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Dolinina ES, Akimsheva EY, Parfenyuk EV. Effects of synthesis conditions and release medium pH on release properties of acyclovir - mercaptopropyl modified silica composite. Drug Dev Ind Pharm 2022; 47:1624-1632. [PMID: 35107404 DOI: 10.1080/03639045.2022.2037627] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
OBJECTIVE The purpose of the present study was to evaluate the prospect of use of mercaptopropyl modified silica as a platform for development of new oral formulation of antiviral drug acyclovir (ACV) which is able to control release of the drug irrespective of release medium pH. METHODS The composites of ACV with mercaptopropyl modified silica were synthesized using sol-gel technology under different conditions (synthesis pH, drug loading). The composites were characterized using scanning electron microscopy, dynamic light scattering and differential scanning calorimetry methods. The effects of the synthesis conditions on physicochemical properties of the prepared composites and their release properties were studied. RESULTS The sol-gel synthesis conditions and release medium pH influence significantly release properties of the composites. The influence was explained by contributions of different factors, such as the drug-silica interactions in the composites, structure of the silica matrix and its stability in release media, hydrophobic nature of ACV, its pH-dependent solubility. It was found that all the synthesized composites followed the zero-order kinetics which is controlled by anomalous diffusion. CONCLUSION The studies showed that the composites exhibited controlled release of ACV up to 80 h.However, the release properties of the drug depend significantly on pH of release medium, i.e. the release properties (the release rate, the amount of released ACV) will change during transition of the composites through various segments of GIT. Therefore, the synthesized composites are not a promising basis for development of new oral dosage form of ACV.
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Affiliation(s)
| | | | - Elena V Parfenyuk
- G.A. Krestov Institute of Solution Chemistry of Russian Academy of Sciences
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2
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Sabbagh F, Muhamad II, Niazmand R, Dikshit PK, Kim BS. Recent progress in polymeric non-invasive insulin delivery. Int J Biol Macromol 2022; 203:222-243. [PMID: 35101478 DOI: 10.1016/j.ijbiomac.2022.01.134] [Citation(s) in RCA: 41] [Impact Index Per Article: 20.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2021] [Revised: 01/04/2022] [Accepted: 01/20/2022] [Indexed: 12/12/2022]
Abstract
The design of carriers for insulin delivery has recently attracted major research attentions in the biomedical field. In general, the release of drug from polymers is driven via a variety of polymers. Several mechanisms such as matrix release, leaching of drug, swelling, and diffusion are usually adopted for the release of drug through polymers. Insulin is one of the most predominant therapeutic drugs for the treatment of both diabetes mellitus; type-I (insulin-dependent) and type II (insulin-independent). Currently, insulin is administered subcutaneously, which makes the patient feel discomfort, pain, hyperinsulinemia, allergic responses, lipodystrophy surrounding the injection area, and occurrence of miscarried glycemic control. Therefore, significant research interest has been focused on designing and developing new insulin delivery technologies to control blood glucose levels and time, which can enhance the patient compliance simultaneously through alternative routes as non-invasive insulin delivery. The aim of this review is to emphasize various non-invasive insulin delivery mechanisms including oral, transdermal, rectal, vaginal, ocular, and nasal. In addition, this review highlights different smart stimuli-responsive insulin delivery systems including glucose, pH, enzymes, near-infrared, ultrasound, magnetic and electric fields, and the application of various polymers as insulin carriers. Finally, the advantages, limitations, and the effect of each non-invasive route on insulin delivery are discussed in detail.
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Affiliation(s)
- Farzaneh Sabbagh
- Department of Chemical Engineering, Chungbuk National University, Cheongju, Chungbuk 28644, Republic of Korea
| | - Ida Idayu Muhamad
- Universiti Teknologi Malaysia, Department of Chemical Engineering, 81310, Johor, Malaysia
| | - Razieh Niazmand
- Department of Food Chemistry, Research Institute of Food Science and Technology, Mashhad, Iran
| | - Pritam Kumar Dikshit
- Department of Biotechnology, Koneru Lakshmaiah Education Foundation, Vaddeswaram, Guntur 522 502, Andhra Pradesh, India
| | - Beom Soo Kim
- Department of Chemical Engineering, Chungbuk National University, Cheongju, Chungbuk 28644, Republic of Korea.
