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Ossama M, Lamie C, Tarek M, Wagdy HA, Attia DA, Elmazar MM. Management of recurrent aphthous ulcers exploiting polymer-based Muco-adhesive sponges : in-vitro and in-vivo evaluation. Drug Deliv 2021; 28:87-99. [PMID: 33342321 PMCID: PMC7758044 DOI: 10.1080/10717544.2020.1858999] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Recurrent aphthous ulcer (RAU) is a well-known painful, inflammatory disease with uncertain etiology for which local symptomatic therapy is only available. The aim of this study was to formulate and characterize muco-adhesive sponges containing a mixture of tenoxicam and miconazole nitrate to manage pain, inflammation and avoid candida infection that may accompany RAU due to poor oral hygiene. Two polymers at different concentrations were used to prepare sponges applying simple freeze-drying. Medicated chitosan (2%) sponges (mC2) showed acceptable physical appearance, surface pH (6.3 ± 0.042), porosity (25.7% ± 1.8), swelling index (5.7 ± 0.11), in-vivo and ex-vivo muco-adhesion time (115 min.±0.813 and 155 min.±1.537, respectively), ex-vivo muco-adhesion force (0.09 N ± 0.002) and scanning electron microscope (SEM) images. For concurrent clear-cut determination of tenoxicam and miconazole nitrate from mC2, a new UPLC method was developed and validated. mC2 sponges exhibited superior in-vitro drug release profiles where ∼100% of tenoxicam released within 5 min for fast pain relief with a more prolonged miconazole nitrate release. Furthermore, in-vivo animal study revealed that mC2 caused a significant decrease in the acetic acid-induced ulcer size in rats after 6 days of treatment (p < .0001) compared to negative and positive controls. Additionally, histopathological examination showed faster healing with complete restoration of the normal oral histology in rats. The present study concludes that chitosan sponge loaded with a combination of tenoxicam and miconazole nitrate could improve healing of RAU cases.
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Affiliation(s)
- Muhammed Ossama
- Department of Pharmaceutics and Pharmaceutical Technology, The British University in Egypt (BUE), Cairo, Egypt
| | - Caroline Lamie
- Department of Pharmaceutics and Pharmaceutical Technology, The British University in Egypt (BUE), Cairo, Egypt
| | - Mohamed Tarek
- Department of Pharmaceutical Chemistry, The British University in Egypt (BUE), Cairo, Egypt
| | - Hebatallah A Wagdy
- Department of Pharmaceutical Chemistry, The British University in Egypt (BUE), Cairo, Egypt
| | - Dalia A Attia
- Department of Pharmaceutics and Pharmaceutical Technology, The British University in Egypt (BUE), Cairo, Egypt
| | - Mohamed M Elmazar
- Department of Pharmacology and Biochemistry, The British University in Egypt (BUE), Cairo, Egypt
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Bakr RO, Amer RI, Attia D, Abdelhafez MM, Al-Mokaddem AK, El-Gendy AENG, El-Fishawy AM, Fayed MAA, Gad SS. In-vivo wound healing activity of a novel composite sponge loaded with mucilage and lipoidal matter of Hibiscus species. Biomed Pharmacother 2021; 135:111225. [PMID: 33434856 DOI: 10.1016/j.biopha.2021.111225] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2020] [Revised: 12/30/2020] [Accepted: 12/31/2020] [Indexed: 02/06/2023] Open
Abstract
Many researches have been undergone to hasten the natural wound healing process. In this study, several Hibiscus species (leaves) were extracted with petroleum ether, methanol, and their mucilage was separated. All the tested species extracts were assessed for their viability percentage using the water-soluble tetrazolium. H.syriacus was the plant of choice to be incorporated in a new drug delivery system and evaluated for its wound healing activity. H.syriacus petroleum ether extract (PEE) showed a high percentage of palmitic and oleic acids while its mucilage demonstrated high glucosamine and galacturonic acid. It was selected to be formulated and pharmaceutically evaluated into three different composite sponges using chitosan in various ratios. Fourier-transformed infrared spectroscopy investigated the chemical interaction between the utilized sponges' ingredients. Morphological characteristics were evaluated using scanning electron microscopy. H.syriacus composite sponge of mucilage: chitosan (1:5) was loaded with three different concentrations of PEE. Medicated formulations were assessed in rat model of excision wound model. The wound healing ability was clearly proved by the clinical acceleration, histopathological examination, and modulation of correlated inflammatory parameters as tumor necrosis factor in addition to vascular endothelial growth factor suggesting a promising valuable candidate that supports the management of excision wounds using single-dose preparation.
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Affiliation(s)
- Riham O Bakr
- Department of Pharmacognosy, Faculty of Pharmacy, October University for Modern Sciences and Arts (MSA), 11787, Giza, Egypt.
