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Choi Y, Kang M, Choi MS, Kim Song J, Lih E, Lee D, Jung HH. Biomechanical Properties and Biocompatibility of a Non-Absorbable Elastic Thread. J Funct Biomater 2019; 10:E51. [PMID: 31744160 PMCID: PMC6963933 DOI: 10.3390/jfb10040051] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2019] [Revised: 11/05/2019] [Accepted: 11/09/2019] [Indexed: 12/11/2022] Open
Abstract
To date, extensive studies have been conducted to assess diverse types of sutures. But there is a paucity of data regarding biomechanical properties of commonly used suture materials. In the current experiment, we compared biomechanical properties and biocompatibility, such as tensile strength and elongation, the degree of bovine serum albumin (BSA) release, in vitro cytotoxicity and ex vivo frictional properties, between a non-absorbable elastic thread (NAT; HansBiomed Co. Ltd., Seoul, Korea) (NAT-R: NAT with a rough surface, NAT-S: NAT with a smooth surface) and the Elasticum® (Korpo SRL, Genova, Italy). The degree of tensile strength and elongation of Si threads was significantly higher in both the NAT-R and -S as compared with the Elasticum® (p < 0.05). Moreover, the degree of tensile strength and elongation of PET threads was significantly lower in both NAT-R and -S as compared with the Elasticum® (p < 0.05). Furthermore, the degree of tensile strength and elongation of braided Si/PET threads was significantly lower in NAT-S as compared with NAT-R and Elasticum® (p < 0.05). The degree of BSA release was significantly higher in the NAT-R as compared with Elasticum® and NAT-S throughout a 2-h period in the descending order (p < 0.05). The degree of cell viability was significantly higher in both NAT-R and -S as compared with Elasticum® (p < 0.05). The degree of coefficient of friction as well as the frictional force and strength was significantly higher in NAT-R as compared with NAT-S and Elasticum® (p < 0.05). NAT had a higher degree of biomechanical properties and biocompatibility as compared with Elasticum®. But further experimental and clinical studies are warranted to compare the efficacy, safety, and potential role as a carrier for drug delivery between NAT and Elasticum®.
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Affiliation(s)
- Yeji Choi
- Advanced Medical Device R&D Center, HansBiomed Co. Ltd., 7, Jeongui-ro 8-gil, Songpa-gu, Seoul 05836, Korea; (Y.C.); (E.L.); (D.L.)
| | | | | | | | - Eugene Lih
- Advanced Medical Device R&D Center, HansBiomed Co. Ltd., 7, Jeongui-ro 8-gil, Songpa-gu, Seoul 05836, Korea; (Y.C.); (E.L.); (D.L.)
| | - Deahyung Lee
- Advanced Medical Device R&D Center, HansBiomed Co. Ltd., 7, Jeongui-ro 8-gil, Songpa-gu, Seoul 05836, Korea; (Y.C.); (E.L.); (D.L.)
| | - Hong-Hee Jung
- Advanced Medical Device R&D Center, HansBiomed Co. Ltd., 7, Jeongui-ro 8-gil, Songpa-gu, Seoul 05836, Korea; (Y.C.); (E.L.); (D.L.)
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Bao Y, Wang S, Li H, Wang Y, Chen H, Yuan M. Characterization, Stability and Biological Activity In Vitro of Cathelicidin-BF-30 Loaded 4-Arm Star-Shaped PEG-PLGA Microspheres. Molecules 2018; 23:molecules23020497. [PMID: 29473887 PMCID: PMC6017235 DOI: 10.3390/molecules23020497] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2018] [Revised: 02/18/2018] [Accepted: 02/18/2018] [Indexed: 11/16/2022] Open
Abstract
BF-30 is a single chain polypeptide of an N-segment with an α-helix from cathelicidin gene encoding, and it contains 30 amino acid residues, with a relative molecular mass and isoelectric point of 3637.54 and 11.79, respectively. Cathelicidin-BF-30 was entrapped in four-arm star-shaped poly(ethylene glycol-b-dl-lactic acid-co-glycolic acid) block copolymers (4-arm-PEG-PLGA) by a double-emulsion solvent-evaporation method. Three release phases of cathelicidin-BF-30loaded 4-arm-PEG-PLGA microspheres were observed, including an initial burst-release phase, followed by a lag phase with minimal drug release and finally a secondary zero-order release phase. The delivery system released BF-30 over more than 15 days in vitro. Furthermore, the material for preparing the microspheres has good biocompatibility and biodegradability. Additionally, based on the drug resistance of food pathogenic bacteria, the antibacterial effects of BF-30 on Shigella dysenteriae CMCC 51105 (Sh. dysenteriae CMCC 51105), Salmonella typhi (S. typhi) and Staphylococcus aureus (S. aureus) as well as the stability of the in vitro release of the BF-30-loded microspheres were studied. The α-helix secondary structure and antibacterial activity of released BF-30 were retained and compared with native peptide. These BF-30 loaded microspheres presented <10% hemolysis and no toxicity for HEK293T cells even at the highest tested concentration (150 μg/mL), indicating that they are hemocompatible and a promising delivery and protection system for BF-30 peptide.
