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Abdelnabi D, Lastakchi S, Watts C, Atkins H, Hingtgen S, Valdivia A, McConville C. Local administration of irinotecan using an implantable drug delivery device stops high-grade glioma tumor recurrence in a glioblastoma tumor model. Drug Deliv Transl Res 2024; 14:3070-3088. [PMID: 38319555 PMCID: PMC11445345 DOI: 10.1007/s13346-024-01524-x] [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] [Accepted: 01/16/2024] [Indexed: 02/07/2024]
Abstract
The treatment for Glioblastoma is limited due to the presence of the blood brain barrier, which restricts the entry of chemotherapeutic drugs into the brain. Local delivery into the tumor resection margin has the potential to improve efficacy of chemotherapy. We developed a safe and clinically translatable irinotecan implant for local delivery to increase its efficacy while minimizing systemic side effects. Irinotecan-loaded implants were manufactured using hot melt extrusion, gamma sterilized at 25 kGy, and characterized for their irinotecan content, release, and drug diffusion. Their therapeutic efficacy was evaluated in a patient-derived xenograft mouse resection model of glioblastoma. Their safety and translatability were evaluated using histological analysis of brain tissue and serum chemistry analysis. Implants containing 30% and 40% w/w irinotecan were manufactured without plasticizer. The 30% and 40% implants showed moderate local toxicity up to 2- and 6-day post-implantation. Histopathology of the implantation site showed signs of necrosis at days 45 and 14 for the 30% and 40% implants. Hematological analysis and clinical chemistry showed no signs of serious systemic toxicity for either implant. The 30% implants had an 80% survival at day 148, with no sign of tumor recurrence. Gamma sterilization and 12-month storage had no impact on the integrity of the 30% implants. This study demonstrates that the 30% implants are a promising novel treatment for glioblastoma that could be quickly translated into the clinic.
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Affiliation(s)
- Dina Abdelnabi
- School of Pharmacy, Robert Aitken Institute for Clinical Research, Institute of Clinical Sciences, College of Medical and Dental Sciences, University of Birmingham, Edgbaston, B15 2TT, UK
| | - Sarah Lastakchi
- School of Pharmacy, Robert Aitken Institute for Clinical Research, Institute of Clinical Sciences, College of Medical and Dental Sciences, University of Birmingham, Edgbaston, B15 2TT, UK
| | - Colin Watts
- Department of Neurosurgery, University Hospitals Birmingham, NHS Foundation Trust, Birmingham, UK
| | - Hannah Atkins
- Department of Pathology and Laboratory Medicine, School of Medicine, The University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599, USA
| | - Shawn Hingtgen
- Division of Molecular Pharmaceutics, UNC Eshelman School of Pharmacy, The University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599, USA
| | - Alain Valdivia
- Division of Molecular Pharmaceutics, UNC Eshelman School of Pharmacy, The University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599, USA
| | - Christopher McConville
- School of Pharmacy, Robert Aitken Institute for Clinical Research, Institute of Clinical Sciences, College of Medical and Dental Sciences, University of Birmingham, Edgbaston, B15 2TT, UK.
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Avendaño-Godoy J, Poblete MG, Ramos RG, Gómez-Gaete C. Evaluation of the Effects of Gamma Radiation Sterilization on Rhein-Loaded Biodegradable Microparticles for the Treatment of Osteoarthritis. J Pharm Sci 2023; 112:837-843. [PMID: 36347357 DOI: 10.1016/j.xphs.2022.11.003] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2022] [Revised: 11/02/2022] [Accepted: 11/02/2022] [Indexed: 11/06/2022]
Abstract
In previous work, we reported on the design of biodegradable rhein-loaded PLGA microparticles for the treatment of osteoarthritis. Considering that a formulation designed for intra-articular administration must meet sterility requirements to guarantee its safety, in this study the effect of gamma radiation sterilization on these microparticles was evaluated. The size, morphology, and surface characteristics of the microparticles and the encapsulation efficiency of rhein were not affected by the sterilization process. Although DSC and PXRD analyses suggested otherwise, rhein release profiles were not altered by gamma radiation. The release of rhein from the microparticles was fitted to a Gompertz model. In conclusion, the results of this study suggest that gamma radiation is a suitable method for the sterilization of rhein-loaded PLGA microparticles to enable their intra-articular administration in order to provide a therapeutic solution to patients suffering from chronic joint diseases.
