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Cartaxo AL, Fernandes-Platzgummer A, Rodrigues CA, Melo AM, Tecklenburg K, Margreiter E, Day RM, da Silva CL, Cabral JM. Developing a Cell-Microcarrier Tissue-Engineered Product for Muscle Repair Using a Bioreactor System. Tissue Eng Part C Methods 2023; 29:583-595. [PMID: 37842845 PMCID: PMC10714258 DOI: 10.1089/ten.tec.2023.0122] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2023] [Accepted: 09/01/2023] [Indexed: 10/17/2023] Open
Abstract
Fecal incontinence, although not life-threatening, has a high impact on the economy and patient quality of life. So far, available treatments are based on both surgical and nonsurgical approaches. These can range from changes in diet, to bowel training, or sacral nerve stimulation, but none of which provides a long-term solution. New regenerative medicine-based therapies are emerging, which aim at regenerating the sphincter muscle and restoring continence. Usually, these consist of the administration of a suspension of expanded skeletal-derived muscle cells (SkMDCs) to the damaged site. However, this strategy often results in a reduced cell viability due to the need for cell harvesting from the expansion platform, as well as the non-native use of a cell suspension to deliver the anchorage-dependent cells. In this study, we propose the proof-of-concept for the bioprocessing of a new cell delivery method for the treatment of fecal incontinence, obtained by a scalable two-step process. First, patient-isolated SkMDCs were expanded using planar static culture systems. Second, by using a single-use PBS-MINI Vertical-Wheel® bioreactor, the expanded SkMDCs were combined with biocompatible and biodegradable (i.e., directly implantable) poly(lactic-co-glycolic acid) microcarriers prepared by thermally induced phase separation. This process allowed for up to 80% efficiency of SkMDCs to attach to the microcarriers. Importantly, SkMDCs were viable during all the process and maintained their myogenic features (e.g., expression of the CD56 marker) after adhesion and culture on the microcarriers. When SkMDC-containing microcarriers were placed on a culture dish, cells were able to migrate from the microcarriers onto the culture surface and differentiate into multinucleated myotubes, which highlights their potential to regenerate the damaged sphincter muscle after administration into the patient. Overall, this study proposes an innovative method to attach SkMDCs to biodegradable microcarriers, which can provide a new treatment for fecal incontinence.
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Affiliation(s)
- Ana Luísa Cartaxo
- Department of Bioengineering and Institute for Bioengineering and Biosciences (iBB), Instituto Superior Técnico, Universidade de Lisboa, Lisboa, Portugal
- Associate Laboratory, Institute for Health and Bioeconomy (i4HB), Instituto Superior Técnico, Universidade de Lisboa, Lisboa, Portugal
| | - Ana Fernandes-Platzgummer
- Department of Bioengineering and Institute for Bioengineering and Biosciences (iBB), Instituto Superior Técnico, Universidade de Lisboa, Lisboa, Portugal
- Associate Laboratory, Institute for Health and Bioeconomy (i4HB), Instituto Superior Técnico, Universidade de Lisboa, Lisboa, Portugal
| | - Carlos A.V. Rodrigues
- Department of Bioengineering and Institute for Bioengineering and Biosciences (iBB), Instituto Superior Técnico, Universidade de Lisboa, Lisboa, Portugal
- Associate Laboratory, Institute for Health and Bioeconomy (i4HB), Instituto Superior Técnico, Universidade de Lisboa, Lisboa, Portugal
| | - Ana M. Melo
- Department of Bioengineering and Institute for Bioengineering and Biosciences (iBB), Instituto Superior Técnico, Universidade de Lisboa, Lisboa, Portugal
- Associate Laboratory, Institute for Health and Bioeconomy (i4HB), Instituto Superior Técnico, Universidade de Lisboa, Lisboa, Portugal
| | | | | | - Richard M. Day
- Centre for Precision Healthcare, Division of Medicine, University College London, London, United Kingdom
| | - Cláudia L. da Silva
- Department of Bioengineering and Institute for Bioengineering and Biosciences (iBB), Instituto Superior Técnico, Universidade de Lisboa, Lisboa, Portugal
- Associate Laboratory, Institute for Health and Bioeconomy (i4HB), Instituto Superior Técnico, Universidade de Lisboa, Lisboa, Portugal
| | - Joaquim M.S. Cabral
- Department of Bioengineering and Institute for Bioengineering and Biosciences (iBB), Instituto Superior Técnico, Universidade de Lisboa, Lisboa, Portugal
- Associate Laboratory, Institute for Health and Bioeconomy (i4HB), Instituto Superior Técnico, Universidade de Lisboa, Lisboa, Portugal
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2
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Van Tran V, Wi E, Shin SY, Lee D, Kim YA, Ma BC, Chang M. Microgels based on 0D-3D carbon materials: Synthetic techniques, properties, applications, and challenges. CHEMOSPHERE 2022; 307:135981. [PMID: 35964721 DOI: 10.1016/j.chemosphere.2022.135981] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/22/2022] [Revised: 07/22/2022] [Accepted: 08/05/2022] [Indexed: 06/15/2023]
Abstract
Microgels are three-dimensional (3D) colloidal hydrogel particles with outstanding features such as biocompatibility, good mechanical properties, tunable sizes from submicrometer to tens of nanometers, and large surface areas. Because of these unique qualities, microgels have been widely used in various applications. Carbon-based materials (CMs) with various dimensions (0-3D) have recently been investigated as promising candidates for the design and fabrication of microgels because of their large surface area, excellent conductivity, unique chemical stability, and low cost. Here, we provide a critical review of the specific characteristics of CMs that are being incorporated into microgels, as well as the state-of-the art applications of CM-microgels in pollutant adsorption and photodegradation, H2 evoluation, CO2 capture, soil conditioners, water retention, drug delivery, cell encapsulation, and tissue engineering. Advanced preparation techniques for CM-microgel systems are also summarized and discussed. Finally, challenges related to the low colloidal stability of CM-microgels and development strategies are examined. This review shows that CM-microgels have the potential to be widely used in various practical applications.
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Affiliation(s)
- Vinh Van Tran
- Laser and Thermal Engineering Laboratory, Department of Mechanical Engineering, Gachon University, Seongnam, 13120, South Korea
| | - Eunsol Wi
- Department of Polymer Engineering, Graduate School, Chonnam National University, Gwangju, 61186, South Korea
| | - Seo Young Shin
- Department of Polymer Engineering, Graduate School, Chonnam National University, Gwangju, 61186, South Korea
| | - Daeho Lee
- Laser and Thermal Engineering Laboratory, Department of Mechanical Engineering, Gachon University, Seongnam, 13120, South Korea
| | - Yoong Ahm Kim
- Department of Polymer Engineering, Graduate School, Chonnam National University, Gwangju, 61186, South Korea; School of Polymer Science and Engineering, Chonnam National University, Gwangju, 61186, South Korea; Alan G. MacDiarmid Energy Research Institute, Chonnam National University, Gwangju, 61186, South Korea
| | - Byung Chol Ma
- School of Chemical Engineering, Chonnam National University, Gwangju, 61186, South Korea.
| | - Mincheol Chang
- Department of Polymer Engineering, Graduate School, Chonnam National University, Gwangju, 61186, South Korea; School of Polymer Science and Engineering, Chonnam National University, Gwangju, 61186, South Korea; Alan G. MacDiarmid Energy Research Institute, Chonnam National University, Gwangju, 61186, South Korea.
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3
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Formation of disaggregated polymer microspheres by a novel method combining pulsed voltage electrospray and wet phase inversion techniques. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2022.129246] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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4
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Explosive electrostatic instability of ferroelectric liquid droplets on ferroelectric solid surfaces. Proc Natl Acad Sci U S A 2022; 119:e2207858119. [PMID: 35914148 PMCID: PMC9371712 DOI: 10.1073/pnas.2207858119] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023] Open
Abstract
We investigated the electrostatic behavior of ferroelectric liquid droplets exposed to the pyroelectric field of a lithium niobate ferroelectric crystal substrate. The ferroelectric liquid is a nematic liquid crystal, in which almost complete polar ordering of the molecular dipoles generates an internal macroscopic polarization locally collinear to the mean molecular long axis. Upon entering the ferroelectric phase by reducing the temperature from the nematic phase, the liquid crystal droplets become electromechanically unstable and disintegrate by the explosive emission of fluid jets. These jets are mostly interfacial, spreading out on the substrate surface, and exhibit fractal branching out into smaller streams to eventually disrupt, forming secondary droplets. We understand this behavior as a manifestation of the Rayleigh instability of electrically charged fluid droplets, expected when the electrostatic repulsion exceeds the surface tension of the fluid. In this case, the charges are due to the bulk polarization of the ferroelectric fluid, which couples to the pyroelectric polarization of the underlying lithium niobate substrate through its fringing field and solid-fluid interface coupling. Since the ejection of fluid does not neutralize the droplet surfaces, they can undergo multiple explosive events as the temperature decreases.
