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Lefol L, Bawuah P, Zeitler J, Verin J, Danede F, Willart J, Siepmann F, Siepmann J. Drug release from PLGA microparticles can be slowed down by a surrounding hydrogel. Int J Pharm X 2023; 6:100220. [PMID: 38146325 PMCID: PMC10749250 DOI: 10.1016/j.ijpx.2023.100220] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2023] [Revised: 11/23/2023] [Accepted: 11/25/2023] [Indexed: 12/27/2023] Open
Abstract
This study aimed to evaluate and better understand the potential impact that a layer of surrounding hydrogel (mimicking living tissue) can have on the drug release from PLGA microparticles. Ibuprofen-loaded microparticles were prepared with an emulsion solvent extraction/evaporation method. The drug loading was about 48%. The surface of the microparticles appeared initially smooth and non-porous. In contrast, the internal microstructure of the particles exhibited a continuous network of tiny pores. Ibuprofen release from single microparticles was measured into agarose gels and well-agitated phosphate buffer pH 7.4. Optical microscopy, scanning electron microscopy, differential scanning calorimetry, X-ray powder diffraction, and X-ray μCT imaging were used to characterize the microparticles before and after exposure to the release media. Importantly, ibuprofen release was much slower in the presence of a surrounding agarose gel, e.g., the complete release took two weeks vs. a few days in well agitated phosphate buffer. This can probably be attributed to the fact that the hydrogel sterically hinders substantial system swelling and, thus, slows down the related increase in drug mobility. In addition, in this particular case, the convective flow in agitated bulk fluid likely damages the thin PLGA layer at the microparticles' surface, giving the outer aqueous phase more rapid access to the inner continuous pore network: Upon contact with water, the drug dissolves and rapidly diffuses out through a continuous network of water-filled channels. Without direct surface access, most of the drug "has to wait" for the onset of substantial system swelling to be released.
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Affiliation(s)
- L.A. Lefol
- Univ. Lille, Inserm, CHU Lille, U1008, Lille F-59000, France
| | - P. Bawuah
- Univ. Cambridge, Department of Chemical Engineering and Biotechnology, Cambridge CB3 0AS, UK
| | - J.A. Zeitler
- Univ. Cambridge, Department of Chemical Engineering and Biotechnology, Cambridge CB3 0AS, UK
| | - J. Verin
- Univ. Lille, Inserm, CHU Lille, U1008, Lille F-59000, France
| | - F. Danede
- Univ. Lille, USTL UMET UMR CNRS 8207, Villeneuve d'Ascq F-59650, France
| | - J.F. Willart
- Univ. Lille, USTL UMET UMR CNRS 8207, Villeneuve d'Ascq F-59650, France
| | - F. Siepmann
- Univ. Lille, Inserm, CHU Lille, U1008, Lille F-59000, France
| | - J. Siepmann
- Univ. Lille, Inserm, CHU Lille, U1008, Lille F-59000, France
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Rongthong T, Qnouch A, Gehrke MM, Danede F, Willart J, Oliveira P, Paccou L, Tourrel G, Stahl P, Verin J, Toulemonde P, Vincent C, Siepmann F, Siepmann J. Long term behavior of dexamethasone-loaded cochlear implants: In vitro & in vivo. Int J Pharm X 2022; 4:100141. [DOI: 10.1016/j.ijpx.2022.100141] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2022] [Revised: 11/17/2022] [Accepted: 11/19/2022] [Indexed: 11/23/2022] Open
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Bassand C, Benabed L, Verin J, Danede F, Lefol L, Willart J, Siepmann F, Siepmann J. Hot melt extruded PLGA implants loaded with ibuprofen: How heat exposure alters the physical drug state. J Drug Deliv Sci Technol 2022. [DOI: 10.1016/j.jddst.2022.103432] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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Qnouch A, Solarczyk V, Verin J, Tourrel G, Stahl P, Danede F, Willart JF, Lemesre PE, Vincent C, Siepmann J, Siepmann F. Dexamethasone-loaded cochlear implants: How to provide a desired "burst release". Int J Pharm X 2021; 3:100088. [PMID: 34553137 PMCID: PMC8441626 DOI: 10.1016/j.ijpx.2021.100088] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/23/2021] [Revised: 06/03/2021] [Accepted: 06/06/2021] [Indexed: 12/20/2022]
Abstract
Cochlear implants containing iridium platinum electrodes are used to transmit electrical signals into the inner ear of patients suffering from severe or profound deafness without valuable benefit from conventional hearing aids. However, their placement is invasive and can cause trauma as well as local inflammation, harming remaining hair cells or other inner ear cells. As foreign bodies, the implants also induce fibrosis, resulting in a less efficient conduction of the electrical signals and, thus, potentially decreased system performance. To overcome these obstacles, dexamethasone has recently been embedded in this type of implants: into the silicone matrices separating the metal electrodes (to avoid short circuits). It has been shown that the resulting drug release can be controlled over several years. Importantly, the dexamethasone does not only act against the immediate consequences of trauma, inflammation and fibrosis, it can also be expected to be beneficial for remaining hair cells in the long term. However, the reported amounts of drug released at “early” time points (during the first days/weeks) are relatively low and the in vivo efficacy in animal models was reported to be non-optimal. The aim of this study was to increase the initial “burst release” from the implants, adding a freely water-soluble salt of a phosphate ester of dexamethasone. The idea was to facilitate water penetration into the highly hydrophobic system and, thus, to promote drug dissolution and diffusion. This approach was efficient: Adding up to 10% dexamethasone sodium phosphate to the silicone matrices substantially increased the resulting drug release rate at early time points. This can be expected to improve drug action and implant functionality. But at elevated dexamethasone sodium phosphate loadings device swelling became important. Since the cochlea is a tiny and sensitive organ, a potential increase in implant dimensions over time must be limited. Hence, a balance has to be found between drug release and implant swelling.
