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Ryu WM, Kim SN, Min CH, Choy YB. Dry Tablet Formulation of PLGA Nanoparticles with a Preocular Applicator for Topical Drug Delivery to the Eye. Pharmaceutics 2019; 11:pharmaceutics11120651. [PMID: 31817173 PMCID: PMC6955998 DOI: 10.3390/pharmaceutics11120651] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2019] [Revised: 11/28/2019] [Accepted: 12/02/2019] [Indexed: 12/30/2022] Open
Abstract
To enhance ocular drug bioavailability, a rapidly dissolving dry tablet containing alginate and drug-loaded poly(lactic-co-glycolic acid) (PLGA) nanoparticles was proposed. For hygienic and easy administration of an accurate drug-dose with this tablet, the use of a preocular applicator was suggested. Herein, a dry tablet was prepared by embedding dexamethasone-loaded PLGA nanoparticles in alginate, which was deposited on the tip of the applicator. The nanoparticles were loaded with 85.45 μg/mg drug and exhibited sustained drug release for 10 h. To evaluate in vivo efficacy, dexamethasone concentration in the aqueous humor was measured after topical administration of the dry tablet, with the applicator, to rabbit eyes and was compared to that achieved with Maxidex®, a commercially-available dexamethasone eye drops. When applied with the preocular applicator, the dry tablet containing alginate could be fully detached and delivered to the eye surface. In fact, it showed up to 2 h of nanoparticle retention on the preocular surface due to tear viscosity enhancement, causing an estimated 2.6-fold increase in ocular drug bioavailability compared to Maxidex®. Therefore, the preocular applicator combined with a dry alginate tablet containing PLGA nanoparticles can be a promising system for aseptically delivering an accurate dose of ophthalmic drug with enhanced bioavailability.
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Affiliation(s)
- Woo Mi Ryu
- Interdisciplinary Program in Bioengineering, College of Engineering, Seoul National University, Seoul 08826, Korea; (W.M.R.); (C.H.M.)
| | - Se-Na Kim
- Institute of Medical & Biological Engineering, Medical Research Center, Seoul National University, Seoul 03080, Korea;
| | - Chang Hee Min
- Interdisciplinary Program in Bioengineering, College of Engineering, Seoul National University, Seoul 08826, Korea; (W.M.R.); (C.H.M.)
| | - Young Bin Choy
- Interdisciplinary Program in Bioengineering, College of Engineering, Seoul National University, Seoul 08826, Korea; (W.M.R.); (C.H.M.)
- Institute of Medical & Biological Engineering, Medical Research Center, Seoul National University, Seoul 03080, Korea;
- Department of Biomedical Engineering, Seoul National University College of Medicine, Seoul 03080, Korea
- Correspondence: ; Tel.: +82-2-740-8592
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Covert JC, Thomasy SM, Kado-Fong H, Kon LN, Kass PH, Reilly CM, Lappin MR, Margulies BJ, Maggs DJ. Pilot Study of the Safety and Tolerability of a Subconjunctival Penciclovir Implant in Cats Experimentally Infected with Herpesvirus. J Ocul Pharmacol Ther 2019; 35:38-49. [DOI: 10.1089/jop.2018.0043] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Affiliation(s)
- Jill C. Covert
- Department of Surgical and Radiological Sciences, University of California-Davis, Davis, California
| | - Sara M. Thomasy
- Department of Surgical and Radiological Sciences, University of California-Davis, Davis, California
- Veterinary Medical Teaching Hospital, University of California-Davis, Davis, California
| | - Helen Kado-Fong
- Department of Surgical and Radiological Sciences, University of California-Davis, Davis, California
| | - Leslie N. Kon
- Department of Surgical and Radiological Sciences, University of California-Davis, Davis, California
| | - Philip H. Kass
- Department of Population Health and Reproduction, and University of California-Davis, Davis, California
| | - Christopher M. Reilly
- Department of Pathology Microbiology and Immunology, University of California-Davis, Davis, California
| | - Michael R. Lappin
- Department of Clinical Sciences, College of Veterinary Medicine and Biomedical Sciences, Colorado State University, Fort Collins, Colorado
| | - Barry J. Margulies
- Towson University Herpes Virus Laboratory, Department of Biological Sciences, Towson University, Towson, Maryland
| | - David J. Maggs
- Department of Surgical and Radiological Sciences, University of California-Davis, Davis, California
