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Kim S, Jo H, Lee S, Yang M, Jun H, Lee Y, Kim GW, Lee D. Targeted echogenic and anti-inflammatory polymeric prodrug nanoparticles for the management of renal ischemia/reperfusion injury. J Control Release 2023; 363:574-584. [PMID: 37797890 DOI: 10.1016/j.jconrel.2023.10.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2023] [Revised: 09/20/2023] [Accepted: 10/02/2023] [Indexed: 10/07/2023]
Abstract
Ischemia/reperfusion (IR) injury is an inevitable pathological event occurring when blood is resupplied to the tissues after a period of ischemia. One of major causes of IR injury is the overproduction of reactive oxygen species (ROS) including hydrogen peroxide (H2O2), which mediates the expression of various inflammatory cytokines to exacerbate tissue damages. The overproduced H2O2 could therefore serve as a diagnostic and therapeutic biomarker of IR injury. In this study, poly(boronated methacrylate) (pBMA) nanoparticles were developed as nanotheranostic agents for renal IR injury, which not only generate CO2 bubbles to enhance the ultrasound contrast but also provide potent preventive effects in a H2O2-triggered manner. The surface of pBMA nanoparticles was decorated with taurodeoxycholic acid (TUDCA) that binds P-selectin overexpressed in inflamed tissues. In the mouse model of renal IR injury, TUDCA-coated pBMA (T-pBMA) nanoparticles preferentially accumulated in the injured kidney and markedly enhanced the ultrasound contrast. T-pBMA nanoparticles also effectively prevented renal IR injury by scavenging H2O2 and suppressing the expression of inflammatory cytokines. Treatment progress of IR injury could be also monitored by echogenic T-pBMA nanoparticles. Given their targeting ability, excellent H2O2-responsiveness, anti-inflammatory activity and H2O2-triggered echogenicity, T-pBMA nanoparticles have excellent translational potential for the management of various H2O2-related diseases including IR injury.
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Affiliation(s)
- Sooyeon Kim
- Department of Nanobiotechnology and Bioconvergence Engineering, Jeonbuk National University, Jeonju, Jeonbuk 54896, Republic of Korea
| | - Hanui Jo
- Department of Nanobiotechnology and Bioconvergence Engineering, Jeonbuk National University, Jeonju, Jeonbuk 54896, Republic of Korea
| | - Suyeon Lee
- Department of Nanobiotechnology and Bioconvergence Engineering, Jeonbuk National University, Jeonju, Jeonbuk 54896, Republic of Korea
| | - Manseok Yang
- Department of Nanobiotechnology and Bioconvergence Engineering, Jeonbuk National University, Jeonju, Jeonbuk 54896, Republic of Korea
| | - Hayoung Jun
- Department of Nanobiotechnology and Bioconvergence Engineering, Jeonbuk National University, Jeonju, Jeonbuk 54896, Republic of Korea
| | - Youngjong Lee
- Department of Nanobiotechnology and Bioconvergence Engineering, Jeonbuk National University, Jeonju, Jeonbuk 54896, Republic of Korea
| | - Gi-Wook Kim
- Department of Nanobiotechnology and Bioconvergence Engineering, Jeonbuk National University, Jeonju, Jeonbuk 54896, Republic of Korea; Department of Physical Medicine and Rehabilitation, Jeonbuk National University Medical School, Jeonju, Jeonbuk 54097, Republic of Korea
| | - Dongwon Lee
- Department of Nanobiotechnology and Bioconvergence Engineering, Jeonbuk National University, Jeonju, Jeonbuk 54896, Republic of Korea; Department of Polymer⋅Nano Science and Technology, Jeonbuk National University, Jeonju, Jeonbuk 54896, Republic of Korea.
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Alqahtani SM, Al Khulaifi RS, Alassaf M, Saeed WS, Bedja I, Aldarwesh A, Aljubailah A, Semlali A, Aouak T. Preparation and Characterization of Poly(vinyl Acetate-co-2-hydroxyethyl Methacrylate) and In Vitro Application as Contact Lens for Acyclovir Delivery. Int J Mol Sci 2023; 24:ijms24065483. [PMID: 36982556 PMCID: PMC10057064 DOI: 10.3390/ijms24065483] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2023] [Revised: 03/10/2023] [Accepted: 03/11/2023] [Indexed: 03/17/2023] Open
Abstract
A series of poly(vinyl acetate-co-2-hydroxyethylmethacrylate)/acyclovir drug carrier systems (HEMAVAC) containing different acyclovir contents was prepared through bulk free radical polymerization of 2-hydroxyethyl methacrylate with vinyl acetate (VAc) in presence of acyclovir (ACVR) as the drug using a LED lamp in presence of camphorquinone as the photoinitiator. The structure of the drug carrier system was confirmed by FTIR and 1HNMR analysis, and the uniform dispersion of the drug particles in the carrier was proved by DSC and XRD analysis. The study of the physico-chemical properties of the prepared materials, such as the transparency, swelling capacity, wettability and optical refraction, was carried out by UV–visible analysis, a swelling test and measurement of the contact angle and the refractive index, respectively. The elastic modulus and the yield strength of the wet prepared materials were examined by dynamic mechanical analysis. The cytotoxicity of the prepared materials and cell adhesion on these systems were studied by LDH assay and the MTT test, respectively. The results obtained were comparable to those of standard lenses with a transparency of 76.90–89.51%, a swelling capacity of 42.23–81.80% by weight, a wettability of 75.95–89.04 o, a refractive index of 1.4301–1.4526 and a modulus of elasticity of 0.67–1.50 MPa, depending on the ACVR content. It was also shown that these materials exhibit no significant cytotoxicity; on the other hand, they show significant cell adhesion. The in vitro dynamic release of ACVR in water revealed that the HEMAVAC drug carrier can consistently deliver uniformly adequate amounts of ACVR (5.04–36 wt%) over a long period (7 days) in two steps. It was also found that the solubility of ACVR obtained from the release process was improved by 1.4 times that obtained by direct solubility of the drug in powder form at the same temperature.
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Affiliation(s)
- Saad Mohammed Alqahtani
- Department of Chemistry, College of Science, King Saud University, Riyadh 11451, Saudi Arabia
| | - Rana Salem Al Khulaifi
- Department of Chemistry, College of Science, King Saud University, Riyadh 11451, Saudi Arabia
| | - Mohammed Alassaf
- Department of Chemistry, College of Science, King Saud University, Riyadh 11451, Saudi Arabia
| | - Waseem Sharaf Saeed
- Department of Chemistry, College of Science, King Saud University, Riyadh 11451, Saudi Arabia
| | - Idriss Bedja
- Department of Optometry, College of Applied Medical Sciences, King Saud University, Riyadh 11433, Saudi Arabia
| | - Amal Aldarwesh
- Department of Optometry, College of Applied Medical Sciences, King Saud University, Riyadh 11433, Saudi Arabia
| | - Abeer Aljubailah
- Department of Chemistry, College of Science, King Saud University, Riyadh 11451, Saudi Arabia
| | - Abdelhabib Semlali
- Groupe de Recherche en Écologie Buccale, Faculté de Médecine Dentaire, Université Laval, Quebec City, QC G1V 0A6, Canada
| | - Taieb Aouak
- Department of Chemistry, College of Science, King Saud University, Riyadh 11451, Saudi Arabia
- Correspondence:
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Naproxen-Loaded Poly(2-hydroxyalkyl methacrylates): Preparation and Drug Release Dynamics. Polymers (Basel) 2022; 14:polym14030450. [PMID: 35160440 PMCID: PMC8840337 DOI: 10.3390/polym14030450] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2021] [Revised: 01/15/2022] [Accepted: 01/20/2022] [Indexed: 11/16/2022] Open
Abstract
Poly(2-hydroxyethylmethacrylate)/Naproxen (NPX/pHEMA) and poly (2-hydroxypropyl methacrylate)/Naproxen (NPX/pHPMA) composites with different NPX content were prepared in situ by free radical photopolymerization route. The resulted hybrid materials were characterized by Fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), scanning Electron microscopy (SEM), and X-ray diffraction (XRD). These composites have been studied as drug carrier systems, in which a comparison of the in vitro release dynamic of NPX between the two drug carrier systems has been conducted. Different factors affecting the performance of the release dynamic of this drug, such as the amount of Naproxen incorporated in the drug carrier system, the pH of the medium and the degree of swelling, have been investigated. The results of the swelling study of pHEMA and pHPMA in different media pHs revealed that the diffusion of water molecules through both polymer samples obeys the Fickian model. The “in vitro” study of the release dynamic of Naproxen from NPX/pHEMA and NPX/pHPMA drug carrier systems revealed that the higher percentage of NPX released was obtained from each polymer carrier in neutral pH medium, and the diffusion of NPX trough these polymer matrices also obeys the Fickian model. It was also found that the less the mass percent of NPX in the composites, the better its release will be. The comparison between the two drug carrier systems revealed that the pHEMA leads to the best performance in the release dynamic of NPX. Regarding Naproxen solubility in water, the results deducted from the “in vitro” study of NPX/pHEMA10 and NPX/pHPMA10 drug carrier systems revealed a very significant improvement in the solubility of NPX in media pH1 (2.33 times, 1.43 times) and 7 (3.32 times, 2.60 times), respectively, compared to those obtained by direct dissolution of Naproxen powder.