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Affiliation(s)
- Yueli Bao
- Engineering Research Center of Biopolymer Functional Materials of Yunnan, Yunnan Minzu University, Kunming 650500, China.
| | - Shanrong Wang
- Yunnan Rural Leader College, Yunnan Agricultural University, Heilongtan, Kunming 650201, China.
| | - Hongli Li
- Engineering Research Center of Biopolymer Functional Materials of Yunnan, Yunnan Minzu University, Kunming 650500, China.
| | - Yunjiao Wang
- Engineering Research Center of Biopolymer Functional Materials of Yunnan, Yunnan Minzu University, Kunming 650500, China.
| | - Haiyun Chen
- Engineering Research Center of Biopolymer Functional Materials of Yunnan, Yunnan Minzu University, Kunming 650500, China.
| | - Minglong Yuan
- Engineering Research Center of Biopolymer Functional Materials of Yunnan, Yunnan Minzu University, Kunming 650500, China.
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Preparation and Evaluation of Dexamethasone-Loaded Electrospun Nanofiber Sheets as a Sustained Drug Delivery System. MATERIALS 2016; 9:ma9030175. [PMID: 28773300 PMCID: PMC5456713 DOI: 10.3390/ma9030175] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/29/2015] [Revised: 01/31/2016] [Accepted: 03/01/2016] [Indexed: 12/27/2022]
Abstract
Recently, electrospinning technology has been widely used as a processing method to make nanofiber sheets (NS) for biomedical applications because of its unique features, such as ease of fabrication and high surface area. To develop a sustained dexamethasone (Dex) delivery system, in this work, poly(ε-caprolactone-co-l-lactide) (PCLA) copolymer with controllable biodegradability was synthesized and further utilized to prepare electrospun Dex-loaded NS using water-insoluble Dex (Dex(b)) or water-soluble Dex (Dex(s)). The Dex-NS obtained by electrospinning exhibited randomly oriented and interconnected fibrillar structures. The in vitro and in vivo degradation of Dex-NS was confirmed over a period of a few weeks by gel permeation chromatography (GPC) and nuclear magnetic resonance (NMR). The evaluation of in vitro and in vivo Dex(b) and Dex(s) release from Dex-NS showed an initial burst of Dex(b) at day 1 and, thereafter, almost the same amount of release as Dex(b) for up to 28 days. In contrast, Dex(s)-NS exhibited a small initial burst of Dex(s) and a first-order releasing profile from Dex-NS. In conclusion, Dex-NS exhibited sustained in vitro and in vivo Dex(s) release for a prolonged period, as well as controlled biodegradation of the NS over a defined treatment period.
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Cai Y, Guo L, Shen H, An X, Jiang H, Ji F, Niu Y. Degradability, bioactivity, and osteogenesis of biocomposite scaffolds of lithium-containing mesoporous bioglass and mPEG-PLGA-b-PLL copolymer. Int J Nanomedicine 2015; 10:4125-36. [PMID: 26150718 PMCID: PMC4484672 DOI: 10.2147/ijn.s82945] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
Biocomposite scaffolds of lithium (Li)-containing mesoporous bioglass and monomethoxy poly(ethylene glycol)-poly(D,L-lactide-co-glycolide)-poly(L-lysine) (mPEG-PLGA-b-PLL) copolymer were fabricated in this study. The results showed that the water absorption and degradability of Li-containing mesoporous bioglass/mPEG-PLGA-b-PLL composite (l-MBPC) scaffolds were obviously higher than Li-containing bioglass/mPEG-PLGA-b-PLL composite (l-BPC) scaffolds. Moreover, the apatite-formation ability of l-MBPC scaffolds was markedly enhanced as compared with l-BPC scaffolds, indicating that l-MBPC scaffolds containing mesoporous bioglass exhibited good bioactivity. The cell experimental results showed that cell attachment, proliferation, and alkaline phosphatase activity of MC3T3-E1 cells on l-MBPC scaffolds were remarkably improved as compared to l-BPC scaffolds. In animal experiments, the histological elevation results revealed that l-MBPC scaffolds significantly promoted new bone formation, indicating good osteogenesis. l-MBPC scaffolds with improved properties would be an excellent candidate for bone tissue repair.
