1
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A multiple controlled-release hydrophilicity minocycline hydrochloride delivery system for the efficient treatment of periodontitis. Int J Pharm 2023; 636:122802. [PMID: 36894039 DOI: 10.1016/j.ijpharm.2023.122802] [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: 11/29/2022] [Revised: 02/04/2023] [Accepted: 03/02/2023] [Indexed: 03/09/2023]
Abstract
The complexity of periodontitis, including the complex formation mechanisms and the complex periodontium physiological environment, as well as the complex association with multiple complications, often results in poor therapy effects. Herein, we aimed to design a nanosystem with a controlled release of minocycline hydrochloride (MH) and good retention to effectively treat periodontitis by inhibiting inflammation and repairing the alveolar bone. Firstly, insoluble ion-pairing (IIP) complexes were constructed to improve the encapsulation efficiency of hydrophilic MH in PLGA nanoparticles. Then, a nanogenerator was constructed and combined with a double emulsion method to encapsulate the complexes into PLGA nanoparticles (MH-NPs). The average particle size of MH-NPs was about 100 nm as observed by AFM and TEM, and the drug loading and encapsulation efficiency were 9.59% and 95.58%, respectively. Finally, a multifunctional system (MH-NPs-in-gels) was prepared by dispersing MH-NPs into thermosensitive gels, which could continue to release drug for 21 days in vitro. And the release mechanism showed that this controlled release behavior for MH was influenced by the insoluble ion-pairing complex, PLGA nanoparticles, and gels. In addition, the periodontitis rat model was established to investigate the pharmacodynamic effects. After 4 weeks of treatment, changes in the alveolar bone were assessed by Micro-CT (BV/TV: 70.88%; BMD: 0.97 g/cm3; TB.Th: 0.14 mm; Tb.N: 6.39 mm-1; Tb.Sp: 0.07 mm). The mechanism of MH-NPs-in-gels in vivo was clarified by the analysis of pharmacodynamic results, which showed that insoluble ion-pairing complexes with the aid of PLGA nanoparticles and gels achieved significant anti-inflammatory effects and bone repair capabilities. In conclusion, the multiple controlled-release hydrophilicity MH delivery system would have good prospects for the effective treatment of periodontitis.
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Heredia NS, Vizuete K, Flores-Calero M, Pazmiño V. K, Pilaquinga F, Kumar B, Debut A. Comparative statistical analysis of the release kinetics models for nanoprecipitated drug delivery systems based on poly(lactic-co-glycolic acid). PLoS One 2022; 17:e0264825. [PMID: 35271644 PMCID: PMC8912140 DOI: 10.1371/journal.pone.0264825] [Citation(s) in RCA: 31] [Impact Index Per Article: 15.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2021] [Accepted: 02/18/2022] [Indexed: 11/25/2022] Open
Abstract
Poly(lactic-co-glycolic acid) is one of the most used polymers for drug delivery systems (DDSs). It shows excellent biocompatibility, biodegradability, and allows spatio-temporal control of the release of a drug by altering its chemistry. In spite of this, few formulations have reached the market. To characterize and optimize the drug release process, mathematical models offer a good alternative as they allow interpreting and predicting experimental findings, saving time and money. However, there is no general model that describes all types of drug release of polymeric DDSs. This study aims to perform a statistical comparison of several mathematical models commonly used in order to find which of them best describes the drug release profile from PLGA particles synthesized by nanoprecipitation method. For this purpose, 40 datasets extracted from scientific articles published since 2016 were collected. Each set was fitted by the models: order zero to fifth order polynomials, Korsmeyer-Peppas, Weibull and Hyperbolic Tangent Function. Some data sets had few observations that do not allow to apply statistic test, thus bootstrap resampling technique was performed. Statistic evidence showed that Hyperbolic Tangent Function model is the one that best fit most of the data.
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Affiliation(s)
- Nathaly S. Heredia
- Departamento de Ciencias de la Vida y la Agricultura, Universidad de las Fuerzas Armadas ESPE, Sangolquí, Pichincha, Ecuador
| | - Karla Vizuete
- Centro de Nanociencia y Nanotecnología CENCINAT, Universidad de las Fuerzas Armadas ESPE, Sangolquí, Pichincha, Ecuador
- * E-mail:
| | - Marco Flores-Calero
- Departamento de Eléctrica, Electrónica y Telecomunicaciones, Universidad de las Fuerzas Armadas ESPE, Sangolquí, Pichincha, Ecuador
| | - Katherine Pazmiño V.
- Centro de Nanociencia y Nanotecnología CENCINAT, Universidad de las Fuerzas Armadas ESPE, Sangolquí, Pichincha, Ecuador
| | - Fernanda Pilaquinga
- Escuela de Ciencias Químicas, Pontificia Universidad Católica del Ecuador, Quito, Pichincha, Ecuador
| | - Brajesh Kumar
- Department of Chemistry, TATA College, Chaibasa, Jharkhand, India
| | - Alexis Debut
- Departamento de Ciencias de la Vida y la Agricultura, Universidad de las Fuerzas Armadas ESPE, Sangolquí, Pichincha, Ecuador
- Centro de Nanociencia y Nanotecnología CENCINAT, Universidad de las Fuerzas Armadas ESPE, Sangolquí, Pichincha, Ecuador
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3
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Zhang T, Chen H, Guo X, Yu Y, Wulamu A. A structure dynamic interaction multiscale method for degradation modeling of bioresorbable polyesters. Polym Degrad Stab 2021. [DOI: 10.1016/j.polymdegradstab.2021.109704] [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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4
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Alghamdi M, Gumbleton M, Newland B. Local delivery to malignant brain tumors: potential biomaterial-based therapeutic/adjuvant strategies. Biomater Sci 2021; 9:6037-6051. [PMID: 34357362 DOI: 10.1039/d1bm00896j] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Glioblastoma (GBM) is the most aggressive malignant brain tumor and is associated with a very poor prognosis. The standard treatment for newly diagnosed patients involves total tumor surgical resection (if possible), plus irradiation and adjuvant chemotherapy. Despite treatment, the prognosis is still poor, and the tumor often recurs within two centimeters of the original tumor. A promising approach to improving the efficacy of GBM therapeutics is to utilize biomaterials to deliver them locally at the tumor site. Local delivery to GBM offers several advantages over systemic administration, such as bypassing the blood-brain barrier and increasing the bioavailability of the therapeutic at the tumor site without causing systemic toxicity. Local delivery may also combat tumor recurrence by maintaining sufficient drug concentrations at and surrounding the original tumor area. Herein, we critically appraised the literature on local delivery systems based within the following categories: polymer-based implantable devices, polymeric injectable systems, and hydrogel drug delivery systems. We also discussed the negative effect of hypoxia on treatment strategies and how one might utilize local implantation of oxygen-generating biomaterials as an adjuvant to enhance current therapeutic strategies.