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Polymer-based carriers for ophthalmic drug delivery. J Control Release 2018; 285:106-141. [DOI: 10.1016/j.jconrel.2018.06.031] [Citation(s) in RCA: 74] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2018] [Revised: 06/23/2018] [Accepted: 06/25/2018] [Indexed: 12/22/2022]
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Ratay ML, Glowacki AJ, Balmert SC, Acharya AP, Polat J, Andrews LP, Fedorchak MV, Schuman JS, Vignali DAA, Little SR. Treg-recruiting microspheres prevent inflammation in a murine model of dry eye disease. J Control Release 2017; 258:208-217. [PMID: 28501670 PMCID: PMC7805562 DOI: 10.1016/j.jconrel.2017.05.007] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2016] [Accepted: 05/07/2017] [Indexed: 01/14/2023]
Abstract
Dry eye disease (DED) is a common ocular disorder affecting millions of individuals worldwide. The pathology of DED involves the infiltration of CD4+ lymphocytes, leading to tear film instability and destructive inflammation. In the healthy steady state, a population of immunosuppressive T-cells called regulatory T-cells (Treg) regulates proliferation of immune cells that would otherwise lead to a disruption of immunological homeostasis. For this reason, it has been suggested that Tregs could restore the immunological imbalance in DED. To this end, one possible approach would be to recruit the body's own, endogenous Tregs in order to enrich them at the site of inflammation and tissue destruction. Previously, we have demonstrated a reduction of inflammation and disease symptoms in models of periodontitis corresponding to recruitment of endogenous Tregs, which was accomplished by local placement of controlled release systems that sustain a gradient of the chemokine CCL22, referred to here as Treg-recruiting microspheres. Given that DED is characterized by a pro-inflammatory environment resulting in local tissue destruction, we hypothesized that the controlled release of CCL22 could also recruit Tregs to the ocular surface potentially mediating inflammation and symptoms of DED. Indeed, data suggest that Treg-recruiting microspheres are capable of overcoming the immunological imbalance of Tregs and CD4+ IFN-γ+ cells in the lacrimal gland. Administration of Treg-recruiting microspheres effectively mitigated the symptoms of DED as measured through a number of outcomes such as tear clearance, goblet cells density and corneal epithelial integrity, suggesting that recruitment of endogenous Treg can mitigate inflammation associated with DED.
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Affiliation(s)
- Michelle L Ratay
- Department of Bioengineering, University of Pittsburgh, Pittsburgh, PA 15216, United States
| | - Andrew J Glowacki
- Department of Chemical Engineering, University of Pittsburgh, Pittsburgh, PA 15216, United States
| | - Stephen C Balmert
- Department of Bioengineering, University of Pittsburgh, Pittsburgh, PA 15216, United States
| | - Abhinav P Acharya
- Department of Chemical Engineering, University of Pittsburgh, Pittsburgh, PA 15216, United States
| | - Julia Polat
- Department of Ophthalmology, University of Pittsburgh School of Medicine, Pittsburgh, PA 15213, United States; Fox Center for Vision Restoration, University of Pittsburgh School of Medicine, Pittsburgh, PA 15213, United States
| | - Lawrence P Andrews
- Department of Immunology, University of Pittsburgh School of Medicine, Pittsburgh, PA 15260, United States
| | - Morgan V Fedorchak
- Department of Bioengineering, University of Pittsburgh, Pittsburgh, PA 15216, United States; Department of Ophthalmology, University of Pittsburgh School of Medicine, Pittsburgh, PA 15213, United States; Fox Center for Vision Restoration, University of Pittsburgh School of Medicine, Pittsburgh, PA 15213, United States
| | - Joel S Schuman
- Department of Ophthalmology, University of Pittsburgh School of Medicine, Pittsburgh, PA 15213, United States; Fox Center for Vision Restoration, University of Pittsburgh School of Medicine, Pittsburgh, PA 15213, United States
| | - Dario A A Vignali
- Department of Immunology, University of Pittsburgh School of Medicine, Pittsburgh, PA 15260, United States; Department of Tumor Microenvironment Center, University of Pittsburgh Cancer Institute, Pittsburgh, PA 15232, United States
| | - Steven R Little
- Department of Bioengineering, University of Pittsburgh, Pittsburgh, PA 15216, United States; Department of Chemical Engineering, University of Pittsburgh, Pittsburgh, PA 15216, United States; Department of Ophthalmology, University of Pittsburgh School of Medicine, Pittsburgh, PA 15213, United States; Department of Immunology, University of Pittsburgh School of Medicine, Pittsburgh, PA 15260, United States.
