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Scalia S, Bertoni S, Dozzo A, Rimessi A, Pinton P, Passerini N, Albertini B. Glyceryl Tristearate-Based Lipid Microparticles Loaded with the Tattoo Colorant, Acid Red 87: Colorant Retention Capacity in Excised Porcine Skin. Skin Pharmacol Physiol 2021; 33:323-330. [PMID: 33494089 DOI: 10.1159/000512643] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2020] [Accepted: 10/19/2020] [Indexed: 11/19/2022]
Abstract
BACKGROUND With the increasing diffusion of tattooing, the photolability of tattoo inks has become a critical issue, as available data indicated that several tattoo colorants are unstable under sunlight, generating potentially toxic photodegradation products. Therefore, it is desirable to enhance the photostability of coloring agents contained in tattoo inks. AIMS Lipid microparticles (LMs) highly loaded with Acid Red 87 (C.I. 45380), a colorant used in tattoo inks, were evaluated for their effect on the colorant photoinstability. In addition, the capacity of the LMs to retain the incorporated C.I. 45380 colorant after their intradermal administration in excised porcine skin was investigated. METHODS LMs loaded with C.I. 45380 were prepared using glyceryl tristearate as the lipidic material and phosphatidylcholine as the surfactant. Non-encapsulated C.I. 45380 or the colorant-loaded LMs were irradiated with a solar simulator for photodecomposition studies or introduced in the excised porcine skin mounted in Franz diffusion cells for stability evaluation in the dermal tissue. RESULTS AND CONCLUSION The colorant content of the microparticles was 17.7%, and their size ranged from 25 to 170 μm. The light-induced degradation of C.I. 45380 was significantly decreased by its incorporation in the LMs from 20.2 ± 5.8% to 1.9 ± 2.1%. Moreover, after intradermal injection of free or microencapsulated C.I. 45380 in the excised pig skin, the LMs reduced by 93.7% (from 24.6 to 1.5%) the quantity of the colorant diffused and hence lost in the Franz cell receptor fluid. Hence, the LM carrier efficiently retained the entrapped C.I. 45380 following incubation in the dermal region of the isolated porcine skin, which is in favor of a long-lasting tattoo. Based on these data, the incorporation of C.I. 45380 in the LMs could represent a potentially useful strategy to reduce the photodecomposition of the tattoo colorant and its harmful interactions with the skin tissue.
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Affiliation(s)
- Santo Scalia
- Department of Life Sciences and Biotechnology, University of Ferrara, Ferrara, Italy,
| | - Serena Bertoni
- Department of Pharmacy and Biotechnology, University of Bologna, Bologna, Italy
| | | | - Alessandro Rimessi
- Department of Medical Sciences and Laboratory for Technologies of Advanced Therapies (LTTA), University of Ferrara, Ferrara, Italy
| | - Paolo Pinton
- Department of Medical Sciences and Laboratory for Technologies of Advanced Therapies (LTTA), University of Ferrara, Ferrara, Italy
| | - Nadia Passerini
- Department of Pharmacy and Biotechnology, University of Bologna, Bologna, Italy
| | - Beatrice Albertini
- Department of Pharmacy and Biotechnology, University of Bologna, Bologna, Italy
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Zeeshan F, Tabbassum M, Kesharwani P. Investigation on Secondary Structure Alterations of Protein Drugs as an Indicator of Their Biological Activity Upon Thermal Exposure. Protein J 2020; 38:551-564. [PMID: 31054037 DOI: 10.1007/s10930-019-09837-4] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Protein drugs are important therapeutic agents however; they may degrade during formulation processing. The objective of this study was to investigate the correlation between secondary structure alterations and the retentions of biological activity of protein upon the application of thermal stress. Catalase, horseradish peroxidase and α- chymotrypsin were employed as model proteins. Each protein was heated in a solid and solution state at a temperature of 70 °C for 1 h. Attenuated total reflectance Fourier transform infrared spectroscopy, size-exclusion chromatography and biological activity assay were performed. Results showed that heat-exposure of protein solids at 70 °C caused minimum changes in secondary structure and biological activity was almost retained. However, thermal exposure of protein aqueous solution induced significant changes in the secondary structure indicated by area overlap values and caused considerable reduction in the biological activity. The changes in secondary structures were found to be in full alignment with the loss of biological activity for both protein solids as well as aqueous solutions. Catalase lost entire biological activity upon heating in the solution state. In conclusion, the findings of the present study indicate a direct correlation between protein secondary structure alterations and the retention of biological activity which can be taken into account during the development and delivery of protein drugs formulations.