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Affiliation(s)
- Majed Alghamdi
- School of Pharmacy and Pharmaceutical Sciences, Cardiff University, King Edward VII Avenue, Cardiff, CF10 3NB, UK. and Faculty of Pharmacy, King Abdulaziz University, Jeddah, 22522, Kingdom of Saudi Arabia
| | - Mark Gumbleton
- School of Pharmacy and Pharmaceutical Sciences, Cardiff University, King Edward VII Avenue, Cardiff, CF10 3NB, UK.
| | - Ben Newland
- School of Pharmacy and Pharmaceutical Sciences, Cardiff University, King Edward VII Avenue, Cardiff, CF10 3NB, UK. and Leibniz-Institut für Polymerforschung Dresden, Max Bergmann Center of Biomaterials Dresden, Hohe Straße 6, D-01069 Dresden, Germany
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5
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Shurshina A, Bazunova M, Chernova V, Galina A, Titlova A, Kulish E. The impact of polymers’ supramolecular structure on water vapour sorption and drug release from films on the basis of some polysaccharide. J Drug Deliv Sci Technol 2021. [DOI: 10.1016/j.jddst.2021.102560] [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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6
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Strength modeling for degradation of bioresorbable polyesters based on phase image pattern recognition. Polym Degrad Stab 2020. [DOI: 10.1016/j.polymdegradstab.2020.109291] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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7
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Gawley M, Almond L, Daniel S, Lastakchi S, Kaur S, Detta A, Cruickshank G, Miller R, Hingtgen S, Sheets K, McConville C. Development and in vivo evaluation of Irinotecan-loaded Drug Eluting Seeds (iDES) for the localised treatment of recurrent glioblastoma multiforme. J Control Release 2020; 324:1-16. [PMID: 32407745 DOI: 10.1016/j.jconrel.2020.05.012] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2020] [Revised: 04/01/2020] [Accepted: 05/06/2020] [Indexed: 12/12/2022]
Abstract
Glioblastoma multiforme (GBM) is impossible to fully remove surgically and almost always recurs at the borders of the resection cavity, while systemic delivery of therapeutic drug levels to the brain tumour is limited by the blood-brain barrier. This research describes the development of a novel formulation of Irinotecan-loaded Drug Eluting Seeds (iDES) for insertion into the margin of the GBM resection cavity to provide a sustained high local dose with reduced systemic toxicities. We used primary GBM cells from both the tumour core and Brain Around the Tumour tissue from recurrent GBM patients to demonstrate that irinotecan is more effective than temozolomide. Irinotecan had a 75% response rate, while only 50% responded to temozolomide. With temozolomide the cell viability was never below 80% whereas irinotecan achieved cell viabilities of less than 44%. The iDES were manufactured using a hot melt extrusion process with accurate irinotecan drug loadings and the same cytotoxicity as unformulated irinotecan. The iDES released irinotecan in a sustained fashion for up to 7 days. However, only the 30, 40 and 50% w/w loaded iDES formulations released the 300 to 1000 μg of irinotecan needed to be effective in vivo. The 30 and 40% w/w iDES formulations containing 10% plasticizer and either 60 or 50% PLGA prolonged survival from 27 to 70 days in a GBM xenograft mouse resection model with no sign of tumour recurrence. The 30% w/w iDES formulations showed equivalent toxicity to a placebo in non-tumour bearing mice. This innovative drug delivery approach could transform the treatment of recurrent GBM patients by improving survival and reducing toxicity.
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Affiliation(s)
- Matthew Gawley
- School of Pharmacy, Institute of Clinical Sciences, College of Medical and Dental Sciences, University of Birmingham, Edgbaston B15 2TT, United Kingdom
| | - Lorna Almond
- School of Pharmacy, Institute of Clinical Sciences, College of Medical and Dental Sciences, University of Birmingham, Edgbaston B15 2TT, United Kingdom
| | - Senam Daniel
- School of Pharmacy, Institute of Clinical Sciences, College of Medical and Dental Sciences, University of Birmingham, Edgbaston B15 2TT, United Kingdom
| | - Sarah Lastakchi
- School of Pharmacy, Institute of Clinical Sciences, College of Medical and Dental Sciences, University of Birmingham, Edgbaston B15 2TT, United Kingdom
| | - Sharnjit Kaur
- School of Pharmacy, Institute of Clinical Sciences, College of Medical and Dental Sciences, University of Birmingham, Edgbaston B15 2TT, United Kingdom
| | - Allah Detta
- Department of Neurosurgery, University Hospitals Birmingham, NHS Foundation Trust, United Kingdom
| | - Garth Cruickshank
- Department of Neurosurgery, University Hospitals Birmingham, NHS Foundation Trust, United Kingdom
| | - Ryan Miller
- Division of Neuropathology, Department of Pathology and Laboratory Medicine, School of Medicine, University of North Carolina at Chapel Hill, Chapel Hill, NC, United States of America; Departments of Neurology and Pharmacology, School of Medicine, University of North Carolina at Chapel Hill, Chapel Hill, NC, United States of America; Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC, United States; Neuroscience Center, University of North Carolina at Chapel Hill, Chapel Hill, NC, United States
| | - Shawn Hingtgen
- Division of Molecular Pharmaceutics, UNC Eshelman School of Pharmacy, The University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA
| | - Kevin Sheets
- 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, Institute of Clinical Sciences, College of Medical and Dental Sciences, University of Birmingham, Edgbaston B15 2TT, United Kingdom.
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Liu JS, Peng SJ, Li GF, Zhao YX, Meng XY, Yu XR, Li ZH, Chen JM. Polydopamine Nanoparticles for Deep Brain Ablation via Near-Infrared Irradiation. ACS Biomater Sci Eng 2019; 6:664-672. [PMID: 33463219 DOI: 10.1021/acsbiomaterials.9b01097] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Local resection or ablation remains an important approach to treat drug-resistant central neurological disease. Conventional surgical approaches are designed to resect the diseased tissues. The emergence of photothermal therapy (PTT) offers a minimally invasive alternative. However, their poor penetration and potential off-target effect limit their clinical application. Here, polydopamine nanoparticles (PDA-NPs) were prepared and characterized. Studies were performed to evaluate whether PDA-NPs combined with near-infrared (NIR) light can be used to ablate deep brain structures in vitro and in vivo. PDA-NPs were prepared with a mean diameter of ∼150 nm. The particles show excellent photothermal conversion efficiency. PDA-NPs did not show remarkable cytotoxicity against neuronal-like SH-SY5Y cell lines. However, it can cause significant cell death when combined with NIR irradiation. Transcranial NIR irradiation after PDA-NPs administration induced enhanced local hyperthermia as compared with NIR alone. Local temperature exceeded 60 °C after 6 min of irradiation plus PDA while it can only reach 48 °C with NIR alone. PTT with PDA (10 mg/mL, 3 μL) and NIR (1.5 W/cm2) can ablate deep brain structures precisely with an ablation volume of ∼6.5 mm3. Histological analysis confirmed necrosis and apoptosis in the targeted area. These results demonstrate the potential of NP-assisted PTT for the treatment against nontumorous central neurological diseases.
