fibers. The effects of PEG on the melt electrospinning of PLA were examined in terms of the melt viscosity and fiber diameter. Among the parameters, the content of PEG had a more significant effect on the average fiber diameter and its distribution than those of the spinning temperature. Furthermore, nano-/microfibrous silk fibroin (SF)/PLA and PLA/PLA composite scaffolds were fabricated by hybrid electrospinning, which involved a combination of solution electrospinning and melt electrospinning. The SF/PLA (20/80) scaffolds consisted of a randomly oriented structure of PLA microfibers (average fiber diameter = 8.9 µm) and SF nanofibers (average fiber diameter = 820 nm). The PLA nano-/microfiber (20/80) scaffolds were found to have similar pore parameters to the PLA microfiber scaffolds. The PLA scaffolds were treated with plasma in the presence of either oxygen or ammonia gas to modify the surface of the fibers. This approach of controlling the surface properties and diameter of fibers could be useful in the design and tailoring of novel scaffolds for tissue engineering.
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43
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Jang JE, Kim HY, Song JE, Lee D, Kwon SY, Chung JW, Khang G. Regeneration of Intervertebral Disc Using Poly(lactic-co-glycolic acid) Scaffolds Included Demineralized Bone Particle In Vivo. POLYMER-KOREA 2013. [DOI: 10.7317/pk.2013.37.6.669] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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44
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Tseng YY, Kao YC, Liao JY, Chen WA, Liu SJ. Biodegradable drug-eluting poly[lactic-co-glycol acid] nanofibers for the sustainable delivery of vancomycin to brain tissue: in vitro and in vivo studies. ACS Chem Neurosci 2013; 4:1314-21. [PMID: 23815098 DOI: 10.1021/cn400108q] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
Abstract
Successful treatment of a brain infection requires aspiration of the pus or excision of the abscess, followed by long-term (usually 4-8 weeks) parenteral antibiotic treatment. Local antibiotic delivery using biodegradable drug-impregnated carriers is effective in treating postoperative infections, thereby reducing the toxicity associated with parenteral antibiotic treatment and the expense involved with long-term hospitalization. We have developed vancomycin-loaded, biodegradable poly[lactic-co-glycol acid] nanofibrous membranes for the sustainable delivery of vancomycin to the brain tissue of rats by using the electrospinning technique. A high-performance liquid chromatography assay was employed to characterize the in vitro and in vivo release behaviors of pharmaceuticals from the membranes. The experimental results suggested that the biodegradable nanofibers can release high concentrations of vancomycin for more than 8 weeks in the cerebral cavity of rats. Furthermore, the membranes can cover the wall of the cavity after the removal of abscess more completely and achieve better drug delivery without inducing adverse mass effects in the brain. Histological examination also showed no inflammation reaction of the brain tissues. By adopting the biodegradable, nanofibrous drug-eluting membranes, we will be able to achieve long-term deliveries of various antibiotics in the cerebral cavity to enhance the therapeutic efficacy of cerebral infections.
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Affiliation(s)
- Yuan-Yun Tseng
- Department of Neurosurgery, Shuang Ho Hospital, Taipei Medical University, Taipei, Taiwan
- Department of Neurosurgery, Wan Fang
Hospital, Taipei Medical University, Taipei,
Taiwan
- Department of Mechanical
Engineering, Chang Gung University, Tao-Yuan,
Taiwan
| | - Yu-Chun Kao
- Department of Mechanical
Engineering, Chang Gung University, Tao-Yuan,
Taiwan
| | - Jun-Yi Liao
- Graduate Institute
of Medical Mechatronics, Chang Gung University, Tao-Yuan, Taiwan
| | - Wei-An Chen
- Department of Mechanical
Engineering, Chang Gung University, Tao-Yuan,
Taiwan
| | - Shih-Jung Liu
- Department of Mechanical
Engineering, Chang Gung University, Tao-Yuan,
Taiwan
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Iwanaga S, Saito N, Sanae H, Nakamura M. Facile fabrication of uniform size-controlled microparticles and potentiality for tandem drug delivery system of micro/nanoparticles. Colloids Surf B Biointerfaces 2013; 109:301-6. [DOI: 10.1016/j.colsurfb.2013.04.007] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2013] [Revised: 03/15/2013] [Accepted: 04/15/2013] [Indexed: 10/26/2022]
