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Li S, Zheng W, Deng W, Li Z, Yang J, Zhang H, Dai Z, Su W, Yan Z, Xue W, Yun X, Mi S, Shen J, Luo X, Wang L, Wu Y, Huang W. Logic-Based Strategy for Spatiotemporal Release of Dual Extracellular Vesicles in Osteoarthritis Treatment. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2024:e2403227. [PMID: 38704731 DOI: 10.1002/advs.202403227] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/30/2024] [Indexed: 05/07/2024]
Abstract
To effectively treat osteoarthritis (OA), the existing inflammation must be reduced before the cartilage damage can be repaired; this cannot be achieved with a single type of extracellular vesicles (EVs). Here, a hydrogel complex with logic-gates function is proposed that can spatiotemporally controlled release two types of EVs: interleukin 10 (IL-10)+ EVs to promote M2 polarization of macrophage, and SRY-box transcription factor 9 (SOX9)+ EVs to increase cartilage matrix synthesis. Following dose-of-action screening, the dual EVs are loaded into a matrix metalloporoteinase 13 (MMP13)-sensitive self-assembled peptide hydrogel (KM13E) and polyethylene glycol diacrylate/gelatin methacryloyl-hydrogel microspheres (PGE), respectively. These materials are mixed to form a "microspheres-in-gel" KM13E@PGE system. In vitro, KM13E@PGE abruptly released IL-10+ EVs after 3 days and slowly released SOX9+ EVs for more than 30 days. In vivo, KM13E@PGE increased the CD206+ M2 macrophage proportion in the synovial tissue and decreased the tumor necrosis factor-α and IL-1β levels. The aggrecan and SOX9 expressions in the cartilage tissues are significantly elevated following inflammation subsidence. This performance is not achieved using anti-inflammatory or cartilage repair therapy alone. The present study provides an injectable, integrated delivery system with spatiotemporal control release of dual EVs, and may inspire logic-gates strategies for OA treatment.
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Affiliation(s)
- Shiyu Li
- Guangdong Medical Innovation Platform for Translation of 3D Printing Application, The Third Affiliated Hospital of Southern Medical University, Southern Medical University, Guangzhou, 510630, China
- Guangdong Engineering Research Center for Translation of Medical 3D Printing Application, Guangdong Provincial Key Laboratory of Digital Medicine and Biomechanics, National Key Discipline of Human Anatomy, School of Basic Medical Sciences, Southern Medical University, Guangzhou, 510515, China
| | - Weihan Zheng
- Guangdong Medical Innovation Platform for Translation of 3D Printing Application, The Third Affiliated Hospital of Southern Medical University, Southern Medical University, Guangzhou, 510630, China
- Guangdong Engineering Research Center for Translation of Medical 3D Printing Application, Guangdong Provincial Key Laboratory of Digital Medicine and Biomechanics, National Key Discipline of Human Anatomy, School of Basic Medical Sciences, Southern Medical University, Guangzhou, 510515, China
| | - Wenfeng Deng
- Guangdong Medical Innovation Platform for Translation of 3D Printing Application, The Third Affiliated Hospital of Southern Medical University, Southern Medical University, Guangzhou, 510630, China
- Department of Obstetrics and Gynecology, The First Affiliated Hospital of Guangzhou Medical University, Guangzhou Medical University, Guangzhou, 510120, China
| | - Ziyue Li
- Guangdong Medical Innovation Platform for Translation of 3D Printing Application, The Third Affiliated Hospital of Southern Medical University, Southern Medical University, Guangzhou, 510630, China
- Guangdong Engineering Research Center for Translation of Medical 3D Printing Application, Guangdong Provincial Key Laboratory of Digital Medicine and Biomechanics, National Key Discipline of Human Anatomy, School of Basic Medical Sciences, Southern Medical University, Guangzhou, 510515, China
| | - Jiaxin Yang
- Guangdong Engineering Research Center for Translation of Medical 3D Printing Application, Guangdong Provincial Key Laboratory of Digital Medicine and Biomechanics, National Key Discipline of Human Anatomy, School of Basic Medical Sciences, Southern Medical University, Guangzhou, 510515, China
| | - Huihui Zhang
- Guangdong Engineering Research Center for Translation of Medical 3D Printing Application, Guangdong Provincial Key Laboratory of Digital Medicine and Biomechanics, National Key Discipline of Human Anatomy, School of Basic Medical Sciences, Southern Medical University, Guangzhou, 510515, China
- Department of Burns, Nanfang Hospital, Southern Medical University, Guangzhou, 510515, China
| | - Zhenning Dai
- Department of Stomatology, Guangdong Provincial Key Laboratory of Research and Development in Traditional Chinese Medicine, Guangdong Second Traditional Chinese Medicine Hospital, Guangzhou, 510095, China
| | - Weiwei Su
- Guangdong Medical Innovation Platform for Translation of 3D Printing Application, The Third Affiliated Hospital of Southern Medical University, Southern Medical University, Guangzhou, 510630, China
- Guangdong Engineering Research Center for Translation of Medical 3D Printing Application, Guangdong Provincial Key Laboratory of Digital Medicine and Biomechanics, National Key Discipline of Human Anatomy, School of Basic Medical Sciences, Southern Medical University, Guangzhou, 510515, China
| | - Zi Yan
- Guangdong Medical Innovation Platform for Translation of 3D Printing Application, The Third Affiliated Hospital of Southern Medical University, Southern Medical University, Guangzhou, 510630, China
- Guangdong Engineering Research Center for Translation of Medical 3D Printing Application, Guangdong Provincial Key Laboratory of Digital Medicine and Biomechanics, National Key Discipline of Human Anatomy, School of Basic Medical Sciences, Southern Medical University, Guangzhou, 510515, China
| | - Wanting Xue
- Guangdong Engineering Research Center for Translation of Medical 3D Printing Application, Guangdong Provincial Key Laboratory of Digital Medicine and Biomechanics, National Key Discipline of Human Anatomy, School of Basic Medical Sciences, Southern Medical University, Guangzhou, 510515, China
| | - Xinyi Yun
- Guangdong Engineering Research Center for Translation of Medical 3D Printing Application, Guangdong Provincial Key Laboratory of Digital Medicine and Biomechanics, National Key Discipline of Human Anatomy, School of Basic Medical Sciences, Southern Medical University, Guangzhou, 510515, China
| | - Siqi Mi
- Guangdong Engineering Research Center for Translation of Medical 3D Printing Application, Guangdong Provincial Key Laboratory of Digital Medicine and Biomechanics, National Key Discipline of Human Anatomy, School of Basic Medical Sciences, Southern Medical University, Guangzhou, 510515, China
| | - Jianlin Shen
- Department of Orthopedics, Affiliated Hospital of Putian University, Putian, 351100, China
| | - Xiang Luo
- Guangdong Medical Innovation Platform for Translation of 3D Printing Application, The Third Affiliated Hospital of Southern Medical University, Southern Medical University, Guangzhou, 510630, China
- Guangxi Clinical Research Center for Digital Medicine and 3D Printing, Guigang City People's Hospital, Guigang, 537000, China
| | - Ling Wang
- Biomaterials Research Center, School of Biomedical Engineering, Southern Medical University, Guangzhou, 510515, China
| | - Yaobin Wu
- Guangdong Engineering Research Center for Translation of Medical 3D Printing Application, Guangdong Provincial Key Laboratory of Digital Medicine and Biomechanics, National Key Discipline of Human Anatomy, School of Basic Medical Sciences, Southern Medical University, Guangzhou, 510515, China
| | - Wenhua Huang
- Guangdong Medical Innovation Platform for Translation of 3D Printing Application, The Third Affiliated Hospital of Southern Medical University, Southern Medical University, Guangzhou, 510630, China
- Guangdong Engineering Research Center for Translation of Medical 3D Printing Application, Guangdong Provincial Key Laboratory of Digital Medicine and Biomechanics, National Key Discipline of Human Anatomy, School of Basic Medical Sciences, Southern Medical University, Guangzhou, 510515, China
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Shah S, Patel V. Targeting posterior eye infections with colloidal carriers: The case of Ganciclovir. Int J Pharm 2023; 645:123427. [PMID: 37729977 DOI: 10.1016/j.ijpharm.2023.123427] [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: 05/18/2023] [Revised: 09/09/2023] [Accepted: 09/17/2023] [Indexed: 09/22/2023]
Abstract
The ocular system, unlike any other human body organ, is a system in which foreign bodies appear quite defenceless in front of the eye. Several infections of the ocular system occur due to various opportunistic conditions. Cytomegalovirus (CMV) is one of the opportunivores that causes several posterior eye infections. Ganciclovir (GCV),9-(2-hydroxy-1-(hydroxymethyl) ethoxymethyl), is aguanine-antiviral agent primarily used to treat CMV diseases. However, the major challenge is of lower bioavailability. Hence, GCV must be dosed repeatedly to enhance drug absorption. but this causes side effects like neutropenia and bone marrow suppression. So, formulators have used alternative formulation strategies such as prodrug formulation and colloidal drug delivery systems. In the prodrug strategy, they attempted to bind various compounds into the parent drug to increase the permeability and bioavailability of GCV. In colloidal drug delivery systems, mucoadhesive microspheres, nanoparticles, Niosome and liposome were employed to extend the drug residence time at the application site. This paper discusses several colloidal carriers combined with GCV to treat opportunistic CMV infection in the posterior ocular system. It reviews the limitations of conventional ocular therapy and explores various novel formulation approaches to improve the ocular bioavailability of GCV in the posterior chamber of the eye.