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Affiliation(s)
- Jian-Sheng Liu
- Department of Neurology, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, 639 Zhizao Road, Shanghai 200011, PR China
| | - Shao-Jun Peng
- Zhuhai Precision Medical Center, Zhuhai Hospital of Jinan University, 79 Kangning Road, Zhuhai, Guangdong 519000, PR China
| | - Ge-Fei Li
- Department of Neurology, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, 639 Zhizao Road, Shanghai 200011, PR China
| | - Ya-Xue Zhao
- School of Pharmacy, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, PR China
| | - Xiang-Ying Meng
- Department of Pharmaceutics, School of Pharmacy, Fudan University, 826 Zhangheng Road, Shanghai 201203, PR China
| | - Xiang-Rong Yu
- Zhuhai Precision Medical Center, Zhuhai Hospital of Jinan University, 79 Kangning Road, Zhuhai, Guangdong 519000, PR China
| | - Zhao-Hui Li
- Zhuhai Precision Medical Center, Zhuhai Hospital of Jinan University, 79 Kangning Road, Zhuhai, Guangdong 519000, PR China
| | - Jin-Mei Chen
- Department of Neurology, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, 639 Zhizao Road, Shanghai 200011, PR China
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9
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Barnabas W. Drug targeting strategies into the brain for treating neurological diseases. J Neurosci Methods 2019; 311:133-146. [DOI: 10.1016/j.jneumeth.2018.10.015] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2018] [Revised: 10/08/2018] [Accepted: 10/10/2018] [Indexed: 12/17/2022]
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10
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Sewing ACP, Lagerweij T, van Vuurden DG, Meel MH, Veringa SJE, Carcaboso AM, Gaillard PJ, Peter Vandertop W, Wesseling P, Noske D, Kaspers GJL, Hulleman E. Preclinical evaluation of convection-enhanced delivery of liposomal doxorubicin to treat pediatric diffuse intrinsic pontine glioma and thalamic high-grade glioma. J Neurosurg Pediatr 2017; 19:518-530. [PMID: 28291423 DOI: 10.3171/2016.9.peds16152] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
OBJECTIVE Pediatric high-grade gliomas (pHGGs) including diffuse intrinsic pontine gliomas (DIPGs) are primary brain tumors with high mortality and morbidity. Because of their poor brain penetrance, systemic chemotherapy regimens have failed to deliver satisfactory results; however, convection-enhanced delivery (CED) may be an alternative mode of drug delivery. Anthracyclines are potent chemotherapeutics that have been successfully delivered via CED in preclinical supratentorial glioma models. This study aims to assess the potency of anthracyclines against DIPG and pHGG cell lines in vitro and to evaluate the efficacy of CED with anthracyclines in orthotopic pontine and thalamic tumor models. METHODS The sensitivity of primary pHGG cell lines to a range of anthracyclines was tested in vitro. Preclinical CED of free doxorubicin and pegylated liposomal doxorubicin (PLD) to the brainstem and thalamus of naïve nude mice was performed. The maximum tolerated dose (MTD) was determined based on the observation of clinical symptoms, and brains were analyzed after H & E staining. Efficacy of the MTD was tested in adult glioma E98-FM-DIPG and E98-FM-thalamus models and in the HSJD-DIPG-007-Fluc primary DIPG model. RESULTS Both pHGG and DIPG cells were sensitive to anthracyclines in vitro. Doxorubicin was selected for further preclinical evaluation. Convection-enhanced delivery of the MTD of free doxorubicin and PLD in the pons was 0.02 mg/ml, and the dose tolerated in the thalamus was 10 times higher (0.2 mg/ml). Free doxorubicin or PLD via CED was ineffective against E98-FM-DIPG or HSJD-DIPG-007-Fluc in the brainstem; however, when applied in the thalamus, 0.2 mg/ml of PLD slowed down tumor growth and increased survival in a subset of animals with small tumors. CONCLUSIONS Local delivery of doxorubicin to the brainstem causes severe toxicity, even at doxorubicin concentrations that are safe in the thalamus. As a consequence, the authors could not establish a therapeutic window for treating orthotopic brainstem tumors in mice. For tumors in the thalamus, therapeutic concentrations to slow down tumor growth could be reached. These data suggest that anatomical location determines the severity of toxicity after local delivery of therapeutic agents and that caution should be used when translating data from supratentorial CED studies to treat infratentorial tumors.