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Affiliation(s)
- Farrukh Zeeshan
- School of Pharmacy, International Medical University (IMU), Kuala Lumpur, Malaysia
- School of Pharmacy, University of Otago, Dunedin, New Zealand
| | - Misbah Tabbassum
- Department of Chemistry, Faculty of Science, University of Malaya (UM), Kuala Lumpur, Malaysia
| | - Prashant Kesharwani
- Department of Pharmaceutics, School of Pharmaceutical Education and Research, Jamia Hamdard, New Delhi, 110062, India.
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Tabbassum M, Zeeshan F. Effects of formulation development methods on the stability of model protein pharmaceuticals embedded in solid lipid matrices. Pharm Dev Technol 2019; 24:649-662. [DOI: 10.1080/10837450.2018.1551902] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Affiliation(s)
- Misbah Tabbassum
- Department of Chemistry, Faculty of Science, University of Malaya (UM), Kuala Lumpur, Malaysia
| | - Farrukh Zeeshan
- School of Pharmacy, University of Otago, Dunedin, New Zealand
- School of Pharmacy, International Medical University (IMU), Kuala Lumpur, Malaysia
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Vollrath M, Engert J, Winter G. New insights into process understanding of solid lipid extrusion (SLE) of extruded lipid implants for sustained protein delivery. Eur J Pharm Biopharm 2018; 130:11-21. [PMID: 29913270 DOI: 10.1016/j.ejpb.2018.06.016] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2017] [Revised: 05/23/2018] [Accepted: 06/13/2018] [Indexed: 11/24/2022]
Abstract
The aim of this work is a better understanding of solid lipid extrusion (SLE) for protein depot production using a lab-scale twin-screw (tsc)-extruder. In this context, little is known about the relationship of process parameters such as extrusion temperature, screw speed, or formulation on implant characteristics. It is difficult to attribute release characteristics to only one parameter, since the release will always be influenced by a combination of parameters. In this study, we describe the use of an online pressure measurement tool which allows to characterize pressure profiles during an extrusion run. We systematically investigated the impact of various process parameters on implant properties as well as release patterns using a monoclonal antibody (mAb). Solid lipid implants (SLIs) were produced by tsc-extrusion using the low melting triglyceride H12 and the high melting triglyceride Dynasan® D118. A mAb available in a freeze-dried matrix containing hydroxypropyl-β-cyclodextrine (HP-β-CD) was used as incorporated active pharmaceutical ingredient. Extrusion temperature (33-37 °C), screw speed (40-80 rpm) and the lipid composition (30-70% of each triglyceride) were modified. Additionally, freshly extruded SLIs were ground and extruded again as a preparation technique to optimize properties of SLIs. Using the pressure monitoring tool, four characteristic phases were defined for an extrusion run. We found that both, sufficient pressure and adequately molten material, is needed to form a suitable implant. Using the double extrusion technique, release rates could substantially be slowed down without changing formulation.