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Affiliation(s)
- Yanrong Cai
- The College of Basic Science of Medicine, Hunan University of Traditional Chinese Medicine, Changsha, People's Republic of China
| | - Lieping Guo
- Department of Orthopaedics, Changhai Hospital, Second Military Medical University, Shanghai, People's Republic of China
| | - Hongxing Shen
- Department of Orthopaedics, Changhai Hospital, Second Military Medical University, Shanghai, People's Republic of China
| | - Xiaofei An
- Department of Orthopaedics, Changhai Hospital, Second Military Medical University, Shanghai, People's Republic of China
| | - Hong Jiang
- School of Materials Science and Engineering, University of Shanghai for Science and Technology, Shanghai, People's Republic of China
| | - Fang Ji
- Department of Orthopaedics, Changhai Hospital, Second Military Medical University, Shanghai, People's Republic of China
| | - Yunfei Niu
- Department of Orthopaedics, Changhai Hospital, Second Military Medical University, Shanghai, People's Republic of China
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Kim DY, Kwon DY, Kwon JS, Kim JH, Min BH, Kim MS. Stimuli-Responsive InjectableIn situ-Forming Hydrogels for Regenerative Medicines. POLYM REV 2015. [DOI: 10.1080/15583724.2014.983244] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Adeleke OA, Choonara YE, du Toit LC, Kumar P, Pillay V. In vitro, ex vivo and in silico mechanistic elucidation of the performance of an optimized porosity-controlled multi-elemental transbuccal system. Pharm Res 2015; 32:2384-409. [PMID: 25630817 DOI: 10.1007/s11095-015-1631-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2014] [Accepted: 01/16/2015] [Indexed: 10/24/2022]
Abstract
PURPOSE To elucidate the mechanisms of construction and performance of a porosity controlled, multi-elemental transbuccal system employing experimental and computational approaches. METHODS The production of the formulation was guided through a Box-Benkhen design employing homogenization coupled with lyophilization. The physicochemical and physicomechanical properties of the experimental design formulations were quantified with relevant analytical techniques. The influence of changes in porosity measures on the magnitude of these physical properties were explored mathematically. Furthermore, experimental outputs from the Box-Behnken design formulations were fitted into set limits and optimized using the response surface method. The optimized porosity-controlled formulation was subjected to mechanistic experimental and computational elucidations. RESULTS In general, the changes in magnitudes of studied porosity quantities had significant impact on formulation physicochemical and physicomechanical properties. The generation of an optimized formulation validated the stability and accuracy of the Box-Behnken experimental design. Experimental investigations revealed that the construction of this formulation is as a result of non-destructive physical interactions amongst its make-up compounds while its mechanism of performance is anchored mainly upon a gradual collapse of its ordered porous structure. Furthermore, the molecule mechanics simulations quantitatively predicted the molecular interactions inherent to multicomponent matrix formation and the mucoadhesion mechanism. CONCLUSIONS The fabrication and performance mechanisms of the porosity-controlled transbuccal system was successfully explored.