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3
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Law S, Leung AW, Xu C. Folic acid-modified celastrol nanoparticles: synthesis, characterization, anticancer activity in 2D and 3D breast cancer models. ARTIFICIAL CELLS NANOMEDICINE AND BIOTECHNOLOGY 2020; 48:542-559. [PMID: 32054336 DOI: 10.1080/21691401.2020.1725025] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
Celastrol is used in traditional Chinese medicine for treating cancers. However, its low water solubility and poor tumour selection represent major pitfalls for clinical application. In the present study, gold nanoparticle (AuNP) firstly was conjugated with PVP-co-2-dimethylaminoethyl methacrylate (Polymer) and celastrol then modified by folic acid. The as-prepared folate receptor-targeted celastrol AuNP (FCA) was characterized using attenuated total reflection Fourier transform infrared spectroscopy, UV-Vis spectrometry, transmission electron microscope, and inductively coupled plasma mass spectrometry. The physical properties of FCA were also determined in solubility, drug encapsulation and in vitro drug release. Its anticancer activities were assessed in the 2D and 3D breast cancer models. The results showed that FCA was synthesized successfully with good solubility, high encapsulation efficiency and loading content. FCA showed the optimal cumulative release at pH 5.0 and high cellular uptake and exhibited significant inhibition on breast cancer cells. FCA also induced more significant apoptosis either in 2D and 3D breast cancer model than the celastrol AuNP and celastrol alone. These findings demonstrate that FCA improves water solubility of celastrol and enhances its anticancer activities against breast cancer. FCA might be a potential candidate of anticancer drug for breast cancer in the future if further development.
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Affiliation(s)
- Siukan Law
- Key Laboratory of Molecular Target and Clinical Pharmacology, State Key Laboratory of Respiratory Disease, School of Pharmaceutical Sciences and Fifth Affiliated Hospital, Guangzhou Medical University, Guangzhou, China.,School of Chinese Medicine, Faculty of Medicine, The Chinese University of Hong Kong, Shatin, Hong Kong.,Department of Science, School of Science and Technology, The Open University of Hong Kong, Kowloon, Hong Kong
| | | | - Chuanshan Xu
- Key Laboratory of Molecular Target and Clinical Pharmacology, State Key Laboratory of Respiratory Disease, School of Pharmaceutical Sciences and Fifth Affiliated Hospital, Guangzhou Medical University, Guangzhou, China
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4
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Collagen-based scaffolds with infused anti-VEGF release system as potential cornea substitute for high-risk keratoplasty: A preliminary in vitro evaluation. Heliyon 2020; 6:e05105. [PMID: 33033763 PMCID: PMC7533359 DOI: 10.1016/j.heliyon.2020.e05105] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2020] [Revised: 08/30/2020] [Accepted: 09/25/2020] [Indexed: 12/13/2022] Open
Abstract
Currently the only widely accepted corneal blindness treatment is human donor cornea transplantation. However, increasing shortage of donor corneas as well as high risk of rejection in some corneal diseases remain two major problems, which limit the success of corneal transplantation. Corneal neovascularization is considered as one of the main risk factors of graft failure. Different cell-free biosynthetic scaffolds fabricated from collagens or collagen-like peptides are being tested as donor cornea substitutes (DCS). Here, we report for the first-time composite biosynthetic DCS with integrated sustained release system of anti-VEGF drug, bevacizumab and their preliminary in vitro validation. We have tethered gold nanoparticles with bevacizumab and integrated into a collagen-based cell-free hydrogel scaffold. Developed grafts preserved good optical properties and were confirmed not toxic to human corneal epithelial cells. Bevacizumab has been shown to constantly releasing from the DCS up to 3 weeks and preserved its anti-angiogenic properties. These results provide background for further use of infused composite biosynthetic DCS with integrated nanosystem of bevacizumab sustained release in corneal disease accompanied by neovascularisation where conventional corneal transplantation might fail.