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Kasza K, Gurnani P, Hardie KR, Cámara M, Alexander C. Challenges and solutions in polymer drug delivery for bacterial biofilm treatment: A tissue-by-tissue account. Adv Drug Deliv Rev 2021; 178:113973. [PMID: 34530014 DOI: 10.1016/j.addr.2021.113973] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2021] [Revised: 08/12/2021] [Accepted: 09/08/2021] [Indexed: 02/07/2023]
Abstract
To tackle the emerging antibiotic resistance crisis, novel antimicrobial approaches are urgently needed. Bacterial communities (biofilms) are a particular concern in this context. Biofilms are responsible for most human infections and are inherently less susceptible to antibiotic treatments. Biofilms have been linked with several challenging chronic diseases, including implant-associated osteomyelitis and chronic wounds. The specific local environments present in the infected tissues further contribute to the rise in antibiotic resistance by limiting the efficacy of systemic antibiotic therapies and reducing drug concentrations at the infection site, which can lead to reoccurring infections. To overcome the shortcomings of systemic drug delivery, encapsulation within polymeric carriers has been shown to enhance antimicrobial efficacy, permeation and retention at the infection site. In this Review, we present an overview of current strategies for antimicrobial encapsulation within polymeric carriers, comparing challenges and solutions on a tissue-by-tissue basis. We compare challenges and proposed drug delivery solutions from the perspective of the local environments for biofilms found in oral, wound, gastric, urinary tract, bone, pulmonary, vaginal, ocular and middle/inner ear tissues. We will also discuss future challenges and barriers to clinical translation for these therapeutics. The following Review demonstrates there is a significant imbalance between the research focus being placed on different tissue types, with some targets (oral and wound biofims) being extensively more studied than others (vaginal and otitis media biofilms and endocarditis). Furthermore, the importance of the local tissue environment when selecting target therapies is demonstrated, with some materials being optimal choices for certain sites of bacterial infection, while having limited applicability in others.
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Therapeutic Hydrogel Lenses and the Antibacterial and Antibiotic Drugs Release. APPLIED SCIENCES-BASEL 2021. [DOI: 10.3390/app11041931] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The aim of this research was to evaluate the effects of different lens types on the availability and efficacy of anti-inflammatory and antibiotic drugs. Three lens types were examined: (1) nonionic hydrogel lenses; (2) ionic hydrogel lenses; and (3) silicone hydrogel lenses. The lenses were incubated with (a) dexamethasone; (b) betamethasone; (c) bromophenacyl bromide; and (d) chloramphenicol. Drug availability was quantified by gradient HPLC, and chloramphenicol antibacterial activity was quantified by testing the inhibition of Salmonella typhimurium growth on agar. The lens allowing the most abundant passage of betamethasone was the ionic hydrogel lens, followed by the silicone hydrogel lens and nonionic hydrogel lens. The lens allowing the most abundant passage of dexamethasone was the ionic hydrogel lens, but only at 0.5 h and 1 h. Regarding chloramphenicol, the ionic hydrogel lens and silicone hydrogel lens allowed more abundant passage than the nonionic hydrogel lens. These results highlight the relevance of adapting lenses to anti-inflammatory therapy, thus allowing a personalized medical approach.
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Sung YK, Kim SW. Recent advances in polymeric drug delivery systems. Biomater Res 2020; 24:12. [PMID: 32537239 PMCID: PMC7285724 DOI: 10.1186/s40824-020-00190-7] [Citation(s) in RCA: 238] [Impact Index Per Article: 59.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2020] [Accepted: 05/19/2020] [Indexed: 01/01/2023] Open
Abstract
BACKGROUND Polymeric drug delivery systems have been achieved great development in the last two decades. Polymeric drug delivery has defined as a formulation or a device that enables the introduction of a therapeutic substance into the body. Biodegradable and bio-reducible polymers make the magic possible choice for lot of new drug delivery systems. The future prospects of the research for practical applications has required for the development in the field. MAIN BODY Natural polymers such as arginine, chitosan, dextrin, polysaccharides, poly (glycolic acid), poly (lactic acid), and hyaluronic acid have been treated for polymeric drug delivery systems. Synthetic polymers such as poly (2-hydroxyethyl methacrylate), poly(N-isopropyl acrylamide)s, poly(ethylenimine)s, dendritic polymers, biodegradable and bio-absorbable polymers have been also discussed for polymeric drug delivery. Targeting polymeric drug delivery, biomimetic and bio-related polymeric systems, and drug-free macromolecular therapeutics have also treated for polymeric drug delivery. In polymeric gene delivery systems, virial vectors and non-virial vectors for gene delivery have briefly analyzed. The systems of non-virial vectors for gene delivery are polyethylenimine derivatives, polyethylenimine copolymers, and polyethylenimine conjugated bio-reducible polymers, and the systems of virial vectors are DNA conjugates and RNA conjugates for gene delivery. CONCLUSION The development of polymeric drug delivery systems that have based on natural and synthetic polymers are rapidly emerging to pharmaceutical fields. The fruitful progresses have made in the application of biocompatible and bio-related copolymers and dendrimers to cancer treatment, including their use as delivery systems for potent anticancer drugs. Combining perspectives from the synthetic and biological fields will provide a new paradigm for the design of polymeric drug and gene delivery systems.
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Affiliation(s)
- Yong Kiel Sung
- Department of Chemistry, College of Science, Dongguk University, Phildong-ro, Seoul, 04620 South Korea
- Department of Pharmaceutics and Pharmaceutical Chemistry, Center for Controlled Chemical Delivery, University of Utah, BPRB, Room 205, Salt Lake City, UT 84112 USA
| | - Sung Wan Kim
- Department of Pharmaceutics and Pharmaceutical Chemistry, Center for Controlled Chemical Delivery, University of Utah, BPRB, Room 205, Salt Lake City, UT 84112 USA
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Nguyen DD, Luo L, Lai J. Dendritic Effects of Injectable Biodegradable Thermogels on Pharmacotherapy of Inflammatory Glaucoma-Associated Degradation of Extracellular Matrix. Adv Healthc Mater 2019; 8:e1900702. [PMID: 31746141 DOI: 10.1002/adhm.201900702] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2019] [Revised: 10/25/2019] [Indexed: 01/01/2023]
Abstract
The development of advanced drug delivery systems with extensively sustained release and multiple functions is highly imperative for effective attenuation of the degradation of ocular extracellular matrix that is associated with inflammatory glaucoma. Here, the generation of amine-terminated polyamidoamine dendrimers in an injectable biodegradable thermogel is demonstrated to be important for achieving prolonged drug release profiles and potent anti-inflammatory effects. Among various generations (Gx, x = 0, 1, 3, 5), third-generation G3 is proved as the most effective material for optimizing the synergistic effects of gelatin and poly(N-isopropylacrylamide) and generating a thermogel with the highest biodegradation resistance, the best drug encapsulation/extended-release performance, and the best ability to reduce the elevated expression of inflammatory molecules. A pharmacotherapy based on intracameral injection of thermogels coloaded with pilocarpine and ascorbic acid results in effective alleviation of progressive glaucoma owing to the anti-inflammatory activity and long-acting drug release (above a therapeutic level of 10 µg mL-1 over 80 days) of thermogels, which simultaneously suppress inflammation and stimulate regeneration of stromal collagen and retinal laminin. These findings on the dendritic effects of rationally designed injectable biomaterials with potent anti-inflammatory effects and controlled drug release demonstrate great promise of their use for pharmacological treatment of progressive glaucoma.
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Affiliation(s)
- Duc Dung Nguyen
- Graduate Institute of Biomedical EngineeringChang Gung University Taoyuan 33302 Taiwan ROC
| | - Li‐Jyuan Luo
- Graduate Institute of Biomedical EngineeringChang Gung University Taoyuan 33302 Taiwan ROC
| | - Jui‐Yang Lai
- Graduate Institute of Biomedical EngineeringChang Gung University Taoyuan 33302 Taiwan ROC
- Department of OphthalmologyChang Gung Memorial Hospital, Linkou Taoyuan 33305 Taiwan ROC
- Department of Materials EngineeringMing Chi University of Technology New Taipei City 24301 Taiwan ROC
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Zhou H, Jiao H, Xu J, Liu Y, Wei S. Synthesis of poly hydroxypropyl methacrylate cryogel incorporated with Zn/Ce substituted hydroxyapatite nanoparticles for rejuvenation of femoral fracture treatment in a rat model. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 2019; 201:111651. [DOI: 10.1016/j.jphotobiol.2019.111651] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/30/2019] [Revised: 10/03/2019] [Accepted: 10/10/2019] [Indexed: 12/19/2022]
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9
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Hydrogel implants for transscleral drug delivery for retinoblastoma treatment. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2019; 103:109799. [DOI: 10.1016/j.msec.2019.109799] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/22/2019] [Revised: 04/18/2019] [Accepted: 05/26/2019] [Indexed: 02/07/2023]
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Cao H, Duan Y, Lin Q, Yang Y, Gong Z, Zhong Y, Chen X, Shao Z. Dual-loaded, long-term sustained drug releasing and thixotropic hydrogel for localized chemotherapy of cancer. Biomater Sci 2019; 7:2975-2985. [DOI: 10.1039/c9bm00540d] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
A thixotropic injectable regenerated silk fibroin/hydroxypropylcellulose (RSF/HPC) hydrogel for highly sustainable dual-drug release with improved anticancer therapy and alleviated side effects.