| | - Reham I Amer
- Department of Pharmaceutics and Industrial Pharmacy, Faculty of Pharmacy, Al-Azhar University, Cairo, Egypt; Department of Pharmaceutics, Faculty of Pharmacy, October University for Modern Sciences and Arts (MSA), Giza, Egypt
| | - Dalia Attia
- Department of Pharmaceutics and Pharmaceutical Technology, Faculty of Pharmacy, The British University in Egypt (BUE), Cairo, Egypt
| | - Mai M Abdelhafez
- Department of Pharmacology, Faculty of Pharmacy, October University for Modern Sciences and Arts (MSA), Giza, Egypt
| | - Asmaa K Al-Mokaddem
- Department of Pathology, Faculty of Veterinary Medicine, Cairo University, 12211 Giza, Egypt
| | - Abd El-Nasser G El-Gendy
- Department of Medicinal and Aromatic Plants Research, National Research Center, Giza, 12622, Egypt
| | - Ahlam M El-Fishawy
- Department of Pharmacognosy, Faculty of Pharmacy, Cairo University, 11562 Giza, Egypt
| | - Marwa A A Fayed
- Department of Pharmacognosy, Faculty of Pharmacy, University of Sadat City, 32897, Egypt
| | - Sameh S Gad
- Department of Pharmacology, Faculty of Pharmacy, October University for Modern Sciences and Arts (MSA), Giza, Egypt
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Abruzzo A, Crispini A, Prata C, Adduci R, Nicoletta FP, Dalena F, Cerchiara T, Luppi B, Bigucci F. Freeze-Dried Matrices for Buccal Administration of Propranolol in Children: Physico-Chemical and Functional Characterization. J Pharm Sci 2020; 110:1676-1686. [PMID: 33164786 DOI: 10.1016/j.xphs.2020.10.033] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2020] [Revised: 10/06/2020] [Accepted: 10/19/2020] [Indexed: 10/23/2022]
Abstract
Buccal matrices represent a widely accepted dosage form permitting a convenient, easy, reliable drug administration and reducing administration errors. The aim of this study was the development of mucoadhesive buccal matrices for propranolol administration in children. Matrices were obtained by freeze-drying of drug loaded polymeric solutions based on gum tragacanth (GT), pectin (PEC), hydroxypropylmethylcellulose (HPMC), sodium hyaluronate (HA), gelatin (GEL), chitosan (CH) or a mixture of CH and HPMC (CH/HPMC). Matrices were characterized for drug solid state, morphology, water-uptake, mucoadhesion ability, in vitro drug release and permeation through porcine epithelium. The most promising formulations were tested for in vitro biocompatibility in human dental pulp fibroblasts. The preparative method and the polymeric composition influenced the drug solid state, as a complete amorphization as well as different polymorphic forms were observed. GEL and PEC guaranteed a fast and complete drug release due to their rapid dissolution, while for the other matrices the release was influenced by drug diffusion through the viscous gelled matrix. Moreover, matrices based on CH and CH/HPMC showed the best mucoadhesive properties, favoured the drug permeation, in virtue of CH ability to interfere with the lipid organization of biological membrane, and were characterized by a good biocompatibility profile.
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Affiliation(s)
- Angela Abruzzo
- Department of Pharmacy and Biotechnology, University of Bologna, Via San Donato 19/2, 40127 Bologna, Italy.
| | - Alessandra Crispini
- Department of Chemistry and Chemical Technologies, University of Calabria, Via P. Bucci Edificio Polifunzionale, 87036 Arcavacata di Rende, Cosenza, Italy
| | - Cecilia Prata
- Department of Pharmacy and Biotechnology, University of Bologna, Via Irnerio 48, 40126 Bologna, Italy
| | - Rosanna Adduci
- Department of Chemistry and Chemical Technologies, University of Calabria, Via P. Bucci Edificio Polifunzionale, 87036 Arcavacata di Rende, Cosenza, Italy
| | - Fiore Pasquale Nicoletta
- Department of Pharmacy, Health and Nutritional Sciences, University of Calabria, Via P. Bucci Edificio Polifunzionale, 87036 Arcavacata di Rende, Cosenza, Italy
| | - Francesco Dalena
- Department of Chemistry and Chemical Technologies, University of Calabria, Via P. Bucci Edificio Polifunzionale, 87036 Arcavacata di Rende, Cosenza, Italy
| | - Teresa Cerchiara
- Department of Pharmacy and Biotechnology, University of Bologna, Via San Donato 19/2, 40127 Bologna, Italy
| | - Barbara Luppi
- Department of Pharmacy and Biotechnology, University of Bologna, Via San Donato 19/2, 40127 Bologna, Italy
| | - Federica Bigucci
- Department of Pharmacy and Biotechnology, University of Bologna, Via San Donato 19/2, 40127 Bologna, Italy
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Ziminska M, Wilson JJ, McErlean E, Dunne N, McCarthy HO. Synthesis and Evaluation of a Thermoresponsive Degradable Chitosan-Grafted PNIPAAm Hydrogel as a "Smart" Gene Delivery System. MATERIALS 2020; 13:ma13112530. [PMID: 32498464 PMCID: PMC7321466 DOI: 10.3390/ma13112530] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/18/2020] [Revised: 05/28/2020] [Accepted: 05/29/2020] [Indexed: 12/18/2022]
Abstract
Thermoresponsive hydrogels demonstrate tremendous potential as sustained drug delivery systems. However, progress has been limited as formulation of a stable biodegradable thermosensitive hydrogel remains a significant challenge. In this study, free radical polymerization was exploited to formulate a biodegradable thermosensitive hydrogel characterized by sustained drug release. Highly deacetylated chitosan and N-isopropylacrylamide with distinctive physical properties were employed to achieve a stable, hydrogel network at body temperature. The percentage of chitosan was altered within the copolymer formulations and the subsequent physical properties were characterized using 1H-NMR, FTIR, and TGA. Viscoelastic, swelling, and degradation properties were also interrogated. The thermoresponsive hydrogels were loaded with RALA/pEGFP-N1 nanoparticles and release was examined. There was sustained release of nanoparticles over three weeks and, more importantly, the nucleic acid cargo remained functional and this was confirmed by successful transfection of the NCTC-929 fibroblast cell line. This tailored thermoresponsive hydrogel offers an option for sustained delivery of macromolecules over a prolonged considerable period.
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Affiliation(s)
- Monika Ziminska
- School of Pharmacy, Queen’s University of Belfast, 97 Lisburn Road, Belfast BT9 7BL, UK; (M.Z.); (J.J.W.); (E.M.)
| | - Jordan J. Wilson
- School of Pharmacy, Queen’s University of Belfast, 97 Lisburn Road, Belfast BT9 7BL, UK; (M.Z.); (J.J.W.); (E.M.)