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Affiliation(s)
- Oluwatoyin A Adeleke
- Wits Advanced Drug Delivery Platform Research Unit, Department of Pharmacy and Pharmacology, School of Therapeutics, Faculty of Health Sciences, University of the Witwatersrand, 7 York Road, Parktown, 2193, Johannesburg, South Africa
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Liu P, Yu H, Sun Y, Zhu M, Duan Y. A mPEG-PLGA-b-PLL copolymer carrier for adriamycin and siRNA delivery. Biomaterials 2012; 33:4403-12. [DOI: 10.1016/j.biomaterials.2012.02.041] [Citation(s) in RCA: 101] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2011] [Accepted: 02/23/2012] [Indexed: 10/28/2022]
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Zhang Z, Tan S, Feng SS. Vitamin E TPGS as a molecular biomaterial for drug delivery. Biomaterials 2012; 33:4889-906. [DOI: 10.1016/j.biomaterials.2012.03.046] [Citation(s) in RCA: 437] [Impact Index Per Article: 36.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2012] [Accepted: 03/13/2012] [Indexed: 11/16/2022]
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9
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Lyu SR, Kuo YC, Lin MH, Hsieh WH, Chuang CW. Application of albumin-grafted scaffolds to promote neocartilage formation. Colloids Surf B Biointerfaces 2012; 91:296-301. [DOI: 10.1016/j.colsurfb.2011.11.019] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2011] [Revised: 11/09/2011] [Accepted: 11/11/2011] [Indexed: 11/16/2022]
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Ren X, Zheng N, Gao Y, Chen T, Lu W. Biodegradable three-dimension micro-device delivering 5-fluorouracil in tumor bearing mice. Drug Deliv 2012; 19:36-44. [DOI: 10.3109/10717544.2011.635720] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Fabrication of highly porous poly (ɛ-caprolactone) fibers for novel tissue scaffold via water-bath electrospinning. Colloids Surf B Biointerfaces 2011; 88:587-92. [PMID: 21856134 DOI: 10.1016/j.colsurfb.2011.07.045] [Citation(s) in RCA: 80] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2011] [Revised: 07/16/2011] [Accepted: 07/19/2011] [Indexed: 11/20/2022]
Abstract
Highly porous fibers were prepared by water-bath electrospinning from pure poly(ɛ-caprolactone) (PCL), and its blends with methoxy poly(ethylene glycol) (MPEG). These fibers were further analyzed by scanning electron microscopy (SEM), differential scanning calorimetry (DSC), X-ray diffraction (XRD), and gravimetric as well as contact angle measurement. SEM images showed that the fibers diameters as well as pores diameter on the fibers were affected by the weight ratio of MPEG/PCL. DSC and XRD not only revealed suppression of crystallinity of PCL but also indicated the presence of trace amount of MPEG in PCL water-bath collected fibers. The potential use of these hydrophilic porous electrospun fibrous mats as scaffolding materials was evaluated in vitro using mouse osteoblasts (MC3T3-E1) as reference cell lines. Cytotoxicity assessment of the fiber mats indicated that the porous electrospun mat containing trace amount of MPEG was nontoxic to the cell. Cell culture results showed that porous fibrous mats were good in promoting the cell attachment and proliferation. This novel electrospun matrix could be used as potential tissue scaffold material.
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13
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Construction and in vitro characterization of an optimized porosity-enabled amalgamated matrix for sustained transbuccal drug delivery. Int J Pharm 2010; 391:79-89. [DOI: 10.1016/j.ijpharm.2010.02.023] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2009] [Revised: 02/10/2010] [Accepted: 02/11/2010] [Indexed: 11/23/2022]
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14
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Ng SM, Choi JY, Han HS, Huh JS, Lim JO. Novel microencapsulation of potential drugs with low molecular weight and high hydrophilicity: Hydrogen peroxide as a candidate compound. Int J Pharm 2010; 384:120-7. [DOI: 10.1016/j.ijpharm.2009.10.005] [Citation(s) in RCA: 65] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2009] [Revised: 09/25/2009] [Accepted: 10/02/2009] [Indexed: 11/27/2022]
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15
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Park JK, Yeom J, Oh EJ, Reddy M, Kim JY, Cho DW, Lim HP, Kim NS, Park SW, Shin HI, Yang DJ, Park KB, Hahn SK. Guided bone regeneration by poly(lactic-co-glycolic acid) grafted hyaluronic acid bi-layer films for periodontal barrier applications. Acta Biomater 2009; 5:3394-403. [PMID: 19477304 DOI: 10.1016/j.actbio.2009.05.019] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2009] [Revised: 05/07/2009] [Accepted: 05/14/2009] [Indexed: 11/29/2022]
Abstract
A novel protocol for the synthesis of biocompatible and degradation controlled poly(lactic-co-glycolic acid) grafted hyaluronic acid (HA-PLGA) was successfully developed for periodontal barrier applications. HA was chemically modified with adipic acid dihydrazide (ADH) in the mixed solvent of water and ethanol, which resulted in a high degree of HA modification up to 85 mol.%. The stability of HA-ADH to enzymatic degradation by hyaluronidase increased with ADH content in HA-ADH. When the ADH content in HA-ADH was higher than 80 mol.%, HA-ADH became soluble in dimethyl sulfoxide and could be grafted to the activated PLGA with N,N'-dicyclohexyl carbodiimide and N-hydroxysuccinimide. The resulting HA-PLGA was used for the preparation of biphasic periodontal barrier membranes in chloroform. According to in vitro hydrolytic degradation tests in phosphate buffered saline, HA-PLGA/PLGA blend film with a weight ratio of 1/2 degraded relatively slowly compared to PLGA film and HA coated PLGA film. Four different samples of a control, OSSIX(TM) membrane, PLGA film, and HA-PLGA/PLGA film were assessed as periodontal barrier membranes for the calvarial critical size bone defects in SD rats. Histological and histomorphometric analyses revealed that HA-PLGA/PLGA film resulted in the most effective bone regeneration compared to other samples with a regenerated bone area of 63.1% covering the bone defect area.