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Affiliation(s)
- Han Cao
- State Key Laboratory of Molecular Engineering of Polymers
- Department of Macromolecular Science
- Laboratory of Advanced Materials
- Fudan University
- Shanghai
| | - Yu Duan
- State Key Laboratory of Molecular Engineering of Polymers
- Department of Macromolecular Science
- Laboratory of Advanced Materials
- Fudan University
- Shanghai
| | - Qinrui Lin
- State Key Laboratory of Molecular Engineering of Polymers
- Department of Macromolecular Science
- Laboratory of Advanced Materials
- Fudan University
- Shanghai
| | - Yuhong Yang
- Research Center for Analysis and Measurement
- Fudan University
- Shanghai
- People's Republic of China
| | - Zuguang Gong
- State Key Laboratory of Molecular Engineering of Polymers
- Department of Macromolecular Science
- Laboratory of Advanced Materials
- Fudan University
- Shanghai
| | - Yiming Zhong
- Fuels and Energy Technology Institute & Department of Chemical Engineering
- Curtin University
- Perth
- Australia
| | - Xin Chen
- State Key Laboratory of Molecular Engineering of Polymers
- Department of Macromolecular Science
- Laboratory of Advanced Materials
- Fudan University
- Shanghai
| | - Zhengzhong Shao
- State Key Laboratory of Molecular Engineering of Polymers
- Department of Macromolecular Science
- Laboratory of Advanced Materials
- Fudan University
- Shanghai
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Choi SW, Kim J. Therapeutic Contact Lenses with Polymeric Vehicles for Ocular Drug Delivery: A Review. MATERIALS (BASEL, SWITZERLAND) 2018; 11:E1125. [PMID: 29966397 PMCID: PMC6073408 DOI: 10.3390/ma11071125] [Citation(s) in RCA: 56] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/04/2018] [Revised: 06/28/2018] [Accepted: 06/29/2018] [Indexed: 12/22/2022]
Abstract
The eye has many barriers with specific anatomies that make it difficult to deliver drugs to targeted ocular tissues, and topical administration using eye drops or ointments usually needs multiple instillations to maintain the drugs’ therapeutic concentration because of their low bioavailability. A drug-eluting contact lens is one of the more promising platforms for controllable ocular drug delivery, and, among various manufacturing methods for drug-eluting contact lenses, incorporation of novel polymeric vehicles with versatile features makes it possible to deliver the drugs in a sustained and extended manner. Using the diverse physicochemical properties of polymers for nanoparticles or implants that are selected according to the characteristics of drugs, enhancement of encapsulation efficiency and prolonged drug release are possible. Even though therapeutic contact lenses with polymeric vehicles allow us to achieve sustained ocular drug delivery, drug leaching during storage and distribution and the possibility of problems related to surface roughness due to the incorporated vehicles still need to be discussed before application in a real clinic. This review highlights the overall trends in methodology to develop therapeutic contact lenses with polymeric vehicles and discusses the limitations including comparison to cosmetically tinted soft contact lenses.
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Affiliation(s)
- Seung Woo Choi
- Department of Health Sciences and Technology, Samsung Advanced Institute for Health Sciences & Technology (SAIHST), Sungkyunkwan University (SKKU), Suwon 16419, Korea.
| | - Jaeyun Kim
- Department of Health Sciences and Technology, Samsung Advanced Institute for Health Sciences & Technology (SAIHST), Sungkyunkwan University (SKKU), Suwon 16419, Korea.
- School of Chemical Engineering, Sungkyunkwan University (SKKU), Suwon 16419, Korea.
- Biomedical Institute for Convergence at SKKU (BICS), Sungkyunkwan University (SKKU), Suwon 16419, Korea.
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Controlling Indomethacin Release through Vapor-Phase Deposited Hydrogel Films by Adjusting the Cross-linker Density. Sci Rep 2018; 8:7134. [PMID: 29739950 PMCID: PMC5940858 DOI: 10.1038/s41598-018-24238-w] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2017] [Accepted: 03/29/2018] [Indexed: 01/19/2023] Open
Abstract
Vapor-phase deposited polymer coatings are applied on thin indomethacin films to modify the drug release. Hydrogel-forming co-polymers of 2-hydroxyethyl methacrylate and ethylene glycol dimethacrylate were prepared directly on top of solution cast indomethacin thin films by initiated Chemical Vapor Deposition (iCVD). This technique allows for solvent-free processing under mild conditions, thus minimizing a potential impact on the pharmaceutical. The drug release behavior, among other properties, was evaluated for polymers of different compositions and at different temperatures. The data show that the release kinetics can be tuned by several orders of magnitude as the cross-linker fraction is varied in the polymer coating. While uncoated indomethacin films were fully released within an hour, polymer coatings showed gradual liberation over several hours to days. Additional insight is gained from evaluating the experimental dissolution data in the framework of diffusive transport. The results of this study show that the iCVD technique has some promises for pharmaceutical technology, potentially allowing for tailored release behavior also for other drug systems.
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Taddei P, Di Foggia M, Martinotti S, Ranzato E, Carmagnola I, Chiono V, Tsukada M. Silk fibres grafted with 2-hydroxyethyl methacrylate (HEMA) and 4-hydroxybutyl acrylate (HBA) for biomedical applications. Int J Biol Macromol 2018; 107:537-548. [DOI: 10.1016/j.ijbiomac.2017.09.023] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2017] [Revised: 09/08/2017] [Accepted: 09/10/2017] [Indexed: 02/08/2023]
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Shahbazi S, Zamanian A, Pazouki M, Jafari Y. Introducing an attractive method for total biomimetic creation of a synthetic biodegradable bioactive bone scaffold based on statistical experimental design. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2018. [PMID: 29525086 DOI: 10.1016/j.msec.2017.12.033] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
A new total biomimetic technique based on both the water uptake and degradation processes is introduced in this study to provide an interesting procedure to fabricate a bioactive and biodegradable synthetic scaffold, which has a good mechanical and structural properties. The optimization of effective parameters to scaffold fabrication was done by response surface methodology/central composite design (CCD). With this method, a synthetic scaffold was fabricated which has a uniform and open-interconnected porous structure with the largest pore size of 100-200μm. The obtained compressive ultimate strength of ~35MPa and compression modulus of 58MPa are similar to some of the trabecular bone. The pore morphology, size, and distribution of the scaffold were characterized using a scanning electron microscope and mercury porosimeter. Fourier transform infrared spectroscopy, EDAX and X-ray diffraction analyses were used to determine the chemical composition, Ca/P element ratio of mineralized microparticles, and the crystal structure of the scaffolds, respectively. The optimum biodegradable synthetic scaffold based on its raw materials of polypropylene fumarate, hydroxyethyl methacrylate and nano bioactive glass (PPF/HEMA/nanoBG) as 70/30wt/wt%, 20wt%, and 1.5wt/wt% (PHB.732/1.5) with desired porosity, pore size, and geometry were created by 4weeks immersion in SBF. This scaffold showed considerable biocompatibility in the ranging from 86 to 101% for the indirect and direct contact tests and good osteoblast cell attachment when studied with the bone-like cells.
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Affiliation(s)
- Sara Shahbazi
- Department of Nanotechnology and Advanced Materials, Materials and Energy Research Center, Karaj, Alborz, Iran
| | - Ali Zamanian
- Department of Nanotechnology and Advanced Materials, Materials and Energy Research Center, Karaj, Alborz, Iran.
| | - Mohammad Pazouki
- Department of Energy, Materials and Energy Research Center, Karaj, Alborz, Iran
| | - Yaser Jafari
- Department of Analytical Chemistry, Faculty of Chemistry, University of Kashan, Kashan, Iran
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Hernandez-Martínez A, Lujan-Montelongo J, Silva-Cuevas C, Mota-Morales JD, Cortez-Valadez M, Ruíz-Baltazar ÁDJ, Cruz M, Herrera-Ordonez J. Swelling and methylene blue adsorption of poly(N,N-dimethylacrylamide-co-2-hydroxyethyl methacrylate) hydrogel. REACT FUNCT POLYM 2018. [DOI: 10.1016/j.reactfunctpolym.2017.11.008] [Citation(s) in RCA: 57] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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16
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Kang B, Vales TP, Cho BK, Kim JK, Kim HJ. Development of Gallic Acid-Modified Hydrogels Using Interpenetrating Chitosan Network and Evaluation of Their Antioxidant Activity. Molecules 2017; 22:E1976. [PMID: 29140278 PMCID: PMC6150364 DOI: 10.3390/molecules22111976] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2017] [Revised: 11/04/2017] [Accepted: 11/13/2017] [Indexed: 02/07/2023] Open
Abstract
In this work, antioxidant hydrogels were prepared by the construction of an interpenetrating chitosan network and functionalization with gallic acid. The poly(2-hydroxyethyl methacrylate) p(HEMA)-based hydrogels were first synthesized and subsequently surface-modified with an interpenetrating polymer network (IPN) structure prepared with methacrylamide chitosan via free radical polymerization. The resulting chitosan-IPN hydrogels were surface-functionalized with gallic acid through an amide coupling reaction, which afforded the antioxidant hydrogels. Notably, gallic-acid-modified hydrogels based on a longer chitosan backbone exhibited superior antioxidant activity than their counterpart with a shorter chitosan moiety; this correlated to the amount of gallic acid attached to the chitosan backbone. Moreover, the surface contact angles of the chitosan-modified hydrogels decreased, indicating that surface functionalization of the hydrogels with chitosan-IPN increased the wettability because of the presence of the hydrophilic chitosan network chain. Our study indicates that chitosan-IPN hydrogels may facilitate the development of applications in biomedical devices and ophthalmic materials.
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Affiliation(s)
- Byungman Kang
- Nuclear Chemistry Research Division, Korea Atomic Energy Research Institute, 989-111 Daedeok-daero, Yuseong-gu, Daejeon 34057, Korea.
| | - Temmy Pegarro Vales
- Department of Chemistry, Chosun University, Gwangju 61452, Korea.
- Department of Natural Sciences, Caraga State University, Butuan City 8600, Philippines.
| | - Byoung-Ki Cho
- Department of Chemistry, Dankook University, 119, Dandae-ro, Chungnam 31116, Korea.
| | - Jong-Ki Kim
- Department of Biomedical Engineering, School of Medicine, Catholic University of Daegu, Daegu 42472, Korea.
| | - Ho-Joong Kim
- Department of Chemistry, Chosun University, Gwangju 61452, Korea.