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5
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Kwan V, Consta S. Conical Shape Fluctuations Determine the Rate of Ion Evaporation and the Emitted Cluster Size Distribution from Multicharged Droplets. J Phys Chem A 2022; 126:3229-3238. [PMID: 35549274 DOI: 10.1021/acs.jpca.2c02056] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The ion evaporation mechanism (IEM) is perceived to be a major pathway for disintegration of multi-ion charged droplets found in atmospheric and sprayed aerosols. However, the precise mechanism of IEM and the effect of the nature of the ions in the emitted cluster size distribution have not yet been established despite its broad use in mass spectrometry and atmospheric chemistry over the past half century. Here, we present a systematic study of the emitted ion cluster distribution in relation to their spatial distribution in the parent droplet using atomistic modeling. It is found that in the parent droplet, multiple kosmotropic and weakly polarizable chaotropic ions (Cs+) are buried deeper within the droplet than polarizable chaotropic ions (Cl-, I-). This differentiation in the ion location is only captured by a polarizable model. It is demonstrated that the emitted cluster size distribution is determined by dynamic conical deformations and not by the equilibrium ion depth within the parent droplet as the IEM models assume. Critical factors that determine the cluster size distribution such as the charge sign asymmetry that have not been considered in models and in experiments are presented. We argue that the existing IEM analytical models do not establish a clear difference between IEM and Rayleigh fission. We propose a shift in the existing view for IEM from the equilibrium properties of the parent droplet to the chemistry in the conical shape fluctuations that serve as the centers for ion emission. Consequently, chemistry in the conical fluctuations may also be a key element to explain charge states of macromolecules in mass spectrometry and may have potential applications in catalysis due to the electric field in the conical region.
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Affiliation(s)
- Victor Kwan
- Department of Chemistry, The University of Western Ontario, London, Ontario N6A 5B7, Canada
| | - Styliani Consta
- Department of Chemistry, The University of Western Ontario, London, Ontario N6A 5B7, Canada
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6
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A toilless quasi-superhydrophobic surface of round cake, microsphere and spindle with high contact angle and high adhesion. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2022.128583] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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7
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Lin J, Huang J, Wu J, Tang B, Li C, Xiao H. Poly(lactic acid-co-glycolic acid)-based celecoxib extended-release microspheres for the local treatment of traumatic heterotopic ossification. J Biomater Appl 2022; 36:1458-1468. [PMID: 35043696 DOI: 10.1177/08853282211056937] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Traumatic heterotopic ossification (THO) is a serious and common clinical post-traumatic complication for which there is no effective and safe drug treatment. Routine administration of nonsteroidal anti-inflammatory drugs (NSAIDs) after injury is extensively used approach for THO. However, serious adverse events can occur in the event of an overdose of NSAIDs. In our study, we have developed a poly(lactic acid-co-glycolic acid) (PLGA) microsphere by emulsifying solvent volatilization for the prolonged slow delivery of celecoxib (CLX). Three groups of celecoxib-poly(lactic acid-co-glycolic acid) microspheres (CLX-PLGA MPs) were prepared with particle sizes of 3.75±1.28 μm, 49.56±17.15 μm, and 94.98±42.53 μm. Meanwhile, related parameters of microspheres in each group were studied: drug loading (DL), encapsulation rate (EE), and slow-release behavior. The DL and EE of the 3 CLX-PLGA MPs did not vary significantly, and subsequently, we selected the second drug loading microspheres with a retardation period of about 70 days for subsequent experiments. Moreover, cellular and animal experiments suggest that the microspheres are biocompatible and can be safely applied to localized trauma tissue. Finally, it is demonstrated that CLX-PLGA MPs have an effect on inhibiting the osteogenic differentiation of bone marrow mesenchymal stem cells and have the potential to inhibit ectopic bone formation of the THO model in Sprague-Dawley rat. Therefore, this study suggests that CLX-PLGA MPs are expected to be applied topically in the early post-traumatic period to prevent the development of THO.
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Affiliation(s)
- Jialiang Lin
- The Third Clinical Medical College of Southern Medical University, Guangzhou, China
| | - Junchao Huang
- Medical College of Anhui University of Science and Technology, Huainan, China
| | - Jiang Wu
- Tinglin Hospital of Jinshan District, Shanghai, China
| | - Bo Tang
- The Third Clinical Medical College of Southern Medical University, Guangzhou, China
| | - Congbin Li
- Medical College of Anhui University of Science and Technology, Huainan, China
| | - Haijun Xiao
- Affiliated Fengxian Hospital to Southern Medical University, Shanghai, China
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8
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Kanungo M, Wang Y, Hutchinson N, Kroll E, DeBruine A, Kumpaty S, Ren L, Wu Y, Hua X, Zhang W. Development of Gelatin-Coated Microspheres for Novel Bioink Design. Polymers (Basel) 2021; 13:3339. [PMID: 34641153 PMCID: PMC8512326 DOI: 10.3390/polym13193339] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2021] [Revised: 09/24/2021] [Accepted: 09/25/2021] [Indexed: 02/07/2023] Open
Abstract
A major challenge in tissue engineering is the formation of vasculature in tissue and organs. Recent studies have shown that positively charged microspheres promote vascularization, while also supporting the controlled release of bioactive molecules. This study investigated the development of gelatin-coated pectin microspheres for incorporation into a novel bioink. Electrospray was used to produce the microspheres. The process was optimized using Design-Expert® software. Microspheres underwent gelatin coating and EDC catalysis modifications. The results showed that the concentration of pectin solution impacted roundness and uniformity primarily, while flow rate affected size most significantly. The optimal gelatin concentration for microsphere coating was determined to be 0.75%, and gelatin coating led to a positively charged surface. When incorporated into bioink, the microspheres did not significantly alter viscosity, and they distributed evenly in bioink. These microspheres show great promise for incorporation into bioink for tissue engineering applications.
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Affiliation(s)
- Muskan Kanungo
- Biomolecular Engineering Program, Physics and Chemistry Department, Milwaukee School of Engineering, Milwaukee, WI 53202, USA; (M.K.); (E.K.); (A.D.)
| | - Yale Wang
- Mechanical Engineering Department, University of Wisconsin-Milwaukee, Milwaukee, WI 53211, USA;
| | - Noah Hutchinson
- Biomedical Engineering Program, Electrical Engineering and Computer Science Department, Milwaukee School of Engineering, Milwaukee, WI 53202, USA;
| | - Emma Kroll
- Biomolecular Engineering Program, Physics and Chemistry Department, Milwaukee School of Engineering, Milwaukee, WI 53202, USA; (M.K.); (E.K.); (A.D.)
| | - Anna DeBruine
- Biomolecular Engineering Program, Physics and Chemistry Department, Milwaukee School of Engineering, Milwaukee, WI 53202, USA; (M.K.); (E.K.); (A.D.)
| | - Subha Kumpaty
- Mechanical Engineering Program Department, Milwaukee School of Engineering, Milwaukee, WI 53202, USA;
| | - Lixia Ren
- School of Material Science and Engineering, Tianjin University, Tianjin 300072, China;
| | - Yuelin Wu
- Department of Obstetrics, Shanghai First Maternity and Infant Hospital, Tongji University School of Medicine, Shanghai 201204, China;
| | - Xiaolin Hua
- Department of Obstetrics, Shanghai First Maternity and Infant Hospital, Tongji University School of Medicine, Shanghai 201204, China;
| | - Wujie Zhang
- Biomolecular Engineering Program, Physics and Chemistry Department, Milwaukee School of Engineering, Milwaukee, WI 53202, USA; (M.K.); (E.K.); (A.D.)