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Affiliation(s)
- Srushti Shah
- Parul Institute of Pharmacy, ParulUniversity, Gujarat 391760, India.
| | - Vandana Patel
- Krishna School of Pharmacy and Research, KPGU, Gujarat 391240, India
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Kwiatkowska A, Granicka LH. Anti-Viral Surfaces in the Fight against the Spread of Coronaviruses. MEMBRANES 2023; 13:membranes13050464. [PMID: 37233525 DOI: 10.3390/membranes13050464] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/08/2023] [Revised: 04/22/2023] [Accepted: 04/24/2023] [Indexed: 05/27/2023]
Abstract
This review is conducted against the background of nanotechnology, which provides us with a chance to effectively combat the spread of coronaviruses, and which primarily concerns polyelectrolytes and their usability for obtaining protective function against viruses and as carriers for anti-viral agents, vaccine adjuvants, and, in particular, direct anti-viral activity. This review covers nanomembranes in the form of nano-coatings or nanoparticles built of natural or synthetic polyelectrolytes--either alone or else as nanocomposites for creating an interface with viruses. There are not a wide variety of polyelectrolytes with direct activity against SARS-CoV-2, but materials that are effective in virucidal evaluations against HIV, SARS-CoV, and MERS-CoV are taken into account as potentially active against SARS-CoV-2. Developing new approaches to materials as interfaces with viruses will continue to be relevant in the future.
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Affiliation(s)
- Angelika Kwiatkowska
- Nalecz Institute of Biocybernetics and Biomedical Engineering, Polish Academy of Sciences, Ks. Trojdena 4 St., 02-109 Warsaw, Poland
| | - Ludomira H Granicka
- Nalecz Institute of Biocybernetics and Biomedical Engineering, Polish Academy of Sciences, Ks. Trojdena 4 St., 02-109 Warsaw, Poland
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Farokhi M, Mottaghitalab F, Babaluei M, Mojarab Y, Kundu SC. Advanced Multifunctional Wound Dressing Hydrogels as Drug Carriers. Macromol Biosci 2022; 22:e2200111. [PMID: 35866647 DOI: 10.1002/mabi.202200111] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2022] [Revised: 06/25/2022] [Indexed: 01/15/2023]
Abstract
Skin injuries, especially chronic wounds, remain a significant healthcare system problem. The number of burns, diabetic patients, pressure ulcers, and other damages is also growing, particularly in elderly populations. Several investigations are pursued in designing more effective therapeutics for treating different wound injuries. These efforts have resulted in developing multifunctional wound dressings to improve wound repair. For this, preparing multifunctional dressings using various methods has provided a new attitude to support effective skin regeneration. This review focuses on the recent developments in designing multifunctional hydrogel dressings with hemostasis, adhesiveness, antibacterial, and antioxidant properties.
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Affiliation(s)
- Mehdi Farokhi
- National Cell Bank of Iran, Pasteur Institute of Iran, Tehran, 1316943551, Iran
| | - Fatemeh Mottaghitalab
- Nanotechnology Research Centre, Faculty of Pharmacy, Tehran University of Medical Sciences, Tehran, 1417614411, Iran
| | - Mercedeh Babaluei
- National Cell Bank of Iran, Pasteur Institute of Iran, Tehran, 1316943551, Iran
| | - Yasamin Mojarab
- National Cell Bank of Iran, Pasteur Institute of Iran, Tehran, 1316943551, Iran
| | - Subhas C Kundu
- 3B's Research Group, I3Bs - Research Institute on Biomaterials, Biodegradables and Biomimetics, University of Minho, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, AvePark, Parque de Ciência e Tecnologia, Barco, Guimarães, 4805-017, Portugal
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Pourjabbar B, Biazar E, Heidari Keshel S, Ahani-Nahayati M, Baradaran-Rafii A, Roozafzoon R, Alemzadeh-Ansari MH. Bio-polymeric hydrogels for regeneration of corneal epithelial tissue*. INT J POLYM MATER PO 2021. [DOI: 10.1080/00914037.2021.1909586] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
- Bahareh Pourjabbar
- Department of Tissue Engineering and Applied Cell Sciences, School of Advanced Technologies in Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Esmaeil Biazar
- Tissue Engineering group, Department of Biomedical Engineering, Tonekabon Branch, Islamic Azad University, Tonekabon, Iran
| | - Saeed Heidari Keshel
- Department of Tissue Engineering and Applied Cell Sciences, School of Advanced Technologies in Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Milad Ahani-Nahayati
- Department of Tissue Engineering and Applied Cell Sciences, School of Advanced Technologies in Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | | | - Reza Roozafzoon
- Department of Tissue Engineering and Applied Cell Sciences, School of Advanced Technologies in Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
- Department of Advanced Medical Sciences and Technologies, School of Paramedicine, Shahid Sadoughi University of Medical Sciences, Yazd, Iran
| | - Mohammad Hasan Alemzadeh-Ansari
- Ophthalmic Research Center, Department of Ophthalmology, Labbafinejad Medical Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran
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In Situ -Forming Microparticles for Controlled Release of Rivastigmine: In Vitro Optimization and In Vivo Evaluation. Pharmaceuticals (Basel) 2021; 14:ph14010066. [PMID: 33466880 PMCID: PMC7829814 DOI: 10.3390/ph14010066] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2020] [Revised: 01/07/2021] [Accepted: 01/12/2021] [Indexed: 11/26/2022] Open
Abstract
In this work, sucrose acetate isobutyrate (SAIB) and polylactic co-glycolic acid (PLGA) were used alone or in combination as a matrix-former (MF) to prepare long-acting injectable rivastigmine (RV) in situ-forming microparticles (ISM). RV-ISM were prepared by the emulsification of an internal phase, containing the drug and the matrix former(s), into an external oily phase containing a stabilizer. The statistical design, Central Composite Design (CCD), was adopted as a quality by design (QbD) approach to optimize the formulation of RV-ISM systems. The fabricated RV-ISM systems was designed to minimize the initial burst drug release and maximize the sustainment of RV release from the ISM and ease of injection. The influence of critical formulation variables such as the matrix-former to drug (MF/D) ratio and SAIB to PLGA (S/P) ratio in the internal phase with respect to critical quality attributes (CQAs), such as the percentage drug release within the first day (Q1), the time required for 50% drug release (T50%) and the rate of injection, were studied using the CCD. The optimal RV-ISM system with the highest desirability value (0.74) was predicted to have an MF/D ratio of 11.7:1 (w/w) and an S/P ratio of 1.64:1 (w/w). The optimal RV-ISM system was assessed for its release profile, injectability, rheological properties, morphology, effect on cell viability, tolerance to γ-sterilization and in vivo performance in male albino rabbits. In vitro release studies revealed that the optimal RV-ISM system released 100% of its drug content throughout a release period of 30 days with only 15.5% drug release within the first day (Q1) and T50% of 13.09 days. Moreover, the optimal system showed a high injection rate of 1.012 mL/min, pseudoplastic flow, uniform spherical globules with homogenous particle size, minimal cytotoxicity and high tolerability to γ-sterilization. In vivo pharmacokinetic (PK) studies revealed that the rate of absorption of RV from the optimal RV-ISM system was controlled compared to a drug solution following either intramuscular (IM) or subcutaneous (SC) injection. Furthermore, the optimal RV-ISM was found to follow flip-flop PK with poor correlation between in vitro release and in vivo findings. These findings suggest that the optimal RV-ISM is a promising tool to achieve a sustained release therapy for RV; however, further investigation is still required to optimize the in vivo performance of RV-ISM.
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Arrighi A, Marquette S, Peerboom C, Denis L, Goole J, Amighi K. Development of PLGA microparticles with high immunoglobulin G-loaded levels and sustained-release properties obtained by spray-drying a water-in-oil emulsion. Int J Pharm 2019; 566:291-298. [DOI: 10.1016/j.ijpharm.2019.05.070] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2019] [Revised: 05/24/2019] [Accepted: 05/27/2019] [Indexed: 11/24/2022]
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Chan PS, Xian JW, Li Q, Chan CW, Leung SSY, To KKW. Biodegradable Thermosensitive PLGA-PEG-PLGA Polymer for Non-irritating and Sustained Ophthalmic Drug Delivery. AAPS JOURNAL 2019; 21:59. [PMID: 31020458 DOI: 10.1208/s12248-019-0326-x] [Citation(s) in RCA: 37] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/16/2019] [Accepted: 03/29/2019] [Indexed: 12/22/2022]
Abstract
Challenges of ophthalmic drug delivery arise from not only the limited solubility of hydrophobic therapeutics, but also the restricted permeability and fast clearance of drugs due to the complex anatomy and physiology of the eyes. Biodegradable thermosensitive polymer, poly(dl-lactide-co-glycolide-b-ethylene glycol-b-dl-lactide-co-glycolide) (PLGA-PEG-PLGA) is a desirable ophthalmic drug delivery system because it can be formulated into injectable solution which forms gel in situ to provide prolonged drug release. In this study, excellent biocompatibility of blank PLGA-PEG-PLGA (1800-1500-1800) thermogel was demonstrated with insignificant difference from saline noted in rat eye enucleation test, in vivo inflammation test upon topical instillation, and subconjunctival injection. After subconjunctival injection, thermogel formulations loaded with hydrophilic (rhodamine B) or hydrophobic (coumarin 6) fluorescent dyes were retained up to 4 weeks in eye tissues and significantly higher level was detected than rhodamine B solution or coumarin 6 suspension in weeks 3 and 4. Moreover, in vivo whole body imaging showed that dye-loaded (sulfo-cyanine 7 NHS ester, Cy7; or cyanine 7.5 alkyne, Cy7.5) thermogels had longer retention at the injection site and retarded release to other body parts than dye solutions. Generally, the release rate of hydrophobic dyes (coumarin 6 and Cy7.5) was much slower than that of the hydrophilic dyes (rhodamine B and Cy7) from the thermogel. In summary, the thermogel was safe for ophthalmic drug delivery and could deliver both hydrophobic and hydrophilic compounds for sustained drug release into eye tissues with single subconjunctival injection for better patient compliance and reduced risks on repeated injection.