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Felice B, Prabhakaran MP, Zamani M, Rodríguez AP, Ramakrishna S. Electrosprayed poly(vinyl alcohol) particles: preparation and evaluation of their drug release profile. POLYM INT 2015. [DOI: 10.1002/pi.4972] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Betiana Felice
- Laboratorio de Medios e Interfases (LAMEIN), Departamento de Bioingeniería; Facultad de Ciencias Exactas y Tecnología, Universidad Nacional de Tucumán; Tucumán Argentina
- Instituto Superior de Investigaciones Biológicas (INSIBIO); CONICET 4000 Tucumán Argentina
- START - Thrust 3, Create Research Wing 03-08, 1 Create Way; National University of Singapore; Singapore 138602
| | - Molamma P Prabhakaran
- START - Thrust 3, Create Research Wing 03-08, 1 Create Way; National University of Singapore; Singapore 138602
- Department of Mechanical Engineering; National University of Singapore; Singapore
| | - Maedeh Zamani
- START - Thrust 3, Create Research Wing 03-08, 1 Create Way; National University of Singapore; Singapore 138602
- Department of Mechanical Engineering; National University of Singapore; Singapore
| | - Andrea P Rodríguez
- Laboratorio de Medios e Interfases (LAMEIN), Departamento de Bioingeniería; Facultad de Ciencias Exactas y Tecnología, Universidad Nacional de Tucumán; Tucumán Argentina
- Instituto Superior de Investigaciones Biológicas (INSIBIO); CONICET 4000 Tucumán Argentina
| | - Seeram Ramakrishna
- START - Thrust 3, Create Research Wing 03-08, 1 Create Way; National University of Singapore; Singapore 138602
- Department of Mechanical Engineering; National University of Singapore; Singapore
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Park CG, Kim MJ, Park M, Choi SY, Lee SH, Lee JE, Shin GS, Park KH, Choy YB. Nanostructured mucoadhesive microparticles for enhanced preocular retention. Acta Biomater 2014; 10:77-86. [PMID: 23978409 DOI: 10.1016/j.actbio.2013.08.026] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2013] [Revised: 08/02/2013] [Accepted: 08/14/2013] [Indexed: 01/22/2023]
Abstract
We describe nanostructured microparticles (NMs) containing a mucoadhesive polymer for enhanced preocular retention and consider them as potential carriers of drugs to the eye. These NMs are each composed of entangled nanofibers to give an enlarged specific surface area, and thus can better adhere to the preocular mucus surface. This physical design allows the microparticles still to be composed mainly of a wall material, poly(lactic-co-glycolic acid), as required for controlled drug delivery, while the effects of an additive, mucoadhesive material, polyethylene glycol, can be synergistically improved via the nanostructured morphology. Thus, when formulated in a dry tablet dosage form, the NMs in this work show more than a 10-fold increase in preocular retention in vivo compared to conventional spherical microparticles. Therefore, we conclude that these mucoadhesive NMs can reside on the preocular surface for a prolonged period, and thus appear to be a promising system for topical drug delivery to the eye.