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Affiliation(s)
- A Charlotte P Sewing
- Departments of 1 Pediatric Oncology.,Neuro-Oncology Research Group.,Brain Tumor Center Amsterdam, VU University Medical Center, Amsterdam
| | - Tonny Lagerweij
- Neurosurgery, and.,Neuro-Oncology Research Group.,Brain Tumor Center Amsterdam, VU University Medical Center, Amsterdam
| | - Dannis G van Vuurden
- Departments of 1 Pediatric Oncology.,Neuro-Oncology Research Group.,Brain Tumor Center Amsterdam, VU University Medical Center, Amsterdam
| | - Michaël H Meel
- Departments of 1 Pediatric Oncology.,Neurosurgery, and.,Brain Tumor Center Amsterdam, VU University Medical Center, Amsterdam
| | - Susanna J E Veringa
- Departments of 1 Pediatric Oncology.,Neuro-Oncology Research Group.,Brain Tumor Center Amsterdam, VU University Medical Center, Amsterdam
| | - Angel M Carcaboso
- Preclinical Therapeutics and Drug Delivery Research Program, Department of Oncology, Hospital Sant Joan de Déu Barcelona, Spain
| | | | - W Peter Vandertop
- Neurosurgery, and.,Brain Tumor Center Amsterdam, VU University Medical Center, Amsterdam
| | - Pieter Wesseling
- Pathology.,Neuro-Oncology Research Group.,Brain Tumor Center Amsterdam, VU University Medical Center, Amsterdam.,2-BBB Medicines, Leiden.,Department of Pathology, RadboudUMC, Nijmegen
| | - David Noske
- Neurosurgery, and.,Neuro-Oncology Research Group.,Brain Tumor Center Amsterdam, VU University Medical Center, Amsterdam
| | - Gertjan J L Kaspers
- Neuro-Oncology Research Group.,Academy of Princess Máxima Center for Pediatric Oncology, Utrecht, The Netherlands ; and
| | - Esther Hulleman
- Departments of 1 Pediatric Oncology.,Neuro-Oncology Research Group.,Brain Tumor Center Amsterdam, VU University Medical Center, Amsterdam
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11
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Zhang T, Zhou S, Gao X, Yang Z, Sun L, Zhang D. A multi-scale method for modeling degradation of bioresorbable polyesters. Acta Biomater 2017; 50:462-475. [PMID: 28017865 DOI: 10.1016/j.actbio.2016.12.046] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2016] [Revised: 12/14/2016] [Accepted: 12/21/2016] [Indexed: 10/20/2022]
Abstract
A multi-scale model using the cellular automata (CA) and kinetic Monte Carlo (KMC) methods is presented to simulate the degradation process of bioresorbable polyesters such as polylactide (PLA), polyglycolide (PGA) and their copolymers. The model considers the underlying chemical and physical events such as polymer chain scission, oligomer production, crystallization induced by polymer chain scissions, oligomer diffusion and microstructure evolution due to erosion of the small chains. A macroscopic device is discretized into an array of mesoscopic cells. Each cellular lattice is assumed to be made of one polymer chain, which undergoes hydrolysis reaction. The polymer chain scission is modeled using a kinetic Monte Carlo method. Oligomer production, chain crystallization and formation of cavities due to polymer collapse are also modeled on the cellular lattice. Oligomer diffusion is modeled by using Fick's laws at the macroscopic scale. The diffusion coefficient is taken as dependent on the porosity caused by the formation of the cavities. The interactions among the microscopic hydrolysis reaction, mesoscopic formation of cavities and macroscopic diffusion are taken into account. The proposed method forms Multi Scale Cellular Monte Carlo Automata (MS-CMCA). The three-scale approach consists of continuous method and discrete method to deal with certainty problem with underlying stochastic phenomenon. Demonstration examples are provided which show that the model can fit with experimental data in the literature very well. STATEMENT OF SIGNIFICANCE The original work in this paper is a multi-scale method (including micro scale, mesoscopic scale, macro scale and their coupling) for modeling degradation of bioresorbable polyesters and provides understanding to the process of degradation of biodegradable polymers. The result denotes the solution is reliable. As we know, there have no papers recently to implement three scales modeling and its coupling. There is a two-scale model of amorphous polyester degradation described by Han and Pan (Acta Biomaterialia 2011), our model accounts for effects of re-crystallization to explain the degradation process from three scales and takes into account of copolymers. From our model, the molecular weight distribution with time, chain number with time, degree of crystallinity with time, the evolution of polymer inner shape, weight loss with time (which is found from calculation that both oligomer diffusion and small molecules solution work to the weight loss) can be obtained from the calculation of the three scale model.
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12
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Formulation, functional evaluation and ex vivo performance of thermoresponsive soluble gels - A platform for therapeutic delivery to mucosal sinus tissue. Eur J Pharm Sci 2016; 96:499-507. [PMID: 27771516 DOI: 10.1016/j.ejps.2016.10.017] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2016] [Revised: 10/14/2016] [Accepted: 10/17/2016] [Indexed: 11/20/2022]
Abstract
Mucoadhesive in situ gelling systems (soluble gels) have received considerable attention recently as effective stimuli-transforming vectors for a range of drug delivery applications. Considering this fact, the present work involves systematic formulation development, optimization, functional evaluation and ex vivo performance of thermosensitive soluble gels containing dexamethasone 21-phosphate disodium salt (DXN) as the model therapeutic. A series of in situ gel-forming systems comprising the thermoreversible polymer poloxamer-407 (P407), along with hydroxypropyl methyl cellulose (HPMC) and chitosan were first formulated. The optimized soluble gels were evaluated for their potential to promote greater retention at the mucosal surface, for improved therapeutic efficacy, compared to existing solution/suspension-based steroid formulations used clinically. Optimized soluble gels demonstrated a desirable gelation temperature with Newtonian fluid behaviour observed under storage conditions (4-8°C), and pseudoplastic fluid behaviour recorded at nasal cavity/sinus temperature (≈34°C). The in vitro characterization of formulations including rheological evaluation, textural analysis and mucoadhesion studies of the gel form were investigated. Considerable improvement in mechanical properties and mucoadhesion was observed with incorporation of HPMC and chitosan into the gelling systems. The lead poloxamer-based soluble gels, PGHC4 and PGHC7, which were carried through to ex vivo permeation studies displayed extended drug release profiles in conditions mimicking the human nasal cavity, which indicates their suitability for treating a range of conditions affecting the nasal cavity/sinuses.
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13
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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] [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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14
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Ellis JA, Banu M, Hossain SS, Singh-Moon R, Lavine SD, Bruce JN, Joshi S. Reassessing the Role of Intra-Arterial Drug Delivery for Glioblastoma Multiforme Treatment. JOURNAL OF DRUG DELIVERY 2015; 2015:405735. [PMID: 26819758 PMCID: PMC4706947 DOI: 10.1155/2015/405735] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/06/2015] [Accepted: 11/16/2015] [Indexed: 12/16/2022]
Abstract
Effective treatment for glioblastoma (GBM) will likely require targeted delivery of several specific pharmacological agents simultaneously. Intra-arterial (IA) delivery is one technique for targeting the tumor site with multiple agents. Although IA chemotherapy for glioblastoma (GBM) has been attempted since the 1950s, the predicted benefits remain unproven in clinical practice. This review focuses on innovative approaches to IA drug delivery in treating GBM. Guided by novel in vitro and in vivo optical measurements, newer pharmacokinetic models promise to better define the complex relationship between background cerebral blood flow and drug injection parameters. Advanced optical technologies and tracers, unique nanoparticles designs, new cellular targets, and rational drug formulations are continuously modifying the therapeutic landscape for GBM. Personalized treatment approaches are emerging; however, such tailored approaches will largely depend on effective drug delivery techniques and on the ability to simultaneously deliver multidrug regimens. These new paradigms for tumor-selective drug delivery herald dramatic improvements in the effectiveness of IA chemotherapy for GBM. Therefore, within this context of so-called "precision medicine," the role of IA delivery for GBM is thoroughly reassessed.