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17
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Sugihara S, Yoshida A, Fujita S, Maeda Y. Design of Hydroxy-Functionalized Thermoresponsive Copolymers: Improved Direct Radical Polymerization of Hydroxy-Functional Vinyl Ethers. Macromolecules 2017. [DOI: 10.1021/acs.macromol.7b02084] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- Shinji Sugihara
- Department
of Applied Chemistry and Biotechnology, Graduate School of Engineering, University of Fukui, 3-9-1 Bunkyo, Fukui 910-8507, Japan
| | - Ayano Yoshida
- Department
of Applied Chemistry and Biotechnology, Graduate School of Engineering, University of Fukui, 3-9-1 Bunkyo, Fukui 910-8507, Japan
| | - Satoshi Fujita
- Department
of Frontier Fiber Technology and Science, Graduate School of Engineering, University of Fukui, 3-9-1 Bunkyo, Fukui 910-8507, Japan
| | - Yasushi Maeda
- Department
of Applied Chemistry and Biotechnology, Graduate School of Engineering, University of Fukui, 3-9-1 Bunkyo, Fukui 910-8507, Japan
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18
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Liao YT, Lee CH, Chen ST, Lai JY, Wu KCW. Gelatin-functionalized mesoporous silica nanoparticles with sustained release properties for intracameral pharmacotherapy of glaucoma. J Mater Chem B 2017; 5:7008-7013. [DOI: 10.1039/c7tb01217a] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Herein, pilocarpine-loaded gelatin-covered mesoporous silica nanoparticles (denoted as p/GM) were intracamerally administrated into the anterior chamber for the reduction of intraocular pressure (IOP).
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Affiliation(s)
- Yu-Te Liao
- Department of Chemical Engineering
- National Taiwan University
- Taipei 10617
- Taiwan
| | - Chih-Hung Lee
- Institute of Biochemical and Biomedical Engineering
- Chang Gung University
- Taoyuan 33302
- Taiwan
| | - Si-Tan Chen
- Institute of Biochemical and Biomedical Engineering
- Chang Gung University
- Taoyuan 33302
- Taiwan
| | - Jui-Yang Lai
- Institute of Biochemical and Biomedical Engineering
- Chang Gung University
- Taoyuan 33302
- Taiwan
- Department of Materials Engineering
| | - Kevin C.-W. Wu
- Department of Chemical Engineering
- National Taiwan University
- Taipei 10617
- Taiwan
- Division of Medical Engineering Research
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19
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Christian P, Ehmann HMA, Werzer O, Coclite AM. Wrinkle formation in a polymeric drug coating deposited via initiated chemical vapor deposition. SOFT MATTER 2016; 12:9501-9508. [PMID: 27841419 PMCID: PMC5315011 DOI: 10.1039/c6sm01919f] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/19/2016] [Accepted: 11/07/2016] [Indexed: 06/06/2023]
Abstract
Polymer encapsulation of drugs is conventionally used as a strategy for controlled delivery and enhanced stability. In this work, a novel encapsulation approach is demonstrated, in which the organic molecule clotrimazole is enclosed into wrinkles of defined sizes. Having defined wrinkles at the drug/encapsulant interface, the contact between the encapsulating polymer and the drug can be improved. In addition, this can also allow for some control on the drug delivery as the available surface area changes with the wrinkle size. For this purpose, thin films of clotrimazole were deposited onto silica substrates and were then encapsulated by crosslinked poly(2-hydroxyethyl methacrylate) (pHEMA) via initiated chemical vapor deposition (iCVD). The thickness and the solid state (crystalline or amorphous) of the clotrimazole layer were varied so that the conditions under which surface wrinkles emerge can be determined. A (critical) clotrimazole thickness of 76.6 nm was found necessary to induce wrinkles, whereby the wrinkle size is directly proportional to the thickness of the amorphous clotrimazole. When the pHEMA was deposited on top of crystalline clotrimazole instead, wrinkling was absent. The wrinkling effect can be understood in terms of elastic mismatch between the relatively rigid pHEMA film and the drug layer. In the case of amorphous clotrimazole, the relatively soft drug layer causes a large mismatch resulting in a sufficient driving force for wrinkle formation. Instead, the increased elastic modulus of crystalline clotrimazole reduces the elastic mismatch between drug and polymer, so that wrinkles do not form.
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Affiliation(s)
- Paul Christian
- Institute of Solid State Physics, NAWI Graz, Graz University of Technology, 8010 Graz, Austria.
| | - Heike M A Ehmann
- Institute of Pharmaceutical Science, Department of Pharmaceutical Technology, University of Graz, 8010 Graz, Austria and BioTechMed, Graz, Austria
| | - Oliver Werzer
- Institute of Pharmaceutical Science, Department of Pharmaceutical Technology, University of Graz, 8010 Graz, Austria and BioTechMed, Graz, Austria
| | - Anna Maria Coclite
- Institute of Solid State Physics, NAWI Graz, Graz University of Technology, 8010 Graz, Austria. and BioTechMed, Graz, Austria
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20
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Blakney AK, Little AB, Jiang Y, Woodrow KA. In vitro-ex vivo correlations between a cell-laden hydrogel and mucosal tissue for screening composite delivery systems. Drug Deliv 2016; 24:582-590. [PMID: 28222612 PMCID: PMC5594105 DOI: 10.1080/10717544.2016.1242178] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2016] [Accepted: 09/25/2016] [Indexed: 02/06/2023] Open
Abstract
Composite delivery systems where drugs are electrospun in different layers and vary the drug stacking-order are posited to affect bioavailability. We evaluated how the formulation characteristics of both burst- and sustained-release electrospun fibers containing three physicochemically diverse drugs: dapivirine (DPV), maraviroc (MVC) and tenofovir (TFV) affect in vitro and ex vivo release. We developed a poly(hydroxyethyl methacrylate) (pHEMA) hydrogel release platform for the rapid, inexpensive in vitro evaluation of burst- and sustained-release topical or dermal drug delivery systems with varying microarchitecture. We investigated properties of the hydrogel that could recapitulate ex vivo release into nonhuman primate vaginal tissue. Using a dimethyl sulfoxide extraction protocol and high-performance liquid chromatography analysis, we achieved >93% recovery from the hydrogels and >88% recovery from tissue explants for all three drugs. We found that DPV loading, but not stacking order (layers of fiber containing a single drug) or microarchitecture (layers with isolated drug compared to all drugs in the same layer) impacted the burst release in vitro and ex vivo. Our burst-release formulations showed a correlation for DPV accumulation between the hydrogel and tissue (R2= 0.80), but the correlation was not significant for MVC or TFV. For the sustained-release formulations, the PLGA/PCL content did not affect TFV release in vitro or ex vivo. Incorporation of cells into the hydrogel matrix improved the correlation between hydrogel and tissue explant release for TFV. We expect that this hydrogel-tissue mimic may be a promising preclinical model to evaluate topical or transdermal drug delivery systems with complex microarchitectures.
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Affiliation(s)
- Anna K. Blakney
- Department of Bioengineering, University of Washington, Seattle, WA, USA
| | - Adam B. Little
- Department of Bioengineering, University of Washington, Seattle, WA, USA
| | - Yonghou Jiang
- Department of Bioengineering, University of Washington, Seattle, WA, USA
| | - Kim A. Woodrow
- Department of Bioengineering, University of Washington, Seattle, WA, USA
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21
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Christian P, Ehmann H, Coclite AM, Werzer O. Polymer Encapsulation of an Amorphous Pharmaceutical by initiated Chemical Vapor Deposition for Enhanced Stability. ACS APPLIED MATERIALS & INTERFACES 2016; 8:21177-84. [PMID: 27467099 PMCID: PMC4999961 DOI: 10.1021/acsami.6b06015] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/20/2016] [Accepted: 07/28/2016] [Indexed: 05/22/2023]
Abstract
The usage of amorphous solids in practical applications, such as in medication, is commonly limited by the poor long-term stability of this state, because unwanted crystalline transitions occur. In this study, three different polymeric coatings are investigated for their ability to stabilize amorphous films of the model drug clotrimazole and to protect against thermally induced transitions. For this, drop cast films of clotrimazole are encapsulated by initiated chemical vapor deposition (iCVD), using perfluorodecyl acrylate (PFDA), hydroxyethyl methacrylate (HEMA), and methacrylic acid (MAA). The iCVD technique operates under solvent-free conditions at low temperatures, thus leaving the solid state of the encapsulated layer unaffected. Optical microscopy and X-ray diffraction data reveal that at ambient conditions of about 22 °C, any of these iCVD layers extends the lifetime of the amorphous state significantly. At higher temperatures (50 or 70 °C), the p-PFDA coating is unable to provide protection, while the p-HEMA and p-MAA strongly reduce the crystallization rate. Furthermore, p-HEMA and p-MAA selectively facilitate a preferential alignment of clotrimazole and, interestingly, even suppress crystallization upon a temporary, rapid temperature increase (3 °C/min, up to 150 °C). The results of this study demonstrate how a polymeric coating, synthesized directly on top of an amorphous phase, can act as a stabilizing agent against crystalline transitions, which makes this approach interesting for a variety of applications.