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Affiliation(s)
- Pui Shan Chan
- School of Pharmacy, Faculty of Medicine, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong SAR, China
| | - Jia Wen Xian
- School of Chinese Medicine, Faculty of Medicine, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong SAR, China
| | - Qingqing Li
- School of Pharmacy, Faculty of Medicine, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong SAR, China
| | - Chun Wai Chan
- School of Chinese Medicine, Faculty of Medicine, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong SAR, China
| | - Sharon S Y Leung
- School of Pharmacy, Faculty of Medicine, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong SAR, China.
| | - Kenneth K W To
- School of Pharmacy, Faculty of Medicine, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong SAR, China.
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Okuda Y, Fukumoto M, Horie T, Oku H, Takai S, Nakanishi T, Matsuzaki K, Tsujimoto H, Ikeda T. Periocular injection of candesartan-PLGA microparticles inhibits laser-induced experimental choroidal neovascularization. Clin Ophthalmol 2019; 13:87-93. [PMID: 30643382 PMCID: PMC6318708 DOI: 10.2147/opth.s181110] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
Purpose Microparticle technology enables local administration of medication. The purpose of this study was to examine the inhibitory effect of locally administered candesartan (CAN)-encapsulated microparticles on experimental choroidal neovascularization (CNV). Methods Laser photocoagulation was used to induce CNV in Brown Norway rats. The rats were pretreated with subconjunctival injections of CAN (5.0 mg/eye) or phosphate buffer saline for 3 days before photocoagulation. The volume of CNV was evaluated 7 days after laser injury using the lectin staining technique. The infiltration of macrophages within the CNV lesion was determined using immunofluorescent staining with an anti-CD68 antibody. mRNA levels of MCP-1, IL1-β and VEGF in the retinal pigment epithelium/choroid complex were determined using quantitative PCR (q-PCR). Results CNV volume was significantly suppressed by the treatment with CAN compared with that in vehicle-treated eyes (P<0.05, two-tailed Student’s t-test). Subconjunctival injections of CAN decreased the numbers of CD68+ cells in the CNV lesion. The increased mRNA levels of MCP-1, IL1-β, and VEGF induced by photocoagulation was significantly suppressed following the local administration of CAN (P<0.05, two-tailed Student’s t-test). Conclusion Local administration of CAN inhibited experimentally induced CNV possibly through anti-inflammatory effects.
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Affiliation(s)
- Yoshitaka Okuda
- Department of Ophthalmology, Osaka Medical College, Osaka, Japan,
| | | | - Taeko Horie
- Department of Ophthalmology, Osaka Medical College, Osaka, Japan,
| | - Hidehiro Oku
- Department of Ophthalmology, Osaka Medical College, Osaka, Japan,
| | - Shinji Takai
- Department of Innovative Medicine, Graduate School of Medicine, Osaka Medical College, Osaka, Japan
| | - Toyofumi Nakanishi
- Department of Clinical and Laboratory Medicine, Osaka Medical College, Osaka, Japan
| | - Kaori Matsuzaki
- Research and Development Division, Hosokawa Micron Corporation, Osaka, Japan
| | - Hiroyuki Tsujimoto
- Research and Development Division, Hosokawa Micron Corporation, Osaka, Japan
| | - Tsunehiko Ikeda
- Department of Ophthalmology, Osaka Medical College, Osaka, Japan,
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El-Zaafarany GM, Soliman ME, Mansour S, Cespi M, Palmieri GF, Illum L, Casettari L, Awad GAS. A Tailored Thermosensitive PLGA-PEG-PLGA/Emulsomes Composite for Enhanced Oxcarbazepine Brain Delivery via the Nasal Route. Pharmaceutics 2018; 10:E217. [PMID: 30400577 PMCID: PMC6321319 DOI: 10.3390/pharmaceutics10040217] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2018] [Revised: 10/28/2018] [Accepted: 11/01/2018] [Indexed: 12/31/2022] Open
Abstract
The use of nanocarrier delivery systems for direct nose to brain drug delivery shows promise for achieving increased brain drug levels as compared to simple solution systems. An example of such nanocarriers is emulsomes formed from lipid cores surrounded and stabilised by a corona of phospholipids (PC) and a coating of Tween 80, which combines the properties of both liposomes and emulsions. Oxcarbazepine (OX), an antiepileptic drug, was entrapped in emulsomes and then localized in a poly(lactic acid-co-glycolic acid)-poly(ethylene glycol)-poly(lactic acid-co-glycolic acid) (PLGA-PEG-PLGA) triblock copolymer thermogel. The incorporation of OX emulsomes in thermogels retarded drug release and increased its residence time (MRT) in rats. The OX-emulsome and the OX-emulsome-thermogel formulations showed in vitro sustained drug release of 81.1 and 53.5%, respectively, over a period of 24 h. The pharmacokinetic studies in rats showed transport of OX to the systemic circulation after nasal administration with a higher uptake in the brain tissue in case of OX-emulsomes and highest MRT for OX-emulsomal-thermogels as compared to the IN OX-emulsomes, OX-solution and Trileptal® suspension. Histopathological examination of nasal tissues showed a mild vascular congestion and moderate inflammatory changes around congested vessels compared to saline control, but lower toxic effect than that reported in case of the drug solution.
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Affiliation(s)
- Ghada M El-Zaafarany
- Department of Pharmaceutics and Industrial Pharmacy, Faculty of Pharmacy, Ain Shams University, Monazzamet Elwehda Elafrikeya Street, Abbaseyya, Cairo 11566, Egypt.
| | - Mahmoud E Soliman
- Department of Pharmaceutics and Industrial Pharmacy, Faculty of Pharmacy, Ain Shams University, Monazzamet Elwehda Elafrikeya Street, Abbaseyya, Cairo 11566, Egypt.
| | - Samar Mansour
- Department of Pharmaceutics and Industrial Pharmacy, Faculty of Pharmacy, Ain Shams University, Monazzamet Elwehda Elafrikeya Street, Abbaseyya, Cairo 11566, Egypt.
- Department of Pharmaceutical Technology, Faculty of Pharmacy and Biotechnology, German University in Cairo, Al-Tagmoaa Alkhames, Cairo 11835, Egypt.
| | - Marco Cespi
- School of Pharmacy, University of Camerino, Via S. Agostino 1, 62032 Camerino (MC), Italy.
| | | | - Lisbeth Illum
- IDentity, 19 Cavendish Crescent North, The Park, Nottingham NG7 1BA, UK.
| | - Luca Casettari
- Department of Biomolecular Sciences, School of Pharmacy, University of Urbino, Piazza del Rinascimento 6, 61029 Urbino (PU), Italy.
| | - Gehanne A S Awad
- Department of Pharmaceutics and Industrial Pharmacy, Faculty of Pharmacy, Ain Shams University, Monazzamet Elwehda Elafrikeya Street, Abbaseyya, Cairo 11566, Egypt.
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Wang P, Li Y, Jiang M. Effects of the multilayer structures on Exenatide release and bioactivity in microsphere/thermosensitive hydrogel system. Colloids Surf B Biointerfaces 2018; 171:85-93. [PMID: 30015142 DOI: 10.1016/j.colsurfb.2018.04.063] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2018] [Revised: 04/28/2018] [Accepted: 04/30/2018] [Indexed: 02/08/2023]
Abstract
Traditional polypeptide-loaded PLGA microspheres (PM) using emulsion electrospray techniques often exhibit unsteady release and limited bioactivity. To solve these two problems, an Exenatide (EXT)-loaded multilayer system composed ofPM and thermosensitive hydrogel was prepared by the emulsion electrospray technique in this study. Hydrogel mixture were loaded in PLGA microspheres as Depot-hydrogel to prepare Gel/PM. The PM/Gel and Gel/PM/Gel systems were obtained by dispersion of PM and Gel/PM into hydrogel mixture, respectively. EXT in Gel/PM/Gel showed a constantly in vitro release for 30 days, which was significantly enhanced in comparison of those in the PM/Gel and the Gel/PM. PM/Gel and Gel/PM/Gel showed diminished burst release and no platform period compared with PM and Gel/PM. And these could be because the introduced Matrix-hydrogel outside, as a buffer layer, inhibited burst releases and exhibited a sustained manner. The inner Depot-hydrogelstructure slowed the PLGA degradation rate and drug release rate. As well, more than 15-day blood glucose levels in KKAy mice were greatly maintained at 7.50-9.50 mmol/L after a single subcutaneous injection of Gel/PM/Gel (4.95 μg/kg). Spatial stability and further bioactivity of released EXT were well protected by EXT-hydrogel complexes, and undesirable uptake of EXT and microspheres via phagocytes were also decreased by PEG shell. Thus, the long-acting microspheres/hydrogel multilayer system prepared by emulsion electrospray technique showed promising potentials for loading hydrophilic polypeptides and proteins.
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Affiliation(s)
- Puxiu Wang
- Department of Pharmacy, the First Affiliated Hospital of China Medical University, Shenyang, Liaoning, PR China; Department of the First Clinical Pharmacy, China Medical University, Shenyang, Liaoning, PR China.
| | - Yue Li
- Department of Pharmacy, the First Affiliated Hospital of China Medical University, Shenyang, Liaoning, PR China.
| | - Mingyan Jiang
- Department of Pharmacy, the First Affiliated Hospital of China Medical University, Shenyang, Liaoning, PR China.