- School of Chemistry and Chemical Engineering, Queen’s University of Belfast, Belfast BT9 5AG, UK
| | - Emma McErlean
- School of Pharmacy, Queen’s University of Belfast, 97 Lisburn Road, Belfast BT9 7BL, UK; (M.Z.); (J.J.W.); (E.M.)
| | - Nicholas Dunne
- School of Pharmacy, Queen’s University of Belfast, 97 Lisburn Road, Belfast BT9 7BL, UK; (M.Z.); (J.J.W.); (E.M.)
- School of Mechanical and Manufacturing Engineering, Dublin City University, Dublin 9, Ireland
- Centre for Medical Engineering Research, School of Mechanical and Manufacturing Engineering, Dublin City University, Dublin 9, Ireland
- Department of Mechanical and Manufacturing Engineering, School of Engineering, Trinity College Dublin, Dublin 2, Ireland
- Advanced Manufacturing Research Centre (I-Form), School of Mechanical and Manufacturing Engineering, Dublin City University, Glasnevin, Dublin 9, Ireland
- Advanced Materials and Bioengineering Research Centre (AMBER), Trinity College Dublin, Dublin 9, Ireland
- Advanced Processing Technology Research Centre, Dublin City University, Dublin 9, Ireland
- Trinity Centre for Biomedical Engineering, Trinity Biomedical Sciences Institute, Trinity College Dublin, Dublin 2, Ireland
- Correspondence: (N.D.); (H.O.M.); Tel.: +353-(0)1-7005712 (N.D.); +44-(0)28-90972149/1993 (H.O.M.)
| | - Helen O. McCarthy
- School of Pharmacy, Queen’s University of Belfast, 97 Lisburn Road, Belfast BT9 7BL, UK; (M.Z.); (J.J.W.); (E.M.)
- School of Chemical Sciences, Dublin City University, Dublin 9, Ireland
- Correspondence: (N.D.); (H.O.M.); Tel.: +353-(0)1-7005712 (N.D.); +44-(0)28-90972149/1993 (H.O.M.)
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Exploiting polymer blending approach for fabrication of buccal chitosan-based composite sponges with augmented mucoadhesive characteristics. Eur J Pharm Sci 2018; 120:10-19. [DOI: 10.1016/j.ejps.2018.04.041] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2018] [Revised: 03/22/2018] [Accepted: 04/27/2018] [Indexed: 12/15/2022]
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Lyophilized sponges loaded with curcumin solid lipid nanoparticles for buccal delivery: Development and characterization. Int J Pharm 2015; 492:248-57. [DOI: 10.1016/j.ijpharm.2015.06.022] [Citation(s) in RCA: 65] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2015] [Revised: 06/12/2015] [Accepted: 06/14/2015] [Indexed: 12/20/2022]
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7
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Hazzah HA, Farid RM, Nasra MMA, Zakaria M, Gawish Y, El-Massik MA, Abdallah OY. A new approach for treatment of precancerous lesions with curcumin solid-lipid nanoparticle-loaded gels: in vitro and clinical evaluation. Drug Deliv 2015; 23:1409-19. [PMID: 26146889 DOI: 10.3109/10717544.2015.1065524] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
OBJECTIVE Preparation and characterization of curcumin solid-lipid nanoparticle (CurSLN)-loaded mucoadhesive gel for local treatment of oral precancerous lesions with low dose. METHODOLOGY The formulated CurSLNs were dispersed in a mucoadhesive gel matrix to be applied to the buccal mucosa. Conventional mucoadhesive gel using binary system was adopted. The prepared gels were evaluated for in vitro drug dialysis, ex vivo mucoadhesion test and ex vivo permeation study using chicken buccal mucosa. Short-term clinical evaluation was carried out on 10 patients suffering oral erythroplakia in terms of pain index and lesion size measurement. (1) RESULTS: The results showed that the loaded gel with CurSLN showed good mucoadhesion property and 25 min in vivo residence time. In addition to stability enhancement for the Cur powder. All formulae did not show any drug permeated, however, significant amount of Cur was retained within the chicken buccal mucosal tissue confirmed by histological examination. Significant reduction in pain, and complete healing was observed after 6 weeks of treatment. CONCLUSION The local use of Cur in low dose is a promising option for treatment of precancerous lesions. The lack of local anti-inflammatory compounds with reduced side effects intensifies the importance of studying natural products for this purpose.
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Affiliation(s)
- Heba A Hazzah
- a Department of Pharmaceutics, Faculty of Pharmacy and Drug Manufacturing , Pharos University in Alexandria , Alexandria , Egypt
| | - Ragwa M Farid
- a Department of Pharmaceutics, Faculty of Pharmacy and Drug Manufacturing , Pharos University in Alexandria , Alexandria , Egypt
| | - Maha M A Nasra
- b Department of Pharmaceutics, Faculty of Pharmacy , and
| | - Mennatallah Zakaria
- c Department of Oral Medicine, Periodontology, Oral Diagnosis and Radiology, Faculty of Dentistry , Alexandria University , Alexandria , Egypt
| | - Yousria Gawish
- c Department of Oral Medicine, Periodontology, Oral Diagnosis and Radiology, Faculty of Dentistry , Alexandria University , Alexandria , Egypt
| | - Magda A El-Massik
- a Department of Pharmaceutics, Faculty of Pharmacy and Drug Manufacturing , Pharos University in Alexandria , Alexandria , Egypt
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Kassem AA, Ismail FA, Naggar VF, Aboulmagd E. Comparative study to investigate the effect of meloxicam or minocycline HCl in situ gel system on local treatment of periodontal pockets. AAPS PharmSciTech 2014; 15:1021-8. [PMID: 24831089 PMCID: PMC4113610 DOI: 10.1208/s12249-014-0118-7] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2013] [Accepted: 03/31/2014] [Indexed: 11/30/2022] Open
Abstract
In situ gelling formulations allow easy application to the target area. Gelation is induced by physiological stimuli at the site of application where the formula attains semisolid properties and exerts sustained drug release. In situ gelling formulations containing either 3% meloxicam (Mx) or 2% minocycline HCl (MH) were prepared for local application into the periodontal pockets. Gel formulations were based on the thermosensitive Pluronic(®) (Pl) and the pH-sensitive Carbopol(®) (C) polymers. C gels were prepared in combination with HPMC (H) to decrease its acidity. The total percent drug released from Pl formulae was 21.72% after 1 week for Mx and 85% after 3 days for MH. Their release kinetics data indicated anomalous non-Fickian behavior that could be controlled by both diffusion and chain relaxation. Addition of MH to C/H gels (1:2.5) resulted in liquefaction, followed by drug precipitation. Regarding C/H gel containing Mx, it showed a prolonged release rate up to 7 days with an initial burst effect; the kinetics data revealed Fickian-diffusion mechanism. The in vitro antibacterial activity studies for MH gel in Pl revealed that the drug released exceeded the minimum inhibitory concentration (MIC) of MH against Staphylococcus aureus ATCC 6538; placebo gel showed no effect on the microorganism. Clinical evaluation of Pl gels containing either Mx or MH showed significant improvement in chronic periodontitis patients, manifested by decrease in pocket depth and gingival index and increase in bone density.