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Affiliation(s)
- Jason A. Ellis
- Department of Neurological Surgery, Columbia University Medical Center, New York, NY 10032, USA
| | - Matei Banu
- Department of Neurological Surgery, Columbia University Medical Center, New York, NY 10032, USA
| | - Shaolie S. Hossain
- Department of Molecular Cardiology, Texas Heart Institute, Houston, TX 77030, USA
| | - Rajinder Singh-Moon
- School of Engineering and Applied Science, Columbia University, New York, NY 10032, USA
| | - Sean D. Lavine
- Department of Neurological Surgery, Columbia University Medical Center, New York, NY 10032, USA
| | - Jeffrey N. Bruce
- Department of Neurological Surgery, Columbia University Medical Center, New York, NY 10032, USA
| | - Shailendra Joshi
- Department of Anesthesiology, Columbia University Medical Center, New York, NY 10032, USA
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15
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Gehrke M, Sircoglou J, Vincent C, Siepmann J, Siepmann F. How to adjust dexamethasone mobility in silicone matrices: A quantitative treatment. Eur J Pharm Biopharm 2015; 100:27-37. [PMID: 26686648 DOI: 10.1016/j.ejpb.2015.11.018] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2015] [Revised: 10/28/2015] [Accepted: 11/30/2015] [Indexed: 01/12/2023]
Abstract
Silicone-based drug delivery systems offer a great potential to improve the therapeutic efficacy and safety of a large variety of medical treatments, e.g. allowing for local long-term delivery of active agents to the inner ear. Different formulation parameters can be varied to adjust desired drug release kinetics. However, often only qualitative information is available on their effects, and product optimization is cumbersome. The aim of this study was to provide a quantitative analysis, allowing also for theoretical predictions of the impact of the device design on system performance. Dexamethasone was incorporated into thin films based on different types of silicones (e.g. varying in the type of side chains and contents of amorphous silica), optionally containing different types and amounts of poly(ethylene glycol) (PEG) (5% or 10%). Furthermore, the initial drug content was altered (from 10% to 50%). In most cases, an analytical solution of Fick's second law could be used to describe the resulting drug release kinetics from the films and to determine the respective "apparent" diffusion coefficient of the drug (which varied from 2×10(-14) to 2×10(-12)cm(2)/s, depending on the system's composition). Thus, the impact of the investigated formulation parameters on drug mobility in the polymeric matrices could be quantitatively described. Importantly, the knowledge of the "apparent" drug diffusivity can be used to theoretically predict the resulting release kinetics from dosage forms of arbitrary size and shape. For instance, dexamethasone release was theoretically predicted from cylindrical extrudates based on a selection of different silicone types. Interestingly, these predictions could be confirmed by independent experiments. Hence, this type of quantitative analysis can replace time-consuming and cost-intensive series of trial-and-error experiments during product optimization. This is particularly helpful, if long-term drug release (e.g., during several weeks, months or years) is targeted.
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Affiliation(s)
- M Gehrke
- Univ. Lille, F-59000 Lille, France; INSERM U1008, 3 Rue du Prof. Laguesse, F-59006 Lille, France
| | - J Sircoglou
- INSERM U1008, 3 Rue du Prof. Laguesse, F-59006 Lille, France; University Hospital of Lille, Otology and Neurotology Department, F-59037 Lille, France
| | - C Vincent
- INSERM U1008, 3 Rue du Prof. Laguesse, F-59006 Lille, France; University Hospital of Lille, Otology and Neurotology Department, F-59037 Lille, France
| | - J Siepmann
- Univ. Lille, F-59000 Lille, France; INSERM U1008, 3 Rue du Prof. Laguesse, F-59006 Lille, France.
| | - F Siepmann
- Univ. Lille, F-59000 Lille, France; INSERM U1008, 3 Rue du Prof. Laguesse, F-59006 Lille, France
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16
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Nanoparticle delivery and particle diffusion in confined and complex environments. J Drug Deliv Sci Technol 2015. [DOI: 10.1016/j.jddst.2015.06.017] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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17
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Hot melt extruded and injection moulded disulfiram-loaded PLGA millirods for the treatment of glioblastoma multiforme via stereotactic injection. Int J Pharm 2015; 494:73-82. [PMID: 26235918 DOI: 10.1016/j.ijpharm.2015.07.072] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2015] [Revised: 07/24/2015] [Accepted: 07/28/2015] [Indexed: 10/23/2022]
Abstract
Glioblastoma multiforme (GBM) has a poor prognosis and is one of the most common primary malignant brain tumours in adults. Stereotactic injections have been used to deliver chemotherapeutic drugs directly into brain tumours. This paper describes the development of disulfiram (DSF)-loaded biodegradable millirods manufactured using hot melt extrusion (HME) and injection moulding (IM). The paper demonstrates that the stability of the DSF within the millirods is dependent on the manufacturing technique used as well as the drug loading. The physical state of the DSF within the millirods was dependent on the fabrication process, with the DSF in the HME millirods being either completely amorphous within the PLGA, while the DSF within the IM millirods retained between 54 and 66% of its crystallinity. Release of DSF from the millirods was dependent on the degradation rate of the PLGA, the manufacturing technique used as well as the DSF loading. DSF in the 10% (w/w) DSF loaded HME millirods and the 20% (w/w) DSF-loaded HME and IM millirods had a similar cytotoxicity against a GBM cell line compared to the unprocessed DSF control. However, the 10% (w/w) DSF-loaded IM millirods had a significantly lower cytotoxicity when compared to the unprocessed control.