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Affiliation(s)
- Javier Avendaño-Godoy
- Departamento de Farmacia, Facultad de Farmacia, Universidad de Concepción, Concepción, Chile
| | - Maria Gabriela Poblete
- Departamento de Farmacia, Facultad de Farmacia, Universidad de Concepción, Concepción, Chile
| | - Ricardo Godoy Ramos
- Departamento de Farmacia, Facultad de Farmacia, Universidad de Concepción, Concepción, Chile
| | - Carolina Gómez-Gaete
- Departamento de Farmacia, Facultad de Farmacia, Universidad de Concepción, Concepción, Chile.
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Fleitas-Salazar N, Lamazares E, Pedroso-Santana S, Kappes T, Pérez-Alonso A, Hidalgo Á, Altamirano C, Sánchez O, Fernández K, Toledo JR. Long-term release of bioactive interferon-alpha from PLGA-chitosan microparticles: in vitro and in vivo studies. BIOMATERIALS ADVANCES 2022; 143:213167. [PMID: 36356469 DOI: 10.1016/j.bioadv.2022.213167] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/16/2022] [Revised: 08/12/2022] [Accepted: 10/18/2022] [Indexed: 06/16/2023]
Abstract
Effective cytokine treatments often require high- and multiple-dose due to the short half-life of these molecules. Here, porcine interferon-alpha (IFNα) is encapsulated in PLGA-chitosan microparticles (IFNα-MPs) to accomplish both slow drug release and drug protection from degradation. A procedure that combines emulsion and spray-drying techniques yielded almost spherical microspheres with an average diameter of 3.00 ± 1.50 μm. SEM, Microtrac, and Z-potential analyses of three IFNα-MP batches showed similar results, indicating the process is reproducible. These studies supported molecular evidence obtained in FTIR analysis, which indicated a compact structure of IFNα-MPs. Consistently, IFNα release kinetics assessed in vitro followed a zero-order behavior typical of sustained release from a polymeric matrix. This study showed that IFNα-MPs released bioactive molecules for at least 15 days, achieving IFNα protection. In addition, pigs treated with IFNα-MPs exhibited overexpression of IFNα-stimulated genes 16 days after treatment. Instead, the expression levels of these genes decreased after day 4th in pigs treated with non-encapsulated IFNα. In vitro and in vivo experiments demonstrated that the formulation improved the prophylactic and therapeutic potential of IFNα, accomplishing molecule protection and long-term release for at least two weeks. The procedure used to obtain IFNα-MPs is reproducible, scalable, and suitable for encapsulating other drugs.