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Affiliation(s)
- Abeer Ahmed Kassem
- Department of Pharmaceutics, Faculty of Pharmacy, Alexandria University, Alexandria, Egypt,
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Kouchak M. In Situ Gelling Systems for Drug Delivery. Jundishapur J Nat Pharm Prod 2014; 9:e20126. [PMID: 25237648 PMCID: PMC4165193 DOI: 10.17795/jjnpp-20126] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2014] [Accepted: 05/19/2014] [Indexed: 11/25/2022] Open
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10
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Labib GS, Farid RM. Osteogenic effect of locally applied Pentoxyfilline gel:in vitroandin vivoevaluations. Drug Deliv 2014; 22:1094-1102. [DOI: 10.3109/10717544.2014.884193] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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11
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Solvent induced phase inversion-based in situ forming controlled release drug delivery implants. J Control Release 2014; 176:8-23. [DOI: 10.1016/j.jconrel.2013.12.020] [Citation(s) in RCA: 75] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2013] [Revised: 12/17/2013] [Accepted: 12/19/2013] [Indexed: 01/04/2023]
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12
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Injected Depot DDS. Biomater Sci 2013. [DOI: 10.1016/b978-0-08-087780-8.00098-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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13
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Kayabaşi GK, Aydin RST, Gümüşderelioğlu M. In vitro chondrogenesis by BMP6 gene therapy. J Biomed Mater Res A 2012; 101:1353-61. [PMID: 23077084 DOI: 10.1002/jbm.a.34430] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2012] [Revised: 08/23/2012] [Accepted: 08/28/2012] [Indexed: 11/10/2022]
Abstract
In this study, the promotion of in vitro chondrogenesis was investigated by using chitosan scaffolds and rat bone marrow-derived mesenchymal stem cells (rBMSCs) which are transfected by BMP6 (bone morphogenetic protein-6) encoding gene. For this purpose, plasmid DNA (pShuttle-rBMP6), the expression vector consisting of the coding sequence of the BMP6 was obtained, and then, it was entrapped in chitosan scaffolds to obtain a gene-activated matrix (GAM). The chitosan scaffolds performed the controlled and sustained release of plasmid DNA, thus they continuously provided the modification of rBMSCs to induce chondrogenic differentiation. In addition, the cells were transfected by lipid-based agent (Lipofectamine) and then, these modified cells were inoculated into the chitosan scaffolds. Furthermore, a group of chitosan scaffolds with nontransfected rBMSCs with recombinant BMP6 free in culture medium was used as control. Comparative results showed that, mitochondrial activities of modified rBMSCs by Lipofectamine and chitosan GAM were significantly higher than those of nontransfected rBMSCs. The observations from scanning electron microscopy analysis confirmed that BMP6 gene-modified rBMSCs differentiated to the chondrogenic phenotype. Highest amount of glycosaminoglycan contents of rBMSCs on GAM concluded that BMP6 gene-activated chitosan scaffold has a potential in the application of cartilage regeneration.
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Affiliation(s)
- Gonca Karagöz Kayabaşi
- Nanotechnology and Nanomedicine Department, Hacettepe University, Beytepe, Ankara, Turkey
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Madan M, Bajaj A, Lewis S, Udupa N, Baig JA. In situ forming polymeric drug delivery systems. Indian J Pharm Sci 2011; 71:242-51. [PMID: 20490289 PMCID: PMC2865781 DOI: 10.4103/0250-474x.56015] [Citation(s) in RCA: 90] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2008] [Revised: 04/01/2009] [Accepted: 05/10/2009] [Indexed: 11/27/2022] Open
Abstract
In situ forming polymeric formulations are drug delivery systems that are in sol form before administration in the body, but once administered, undergo gelation in situ, to form a gel. The formation of gels depends on factors like temperature modulation, pH change, presence of ions and ultra violet irradiation, from which the drug gets released in a sustained and controlled manner. Various polymers that are used for the formulation of in situ gels include gellan gum, alginic acid, xyloglucan, pectin, chitosan, poly(DL-lactic acid), poly(DL-lactide-co-glycolide) and poly-caprolactone. The choice of solvents like water, dimethylsulphoxide, N-methyl pyrrolidone, triacetin and 2-pyrrolidone for these formulations depends on the solubility of polymer used. Mainly in situ gels are administered by oral, ocular, rectal, vaginal, injectable and intraperitoneal routes. The in situ gel forming polymeric formulations offer several advantages like sustained and prolonged action in comparison to conventional drug delivery systems. The article presents a detailed review of these types of polymeric systems, their evaluation, advancements and their commercial formulations. From a manufacturing point of view, the production of such devices is less complex and thus lowers the investment and manufacturing cost.