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Wang P, Zhuo X, Chu W, Tang X. Exenatide-loaded microsphere/thermosensitive hydrogel long-acting delivery system with high drug bioactivity. Int J Pharm 2017; 528:62-75. [DOI: 10.1016/j.ijpharm.2017.05.069] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2017] [Revised: 05/29/2017] [Accepted: 05/29/2017] [Indexed: 12/17/2022]
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13
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PLGA-PEG-PLGA triblock copolymeric micelles as oral drug delivery system: In vitro drug release and in vivo pharmacokinetics assessment. J Colloid Interface Sci 2017; 490:542-552. [DOI: 10.1016/j.jcis.2016.11.089] [Citation(s) in RCA: 53] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2016] [Revised: 11/23/2016] [Accepted: 11/25/2016] [Indexed: 12/18/2022]
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14
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Alenezi A, Naito Y, Terukina T, Prananingrum W, Jinno Y, Tagami T, Ozeki T, Galli S, Jimbo R. Controlled release of clarithromycin from PLGA microspheres enhances bone regeneration in rabbit calvaria defects. J Biomed Mater Res B Appl Biomater 2017; 106:201-208. [DOI: 10.1002/jbm.b.33844] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2016] [Revised: 11/02/2016] [Accepted: 12/19/2016] [Indexed: 01/08/2023]
Affiliation(s)
- Ali Alenezi
- Department of Prosthodontics; Faculty of Odontology, Malmö University; Malmö Sweden
| | - Yoshihito Naito
- Oral Implant Center, Tokushima University Hospital; Tokushima Japan
| | - Takayuki Terukina
- Research Institute of Pharmaceutical Sciences, Musashino University; Tokyo Japan
| | - Widyasri Prananingrum
- Department of Oral and Maxillofacial Prosthodontics and Oral Implantology; Institute of Biomedical Sciences, Tokushima University Graduate School; Tokushima Japan
| | - Yohei Jinno
- Department of Oral and Maxillofacial Surgery and Oral Medicine; Faculty of Odontology, Malmö University; Malmö Sweden
| | - Tatsuaki Tagami
- Drug Delivery and Nano Pharmaceutics, Graduate School of Pharmaceutical Sciences; Nagoya City University; Aichi Japan
| | - Tetsuya Ozeki
- Drug Delivery and Nano Pharmaceutics, Graduate School of Pharmaceutical Sciences; Nagoya City University; Aichi Japan
| | - Silvia Galli
- Department of Prosthodontics; Faculty of Odontology, Malmö University; Malmö Sweden
| | - Ryo Jimbo
- Department of Oral and Maxillofacial Surgery and Oral Medicine; Faculty of Odontology, Malmö University; Malmö Sweden
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15
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Wang P, Chu W, Zhuo X, Zhang Y, Gou J, Ren T, He H, Yin T, Tang X. Modified PLGA–PEG–PLGA thermosensitive hydrogels with suitable thermosensitivity and properties for use in a drug delivery system. J Mater Chem B 2017; 5:1551-1565. [DOI: 10.1039/c6tb02158a] [Citation(s) in RCA: 57] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
PLGA–PEG–PLGA (PPP) triblock copolymer is the most widely studied thermosensitive hydrogel owing to its non-toxic, biocompatible, biodegradable, and thermosensitive properties.
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Affiliation(s)
- Puxiu Wang
- Department of Pharmaceutics
- Shenyang Pharmaceutical University
- Shenyang
- China
| | - Wei Chu
- Department of Pharmaceutics
- Shenyang Pharmaceutical University
- Shenyang
- China
| | - Xuezhi Zhuo
- Department of Pharmaceutics
- Shenyang Pharmaceutical University
- Shenyang
- China
| | - Yu Zhang
- Department of Pharmaceutics
- Shenyang Pharmaceutical University
- Shenyang
- China
| | - Jingxin Gou
- Department of Pharmaceutics
- Shenyang Pharmaceutical University
- Shenyang
- China
| | - Tianyang Ren
- Department of Pharmaceutics
- Shenyang Pharmaceutical University
- Shenyang
- China
| | - Haibing He
- Department of Pharmaceutics
- Shenyang Pharmaceutical University
- Shenyang
- China
| | - Tian Yin
- School of Functional Food and Wine
- Shenyang Pharmaceutical University
- Shenyang
- China
| | - Xing Tang
- Department of Pharmaceutics
- Shenyang Pharmaceutical University
- Shenyang
- China
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16
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Basu A, Kunduru KR, Doppalapudi S, Domb AJ, Khan W. Poly(lactic acid) based hydrogels. Adv Drug Deliv Rev 2016; 107:192-205. [PMID: 27432797 DOI: 10.1016/j.addr.2016.07.004] [Citation(s) in RCA: 84] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2016] [Revised: 06/28/2016] [Accepted: 07/08/2016] [Indexed: 11/29/2022]
Abstract
Polylactide (PLA) and its copolymers are hydrophobic polyesters used for biomedical applications. Hydrogel medicinal implants have been used as drug delivery vehicles and scaffolds for tissue engineering, tissue augmentation and more. Since lactides are non-functional, they are copolymerized with hydrophilic monomers or conjugated to a hydrophilic moiety to form hydrogels. Copolymers of lactic and glycolic acids with poly(ethylene glycol) (PEG) provide thermo-responsive hydrogels. Physical crosslinking mechanisms of PEG-PLA or PLA-polysaccharides include: lactic acid segment hydrophobic interactions, stereocomplexation of D and L-lactic acid segments, ionic interactions, and chemical bond formation by radical or photo crosslinking. These hydrogels may also be tailored as stimulus responsive (pH, photo, or redox). PLA and its copolymers have also been polymerized to include urethane bonds to fabricate shape memory hydrogels. This review focuses on the synthesis, characterization, and applications of PLA containing hydrogels.
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Affiliation(s)
- Arijit Basu
- School of Pharmacy-Faculty of Medicine, The Hebrew University of Jerusalem, and Jerusalem College of Engineering (JCE), Jerusalem 91120, Israel.
| | - Konda Reddy Kunduru
- School of Pharmacy-Faculty of Medicine, The Hebrew University of Jerusalem, and Jerusalem College of Engineering (JCE), Jerusalem 91120, Israel
| | - Sindhu Doppalapudi
- Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research (NIPER), Hyderabad 500037, India
| | - Abraham J Domb
- School of Pharmacy-Faculty of Medicine, The Hebrew University of Jerusalem, and Jerusalem College of Engineering (JCE), Jerusalem 91120, Israel.
| | - Wahid Khan
- Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research (NIPER), Hyderabad 500037, India
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17
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Mabrouk M, Mulla JAS, Kumar P, Chejara DR, Badhe RV, Choonara YE, du Toit LC, Pillay V. Intestinal Targeting of Ganciclovir Release Employing a Novel HEC-PAA Blended Lyomatrix. AAPS PharmSciTech 2016; 17:1120-30. [PMID: 26552400 DOI: 10.1208/s12249-015-0442-6] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2015] [Accepted: 10/19/2015] [Indexed: 11/30/2022] Open
Abstract
A hydroxyethylcellulose-poly(acrylic acid) (HEC-PAA) lyomatrix was developed for ganciclovir (GCV) intestine targeting to overcome its undesirable degradation in the stomach. GCV was encapsulated within the HEC-PAA lyomatrix prepared by lyophilization. Conventional tablets were also prepared with identical GCV concentrations in order to compare the GCV release behavior from the lyomatrix and tablets. GCV incorporation (75.12%) was confirmed using FTIR, DSC, and TGA. The effect of GCV loading on the microstructure properties of the lyomatrix was evaluated by SEM, AFM, and BET surface area measurements. The in vitro drug release study showed steady and rapid release profiles from the GCV-loaded lyomatrix compared with the tablet formulation at identical pH values. Minimum GCV release was observed at acidic pH (≤40%) and maximum release occurred at intestinal pH values (≥90%) proving the intestinal targeting ability of the lyomatrix. Kinetic modeling revealed that the GCV-loaded lyomatrix exhibited zero-order release kinetics (n = 1), while the tablets were best described via the Peppas model. Textural analysis highlighted enhanced matrix resilience and rigidity gradient (12.5%, 20 Pa) for the GCV-loaded lyomatrix compared to the pure (7%, 9.5 Pa) HEC-PAA lyomatrix. Bench-top MRI imaging was used to confirm the mechanism of GCV release behavior by monitoring the swelling and erosion rates. The swelling and erosion rate of the tablets was not sufficient to achieve rapid zero-order GCV release as with the lyomatrix. These combined results suggest that the HEC-PAA lyomatrix may be suitable for GCV intestinal targeting after oral administration.
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Yang X, Trinh HM, Agrahari V, Sheng Y, Pal D, Mitra AK. Nanoparticle-Based Topical Ophthalmic Gel Formulation for Sustained Release of Hydrocortisone Butyrate. AAPS PharmSciTech 2016; 17:294-306. [PMID: 26085051 DOI: 10.1208/s12249-015-0354-5] [Citation(s) in RCA: 57] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2015] [Accepted: 06/09/2015] [Indexed: 01/23/2023] Open
Abstract
This study was conducted to develop formulations of hydrocortisone butyrate (HB)-loaded poly(D,L-lactic-co-glycolic acid) nanoparticles (PLGA NP) suspended in thermosensitive gel to improve ocular bioavailability of HB for the treatment of bacterial corneal keratitis. PLGA NP with different surfactants such as polyvinyl alcohol (PVA), pluronic F-108, and chitosan were prepared using oil-in-water (O/W) emulsion evaporation technique. NP were characterized with respect to particle size, entrapment efficiency, polydispersity, drug loading, surface morphology, zeta potential, and crystallinity. In vitro release of HB from NP showed a biphasic release pattern with an initial burst phase followed by a sustained phase. Such burst effect was completely eliminated when nanoparticles were suspended in thermosensitive gels and zero-order release kinetics was observed. In HCEC cell line, chitosan-emulsified NP showed the highest cellular uptake efficiency over PVA- and pluronic-emulsified NP (59.09 ± 6.21%, 55.74 ± 6.26%, and 62.54 ± 3.30%, respectively) after 4 h. However, chitosan-emulsified NP indicated significant cytotoxicity of 200 and 500 μg/mL after 48 h, while PVA- and pluronic-emulsified NP exhibited no significant cytotoxicity. PLGA NP dispersed in thermosensitive gels can be considered as a promising drug delivery system for the treatment of anterior eye diseases.