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5
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Akimsheva E, Dolinina E, Parfenyuk E. Interactions of sol-gel encapsulated acyclovir with silica matrix. Colloids Surf B Biointerfaces 2019; 178:103-110. [DOI: 10.1016/j.colsurfb.2019.02.052] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2018] [Revised: 02/06/2019] [Accepted: 02/26/2019] [Indexed: 10/27/2022]
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6
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Lee E, Nguyen CTH, Strounina E, Davis-Poynter N, Ross BP. Structure-Activity Relationships of GAG Mimetic-Functionalized Mesoporous Silica Nanoparticles and Evaluation of Acyclovir-Loaded Antiviral Nanoparticles with Dual Mechanisms of Action. ACS OMEGA 2018; 3:1689-1699. [PMID: 30023813 PMCID: PMC6045419 DOI: 10.1021/acsomega.7b01662] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/28/2017] [Accepted: 01/24/2018] [Indexed: 05/20/2023]
Abstract
Mesoporous silica nanoparticles (MSNs) are drug delivery agents that are able to incorporate drugs within their pores. Furthermore, MSNs can be functionalized by attachment of bioactive ligands on their surface to enhance their activity, and nanoparticles modified with glycosaminoglycan (GAG) mimetics inhibit the entry of herpes simplex virus (HSV) into cells. In this study, structure-activity relationships of GAGs attached to MSNs were investigated in relation to HSV-1 and HSV-2, and acyclovir was loaded into the pores of MSNs. The sulfonate group was demonstrated to be essential for antiviral activity, which was enhanced by incorporating a benzene group within the ligand. Loading acyclovir into GAG mimetic-functionalized MSNs reduced the viral infection, resulting in nanoparticles that simultaneously target two distinct viral pathways, namely, inhibition of viral entry and inhibition of DNA replication.
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Affiliation(s)
- Edward
C. Lee
- School
of Pharmacy and Centre for Advanced Imaging, The University
of Queensland, Brisbane, Queensland 4072, Australia
| | - Chau T. H. Nguyen
- School
of Pharmacy and Centre for Advanced Imaging, The University
of Queensland, Brisbane, Queensland 4072, Australia
| | - Ekaterina Strounina
- School
of Pharmacy and Centre for Advanced Imaging, The University
of Queensland, Brisbane, Queensland 4072, Australia
| | - Nicholas Davis-Poynter
- Centre
for Children’s Health Research, The
University of Queensland, 46 Graham Street, Brisbane, Queensland 4101, Australia
| | - Benjamin P. Ross
- School
of Pharmacy and Centre for Advanced Imaging, The University
of Queensland, Brisbane, Queensland 4072, Australia
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7
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Brunette I, Roberts CJ, Vidal F, Harissi-Dagher M, Lachaine J, Sheardown H, Durr GM, Proulx S, Griffith M. Alternatives to eye bank native tissue for corneal stromal replacement. Prog Retin Eye Res 2017; 59:97-130. [DOI: 10.1016/j.preteyeres.2017.04.002] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2016] [Revised: 04/15/2017] [Accepted: 04/21/2017] [Indexed: 12/13/2022]
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8
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Acrylamide-based hydrogel drug delivery systems: Release of Acyclovir from MgO nanocomposite hydrogel. J Taiwan Inst Chem Eng 2017. [DOI: 10.1016/j.jtice.2016.11.032] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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9
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Ramyadevi D, Rajan KS, Vedhahari BN, Ruckmani K, Subramanian N. Heterogeneous polymer composite nanoparticles loaded in situ gel for controlled release intra-vaginal therapy of genital herpes. Colloids Surf B Biointerfaces 2016; 146:260-70. [PMID: 27351137 DOI: 10.1016/j.colsurfb.2016.06.022] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2016] [Revised: 05/23/2016] [Accepted: 06/14/2016] [Indexed: 10/21/2022]
Abstract
Herpes simplex virus causes serious and contagious genital infections in high percentage of female population world-wide. Acyclovir is a clinically successful antiviral molecule till date, in-spite of limitations as poor solubility, low half-life, reduced oral bioavailability and side effects at higher doses. In the present work, controlled release in situ gelling system loaded with polymeric nanoparticles of acyclovir containing a dose of drug equivalent to 105mg/day has been developed. The formulation containing drug loaded polyvinyl pyrrolidone-Eudragit RSPO hybrid polymeric nanoparticles (Size ∼99±3nm, Zeta ∼+26.1±1.5mV) in 15% Pluronic F-127 gel exhibited improved permeability through vaginal membrane (KP=2.20±0.19×10(-6)cm/s). The nanoparticles showed enhanced viability for vaginal epithelial cell lines up to concentration of 100-250μg/mL. The formulation was evaluated for bioavailability and biodistribution through intra-vaginal administration in rat models. The nanoparticle in situ gel formulation maintained an average therapeutic drug level of 0.6±0.2μg/mL in plasma for 24h. Significant improvement in mean residence time of the drug (12.52±1.12h) was observed with a two-fold increase in the relative bioavailability (AUC0-24h=14.92±2.44μgh/mL) compared to that of the pure drug (7.18±1.79μgh/mL). The tissue distribution was 2-3 folds higher in animals treated with nanoparticles in situ gel compared to that of pure drug. Sustained release of drug in vivo was demonstrated, ensuring the suitability of the formulation for clinical therapy in female population.