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Affiliation(s)
- Noralvis Fleitas-Salazar
- Biotecnology and Biopharmaceuticals Laboratory, Departamento de Fisiopatología, Facultad de Ciencias Biológicas, Universidad de Concepción, Barrio Universitario s/n, Concepción CP. 4030000, Chile
| | - Emilio Lamazares
- Biotecnology and Biopharmaceuticals Laboratory, Departamento de Fisiopatología, Facultad de Ciencias Biológicas, Universidad de Concepción, Barrio Universitario s/n, Concepción CP. 4030000, Chile
| | - Seidy Pedroso-Santana
- Biotecnology and Biopharmaceuticals Laboratory, Departamento de Fisiopatología, Facultad de Ciencias Biológicas, Universidad de Concepción, Barrio Universitario s/n, Concepción CP. 4030000, Chile
| | - Tomás Kappes
- Laboratory of Biomaterials, Departamento de Ingeniería Química, Facultad de Ingeniería, Universidad de Concepción, Barrio Universitario s/n, Concepción CP. 4030000, Chile
| | - Alain Pérez-Alonso
- Departamento de Electrónica e Informática, Universidad Técnica Federico Santa María, Concepción CP. 4030000, Chile
| | - Ángela Hidalgo
- Biotecnology and Biopharmaceuticals Laboratory, Departamento de Fisiopatología, Facultad de Ciencias Biológicas, Universidad de Concepción, Barrio Universitario s/n, Concepción CP. 4030000, Chile
| | - Claudia Altamirano
- Laboratorio de Cultivos Celulares, Escuela de Ingeniería Bioquímica, Pontificia Universidad Católica de Valparaíso, 2362803 Valparaíso, Chile
| | - Oliberto Sánchez
- Recombinant Biopharmaceuticals Laboratory, Departamento de Farmacología, Facultad de Ciencias Biológicas, Universidad de Concepción, Barrio Universitario s/n, Concepción CP. 4030000, Chile
| | - Katherina Fernández
- Laboratory of Biomaterials, Departamento de Ingeniería Química, Facultad de Ingeniería, Universidad de Concepción, Barrio Universitario s/n, Concepción CP. 4030000, Chile
| | - Jorge R Toledo
- Biotecnology and Biopharmaceuticals Laboratory, Departamento de Fisiopatología, Facultad de Ciencias Biológicas, Universidad de Concepción, Barrio Universitario s/n, Concepción CP. 4030000, Chile.
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Jacobs GP. Irradiation of pharmaceuticals: A literature review. Radiat Phys Chem Oxf Engl 1993 2022. [DOI: 10.1016/j.radphyschem.2021.109795] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Barbosa-Alfaro D, Andrés-Guerrero V, Fernandez-Bueno I, García-Gutiérrez MT, Gil-Alegre E, Molina-Martínez IT, Pastor-Jimeno JC, Herrero-Vanrell R, Bravo-Osuna I. Dexamethasone PLGA Microspheres for Sub-Tenon Administration: Influence of Sterilization and Tolerance Studies. Pharmaceutics 2021; 13:pharmaceutics13020228. [PMID: 33562155 PMCID: PMC7915986 DOI: 10.3390/pharmaceutics13020228] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2020] [Revised: 01/25/2021] [Accepted: 02/02/2021] [Indexed: 11/30/2022] Open
Abstract
Many diseases affecting the posterior segment of the eye require repeated intravitreal injections with corticosteroids in chronic treatments. The periocular administration is a less invasive route attracting considerable attention for long-term therapies. In the present work, dexamethasone-loaded poly(lactic-co-glycolic) acid (PLGA) microspheres (Dx-MS) were prepared using the oil-in-water (O/W) emulsion solvent evaporation technique. MS were characterized in terms of mean particle size and particle size distribution, external morphology, polymer integrity, drug content, and in vitro release profiles. MS were sterilized by gamma irradiation (25 kGy), and dexamethasone release profiles from sterilized and non-sterilized microspheres were compared by means of the similarity factor (f2). The mechanism of drug release before and after irradiation exposure of Dx-MS was identified using appropriate mathematical models. Dexamethasone release was sustained in vitro for 9 weeks. The evaluation of the in vivo tolerance was carried out in rabbit eyes, which received a sub-Tenon injection of 5 mg of sterilized Dx-MS (20–53 µm size containing 165.6 ± 3.6 µg Dx/mg MS) equivalent to 828 µg of Dx. No detectable increase in intraocular pressure was reported, and clinical and histological analysis of the ocular tissues showed no adverse events up to 6 weeks after the administration. According to the data presented in this work, the sub-Tenon administration of Dx-MS could be a promising alternative to successive intravitreal injections for the treatment of chronic diseases of the back of the eye.
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Affiliation(s)
- Deyanira Barbosa-Alfaro
- Innovation, Therapy and Pharmaceutical Development in Ophthalmology (InnOftal) Research Group, UCM 920415, Complutense University of Madrid, 28040 Madrid, Spain; (D.B.-A.); (V.A.-G.); (E.G.-A.); (I.T.M.-M.); (I.B.-O.)