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Affiliation(s)
- M Madan
- C. U. Shah College of Pharmacy, S. N. D.T. Women's University, Mumbai-400 049, India
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15
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The use of carboxymethylcellulose gel to increase non-viral gene transfer in mouse airways. Biomaterials 2009; 31:2665-72. [PMID: 20022367 DOI: 10.1016/j.biomaterials.2009.12.005] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2009] [Accepted: 12/01/2009] [Indexed: 11/21/2022]
Abstract
We have assessed whether viscoelastic gels known to inhibit mucociliary clearance can increase lipid-mediated gene transfer. Methylcellulose or carboxymethylcellulose (0.25-1.5%) was mixed with complexes of the cationic lipid GL67A and plasmids encoding luciferase and perfused onto the nasal epithelium of mice. Survival after perfusion with 1% CMC or 1% MC was 90 and 100%, respectively. In contrast 1.5% CMC was uniformly lethal likely due to the viscous solution blocking the airways. Perfusion with 0.5% CMC containing lipid/DNA complexes reproducibly increased gene expression by approximately 3-fold (n=16, p<0.05). Given this benefit, likely related to increased duration of contact, we also assessed the effect of prolonging contact time of the liposome/DNA complexes by delivering our standard 80 microg DNA dose over either approximately 22 or 60 min of perfusion. This independently increased gene transfer by 6-fold (n=8, p<0.05) and could be further enhanced by the addition of 0.5% CMC, leading to an overall 25-fold enhancement (n=8, p<0.001) in gene expression. As a result of these interventions CFTR transgene mRNA transgene levels were increased several logs above background. Interestingly, this did not lead to correction of the ion transport defects in the nasal epithelium of cystic fibrosis mice nor for immunohistochemical quantification of CFTR expression. To assess if 0.5% CMC also increased gene transfer in the mouse lung, we used whole body nebulisation chambers. CMC was nebulised for 1h immediately before, or simultaneously with GL67A/pCIKLux. The former did not increase gene transfer, whereas co-administration significantly increased gene transfer by 4-fold (p<0.0001, n=18). This study suggests that contact time of non-viral gene transfer agents is a key factor for gene delivery, and suggests two methods which may be translatable for use in man.
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16
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Spadaccio C, Chello M, Trombetta M, Rainer A, Toyoda Y, Genovese JA. Drug releasing systems in cardiovascular tissue engineering. J Cell Mol Med 2009; 13:422-39. [PMID: 19379142 PMCID: PMC3822506 DOI: 10.1111/j.1582-4934.2008.00532.x] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Abstract
Heart disease and atherosclerosis are the leading causes of morbidity and mortality worldwide. The lack of suitable autologous grafts has produced a need for artificial grafts; however, current artificial grafts carry significant limitations, including thrombosis, infection, limited durability and the inability to grow. Tissue engineering of blood vessels, cardiovascular structures and whole organs is a promising approach for creating replacement tissues to repair congenital defects and/or diseased tissues. In an attempt to surmount the shortcomings of artificial grafts, tissue-engineered cardiovascular graft (TECVG), constructs obtained using cultured autologous vascular cells seeded onto a synthetic biodegradable polymer scaffold, have been developed. Autologous TECVGs have the potential advantages of growth, durability, resistance to infection, and freedom from problems of rejection, thrombogenicity and donor scarcity. Moreover polymers engrafted with growth factors, cytokines, drugs have been developed allowing drug-releasing systems capable of focused and localized delivery of molecules depending on the environmental requirements and the milieu in which the scaffold is placed. A broad range of applications for compound-releasing, tissue-engineered grafts have been suggested ranging from drug delivery to gene therapy. This review will describe advances in the development of drug-delivery systems for cardiovascular applications focusing on the manufacturing techniques and on the compounds delivered by these systems to date.
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Affiliation(s)
- Cristiano Spadaccio
- Cardiac and Molecular Biology Laboratory, Heart, Lung & Esophageal Surgery Institute University of Pittsburgh Medical Center, Pittsburgh, PA, USA
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17
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Agarwal A, Unfer RC, Mallapragada SK. Dual-role self-assembling nanoplexes for efficient gene transfection and sustained gene delivery. Biomaterials 2008; 29:607-17. [DOI: 10.1016/j.biomaterials.2007.10.010] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2007] [Accepted: 10/05/2007] [Indexed: 11/25/2022]
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RAWAT M, SINGH D, SARAF S, SARAF S. Lipid Carriers: A Versatile Delivery Vehicle for Proteins and Peptides. YAKUGAKU ZASSHI 2008; 128:269-80. [DOI: 10.1248/yakushi.128.269] [Citation(s) in RCA: 78] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Affiliation(s)
- Manju RAWAT
- Institute of Pharmacy, Pt Ravishankar Shukla University
| | | | - S. SARAF
- Institute of Pharmacy, Pt Ravishankar Shukla University
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Van Tomme SR, Mens A, van Nostrum CF, Hennink WE. Macroscopic Hydrogels by Self-Assembly of Oligolactate-Grafted Dextran Microspheres. Biomacromolecules 2007; 9:158-65. [DOI: 10.1021/bm700931q] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Sophie R. Van Tomme
- Department of Pharmaceutics, Utrecht Institute for Pharmaceutical Sciences (UIPS), Utrecht University, P.O. Box 80082, 3508 TB Utrecht, The Netherlands, Inorganic Chemistry and Catalysis Group, Department of Chemistry, Faculty of Science, Utrecht University, P.O. Box 80083, 3508 TB Utrecht, The Netherlands
| | - Ad Mens
- Department of Pharmaceutics, Utrecht Institute for Pharmaceutical Sciences (UIPS), Utrecht University, P.O. Box 80082, 3508 TB Utrecht, The Netherlands, Inorganic Chemistry and Catalysis Group, Department of Chemistry, Faculty of Science, Utrecht University, P.O. Box 80083, 3508 TB Utrecht, The Netherlands
| | - Cornelus F. van Nostrum
- Department of Pharmaceutics, Utrecht Institute for Pharmaceutical Sciences (UIPS), Utrecht University, P.O. Box 80082, 3508 TB Utrecht, The Netherlands, Inorganic Chemistry and Catalysis Group, Department of Chemistry, Faculty of Science, Utrecht University, P.O. Box 80083, 3508 TB Utrecht, The Netherlands
| | - Wim E. Hennink