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19
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Ring-opening polymerization of ε-caprolactone initiated by ganciclovir (GCV) for the preparation of GCV-tagged polymeric micelles. Molecules 2015; 20:2857-67. [PMID: 25675152 PMCID: PMC6272954 DOI: 10.3390/molecules20022857] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2014] [Accepted: 02/03/2015] [Indexed: 11/21/2022] Open
Abstract
Ganciclovir (GCV) is a nucleoside analogue with antiviral activity against herpes viral infections, and the most widely used antiviral to treat cytomegalovirus infections. However, the low bioavailability and short half-life of GCV necessitate the development of a carrier for sustained delivery. In this study, guanosine-based GCV was used as the initiator directly in ring-opening polymerization of ε-caprolactone (ε-CL) to form hydrophobic GCV-poly(caprolactone) (GCV-PCL) which was then grafted with hydrophilic chitosan to form amphiphilic copolymers for the preparation of stable micellar nanoparticles. Successful synthesis of GCV-PCL and GCV-PCL-chitosan were verified by 1H-NMR analysis. Self-assembled micellar nanoparticles were characterized by dynamic light scattering and zetasizer with an average size of 117 nm and a positive charge of 24.2 mV. The drug release kinetics of GCV was investigated and cytotoxicity assay demonstrated that GCV-tagged polymeric micelles were non-toxic. Our results showed that GCV could be used directly in the initiation of ring-opening polymerization of ε-CL and non-toxic polymeric micelles for GCV delivery can be formed.
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20
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Yang X, Shah SJ, Wang Z, Agrahari V, Pal D, Mitra AK. Nanoparticle-based topical ophthalmic formulation for sustained release of stereoisomeric dipeptide prodrugs of ganciclovir. Drug Deliv 2015; 23:2399-2409. [PMID: 25564964 DOI: 10.3109/10717544.2014.996833] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Poly(d,l-lactic-co-glycolic acid) (PLGA) nanoparticles (NP) of Val-Val dipeptide monoester prodrugs of ganciclovir (GCV) including L-Val-L-Val-GCV (LLGCV), L-Val-D-Val-GCV (LDGCV) and D-Val-L-Val-GCV (DLGCV) were formulated and dispersed in thermosensitive PLGA-PEG-PLGA polymer gel for the treatment of herpes simplex virus type 1 (HSV-1)-induced viral corneal keratitis. Nanoparticles containing prodrugs of GCV were prepared by a double-emulsion solvent evaporation technique using various PLGA polymers with different drug/polymer ratios. Nanoparticles were characterized with respect to particle size, entrapment efficiency, polydispersity, drug loading, surface morphology, zeta potential and crystallinity. Prodrugs-loaded NP were incorporated into in situ gelling system. These formulations were examined for in vitro release and cytotoxicity. The results of optimized entrapment efficiencies of LLGCV-, LDGCV- and DLGCV-loaded NP are of 38.7 ± 2.0%, 41.8 ± 1.9%, and 45.3 ± 2.2%; drug loadings 3.87 ± 0.20%, 2.79 ± 0.13% and 3.02 ± 0.15%; yield 85.2 ± 3.0%, 86.9 ± 4.6% and 76.9 ± 2.1%; particle sizes 116.6 ± 4.5, 143.0 ± 3.8 and 134.1 ± 5.2 nm; and zeta potential -15.0 ± 4.96, -13.8 ± 5.26 and -13.9 ± 5.14 mV, respectively. Cytotoxicity studies suggested that all the formulations are non-toxic. In vitro release of prodrugs from NP showed a biphasic release pattern with an initial burst phase followed by a sustained phase. Such burst effect was completely eliminated when NP were suspended in thermosensitive gels with near zero-order release kinetics. Prodrugs-loaded PLGA NP dispersed in thermosensitive gels can thus serve as a promising drug delivery system for the treatment of anterior eye diseases.
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Affiliation(s)
- Xiaoyan Yang
- a Division of Pharmaceutical Sciences, School of Pharmacy , University of Missouri - Kansas City , Kansas City , MO , USA
| | - Sujay J Shah
- a Division of Pharmaceutical Sciences, School of Pharmacy , University of Missouri - Kansas City , Kansas City , MO , USA
| | - Zhiying Wang
- a Division of Pharmaceutical Sciences, School of Pharmacy , University of Missouri - Kansas City , Kansas City , MO , USA
| | - Vibhuti Agrahari
- a Division of Pharmaceutical Sciences, School of Pharmacy , University of Missouri - Kansas City , Kansas City , MO , USA
| | - Dhananjay Pal
- a Division of Pharmaceutical Sciences, School of Pharmacy , University of Missouri - Kansas City , Kansas City , MO , USA
| | - Ashim K Mitra
- a Division of Pharmaceutical Sciences, School of Pharmacy , University of Missouri - Kansas City , Kansas City , MO , USA
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21
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Liu J, Jiang Y, Cui Y, Xu C, Ji X, Luan Y. Cytarabine-AOT catanionic vesicle-loaded biodegradable thermosensitive hydrogel as an efficient cytarabine delivery system. Int J Pharm 2014; 473:560-71. [DOI: 10.1016/j.ijpharm.2014.07.032] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2014] [Revised: 07/16/2014] [Accepted: 07/23/2014] [Indexed: 10/25/2022]
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22
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Hirani A, Grover A, Lee YW, Pathak Y, Sutariya V. Triamcinolone acetonide nanoparticles incorporated in thermoreversible gels for age-related macular degeneration. Pharm Dev Technol 2014; 21:61-7. [DOI: 10.3109/10837450.2014.965326] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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23
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Shah SS, Denham LV, Elison JR, Bhattacharjee PS, Clement C, Huq T, Hill JM. Drug delivery to the posterior segment of the eye for pharmacologic therapy. EXPERT REVIEW OF OPHTHALMOLOGY 2014; 5:75-93. [PMID: 20305803 DOI: 10.1586/eop.09.70] [Citation(s) in RCA: 68] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Treatment of diseases of the posterior segment of the eye, such as age-related macular degeneration, cytomegalovirus retinitis, diabetic retinopathy, posterior uveitis and retinitis pigmentosa, requires novel drug delivery systems that can overcome the many barriers for efficacious delivery of therapeutic drug concentrations. This challenge has prompted the development of biodegradable and nonbiodegradable sustained-release systems for injection or transplantation into the vitreous as well as drug-loaded nanoparticles, microspheres and liposomes. These drug delivery systems utilize topical, systemic, subconjunctival, intravitreal, transscleral and iontophoretic routes of administration. The focus of research has been the development of methods that will increase the efficacy of spatiotemporal drug application, resulting in more successful therapy for patients with posterior segment diseases. This article summarizes recent advances in the research and development of drug delivery methods of the posterior chamber of the eye, with an emphasis on the use of implantable devices as well as micro- and nanoparticles.
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Affiliation(s)
- Shalin S Shah
- Department of Ophthalmology, Louisiana State University Health Sciences Center (LSUHSC), 2020 Gravier St. Suite B, Room 3E6, New Orleans, LA 70112-2234, USA, Tel.: +1 678 296 2334, ,
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24
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Tran TH, Ramasamy T, Poudel BK, Marasini N, Moon BK, Cho HJ, Choi HG, Yong CS, Kim JO. Preparation and characterization of spray-dried gelatin microspheres encapsulating ganciclovir. Macromol Res 2013. [DOI: 10.1007/s13233-014-2018-9] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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25
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Campoccia D, Montanaro L, Arciola CR. A review of the clinical implications of anti-infective biomaterials and infection-resistant surfaces. Biomaterials 2013; 34:8018-29. [PMID: 23932292 DOI: 10.1016/j.biomaterials.2013.07.048] [Citation(s) in RCA: 215] [Impact Index Per Article: 19.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2013] [Accepted: 07/15/2013] [Indexed: 12/28/2022]
Abstract
Infection is currently regarded as the most severe and devastating complication associated to the use of biomaterials. The important social, clinical and economic impacts of implant-related infections are promoting the efforts to obviate these severe diseases. In this context, the development of anti-infective biomaterials and of infection-resistant surfaces is being regarded as the main strategy to prevent the establishment of implant colonisation and biofilm formation by bacteria. In this review, the attention is focused on the biomaterial-associated infections, from which the need for anti-infective biomaterials originates. Biomaterial-associated infections differ markedly for epidemiology, aetiology and severity, depending mainly on the anatomic site, on the time of biomaterial application, and on the depth of the tissues harbouring the prosthesis. Here, the diversity and complexity of the different scenarios where medical devices are currently utilised are explored, providing an overview of the emblematic applicative fields and of the requirements for anti-infective biomaterials.
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Affiliation(s)
- Davide Campoccia
- Research Unit on Implant Infections, Rizzoli Orthopaedic Institute, Bologna, Via di Barbiano 1/10, 40136 Bologna, Italy
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26
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Scheler S. The polymer free volume as a controlling factor for drug release from poly(lactide-co-glycolide) microspheres. J Appl Polym Sci 2013. [DOI: 10.1002/app.39740] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Stefan Scheler
- Sandoz GmbH; Sandoz Development Center Austria; Austria Kundl 6250 Austria
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27
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Nagahama K, Takahashi A, Ohya Y. Biodegradable polymers exhibiting temperature-responsive sol–gel transition as injectable biomedical materials. REACT FUNCT POLYM 2013. [DOI: 10.1016/j.reactfunctpolym.2012.11.003] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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28
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Chen F, Yin G, Liao X, Yang Y, Huang Z, Gu J, Yao Y, Chen X, Gao H. Preparation, characterization and in vitro release properties of morphine-loaded PLLA-PEG-PLLA microparticles via solution enhanced dispersion by supercritical fluids. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2013; 24:1693-1705. [PMID: 23625317 DOI: 10.1007/s10856-013-4926-1] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/07/2012] [Accepted: 04/04/2013] [Indexed: 06/02/2023]
Abstract
Morphine-loaded poly(L-lactide)-poly(ethylene glycol)-poly(L-lactide) (PLLA-PEG-PLLA) microparticles were prepared using solution enhanced dispersion by supercritical CO2 (SEDS). The effects of process variables on the morphology, particles size, drug loading (DL), encapsulation efficiency and release properties of the microparticles were investigated. All particles showed spherical or ellipsoidal shape with the mean diameter of 2.04-5.73 μm. The highest DL of 17.92 % was obtained when the dosage ratio of morphine to PLLA-PEG-PLLA reached 1:5, and the encapsulation efficiency can be as high as 87.31 % under appropriate conditions. Morphine-loaded PLLA-PEG-PLLA microparticles displayed short-term release with burst release followed by sustained release within days or long-term release lasted for weeks. The degradation test of the particles showed that the degradation rate of PLLA-PEG-PLLA microparticles was faster than that of PLLA microparticles. The results collectively suggest that PLLA-PEG-PLLA can be a promising candidate polymer for the controlled release system.
