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El-Husseiny HM, Mady EA, Hamabe L, Abugomaa A, Shimada K, Yoshida T, Tanaka T, Yokoi A, Elbadawy M, Tanaka R. Smart/stimuli-responsive hydrogels: Cutting-edge platforms for tissue engineering and other biomedical applications. Mater Today Bio 2022; 13:100186. [PMID: 34917924 PMCID: PMC8669385 DOI: 10.1016/j.mtbio.2021.100186] [Citation(s) in RCA: 75] [Impact Index Per Article: 37.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2021] [Revised: 11/14/2021] [Accepted: 12/08/2021] [Indexed: 02/07/2023] Open
Abstract
Recently, biomedicine and tissue regeneration have emerged as great advances that impacted the spectrum of healthcare. This left the door open for further improvement of their applications to revitalize the impaired tissues. Hence, restoring their functions. The implementation of therapeutic protocols that merge biomimetic scaffolds, bioactive molecules, and cells plays a pivotal role in this track. Smart/stimuli-responsive hydrogels are remarkable three-dimensional (3D) bioscaffolds intended for tissue engineering and other biomedical purposes. They can simulate the physicochemical, mechanical, and biological characters of the innate tissues. Also, they provide the aqueous conditions for cell growth, support 3D conformation, provide mechanical stability for the cells, and serve as potent delivery matrices for bioactive molecules. Many natural and artificial polymers were broadly utilized to design these intelligent platforms with novel advanced characteristics and tailored functionalities that fit such applications. In the present review, we highlighted the different types of smart/stimuli-responsive hydrogels with emphasis on their synthesis scheme. Besides, the mechanisms of their responsiveness to different stimuli were elaborated. Their potential for tissue engineering applications was discussed. Furthermore, their exploitation in other biomedical applications as targeted drug delivery, smart biosensors, actuators, 3D and 4D printing, and 3D cell culture were outlined. In addition, we threw light on smart self-healing hydrogels and their applications in biomedicine. Eventually, we presented their future perceptions in biomedical and tissue regeneration applications. Conclusively, current progress in the design of smart/stimuli-responsive hydrogels enhances their prospective to function as intelligent, and sophisticated systems in different biomedical applications.
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Affiliation(s)
- Hussein M. El-Husseiny
- Laboratory of Veterinary Surgery, Department of Veterinary Medicine, Faculty of Agriculture, Tokyo University of Agriculture and Technology, 3-5-8 Saiwai Cho, Fuchu-shi, Tokyo, 1838509, Japan
- Department of Surgery, Anesthesiology, and Radiology, Faculty of Veterinary Medicine, Benha University, Moshtohor, Toukh, Elqaliobiya, 13736, Egypt
| | - Eman A. Mady
- Department of Animal Hygiene, Behavior and Management, Faculty of Veterinary Medicine, Benha University, Moshtohor, Toukh, Elqaliobiya, 13736, Egypt
| | - Lina Hamabe
- Laboratory of Veterinary Surgery, Department of Veterinary Medicine, Faculty of Agriculture, Tokyo University of Agriculture and Technology, 3-5-8 Saiwai Cho, Fuchu-shi, Tokyo, 1838509, Japan
| | - Amira Abugomaa
- Faculty of Veterinary Medicine, Mansoura University, Mansoura, Dakahliya, 35516, Egypt
| | - Kazumi Shimada
- Laboratory of Veterinary Surgery, Department of Veterinary Medicine, Faculty of Agriculture, Tokyo University of Agriculture and Technology, 3-5-8 Saiwai Cho, Fuchu-shi, Tokyo, 1838509, Japan
- Division of Research Animal Laboratory and Translational Medicine, Research and Development Center, Osaka Medical College, 2-7 Daigaku-machi, Takatsuki City, Osaka, 569-8686, Japan
| | - Tomohiko Yoshida
- Laboratory of Veterinary Surgery, Department of Veterinary Medicine, Faculty of Agriculture, Tokyo University of Agriculture and Technology, 3-5-8 Saiwai Cho, Fuchu-shi, Tokyo, 1838509, Japan
| | - Takashi Tanaka
- Laboratory of Veterinary Surgery, Department of Veterinary Medicine, Faculty of Agriculture, Tokyo University of Agriculture and Technology, 3-5-8 Saiwai Cho, Fuchu-shi, Tokyo, 1838509, Japan