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Affiliation(s)
- Moritz Vollrath
- Department of Pharmacy, Pharmaceutical Technology and Biopharmaceutics, Ludwig-Maximilians-University, Butenandtstrasse 5-13, D-81377 Munich, Germany.
| | - Julia Engert
- Department of Pharmacy, Pharmaceutical Technology and Biopharmaceutics, Ludwig-Maximilians-University, Butenandtstrasse 5-13, D-81377 Munich, Germany
| | - Gerhard Winter
- Department of Pharmacy, Pharmaceutical Technology and Biopharmaceutics, Ludwig-Maximilians-University, Butenandtstrasse 5-13, D-81377 Munich, Germany
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5
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Zeeshan F, Tabbassum M, Jorgensen L, Medlicott NJ. Attenuated Total Reflection Fourier Transform Infrared (ATR FT-IR) Spectroscopy as an Analytical Method to Investigate the Secondary Structure of a Model Protein Embedded in Solid Lipid Matrices. APPLIED SPECTROSCOPY 2018; 72:268-279. [PMID: 29022355 DOI: 10.1177/0003702817739908] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Protein drugs may encounter conformational perturbations during the formulation processing of lipid-based solid dosage forms. In aqueous protein solutions, attenuated total reflection Fourier transform infrared (ATR FT-IR) spectroscopy can investigate these conformational changes following the subtraction of spectral interference of solvent with protein amide I bands. However, in solid dosage forms, the possible spectral contribution of lipid carriers to protein amide I band may be an obstacle to determine conformational alterations. The objective of this study was to develop an ATR FT-IR spectroscopic method for the analysis of protein secondary structure embedded in solid lipid matrices. Bovine serum albumin (BSA) was chosen as a model protein, while Precirol AT05 (glycerol palmitostearate, melting point 58 ℃) was employed as the model lipid matrix. Bovine serum albumin was incorporated into lipid using physical mixing, melting and mixing, or wet granulation mixing methods. Attenuated total reflection FT-IR spectroscopy and size exclusion chromatography (SEC) were performed for the analysis of BSA secondary structure and its dissolution in aqueous media, respectively. The results showed significant interference of Precirol ATO5 with BSA amide I band which was subtracted up to 90% w/w lipid content to analyze BSA secondary structure. In addition, ATR FT-IR spectroscopy also detected thermally denatured BSA solid alone and in the presence of lipid matrix indicating its suitability for the detection of denatured protein solids in lipid matrices. Despite being in the solid state, conformational changes occurred to BSA upon incorporation into solid lipid matrices. However, the extent of these conformational alterations was found to be dependent on the mixing method employed as indicated by area overlap calculations. For instance, the melting and mixing method imparted negligible effect on BSA secondary structure, whereas the wet granulation mixing method promoted more changes. Size exclusion chromatography analysis depicted the complete dissolution of BSA in the aqueous media employed in the wet granulation method. In conclusion, an ATR FT-IR spectroscopic method was successfully developed to investigate BSA secondary structure in solid lipid matrices following the subtraction of lipid spectral interference. The ATR FT-IR spectroscopy could further be applied to investigate the secondary structure perturbations of therapeutic proteins during their formulation development.