- Departamento de Farmacia Galénica y Tecnología Alimentaria, Facultad de Farmacia, Universidad Complutense de Madrid (UCM), IdISSC, 28040 Madrid, Spain
| | - Vanessa Andrés-Guerrero
- Innovation, Therapy and Pharmaceutical Development in Ophthalmology (InnOftal) Research Group, UCM 920415, Complutense University of Madrid, 28040 Madrid, Spain; (D.B.-A.); (V.A.-G.); (E.G.-A.); (I.T.M.-M.); (I.B.-O.)
- Departamento de Farmacia Galénica y Tecnología Alimentaria, Facultad de Farmacia, Universidad Complutense de Madrid (UCM), IdISSC, 28040 Madrid, Spain
- Thematic Research Network in Ophthalmology (Oftared) Carlos III National Institute of Health, 28040 Madrid, Spain; (I.F.-B.); (J.C.P.-J.)
| | - Ivan Fernandez-Bueno
- Thematic Research Network in Ophthalmology (Oftared) Carlos III National Institute of Health, 28040 Madrid, Spain; (I.F.-B.); (J.C.P.-J.)
- Instituto Universitario de Oftalmobiología Aplicada (IOBA), Universidad de Valladolid, 47011 Valladolid, Spain;
| | | | - Esther Gil-Alegre
- Innovation, Therapy and Pharmaceutical Development in Ophthalmology (InnOftal) Research Group, UCM 920415, Complutense University of Madrid, 28040 Madrid, Spain; (D.B.-A.); (V.A.-G.); (E.G.-A.); (I.T.M.-M.); (I.B.-O.)
| | - Irene Teresa Molina-Martínez
- Innovation, Therapy and Pharmaceutical Development in Ophthalmology (InnOftal) Research Group, UCM 920415, Complutense University of Madrid, 28040 Madrid, Spain; (D.B.-A.); (V.A.-G.); (E.G.-A.); (I.T.M.-M.); (I.B.-O.)
- Departamento de Farmacia Galénica y Tecnología Alimentaria, Facultad de Farmacia, Universidad Complutense de Madrid (UCM), IdISSC, 28040 Madrid, Spain
- Thematic Research Network in Ophthalmology (Oftared) Carlos III National Institute of Health, 28040 Madrid, Spain; (I.F.-B.); (J.C.P.-J.)
| | - José Carlos Pastor-Jimeno
- Thematic Research Network in Ophthalmology (Oftared) Carlos III National Institute of Health, 28040 Madrid, Spain; (I.F.-B.); (J.C.P.-J.)
- Instituto Universitario de Oftalmobiología Aplicada (IOBA), Universidad de Valladolid, 47011 Valladolid, Spain;
- Department of Ophthalmology, Hospital Clínico Universitario of Valladolid, 47003 Valladolid, Spain
| | - Rocío Herrero-Vanrell
- Innovation, Therapy and Pharmaceutical Development in Ophthalmology (InnOftal) Research Group, UCM 920415, Complutense University of Madrid, 28040 Madrid, Spain; (D.B.-A.); (V.A.-G.); (E.G.-A.); (I.T.M.-M.); (I.B.-O.)
- Departamento de Farmacia Galénica y Tecnología Alimentaria, Facultad de Farmacia, Universidad Complutense de Madrid (UCM), IdISSC, 28040 Madrid, Spain
- Thematic Research Network in Ophthalmology (Oftared) Carlos III National Institute of Health, 28040 Madrid, Spain; (I.F.-B.); (J.C.P.-J.)
- Correspondence:
| | - Irene Bravo-Osuna
- Innovation, Therapy and Pharmaceutical Development in Ophthalmology (InnOftal) Research Group, UCM 920415, Complutense University of Madrid, 28040 Madrid, Spain; (D.B.-A.); (V.A.-G.); (E.G.-A.); (I.T.M.-M.); (I.B.-O.)