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Affiliation(s)
- Paul Christian
- Institute of Solid State Physics, NAWI Graz, Graz University of Technology, 8010 Graz, Austria
| | - Heike
M.A. Ehmann
- Institute of Pharmaceutical Science, Department of Pharmaceutical
Technology, University of Graz, 8010 Graz, Austria
| | - Anna Maria Coclite
- Institute of Solid State Physics, NAWI Graz, Graz University of Technology, 8010 Graz, Austria
| | - Oliver Werzer
- Institute of Pharmaceutical Science, Department of Pharmaceutical
Technology, University of Graz, 8010 Graz, Austria
- E-mail:
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22
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Chou SF, Luo LJ, Lai JY. Gallic acid grafting effect on delivery performance and antiglaucoma efficacy of antioxidant-functionalized intracameral pilocarpine carriers. Acta Biomater 2016; 38:116-28. [PMID: 27130273 DOI: 10.1016/j.actbio.2016.04.035] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2015] [Revised: 04/21/2016] [Accepted: 04/25/2016] [Indexed: 01/27/2023]
Abstract
UNLABELLED Functionalization of therapeutic carrier biomaterials can potentially provide additional benefits in drug delivery for disease treatment. Given that this modification determines final therapeutic efficacy of drug carriers, here, we investigate systematically the role of grafting amount of antioxidant gallic acid (GA) onto GN in situ gelling copolymers made of biodegradable gelatin and thermo-responsive poly(N-isopropylacrylamide) for intracameral delivery of pilocarpine in antiglaucoma treatment. As expected, increasing redox reaction time increased total antioxidant activities and free radical scavenging abilities of synthesized carrier biomaterials. The hydrophilic nature of antioxidant molecules strongly affected physicochemical properties of carrier materials with varying GA grafting amounts, thereby dictating in vitro release behaviors and mechanisms of pilocarpine. In vitro oxidative stress challenges revealed that biocompatible carriers with high GA content alleviated lens epithelial cell damage and reduced reactive oxygen species. Intraocular pressure and pupil diameter in glaucomatous rabbits showed correlations with GA-mediated release of pilocarpine. Additionally, enhanced pharmacological treatment effects prevented corneal endothelial cell loss during disease progression. Increasing GA content increased total antioxidant level and decreased nitrite level in the aqueous humor, suggesting a much improved antioxidant status in glaucomatous eyes. This work significantly highlights the dependence of physicochemical properties, drug release behaviors, and bioactivities on intrinsic antioxidant capacities of therapeutic carrier biomaterials for glaucoma treatment. STATEMENT OF SIGNIFICANCE Development of injectable biodegradable polymer depots and functionalization of carrier biomaterials with antioxidant can potentially provide benefits such as improved bioavailability, controlled release pattern, and increased therapeutic effect in intracameral pilocarpine administration for glaucoma treatment. For the first time, this study demonstrated that the biodegradable in situ gelling copolymers can incorporate different levels of antioxidant gallic acid to tailor the structure-property-function relationship of the intracameral drug delivery system. The systematic evaluation fully verified the dependence of phase transition, degradation behavior, drug release mechanism, and antiglaucoma efficacy on intrinsic antioxidant capacities of carrier biomaterials. The report highlights the significant role of grafting amount of gallic acid in optimizing performance of antioxidant-functionalized polymer therapeutics as new drug delivery platforms in disease treatment.
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23
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Chou SF, Luo LJ, Lai JY, Ma DHK. On the importance of Bloom number of gelatin to the development of biodegradable in situ gelling copolymers for intracameral drug delivery. Int J Pharm 2016; 511:30-43. [PMID: 27374201 DOI: 10.1016/j.ijpharm.2016.06.129] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2016] [Revised: 06/14/2016] [Accepted: 06/29/2016] [Indexed: 01/27/2023]
Abstract
To overcome the drawbacks associated with conventional antiglaucoma eye drops, this work demonstrated the feasibility of an effective alternative strategy to administer pilocarpine directly via intracameral injections of drug-containing biodegradable in situ gelling GN copolymers composed of gelatin and poly(N-isopropylacrylamide). Specifically, this study aims to understand the importance of Bloom number of gelatin, a physicochemical parameter, to the development of GN carriers for intracameral drug delivery in glaucoma therapy. Our results showed that both imino acid and triple-helix contents increased with increasing Bloom index from 75-100 to 300. The drug encapsulation efficiency in response to temperature-triggered phase transition in GN copolymers was affected by the Bloom index of gelatin. In addition, the differences in protein secondary structure significantly influenced the degradation rates of GN carriers, which were highly correlated with drug release profiles. The increase in released pilocarpine concentration led to a high intracellular calcium level in rabbit ciliary smooth muscle cell cultures, indicating a beneficial pharmacological response to a drug. Irrespective of Bloom number of gelatin, all carrier materials exhibited excellent in vitro and in vivo biocompatibility with corneal endothelium. In a glaucomatous rabbit model, intracameral injections of pilocarpine-containing GN synthesized from gelatins with various Bloom numbers had different abilities to improve ocular hypertension and induce pupillary constriction, indicating distinct antiglaucoma efficacies due to in vivo drug release. It is concluded that the effects on pharmacological treatment using GN carriers for intracameral pilocarpine administration demonstrate a strong dependence on the Bloom number of gelatin.
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Affiliation(s)
- Shih-Feng Chou
- Institute of Biochemical and Biomedical Engineering, Chang Gung University, Taoyuan, 33302, Taiwan, ROC; Department of Bioengineering, University of Washington, Seattle, WA 98195-5061, USA
| | - Li-Jyuan Luo
- Department of Chemical and Materials Engineering, Chang Gung University, Taoyuan 33302, Taiwan, ROC
| | - Jui-Yang Lai
- Institute of Biochemical and Biomedical Engineering, Chang Gung University, Taoyuan, 33302, Taiwan, ROC; Biomedical Engineering Research Center, Chang Gung University, Taoyuan 33302, Taiwan, ROC; Molecular Medicine Research Center, Chang Gung University, Taoyuan 33302, Taiwan, ROC; Center for Tissue Engineering, Chang Gung Memorial Hospital, Taoyuan 33305, Taiwan, ROC; Department of Ophthalmology, Chang Gung Memorial Hospital, Taoyuan 33305, Taiwan, ROC.
| | - David Hui-Kang Ma
- Center for Tissue Engineering, Chang Gung Memorial Hospital, Taoyuan 33305, Taiwan, ROC; Department of Ophthalmology, Chang Gung Memorial Hospital, Taoyuan 33305, Taiwan, ROC; Department of Chinese Medicine, Chang Gung University, Taoyuan 33302, Taiwan, ROC
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24
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Nasr FH, Khoee S, Dehghan MM, Chaleshtori SS, Shafiee A. Preparation and Evaluation of Contact Lenses Embedded with Polycaprolactone-Based Nanoparticles for Ocular Drug Delivery. Biomacromolecules 2016; 17:485-95. [DOI: 10.1021/acs.biomac.5b01387] [Citation(s) in RCA: 65] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Farzaneh Hashemi Nasr
- Polymer
Laboratory, Chemistry Department, School of Science, University of Tehran, P.O. Box 14155-6455, Tehran, Iran
| | - Sepideh Khoee
- Polymer
Laboratory, Chemistry Department, School of Science, University of Tehran, P.O. Box 14155-6455, Tehran, Iran
| | - Mohammad Mehdi Dehghan
- Institute
of Biomedical Research, Faculty of Veterinary Medicine, University of Tehran, Tehran, Iran
| | | | - Abbas Shafiee
- Department
of Medicinal Chemistry, Faculty of Pharmacy and Pharmaceutical Sciences
Research Center, Tehran University of Medical Sciences, Tehran 14176, Iran
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25
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Wen J, Yeh CK, Sun Y. Functionalized Denture Resins as Drug Delivery Biomaterials to Control Fungal Biofilms. ACS Biomater Sci Eng 2016; 2:224-230. [DOI: 10.1021/acsbiomaterials.5b00416] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Jianchuan Wen
- Department
of Chemistry, University of Massachusetts Lowell, 1 University
Avenue, Lowell, Massachusetts 01854, United States
| | - Chih-Ko Yeh
- Department
of Comprehensive Dentistry, University of Texas Health Science Center at San Antonio, and Geriatric Research Education and Clinical Center, Audie L. Murphy Division, South Texas Veterans Health Care System,
7400 Merton Minter Boulevard, San Antonio, Texas 78229, United States
| | - Yuyu Sun
- Department
of Chemistry, University of Massachusetts Lowell, 1 University
Avenue, Lowell, Massachusetts 01854, United States
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26
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Nalawade AC, Ghorpade RV, Shadbar S, Qureshi MS, Chavan NN, Khan AA, Ponrathnam S. Inverse high internal phase emulsion polymerization (i-HIPE) of GMMA, HEMA and GDMA for the preparation of superporous hydrogels as a tissue engineering scaffold. J Mater Chem B 2015; 4:450-460. [PMID: 32263209 DOI: 10.1039/c5tb01873k] [Citation(s) in RCA: 58] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
A series of novel superporous hydrogels for regenerative medicine were prepared by oil-in-water (o/w) or inverse high internal phase emulsion (i-HIPE) copolymerization of glycerol monomethacrylate (GMMA), 2-hydroxy ethyl methacrylate (HEMA) and glycerol dimethacrylate (GDMA) as a cross-linker using a non toxic solvent and a redox initiator system at the physiological temperature (37 °C). The monomer GMMA was synthesized from glycidyl methacrylate (GMA) by an alternative facile method using Amberlyst-15. The described i-HIPEs showed a significantly wider stability window. The polyHIPE hydrogels were characterized by FTIR, BET method for surface area, mercury porosimetry, SEM, DSC, TGA, XRD, compressive strain and strain recovery. The swelling ratio of the hydrogels and their degradation in 0.007 M NaOH and lipase B (Candida antarctica) solutions were determined gravimetrically and the rate of degradation was explained in terms of the molecular structure of the hydrogels. The morphological studies showed that the pore diameter varied between 20 and 30 μm and the pore throats (interconnecting windows) diameter was in the range of 4-8 μm. The described polyHIPE hydrogels were found to have an open cell morphology and interconnected pore architecture, which are important characteristics for scaffold applications. The initial cytotoxicity study performed according to ISO-10993-5 indicated cytocompatibility (97% cell viability) and the subsequent cell seeding and proliferation study exhibited 55-88% cell viability (increased monotonously from GHG-1 to GHG-5), which could be attributed to modulation of the physical and chemical properties of the hydrogels. The described super porous hydrogels are considered as potential candidates for scaffold materials in tissue engineering applications.
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Affiliation(s)
- Archana C Nalawade
- Chemical Engineering and Process Development Division, National Chemical Laboratory, Council of Scientific and Industrial Research (CSIR), Pune-411008, India.