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Affiliation(s)
- Fu Chen
- College of Materials Science and Engineering, Sichuan University, No.24, South 1st Section, 1st Ring Road, Chengdu, 610065, Sichuan, People's Republic of China
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Ling T, Yu M, Weng W, Wang H, Cheng K, Lin J, Du P. Improvement of drug elution in thin mineralized collagen coatings with PLGA-PEG-PLGA micelles. J Biomed Mater Res A 2013; 101:3256-65. [PMID: 23606374 DOI: 10.1002/jbm.a.34625] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2012] [Revised: 01/21/2013] [Accepted: 01/25/2013] [Indexed: 01/17/2023]
Abstract
A mineralized collagen (MC) coating on metallic implants has shown great potential as orthopedic material due to high biological responses. However, their drug delivery capacity remains unsatisfactory since a serious burst release may occur and long-term release is hard to be achieved. Aiming to improve the drug-eluting capability, we incorporated drug-loaded PLGA-PEG-PLGA (PPP) micelles into the thin coating. The in vitro release profiles showed that the burst release in the initial 8 h of the modified coating decreased from 81% to 58% compared to MC coating alone; meanwhile, the release duration was prolonged from 3 days to 1 week. Additionally, the release kinetics of vancomycin hydrochloride (VH, the model drug) could be adjusted by changing the size and concentration of PPP micelles. Interestingly, less initial release of VH caused by micelle immobilization did not affect the antibacterial activity in the early stage of implantation according to the antimicrobial test. The cytocompatibility assay demonstrated that the VH-loaded PPP micelles did not have negative effect on the bioactivity of coating which greatly enhanced cell activity compared to bare Ti substrates. Thus, the MC coatings with PPP micelles could be an effective implant route for bone repair.
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Affiliation(s)
- Ting Ling
- Department of Materials Science and Engineering, State Key Laboratory of Silicon Materials, Zhejiang University, Hangzhou, 310027, China
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Du L, Tong L, Jin Y, Jia J, Liu Y, Su C, Yu S, Li X. A multifunctional in situ-forming hydrogel for wound healing. Wound Repair Regen 2012; 20:904-10. [PMID: 23110551 DOI: 10.1111/j.1524-475x.2012.00848.x] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2011] [Accepted: 07/19/2012] [Indexed: 11/28/2022]
Abstract
In this study, a multifunctional in situ-forming hydrogel (MISG) was prepared as a wound dressing designed to stop bleeding, inhibit inflammation, relieve pain, and improve healing. A mixture of poloxamers 407 and 188 was used for the matrix of the MISG. Other ingredients include aminocaproic acid (to stop bleeding), povidone iodine (anti-infective), lidocaine (pain relief), and chitosan (to enhance wound healing and regeneration). The incipient gelation temperature of the MISG was modified by varying the poloxamer concentration. Poloxamer cytotoxicity was evaluated in addition to the effect of the MISG on hemostasis in rabbits, pain relief in mice, bacteriostasis in vitro, and wound healing. The optimal MISG matrix consisted of 30% (w/v) poloxamer (407/188, 1 : 1, w/w) solution and was able to change to a gel within 10 minutes at 37 °C. The poloxamer solution had no cytotoxicity in fibroblasts. Compared to sterile gauze alone, the MISG significantly shortened average hemostasis time and decreased bleeding. The hydrogel showed strong bacteriostatic action similar to povidone iodine solution. It markedly increased the pain threshold and accelerated wound healing compared to the gauze. The MISG is a promising formulation for wound healing in emergency situations.
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Affiliation(s)
- Lina Du
- Department of Pharmaceutical Sciences, Beijing Institute of Radiation Medicine, Beijing, China
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31
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Xiong S, George S, Yu H, Damoiseaux R, France B, Ng KW, Loo JSC. Size influences the cytotoxicity of poly (lactic-co-glycolic acid) (PLGA) and titanium dioxide (TiO(2)) nanoparticles. Arch Toxicol 2012; 87:1075-86. [PMID: 22983807 DOI: 10.1007/s00204-012-0938-8] [Citation(s) in RCA: 93] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2012] [Accepted: 08/30/2012] [Indexed: 11/26/2022]
Abstract
The aim of this study is to uncover the size influence of poly (lactic-co-glycolic acid) (PLGA) and titanium dioxide (TiO(2)) nanoparticles on their potential cytotoxicity. PLGA and TiO(2) nanoparticles of three different sizes were thoroughly characterized before in vitro cytotoxic tests which included viability, generation of reactive oxygen species (ROS), mitochondrial depolarization, integrity of plasma membrane, intracellular calcium influx and cytokine release. Size-dependent cytotoxic effect was observed in both RAW264.7 cells and BEAS-2B cells after cells were incubated with PLGA or TiO(2) nanoparticles for 24 h. Although PLGA nanoparticles did not trigger significantly lethal toxicity up to a concentration of 300 μg/ml, the TNF-α release after the stimulation of PLGA nanoparticles should not be ignored especially in clinical applications. Relatively more toxic TiO(2) nanoparticles triggered cell death, ROS generation, mitochondrial depolarization, plasma membrane damage, intracellular calcium concentration increase and size-dependent TNF-α release, especially at a concentration higher than 100 μg/ml. These cytotoxic effects could be due to the size-dependent interaction between nanoparticles and biomolecules, as smaller particles tend to adsorb more biomolecules. In summary, we demonstrated that the ability of protein adsorption could be an important paradigm to predict the in vitro cytotoxicity of nanoparticles, especially for low toxic nanomaterials such as PLGA and TiO(2) nanoparticles.
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Affiliation(s)
- Sijing Xiong
- School of Materials Science and Engineering, Nanyang Technological University, Block N4.1, 50 Nanyang Avenue, Singapore 639798, Singapore
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Cai X, Luan Y, Jiang Y, Song A, Shao W, Li Z, Zhao Z. Huperzine A-phospholipid complex-loaded biodegradable thermosensitive polymer gel for controlled drug release. Int J Pharm 2012; 433:102-11. [PMID: 22583846 DOI: 10.1016/j.ijpharm.2012.05.009] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2012] [Revised: 04/20/2012] [Accepted: 05/01/2012] [Indexed: 11/20/2022]
Abstract
The huperzine A-phospholipid complex loaded biodegradable thermosensitive PLGA-PEG-PLGA polymer gel was studied as injectable implant system for controlled release of huperzine-A (HA). First, HA molecules were successfully incorporated into the soybean phosphatidylcholine (SP) molecules to form the huperzine-A-soybean phosphatidylcholine complexes (HA-SPC), which was proved by FT-IR, DSC, XRD, solubility study, TEM, etc. The results indicated that hydrogen bonds and electrostatic interaction between HA and SP molecules play an important role in the formation of HA-SPC. Secondly, the HA-SPC was loaded into biodegradable PLGA-PEG-PLGA thermosensitive gel as injectable implant material to control the release of HA. The in vitro and in vivo drug release behaviors of the prepared products were studied. The in vitro release studies demonstrated that the HA-SPC-loaded gel significantly reduced the initial burst of drug release and extended the release period to about 2 weeks. The in vivo pharmacokinetics study of HA-SPC-loaded gel in rabbits showed that plasma concentration of HA (2.54-0.15ng/mL) was detected for nearly 2 weeks from delivery systems upon single subcutaneous injection. What's more, the in vitro release pattern correlated well with the in vivo pharmacokinetics profile. The present study indicates that HA-SPC loaded PLGA-PEG-PLGA thermal gel may be an attractive candidate vehicle for controlled HA release.
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Affiliation(s)
- Xiaoqing Cai
- School of Pharmaceutical Science and Center for Pharmaceutical Research & Drug Delivery Systems, Shandong University, Jinan, Shandong Province 250012, PR China
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D'Arrigo G, Di Meo C, Pescosolido L, Coviello T, Alhaique F, Matricardi P. Calcium alginate/dextran methacrylate IPN beads as protecting carriers for protein delivery. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2012; 23:1715-1722. [PMID: 22528076 DOI: 10.1007/s10856-012-4644-0] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/10/2011] [Accepted: 04/05/2012] [Indexed: 05/31/2023]
Abstract
In the present study, mechanical and protein delivery properties of a system based on the interpenetration of calcium-alginate (Ca-Alg) and dextran-methacrylate (Dex-MA) networks are shown. Interpenetrated hydrogels beads were prepared by means of the alginate chains crosslinking with calcium ions, followed by the exposure to UV light that allows the Dex-MA network formation. Optical microscope analysis showed an average diameter of the IPN beads (Ca-Alg/Dex-MA) of 2 mm. This dimension was smaller than that of Ca-Alg beads because of the Dex-MA presence. Moreover, the strength of the IPN beads, and of their corresponding hydrogels, was influenced by the Dex-MA concentration and the crosslinking time. Model proteins (BSA and HRP) were successfully entrapped into the beads and released at a controlled rate, modulated by changing the Dex-MA concentration. The enzymatic activity of HRP released from the beads was maintained. These novel IPN beads have great potential as protein delivery system.