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9
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Wang Y, Huang W, Wang N, Ouyang D, Xiao L, Zhang S, Ou X, He T, Yu R, Song L. Development of Arteannuin B Sustained-Release Microspheres for Anti-Tumor Therapy by Integrated Experimental and Molecular Modeling Approaches. Pharmaceutics 2021; 13:1236. [PMID: 34452197 PMCID: PMC8399913 DOI: 10.3390/pharmaceutics13081236] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2021] [Revised: 07/30/2021] [Accepted: 08/06/2021] [Indexed: 11/26/2022] Open
Abstract
Arteannuin B (AB) has been found to demonstrate obvious anti-tumor activity. However, AB is not available for clinical use due to its very low solubility and very short half-life. This study aimed to develop AB long sustained-release microspheres (ABMs) to improve the feasibility of clinical applications. Firstly, AB-polylactic-co-glycolic acid (PLGA) microspheres were prepared by a single emulsification method. In vitro characterization studies showed that ABMs had a low burst release and stable in vitro release for up to one week. The particle size of microspheres was 69.10 μm (D50). The drug loading is 37.8%, and the encapsulation rate is 85%. Moreover, molecular dynamics modeling was firstly used to simulate the preparation process of microspheres, which clearly indicated the molecular image of microspheres and provided in-depth insights for understanding several key preparation parameters. Next, in vivo pharmacokinetics (PK) study was carried out to evaluate its sustained release effect in Sprague-Dawley (SD) rats. Subsequently, the methyl thiazolyl tetrazolium (MTT) method with human lung cancer cells (A549) was used to evaluate the in vitro efficacy of ABMs, which showed the IC50 of ABMs (3.82 μM) to be lower than that of AB (16.03 μM) at day four. Finally, in vivo anti-tumor activity and basic toxicity studies were performed on BALB/c nude mice by subcutaneous injection once a week, four times in total. The relative tumor proliferation rate T/C of AMBs was lower than 40% and lasted for 21 days after administration. The organ index, organ staining, and tumor cell staining indicated the excellent safety of ABMs than Cis-platinum. In summary, the ABMs were successfully developed and evaluated with a low burst release and a stable release within a week. Molecular dynamics modeling was firstly applied to investigate the molecular mechanism of the microsphere preparation. Moreover, the ABMs possess excellent in vitro and in vivo anti-tumor activity and low toxicity, showing great potential for clinical applications.
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Affiliation(s)
- Yanqing Wang
- Biotechnological Institute of Chinese Materia Medica, Jinan University, Guangzhou 510632, China; (Y.W.); (S.Z.)
| | - Weijuan Huang
- Department of Pharmacology, College of Pharmacy, Jinan University, Guangzhou 510632, China; (W.H.); (X.O.); (T.H.)
| | - Nannan Wang
- State Key Laboratory of Quality Research in Chinese Medicine, Institute of Chinese Medical Sciences (ICMS), University of Macau, Macau, China; (N.W.); (D.O.)
| | - Defang Ouyang
- State Key Laboratory of Quality Research in Chinese Medicine, Institute of Chinese Medical Sciences (ICMS), University of Macau, Macau, China; (N.W.); (D.O.)
| | - Lifeng Xiao
- Zhuhai Livzon Microsphere Technology Co., Ltd., Zhuhai 519090, China;
| | - Sirui Zhang
- Biotechnological Institute of Chinese Materia Medica, Jinan University, Guangzhou 510632, China; (Y.W.); (S.Z.)
| | - Xiaozheng Ou
- Department of Pharmacology, College of Pharmacy, Jinan University, Guangzhou 510632, China; (W.H.); (X.O.); (T.H.)
| | - Tingsha He
- Department of Pharmacology, College of Pharmacy, Jinan University, Guangzhou 510632, China; (W.H.); (X.O.); (T.H.)
| | - Rongmin Yu
- Biotechnological Institute of Chinese Materia Medica, Jinan University, Guangzhou 510632, China; (Y.W.); (S.Z.)
| | - Liyan Song
- Department of Pharmacology, College of Pharmacy, Jinan University, Guangzhou 510632, China; (W.H.); (X.O.); (T.H.)
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10
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Cun D, Zhang C, Bera H, Yang M. Particle engineering principles and technologies for pharmaceutical biologics. Adv Drug Deliv Rev 2021; 174:140-167. [PMID: 33845039 DOI: 10.1016/j.addr.2021.04.006] [Citation(s) in RCA: 25] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2020] [Revised: 03/21/2021] [Accepted: 04/06/2021] [Indexed: 12/12/2022]
Abstract
The global market of pharmaceutical biologics has expanded significantly during the last few decades. Currently, pharmaceutical biologic products constitute an indispensable part of the modern medicines. Most pharmaceutical biologic products are injections either in the forms of solutions or lyophilized powders because of their low oral bioavailability. There are certain pharmaceutical biologic entities formulated into particulate delivery systems for the administration via non-invasive routes or to achieve prolonged pharmaceutical actions to reduce the frequency of injections. It has been well documented that the design of nano- and microparticles via various particle engineering technologies could render pharmaceutical biologics with certain benefits including improved stability, enhanced intracellular uptake, prolonged pharmacological effect, enhanced bioavailability, reduced side effects, and improved patient compliance. Herein, we review the principles of the particle engineering technologies based on bottom-up approach and present the important formulation and process parameters that influence the critical quality attributes with some mathematical models. Subsequently, various nano- and microparticle engineering technologies used to formulate or process pharmaceutical biologic entities are reviewed. Lastly, an array of commercialized products of pharmaceutical biologics accomplished based on various particle engineering technologies are presented and the challenges in the development of particulate delivery systems for pharmaceutical biologics are discussed.
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Affiliation(s)
- Dongmei Cun
- Wuya College of Innovation, Shenyang Pharmaceutical University, Wenhua Road No. 103, 110016 Shenyang, China
| | - Chengqian Zhang
- Department of Pharmacy, Faculty of Health and Medical Sciences, University of Copenhagen, Universitetsparken 2, DK-2100 Copenhagen, Denmark
| | - Hriday Bera
- Wuya College of Innovation, Shenyang Pharmaceutical University, Wenhua Road No. 103, 110016 Shenyang, China
| | - Mingshi Yang
- Wuya College of Innovation, Shenyang Pharmaceutical University, Wenhua Road No. 103, 110016 Shenyang, China; Department of Pharmacy, Faculty of Health and Medical Sciences, University of Copenhagen, Universitetsparken 2, DK-2100 Copenhagen, Denmark.
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11
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Su Y, Zhang B, Sun R, Liu W, Zhu Q, Zhang X, Wang R, Chen C. PLGA-based biodegradable microspheres in drug delivery: recent advances in research and application. Drug Deliv 2021; 28:1397-1418. [PMID: 34184949 PMCID: PMC8248937 DOI: 10.1080/10717544.2021.1938756] [Citation(s) in RCA: 161] [Impact Index Per Article: 53.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
Biodegradable microspheres have been widely used in the field of medicine due to their ability to deliver drug molecules of various properties through multiple pathways and their advantages of low dose and low side effects. Poly (lactic-co-glycolic acid) copolymer (PLGA) is one of the most widely used biodegradable material currently and has good biocompatibility. In application, PLGA with a specific monomer ratio (lactic acid and glycolic acid) can be selected according to the properties of drug molecules and the requirements of the drug release rate. PLGA-based biodegradable microspheres have been studied in the field of drug delivery, including the delivery of various anticancer drugs, protein or peptide drugs, bacterial or viral DNA, etc. This review describes the basic knowledge and current situation of PLGA biodegradable microspheres and discusses the selection of PLGA polymer materials. Then, the preparation methods of PLGA microspheres are introduced, including emulsification, microfluidic technology, electrospray, and spray drying. Finally, this review summarizes the application of PLGA microspheres in drug delivery and the treatment of pulmonary and ocular-related diseases.
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Affiliation(s)
- Yue Su
- Xiangya School of Pharmaceutical Sciences, Central South University, Changsha, China
| | - Bolun Zhang
- Hunan Zaochen Nanorobot Co., Ltd, Liuyang, China
| | - Ruowei Sun
- Hunan Zaochen Nanorobot Co., Ltd, Liuyang, China
| | - Wenfang Liu
- Xiangya School of Pharmaceutical Sciences, Central South University, Changsha, China
| | - Qubo Zhu
- Xiangya School of Pharmaceutical Sciences, Central South University, Changsha, China
| | - Xun Zhang
- Hunan Zaochen Nanorobot Co., Ltd, Liuyang, China
| | | | - Chuanpin Chen
- Xiangya School of Pharmaceutical Sciences, Central South University, Changsha, China
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12
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Kwan V, O’Dwyer R, Laur D, Tan J, Consta S. Relation between Ejection Mechanism and Ion Abundance in the Electric Double Layer of Droplets. J Phys Chem A 2021; 125:2954-2966. [DOI: 10.1021/acs.jpca.1c01522] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Victor Kwan
- Department of Chemistry, The University of Western Ontario, London, Ontario N6A 5B7, Canada
| | - Ryan O’Dwyer
- Department of Chemistry, The University of Western Ontario, London, Ontario N6A 5B7, Canada
| | - David Laur
- Department of Chemistry, The University of Western Ontario, London, Ontario N6A 5B7, Canada
| | - Jiahua Tan
- Department of Chemistry, The University of Western Ontario, London, Ontario N6A 5B7, Canada
- College of Chemistry, Nankai University, Tianjin 300071, P. R. China
| | - Styliani Consta
- Department of Chemistry, The University of Western Ontario, London, Ontario N6A 5B7, Canada
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13
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Zhang C, Yang L, Wan F, Bera H, Cun D, Rantanen J, Yang M. Quality by design thinking in the development of long-acting injectable PLGA/PLA-based microspheres for peptide and protein drug delivery. Int J Pharm 2020; 585:119441. [PMID: 32442645 DOI: 10.1016/j.ijpharm.2020.119441] [Citation(s) in RCA: 45] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2019] [Revised: 05/13/2020] [Accepted: 05/14/2020] [Indexed: 12/20/2022]
Abstract
Adopting the Quality by Design (QbD) approach in the drug development process has transformed from "nice-to-do" into a crucial and required part of the development, ensuring the quality of pharmaceutical products throughout their whole life cycles. This review is discussing the implementation of the QbD thinking into the production of long-acting injectable (LAI) PLGA/PLA-based microspheres for the therapeutic peptide and protein drug delivery. Various key elements of the QbD approaches are initially elaborated using Bydureon®, a commercial product of LAI PLGA/PLA-based microspheres, as a classical example. Subsequently, the factors influencing the release patterns and the stability of the peptide and protein drugs are discussed. This is followed by a summary of the state-of-the-art of manufacturing LAI PLGA/PLA-based microspheres and the related critical process parameters (CPPs). Finally, a landscape of generic product development of LAI PLGA/PLA-based microspheres is reviewed including some major challenges in the field.