- Department of Pharmaceutics, Utrecht Institute for Pharmaceutical Sciences (UIPS), Utrecht University, P.O. Box 80082, 3508 TB Utrecht, The Netherlands, Inorganic Chemistry and Catalysis Group, Department of Chemistry, Faculty of Science, Utrecht University, P.O. Box 80083, 3508 TB Utrecht, The Netherlands
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20
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Pearton M, Allender C, Brain K, Anstey A, Gateley C, Wilke N, Morrissey A, Birchall J. Gene delivery to the epidermal cells of human skin explants using microfabricated microneedles and hydrogel formulations. Pharm Res 2007; 25:407-16. [PMID: 17671832 DOI: 10.1007/s11095-007-9360-y] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2007] [Accepted: 05/25/2007] [Indexed: 10/23/2022]
Abstract
PURPOSE Microneedles disrupt the stratum corneum barrier layer of skin creating transient pathways for the enhanced permeation of therapeutics into viable skin regions without stimulating pain receptors or causing vascular damage. The cutaneous delivery of nucleic acids has a number of therapeutic applications; most notably genetic vaccination. Unfortunately non-viral gene expression in skin is generally inefficient and transient. This study investigated the potential for improved delivery of plasmid DNA (pDNA) in skin by combining the microneedle delivery system with sustained release pDNA hydrogel formulations. MATERIALS AND METHODS Microneedles were fabricated by wet etching silicon in potassium hydroxide. Hydrogels based on Carbopol polymers and thermosensitive PLGA-PEG-PLGA triblock copolymers were prepared. Freshly excised human skin was used to characterise microneedle penetration (microscopy and skin water loss), gel residence in microchannels, pDNA diffusion and reporter gene (beta-galactosidase) expression. RESULTS Following microneedle treatment, channels of approximately 150-200 microm depth increased trans-epidermal water loss in skin. pDNA hydrogels were shown to harbour and gradually release pDNA. Following microneedle-assisted delivery of pDNA hydrogels to human skin expression of the pCMVbeta reporter gene was demonstrated in the viable epidermis proximal to microchannels. CONCLUSIONS pDNA hydrogels can be successfully targeted to the viable epidermis to potentially provide sustained gene expression therein.
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Affiliation(s)
- Marc Pearton
- Gene Delivery Research Group, Welsh School of Pharmacy, Cardiff University, Cardiff, CF10 3XF, UK
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21
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Guo T, Zhao J, Chang J, Ding Z, Hong H, Chen J, Zhang J. Porous chitosan-gelatin scaffold containing plasmid DNA encoding transforming growth factor-β1 for chondrocytes proliferation. Biomaterials 2006; 27:1095-103. [PMID: 16143394 DOI: 10.1016/j.biomaterials.2005.08.015] [Citation(s) in RCA: 90] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2005] [Accepted: 08/10/2005] [Indexed: 11/24/2022]
Abstract
Cartilage defects as a result of disease or injury have a very limited ability to heal spontaneously. Recently, tissue engineering and local therapeutic gene delivery systems have been paid much attention in the cartilage natural healing process. Gene-activated matrix (GAM) blends these two strategies, serving as local bioreactor with therapeutic agents expression and also providing a structural template to fill the lesion defects for cell adhesion, proliferation and synthesis of extracellular matrix (ECM). In the current study, we used chitosan-gelatin complex as biomaterials to fabricate three-dimensional scaffolds and plasmid DNA were entrapped in the scaffolds encoding transforming growth factor-beta1 (TGF-beta1), which has been proposed as a promoter of cartilage regeneration for its effect on the synthesis of matrix molecules and cell proliferation. The plasmid DNA incorporated in the scaffolds showed a burst release in the first week and a sustained release for the other 2 weeks. The gene transfectd into chondrocytes expresses TGF-beta1 protein stably in 3 weeks. The histological and immunohistochemical results confirmed that the primary chondrocytes cultured into the chitosan-gelatin scaffold maintained round and owned characters of high secretion of specific ECM. From this study, it can be concluded that this gene-activated chitosan-gelatins matrix has a potential in the application of cartilage defects regeneration.
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Affiliation(s)
- Ting Guo
- State Key Laboratory of Pharmaceutical Biotechnology, Department of Biochemistry, Nanjing University, Nanjing 210093, PR China
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22
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Kasper FK, Seidlits SK, Tang A, Crowther RS, Carney DH, Barry MA, Mikos AG. In vitro release of plasmid DNA from oligo(poly(ethylene glycol) fumarate) hydrogels. J Control Release 2005; 104:521-39. [PMID: 15911051 DOI: 10.1016/j.jconrel.2005.03.008] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2004] [Revised: 03/08/2005] [Accepted: 03/08/2005] [Indexed: 11/29/2022]
Abstract
This research investigates the release of plasmid DNA in vitro from novel, injectable hydrogels based on the polymer oligo(poly(ethylene glycol) fumarate) (OPF). These biodegradable hydrogels can be crosslinked under physiological conditions to physically entrap plasmid DNA. The DNA release kinetics were characterized fluorescently with the PicoGreen and OliGreen Reagents as well as through the use of radiolabeled plasmid. Further, the ability of the released DNA to be expressed was assessed through bacterial transformations. It was found that plasmid DNA can be released in a sustained, linear fashion over the course of 45-62 days, with the release kinetics depending upon the molecular weight of the poly(ethylene glycol) from which the OPF was synthesized. Two formulations of OPF were synthesized from poly(ethylene glycol) of a nominal molecular weight of either 3.35K (termed OPF 3K) or 10K (termed OPF 10K). By the time the gels had completely degraded, 97.8+/-0.3% of the initially loaded DNA was recovered from OPF 3K hydrogels, with 80.8+/-1.9% of the initial DNA retaining its double-stranded form. Likewise, for OPF 10K gels, 92.1+/-4.3% of the initially loaded DNA was recovered upon complete degradation of the gels, with 81.6+/-3.8% of the initial DNA retaining double-stranded form. Experiments suggest that the release of plasmid DNA from OPF hydrogels is dominated by the degradation of the gels. Bacterial transformation results indicated that the DNA retained bioactivity over the course of 42 days of release. Thus, these studies demonstrate the potential of OPF hydrogels in controlled gene delivery applications.