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Affiliation(s)
- Farrukh Zeeshan
- 1 School of Pharmacy, University of Otago, Dunedin, New Zealand
- 2 School of Pharmacy, International Medical University, Kuala Lumpur, Malaysia
| | - Misbah Tabbassum
- 3 Department of Chemistry, Faculty of Science, University of Malaya, Kuala Lumpur, Malaysia
| | - Lene Jorgensen
- 4 Department of Pharmacy, Faculty of Health and Medical Sciences, University of Copenhagen, Denmark
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Zeeshan F, Tabbassum M, Jorgensen L, Medlicott NJ. Investigation on Secondary Structure Perturbations of Proteins Embedded in Solid Lipid Matrices as a Novel Indicator of their Biological Activity upon In Vitro Release. AAPS PharmSciTech 2018; 19:769-782. [PMID: 29134579 DOI: 10.1208/s12249-017-0883-1] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2017] [Accepted: 09/18/2017] [Indexed: 11/30/2022] Open
Abstract
Protein biologics are prone to conformational changes during formulation development. Limited methods are available for conformational analysis of proteins in solid state and in the presences of formulation excipients. The aim of this study was to investigate the secondary structures of proteins encased in solid lipid matrices as a novel indicator of their stability upon in vitro release. Model proteins namely catalase and lysozyme were incorporated into lipid namely Precirol® AT05 (glycerol palmitostearate, melting point 58°C) at 30% w/w loading using melting and mixing and wet granulation methods. Attenuated total reflectance (ATR-FTIR) spectroscopy, size-exclusion chromatography (SEC) and biological activity analyses were performed. The information about secondary structure was acquired using second derivative analysis of amide-I band (1600-1700 cm-1). ATR analysis demonstrated interference of lipid spectrum with protein amide-I band which was subsequently subtracted to allow the analysis of the secondary structure. ATR spectra amide-I bands showed shifts peak band positions compared to native protein for matrices prepared using wet granulation. SEC analysis gave evidence of protein aggregation for catalase which was increased using wet granulation. The biological activity of catalase was statistically different from that of control and was affected by the incorporation method and was found to be in alignment with ATR spectral changes and extent of aggregation. In conclusion, ATR spectroscopy could analyze protein secondary structure in lipid matrices provided lipid interference was minimized. The ATR spectral changes and formation of aggregates can indicate the loss in biological activity of protein released from solid lipid matrices.
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Vollrath M, Engert J, Winter G. Long-term release and stability of pharmaceutical proteins delivered from solid lipid implants. Eur J Pharm Biopharm 2017; 117:244-255. [PMID: 28442372 DOI: 10.1016/j.ejpb.2017.04.017] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2016] [Revised: 03/19/2017] [Accepted: 04/13/2017] [Indexed: 01/13/2023]
Abstract
Solid lipid implants (SLIs) prepared by twin-screw (tsc) extrusion represent a promising technology platform for the sustained release of pharmaceutical proteins. In this work, we report on two aspects, long-term release and stability of released protein. First, SLIs were produced by tsc-extrusion containing the low melting triglyceride H12 and the high melting triglyceride Dynasan D118. Two different proteins available in a freeze-dried matrix containing hydroxypropyl-β-cyclodextrine (HP-β-CD) were incorporated into the lipid matrix: a monoclonal antibody (mAb) from the IgG1 class and the fab-fragment Ranibizumab (Lucentis®). SLIs, composed of 10% protein lyophilizate and both triglycerides, were extruded at 35°C and 40rpm. Sustained release of both proteins was observed in a sustained manner for approximately 120days. Protein load per implant was increased by three different approaches resulting in a protein load of 3.00mg per implant without affecting the release profiles. The incubation medium containing the released protein was collected, concentrated and analyzed including liquid chromatography (SE-HPLC, IEX, HIC), electrophoresis (SDS-PAGE, on-chip gel electrophoresis) and FT-IR spectroscopy. The mAb showed a monomer loss of up to 7% (SE-HPLC) and IEX analysis revealed the formation of 16% acidic subspecies after 18weeks. FT-IR spectra of mAb indicated the formation of random coil structures towards the end of the release study. Ranibizumab was mainly released in its monomeric form (>95%), and approximately 5% hydrophobic subspecies were formed after 18weeks of release. FT-IR analysis revealed no changes in secondary structure. The release and stability profiles of both proteins underline the potential of SLIs as a delivery system. SLIs provide a promising platform for applications where really long-term release is needed, for example for intraocular delivery of anti-vascular endothelial growth factor (VEGF) drugs for age related macular degeneration (AMD).