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Affiliation(s)
- Chengqian Zhang
- Wuya College of Innovation, Shenyang Pharmaceutical University, Wenhua Road 103, 110016 Shenyang, China
| | - Liang Yang
- CSPC ZhongQi Pharmaceutical Technology (Shijiazhuang) Company, Ltd, Huanghe Road 226, 050035 Shijiazhuang, China
| | - Feng Wan
- Department of Pharmacy, Faculty of Health and Medical Sciences, University of Copenhagen, Universitetsparken 2, 2100 Copenhagen, Denmark
| | - Hriday Bera
- Wuya College of Innovation, Shenyang Pharmaceutical University, Wenhua Road 103, 110016 Shenyang, China
| | - Dongmei Cun
- Wuya College of Innovation, Shenyang Pharmaceutical University, Wenhua Road 103, 110016 Shenyang, China
| | - Jukka Rantanen
- Department of Pharmacy, Faculty of Health and Medical Sciences, University of Copenhagen, Universitetsparken 2, 2100 Copenhagen, Denmark
| | - Mingshi Yang
- Wuya College of Innovation, Shenyang Pharmaceutical University, Wenhua Road 103, 110016 Shenyang, China; Department of Pharmacy, Faculty of Health and Medical Sciences, University of Copenhagen, Universitetsparken 2, 2100 Copenhagen, Denmark.
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Nogueira JCF, Paliashvili K, Bradford A, Di Maggio F, Richards DA, Day RM, Chudasama V. Functionalised thermally induced phase separation (TIPS) microparticles enabled for "click" chemistry. Org Biomol Chem 2020; 18:2215-2218. [PMID: 32150198 PMCID: PMC7362741 DOI: 10.1039/d0ob00106f] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2020] [Accepted: 03/02/2020] [Indexed: 12/23/2022]
Abstract
Due to their homogeneity, tuneable properties, low cost and ease of manufacture, thermally induced phase separation (TIPS) polymeric microparticles are emerging as an exciting class of injectable device for the treatment of damaged tissue or complex diseases, such as cancer. However, relatively little work has explored enhancing surface functionalisation of this system. Herein, we present the functionalisation of TIPS microparticles with both small molecules and an antibody fragment of Herceptin™, via a heterobifunctional pyridazinedione linker capable of participating in SPAAC "click" chemistry, and compare it to the traditional method of preparing active-targeted microparticle systems, that is, physisorption of antibodies to the microparticle surface. Antigen-binding assays demonstrated that functionalisation of microparticles with Herceptin Fab, via a pyridazinedione linker, provided an enhanced avidity to HER2+ when compared to traditional physisorption methods.
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Affiliation(s)
- João C F Nogueira
- UCL Chemistry Department, University College London, Gower Street, London, WC1E 6BT, UK.
| | - Ketevan Paliashvili
- Centre for Precision Healthcare, UCL Division of Medicine, University College London, Gower Street, London, WC1E 6BT, UK.
| | - Alexandra Bradford
- Centre for Precision Healthcare, UCL Division of Medicine, University College London, Gower Street, London, WC1E 6BT, UK.
| | - Francesco Di Maggio
- Centre for Precision Healthcare, UCL Division of Medicine, University College London, Gower Street, London, WC1E 6BT, UK.
| | - Daniel A Richards
- UCL Chemistry Department, University College London, Gower Street, London, WC1E 6BT, UK.
| | - Richard M Day
- Centre for Precision Healthcare, UCL Division of Medicine, University College London, Gower Street, London, WC1E 6BT, UK. and The Discoveries Centre for Regenerative and Precision Medicine, University College London, Gower Street, London, WC1E 6BT, UK
| | - Vijay Chudasama
- UCL Chemistry Department, University College London, Gower Street, London, WC1E 6BT, UK.
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15
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Li XX, Liu Y, He LF, Gao YY, Mu W, Zhang P, Li BX, Liu F. Fungicide Formulations Influence Their Control Efficacy by Mediating Physicochemical Properties of Spray Dilutions and Their Interaction with Target Leaves. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2020; 68:1198-1206. [PMID: 31928001 DOI: 10.1021/acs.jafc.9b05141] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
In this study, three types of pyraclostrobin formulations (including emulsifiable concentrate (EC), suspension concentrate (SC), and microcapsules (MCs)) were used to control cucumber anthracnose. Pyraclostrobin EC had the highest inhibitory activity against Colletotrichum orbiculare in vitro. Much different from the bioactivity in vitro, pyraclostrobin MCs exhibited the highest control efficacy on cucumber anthracnose both in pot and field experiments. The physicochemical properties (particle size, surface tension) of the spray dilution, their interaction with target leaves (contact angle, adhesional tension, work of adhesion, retention, crystallization) and dissipation dynamic of the active ingredient were found to be highly potential factors that would significantly influence the control efficacy of pesticide formulations. Results showed that the control efficacies of different formulations of pyraclostrobin were determined mainly by the final behavior of the pesticides at the target interface, namely, the retention, crystallization, and dissipation dynamics of active ingredients. This study had revealed crucial factors that would influence the efficacy of different formulations of pyraclostrobin and thus could guide the rational and efficient use of different formulations of pesticides on target crops.