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Affiliation(s)
- Giorgia D'Arrigo
- Department of Drug Chemistry and Technologies, Sapienza University of Rome, Piazzale Aldo Moro 5, 00185, Rome, Italy
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Li F, Hurley B, Liu Y, Leonard B, Griffith M. Controlled release of bevacizumab through nanospheres for extended treatment of age-related macular degeneration. Open Ophthalmol J 2012; 6:54-8. [PMID: 22798970 PMCID: PMC3394187 DOI: 10.2174/1874364101206010054] [Citation(s) in RCA: 73] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2012] [Revised: 06/11/2012] [Accepted: 06/11/2012] [Indexed: 11/23/2022] Open
Abstract
Bevacizumab (Avastin®) has been used by ophthalmologists in many countries as an off-label drug for the treatment of wet age-related macular degeneration (AMD). Due to its short half-life necessitating frequent intravitreal injection, a method for sustained delivery is in need. We demonstrated that bevacizumab could be released in a sustained fashion over 90 days from nano- and microspheres fabricated from poly(DL-lactide-co-glycolide) and poly(ethylene glycol)-b-poly(D,L-lactic acid), respectively. The drug release rate could be adjusted by alteration of the drug/polymer ratio. The use of such nano- and microspheres as bevacizumab delivery vehicles may improve the treatment of wet AMD.
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Affiliation(s)
- Fengfu Li
- Ottawa Hospital Research Institute, 501 Smyth Road, Ottawa, Ontario K1H8L6, Canada
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Zhu J, Dang HC, Wang WT, Wang XL, Wang YZ. Cellulose Diacetate-g-poly(p-dioxanone) Co-polymer: Synthesis, Properties and Microsphere Preparation. JOURNAL OF BIOMATERIALS SCIENCE-POLYMER EDITION 2012; 22:981-99. [DOI: 10.1163/092050610x497863] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Affiliation(s)
- Jiang Zhu
- a Center for Degradable and Flame-Retardant Polymeric Materials, College of Chemistry, State Key Laboratory of Polymer Materials Engineering, National Engineering Laboratory of Eco-Friendly Polymeric Materials (Sichuan), Sichuan University, Chengdu 610064, P. R. China
| | - Hai-Chun Dang
- b Center for Degradable and Flame-Retardant Polymeric Materials, College of Chemistry, State Key Laboratory of Polymer Materials Engineering, National Engineering Laboratory of Eco-Friendly Polymeric Materials (Sichuan), Sichuan University, Chengdu 610064, P. R. China
| | - Wen-Tao Wang
- c Center for Degradable and Flame-Retardant Polymeric Materials, College of Chemistry, State Key Laboratory of Polymer Materials Engineering, National Engineering Laboratory of Eco-Friendly Polymeric Materials (Sichuan), Sichuan University, Chengdu 610064, P. R. China
| | - Xiu-Li Wang
- d Center for Degradable and Flame-Retardant Polymeric Materials, College of Chemistry, State Key Laboratory of Polymer Materials Engineering, National Engineering Laboratory of Eco-Friendly Polymeric Materials (Sichuan), Sichuan University, Chengdu 610064, P. R. China.
| | - Yu-Zhong Wang
- e Center for Degradable and Flame-Retardant Polymeric Materials, College of Chemistry, State Key Laboratory of Polymer Materials Engineering, National Engineering Laboratory of Eco-Friendly Polymeric Materials (Sichuan), Sichuan University, Chengdu 610064, P. R. China
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Chen YC, Hsieh WY, Lee WF, Zeng DT. Effects of surface modification of PLGA-PEG-PLGA nanoparticles on loperamide delivery efficiency across the blood–brain barrier. J Biomater Appl 2011; 27:909-22. [DOI: 10.1177/0885328211429495] [Citation(s) in RCA: 68] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
In this study, we developed a nanoparticle system for drug delivery across the blood–brain barrier (BBB). The nanoparticle consisting of loperamide and poly(lactide-co-glycolide)-poly(ethylene glycol)-poly(lactide-co-glycolide) (PLGA-PEG-PLGA) triblock copolymer were prepared by the nanoprecipitation method; then the nanoparticles were coated with poloxamer 188 or polysorbate 80. The effects of poloxamer 188 or polysorbate 80 on the physicochemical and pharmaceutical properties of the coated nanoparticles were investigated. Loperamide, which does not cross the blood–brain barrier (BBB) but exerts antinociceptive effects after direct injection into the brain, was encapsulated by different polymeric materials and used as a model drug. The in vitro BBB penetration study shows that the surfactant-coated PLGA-PEG-PLGA nanoparticles could have penetration of 14.4–21.2%, which was better than the PLGA-PEG-PLGA nanoparticles (PEP) (8.2%) and the PLGA nanoparticles (PN) (4.3%). The biopsy studies also confirm that the PEP coated by surfactant could increase the penetration. The results of nanoparticles accumulation in brain tissue show that the PEP coated by surfactant had a much higher concentration than both the PEP and the PN. Moreover, the maximal possible antinociception effect (MPE) for the surfactant-coated PEP was 21–35% at 150 min after administering the drug intravenously, which was significantly better than just the PEP (MPE: 11.6%). The results of the formalin test show that the surfactant-coated PEP administered intravenously 150 min prior to the formalin injection could greatly reduce the pain response in the first phase. The results demonstrate that the surfactant-coated PEP could help to deliver loperamide across the BBB.
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Affiliation(s)
- Yung-Chu Chen
- Tissue Regeneration Product Technology Division, Industrial Technology Research Institute, Hsinchu 31040, Taiwan
| | - Wen-Yuan Hsieh
- Tissue Regeneration Product Technology Division, Industrial Technology Research Institute, Hsinchu 31040, Taiwan
| | - Wen-Fu Lee
- Department of Chemical Engineering, Tatung University, Taipei 104, Taiwan
| | - Ding-Tai Zeng
- Department of Chemical Engineering, Tatung University, Taipei 104, Taiwan
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Surface modification of poly(lactide-co-glycolide) nanoparticles by d-α-tocopheryl polyethylene glycol 1000 succinate as potential carrier for the delivery of drugs to the brain. Colloids Surf A Physicochem Eng Asp 2011. [DOI: 10.1016/j.colsurfa.2011.10.012] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Makadia HK, Siegel SJ. Poly Lactic-co-Glycolic Acid (PLGA) as Biodegradable Controlled Drug Delivery Carrier. Polymers (Basel) 2011; 3:1377-1397. [PMID: 22577513 DOI: 10.3390/polym3031377] [Citation(s) in RCA: 2532] [Impact Index Per Article: 194.8] [Reference Citation Analysis] [Abstract] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
In past two decades poly lactic-co-glycolic acid (PLGA) has been among the most attractive polymeric candidates used to fabricate devices for drug delivery and tissue engineering applications. PLGA is biocompatible and biodegradable, exhibits a wide range of erosion times, has tunable mechanical properties and most importantly, is a FDA approved polymer. In particular, PLGA has been extensively studied for the development of devices for controlled delivery of small molecule drugs, proteins and other macromolecules in commercial use and in research. This manuscript describes the various fabrication techniques for these devices and the factors affecting their degradation and drug release.
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Affiliation(s)
- Hirenkumar K Makadia
- Materials Science and Engineering, University of Pennsylvania, Philadelphia, PA 19104, USA
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Jwala J, Boddu SHS, Shah S, Sirimulla S, Pal D, Mitra AK. Ocular sustained release nanoparticles containing stereoisomeric dipeptide prodrugs of acyclovir. J Ocul Pharmacol Ther 2011; 27:163-72. [PMID: 21500985 DOI: 10.1089/jop.2010.0188] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
PURPOSE The objective of this study was to develop and characterize polymeric nanoparticles of appropriate stereoisomeric dipeptide prodrugs of acyclovir (L-valine-L-valine-ACV, L-valine-D-valine-ACV, D-valine-L-valine-ACV, and D-valine-D-valine-ACV) for the treatment of ocular herpes keratitis. METHODS Stereoisomeric dipeptide prodrugs of acyclovir (ACV) were screened for bioreversion in various ocular tissues, cell proliferation, and uptake across the rabbit primary corneal epithelial cell line. Docking studies were carried out to examine the affinity of prodrugs to the peptide transporter protein. Prodrugs with optimum characteristics were selected for the preparation of nanoparticles using various grades of poly (lactic-co-glycolic acid) (PLGA). Nanoparticles were characterized for the entrapment efficiency, surface morphology, size distribution, and in vitro release. Further, the effect of thermosensitive gels on the release of prodrugs from nanoparticles was also studied. RESULTS L-valine-L-valine-ACV and L-valine-D-valine-ACV were considered to be optimum in terms of enzymatic stability, uptake, and cytotoxicity. Docking results indicated that L-valine in the terminal position increases the affinity of the prodrugs to the peptide transporter protein. Entrapment efficiency values of L-valine-L-valine-ACV and L-valine-D-valine-ACV were found to be optimal with PLGA 75:25 and PLGA 65:35 polymers, respectively. In vitro release of prodrugs from nanoparticles exhibited a biphasic release behavior with initial burst phase followed by sustained release. Dispersion of nanoparticles in thermosensitive gels completely eliminated the burst release phase. CONCLUSION Novel nanoparticulate systems of dipeptide prodrugs of ACV suspended in thermosensitive gels may provide sustained delivery after topical administration.