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Affiliation(s)
- Moritz Vollrath
- Department of Pharmacy, Pharmaceutical Technology and Biopharmaceutics, Ludwig-Maximilians-University, Butenandtstrasse 5-13, Munich D-81377, Germany
| | - Julia Engert
- Department of Pharmacy, Pharmaceutical Technology and Biopharmaceutics, Ludwig-Maximilians-University, Butenandtstrasse 5-13, Munich D-81377, Germany
| | - Gerhard Winter
- Department of Pharmacy, Pharmaceutical Technology and Biopharmaceutics, Ludwig-Maximilians-University, Butenandtstrasse 5-13, Munich D-81377, Germany.
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8
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Floroian L, Ristoscu C, Mihailescu N, Negut I, Badea M, Ursutiu D, Chifiriuc MC, Urzica I, Dyia HM, Bleotu C, Mihailescu IN. Functionalized Antimicrobial Composite Thin Films Printing for Stainless Steel Implant Coatings. Molecules 2016; 21:molecules21060740. [PMID: 27294895 PMCID: PMC6274373 DOI: 10.3390/molecules21060740] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2016] [Revised: 06/01/2016] [Accepted: 06/02/2016] [Indexed: 01/24/2023] Open
Abstract
In this work we try to address the large interest existing nowadays in the better understanding of the interaction between microbial biofilms and metallic implants. Our aimed was to identify a new preventive strategy to control drug release, biofilm formation and contamination of medical devices with microbes. The transfer and printing of novel bioactive glass-polymer-antibiotic composites by Matrix-Assisted Pulsed Laser Evaporation into uniform thin films onto 316 L stainless steel substrates of the type used in implants are reported. The targets were prepared by freezing in liquid nitrogen mixtures containing polymer and antibiotic reinforced with bioglass powder. The cryogenic targets were submitted to multipulse evaporation by irradiation with an UV KrF* (λ = 248 nm, τFWHM ≤ 25 ns) excimer laser source. The prepared structures were analyzed by infrared spectroscopy, scanning electron microscopy, energy dispersive X-ray spectroscopy and profilometry, before and after immersion in physiological fluids. The bioactivity and the release of the antibiotic have been evaluated. We showed that the incorporated antibiotic underwent a gradually dissolution in physiological fluids thus supporting a high local treatment efficiency. Electrochemical measurements including linear sweep voltammetry and impedance spectroscopy studies were carried out to investigate the corrosion resistance of the coatings in physiological environments. The in vitro biocompatibility assay using the MG63 mammalian cell line revealed that the obtained nanostructured composite films are non-cytotoxic. The antimicrobial effect of the coatings was tested against Staphylococcus aureus and Escherichia coli strains, usually present in implant-associated infections. An anti-biofilm activity was evidenced, stronger against E. coli than the S. aureus strain. The results proved that the applied method allows for the fabrication of implantable biomaterials which shield metal ion release and possess increased biocompatibility and resistance to microbial colonization and biofilm growth.
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Affiliation(s)
- Laura Floroian
- Faculty of Electrical Engineering and Computer Science, 1 Politehnicii Str., Transilvania University of Brasov, Brasov 500024, Romania.
| | - Carmen Ristoscu
- National Institute for Laser, Plasma and Radiation Physics, P.O. Box MG-36, Magurele, Ilfov RO-77125, Romania.
| | - Natalia Mihailescu
- National Institute for Laser, Plasma and Radiation Physics, P.O. Box MG-36, Magurele, Ilfov RO-77125, Romania.
| | - Irina Negut
- National Institute for Laser, Plasma and Radiation Physics, P.O. Box MG-36, Magurele, Ilfov RO-77125, Romania.