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18
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Nanoparticle-mediated growth factor delivery systems: A new way to treat Alzheimer's disease. J Control Release 2015; 206:187-205. [DOI: 10.1016/j.jconrel.2015.03.024] [Citation(s) in RCA: 49] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2015] [Revised: 03/19/2015] [Accepted: 03/20/2015] [Indexed: 01/03/2023]
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19
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Zembko I, Ahmed I, Farooq A, Dail J, Tawari P, Wang W, Mcconville C. Development of Disulfiram-Loaded Poly(Lactic-co-Glycolic Acid) Wafers for the Localised Treatment of Glioblastoma Multiforme: A Comparison of Manufacturing Techniques. J Pharm Sci 2015; 104:1076-86. [DOI: 10.1002/jps.24304] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2014] [Revised: 08/19/2014] [Accepted: 11/19/2014] [Indexed: 11/06/2022]
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20
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Sustained delivery of cytarabine-loaded vesicular phospholipid gels for treatment of xenografted glioma. Int J Pharm 2014; 472:48-55. [PMID: 24914829 DOI: 10.1016/j.ijpharm.2014.06.005] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2014] [Revised: 05/23/2014] [Accepted: 06/06/2014] [Indexed: 11/23/2022]
Abstract
This study described the development of vesicular phospholipid gels (VPGs) for sustained delivery of cytarabine (Ara-C) for the treatment of xenografted glioma. Ara-C-loaded VPGs in the state of a semisolid phospholipid dispersion looked like numerous vesicles tightly packing together under the freeze-fracture electron microscopy (FF-TEM), their release profiles displayed sustained drug release up to 384 h in vitro. The biodistribution of Ara-C in the rat brain showed that Ara-C-loaded VPGs could maintain therapeutic concentrations up to 5mm distance from the implantation site in brain tissue within 28 days. At the same time, fluorescence micrograph confirmed drug distribution in brain tissue visually. Furthermore, after single administration, Ara-C-loaded VPGs group significantly inhibited the U87-MG glioma growth in right flank in comparison with Ara-C solution (p<0.01). It was explained that the entrapped drug in VPGs could avoid degradation from cytidine deaminase and sustained release of drug from Ara-C-loaded VPGs could maintain the effective therapeutic levels for a long time around the tumor. In conclusion, Ara-C-loaded VPGs, with the properties of sustained release, high penetration capacity, nontoxicity and no shape restriction of the surgical cavity, are promising local delivery systems for post-surgical sustained chemotherapy against glioma.
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21
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Velghe C, Rosiaux Y, Marchaud D, Siepmann J, Siepmann F. In silico simulation of niacin release from lipid tablets: Theoretical predictions and independent experiments. J Control Release 2014; 175:63-71. [DOI: 10.1016/j.jconrel.2013.12.010] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2013] [Revised: 12/06/2013] [Accepted: 12/14/2013] [Indexed: 10/25/2022]
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22
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Mechanisms Controlling Theophylline Release from Ethanol-Resistant Coated Pellets. Pharm Res 2013; 31:731-41. [DOI: 10.1007/s11095-013-1194-1] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2013] [Accepted: 08/09/2013] [Indexed: 10/26/2022]
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23
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Siepmann J. In-silico simulations of advanced drug delivery systems: What will the future offer? Int J Pharm 2013; 454:512-6. [DOI: 10.1016/j.ijpharm.2013.07.018] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2013] [Accepted: 03/20/2013] [Indexed: 10/26/2022]
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24
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Bonartsev A, Boskhomdzhiev A, Voinova V, Makhina T, Myshkina V, Yakovlev S, Zharkova I, Filatova E, Zernov A, Bagrov D, Andreeva N, Rebrov A, Bonartseva G, Iordanskii A. Degradation of Poly(3-hydroxybutyrate) and its Derivatives: Characterization and Kinetic Behavior. CHEMISTRY & CHEMICAL TECHNOLOGY 2012. [DOI: 10.23939/chcht06.04.385] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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25
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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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26
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Impact of the experimental conditions on drug release from parenteral depot systems: From negligible to significant. Int J Pharm 2012; 432:11-22. [DOI: 10.1016/j.ijpharm.2012.04.053] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2012] [Revised: 04/11/2012] [Accepted: 04/21/2012] [Indexed: 11/24/2022]
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27
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Casalini T, Masi M, Perale G. Drug eluting sutures: A model for in vivo estimations. Int J Pharm 2012; 429:148-57. [DOI: 10.1016/j.ijpharm.2012.03.024] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2012] [Revised: 03/12/2012] [Accepted: 03/13/2012] [Indexed: 10/28/2022]
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28
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"Targeting" nanoparticles: the constraints of physical laws and physical barriers. J Control Release 2012; 164:115-24. [PMID: 22484196 DOI: 10.1016/j.jconrel.2012.03.022] [Citation(s) in RCA: 145] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2012] [Revised: 03/10/2012] [Accepted: 03/13/2012] [Indexed: 11/20/2022]
Abstract
In comparison to the complexities of the body, its organs, its normal and aberrant cells, many nanoparticles will appear to be relatively simple objects. This view is deceptive because the physicochemical properties of nanosystems, although quite well understood on the basis of material science, surface science and colloid theory, are far from simple in practice. While their properties are largely controllable in vitro, often purportedly "designed", their administration by any route changing environments conspires to produce additional layers of complexity. Some of the key physical laws and physicochemical parameters governing the fate of nanoparticles on their journey from point of intravenous administration to desired destinations such as tumors are discussed. Much of the science relevant to nanocarrier based targeting has been elaborated in studying purely physical phenomena, but there can be found therein many analogies with biological systems. These include factors that impede quantitative targeting: diffusion in complex media, aggregation and flocculation, hindered behavior of particles in confined spaces, jamming and dispersion in flow. All of these have the ability to influence fate and destination. Most of the critical processes are particle size dependent but not always linearly so. Virtually all processes in vivo involve an element of probability. Particle size and properties can be controlled to a large extent, but stochastic processes cannot by definition. Progress has been made, but the quantitative delivery of a nanocarrier to defined sites in tumors is neither inevitable nor yet predictable.
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29
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Güres S, Siepmann F, Siepmann J, Kleinebudde P. Drug release from extruded solid lipid matrices: Theoretical predictions and independent experiments. Eur J Pharm Biopharm 2012; 80:122-9. [DOI: 10.1016/j.ejpb.2011.10.002] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2011] [Revised: 09/28/2011] [Accepted: 10/03/2011] [Indexed: 11/28/2022]
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30
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Krenzlin S, Vincent C, Munzke L, Gnansia D, Siepmann J, Siepmann F. Predictability of drug release from cochlear implants. J Control Release 2011; 159:60-8. [PMID: 22233971 DOI: 10.1016/j.jconrel.2011.12.032] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2011] [Revised: 12/19/2011] [Accepted: 12/22/2011] [Indexed: 11/17/2022]
Abstract
A simplified mathematical theory is presented allowing for in silico simulation of the effects of key parameters of miniaturized implants (size and composition) on the resulting drug release kinetics. Such devices offer a great potential, especially for local drug treatments, e.g. of the inner ear. However, the preparation and characterization of these systems is highly challenging, due to the small system dimensions. The presented mathematical theory is based on Fick's second law of diffusion. Importantly, theoretical predictions do not require the knowledge of many system-specific parameters: Only the "apparent" diffusion coefficient of the drug within the implant matrix is needed. This parameter can be easily determined via drug release measurements from thin, macroscopic films. The validity of the theoretical model predictions was evaluated by comparison with experimental results obtained with a cochlear implant. The latter consisted of miniaturized electrodes, which were embedded in a silicone matrix loaded with various amounts of dexamethasone. Importantly, independent experimental results confirmed the theoretical predictions. Thus, the presented simplified theory can help to significantly speed up the optimization of this type of controlled drug delivery systems, especially if long release periods are targeted (e.g., several months or years). Straightforward experiments with thin, macroscopic films and computer simulations can allow for rapid identification of optimal system design.