| | - Aimi Yokoi
- Laboratory of Veterinary Surgery, Department of Veterinary Medicine, Faculty of Agriculture, Tokyo University of Agriculture and Technology, 3-5-8 Saiwai Cho, Fuchu-shi, Tokyo, 1838509, Japan
| | - Mohamed Elbadawy
- Department of Pharmacology, Faculty of Veterinary Medicine, Benha University, Moshtohor, Toukh, Elqaliobiya, 13736, Egypt
| | - Ryou Tanaka
- Laboratory of Veterinary Surgery, Department of Veterinary Medicine, Faculty of Agriculture, Tokyo University of Agriculture and Technology, 3-5-8 Saiwai Cho, Fuchu-shi, Tokyo, 1838509, Japan
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2
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Ciancia S, Cafarelli A, Zahoranova A, Menciassi A, Ricotti L. Pulsatile Drug Delivery System Triggered by Acoustic Radiation Force. Front Bioeng Biotechnol 2020; 8:317. [PMID: 32411680 PMCID: PMC7202567 DOI: 10.3389/fbioe.2020.00317] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2019] [Accepted: 03/24/2020] [Indexed: 11/13/2022] Open
Abstract
Since biological systems exhibit a circadian rhythm (24-hour cycle), they are susceptible to the timing of drug administration. Indeed, several disorders require a therapy that synchronizes with the onset of symptoms. A targeted therapy with spatially and temporally precise controlled drug release can guarantee a considerable gain in terms of efficacy and safety of the treatment compared to traditional pharmacological methods, especially for chronotherapeutic disorders. This paper presents a proof of concept of an innovative pulsatile drug delivery system remotely triggered by the acoustic radiation force of ultrasound. The device consists of a case, in which a drug-loaded gel can be embedded, and a sliding top that can be moved on demand by the application of an acoustic stimulus, thus enabling drug release. Results demonstrate for the first time that ultrasound acoustic radiation force (up to 0.1 N) can be used for an efficient pulsatile drug delivery (up to 20 μg of drug released for each shot).
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Affiliation(s)
- Sabrina Ciancia
- The BioRobotics Institute, Sant'Anna School of Advanced Studies, Pisa, Italy.,Departments of Excellence, Robotics & AI, Sant'Anna School of Advanced Studies, Pisa, Italy
| | - Andrea Cafarelli
- The BioRobotics Institute, Sant'Anna School of Advanced Studies, Pisa, Italy.,Departments of Excellence, Robotics & AI, Sant'Anna School of Advanced Studies, Pisa, Italy
| | - Anna Zahoranova
- Department for Biomaterials Research, Polymer Institute SAS, Bratislava, Slovakia
| | - Arianna Menciassi
- The BioRobotics Institute, Sant'Anna School of Advanced Studies, Pisa, Italy.,Departments of Excellence, Robotics & AI, Sant'Anna School of Advanced Studies, Pisa, Italy
| | - Leonardo Ricotti
- The BioRobotics Institute, Sant'Anna School of Advanced Studies, Pisa, Italy.,Departments of Excellence, Robotics & AI, Sant'Anna School of Advanced Studies, Pisa, Italy
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3
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Li X, Ma W, Shestopalov AA. Vapor-Phase Carbenylation of Hard and Soft Material Interfaces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:11386-11394. [PMID: 27759398 DOI: 10.1021/acs.langmuir.6b02471] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
This study describes the formation of functional organic monolayers on hard and soft interfaces via a vapor-phase carbene insertion into Si-H and C-H bonds. We demonstrate that functional diazirine molecules can be used to form monomolecular coatings on silicon, silicon nitride, and urethane-acrylate polymers under mild vacuum conditions and exposure to UV light. We investigate the molecular coverage and the long-term stability of the resulting monolayers in air, isopropanol, and water. Our results suggest that vapor-phase carbenylation can be used as a complementary technology to the traditional self-assembly, permitting functionalization of various passivated substrates with stable and functional molecular coatings under mild and scalable conditions.