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27
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Lai JY, Luo LJ. Antioxidant Gallic Acid-Functionalized Biodegradable in Situ Gelling Copolymers for Cytoprotective Antiglaucoma Drug Delivery Systems. Biomacromolecules 2015; 16:2950-63. [PMID: 26248008 DOI: 10.1021/acs.biomac.5b00854] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
In clinical ophthalmology, oxidative stress has been proposed as the initiating cause of ocular hypertension, which is one of the risk factors for glaucomatous damage and disease progression. In an attempt to improve the therapeutic efficacy of intracamerally administered pilocarpine, herein, a cytoprotective antiglaucoma drug delivery system composed of antioxidant gallic acid (GA)-functionalized gelatin-g-poly(N-isopropylacrylamide) (GN) biodegradable in situ gelling copolymer was developed for the first time. Analyses by UV-vis and Fourier transform infrared spectroscopies showed the formation of biopolymer-antioxidant covalent linkages in GNGA structures through a radical reaction in the presence of water-soluble redox initiators. The synthesized GNGA polymers with strong free radical scavenging effectiveness exhibited appropriate phase transition temperature and degradation rate as injectable bioerodible depots for minimally invasive pilocarpine delivery to the ocular anterior chamber. During the 2-week in vitro study, the sustained releases of sufficient amounts of pilocarpine for a therapeutic action in alleviating ocular hypertension could be achieved under physiological conditions. Results of cell viability, intracellular reactive oxygen species level, and intracellular calcium concentration indicated that the incorporation of antioxidant GA into GN structure can enhance cytoprotective effects of carrier materials against hydrogen peroxide-induced oxidative stress in lens epithelial cultures. Effective pharmacological responses (i.e., reduction of intraocular pressure and preservation of corneal endothelial cell morphology and density) in rabbits receiving intracameral GNGA injections containing pilocarpine were evidenced by clinical observations. The findings of in vivo studies also support the hypothesis that the GNGA carriers are more advantageous over their GN counterparts for the improvement of total antioxidant status in glaucomatous eyes with chronic ocular hypertension. The synthesized multifunctional molecules may be further used as potential polymer therapeutics for intraocular delivery of bioactive agents.
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Affiliation(s)
- Jui-Yang Lai
- Center for Tissue Engineering, Chang Gung Memorial Hospital , Taoyuan, Taiwan 33305, Republic of China
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28
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Ocepek M, Soucek MD, Berce P, Meng L. Comparison of Particle Size Techniques to Investigate Secondary Nucleation in HEMA-Rich Latexes. MACROMOL CHEM PHYS 2015. [DOI: 10.1002/macp.201400476] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Martin Ocepek
- Helios Domzˇale d.d.; Central R&D of HELIOS Group, Kolicˇevo 2; SI-1230 Domzˇale Slovenia
- Centre of Excellence for Polymer Materials and Technologies; Tehnolosˇki park 24 SI-1000 Ljubljana Slovenia
| | - Mark D. Soucek
- Department of Polymer Engineering; The University of Akron; 250 S. Forge St. Akron OH 44325 USA
| | - Peter Berce
- Helios Domzˇale d.d.; Central R&D of HELIOS Group, Kolicˇevo 2; SI-1230 Domzˇale Slovenia
| | - Lei Meng
- Department of Polymer Engineering; The University of Akron; 250 S. Forge St. Akron OH 44325 USA
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29
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Başbağ AB, Gümüşderelioğlu M, Şimşek M, Güner A. Poly(HEMA)/cyclodextrin-based hydrogels for subconjunctival delivery of cyclosporin A. J Appl Polym Sci 2014. [DOI: 10.1002/app.40397] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- A. Berna Başbağ
- Department of Chemical Engineering; Hacettepe University; Beytepe Ankara 06800 Turkey
| | - Menemşe Gümüşderelioğlu
- Department of Chemical Engineering; Hacettepe University; Beytepe Ankara 06800 Turkey
- Department of Nanotechnology and Nanomedicine; Hacettepe University; Beytepe Ankara 06800 Turkey
| | - Murat Şimşek
- Department of Nanotechnology and Nanomedicine; Hacettepe University; Beytepe Ankara 06800 Turkey
| | - Ali Güner
- Department of Chemistry; Hacettepe University; Beytepe Ankara 06800 Turkey
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30
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Kumar SSD, Mahesh A, Mahadevan S, Mandal AB. Synthesis and characterization of curcumin loaded polymer/lipid based nanoparticles and evaluation of their antitumor effects on MCF-7 cells. Biochim Biophys Acta Gen Subj 2014; 1840:1913-22. [PMID: 24440669 DOI: 10.1016/j.bbagen.2014.01.016] [Citation(s) in RCA: 66] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2013] [Revised: 01/07/2014] [Accepted: 01/10/2014] [Indexed: 11/30/2022]
Abstract
BACKGROUND Hybrid materials are synthesized using hydrophilic polymer and lipids which ensure their long term systemic circulation through intravenous administration and enhance loading of hydrophobic drugs. The purpose of this study is to prepare, characterize and evaluate the in vitro efficacy of curcumin loaded poly-hydroxyethyl methacrylate/stearic acid nanoparticles in MCF-7. METHODS C-PSA-NPs, prepared using the emulsification-solvent evaporation method were characterized by dynamic laser scattering, SEM, AFM, FT-IR, X-ray diffraction, and TGA. The in vitro release behavior was observed in PBS pH7.4, the anticancer potential was analyzed by MTT assay, cell cycle and apoptosis studies were performed through flow cytometry. C-PSA-NPs drug localization and cancer cell morphological changes were analyzed in MCF-7 cell line. RESULTS C-PSA-NPs exhibited the mean particle size in the range of 184nm with no aggregation. The surface charge of the material was around -29.3mV. Thermal studies (TGA) and surface chemistry studies (FT-IR, XRD) showed the existence of drug curcumin in C-PSA-NPs. The MTT assay indicated higher anticancer properties and flow cytometry studies revealed that there were better apoptotic activity and maximum localization of C-PSA-NPs than curcumin. CONCLUSIONS Polymer lipid based drug delivery appeared as one of the advancements in drug delivery systems. Through the present study, a novel polymer lipid based nanocarrier delivery system loaded with curcumin was demonstrated as an effective and potential alternative method for tumor treatment in MCF-7 cell line. GENERAL SIGNIFICANCE C-PSA-NPs exhibited potent anticancer activity in MCF-7 cell line and it indicates that C-PSA-NPs are a suitable carrier for curcumin.
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Affiliation(s)
- Sathish Sundar Dhilip Kumar
- Thermochemical Lab, Chemical Engineering Department, Central Leather Research Institute, Chennai 600 020, India
| | - Ayyavu Mahesh
- School of Biological Sciences, Madurai Kamaraj University, Madurai 625 021, India
| | - Surianarayanan Mahadevan
- Thermochemical Lab, Chemical Engineering Department, Central Leather Research Institute, Chennai 600 020, India.
| | - Asit Baran Mandal
- Thermochemical Lab, Chemical Engineering Department, Central Leather Research Institute, Chennai 600 020, India
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31
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Lai JY. Biodegradable in situ gelling delivery systems containing pilocarpine as new antiglaucoma formulations: effect of a mercaptoacetic acid/N-isopropylacrylamide molar ratio. DRUG DESIGN DEVELOPMENT AND THERAPY 2013; 7:1273-85. [PMID: 24187486 PMCID: PMC3810330 DOI: 10.2147/dddt.s53759] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Ocular drug delivery is one of the most commonly used treatment modalities in the management of glaucoma. We have recently proposed the use of gelatin and poly(N-isopropylacrylamide) (PNIPAAm) graft copolymers as biodegradable in situ forming delivery systems for the intracameral administration of antiglaucoma medications. In this study, we further investigated the influence of carrier characteristics on drug delivery performance. The carboxyl-terminated PNIPAAm samples with different molecular weights were synthesized by varying the molar ratio of mercaptoacetic acid (MAA)/N-isopropylacrylamide (NIPAAm) from 0.05 to 1.25, and were determined by end-group titration. The preparation of gelatin-g-PNIPAAm (GN) copolymers from these thermoresponsive polymers was achieved using carbodiimide chemistry. Our results showed that the carboxylic end-capped PNIPAAm of high molecular weight may lead to the lower thermal phase transition temperature and slower degradation rate of GN vehicles than its low molecular weight counterparts. With a decreasing MAA/NIPAAm molar ratio, the drug encapsulation efficiency of copolymers was increased due to fast temperature-triggered capture of pilocarpine nitrate. The degradation of the gelatin network could greatly affect the drug release profiles. All of the GN copolymeric carriers demonstrated good corneal endothelial cell and tissue compatibility. It is concluded that different types of GN-based delivery systems exhibit noticeably distinct intraocular pressure-lowering effect and miosis action, thereby reflecting the potential value of a MAA/NIPAAm molar ratio in the development of new antiglaucoma formulations.