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Affiliation(s)
- Xiao-Xu Li
- Key Laboratory of Pesticide Toxicology & Application Technique, College of Plant Protection , Shandong Agricultural University , Tai'an , Shandong 271018 , P. R. China
| | - Yang Liu
- Key Laboratory of Pesticide Toxicology & Application Technique, College of Plant Protection , Shandong Agricultural University , Tai'an , Shandong 271018 , P. R. China
| | - Li-Fei He
- Key Laboratory of Pesticide Toxicology & Application Technique, College of Plant Protection , Shandong Agricultural University , Tai'an , Shandong 271018 , P. R. China
| | - Yang-Yang Gao
- Key Laboratory of Pesticide Toxicology & Application Technique, College of Plant Protection , Shandong Agricultural University , Tai'an , Shandong 271018 , P. R. China
| | - Wei Mu
- Key Laboratory of Pesticide Toxicology & Application Technique, College of Plant Protection , Shandong Agricultural University , Tai'an , Shandong 271018 , P. R. China
- Research Center of Pesticide Environmental Toxicology , Shandong Agricultural University , Tai'an , Shandong 271018 , China
| | - Peng Zhang
- College of Environmental Science and Engineering , Nankai University , Tianjin 300350 , China
| | - Bei-Xing Li
- Key Laboratory of Pesticide Toxicology & Application Technique, College of Plant Protection , Shandong Agricultural University , Tai'an , Shandong 271018 , P. R. China
- Research Center of Pesticide Environmental Toxicology , Shandong Agricultural University , Tai'an , Shandong 271018 , China
| | - Feng Liu
- Key Laboratory of Pesticide Toxicology & Application Technique, College of Plant Protection , Shandong Agricultural University , Tai'an , Shandong 271018 , P. R. China
- Shandong Provincial Key Laboratory for Biology of Vegetable Diseases and Insect Pests, College of Plant Protection , Shandong Agricultural University , Tai'an , Shandong 271018 , P. R. China
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16
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Oh MI, Consta S. General solvation motifs of a charged linear macroion in an aqueous droplet. Mol Phys 2019. [DOI: 10.1080/00268976.2019.1596326] [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)
- Myong In Oh
- Department of Chemistry, The University of Western Ontario, London, Ontario, Canada
| | - Styliani Consta
- Department of Chemistry, The University of Western Ontario, London, Ontario, Canada
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Kwan V, Malevanets A, Consta S. Where Do the Ions Reside in a Highly Charged Droplet? J Phys Chem A 2019; 123:9298-9310. [DOI: 10.1021/acs.jpca.9b03368] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Victor Kwan
- Department of Chemistry, The University of Western Ontario, London N6A 5B7, Ontario, Canada
| | - Anatoly Malevanets
- Department of Electrical and Computer Engineering, The University of Western Ontario, London N6A 5B9, Ontario, Canada
| | - Styliani Consta
- Department of Chemistry, The University of Western Ontario, London N6A 5B7, Ontario, Canada
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18
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Liu G, Li Y, Yang S, Zhao Y, Lu T, Jia W, Ji X, Luo Y. DOPA-IGF-1 Coated HA/PLGA Microspheres Promoting Proliferation and Osteoclastic Differentiation of Rabbit Bone Mesenchymal Stem Cells. Chem Res Chin Univ 2019. [DOI: 10.1007/s40242-019-9007-7] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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19
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Emulsion Techniques for the Production of Pharmacological Nanoparticles. Macromol Biosci 2019; 19:e1900063. [DOI: 10.1002/mabi.201900063] [Citation(s) in RCA: 35] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2019] [Revised: 04/10/2019] [Indexed: 12/13/2022]
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20
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An Orthogonal Model to Study the Effect of Electrospraying Parameters on the Morphology of poly (d,l)-lactide-co-glycolide (PLGA) Particles. APPLIED SCIENCES-BASEL 2019. [DOI: 10.3390/app9061077] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Electrospraying has been recognized as an important technique for the production of microparticles for pharmaceutical applications. Nevertheless, the produce of poly (d,l)-lactide-co-glycolide (PLGA) microspheres with a desired size distribution remains a challenge. We conducted an empirical study, based on a fractional orthogonal design, to optimize the size distribution of electrosprayed particles. The influence of different processing factors, including PLGA concentration in the solution, volumetric flow rate of the solution, travel distance between the needle tip and the collection, voltage applied to the polymer solution, size of the needle, and type of solvent on the electrospraying of polymeric microparticles was investigated. After electrospraying, the size distribution of the PLGA particles was characterized and analyzed. Among the selected factors, the type of solvent used was the principal factor affecting the particle size of electrosprayed microspheres. Hexafluoro-2-propanol (HFIP) electrosprayed microparticles with the smallest diameter. However, hollowed particles could be seen among these microspheres. Dichloromethane (DCM) was found to electrospray microspheres with a fairly spherical geometry, while trichloromethane (TCM) electrosprayed particles with relatively rougher surfaces. Finally, the particle size of sprayed microspheres decreases somewhat with the polymer concentration and travel distance.
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21
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Lee PW, Pokorski JK. Poly(lactic-co-glycolic acid) devices: Production and applications for sustained protein delivery. WILEY INTERDISCIPLINARY REVIEWS. NANOMEDICINE AND NANOBIOTECHNOLOGY 2018; 10:e1516. [PMID: 29536634 PMCID: PMC6136991 DOI: 10.1002/wnan.1516] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/14/2017] [Revised: 01/30/2018] [Accepted: 02/14/2018] [Indexed: 12/12/2022]
Abstract
Injectable or implantable poly(lactic-co-glycolic acid) (PLGA) devices for the sustained delivery of proteins have been widely studied and utilized to overcome the necessity of repeated administrations for therapeutic proteins due to poor pharmacokinetic profiles of macromolecular therapies. These devices can come in the form of microparticles, implants, or patches depending on the disease state and route of administration. Furthermore, the release rate can be tuned from weeks to months by controlling the polymer composition, geometry of the device, or introducing additives during device fabrication. Slow-release devices have become a very powerful tool for modern medicine. Production of these devices has initially focused on emulsion-based methods, relying on phase separation to encapsulate proteins within polymeric microparticles. Process parameters and the effect of additives have been thoroughly researched to ensure protein stability during device manufacturing and to control the release profile. Continuous fluidic production methods have also been utilized to create protein-laden PLGA devices through spray drying and electrospray production. Thermal processing of PLGA with solid proteins is an emerging production method that allows for continuous, high-throughput manufacturing of PLGA/protein devices. Overall, polymeric materials for protein delivery remain an emerging field of research for the creation of single administration treatments for a wide variety of disease. This review describes, in detail, methods to make PLGA devices, comparing traditional emulsion-based methods to emerging methods to fabricate protein-laden devices. This article is categorized under: Biology-Inspired Nanomaterials > Protein and Virus-Based Structures Implantable Materials and Surgical Technologies > Nanomaterials and Implants Biology-Inspired Nanomaterials > Peptide-Based Structures.
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Affiliation(s)
- Parker W. Lee
- Department of Macromolecular Science and Engineering, School of Engineering, Case Western Reserve University, Cleveland, Ohio 44106, United States
| | - Jonathan K. Pokorski
- Department of Macromolecular Science and Engineering, School of Engineering, Case Western Reserve University, Cleveland, Ohio 44106, United States
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22
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Pawar A, Thakkar S, Misra M. A bird's eye view of nanoparticles prepared by electrospraying: advancements in drug delivery field. J Control Release 2018; 286:179-200. [DOI: 10.1016/j.jconrel.2018.07.036] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2018] [Revised: 07/22/2018] [Accepted: 07/23/2018] [Indexed: 01/19/2023]
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23
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Hsu YH, Chen DWC, Li MJ, Yu YH, Chou YC, Liu SJ. Sustained Delivery of Analgesic and Antimicrobial Agents to Knee Joint by Direct Injections of Electrosprayed Multipharmaceutical-Loaded Nano/Microparticles. Polymers (Basel) 2018; 10:polym10080890. [PMID: 30960815 PMCID: PMC6403761 DOI: 10.3390/polym10080890] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2018] [Revised: 08/04/2018] [Accepted: 08/07/2018] [Indexed: 11/23/2022] Open
Abstract
In this study, we developed biodegradable lidocaine–/vancomycin–/ceftazidime–eluting poly(d,l–lactide–co–glycolide) (PLGA) nano/microparticulate carriers using an electrospraying process, and we evaluated the release behaviors of the carriers in knee joints. To prepare the particles, predetermined weight percentages of PLGA, vancomycin, ceftazidime, and lidocaine were dissolved in solvents. The PLGA/antibiotic/lidocaine solutions were then fed into a syringe for electrospraying. After electrospraying, the morphology of the sprayed nano/microparticles was elucidated by scanning electron microscopy (SEM). The in vitro antibiotic/analgesic release characteristics of the nano/microparticles were studied using high-performance liquid chromatography (HPLC). In addition, drug release to the synovial tissues and fluids was studied in vivo by injecting drug-loaded nano/microparticles into the knee joints of rabbits. The biodegradable electrosprayed nano/microparticles released high concentrations of vancomycin/ceftazidime (well above the minimum inhibition concentration) and lidocaine into the knee joints for more than 2 weeks and for over 3 days, respectively. Such results suggest that electrosprayed biodegradable nano/microcarriers could be used for the long-term local delivery of various pharmaceuticals.
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Affiliation(s)
- Yung-Heng Hsu
- Department of Orthopedic Surgery, Chang Gung Memorial Hospital-Linkou, Tao-Yuan 33305, Taiwan.
- Department of Mechanical Engineering, Chang Gung University, Tao-Yuan 33302, Taiwan.
| | - Dave Wei-Chih Chen
- Department of Orthopedic Surgery, Chang Gung Memorial Hospital-Keelung, Keelung 20401, Taiwan.
| | - Min-Jhan Li
- Department of Mechanical Engineering, Chang Gung University, Tao-Yuan 33302, Taiwan.
| | - Yi-Hsun Yu
- Department of Orthopedic Surgery, Chang Gung Memorial Hospital-Linkou, Tao-Yuan 33305, Taiwan.
- Department of Mechanical Engineering, Chang Gung University, Tao-Yuan 33302, Taiwan.
| | - Ying-Chao Chou
- Department of Orthopedic Surgery, Chang Gung Memorial Hospital-Linkou, Tao-Yuan 33305, Taiwan.
- Department of Mechanical Engineering, Chang Gung University, Tao-Yuan 33302, Taiwan.
| | - Shih-Jung Liu
- Department of Orthopedic Surgery, Chang Gung Memorial Hospital-Linkou, Tao-Yuan 33305, Taiwan.
- Department of Mechanical Engineering, Chang Gung University, Tao-Yuan 33302, Taiwan.