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Affiliation(s)
- Jwala Jwala
- Division of Pharmaceutical Sciences, School of Pharmacy, University of Missouri-Kansas City, 2464 Charlotte Street, Kansas City, MO 64108, USA
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Chang G, Ci T, Yu L, Ding J. Enhancement of the fraction of the active form of an antitumor drug topotecan via an injectable hydrogel. J Control Release 2011; 156:21-7. [PMID: 21777632 DOI: 10.1016/j.jconrel.2011.07.008] [Citation(s) in RCA: 111] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2011] [Revised: 06/14/2011] [Accepted: 07/05/2011] [Indexed: 11/29/2022]
Abstract
Poly(D,L-lactic acid-co-glycolic acid)-b-poly(ethylene glycol)-b-poly(D,L-lactic acid-co-glycolic acid) (PLGA-PEG-PLGA) hydrogels were tried as implants to encapsulate antitumor drug topotecan (TPT), a derivative of camptothecin (CPT). Despite of water solubility of TPT, the in vitro release of this low-molecular-weight drug from hydrogels sustained for 5 days with only a mild initial burst. The antitumor efficacy of the released TPT was further validated in S180-bearing mice. Surprisingly, the fraction of the active lactone form of TPT was increased to above 50% in the hydrogel matrix, while the fraction was just about 10% in phosphate buffer saline under physiological pH at 37°C. This significant effect was interpreted not by the local acidic pH within the hydrogel, but by the increase of pK(a) of the carboxylate group of the open-ring form due to the hydrophobic interaction between the amphiphilic polymer and TPT. Theoretical analysis via a pK(a)-related mechanism was also performed, which was consistent with our experimental measurements. Hence, this study has revealed that an appropriate biomaterial could, via drug-material interactions, enhance the drug efficacy by increasing the active fraction of some drugs which exhibit a reversible conversion between the active and inactive structures.
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Affiliation(s)
- Guangtao Chang
- Key Laboratory of Molecular Engineering of Polymers, Ministry of Education, Department of Macromolecular Science, Laboratory of Advanced Materials, Fudan University, Shanghai, China
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Boddu SHS, Jwala J, Chowdhury MR, Mitra AK. In vitro evaluation of a targeted and sustained release system for retinoblastoma cells using Doxorubicin as a model drug. J Ocul Pharmacol Ther 2011; 26:459-68. [PMID: 20874666 DOI: 10.1089/jop.2010.0048] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
PURPOSE The objective of this study was to develop a novel folate receptor-targeted drug delivery system for retinoblastoma cells using doxorubicin (DOX) as a model drug. METHODS Biodegradable DOX-loaded poly(d,l-lactide-co-glycolide)-poly(ethylene glycol)-folate (PLGA-PEG-FOL) micelles (DOXM) were prepared with various solvents (dimethylsulfoxide, acetone, and dimethylformamide). The effects of solvents on entrapment efficiency, particle size, and polydispersity were examined. The effects of thermosensitive gel structure on the release of DOX from the DOXM were also studied. Qualitative and quantitative uptake studies of DOX and DOXM were carried out in Y-79 cell line. Cytotoxicity studies of DOXM were performed on Y-79 cells. RESULTS Based on size, polydispersity, and entrapment efficiency, dimethylformamide was found to be the most suitable solvent for the preparation of DOXM. Dispersion of DOXM in PLGA-PEG-PLGA gel sustained drug release for a period of 2 weeks. Uptake of DOX was ∼4 times higher with DOXM than DOX in Y-79 cells overexpressing folate receptors. This was further confirmed from the quantitative uptake studies. DOXM exhibited higher cytotoxicity in Y-79 cells when compared with pure DOX. CONCLUSION These polymeric micellar systems suspended in thermosensitive gels may provide sustained and targeted delivery of anticancer agents to retinoblastoma cells following intravitreal administration.
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Affiliation(s)
- Sai H S Boddu
- Division of Pharmaceutical Sciences, School of Pharmacy, University of Missouri-Kansas City , Kansas City, MO 64108-2718, USA
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Biodegradable Polymeric Assemblies for Biomedical Materials. POLYMERS IN NANOMEDICINE 2011. [DOI: 10.1007/12_2011_160] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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Waknis V, Jonnalagadda S. Novel poly-DL-lactide-polycaprolactone copolymer based flexible drug delivery system for sustained release of ciprofloxacin. Drug Deliv 2010; 18:236-45. [DOI: 10.3109/10717544.2010.528070] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Boddu SHS, Jwala J, Vaishya R, Earla R, Karla PK, Pal D, Mitra AK. Novel nanoparticulate gel formulations of steroids for the treatment of macular edema. J Ocul Pharmacol Ther 2010; 26:37-48. [PMID: 20148659 DOI: 10.1089/jop.2009.0074] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
PURPOSE This article describes the development and characterization of PLGA nanoparticles of dexamethasone (DEX), hydrocortisone acetate (HA), and prednisolone acetate (PA) suspended in thermosensitive gels indicated for the treatment of macular edema (ME). METHODS Nanoparticles were prepared by oil-in-water (O/W) emulsion and dialysis methods using PLGA 50:50 and PLGA 65:35. These particles were characterized for entrapment efficiency, size distribution, surface morphology, crystallinity, and in vitro release. Further, ex vivo permeation studies of DEX in suspension and nanoparticulate formulations were carried out across the rabbit sclera. RESULTS Entrapment efficiencies of DEX, HA, and PA were found to be lower with the dialysis method. O/W emulsion/solvent evaporation technique resulted in higher entrapment efficiencies, that is, 77.3%, 91.3%, 92.3% for DEX, HA, and PA, respectively. Release from nanoparticles suspended in thermosensitive gels followed zero-order kinetics with no apparent burst effect. Ex vivo permeability studies further confirmed sustained release of DEX from nanoparticles suspended in thermosensitive gels. CONCLUSIONS These novel nanoparticulate systems containing particles suspended in thermosensitive gels may provide sustained retina/choroid delivery of steroids following episcleral administration.
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Affiliation(s)
- Sai H S Boddu
- Division of Pharmaceutical Sciences, School of Pharmacy, University of Missouri-Kansas City, Kansas City, Missouri 64108-2718, USA
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Slomkowski S. Functionalized Biodegradable Nano- and Microspheres for Medical Applications. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/masy.201050216] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Tai H, Wang W, Vermonden T, Heath F, Hennink WE, Alexander C, Shakesheff KM, Howdle SM. Thermoresponsive and photocrosslinkable PEGMEMA-PPGMA-EGDMA copolymers from a one-step ATRP synthesis. Biomacromolecules 2010; 10:822-8. [PMID: 19226106 DOI: 10.1021/bm801308q] [Citation(s) in RCA: 66] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Thermoresponsive and photocrosslinkable polymers can be used as injectable scaffolds in tissue engineering to yield gels in situ with enhanced mechanical properties and stability. They allow easy handling and hold their shapes prior to photopolymerization for clinical practice. Here we report a novel copolymer with both thermoresponsive and photocrosslinkable properties via a facile one-step deactivation enhanced atom transfer radical polymerization (ATRP) using poly(ethylene glycol) methyl ether methylacrylate (PEGMEMA, M(n) = 475) and poly(propylene glycol) methacrylate (PPGMA, M(n) = 375) as monofunctional vinyl monomers and up to 30% of ethylene glycol dimethacrylate (EGDMA) as multifunctional vinyl monomer. The resultant PEGMEMA-PPGMA-EGDMA copolymers have been characterized by gel permeation chromatography (GPC) and 1H NMR analysis, which demonstrate their multivinyl functionality and hyperbranched structures. These water-soluble copolymers show lower critical solution temperature (LCST) behavior at 32 degrees C, which is comparable to poly(N-isopropylacrylamide) (PNIPAM). The copolymers can also be cross-linked by photopolymerization through their multivinyl functional groups. Rheological studies clearly demonstrate that the photocrosslinked gels formed at a temperature above the LCST have higher storage moduli than those prepared at a temperature below the LCST. Moreover, the cross-linking density of the gels can be tuned to tailor their porous structures and mechanical properties by adjusting the composition and concentration of the copolymers. Hydrogels with a broad range of storage moduli from 10 to 400 kPa have been produced.
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Affiliation(s)
- Hongyun Tai
- School of Chemistry, The University of Nottingham, University Park, Nottingham, NG7 2RD, United Kingdom.
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The effect of poloxamer 188 on nanoparticle morphology, size, cancer cell uptake, and cytotoxicity. NANOMEDICINE-NANOTECHNOLOGY BIOLOGY AND MEDICINE 2010; 6:170-8. [DOI: 10.1016/j.nano.2009.05.004] [Citation(s) in RCA: 168] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/03/2008] [Revised: 04/13/2009] [Accepted: 05/04/2009] [Indexed: 11/30/2022]
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Abstract
Although the potential benefits of gene therapy for the treatment of acquired and inherited genetic diseases have been demonstrated through preclinical studies, the results of human gene therapy trials have been disappointing. Recombinant viruses are the primary vectors of choice because of their ability to protect genetic materials, cross cellular membranes, escape from endosomes and transport their genetic materials into the nucleus. Unfortunately, viral vectors have been unable to gain widespread clinical application because of their toxicity and immunogenicity. Consequently, the need for safer alternatives has led to the development of liposomes, cationic polyplexes, microparticles and nanoparticles. Although these alternative vectors have shown promise, degradable nanoparticles are the only non-viral vectors that can provide a targeted intracellular delivery with controlled release properties. Furthermore, the potential advantage of degradable nanoparticles over their non-degradable counterparts is the reduced toxicity and the avoidance of accumulation within the target tissue after repeated administration. In this article, current non-viral gene delivery devices are reviewed with a special emphasis on nanoparticle gene delivery systems. Also, the authors highlight their philosophy and efforts on the development of l-tyrosine-based polyphosphate nanoparticle-based non-viral gene delivery systems and assess the potential benefits and shortcomings of their approach.
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Affiliation(s)
- Andrew J Ditto
- The University of Akron, Sidney Olson Research Center, Department of Biomedical Engineering, Akron, OH 44325, USA
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