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Affiliation(s)
- Jung Kyu Park
- Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), San 31, Hyoja-dong, Nam-gu, Pohang, Kyungbuk 790-784, Republic of Korea
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Chang YC, Chu IM. Methoxy poly(ethylene glycol)-b-poly(valerolactone) diblock polymeric micelles for enhanced encapsulation and protection of camptothecin. Eur Polym J 2008. [DOI: 10.1016/j.eurpolymj.2008.09.021] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Chung AJ, Kim D, Erickson D. Electrokinetic microfluidic devices for rapid, low power drug delivery in autonomous microsystems. LAB ON A CHIP 2008; 8:330-8. [PMID: 18231674 DOI: 10.1039/b713325a] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
In this work, a low power and robust electroactive microwell-based implantable drug delivery system, intended for use with autonomous microsystems, is presented. The device comprises of an upper silicon based structure in which the drug storage sites are defined and a lower electrically functionalized PDMS (polydimethylsiloxane) backing. The drug ejection mechanism developed here exploits localized electrokinetic effects to control both the release time and release rate of chemicals stored in independent well sites. It is shown how this can reduce the dosage time from hours to seconds over previous diffusion based approaches, using as little as 20 mJ of energy per dose. This paper focuses on presenting the design and characterizing the electrokinetic transport mechanics which govern the release time and dispersal pattern of the well contents using a series of experimental and numerical techniques.
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Affiliation(s)
- Aram J Chung
- Sibley School of Mechanical and Aerospace Engineering, Cornell University, Ithaca, NY 14853, USA
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Preparation of nano-emulsified paclitaxel using MPEG–PLGA diblock copolymers. Colloids Surf A Physicochem Eng Asp 2008. [DOI: 10.1016/j.colsurfa.2007.04.157] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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Park JS, Woo DG, Sun BK, Chung HM, Im SJ, Choi YM, Park K, Huh KM, Park KH. In vitro and in vivo test of PEG/PCL-based hydrogel scaffold for cell delivery application. J Control Release 2007; 124:51-9. [PMID: 17904679 DOI: 10.1016/j.jconrel.2007.08.030] [Citation(s) in RCA: 109] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2007] [Revised: 08/24/2007] [Accepted: 08/29/2007] [Indexed: 11/22/2022]
Abstract
Biodegradable elastic hydrogel scaffolds based on hydrophilic poly(ethylene glycol) (PEG) and hydrophobic poly(epsilon-caprolactone) (PCL) were fabricated and investigated as a delivery vehicle of rabbit chondrocytes for the formation of neocartilage. The diacrylated forms of PEG and PCL were used as building blocks to prepare a series of hydrogel scaffolds with different block compositions and, thus, different physico-chemical properties. The porous hydrogel scaffolds were prepared by using the salt leaching method that is generally used for the creation of porous scaffolds, and their in vitro cell interactions were examined using chondrocytes. The hydrogel scaffold with a relatively high PEG content showed better cell growth for chondrocytes, while the scaffold with a relatively low PEG content showed lower chondrogenic differentiation. It was observed that different kinds of scaffolds and rabbit chondrocytes were shown to have different swelling ratios in the scaffold for effective cell growth and tissue regeneration. RT-PCR results for the resultant cartilage tissue revealed that a PEG-PCL ratio of 14 to 6 scaffold was optimal for cartilage tissue formation in terms of collagen Type II, aggrecan, SOX9, and COMP gene expression. In addition, the hydrogel scaffold with a PEG-PCL ratio of 14 to 6 showed faster formation of new cartilage than those shown by other scaffolds.