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Affiliation(s)
- A Qnouch
- Univ. Lille, Inserm, CHU Lille, U1008, F-59000 Lille, France
| | - V Solarczyk
- Univ. Lille, Inserm, CHU Lille, U1008, F-59000 Lille, France
| | - J Verin
- Univ. Lille, Inserm, CHU Lille, U1008, F-59000 Lille, France
| | - G Tourrel
- Oticon Medical, R&D, 06224 Vallauris, France
| | - P Stahl
- Oticon Medical, R&D, 06224 Vallauris, France
| | - F Danede
- Univ. Lille, UMR CNRS 8207, UMET, F-59655 Villeneuve d'Ascq, France
| | - J F Willart
- Univ. Lille, UMR CNRS 8207, UMET, F-59655 Villeneuve d'Ascq, France
| | - P E Lemesre
- Univ. Lille, Inserm, CHU Lille, U1008, F-59000 Lille, France
| | - C Vincent
- Univ. Lille, Inserm, CHU Lille, U1008, F-59000 Lille, France
| | - J Siepmann
- Univ. Lille, Inserm, CHU Lille, U1008, F-59000 Lille, France
| | - F Siepmann
- Univ. Lille, Inserm, CHU Lille, U1008, F-59000 Lille, France
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Cantin O, Siepmann F, Willart J, Danede F, Siepmann J, Karrout Y. PEO hot melt extrudates for controlled drug delivery: Importance of the type of drug and loading. J Drug Deliv Sci Technol 2021. [DOI: 10.1016/j.jddst.2020.102238] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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Benzine Y, Siepmann F, Neut C, Danede F, Willart J, Siepmann J, Karrout Y. Hot melt extruded polysaccharide blends for controlled drug delivery. J Drug Deliv Sci Technol 2019. [DOI: 10.1016/j.jddst.2019.101317] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Tamani F, Bassand C, Hamoudi MC, Danede F, Willart JF, Siepmann F, Siepmann J. Mechanistic explanation of the (up to) 3 release phases of PLGA microparticles: Diprophylline dispersions. Int J Pharm 2019; 572:118819. [PMID: 31726196 DOI: 10.1016/j.ijpharm.2019.118819] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2019] [Revised: 10/17/2019] [Accepted: 10/21/2019] [Indexed: 01/29/2023]
Abstract
The aim of this study was to better understand the root causes for the (up to) 3 drug release phases observed with poly (lactic-co-glycolic acid) (PLGA) microparticles containing diprophylline particles: The 1st release phase ("burst release"), 2nd release phase (with an "about constant release rate") and 3rd release phase (which is again rapid and leads to complete drug exhaust). The behavior of single microparticles was monitored upon exposure to phosphate buffer pH 7.4, in particular with respect to their drug release and swelling behaviors. Diprophylline-loaded PLGA microparticles were prepared with a solid-in-oil-in-water solvent extraction/evaporation method. Tiny drug crystals were rather homogeneously distributed throughout the polymer matrix after manufacturing. Batches with "small" (63 µm), "medium-sized" (113 µm) and "large" (296 µm) microparticles with a practical drug loading of 5-7% were prepared. Importantly, each microparticle releases the drug "in its own way", depending on the exact distribution of the tiny drug crystals within the system. During the burst release, drug crystals with direct surface access rapidly dissolve. During the 2nd release phase tiny drug crystals (often) located in surface near regions which undergo swelling, are likely released. During the 3rd release phase, the entire microparticle undergoes substantial swelling. This results in high quantities of water present throughout the system, which becomes "gel-like". Consequently, the drug crystals dissolve, and the dissolved drug molecules rather rapidly diffuse through the highly swollen polymer gel.