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Affiliation(s)
- D Ramyadevi
- School of Chemical and Biotechnology (SCBT), SASTRA University, Thanjavur, 613 401 Tamil Nadu, India.
| | - K S Rajan
- School of Chemical and Biotechnology (SCBT), SASTRA University, Thanjavur, 613 401 Tamil Nadu, India.
| | - B N Vedhahari
- School of Chemical and Biotechnology (SCBT), SASTRA University, Thanjavur, 613 401 Tamil Nadu, India.
| | - K Ruckmani
- Department of Pharmaceutical Technology, Anna University, BIT Campus, Trichy, 620 024 Tamil Nadu, India.
| | - N Subramanian
- Department of Pharmaceutical Technology, Anna University, BIT Campus, Trichy, 620 024 Tamil Nadu, India.
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10
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Yu T, Rajendran V, Griffith M, Forrester JV, Kuffová L. High-risk corneal allografts: A therapeutic challenge. World J Transplant 2016; 6:10-27. [PMID: 27011902 PMCID: PMC4801785 DOI: 10.5500/wjt.v6.i1.10] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/03/2015] [Revised: 10/03/2015] [Accepted: 12/04/2015] [Indexed: 02/05/2023] Open
Abstract
Corneal transplantation is the most common surgical procedure amongst solid organ transplants with a high survival rate of 86% at 1-year post-grafting. This high success rate has been attributed to the immune privilege of the eye. However, mechanisms originally thought to promote immune privilege, such as the lack of antigen presenting cells and vessels in the cornea, are challenged by recent studies. Nevertheless, the immunological and physiological features of the cornea promoting a relatively weak alloimmune response is likely responsible for the high survival rate in “low-risk” settings. Furthermore, although corneal graft survival in “low-risk” recipients is favourable, the prognosis in “high-risk” recipients for corneal graft is poor. In “high-risk” grafts, the process of indirect allorecognition is accelerated by the enhanced innate and adaptive immune responses due to pre-existing inflammation and neovascularization of the host bed. This leads to the irreversible rejection of the allograft and ultimately graft failure. Many therapeutic measures are being tested in pre-clinical and clinical studies to counter the immunological challenge of “high-risk” recipients. Despite the prevailing dogma, recent data suggest that tissue matching together with use of systemic immunosuppression may increase the likelihood of graft acceptance in “high-risk” recipients. However, immunosuppressive drugs are accompanied with intolerance/side effects and toxicity, and therefore, novel cell-based therapies are in development which target host immune cells and restore immune homeostasis without significant side effect of treatment. In addition, developments in regenerative medicine may be able to solve both important short comings of allotransplantation: (1) graft rejection and ultimate graft failure; and (2) the lack of suitable donor corneas. The advances in technology and research indicate that wider therapeutic choices for patients may be available to address the worldwide problem of corneal blindness in both “low-risk” and “high-risk” hosts.