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Affiliation(s)
- Ji Sun Park
- College of Medicine, Pochon CHA University, CHA Stem Cell Institute 606-16, Yeoksam 1-dong, Kangnam-gu, Seoul 135-081, Republic of Korea
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Lassalle V, Ferreira ML. PLA Nano- and Microparticles for Drug Delivery: An Overview of the Methods of Preparation. Macromol Biosci 2007; 7:767-83. [PMID: 17541922 DOI: 10.1002/mabi.200700022] [Citation(s) in RCA: 206] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
The controlled release of medicaments remains the most convenient way of drug delivery. Therefore, a wide variety of reports can be found in the open literature dealing with drug delivery systems. In particular, the use of nano- and microparticles devices has received special attention during the past two decades. PLA and its copolymers with GA and/or PEG appear as the preferred substrates to fabricate these devices. The methods of fabrication of these particles will be reviewed in this article, describing in detail the experimental variables associated with each one with regard to the influence of them on the performance of the particles as drug carriers. An analysis of the relationship between the method of preparation and the kind of drug to encapsulate is also included. Furthermore, certain issues involved in the addition of other monomeric substrates than lactic acid to the particles formulation as well as novel devices, other than nano- and microparticles, will be discussed in the present work considering the published literature available.
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Affiliation(s)
- Verónica Lassalle
- PLAPIQUI-UNS-CONICET, Planta Piloto de Ingeniería Química, Camino La Carrindanga Km 7, CC 717-8000 Bahía Blanca, Prov. Buenos Aires, Argentina.
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Lee SH, Zhang Z, Feng SS. Nanoparticles of poly(lactide)-tocopheryl polyethylene glycol succinate (PLA-TPGS) copolymers for protein drug delivery. Biomaterials 2007; 28:2041-50. [PMID: 17250886 DOI: 10.1016/j.biomaterials.2007.01.003] [Citation(s) in RCA: 75] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2006] [Accepted: 01/01/2007] [Indexed: 10/23/2022]
Abstract
Nanoparticles (NPs) of poly(lactide)-tocopheryl polyethylene glycol succinate (PLA-TPGS) copolymers with various PLA:TPGS component ratios were prepared by the double emulsion technique for protein drug formulation with bovine serum albumin (BSA) as a model protein. Influence of the PLA:TPGS component ratio and the BSA loading level on the drug encapsulation efficiency (EE) and in vitro drug release behavior was investigated. The PLA-TPGS NPs achieved 16.7% protein drug loading and 75.6% EE, which exhibited a biphasic pattern of controlled protein release with higher initial burst for those NPs of more TPGS content. Furthermore, the released proteins retained good structural integrity for at least 35 days at 37 degrees C as indicated by sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) and circular dichroism (CD) spectroscopy. Compared with other biodegradable polymeric NPs such as poly(D,L-lactide-co-glycolide) (PLGA) NPs, PLA-TPGS NPs could provide the encapsulated proteins a milder environment. Confocal laser scanning microscopy (CLSM) observation demonstrated the intracellular uptake of the PLA-TPGS NPs by NIH-3T3 fibroblast cells and Caco-2 cancer cells. This research suggests that PLA-TPGS NPs could be of great potential for clinical formulation of proteins and peptides.
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Affiliation(s)
- Sie Huey Lee
- NUS Nanoscience & Nanotechnology Initiative (NUSNNI), National University of Singapore, Block E5, #02-11, 4 Engineering Drive 4, Singapore 117576, Singapore
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Houchin ML, Heppert K, Topp EM. Deamidation, acylation and proteolysis of a model peptide in PLGA films. J Control Release 2006; 112:111-9. [PMID: 16529840 DOI: 10.1016/j.jconrel.2006.01.018] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2005] [Revised: 01/25/2006] [Accepted: 01/30/2006] [Indexed: 11/30/2022]
Abstract
The relative rates of deamidation, acylation and proteolysis (i.e. amide bond cleavage) were determined for a model peptide (VYPNGA) in poly (dl-lactide-co-glycolide) films. Films were stored at 70 degrees C and either 95%, 75%, 60%, 45%, 28%, or approximately 0% relative humidity and at 37 degrees C and 95% relative humidity. Peptide degradation products were identified by ESI+MS/MS and quantitated by LC/MS/MS. Extensive overlap of degradation mechanisms occurred, producing a complex mixture of products. Acylation was the dominant peptide degradation reaction (10-20% of total peptide) at early stages of PLGA hydrolysis and at intermediate relative humidity (60-45% RH). Deamidation and proteolysis were dominant (25-50% and 20-40% of total peptide, respectively) at later stages and at high relative humidity (95-75% RH). Understanding the relative rates of each peptide degradation reaction will allow for improved design of PLGA formulations that preserve the stability of peptide and protein drugs.
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Affiliation(s)
- M L Houchin
- Department of Pharmaceutical Chemistry, The University of Kansas, 2095 Constant Avenue, Lawrence, KS 66047, USA
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