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24
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Stubelius A, Sheng W, Lee S, Olejniczak J, Guma M, Almutairi A. Disease-Triggered Drug Release Effectively Prevents Acute Inflammatory Flare-Ups, Achieving Reduced Dosing. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2018; 14:e1800703. [PMID: 30009516 PMCID: PMC6165597 DOI: 10.1002/smll.201800703] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/20/2018] [Revised: 05/01/2018] [Indexed: 06/08/2023]
Abstract
For conditions with inflammatory flare-ups, fast drug-release from a depot is crucial to reduce cell infiltration and prevent long-term tissue destruction. While this concept has been explored for chronic diseases, preventing acute inflammatory flares has not been explored. To address this issue, a preventative inflammation-sensitive system is developed and applied to acute gout, a condition where millions of inflammatory cells are recruited rapidly, causing excruciating and debilitating pain. Rapid drug release is first demonstrated from a pH-responsive acetalated dextran particle loaded with dexamethasone (AcDex-DXM), reducing proinflammatory cytokines in vitro as efficiently as free drug. Then, using the air pouch model of gout, mice are pretreated 24 h before inducing inflammation. AcDex-DXM reduces overall cell infiltration with decreased neutrophils, increases monocytes, and diminishes cytokines and chemokines. In a more extended prophylaxis model, murine joints are pretreated eight days before initiating inflammation. After quantifying cell infiltration, only AcDex-DXM reduces the overall joint inflammation, where neither free drug nor a conventional drug-depot achieves adequate anti-inflammatory effects. Here, the superior efficacy of disease-triggered drug-delivery to prevent acute inflammation is demonstrated over free drug and slow-release depots. This approach and results promise exciting treatment opportunities for multiple inflammatory conditions suffering from acute flares.
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Affiliation(s)
- Alexandra Stubelius
- Center of Excellence in Nanomedicine, Skaggs School of Pharmacy and Pharmaceutical Sciences, Departments of NanoEngineering and Materials Science and Engineering, University of California, San Diego, La Jolla, CA, 92093, USA
| | - Wangzhong Sheng
- Center of Excellence in Nanomedicine, Skaggs School of Pharmacy and Pharmaceutical Sciences, Departments of NanoEngineering and Materials Science and Engineering, University of California, San Diego, La Jolla, CA, 92093, USA
| | - Sangeun Lee
- Center of Excellence in Nanomedicine, Skaggs School of Pharmacy and Pharmaceutical Sciences, Departments of NanoEngineering and Materials Science and Engineering, University of California, San Diego, La Jolla, CA, 92093, USA
| | - Jason Olejniczak
- Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, CA, 92093, USA
| | - Monica Guma
- School of Medicine, University of California, San Diego, La Jolla, CA, 92093, USA
| | - Adah Almutairi
- Center of Excellence in Nanomedicine, Skaggs School of Pharmacy and Pharmaceutical Sciences, Departments of NanoEngineering and Materials Science and Engineering, University of California, San Diego, La Jolla, CA, 92093, USA
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25
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Zhao W, Liu W, Xu R, Wang Y, Jin K, Li H. Fabrication and characterization of dual drug-loaded poly (lactic-co-glycolic acid) fiber-microsphere composite scaffolds. INT J POLYM MATER PO 2018. [DOI: 10.1080/00914037.2018.1446139] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Affiliation(s)
- Wen Zhao
- Key Lab for Space Biosciences & Biotechnology, School of Life Sciences, Northwestern Polytechnical University, Xi’an, Shaanxi, P.R. China
| | - Wenlong Liu
- Key Lab for Space Biosciences & Biotechnology, School of Life Sciences, Northwestern Polytechnical University, Xi’an, Shaanxi, P.R. China
| | - Rui Xu
- Key Lab for Space Biosciences & Biotechnology, School of Life Sciences, Northwestern Polytechnical University, Xi’an, Shaanxi, P.R. China
| | - Yian Wang
- Key Lab for Space Biosciences & Biotechnology, School of Life Sciences, Northwestern Polytechnical University, Xi’an, Shaanxi, P.R. China
| | - Kaixiang Jin
- Key Lab for Space Biosciences & Biotechnology, School of Life Sciences, Northwestern Polytechnical University, Xi’an, Shaanxi, P.R. China
| | - Huichao Li
- Key Lab for Space Biosciences & Biotechnology, School of Life Sciences, Northwestern Polytechnical University, Xi’an, Shaanxi, P.R. China
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26
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In Oh M, Paliy M, Consta S. “Star” morphologies of charged nanodrops comprised of conformational isomers. J Chem Phys 2018; 148:024307. [DOI: 10.1063/1.5011989] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023] Open
Affiliation(s)
- Myong In Oh
- Department of Chemistry, The University of Western Ontario, London, Ontario N6A 5B7, Canada
| | - Maxim Paliy
- Department of Chemistry, The University of Western Ontario, London, Ontario N6A 5B7, Canada
| | - Styliani Consta
- Department of Chemistry, The University of Western Ontario, London, Ontario N6A 5B7, Canada
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27
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Oh MI, Malevanets A, Paliy M, Frenkel D, Consta S. When droplets become stars: charged dielectric droplets beyond the Rayleigh limit. SOFT MATTER 2017; 13:8781-8795. [PMID: 29139530 DOI: 10.1039/c7sm02017a] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
When a nano-drop comprising a single spherical central ion and dielectric solvent is charged above a well-defined threshold, it acquires a stable star morphology. In contrast, conducting droplets, will undergo fission. Here we report combined atomistic molecular dynamics and continuum modelling study of star formation of droplets that contain a highly charged ion. We assume that in the continuum model the dielectric response is linear. In this linear continuum model, which is an extension of Rayleigh model, the energy of the drop is comprised of terms analogous to those in Rayleigh model, which are surface energy and electrostatic energy of dielectric droplet charged by a central point charge. We present the stability analysis of the continuum model to determine the threshold of instability. Indeed we find that the model accounts well for the onset of the instabilities. Molecular dynamics show that the number of points of the star-shaped nano-drops depends only on the surface tension, dielectric constant and size of the droplet, and on the magnitude of the charge of the central ion, but not on its sign. Intuitively, it is expected that when a spherical dielectric drop becomes unstable it would transform into a non-spherical finite shape of the same volume as the initial spherical shape with the point charge located in the drop interior. To test whether the extended Rayleigh model can account for the observed droplet shapes, we performed numerical simulations of the linear continuum model. Contrary to the expectations, the simulations of the extended Rayleigh model does not reproduce the stable star shapes found in the atomistic simulations, not even when we account for the bending rigidity and spontaneous curvature of the surface. We argue that the assumption that the dielectric response is linear breaks down if the droplet surface approaches the central macro-ion, where the electric field strength is such that dielectric saturation sets in. We envisage that for certain solvents, these stars could be made permanent by cross-linking, opening the way to the production of a novel class of highly-non-convex colloids.
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Affiliation(s)
- Myong In Oh
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, UK.
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28
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Zhang M, Ma Y, Li R, Zeng J, Li Z, Tang Y, Sun D. RhBMP-2-loaded Poly(lactic-co-glycolic acid) microspheres fabricated by coaxial electrospraying for protein delivery. JOURNAL OF BIOMATERIALS SCIENCE-POLYMER EDITION 2017; 28:2205-2219. [PMID: 28988518 DOI: 10.1080/09205063.2017.1390381] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
In this study, we fabricated recombinant human bone morphogenetic protein-2 (rhBMP-2) loaded Poly(lactic-co-glycolic acid) (PLGA) microspheres with core-shell structures and particle sizes ranging from 2.5 to 8 μm by coaxial electrospraying. The manufacturing process of core-shell microspheres by coaxial electrospraying is simpler than that with other methods, and a smaller diameter can be obtained. The microspheres were analyzed by environmental scanning electron microscopy, transmission electron microscopy (TEM), and laser scanning confocal microscopy (LSCM). Moreover, the drug release profiles and degradation of rhBMP-2-loaded PLGA microspheres in vitro were investigated for 21 days and for 7 weeks, respectively. The rhBMP-2 was stabilized by using bovine serum albumin (BSA) to ensure protein activity in the electrospraying process. Fluorescently labeled protein that was loaded into the core-shell PLGA microspheres was verified by LSCM. The distinct layered structure that existed in the manufactured core-shell microspheres can be observed by TEM. Cell Counting Kit-8 (CCK-8) indicated that the core-shell PLGA microspheres loaded with rhBMP-2 have great potential for the treatment of bone defects, for bone regeneration, and in bone tissue engineering.