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Affiliation(s)
- F Tamani
- Univ. Lille, Inserm, CHU Lille, U1008, F-59000 Lille, France
| | - C Bassand
- Univ. Lille, Inserm, CHU Lille, U1008, F-59000 Lille, France
| | - M C Hamoudi
- Univ. Lille, Inserm, CHU Lille, U1008, F-59000 Lille, France
| | - F Danede
- Univ. Lille, USTL UMET UMR CNRS 8207, F-59650 Villeneuve d'Ascq, France
| | - J F Willart
- Univ. Lille, USTL UMET UMR CNRS 8207, F-59650 Villeneuve d'Ascq, France
| | - F Siepmann
- Univ. Lille, Inserm, CHU Lille, U1008, F-59000 Lille, France
| | - J Siepmann
- Univ. Lille, Inserm, CHU Lille, U1008, F-59000 Lille, France.
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Hamoudi-Ben Yelles M, Tran Tan V, Danede F, Willart J, Siepmann J. PLGA implants: How Poloxamer/PEO addition slows down or accelerates polymer degradation and drug release. J Control Release 2017; 253:19-29. [DOI: 10.1016/j.jconrel.2017.03.009] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2017] [Revised: 03/03/2017] [Accepted: 03/04/2017] [Indexed: 02/07/2023]
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Cantin O, Siepmann F, Danede F, Willart J, Karrout Y, Siepmann J. PEO hot melt extrudates for controlled drug delivery: Importance of the molecular weight. J Drug Deliv Sci Technol 2016. [DOI: 10.1016/j.jddst.2016.09.003] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Gasmi H, Siepmann F, Hamoudi M, Danede F, Verin J, Willart JF, Siepmann J. Towards a better understanding of the different release phases from PLGA microparticles: Dexamethasone-loaded systems. Int J Pharm 2016; 514:189-199. [DOI: 10.1016/j.ijpharm.2016.08.032] [Citation(s) in RCA: 50] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2016] [Revised: 08/03/2016] [Accepted: 08/15/2016] [Indexed: 02/03/2023]
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Gehrke M, Sircoglou J, Gnansia D, Tourrel G, Willart JF, Danede F, Lacante E, Vincent C, Siepmann F, Siepmann J. Ear Cubes for local controlled drug delivery to the inner ear. Int J Pharm 2016; 509:85-94. [DOI: 10.1016/j.ijpharm.2016.04.003] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2016] [Revised: 03/31/2016] [Accepted: 04/01/2016] [Indexed: 02/06/2023]
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Gasmi H, Willart JF, Danede F, Hamoudi M, Siepmann J, Siepmann F. Importance of PLGA microparticle swelling for the control of prilocaine release. J Drug Deliv Sci Technol 2015. [DOI: 10.1016/j.jddst.2015.10.009] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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Gasmi H, Danede F, Siepmann J, Siepmann F. Does PLGA microparticle swelling control drug release? New insight based on single particle swelling studies. J Control Release 2015; 213:120-127. [DOI: 10.1016/j.jconrel.2015.06.039] [Citation(s) in RCA: 60] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2015] [Revised: 06/27/2015] [Accepted: 06/29/2015] [Indexed: 12/11/2022]
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Willart JF, Danede F, De Gusseme A, Descamps M, Neves C. Origin of the Dual Structural Transformation of Trehalose Dihydrate upon Dehydration. J Phys Chem B 2003. [DOI: 10.1021/jp034679f] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- J. F. Willart
- Laboratoire de Dynamique et Structure des Matériaux Moléculaires, UMR CNRS 8024 - ERT 1018, Université de Lille 1, Bât. P5, 59655 Villeneuve d’Ascq, France, and Laboratoire de Physique Appliquée, Département des Sciences Pharmaceutiques, Centre de Recherches Aventis, 94400 Vitry-sur-Seine, France
| | - F. Danede
- Laboratoire de Dynamique et Structure des Matériaux Moléculaires, UMR CNRS 8024 - ERT 1018, Université de Lille 1, Bât. P5, 59655 Villeneuve d’Ascq, France, and Laboratoire de Physique Appliquée, Département des Sciences Pharmaceutiques, Centre de Recherches Aventis, 94400 Vitry-sur-Seine, France
| | - A. De Gusseme
- Laboratoire de Dynamique et Structure des Matériaux Moléculaires, UMR CNRS 8024 - ERT 1018, Université de Lille 1, Bât. P5, 59655 Villeneuve d’Ascq, France, and Laboratoire de Physique Appliquée, Département des Sciences Pharmaceutiques, Centre de Recherches Aventis, 94400 Vitry-sur-Seine, France
| | - M. Descamps
- Laboratoire de Dynamique et Structure des Matériaux Moléculaires, UMR CNRS 8024 - ERT 1018, Université de Lille 1, Bât. P5, 59655 Villeneuve d’Ascq, France, and Laboratoire de Physique Appliquée, Département des Sciences Pharmaceutiques, Centre de Recherches Aventis, 94400 Vitry-sur-Seine, France
| | - C. Neves
- Laboratoire de Dynamique et Structure des Matériaux Moléculaires, UMR CNRS 8024 - ERT 1018, Université de Lille 1, Bât. P5, 59655 Villeneuve d’Ascq, France, and Laboratoire de Physique Appliquée, Département des Sciences Pharmaceutiques, Centre de Recherches Aventis, 94400 Vitry-sur-Seine, France
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