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Active films from water-soluble chitosan/cellulose composites incorporating releasable caffeic acid for inhibition of lipid oxidation in fish oil emulsions. Food Hydrocoll 2013. [DOI: 10.1016/j.foodhyd.2012.11.036] [Citation(s) in RCA: 80] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Tseng YY, Liao JY, Chen WA, Kao YC, Liu SJ. Biodegradable poly([D,L]-lactide-co-glycolide) nanofibers for the sustainable delivery of lidocaine into the epidural space after laminectomy. Nanomedicine (Lond) 2013; 9:77-87. [PMID: 23799985 DOI: 10.2217/nnm.13.42] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
AIM We developed biodegradable, lidocaine-embedded poly([D,L]-lactide-co-glycolide) nanofibers for epidural analgesia to reduce the severe pain in rats after laminectomies. MATERIALS & METHODS Nanofibers were prepared by an electrospinning process and were introduced into the epidural space of rats after laminectomy. The lidocaine concentration, postoperative bodyweight change and amount of food/water intake were monitored to evaluate the analgesic effectiveness of the drug-eluting nanofibers. RESULTS It was demonstrated that the nanofibers provided a sustained release of lidocaine for more than 2 weeks, and the local pharmaceutical concentration was much higher than the concentration in plasma. Rats that received laminectomies without nanofibers exhibited the greatest bodyweight reduction. The food/water intake and activity performance were significantly higher in rats receiving laminectomies with nanofibers than in rats without nanofibers. CONCLUSION The results of this study suggest that the lidocaine-loaded nanofibers can provide an easy, practical and safe means of achieving effective postlaminectomy analgesia.
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Affiliation(s)
- Yuan-Yun Tseng
- Department of Neurosurgery, Shuang Ho Hospital, Taipei Medical University, Taipei, Taiwan
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Dai L, Li D, He J. Degradation of graft polymer and blend based on cellulose and poly(L-lactide). J Appl Polym Sci 2013. [DOI: 10.1002/app.39451] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Lin Dai
- Institute of Materials Science and Technology; Beijing Forestry University; 10083; Beijing; China
| | - Dan Li
- Institute of Materials Science and Technology; Beijing Forestry University; 10083; Beijing; China
| | - Jing He
- Institute of Materials Science and Technology; Beijing Forestry University; 10083; Beijing; China
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Tseng YY, Liao JY, Chen WA, Kao YC, Liu SJ. Sustainable release of carmustine from biodegradable poly[((D,L))-lactide-co-glycolide] nanofibrous membranes in the cerebral cavity: in vitro and in vivo studies. Expert Opin Drug Deliv 2013; 10:879-88. [PMID: 23289446 DOI: 10.1517/17425247.2013.758102] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
OBJECTIVE Glioblastoma multiforme (GBM) is the most common and most aggressive malignant primary brain tumor in humans. The only interstitial chemotherapy pharmaceutical approved to date for GBM treatment is the Gliadel® wafer. Despite the safety and efficacy of this approach that have been demonstrated in patients undergoing resection of both newly diagnosed and recurrent malignant gliomas, the wafer provides an effective release of the anticancer 1,3-bis(2-chloroethyl)-1-nitrosourea (BCNU) for only 5 days. METHODS In this study, the authors developed biodegradable poly[(d,l)-lactide-co-glycolide] nanofibrous membranes via electrospinning that provided a sustained release of BCNU. An elution method and a HPLC assay were employed to characterize the in vitro and in vivo release behaviors of pharmaceuticals from the electrospun membranes. RESULTS The experimental results show that the biodegradable, nanofibrous membranes released high concentrations of BCNU for more than 6 weeks in the cerebral cavity of rats. Furthermore, the membranes can better conform to the geometry of the brain tissue and can cover more completely the tissue after the removal of tumors, achieving better drug transport without interfering with the normal function of the brain. Histological examination showed no obvious inflammation reactions of the brain tissues. CONCLUSION Adopting the electrospinning technique will help in manufacturing biodegradable, nanofibrous membranes for the long-term deliveries of various anticancer drugs in the cerebral cavity, which will further enhance the therapeutic efficacy of GBM treatment.
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Affiliation(s)
- Yuan-Yun Tseng
- Taipei Medical University, Shuang Ho Hospital, Department of Neurosurgery, Taipei, Taiwan
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