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Affiliation(s)
- S Krenzlin
- University of Lille, College of Pharmacy, 3 Rue du Prof. Laguesse, Lille, France
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31
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Siepmann J, Siepmann F. Modeling of diffusion controlled drug delivery. J Control Release 2011; 161:351-62. [PMID: 22019555 DOI: 10.1016/j.jconrel.2011.10.006] [Citation(s) in RCA: 483] [Impact Index Per Article: 37.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2011] [Revised: 10/04/2011] [Accepted: 10/06/2011] [Indexed: 11/17/2022]
Abstract
Mathematical modeling of drug release can be very helpful to speed up product development and to better understand the mechanisms controlling drug release from advanced delivery systems. Ideally, in silico simulations can quantitatively predict the impact of formulation and processing parameters on the resulting drug release kinetics. The aim of this article is to give an overview on the current state of the art of modeling drug release from delivery systems, which are predominantly controlled by diffusional mass transport. The inner structure of the device, the ratio "initial drug concentration:drug solubility" as well as the device geometry determine which type of mathematical equation must be applied. A straightforward "road map" is given, explaining how to identify the appropriate equation for a particular type of drug delivery system. The respective equations for a broad range of devices are indicated, including reservoir and matrix systems, exhibiting or not an initial excess of drug and the geometry of slabs, spheres and cylinders. The assumptions the models are based on as well as their limitations are pointed out. Practical examples illustrate the usefulness of mathematical modeling of diffusion controlled drug delivery. Due to the advances in information technology the importance of in silico optimization of advanced drug delivery systems can be expected to significantly increase in the future.
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Affiliation(s)
- Juergen Siepmann
- University of Lille, College of Pharmacy, 3 Rue du Prof. Laguesse, 59006 Lille, France.
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32
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Siepmann J, Peppas NA. Higuchi equation: Derivation, applications, use and misuse. Int J Pharm 2011; 418:6-12. [DOI: 10.1016/j.ijpharm.2011.03.051] [Citation(s) in RCA: 580] [Impact Index Per Article: 44.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2011] [Revised: 03/20/2011] [Accepted: 03/22/2011] [Indexed: 11/27/2022]
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33
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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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34
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Mathematical modeling of simultaneous drug release and in vivo absorption. Int J Pharm 2011; 418:130-41. [DOI: 10.1016/j.ijpharm.2010.12.044] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2010] [Revised: 12/22/2010] [Accepted: 12/27/2010] [Indexed: 01/17/2023]
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35
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Simultaneous controlled vitamin release from multiparticulates: Theory and experiment. Int J Pharm 2011; 412:68-76. [DOI: 10.1016/j.ijpharm.2011.04.013] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2011] [Revised: 04/05/2011] [Accepted: 04/06/2011] [Indexed: 11/22/2022]
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36
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Hiremath J, Devi VK. Preparation and in vitro characterization of poly (epsilon-caprolactone)-based tamoxifen citrate-loaded cylindrical subdermal implant for breast cancer. ASIAN JOURNAL OF PHARMACEUTICS 2011. [DOI: 10.4103/0973-8398.80058] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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37
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Huang R, Pan J. Inverse engineering of medical devices made of bioresorbable polymers. Comput Methods Biomech Biomed Engin 2010; 13:291-303. [DOI: 10.1080/10255840903190734] [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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38
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Modeling drug release from PVAc/PVP matrix tablets. J Control Release 2010; 141:216-22. [DOI: 10.1016/j.jconrel.2009.08.027] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2009] [Revised: 08/25/2009] [Accepted: 08/31/2009] [Indexed: 11/22/2022]
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39
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Glaessl B, Siepmann F, Tucker I, Rades T, J.Siepmann. Mathematical modeling of drug release from Eudragit RS-based delivery systems. J Drug Deliv Sci Technol 2010. [DOI: 10.1016/s1773-2247(10)50017-0] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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40
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Drug release from PLGA-based microparticles: Effects of the “microparticle:bulk fluid” ratio. Int J Pharm 2010; 383:123-31. [DOI: 10.1016/j.ijpharm.2009.09.012] [Citation(s) in RCA: 60] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2009] [Revised: 09/02/2009] [Accepted: 09/07/2009] [Indexed: 11/23/2022]
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41
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Ong BY, Ranganath SH, Lee LY, Lu F, Lee HS, Sahinidis NV, Wang CH. Paclitaxel delivery from PLGA foams for controlled release in post-surgical chemotherapy against glioblastoma multiforme. Biomaterials 2009; 30:3189-96. [DOI: 10.1016/j.biomaterials.2009.02.030] [Citation(s) in RCA: 103] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2009] [Accepted: 02/23/2009] [Indexed: 11/17/2022]
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42
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Klose D, Laprais M, Leroux V, Siepmann F, Deprez B, Bordet R, Siepmann J. Fenofibrate-loaded PLGA microparticles: effects on ischemic stroke. Eur J Pharm Sci 2009; 37:43-52. [PMID: 19168134 DOI: 10.1016/j.ejps.2008.12.016] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2008] [Revised: 12/09/2008] [Accepted: 12/27/2008] [Indexed: 11/18/2022]
Abstract
Many drugs are not able to cross the Blood Brain Barrier (BBB) and, thus, cannot reach a target site within the Central Nervous System (CNS). Local controlled drug delivery can help to overcome this restriction. However, this is a highly challenging approach and only one product is yet available on the market: Gliadel, which is used to reduce the risk of local tumor recurrence upon resection of malignant glioma. The aim of this study was to evaluate the potential of local controlled drug delivery to the CNS to reduce the consequences of ischemic stroke. Fenofibrate as well as its active metabolite fenofibric acid were encapsulated within PLGA microparticles. Importantly, fenofibrate-loaded microparticles effectively reduced the consequences of ischemic stroke in Wistar rats: the total, cortical and striatal infarct volumes decreased from 257 to 197, 193 to 139, and 64 to 58 mm(3), respectively. Interestingly, fenofibric acid-loaded microparticles did not show significant in vivo efficacy, which might be attributable to a potentially limited distribution pattern within the brain and/or limited cell uptake. Thus, local controlled drug delivery to the CNS also has a significant potential for the treatment/prevention of other types of diseases than cancer. Furthermore, this approach can help to provide proof of concept in vivo in the early drug discovery phase, if the drug candidate cannot cross the BBB.