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Affiliation(s)
- F Kurtis Kasper
- Department of Bioengineering, Rice University, PO Box 1892, MS-142, Houston, TX 77251-1892, USA
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Sinn PL, Shah AJ, Donovan MD, McCray PB. Viscoelastic gel formulations enhance airway epithelial gene transfer with viral vectors. Am J Respir Cell Mol Biol 2005; 32:404-10. [PMID: 15695737 DOI: 10.1165/rcmb.2004-0410oc] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
Advances in gene transfer to the conducting airways for the treatment of pulmonary diseases such as cystic fibrosis have identified several vector classes that transduce airway epithelia in vitro and in animal models. One barrier to epithelial gene transfer is the rapid removal of materials from the airway surface via mucociliary clearance. This host defense mechanism limits gene transfer efficiency to airway epithelial cells. Here we show that formulation of gene transfer vectors with viscoelastic gels provides longer epithelial residence time and increases vector-mediated gene transfer efficiency. Gene transfer with adenoviral, adeno-associated, and lentiviral vectors all significantly improved after formulation with viscoelastic gels designed to slow mucociliary clearance. Importantly, viscoelastic gel formulations enhanced vector transduction to the conducting airways, the desired treatment target for diseases such as cystic fibrosis.
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Affiliation(s)
- Patrick L Sinn
- Department of Pediatrics, 240G EMRB, The University of Iowa, Iowa City, IA 52242, USA
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24
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Kushibiki T, Tomoshige R, Tabata Y. Controlled release of plasmid DNA by cationized gelatin hydrogel. ACTA ACUST UNITED AC 2004. [DOI: 10.2492/jsir.24.634] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Meilander NJ, Pasumarthy MK, Kowalczyk TH, Cooper MJ, Bellamkonda RV. Sustained release of plasmid DNA using lipid microtubules and agarose hydrogel. J Control Release 2003; 88:321-31. [PMID: 12628338 DOI: 10.1016/s0168-3659(03)00007-5] [Citation(s) in RCA: 63] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Non-viral gene therapy typically results in low transfection efficiencies and transient gene expression. To address these limitations, two sustained delivery systems capable of releasing functional, compacted DNA for over 50 days were designed. A luciferase plasmid was compacted with a polylysine-polyethylene glycol conjugate and released from agarose hydrogel and lipid microtubule-hydrogel delivery systems for over 50 days. The released DNA was characterized structurally using sedimentation, electron microscopy, and serum stability, and functionally using in vitro transfections. The released DNA retained its physical compaction and nuclease resistance and was converted from supercoiled to nicked and linear forms. Released compacted DNA produced significant gene expression in vitro, although at lower levels than freshly compacted DNA. Thus, hydrogels and lipid microtubules successfully provided the slow release of bioactive, compacted DNA.
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Affiliation(s)
- Nancy J Meilander
- Biomaterials, Cell and Tissue Engineering Laboratory, Department of Biomedical Engineering, Case Western Reserve University, Wickenden Bldg. #319, 10900 Euclid Ave., Cleveland, OH 44106-7207, USA
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Vernon B, Tirelli N, Bächi T, Haldimann D, Hubbell JA. Water-borne, in situ crosslinked biomaterials from phase-segregated precursors. J Biomed Mater Res A 2003; 64:447-56. [PMID: 12579558 DOI: 10.1002/jbm.a.10369] [Citation(s) in RCA: 81] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
A novel process for the preparation of water-borne biomaterials for hard tissue repair from injectable precursors is described, where the precursors form crosslinked materials in situ under physiological conditions. The precursors react by means of a Michael-type addition reaction that makes use of addition donors such as pentaerythritol tetrakis 3'-mercaptopropionate (QT) and addition acceptors such as poly(ethylene glycol) diacrylate 570 MW (PEGDA), pentaerythritol triacrylate (TA), and poly(propylene glycol) diacrylate 900 MW (PPODA). These crosslinked materials (at 75 wt% solid), prepared from water dispersions or reverse emulsions, showed ultimate strengths in compression of 1.8 +/- 0.2 and 6.7 +/- 0.5 MPa and ultimate deformations of 35 +/- 2+/- and 37 +/- 2%, respectively. Scanning electron microscopy (SEM) shows that the morphology of the precursors templated the morphology of the final materials. The current study indicates that it is possible to obtain injectable high-modulus materials that have appropriate mechanical properties and gelation kinetics for tissue augmentation and stabilization applications such as mechanical stabilization of the intervertebral disc annulus.