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11
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Slaney AM, Dijke IE, Jeyakanthan M, Li C, Zou L, Plaza-Alexander P, Meloncelli PJ, Bau JA, Allan LL, Lowary TL, West LJ, Cairo CW, Buriak JM. Conjugation of A and B Blood Group Structures to Silica Microparticles for the Detection of Antigen-Specific B Cells. Bioconjug Chem 2016; 27:705-15. [PMID: 26816334 DOI: 10.1021/acs.bioconjchem.5b00672] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Silica microparticles were functionalized with A and B blood group carbohydrate antigens (A type I, A type II, B type I, and B type II) to enable the detection and monitoring of ABO antigen-specific B cells. Microparticles were prepared via the Stöber synthesis, labeled with an Alexafluor fluorescent dye, and characterized via TEM and fluorescence microscopy. The silica microparticles were functionalized with (3-aminopropyl)trimethoxysilane (APTMS), followed by the use of an established fluorenylmethyloxycarbonyl (Fmoc)-protected PEG-based linker. The terminal Fmoc moiety of the PEG-based linker was then deprotected, yielding free amino groups, to which the A and B antigens were coupled. The carbohydrate antigens were synthesized with a p-nitrophenol ester to enable conjugation to the functionalized silica microparticles via an amide bond. The number of free amine groups available for coupling for a given mass of PEG-functionalized silica microparticles was quantified via reaction with Fmoc-glycine. The antigen-functionalized microparticles were then evaluated for their specificity in binding to A and B antigen-reactive B-cells via flow cytometry, and for blocking of naturally occurring antibodies in human serum. Selective binding of the functionalized microparticles to blood group-reactive B cells was observed by flow cytometry and fluorescence microscopy. The modular approach outlined here is applicable to the preparation of silica microparticles containing any carbohydrate antigen and alternative fluorophores or labels. This approach therefore comprises a novel, general platform for screening B cell populations for binding to carbohydrate antigens, including, in this case, the human A and B blood group antigens.
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Affiliation(s)
- Anne M Slaney
- National Institute for Nanotechnology (NINT), National Research Council , 11421 Saskatchewan Drive, Edmonton, Alberta, Canada T6G 2M9
| | | | | | | | | | | | | | - Jeremy A Bau
- National Institute for Nanotechnology (NINT), National Research Council , 11421 Saskatchewan Drive, Edmonton, Alberta, Canada T6G 2M9
| | - Lenka L Allan
- Pathology and Laboratory Medicine, Faculty of Medicine, Vancouver General Hospital, JP Pavilion North, University of British Columbia , 855 West 12th Avenue, Vancouver, British Columbia, Canada V5Z 1M9
| | | | | | | | - Jillian M Buriak
- National Institute for Nanotechnology (NINT), National Research Council , 11421 Saskatchewan Drive, Edmonton, Alberta, Canada T6G 2M9
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Szczubiałka K, Pyrć K, Nowakowska M. In search for effective and definitive treatment of herpes simplex virus type 1 (HSV-1) infections. RSC Adv 2016. [DOI: 10.1039/c5ra22896d] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
Abstract
Herpes Simplex Virus type 1 (HSV-1) is a nuclear replicating enveloped virus.
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Affiliation(s)
| | - Krzysztof Pyrć
- Faculty of Biochemistry, Biophysics and Biotechnology
- Jagiellonian University
- 30-387 Kraków
- Poland
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13
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Ramyadevi D, Rajan K. Interaction and release kinetics study of hybrid polymer blend nanoparticles for pH independent controlled release of an anti-viral drug. J Taiwan Inst Chem Eng 2015. [DOI: 10.1016/j.jtice.2014.12.036] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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14
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Yin P, Huang GB, Tse WH, Bao YG, Denstedt J, Zhang J. Nanocomposited silicone hydrogels with a laser-assisted surface modification for inhibiting the growth of bacterial biofilm. J Mater Chem B 2015; 3:3234-3241. [DOI: 10.1039/c4tb01871k] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Compared to the commercial silicone catheters, the nanocomposited silicone hydrogel with a laser-assisted surface modification can reduce the growth of bacteria from 1.20 × 106 CFU cm−2 to 3.69 × 105 CFU cm−2, almost an order of magnitude.