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Affiliation(s)
- Chun Gwon Park
- Interdisciplinary Program in Bioengineering, College of Engineering, Seoul National University, Seoul 152-742, Republic of Korea
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Sultana S, Talegaonkar S, Singh D, Ahmad R, Manukonda V, Bhatnagar A, Ahmad FJ. An approach for lacidipine loaded gastroretentive formulation prepared by different methods for gastroparesis in diabetic patients. Saudi Pharm J 2013; 21:293-304. [PMID: 23960846 DOI: 10.1016/j.jsps.2013.03.005] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2013] [Accepted: 03/29/2013] [Indexed: 02/06/2023] Open
Abstract
The present work deals with various attempts to prepare a gastroretentive formulation of lacidipine for treating gastroparesis. High density sucrose beads were modified by coating with certain polymers, but unfortunately sustained release could not be achieved. Granules were prepared by wet granulation technology using different combinations of polymers and a release of the drug was observed. The method failed to release the drug as per desired specifications. Polymeric coating followed by wet granulation was thought to be a better process to sustain the dissolution rate. The release rate can be modified by the incorporation of different polymeric coatings, but the mucoadhesive potential of granules was only 4.23% which might be due to its large size and the presence of other ingredients. Further, the lacidipine loaded microparticles were prepared by different methods such as compression, ionic gelation with TPP, ionic gelation with TPP and glutaraldehyde, spray drying and coacervation techniques. The formulations were evaluated for average particle size, surface morphology, entrapment efficiency, % yield and mucoadhesive potential. The microparticles prepared by compression method using HPMC K4M and SCMC as mucoadhesive polymers and BaSO4 as high density diluent showed poor bioadhesion (8.3%) and poor release characteristics (100% in 120 min). Ionic gelation with tripolyphosphate yielded microspheres with poor mechanical strength. In order to improve its mechanical strength, TPP ionic gelation was combined with step-wise cross-linking with glutaraldehyde. The additional solidification step to improve mechanical strength left this procedure tedious, time consuming and cytotoxic. Spray drying method gave a very low yield with 46.67% bioadhesion. The method using CaCl2 for ionotropic gelation showed the best results with regard to physical characteristics (well formed discrete, spherical surface microcapsule), particle size (88.57 ± 0.51), in vitro bioadhesion (67.33%), yield (>85%) and loading (>70%).
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Affiliation(s)
- Shaheen Sultana
- Jamia Hamdard, Faculty of Pharmacy, Department of Pharmaceutics, Delhi, India
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Tataru G, Popa M, Costin D, Desbrieres J. Microparticles based on natural and synthetic polymers for ophthalmic applications. J Biomed Mater Res A 2012; 100:1209-20. [PMID: 22344747 DOI: 10.1002/jbm.a.34069] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2011] [Revised: 11/03/2011] [Accepted: 11/17/2011] [Indexed: 11/09/2022]
Abstract
Sodium salt of carboxymethylcellulose/poly(vinyl alcohol) particles suitable for application in ocular drug administration were prepared by crosslinking with epichlorohydrin in an alkaline medium, in reverse emulsion. The influence of parameters related with the particles elaboration process (ratio between polymer mixture and crosslinking agent, concentration of polymer solution, duration of crosslinking reaction, stirring intensity, etc.) based on their composition, size, and swelling ability was studied. Obtained microparticles fulfill the requirements for biomaterials-they are formed from biocompatible polymers; the acute toxicity value (LD(50)) is high enough to consider these materials as weakly toxic (hence able to introduce within the organism); they are able to include and release drugs in a controlled way. The in vivo adrenalin ocular delivery from the microparticles was tested on voluntary human patient. The particles showed good adhesion properties without irritation to the patient and proved the capability to treat the ocular congestion.
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Affiliation(s)
- G Tataru
- Faculty of Chemical Engineering and Protection of the Environment, Department of Natural and Synthetic Polymers, Technical University Gheorghe Asachi of Iasi, Iasi, Romania
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