- Faculty of Physics, University of Bucharest, Magurele, Ilfov 077125, Romania.
| | - Mihaela Badea
- Faculty of Medicine, 56 N. Balcescu Str., Transilvania University of Brasov, Brasov 500019, Romania.
| | - Doru Ursutiu
- Faculty of Electrical Engineering and Computer Science, 1 Politehnicii Str., Transilvania University of Brasov, Brasov 500024, Romania.
| | - Mariana Carmen Chifiriuc
- Faculty of Biology, Research Institute of the University of Bucharest-ICUB, University of Bucharest, Spl. Independentei 91-95, Bucharest 050095, Romania.
| | - Iuliana Urzica
- National Institute for Laser, Plasma and Radiation Physics, P.O. Box MG-36, Magurele, Ilfov RO-77125, Romania.
| | - Hussien Mohammed Dyia
- Faculty of Biology, Research Institute of the University of Bucharest-ICUB, University of Bucharest, Spl. Independentei 91-95, Bucharest 050095, Romania.
| | - Coralia Bleotu
- "Stefan S. Nicolau" Institute of Virology, 285 Mihai Bravu Avenue, Bucharest 30304, Romania.
| | - Ion N Mihailescu
- National Institute for Laser, Plasma and Radiation Physics, P.O. Box MG-36, Magurele, Ilfov RO-77125, Romania.
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9
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Hu M, Zhang Y, Xiang N, Zhong Y, Gong T, Zhang ZR, Fu Y. Long-Acting Phospholipid Gel of Exenatide for Long-Term Therapy of Type II Diabetes. Pharm Res 2016; 33:1318-26. [DOI: 10.1007/s11095-016-1873-9] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2015] [Accepted: 02/03/2016] [Indexed: 11/24/2022]
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Engert J. Implants as Sustained Release Delivery Devices for Vaccine Antigens. ADVANCES IN DELIVERY SCIENCE AND TECHNOLOGY 2015. [DOI: 10.1007/978-1-4939-1417-3_12] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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Rosiaux Y, Jannin V, Hughes S, Marchaud D. Solid lipid excipients — Matrix agents for sustained drug delivery. J Control Release 2014; 188:18-30. [DOI: 10.1016/j.jconrel.2014.06.004] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2014] [Revised: 06/02/2014] [Accepted: 06/03/2014] [Indexed: 10/25/2022]
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12
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Wu W, Chen H, Shan F, Zhou J, Sun X, Zhang L, Gong T. A novel doxorubicin-loaded in situ forming gel based high concentration of phospholipid for intratumoral drug delivery. Mol Pharm 2014; 11:3378-85. [PMID: 24735404 DOI: 10.1021/mp500019p] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
The purpose of this study was to develop a safe and effective drug delivery system for local chemotherapy. A novel injectable in-situ-forming gel system was prepared using small molecule materials, including phospholipids, medium chain triglycerides (MCTs), and ethanol. Thus, this new sustained release system was named PME (first letter of phospholipids, MCT, and ethanol). PME has a well-defined molecule structure, a high degree of safety, and better biocompatible characteristics. It was in sol state with low viscosity in vitro and turned into a solid or semisolid gel in situ after injection. When loaded with doxorubicin (Dox), PME-D (doxorubicin-loaded PME) exhibited notably antitumor efficiency in S180 sarcoma tumors bearing mice after a single intratumoral injection. In vitro, PME-D had remarkable antiproliferative efficacies against MCF-7 breast cancer cells for over 5 days. Moreover, the initial burst effect can hardly be observed from PME system, which was different from many other in-situ-forming gels. The in vivo biodistribution study showed the high Dox concentration in tumors compared with other major organs after PME-D intratumoral administration. The strong signal in tumors was retained for more than 14 days after one single injection. The high concentration of Dox in tumor and long-term retention may explain the superior therapeutic efficacy and reduced side effects. The PME-D in-situ-forming gel system is a promising drug delivery system for local chemotherapy.