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Affiliation(s)
- Jui-Yang Lai
- Institute of Biochemical and Biomedical Engineering, Biomedical Engineering Research Center, Molecular Medicine Research Center, Chang Gung University, Taoyuan, Taiwan
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Kumar SSD, Surianarayanan M, Vijayaraghavan R, Mandal AB, MacFarlane DR. Curcumin loaded poly(2-hydroxyethyl methacrylate) nanoparticles from gelled ionic liquid--in vitro cytotoxicity and anti-cancer activity in SKOV-3 cells. Eur J Pharm Sci 2013; 51:34-44. [PMID: 24012589 DOI: 10.1016/j.ejps.2013.08.036] [Citation(s) in RCA: 74] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2013] [Revised: 08/27/2013] [Accepted: 08/27/2013] [Indexed: 12/30/2022]
Abstract
The main focus of this study is to encapsulate hydrophobic drug curcumin in hydrophilic polymeric core such as poly(2-hydroxyethyl methacrylate) [PHEMA] nanoparticles from gelled ionic liquid (IL) to improve its efficacy. We have achieved 26.4% drug loading in a biocompatible hydrophilic polymer. Curcumin loaded PHEMA nanoparticles (C-PHEMA-NPs) were prepared by nano-precipitation method. Scanning electron microscopy (SEM) and atomic force microscopy (AFM) analysis showed that the prepared nanoparticles were spherical in shape and free from aggregation. The size and zeta potential of prepared C-PHEMA-NPs were about 300 nm and -33.4 mV respectively. C-PHEMA-NPs were further characterized by FT-IR spectroscopy which confirmed the existence of curcumin in the nanoparticles. X-ray diffraction and differential scanning calorimetry studies revealed that curcumin present in the PHEMA nanoparticles were found to be amorphous in nature. The anticancer activity of C-PHEMA-NPs was measured in ovarian cancer cells (SKOV-3) in vitro, and the results revealed that the C-PHEMA-NPs had better tumor cells regression activity than free curcumin. Flow cytometry showed the significant reduction in G0/G1 cells after treatment with C-PHEMA-NPs and molecular level of apoptosis were also studied using western blotting. Toxicity of PHEMA nanoparticles were studied in zebrafish embryo model and results revealed the material to be highly biocompatible. The present study demonstrates the curcumin loaded PHEMA nanoparticles have potential therapeutic values in the treatment of cancer.
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Affiliation(s)
- Sathish Sundar Dhilip Kumar
- Thermo Chemical Lab, Chemical Engineering Department, Central Leather Research Institute, Chennai 600 020, India
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Abstract
OBJECTIVE To investigate the use of contact lenses to release N-acetylcysteine (NAC) and N-acetylcysteine amide (NACA) that have frequently used for the treatment of some eye diseases. METHODS Three commercial contact lenses were used: Soflens Multi-Focal, 1-Day ACUVUE TruEye, and Frequency 55. All contact lenses were individually kept for 3 days in 10 mL of 3 mM NAC or NACA solutions in phosphate-buffered saline (PBS). After the loading period, the lenses were removed from the solution and put into 5 mL of PBS for 3 days (static mode). During this period, samples were taken at specified times and analyzed by high-pressure liquid chromatography. RESULTS From the release profiles of NAC and NACA, it was found that both NAC and NACA could be released from the lenses within 72 hours. Frequency 55 released 95.9%±2.7% of loaded NAC and 60.0%±2.1% of loaded NACA in 24 hours, whereas 1-Day ACUVUE TruEye released 80.9%±1.2% of loaded NAC and 54.0%±1.9% of loaded NACA and Soflens Multi-Focal released 72.8%±2.8% of loaded NAC and 51.9%±2.3% of loaded NACA during that same period. CONCLUSIONS The lenses could achieve the appropriate delivery of drugs during their intended time of wear. The amount of released NACA was less than that of NAC because of the more hydrophobic structure of NACA. According to the power law, the values of the exponential constant n were found to be below 0.5, indicating that the behavior observed was "less Fickian".
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The preparation and the in-vitro pharmacodynamics study of the intracapsular sustained-release preparations for the prevention of posterior capsule opacification. Asian J Pharm Sci 2013. [DOI: 10.1016/j.ajps.2013.08.001] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Tyagi P, Barros M, Stansbury JW, Kompella UB. Light-activated, in situ forming gel for sustained suprachoroidal delivery of bevacizumab. Mol Pharm 2013; 10:2858-67. [PMID: 23734705 DOI: 10.1021/mp300716t] [Citation(s) in RCA: 73] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
A light-activated polycaprolactone dimethacrylate (PCM) and hydroxyethyl methacrylate (HEMA) based gel network was developed to sustain the release of stable, active bevacizumab (an anti-VEGF antibody used to treat choroidal neovascularization) and used to assess sustained ex vivo delivery in rabbit eyes and in vivo delivery in rat eyes following in situ gel formation in the suprachoroidal space. PCM was synthesized from polycaprolactone diol (PCD) and evaluated using NMR spectroscopy. PCM was used to cross-link HEMA in the presence of 365 nm UV light and 2,2-dimethoxy-2-phenylacetophenone (DMPA) as a photoinitiator. Bevacizumab was entrapped in the gel using three different cross-linking durations of 3, 7, and 10 min. In vitro release of bevacizumab in PBS pH 7.4 at 37 °C during a 4 month study was quantified using a VEGF-binding based ELISA. The stability of released bevacizumab was monitored by size exclusion chromatography (SEC) and circular dichroism. Alexa Fluor 488 dye conjugated bevacizumab mixed with polymers was injected suprachoroidally in rabbit eyes to study the effect of different cross-linking durations on the spread of the dye conjugated bevacizumab. In vivo delivery was assessed in Sprague-Dawley (SD) rats by injecting Alexa Fluor 488 dye conjugated bevacizumab mixed with polymers followed by cross-linking for 10 min. Spread in the rabbit eyes and in vivo delivery in rat eyes was monitored noninvasively using a fundus camera and Fluorotron Master. The formation of PCM was confirmed by the disappearance of hydroxyl peak in NMR spectra. A cross-linking duration of 10 min resulted in a burst release of 21% of bevacizumab. Other cross-linking durations had ≥62% burst release. Bevacizumab release from 10 min cross-linked gel was sustained for ∼4 months. Release samples contained ≥96.1% of bevacizumab in the monomeric form as observed in SEC chromatograms. Circular dichroism confirmed that secondary β-sheet structure of bevacizumab was maintained after release from the gel. As the cross-linking duration was increased to 10 min, the gel/antibody was better confined at the injection site in excised rabbit eye suprachoroidal space. Delivery of Alexa Fluor 488 dye conjugated bevacizumab was sustained for at least 60 days in the suprachoroidal space of SD rats. PCM and HEMA gel sustained bevacizumab release for 4 months and maintained the stability and VEGF-binding activity of bevacizumab. Therefore, light-activated PCM and HEMA gel is suitable for in situ gel formation and sustained protein delivery in the suprachoroidal space.
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Affiliation(s)
- Puneet Tyagi
- Nanomedicine and Drug Delivery Laboratory, Department of Pharmaceutical Sciences, University of Colorado Anschutz Medical Campus, Aurora, Colorado 80045, United States
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Pulat M, Akalın GO, Karahan ND. Lipase release through semi-interpenetrating polymer network hydrogels based on chitosan, acrylamide, and citraconic acid. ARTIFICIAL CELLS NANOMEDICINE AND BIOTECHNOLOGY 2013; 42:121-7. [DOI: 10.3109/21691401.2013.794356] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Elakkiya T, Malarvizhi G, Rajiv S, Natarajan TS. Curcumin loaded electrospun Bombyx mori
silk nanofibers for drug delivery. POLYM INT 2013. [DOI: 10.1002/pi.4499] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Affiliation(s)
| | | | - Sheeja Rajiv
- Department of Chemistry; Anna University; Chennai Tamilnadu 600 025 India
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Pulat M, Akalin GO. Preparation and characterization of gelatin hydrogel support for immobilization ofCandida Rugosalipase. ARTIFICIAL CELLS NANOMEDICINE AND BIOTECHNOLOGY 2012; 41:145-51. [DOI: 10.3109/10731199.2012.696070] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Pahuja P, Arora S, Pawar P. Ocular drug delivery system: a reference to natural polymers. Expert Opin Drug Deliv 2012; 9:837-61. [DOI: 10.1517/17425247.2012.690733] [Citation(s) in RCA: 80] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
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Casolaro M, Casolaro I, Lamponi S. Stimuli-responsive hydrogels for controlled pilocarpine ocular delivery. Eur J Pharm Biopharm 2012; 80:553-61. [DOI: 10.1016/j.ejpb.2011.11.013] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2011] [Revised: 11/16/2011] [Accepted: 11/18/2011] [Indexed: 11/27/2022]
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Effect of monomeric sequence on transport properties of d-glucose and ascorbic acid in poly(VP-co-HEMA) hydrogels with various water contents: molecular dynamics simulation approach. Theor Chem Acc 2012. [DOI: 10.1007/s00214-012-1206-y] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Zhang Y, Chu D, Zheng M, Kissel T, Agarwal S. Biocompatible and degradable poly(2-hydroxyethyl methacrylate) based polymers for biomedical applications. Polym Chem 2012. [DOI: 10.1039/c2py20403g] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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A gelatin-g-poly(N-isopropylacrylamide) biodegradable in situ gelling delivery system for the intracameral administration of pilocarpine. Biomaterials 2011; 33:2372-87. [PMID: 22182746 DOI: 10.1016/j.biomaterials.2011.11.085] [Citation(s) in RCA: 91] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2011] [Accepted: 11/28/2011] [Indexed: 12/22/2022]
Abstract
In this study, the aminated gelatin was grafted with carboxylic end-capped poly(N-isopropylacrylamide) (PN) via a carbodiimide-mediated coupling reaction to fabricate biodegradable in situ forming delivery systems for intracameral administration of antiglaucoma medications. The chemical structure of the graft copolymers (GN) was confirmed by Fourier transform infrared (FTIR) spectroscopy. When the feed molar ratio of NH(2)/COOH was 0.36, the grafting ratio, efficiency and degree of grafting, and weight ratio of PN to aminated gelatin was 25.6, 18.6%, 52.6%, and 1.9, respectively. As compared to PN, the GN samples possessed better thermal gelation ability and adherence, indicating remarkable phase transition properties. Under gelatinase degradation, the remaining weight of GN was significantly lower than those of PN at each time point from 8 h to 4 weeks. Cytocompatibility studies showed that the culture of anterior segment cells with both in situ forming gels does not affect proliferation and has little effect on inflammation. Higher encapsulation efficiency (~62%) and cumulative release (~95%) were achieved for GN vehicles, which was attributed to initial fast temperature triggered capture of pilocarpine and subsequent progressive degradation of gelatin network. In a rabbit glaucoma model, the performance of delivery carriers was evaluated by biomicroscopy, intraocular pressure (IOP), and pupil size change. Intracameral administration of pilocarpine using GN was found to be more effective than other methods such as instillation of eye drop and injection of free drug or PN containing drug in improving ocular bioavailability and extending the pharmacological responses (i.e., miosis and IOP lowering effect and preservation of corneal endothelial cell density).