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Affiliation(s)
- Brent Vernon
- Department of Materials, Institute of Biomedical Engineering, Swiss Federal Institute of Technology (ETH), Moussonstrasse 18, CH-8044 Zurich, Switzerland
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Jozkowicz A, Fügl A, Nanobashvili J, Neumayer C, Dulak J, Valentini D, Funovics P, Polterauer P, Redl H, Huk I. Delivery of high dose VEGF plasmid using fibrin carrier does not influence its angiogenic potency. Int J Artif Organs 2003; 26:161-9. [PMID: 12653351 DOI: 10.1177/039139880302600211] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Delivery of DNA mixed with a degradable matrix carrier was supposed to improve transgene expression. Using a rabbit hind-limb ischemia model, we tested the angiogenic potency of plasmid encoding human vascular endothelial growth factor (pSG5-VEGF165) entrapped in fibrin sealant. Animals were injected intramuscularly with 500 microg of pSG5-VEGF165 or control plasmid, dissolved in saline (PBS) or fibrin glue. After 14 days, presence of delivered constructs and expression of transgene was confirmed in injected muscles of all animals. There were no significant differences in the levels of human VEGF mRNA and protein between VEGF-PBS and VEGF-fibrin groups (Mann-Whitney test). Accordingly, pSG5-VEGF165 regardless of the way of delivery, induced similar increases in capillary density within treated muscles (ANOVA). Control plasmid did not show any effects. In conclusion, injection of pSG5-VEGF165 into ischemic adductor muscle leads to synthesis of human VEGF and increases the number of capillaries. Fibrin carrier does not influence its angiogenic potential.
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Affiliation(s)
- A Jozkowicz
- Department of Vascular Surgery, University of Vienna, Vienna, Austria.
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Gimeno MJ, García-Esteo F, García-Honduvilla N, San Román J, Bellón JM, Buján J. A novel controlled drug-delivery system for growth hormone applied to healing skin wounds in diabetic rats. JOURNAL OF BIOMATERIALS SCIENCE-POLYMER EDITION 2003; 14:821-35. [PMID: 14533860 DOI: 10.1163/156856203768366549] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Controlled release systems for drugs, hormones and growth factors can be particularly useful in tissue repair processes. These systems act as a biodegradable support containing the substance to be delivered, allowing their gradual release. In the past years, the local application of growth factors has acquired special relevance as a therapeutic option for use in subjects who show deficient tissue scarring, the hormone dose being the limiting factor for its success. In this study, the in vitro biocompatibility of a copolymer formed by vinylpyrrolidone and 2-hydroxyethyl methacrylate, used as an administration vehicle for hGH, was evaluated. The system was then tested in vivo in terms of its capacity for healing incisional wounds in healthy and diabetic rats. For the in vitro studies, polymer and hormone degradation rates were determined, and polymer biocompatibility was evaluated in fibroblast cultures. In the in vivo experiments, an incision was made in the back of the animals, and polymers discs with/without hGH, were introduced in the aperture. Morphological, immunohistochemical and morphometric evaluations were performed on wound tissue specimens 3-10 days after surgery. In vitro, the polymer was found to be biodegradable and showed no toxic effects on fibroblasts, the hormone being slowly released to the culture medium. In untreated diabetic rats, a delayed skin scarring and cell response were observed, compared to that noted in healthy animals. Skin closure, keratinisation and fibrosis occurred earlier in the presence of the polymer-hGH system. The use of this co-polymer as an administration vehicle for hGH improves the wound scarring process in the pathological setting of diabetes.
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Affiliation(s)
- M J Gimeno
- Departamento de Ciencias Morfológicas y Cirugía, Facultad de Medicina, Universidad de Alcalá, Ctra N-II, Km 33.600, 28871 Alcalá de Henares, Madrid, Spain
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Abstract
The ability to inject a drug incorporated into a polymer to a localized site and have the polymer form a semi-solid drug depot has a number of advantages. Among these advantages is ease of application and localized, prolonged drug delivery. For these reasons a large number of in situ setting polymeric delivery systems have been developed and investigated for use in delivering a wide variety of drugs. In this article we introduce the various strategies that have been used to prepare in situ setting systems, and outline their advantages and disadvantages as localized drug delivery systems.
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Affiliation(s)
- A Hatefi
- Faculty of Pharmacy and Pharmaceutical Sciences, University of Alberta, Edmonton, Alberta T6G 2N8, Canada
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Park JS, Oh YK, Yoon H, Kim JM, Kim CK. In situ gelling and mucoadhesive polymer vehicles for controlled intranasal delivery of plasmid DNA. JOURNAL OF BIOMEDICAL MATERIALS RESEARCH 2002; 59:144-51. [PMID: 11745547 DOI: 10.1002/jbm.1227] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Nasal administration of plasmid DNA is emerging as a new route of delivery for therapeutic genes and DNA vaccines. To improve the intranasal absorption of plasmid DNA, we designed delivery systems composed of in situ gelling and mucoadhesive polymers. Poloxamers (Pol) were used to provide in situ gelling property. Polycarbophil (PC) or polyethylene oxide (PEO) was used as mucoadhesive polymers. The gelation temperatures of the formulations slightly decreased by the mucoadhesive polymers, but not by plasmid DNA. The in vitro release of plasmid DNA from the gels followed Fickian diffusion. The absorption of plasmid DNA varied with the contents and type of mucoadhesive polymers. Of vehicles, Pol/PC 0.2% showed the highest absorption with an area under the curve value 11-fold higher than saline, the conventional vehicle. The nasal retention of plasmid DNA was highly prolonged by mucoadhesive polymers. At 3 h postdose, the nasal tissue levels of plasmid DNA given in Pol/PC and Pol/PEO 0.8% were 10- and 40-fold higher relative to saline. The histopathology of nasal tissues was not altered after repeated dosing over 2 weeks. The mRNA expression of plasmid DNA delivered by Pol or Pol/PEO 0.4% was observed in the nasal tissues. These results indicate that the nasal absorption of plasmid DNA can be effectively and safely enhanced by using in situ gelling and mucoadhesive polymer-based vehicles.
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Affiliation(s)
- Jeong-Sook Park
- College of Pharmacy, Seoul National University, San 56-1, Shinlim-Dong, Kwanak-Ku, Seoul 151-742, South Korea
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