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Affiliation(s)
- Wenqi Wu
- Key Laboratory of Drug Targeting and Drug Delivery Systems, Ministry of Education, Sichuan University , 29 Wangjiang Rd, Chengdu, Sichuan 610041, People's Republic of China
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Studies on the lipase-induced degradation of lipid-based drug delivery systems. Part II – Investigations on the mechanisms leading to collapse of the lipid structure. Eur J Pharm Biopharm 2013; 84:456-63. [DOI: 10.1016/j.ejpb.2012.12.023] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2012] [Revised: 12/03/2012] [Accepted: 12/21/2012] [Indexed: 11/21/2022]
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14
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Haupt M, Thommes M, Heidenreich A, Breitkreutz J. Lipid-based intravesical drug delivery systems with controlled release of trospium chloride for the urinary bladder. J Control Release 2013; 170:161-6. [PMID: 23732944 DOI: 10.1016/j.jconrel.2013.05.018] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2012] [Revised: 05/02/2013] [Accepted: 05/23/2013] [Indexed: 12/22/2022]
Abstract
The overactive bladder (OAB) is a common disease with an overactivity of the detrusor muscle in the bladder wall. Besides peroral administration of anticholinergic drugs and bladder irrigations, there is a need for a sustained release formulation in the urinary bladder. In order to realise a local long-term treatment of the overactive urinary bladder, lipidic drug delivery systems were prepared. Requirements for an intravesical application are a long-term controlled release of trospium chloride, a high drug loading and small sized drug carriers to permit an insertion through the urethra into the urinary bladder. The drug delivery systems were manufactured by using compression (mini-tablets), solid lipid extrusion (extrudates) and a melting and casting technique (mini-moulds) with different amounts of trospium chloride and glyceryl tristearate as matrix former. Drug release depended on the drug loading and the preparation method. Mini-tablets and lipidic extrudates showed a drug release over five days, whereas that from mini-moulds was negligibly small. The appearance of polymorphic transformations during processing and storage was investigated by using differential scanning calorimetry and X-ray diffraction. In contrast to mini-tablets and mini-moulds, lipidic extrudates showed no polymorphic transformations. In summary, lipids are suitable matrix formers for a highly water-soluble drug, like trospium chloride. Despite a drug loading of up to 30%, it was feasible to achieve a drug release ranging from several days up to weeks. In addition, small dosage forms with a size of only a few millimetres were realised. Therefore, an insertion and excretion through the urethra is possible and the requirements for an intravesical application are fulfilled.
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Affiliation(s)
- M Haupt
- Department of Urology, RWTH University Aachen, Pauwelsstrasse 30, 52074 Aachen, Germany.
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15
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Sax G, Winter G. Mechanistic studies on the release of lysozyme from twin-screw extruded lipid implants. J Control Release 2012; 163:187-94. [DOI: 10.1016/j.jconrel.2012.08.025] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2012] [Revised: 08/15/2012] [Accepted: 08/24/2012] [Indexed: 10/27/2022]
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16
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In-vivo biodegradation of extruded lipid implants in rabbits. J Control Release 2012; 163:195-202. [DOI: 10.1016/j.jconrel.2012.08.026] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2012] [Revised: 08/15/2012] [Accepted: 08/24/2012] [Indexed: 11/23/2022]
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17
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Release pathways of interferon α2a molecules from lipid twin screw extrudates revealed by single molecule fluorescence microscopy. J Control Release 2012; 162:295-302. [DOI: 10.1016/j.jconrel.2012.07.014] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2012] [Revised: 07/04/2012] [Accepted: 07/10/2012] [Indexed: 11/23/2022]
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18
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Wöhl-Bruhn S, Badar M, Bertz A, Tiersch B, Koetz J, Menzel H, Mueller PP, Bunjes H. Comparison of in vitro and in vivo protein release from hydrogel systems. J Control Release 2012; 162:127-33. [DOI: 10.1016/j.jconrel.2012.05.049] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2012] [Revised: 05/25/2012] [Accepted: 05/30/2012] [Indexed: 02/05/2023]