- Departamento de Farmacia Galénica y Tecnología Alimentaria, Facultad de Farmacia, Universidad Complutense de Madrid (UCM), IdISSC, 28040 Madrid, Spain
- Thematic Research Network in Ophthalmology (Oftared) Carlos III National Institute of Health, 28040 Madrid, Spain; (I.F.-B.); (J.C.P.-J.)
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Advances in controlled release hormonal technologies for contraception: A review of existing devices, underlying mechanisms, and future directions. J Control Release 2021; 330:797-811. [DOI: 10.1016/j.jconrel.2020.12.044] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2020] [Revised: 12/21/2020] [Accepted: 12/23/2020] [Indexed: 12/17/2022]
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Shim H, Sah H. Qualification of Non-Halogenated Organic Solvents Applied to Microsphere Manufacturing Process. Pharmaceutics 2020; 12:pharmaceutics12050425. [PMID: 32384751 PMCID: PMC7285046 DOI: 10.3390/pharmaceutics12050425] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2020] [Revised: 05/05/2020] [Accepted: 05/05/2020] [Indexed: 11/16/2022] Open
Abstract
As a non-halogenated dispersed solvent, ethyl acetate has been most commonly used for the manufacturing of poly-d,l-lactide-co-glycolide (PLGA) microspheres. However, ethyl acetate-based microencapsulation processes face several limitations. This study was aimed at proposing ethyl formate as an alternative. Evaluated in this study was the solvent qualification of ethyl formate and ethyl acetate for microencapsulation of a hydrophobic drug into PLGA microspheres. An oil-in-water emulsion solvent extraction technique was developed to load progesterone into PLGA microspheres. Briefly, right after emulsion droplets were temporarily stabilized, they were subject to primary solvent extraction. Appearing semisolid, embryonic microspheres were completely hardened through subsequent secondary solvent extraction. Changes in process parameters of the preparative technique made it possible to manipulate the properties of emulsion droplets, progesterone behavior, and microsphere quality. Despite the two solvents showing comparable Hansen solubility parameter distances toward PLGA, ethyl formate surpassed ethyl acetate in relation to volatility and water miscibility. These features served as advantages in the microsphere manufacturing process, helping produce PLGA microspheres with better quality in terms of drug crystallization, drug encapsulation efficiency, microsphere size homogeneity, and residual solvent content. The present ethyl formate-based preparative technique could be an attractive method of choice for the production of drug-loaded PLGA microspheres.
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Effect on in-vitro release of individual and dual contraceptive drug loading from gelatin electrospun fibers. J Drug Deliv Sci Technol 2019. [DOI: 10.1016/j.jddst.2019.03.026] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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Mircioiu C, Voicu V, Anuta V, Tudose A, Celia C, Paolino D, Fresta M, Sandulovici R, Mircioiu I. Mathematical Modeling of Release Kinetics from Supramolecular Drug Delivery Systems. Pharmaceutics 2019; 11:E140. [PMID: 30901930 PMCID: PMC6471682 DOI: 10.3390/pharmaceutics11030140] [Citation(s) in RCA: 225] [Impact Index Per Article: 45.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2019] [Revised: 03/07/2019] [Accepted: 03/18/2019] [Indexed: 12/16/2022] Open
Abstract
Embedding of active substances in supramolecular systems has as the main goal to ensure the controlled release of the active ingredients. Whatever the final architecture or entrapment mechanism, modeling of release is challenging due to the moving boundary conditions and complex initial conditions. Despite huge diversity of formulations, diffusion phenomena are involved in practically all release processes. The approach in this paper starts, therefore, from mathematical methods for solving the diffusion equation in initial and boundary conditions, which are further connected with phenomenological conditions, simplified and idealized in order to lead to problems which can be analytically solved. Consequently, the release models are classified starting from the geometry of diffusion domain, initial conditions, and conditions on frontiers. Taking into account that practically all solutions of the models use the separation of variables method and integral transformation method, two specific applications of these methods are included. This paper suggests that "good modeling practice" of release kinetics consists essentially of identifying the most appropriate mathematical conditions corresponding to implied physicochemical phenomena. However, in most of the cases, models can be written but analytical solutions for these models cannot be obtained. Consequently, empiric models remain the first choice, and they receive an important place in the review.