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Affiliation(s)
- Mei Zhang
- a Alan G. MacDiarmid Laboratory, College of Chemistry , Jilin University , Changchun , China
| | - Yali Ma
- a Alan G. MacDiarmid Laboratory, College of Chemistry , Jilin University , Changchun , China
| | - Rongjun Li
- b Norman Bethune First Hospital , Jilin University , Changchun , China
| | - Jiehui Zeng
- a Alan G. MacDiarmid Laboratory, College of Chemistry , Jilin University , Changchun , China
| | - Ziqi Li
- a Alan G. MacDiarmid Laboratory, College of Chemistry , Jilin University , Changchun , China
| | - Yajun Tang
- a Alan G. MacDiarmid Laboratory, College of Chemistry , Jilin University , Changchun , China
| | - Dahui Sun
- b Norman Bethune First Hospital , Jilin University , Changchun , China
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Guo Y, Yang Y, He L, Sun R, Pu C, Xie B, He H, Zhang Y, Yin T, Wang Y, Tang X. Injectable Sustained-Release Depots of PLGA Microspheres for Insoluble Drugs Prepared by hot-Melt Extrusion. Pharm Res 2017; 34:2211-2222. [PMID: 28741064 DOI: 10.1007/s11095-017-2228-x] [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: 05/08/2017] [Accepted: 07/03/2017] [Indexed: 11/29/2022]
Abstract
PURPOSE Progesterone (PRG) was selected as a model drug to develop a long-acting injection system for poorly water-soluble drugs. METHODS Microspheres with high density-low porosity were prepared by hot-melt extrusion (HME) combined with wet-milling as the representative formulation, and a microcrystal suspension was also studied as a comparison. The morphology, particle size and distribution, polymorphism, drug distribution, density and porosity were characterized by scanning electron microscopy, laser diffraction particle size analyzer, power X-ray diffraction and DSC respectively. The in vivo performance of the different formulations within 7 days after intramuscular injection was evaluated in male SD rats. RESULTS The drug-loading rate of the microspheres could be as high as 40%. The average initial burst release of the microspheres (PLGA lactide:glycolide = 75:25) was only 6.7% much lower than that of the microsuspension (25.7%) and a sustained release was exhibited for at least 7 days. The release mechanism was speculated to be as follows. The microspheres are a drug depot with drug microcrystals in the PLGA matrix which is a layer by layer honeycomb structure. CONCLUSIONS Microspheres prepared by HME combined with wet-milling could achieve a long-term sustained release effect as a novel long-acting formulation strategy.
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Affiliation(s)
- Yuting Guo
- School of Pharmacy, Shenyang Pharmaceutical University, 103 Wenhua Road, Shenyang, 110016, China
| | - Yunning Yang
- School of Pharmacy, Shenyang Pharmaceutical University, 103 Wenhua Road, Shenyang, 110016, China
| | - Luying He
- School of Pharmacy, Shenyang Pharmaceutical University, 103 Wenhua Road, Shenyang, 110016, China
| | - Rong Sun
- School of Pharmacy, Shenyang Pharmaceutical University, 103 Wenhua Road, Shenyang, 110016, China
| | - Chenguang Pu
- School of Pharmacy, Shenyang Pharmaceutical University, 103 Wenhua Road, Shenyang, 110016, China
| | - Bin Xie
- School of Pharmacy, Shenyang Pharmaceutical University, 103 Wenhua Road, Shenyang, 110016, China
| | - Haibing He
- School of Pharmacy, Shenyang Pharmaceutical University, 103 Wenhua Road, Shenyang, 110016, China
| | - Yu Zhang
- School of Pharmacy, Shenyang Pharmaceutical University, 103 Wenhua Road, Shenyang, 110016, China
| | - Tian Yin
- School of Functional food and Wine, Shenyang Pharmaceutical University, Shenyang, China.
| | - Yanjiao Wang
- School of Pharmacy, Shenyang Pharmaceutical University, 103 Wenhua Road, Shenyang, 110016, China.
| | - Xing Tang
- School of Pharmacy, Shenyang Pharmaceutical University, 103 Wenhua Road, Shenyang, 110016, China
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Smeets A, Clasen C, Van den Mooter G. Electrospraying of polymer solutions: Study of formulation and process parameters. Eur J Pharm Biopharm 2017; 119:114-124. [PMID: 28610878 DOI: 10.1016/j.ejpb.2017.06.010] [Citation(s) in RCA: 51] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2017] [Revised: 04/28/2017] [Accepted: 06/05/2017] [Indexed: 10/19/2022]
Abstract
Over the past decade, electrospraying has proven to be a promising method for the preparation of amorphous solid dispersions, an established formulation strategy to improve the oral bioavailability of poorly soluble drug compounds. Due to the lack of fundamental knowledge concerning adequate single nozzle electrospraying conditions, a trial-and-error approach is currently the only option. The objective of this paper is to study/investigate the influence of the different formulation and process parameters, as well as their interplay, on the formation of a stable cone-jet mode as a prerequisite for a reproducible production of monodisperse micro- and nanoparticles. To this purpose, different polymers commonly used in the formulation of solid dispersions were electrosprayed to map out the workable parameter ranges of the process. The experiments evaluate the importance of the experimental parameters as flow rate, electric potential difference and the distance between the tip of the nozzle and collector. Based on this, the type of solvent and the concentration of the polymer solutions, along with their viscosity and conductivity, were identified as determinative formulation parameters. This information is of utmost importance to rationally design further electrospraying methods for the preparation of amorphous solid dispersions.
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Affiliation(s)
- Annelies Smeets
- KU Leuven - University of Leuven, Department of Pharmaceutical and Pharmacological Sciences, Drug Delivery and Disposition, Leuven B-3000, Belgium
| | - Christian Clasen
- KU Leuven - University of Leuven, Department of Chemical Engineering, Leuven B-3001, Belgium
| | - Guy Van den Mooter
- KU Leuven - University of Leuven, Department of Pharmaceutical and Pharmacological Sciences, Drug Delivery and Disposition, Leuven B-3000, Belgium.
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31
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Takahashi C, Ueno K, Aoyama J, Adachi M, Yamamoto H. Imaging of intracellular behavior of polymeric nanoparticles in Staphylococcus epidermidis biofilms by slit-scanning confocal Raman microscopy and scanning electron microscopy with energy-dispersive X-ray spectroscopy. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2017; 76:1066-1074. [PMID: 28482470 DOI: 10.1016/j.msec.2017.03.132] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/21/2016] [Revised: 03/10/2017] [Accepted: 03/13/2017] [Indexed: 11/25/2022]
Abstract
In drug delivery systems employing polymeric nanoparticles, accurate delivery of drugs to target sites such as bacterial cells, cell tissues, and organelles is essential. In particular, when designing drug delivery systems for the treatment of the biofilm infections, evaluation of the interaction between polymeric nanoparticles and biofilm or bacterial cells using a simple technique is of significant importance. Here we develop two types of novel techniques for the biological imaging of the intracellular behavior of two types of polymeric nanoparticles, biodegradable chitosan-modified poly (dl-lactide-co-glycolide) (PLGA) nanoparticles and chitosan-modified polyvinyl caprolactam - polyvinyl acetate -polyethylene glycol graft copolymer (Soluplus®, Sol) nanoparticles, within a Staphylococcus epidermidis biofilm. As the first technique, Raman imaging of unstained biological materials using slit-scanning confocal Raman microscopy (unstained Raman imaging) was performed, and as the second, field-emission scanning electron microscopy with energy-dispersive X-ray spectroscopy analysis of biological materials labeled with quantum dots (SEM-QD imaging) was demonstrated. These analyses revealed differing localization of the respective nanoparticles within the biofilm in accordance with the specific interactions of PLGA nanoparticles and Sol nanoparticles with the biofilm. These novel techniques open the door to biological imaging and analyses with high spatial resolution, which will help to understand the efficacy of drug delivery to target materials.