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Kreye F, Hamm G, Karrout Y, Legouffe R, Bonnel D, Siepmann F, Siepmann J. MALDI-TOF MS imaging of controlled release implants. J Control Release 2012; 161:98-108. [PMID: 22551600 DOI: 10.1016/j.jconrel.2012.04.017] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2011] [Revised: 04/07/2012] [Accepted: 04/10/2012] [Indexed: 11/27/2022]
Abstract
MALDI-TOF MS (matrix-assisted laser desorption/ionization time-of-flight mass spectrometry) imaging is used to characterize novel lipid implants allowing for controlled drug delivery. Importantly, this innovative technique provides crucial information on the inner structure of the implants before and after exposure to the release medium and does not require the addition of marker substances. Implants were prepared by extrusion at room temperature. Thus, in contrast to hot-melt extruded systems, the risks of drug inactivation and solid state transformations of the lipid matrix former are reduced. Hydrogenated/hardened soybean oil and glyceryl tristearate were studied as lipids and propranolol hydrochloride and theophylline as drugs, exhibiting significantly different solubility in water. The implants were also characterized by optical microscopy, differential scanning calorimetry, water uptake and lipid erosion studies, mathematical modeling as well as in vitro drug release measurements. Importantly, broad spectra of drug release patterns with release periods ranging from a few days up to several months could easily be provided when varying the initial drug content and type of lipid, irrespective of the type of drug. The diameter of the implants can be as small as 1mm, facilitating injection. MALDI-TOF MS imaging revealed homogeneous macroscopic drug distributions within the systems, but steep drug concentration gradients in radial and axial direction at the lower micrometer level, indicating drug- and lipid-rich domains. As the implants do not significantly swell, local irritation upon administration due to mechanical stress can be expected to be limited. Good agreement between experimentally measured and theoretically calculated drug release kinetics revealed that diffusional mass transport plays a major role for the control of drug release from this type of advanced drug delivery systems.
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Affiliation(s)
- F Kreye
- College of Pharmacy, University of Lille, 3 Rue du Prof. Laguesse, 59006 Lille, France
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Mathematical modeling of drug release from lipid dosage forms. Int J Pharm 2011; 418:42-53. [DOI: 10.1016/j.ijpharm.2011.07.015] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2011] [Revised: 07/11/2011] [Accepted: 07/13/2011] [Indexed: 11/22/2022]
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21
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Kreye F, Siepmann F, Zimmer A, Willart J, Descamps M, Siepmann J. Cast Lipid Implants for Controlled Drug Delivery: Importance of the Tempering Conditions. J Pharm Sci 2011; 100:3471-3481. [DOI: 10.1002/jps.22574] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2010] [Revised: 02/04/2011] [Accepted: 03/22/2011] [Indexed: 11/12/2022]
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22
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Kreye F, Siepmann F, Zimmer A, Willart J, Descamps M, Siepmann J. Controlled release implants based on cast lipid blends. Eur J Pharm Sci 2011; 43:78-83. [DOI: 10.1016/j.ejps.2011.03.013] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2010] [Revised: 03/27/2011] [Accepted: 03/28/2011] [Indexed: 11/17/2022]
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23
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Drug release mechanisms of compressed lipid implants. Int J Pharm 2011; 404:27-35. [DOI: 10.1016/j.ijpharm.2010.10.048] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2010] [Revised: 10/25/2010] [Accepted: 10/26/2010] [Indexed: 11/24/2022]
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24
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Tong Y, Chen Y, Pan J, Huang L, Wang R. Effect of Dextran Gel on Preparation of Nano-liposomes Loaded with Ginkgolide. B KOREAN CHEM SOC 2010. [DOI: 10.5012/bkcs.2010.31.9.2542] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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25
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Studies on the lipase induced degradation of lipid based drug delivery systems. J Control Release 2009; 140:27-33. [DOI: 10.1016/j.jconrel.2009.07.008] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2009] [Revised: 06/28/2009] [Accepted: 07/06/2009] [Indexed: 11/18/2022]
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