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Nair KL, Vidyanand S, James J, Kumar GSV. Pilocarpine-loaded poly(DL-lactic-co-glycolic acid) nanoparticles as potential candidates for controlled drug delivery with enhanced ocular pharmacological response. J Appl Polym Sci 2011. [DOI: 10.1002/app.35229] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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Paulo NM, Malmonge SM, Menezes LBD, Lima FGD, Faria ADM, Andrasckho MM, Moreira NM, Atayde IB, Silva MSDBE. Evaluation of peritoneal adhesions formation and tissue response to polypropylene - poli (2-hydroxyethyl methacrylate)-(polyHEMA) implant on rats' abdominal wall. Acta Cir Bras 2011; 25:337-41. [PMID: 20676491 DOI: 10.1590/s0102-86502010000400007] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2010] [Accepted: 04/19/2010] [Indexed: 11/22/2022] Open
Abstract
PURPOSE To verify if the composit poli (2-hydroxyethyl methacrylate)-PolyHEMA/polypropylene mesh implanted in the female rat's abdominal wall could be suitable for the prevention of peritoneal adhesions, and for the evaluation of the tecidual response produced by this biomaterial. METHODS Polypropylene meshes (Group PP, n=20) and polypropylene meshes coated with a layer of poli (2-hydroxyethyl methacrylate)-PolyHEMA (Group PH, n=20) were implanted on the abdominal wall of Wistar female rats. Ten animals from each group were submitted to euthanasia at 15 and 30 days of the postoperative period. RESULTS The animals from the group PP presented visceral adhesions on the mesh surface, which was not observed in the ones from group PH. At the histopathological examination foreign body response was observed in both groups, whilst there was a greater intensity of inflammatory response in group PH on both moments. CONCLUSION The poli (2-hydroxyethyl methacrylate) polyHEMA hydrogel associated to polypropylene mesh reduces visceral adhesion formation in rats, although it may be associated to greater inflammatory reaction.
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Affiliation(s)
- Neusa Margarida Paulo
- Veterinary Surgery, Department of Veterinary Medicin, Universidade Federal de Goiás, Goiânia, GO, Brazil.
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Bose RK, Lau KKS. Mechanical properties of ultrahigh molecular weight PHEMA hydrogels synthesized using initiated chemical vapor deposition. Biomacromolecules 2010; 11:2116-22. [PMID: 20690719 DOI: 10.1021/bm100498a] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
In this work, poly(2-hydroxyethyl methacrylate) (PHEMA), a widely used hydrogel, is synthesized using initiated chemical vapor deposition (iCVD), a one-step surface polymerization that does not use any solvents. iCVD synthesis is capable of producing linear stoichiometric polymers that are free from entrained unreacted monomer or solvent and, thus, do not require additional purification steps. The resulting films, therefore, are found to be noncytotoxic and also have low nonspecific protein adsorption. The kinetics of iCVD polymerization are tuned so as to achieve rapid deposition rates ( approximately 1.5 microm/min), which in turn yield ultrahigh molecular weight polymer films that are mechanically robust with good water transport and swellability. The films have an extremely high degree of physical chain entanglement giving rise to high tensile modulus and storage modulus without the need for chemical cross-linking that compromises hydrophilicity.
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Affiliation(s)
- Ranjita K Bose
- Department of Chemical and Biological Engineering, Drexel University, Philadelphia, Pennsylvania 19104, USA
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Casadio YS, Brown DH, Chirila TV, Kraatz HB, Baker MV. Biodegradation of poly(2-hydroxyethyl methacrylate) (PHEMA) and poly{(2-hydroxyethyl methacrylate)-co-[poly(ethylene glycol) methyl ether methacrylate]} hydrogels containing peptide-based cross-linking agents. Biomacromolecules 2010; 11:2949-59. [PMID: 20961104 DOI: 10.1021/bm100756c] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
PHEMA-peptide and P[HEMA-co-(MeO-PEGMA)]-peptide conjugate hydrogels [where PHEMA = poly(2-hydroxyethyl methacrylate; PEGMA = poly(ethylene glycol) methacrylate] were readily prepared via photoinitiated free-radical polymerization in water. The PHEMA-peptide hydrogels were opaque and had a heterogeneous morphology of interconnected polymer droplets, characteristic of polymers that separate from the aqueous phase during the polymerization experiment. The P[HEMA-co-(MeO-PEGMA)]-peptide conjugates were transparent gels with a homogeneous morphology when formed in water, but when formed in aqueous NaCl solutions the P[HEMA-co-(MeO-PEGMA)]-peptide conjugates were also opaque and exhibited the heterogeneous morphology of interconnected polymer droplets. When incubated in solutions containing activated papain, P[HEMA-co-(MeO-PEGMA)]-peptide conjugates underwent degradation that was characterized by macroscopic changes to sample shape and size, sample weight, and microscopic structure. PHEMA-peptide conjugates did not undergo any significant degradation when incubated with papain, although ninhydrin-staining experiments suggested that some peptide cross-linker groups were cleaved during the incubation. The difference in degradation behavior of PHEMA-peptide and P[HEMA-co-(MeO-PEGMA)]-peptide conjugates is attributed to differences in aqueous solubility of PHEMA and P[HEMA-co-(MeO-PEGMA)].
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Affiliation(s)
- Ylenia S Casadio
- Chemistry M313, School of Biomedical, Biomolecular and Chemical Sciences, The University of Western Australia, Crawley, W.A. 6009, Australia, Nanochemistry Research Institute, Department of Chemistry, Curtin University of Technology, Kent St, Bentley, W.A. 6102, Australia, Queensland Eye Institute, 41 Annerley Road, South Brisbane, Queensland 4101, Australia, Faculty of Science and Technology, Queensland University of Technology, Brisbane, Queensland 4001, Australia, Australian Institute for Bioengineering and Nanotechnology, University of Queensland, St Lucia, Brisbane, Queensland 4072, Australia, Faculty of Health Sciences, University of Queensland, Herston, Queensland 4006, Australia, Department of Chemistry, The University of Western Ontario, Chemistry Building 1151 Richmond Street, London, Ontario, Canada N6A 5B7, and Department of Chemistry, College of Science and Engineering, National Dong Hwa University, Hualien 974, Taiwan, ROC
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Pulat M, Tan N, Onurdağ FK. Swelling dynamics of IPN hydrogels including acrylamide-acrylic acid-chitosan and evaluation of their potential for controlled release of piperacillin-tazobactam. J Appl Polym Sci 2010. [DOI: 10.1002/app.33169] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Jain D, Carvalho E, Banthia AK, Banerjee R. Development of polyvinyl alcohol-gelatin membranes for antibiotic delivery in the eye. Drug Dev Ind Pharm 2010; 37:167-77. [PMID: 21073319 DOI: 10.3109/03639045.2010.502533] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
AIM The aim of the present study was to develop biosynthetic hybrid polymer-based ocular insert for topical administration of antibiotics for treatment of ocular infections. METHODS Ciprofloxacin hydrochloride-loaded three different inserts were prepared by solution casting method by esterification of a biopolymer (gelatin) with a synthetic polymer (polyvinyl alcohol, PVA). Esterification between PVA and gelatin was confirmed by Fourier transform infrared spectroscopy. RESULTS Inserts were found to be wettable and swellable with simulated tear fluid and had a contact angle <50° with simulated tear fluid. Mechanical properties of PVA-gelatin (10:3 wt%) inserts included a maximal tensile strength of 8.6 ± 2 MPa and the inserts showed adequate mucoadhesion with reconstituted mucin. In vitro drug release of ciprofloxacin hydrochloride for up to 24 hours was observed from the inserts. Inserts were found to be biocompatible using SIRC rabbit corneal epithelial cell line by sulforhodamine B assay and by Draize test in albino rabbits. Further inserts showed higher ocular penetration of sodium fluorescein in goat eye as compared to eyedrop solution. CONCLUSIONS In brief, the study suggests that PVA-gelatin polymeric blends are promising as ocular inserts for prolonged release of antibiotic in the eye as compared to eyedrops. Such inserts may also be therapeutically beneficial for treatment of corneal ulcers and external ocular infections.
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Affiliation(s)
- Dharmendra Jain
- Department of Biosciences and Bioengineering, Indian Institute of Technology, Mumbai, India
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Silva MSDBE, Melo RMD, Menezes LBD, Malmonge SM, Franco LG, Paulo NM. 2-hydroxyethyl methacrylate composite - polypropylene mesh for preventing peritoneal adhesions in female dogs. Acta Cir Bras 2010; 25:342-6. [PMID: 20676492 DOI: 10.1590/s0102-86502010000400008] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2010] [Accepted: 04/19/2010] [Indexed: 11/22/2022] Open
Abstract
PURPOSE To evaluate whether the lining facing the visceral side of polypropylene mesh made with 2-hydroxyethyl methacrylate (p(HEMA)) hydrogel could avoid peritoneal adhesion in female dogs. METHODS Eight animals (group PP) had a polypropylene mesh implanted to correct a defect in the rectal abdominal muscle, whereas in the other group (group PH) the polypropylene mesh was coated with p(HEMA) composite on the surface facing the peritoneal area. RESULTS Adhesions were observed on the mesh in 62.5% of the PP group. In the PH group adhesions were present only on the suture lines. CONCLUSION p(HEMA) hydrogel was well tolerated and effective in avoiding visceral and omental adhesions on the surface of the polypropylene mesh.
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