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Affiliation(s)
- D Klose
- College of Pharmacy, JE 2491, University of Lille, 3 Rue du Professeur Laguesse, 59006 Lille, France
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43
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Han X, Pan J. A model for simultaneous crystallisation and biodegradation of biodegradable polymers. Biomaterials 2009; 30:423-30. [DOI: 10.1016/j.biomaterials.2008.10.001] [Citation(s) in RCA: 94] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2008] [Accepted: 10/07/2008] [Indexed: 11/26/2022]
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44
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Siepmann J, Siepmann F. Mathematical modeling of drug delivery. Int J Pharm 2008; 364:328-43. [DOI: 10.1016/j.ijpharm.2008.09.004] [Citation(s) in RCA: 837] [Impact Index Per Article: 52.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2008] [Revised: 09/03/2008] [Accepted: 09/04/2008] [Indexed: 11/29/2022]
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45
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Towards More Realistic In Vitro Release Measurement Techniques for Biodegradable Microparticles. Pharm Res 2008; 26:691-9. [DOI: 10.1007/s11095-008-9747-4] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2008] [Accepted: 10/06/2008] [Indexed: 11/26/2022]
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46
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Wang Y, Pan J, Han X, Sinka C, Ding L. A phenomenological model for the degradation of biodegradable polymers. Biomaterials 2008; 29:3393-401. [DOI: 10.1016/j.biomaterials.2008.04.042] [Citation(s) in RCA: 127] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2008] [Accepted: 04/24/2008] [Indexed: 11/26/2022]
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47
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Kreye F, Siepmann F, Siepmann J. Lipid implants as drug delivery systems. Expert Opin Drug Deliv 2008; 5:291-307. [DOI: 10.1517/17425247.5.3.291] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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48
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Jeffrey P, Summerfield SG. Challenges for blood-brain barrier (BBB) screening. Xenobiotica 2008; 37:1135-51. [PMID: 17968740 DOI: 10.1080/00498250701570285] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
Whilst blood-brain barrier permeability is an important determinant in achieving efficacious central nervous system drug concentrations, it should not be viewed or measured in isolation. Recent studies have highlighted the need for an integrated approach where optimal central nervous system penetration is achieved through the correct balance of permeability, a low potential for active efflux, and the appropriate physicochemical properties that allow for drug partitioning and distribution into brain tissue. Integrating data from permeability studies performed incorporating an assessment of active efflux by P-glycoprotein in combination with drug-free fraction measurements in blood and brain has furthered the understanding of the impact of the blood-brain barrier on central nervous system uptake and the underlying physicochemical properties that contribute to central nervous system drug disposition. This approach moves away from screening and ranking compounds in assays designed to measure or predict central nervous system penetration in the somewhat arbitrary units of brain-blood (or plasma) ratios.
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Affiliation(s)
- P Jeffrey
- Neurology & GI Centre of Excellence for Drug Discovery, GlaxoSmithKline, Harlow, UK
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49
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Bergen JM, Park IK, Horner PJ, Pun SH. Nonviral approaches for neuronal delivery of nucleic acids. Pharm Res 2007; 25:983-98. [PMID: 17932730 PMCID: PMC2292496 DOI: 10.1007/s11095-007-9439-5] [Citation(s) in RCA: 97] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2007] [Accepted: 08/20/2007] [Indexed: 12/23/2022]
Abstract
The delivery of therapeutic nucleic acids to neurons has the potential to treat neurological disease and spinal cord injury. While select viral vectors have shown promise as gene carriers to neurons, their potential as therapeutic agents is limited by their toxicity and immunogenicity, their broad tropism, and the cost of large-scale formulation. Nonviral vectors are an attractive alternative in that they offer improved safety profiles compared to viruses, are less expensive to produce, and can be targeted to specific neuronal subpopulations. However, most nonviral vectors suffer from significantly lower transfection efficiencies than neurotropic viruses, severely limiting their utility in neuron-targeted delivery applications. To realize the potential of nonviral delivery technology in neurons, vectors must be designed to overcome a series of extra- and intracellular barriers. In this article, we describe the challenges preventing successful nonviral delivery of nucleic acids to neurons and review strategies aimed at overcoming these challenges.
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Affiliation(s)
- Jamie M Bergen
- Bioengineering, University of Washington, Seattle, WA 98195, USA
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Weinberg BD, Patel RB, Exner AA, Saidel GM, Gao J. Modeling doxorubicin transport to improve intratumoral drug delivery to RF ablated tumors. J Control Release 2007; 124:11-9. [PMID: 17900740 PMCID: PMC2211420 DOI: 10.1016/j.jconrel.2007.08.023] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2007] [Revised: 08/15/2007] [Accepted: 08/16/2007] [Indexed: 12/12/2022]
Abstract
A mathematical model of drug transport provides an ideal strategy to optimize intratumoral drug delivery implants to supplement radiofrequency (RF) ablation for tumor treatment. To simulate doxorubicin transport in non-ablated and ablated liver tumors, a one-dimensional, cylindrically symmetric transport model was generated using a finite element method (FEM). Parameters of this model, the diffusion (D) and elimination (gamma) coefficients for doxorubicin, were estimated using drug distributions measured 4 and 8 days after placing biodegradable implants in non-ablated and ablated rabbit VX2 liver carcinomas. In non-ablated tumor, values of diffusion and elimination parameters were 25% and 94% lower than normal liver tissue, respectively. In ablated tumor, diffusion near the ablation center was 75% higher than non-ablated tumor but decreased to the non-ablated tumor value at the ablation periphery. Drug elimination in ablated tumor was zero for the first four days, but by day 8 returned to 98% of the value for non-ablated tumor. Three-dimensional (3-D) simulations of drug delivery from implants with and without RF thermal ablation underscore the benefit of using RF ablation to facilitate local drug distribution. This study demonstrates the use of computational modeling and optimal parameter estimation to predict local drug pharmacokinetics from intratumoral implants after ablation.
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Affiliation(s)
- Brent D. Weinberg
- Department of Biomedical Engineering, Case Western Reserve University, Cleveland, OH 44106
- Simmons Comprehensive Cancer Center, University of Texas Southwestern Medical Center, Dallas, TX 75390
| | - Ravi B. Patel
- Department of Biomedical Engineering, Case Western Reserve University, Cleveland, OH 44106
| | - Agata A. Exner
- Department of Radiology, Case Western Reserve University, Cleveland, OH 44106
| | - Gerald M. Saidel
- Department of Biomedical Engineering, Case Western Reserve University, Cleveland, OH 44106
| | - Jinming Gao
- Simmons Comprehensive Cancer Center, University of Texas Southwestern Medical Center, Dallas, TX 75390
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