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Affiliation(s)
- P. Yin
- Department of Chemical and Biochemical Engineering
- University of Western Ontario
- London
- Canada
| | - G. B. Huang
- Department of Chemical and Biochemical Engineering
- University of Western Ontario
- London
- Canada
| | - W. H. Tse
- Department of Medical Biophysics
- University of Western Ontario
- London
- Canada
| | - Y. G. Bao
- Department of Surgery in the Schulich School of Medicine & Dentistry
- University of Western Ontario
- London
- Canada
| | - J. Denstedt
- Department of Surgery in the Schulich School of Medicine & Dentistry
- University of Western Ontario
- London
- Canada
| | - J. Zhang
- Department of Chemical and Biochemical Engineering
- University of Western Ontario
- London
- Canada
- Department of Medical Biophysics
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15
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Ramyadevi D, Rajan KS. Synthesis of hybrid polymer blend nanoparticles and incorporation into in situ gel foam spray for controlled release therapy using a versatile synthetic purine nucleoside analogue antiviral drug. RSC Adv 2015. [DOI: 10.1039/c4ra16537c] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Antiviral drug loaded nanoparticles is incorporated intoin situgel for controlled release therapy. Chemical and physical interactions of drug and polymers in the system influenced their characteristics and drug release mechanism.
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Affiliation(s)
- Durai Ramyadevi
- School of Chemical and Biotechnology (SCBT)
- SASTRA University
- Thanjavur – 613401
- India
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16
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Lee CJ, Buznyk O, Kuffova L, Rajendran V, Forrester JV, Phopase J, Islam MM, Skog M, Ahlqvist J, Griffith M. Cathelicidin LL-37 and HSV-1 Corneal Infection: Peptide Versus Gene Therapy. Transl Vis Sci Technol 2014; 3:4. [PMID: 24932432 DOI: 10.1167/tvst.3.3.4] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2013] [Accepted: 04/13/2014] [Indexed: 12/17/2022] Open
Abstract
PURPOSE To evaluate the potential utility of collagen-based corneal implants with anti-Herpes Simplex Virus (HSV)-1 activity achieved through sustained release of LL-37, from incorporated nanoparticles, as compared with cell-based delivery from model human corneal epithelial cells (HCECs) transfected to produce endogenous LL-37. METHODS We tested the ability of collagen-phosphorylcholine implants to tolerate the adverse microenvironment of herpetic murine corneas. Then, we investigated the efficacy of LL-37 peptides delivered through nanoparticles incorporated within the corneal implants to block HSV-1 viral activity. In addition, LL-37 complementary DNA (cDNA) was transferred into HCECs to confer viral resistance, and their response to HSV-1 infection was examined. RESULTS Our implants remained in herpetic murine corneas 7 days longer than allografts. LL-37 released from the implants blocked HSV-1 infection of HCECs by interfering with viral binding. However, in pre-infected HCECs, LL-37 delayed but could not prevent viral spreading nor clear viruses from the infected cells. HCECs transfected with the LL-37 expressed and secreted the peptide. Secreted LL-37 inhibited viral binding in vitro but was insufficient to protect cells completely from HSV-1 infection. Nevertheless, secreted LL-37 reduced both the incidence of plaque formation and plaque size. CONCLUSION LL-37 released from composite nanoparticle-hydrogel corneal implants and HCEC-produced peptide, both showed anti-HSV-1 activity by blocking binding. However, while both slowed down virus spread, neither was able on its own to completely inhibit the viruses. TRANSLATIONAL RELEVANCE LL-37 releasing hydrogels may have potential utility as corneal substitutes for grafting in HSV-1 infected corneas, possibly in combination with LL-37 producing therapeutic cells.