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Affiliation(s)
- Chisato Takahashi
- Pharmaceutical Engineering, School of Pharmacy, Aichi Gakuin University, 1-100, Kusumoto-cho, Chikusa-ku, Nagoya, Aichi 464-8650, Japan.
| | - Kusuo Ueno
- HORIBA, Ltd., Miyanohigashi, Kisshoin, Minami-Ku, Kyoto, Kyoto 601-8510, Japan
| | - Junichi Aoyama
- HORIBA, Ltd., Miyanohigashi, Kisshoin, Minami-Ku, Kyoto, Kyoto 601-8510, Japan
| | - Mariko Adachi
- Nanophoton Corporation, 321 Photonics Center, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Hiromitsu Yamamoto
- Pharmaceutical Engineering, School of Pharmacy, Aichi Gakuin University, 1-100, Kusumoto-cho, Chikusa-ku, Nagoya, Aichi 464-8650, Japan
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32
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Awwad S, Day RM, Khaw PT, Brocchini S, Fadda HM. Sustained release ophthalmic dexamethasone: In vitro in vivo correlations derived from the PK-Eye. Int J Pharm 2017; 522:119-127. [PMID: 28232270 DOI: 10.1016/j.ijpharm.2017.02.047] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2016] [Revised: 02/02/2017] [Accepted: 02/17/2017] [Indexed: 12/21/2022]
Abstract
Corticosteroids have long been used to treat intraocular inflammation by intravitreal injection. We describe dexamethasone loaded poly-DL-lactide-co-glycolide (PLGA) microparticles that were fabricated by thermally induced phase separation (TIPS). The dexamethasone loaded microparticles were evaluated using a two-compartment, in vitro aqueous outflow model of the eye (PK-Eye) that estimates drug clearance time from the back of the eye via aqueous outflow by the anterior route. A dexamethasone dose of 0.20±0.02mg in a 50μL volume of TIPS microparticles resulted in a clearance t1/2 of 9.6±0.3days using simulated vitreous in the PK-Eye. Since corticosteroids can also clear through the retina, it is necessary to account for clearance through the back of the eye. Retinal permeability data, published human ocular pharmacokinetics (PK) and the PK-Eye clearance times were then used to establish in vitro in vivo correlations (IVIVCs) for intraocular clearance times of corticosteroid formulations. A t1/2 of 48h was estimated for the dexamethasone-TIPS microparticles, which is almost 9 times longer than that reported for dexamethasone suspension in humans. The prediction of human clearance times of permeable molecules from the vitreous compartment can be determined by accounting for drug retinal permeation and determining the experimental clearance via the anterior aqueous outflow pathway using the PK-Eye.
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Affiliation(s)
- Sahar Awwad
- National Institute for Health Research (NIHR) Biomedical Research Centre at Moorfields Eye Hospital NHS Foundation Trust and UCL Institute of Ophthalmology, London, EC1 V9EL, UK; UCL School of Pharmacy, London, WC1N 1AX, UK
| | | | - Peng T Khaw
- National Institute for Health Research (NIHR) Biomedical Research Centre at Moorfields Eye Hospital NHS Foundation Trust and UCL Institute of Ophthalmology, London, EC1 V9EL, UK
| | - Steve Brocchini
- National Institute for Health Research (NIHR) Biomedical Research Centre at Moorfields Eye Hospital NHS Foundation Trust and UCL Institute of Ophthalmology, London, EC1 V9EL, UK; UCL School of Pharmacy, London, WC1N 1AX, UK.
| | - Hala M Fadda
- Department of Pharmaceutical Sciences, College of Pharmacy and Health Sciences, Butler University, Indianapolis, IN 46208, USA.
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Wang L, Yang Q, Chen Y, Chai Y, Li JJ, Du L, Tan R, Yang S, Tu M, Yu B. A reformative shear precipitation procedure for the fabrication of vancomycin-loaded poly(lactide-co-glycolide) microspheres. J Biomater Appl 2017; 31:995-1009. [PMID: 28068861 DOI: 10.1177/0885328216689199] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
This study reports the encapsulation of vancomycin, as a model hydrophilic drug, into poly(lactide-co-glycolide) microspheres using a novel reformative shear precipitation procedure. In contrast to the external aqueous phase used in the conventional microencapsulation technique based on emulsion solvent evaporation/extraction, the reformative shear precipitation procedure explored in this study uses a shear medium composed of glycerol as the viscous medium and ethanol as polymer antisolvent, which is relatively immiscible with the hydrophilic drug. This limits drug diffusion and leads to rapid microsphere solidification, which allows a large proportion of the hydrophilic drug to be encapsulated within the microspheres. The influence of various processing parameters, including polymer concentration, volume ratio of ethanol to glycerol in the shear medium, volume of aqueous drug solution, initial drug loading, and injecting rate of the drug-polymer emulsion, on the encapsulation efficiency and characteristics of resulting microspheres were investigated. The morphology and release characteristics, as well as mechanical, in vitro and in vivo behaviour of vancomycin-loaded poly(lactide-co-glycolide) microspheres prepared using the novel procedure were also investigated. The results demonstrated that the reformative shear precipitation procedure could achieve the loading of hydrophilic drugs into poly(lactide-co-glycolide) microspheres with high encapsulation efficiency, and the success of the procedure was largely influenced by the volume ratio of ethanol to glycerol in the shear medium. Vancomycin-loaded poly(lactide-co-glycolide) microspheres prepared using this procedure demonstrated favourable mechanical characteristics, antibacterial activity, and in vivo degradation behaviour which suggested their suitability for use as a sustained delivery system.
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Affiliation(s)
- Lei Wang
- 1 Department of Orthopaedics and Traumatology, Nanfang Hospital, Southern Medical University, Guangzhou, People's Republic of China
| | - Qinmeng Yang
- 1 Department of Orthopaedics and Traumatology, Nanfang Hospital, Southern Medical University, Guangzhou, People's Republic of China
| | - Yirong Chen
- 1 Department of Orthopaedics and Traumatology, Nanfang Hospital, Southern Medical University, Guangzhou, People's Republic of China
| | - Yu Chai
- 1 Department of Orthopaedics and Traumatology, Nanfang Hospital, Southern Medical University, Guangzhou, People's Republic of China
| | - Jiao Jiao Li
- 2 Biomaterials and Tissue Engineering Research Unit, School of AMME, University of Sydney, Sydney, NSW, Australia
| | - Lin Du
- 3 Department of Materials Science and Engineering, College of Science and Engineering, Jinan University, Guangzhou, People's Republic of China
| | - Ruizhe Tan
- 3 Department of Materials Science and Engineering, College of Science and Engineering, Jinan University, Guangzhou, People's Republic of China
| | - Shenyu Yang
- 3 Department of Materials Science and Engineering, College of Science and Engineering, Jinan University, Guangzhou, People's Republic of China
| | - Mei Tu
- 3 Department of Materials Science and Engineering, College of Science and Engineering, Jinan University, Guangzhou, People's Republic of China
| | - Bin Yu
- 1 Department of Orthopaedics and Traumatology, Nanfang Hospital, Southern Medical University, Guangzhou, People's Republic of China
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34
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Letícia Braz A, Ahmed I. Manufacturing processes for polymeric micro and nanoparticles and their biomedical applications. AIMS BIOENGINEERING 2017. [DOI: 10.3934/bioeng.2017.1.46] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
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Yao S, Liu H, Yu S, Li Y, Wang X, Wang L. Drug-nanoencapsulated PLGA microspheres prepared by emulsion electrospray with controlled release behavior. Regen Biomater 2016; 3:309-317. [PMID: 27699061 PMCID: PMC5043157 DOI: 10.1093/rb/rbw033] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2016] [Revised: 08/19/2016] [Accepted: 08/20/2016] [Indexed: 11/14/2022] Open
Abstract
The development of modern therapeutics has raised the requirement for controlled drug delivery system which is able to efficiently encapsulate bioactive agents and achieve their release at a desired rate satisfying the need of the practical system. In this study, two kind of aqueous model drugs with different molecule weight, Congo red and albumin from bovine serum (BSA) were nano-encapsulated in poly (dl-lactic-co-glycolic acid) (PLGA) microspheres by emulsion electrospray. In the preparation process, the aqueous phase of drugs was added into the PLGA chloroform solution to form the emulsion solution. The emulsion was then electrosprayed to fabricate drug-nanoencapsulated PLGA microspheres. The morphology of the PLGA microspheres was affected by the volume ratio of aqueous drug phase and organic PLGA phase (Vw/Vo ) and the molecule weight of model drugs. Confocal laser scanning microcopy showed the nanodroplets of drug phase were scattered in the PLGA microspheres homogenously with different distribution patterns related to Vw/Vo . With the increase of the volume ratio of aqueous drug phase, the number of nanodroplets increased forming continuous phase gradually that could accelerate drug release rate. Moreover, BSA showed a slower release rate from PLGA microspheres comparing to Congo red, which indicated the drug release rate could be affected by not only Vw/Vo but also the molecule weight of model drug. In brief, the PLGA microspheres prepared using emulsion electrospray provided an efficient and simple system to achieve controlled drug release at a desired rate satisfying the need of the practices.
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Affiliation(s)
- Shenglian Yao
- School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China,; State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
| | - Huiying Liu
- Department of Oral and Maxillofacial Surgery, School of Stomatology, Dalian Medical University, Dalian 116044, China
| | - Shukui Yu
- Institute for Neuroscience, Capital Medical University, Beijing 100069, China
| | - Yuanyuan Li
- State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China,; Department of Oral and Maxillofacial Surgery, School of Stomatology, Dalian Medical University, Dalian 116044, China
| | - Xiumei Wang
- State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
| | - Luning Wang
- School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
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