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Affiliation(s)
- Constantin Mircioiu
- Department of Applied Mathematics and Biostatistics, Faculty of Pharmacy, "Carol Davila" University of Medicine and Pharmacy, 020956 Bucharest, Romania.
| | - Victor Voicu
- Department of Clinical Pharmacology, Toxicology and Psychopharmacology, Faculty of Medicine, "Carol Davila" University of Medicine and Pharmacy, 020021 Bucharest, Romania.
| | - Valentina Anuta
- Department of Physical and Colloidal Chemistry, Faculty of Pharmacy, "Carol Davila" University of Medicine and Pharmacy, 020956 Bucharest, Romania.
| | - Andra Tudose
- Department of Applied Mathematics and Biostatistics, Faculty of Pharmacy, "Carol Davila" University of Medicine and Pharmacy, 020956 Bucharest, Romania.
| | - Christian Celia
- Department of Pharmacy, G. D'Annunzio University of Chieti⁻Pescara, 66100 Chieti, Italy.
| | - Donatella Paolino
- Department of Clinical and Experimental Medicine, "Magna Græcia" University of Catanzaro, Germaneto - Catanzaro (CZ) 88100, Italy.
| | - Massimo Fresta
- Department of Health Sciences, School of Pharmacy, "Magna Græcia" University of Catanzaro, Germaneto - Catanzaro (CZ) 88100, Italy.
| | - Roxana Sandulovici
- Department of Applied Mathematics and Biostatistics, Titu Maiorescu University, 004051 Bucharest, Romania.
| | - Ion Mircioiu
- Department of Biopharmacy and Pharmacokinetics, Titu Maiorescu University, 004051 Bucharest, Romania.
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van Beers MM, Slooten C, Meulenaar J, Sediq AS, Verrijk R, Jiskoot W. Micro-Flow Imaging as a quantitative tool to assess size and agglomeration of PLGA microparticles. Eur J Pharm Biopharm 2017; 117:91-104. [DOI: 10.1016/j.ejpb.2017.04.002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2017] [Accepted: 04/05/2017] [Indexed: 01/03/2023]
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11
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Halpern V, Stalter RM, Owen DH, Dorflinger LJ, Lendvay A, Rademacher KH. Towards the development of a longer-acting injectable contraceptive: past research and current trends. Contraception 2015; 92:3-9. [DOI: 10.1016/j.contraception.2015.02.014] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2015] [Revised: 02/10/2015] [Accepted: 02/25/2015] [Indexed: 10/23/2022]
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12
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Enhanced gastric tolerability and improved anti-obesity effect of capsaicinoids-loaded PCL microparticles. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2014; 40:345-56. [DOI: 10.1016/j.msec.2014.03.049] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/23/2013] [Revised: 03/10/2014] [Accepted: 03/21/2014] [Indexed: 11/18/2022]
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13
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Checa-Casalengua P, Jiang C, Bravo-Osuna I, Tucker BA, Molina-Martínez IT, Young MJ, Herrero-Vanrell R. Preservation of biological activity of glial cell line-derived neurotrophic factor (GDNF) after microencapsulation and sterilization by gamma irradiation. Int J Pharm 2012; 436:545-54. [PMID: 22828071 DOI: 10.1016/j.ijpharm.2012.07.019] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2012] [Revised: 07/10/2012] [Accepted: 07/12/2012] [Indexed: 11/25/2022]
Abstract
A main issue in controlled delivery of biotechnological products from injectable biodegradable microspheres is to preserve their integrity and functional activity after the microencapsulation process and final sterilization. The present experimental work tested different technological approaches to maintain the biological activity of an encapsulated biotechnological product within PLGA [poly (lactic-co-glycolic acid)] microspheres (MS) after their sterilization by gamma irradiation. GDNF (glial cell line-derived neurotrophic factor), useful in the treatment of several neurodegenerative diseases, was chosen as a labile model protein. In the particular case of optic nerve degeneration, GDNF has been demonstrated to improve the damaged retinal ganglion cells (RGC) survival. GDNF was encapsulated in its molecular state by the water-in-oil-in-water (W/O/W) technique or as solid according to the solid-in-oil-in-water (S/O/W) method. Based on the S/O/W technique, GDNF was included in the PLGA microspheres alone (S/O/W 1) or in combination with an antioxidant (vitamin E, Vit E) (S/O/W 2). Microspheres were sterilized by gamma-irradiation (dose of 25 kGy) at room and low (-78 °C) temperatures. Functional activity of GDNF released from the different microspheres was evaluated both before and after sterilization in their potential target cells (retinal cells). Although none of the systems proposed achieved with the goal of totally retain the structural stability of the GDNF-dimer, the protein released from the S/O/W 2 microspheres was clearly the most biologically active, showing significantly less retinal cell death than that released from either W/O/W or S/O/W 1 particles, even in low amounts of the neurotrophic factor. According to the results presented in this work, the biological activity of biotechnological products after microencapsulation and sterilization can be further preserved by the inclusion of the active molecule in its solid state in combination with antioxidants and using low temperature (-78 °C) during gamma irradiation exposure.
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Affiliation(s)
- P Checa-Casalengua
- Dep. of Pharmacy and Pharmaceutical Technology, School of Pharmacy, Avd. Complutense s/n, Complutense University, Madrid 28040, Spain
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Andreas K, Zehbe R, Kazubek M, Grzeschik K, Sternberg N, Bäumler H, Schubert H, Sittinger M, Ringe J. Biodegradable insulin-loaded PLGA microspheres fabricated by three different emulsification techniques: investigation for cartilage tissue engineering. Acta Biomater 2011; 7:1485-95. [PMID: 21168535 DOI: 10.1016/j.actbio.2010.12.014] [Citation(s) in RCA: 63] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2010] [Revised: 11/17/2010] [Accepted: 12/13/2010] [Indexed: 01/02/2023]
Abstract
Growth, differentiation and migration factors facilitate the engineering of tissues but need to be administered with defined gradients over a prolonged period of time. In this study insulin as a growth factor for cartilage tissue engineering and a biodegradable PLGA delivery device were used. The aim was to investigate comparatively three different microencapsulation techniques, solid-in-oil-in-water (s/o/w), water-in-oil-in-water (w/o/w) and oil-in-oil-in-water (o/o/w), for the fabrication of insulin-loaded PLGA microspheres with regard to protein loading efficiency, release and degradation kinetics, biological activity of the released protein and phagocytosis of the microspheres. Insulin-loaded PLGA microspheres prepared by all three emulsification techniques had smooth and spherical surfaces with a negative zeta potential. The preparation technique did not affect particle degradation nor induce phagocytosis by human leukocytes. The delivery of structurally intact and biologically active insulin from the microspheres was shown using circular dichroism spectroscopy and a MCF7 cell-based proliferation assay. However, the insulin loading efficiency (w/o/w about 80%, s/o/w 60%, and o/o/w 25%) and the insulin release kinetics were influenced by the microencapsulation technique. The results demonstrate that the w/o/w microspheres are most appropriate, providing a high encapsulation efficiency and low initial burst release, and thus these were finally used for cartilage tissue engineering. Insulin released from w/o/w PLGA microspheres stimulated the formation of cartilage considerably in chondrocyte high density pellet cultures, as determined by increased secretion of proteoglycans and collagen type II. Our results should encourage further studies applying protein-loaded PLGA microspheres in combination with cell transplants or cell-free in situ tissue engineering implants to regenerate cartilage.
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Affiliation(s)
- Kristin Andreas
- Berlin-Brandenburg Center for Regenerative Therapies, Department of Rheumatology and Clinical Immunology, Charité-Universitätsmedizin Berlin, Berlin, Germany.
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