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Affiliation(s)
- Chyan-Jang Lee
- Integrative Regenerative Medicine Centre, Linköping University, Linköping, Sweden
| | - Oleksiy Buznyk
- Department of Eye Burns, Ophthalmic Reconstructive Surgery, Keratoplasty & Keratoprosthesis, Filatov Institute of Eye Diseases and Tissue Therapy, Odessa, Ukraine
| | - Lucia Kuffova
- Section of Immunity, Infection and Inflammation (3I's) (Ocular Immunology), Division of Applied Medicine, School of Medicine and Dentistry, University of Aberdeen, Aberdeen, Scotland
| | - Vijayalakshmi Rajendran
- Integrative Regenerative Medicine Centre, Linköping University, Linköping, Sweden ; Section of Immunity, Infection and Inflammation (3I's) (Ocular Immunology), Division of Applied Medicine, School of Medicine and Dentistry, University of Aberdeen, Aberdeen, Scotland
| | - John V Forrester
- Section of Immunity, Infection and Inflammation (3I's) (Ocular Immunology), Division of Applied Medicine, School of Medicine and Dentistry, University of Aberdeen, Aberdeen, Scotland
| | - Jaywant Phopase
- Integrative Regenerative Medicine Centre, Linköping University, Linköping, Sweden
| | - Mohammad M Islam
- Integrative Regenerative Medicine Centre, Linköping University, Linköping, Sweden
| | - Mårten Skog
- Integrative Regenerative Medicine Centre, Linköping University, Linköping, Sweden
| | | | - May Griffith
- Integrative Regenerative Medicine Centre, Linköping University, Linköping, Sweden
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Zhang J, Bi R, Hodge W, Yin P, Tse WH. A nanocomposite contact lens for the delivery of hydrophilic protein drugs. J Mater Chem B 2013; 1:4388-4395. [PMID: 32261112 DOI: 10.1039/c3tb20391c] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
To improve the efficiency of topical ocular drug administration, we developed a nanocomposite contact lens to deliver hydrophilic protein drugs over a prolonged period of time. Here, an in situ route was used to encapsulate the hydrophilic protein drug bovine serum albumin (BSA) within gelatin nanoparticles (NPs), 180 ± 20 nm in diameter, which were then grafted onto the lens material, a copolymer of 2-hydroxyethyl methacrylate and 2-aminoethyl methacrylate p(HEMA-co-AEMA), through photopolymerization. The thickness of the nanocomposite lens was controlled at 150 μm. The release kinetics of BSA from plain p(HEMA-co-AEMA), gelatin NPs, and gelatin NP-grafted p(HEMA-co-AEMA) in phosphate buffer saline (PBS) at pH = 7.4 were studied. The release profile of BSA encapsulated within gelatin NPs could be monitored for 7 days, three times longer than that of BSA soaked in p(HEMA-co-AEMA). Our findings indicate that use of the nanocomposite contact lens, i.e. BSA-loaded gelatin NPs incorporated into p(HEMA-co-AMEA), can prolong the release profile of BSA to 12 days. The swelling behavior and interior strain of p(HEMA-co-AEMA) with and without grafted NPs (1000 : 1 w/w) were further investigated. The nanocomposite lens shows higher swelling behavior than the plain p(HEMA-co-AEMA) lens does. The addition of gelatin NPs to hydrogels leads to a relatively uniform interior strain with lower stiffness. Thus, the prolonged release might be due to a combination of effects. Internal diffusion of the nanocomposite lens materials may significantly contribute to the prolonged release of protein drugs. Furthermore, the nanocomposite lens materials had no cytotoxicity. This new biocompatible nanocomposite might be further developed as an alternative tool for continuous topical ocular drug delivery over a prolonged period of time.
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Affiliation(s)
- Jin Zhang
- Department of Chemical and Biochemical Engineering, University of Western Ontario, London, Ontario N6A 5B7, Canada.
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Griffith M, Polisetti N, Kuffova L, Gallar J, Forrester J, Vemuganti GK, Fuchsluger TA. Regenerative approaches as alternatives to donor allografting for restoration of corneal function. Ocul Surf 2012; 10:170-83. [PMID: 22814644 DOI: 10.1016/j.jtos.2012.04.004] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2011] [Revised: 04/22/2012] [Accepted: 04/01/2012] [Indexed: 12/13/2022]
Abstract
A range of alternatives to human donor tissue for corneal transplantation are being developed to address the shortfall of good quality tissues as well as the clinical conditions for which allografting is contraindicated. Classical keratoprostheses, commonly referred to as artificial corneas, are being used clinically to replace minimal corneal function. However, they are used only as last resorts, as they are associated with significant complications, such as extrusion/rejection, glaucoma, and retinal detachment. The past few years have seen significant developments in technologies designed to replace part or the full thickness of damaged or diseased corneas with materials that encourage regeneration to different extents. This review describes selected examples of these corneal substitutes, which range from cell-based regenerative strategies to keratoprostheses with regenerative capabilities via tissue-engineered scaffolds pre-seeded with stem cells. It is unlikely that one corneal substitute will be best for all indications, but taken together, the various approaches may soon be able to supplement the supply of human donor corneas for transplantation or allow restoration of diseased or damaged corneas that cannot be treated by currently available techniques.
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Affiliation(s)
- May Griffith
- Integrative Regenerative Medicine Centre, Department of Clinical and Experimental Medicine, Linköping University, Sweden.
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