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Affiliation(s)
- Xunzhi Li
- Department of Chemical Engineering, University of Rochester , Rochester, New York 14627, United States
| | - Wenchuan Ma
- Department of Chemical Engineering, University of Rochester , Rochester, New York 14627, United States
| | - Alexander A Shestopalov
- Department of Chemical Engineering, University of Rochester , Rochester, New York 14627, United States
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Wang X, Xu J, Li L, Liu Y, Li Y, Dong Q. Influences of fluorine on microphase separation in fluorinated polyurethanes. POLYMER 2016. [DOI: 10.1016/j.polymer.2016.06.039] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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5
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Kara F, Aksoy EA, Calamak S, Hasirci N, Aksoy S. Immobilization of heparin on chitosan-grafted polyurethane films to enhance anti-adhesive and antibacterial properties. J BIOACT COMPAT POL 2015. [DOI: 10.1177/0883911515598794] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Infections caused by bacteria adhering to implant surfaces are one of the main reasons for the failure of the implants. In this study, polyurethane (PU), which is the most commonly used polymer in the production of medical devices, was synthesized and surfaces of polyurethane films were modified by chitosan (CH) grafting and heparin (Hep) immobilization in order to enhance anti-adhesiveness and antibacterial properties. Functional groups present on the surface, topographical shapes, and free energies of the polyurethane films were determined. Pristine polyurethane, chitosan-grafted polyurethane (PU–CH), and heparin immobilized polyurethane (PU–CH–Hep) films demonstrated high anti-adhesive efficacy against bacteria in the given order, where PU–CH–Hep was the most effective one. When PU–CH–Hep samples were incubated with different bacteria, complete death was observed for Pseudomonas aeruginosa (Gram negative), Staphylococcus aureus (Gram positive), and Staphylococcus epidermidis (Gram positive). Some living Escherichia coli (Gram negative) were observed after 24 h of incubation. Pristine and modified polyurethane samples demonstrated no adverse effect on proliferation of L929 fibroblast cells and were found to be biocompatible according to MTT cytotoxicity tests.
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Affiliation(s)
- Filiz Kara
- Department of Chemistry, Faculty of Science, Gazi University, Ankara, Turkey
| | - Eda Ayse Aksoy
- Department of Basic Pharmaceutical Sciences, Faculty of Pharmacy, Hacettepe University, Ankara, Turkey
| | - Semih Calamak
- Department of Basic Pharmaceutical Sciences, Faculty of Pharmacy, Hacettepe University, Ankara, Turkey
| | - Nesrin Hasirci
- Graduate Department of Biotechnology, Middle East Technical University, Ankara, Turkey
- Department of Chemistry, Faculty of Arts and Sciences, Middle East Technical University, Ankara, Turkey
- BIOMATEN, Center of Excellence in Biomaterials and Tissue Engineering, Middle East Technical University, Ankara, Turkey
| | - Serpil Aksoy
- Department of Chemistry, Faculty of Science, Gazi University, Ankara, Turkey
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Dawlee S, Jayabalan M. Intrinsically radiopaque polyurethanes with chain extender 4,4'-isopropylidenebis [2-(2,6-diiodophenoxy)ethanol] for biomedical applications. J Biomater Appl 2014; 29:1329-42. [PMID: 25542732 DOI: 10.1177/0885328214565221] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Radiopaque polyurethanes are used for medical applications as it allows post-operative assessment of the biomaterial devices using X-ray. Inherently, radiopaque polyurethanes based on polytetramethylene glycol (PTMG), polypropylene glycol, 4,4'-methylenebis(phenyl isocyanate), and a new iodinated chain extender 4,4'-isopropylidenebis[2-(2,6-diiodophenoxy)ethanol] with flexible spacers were synthesized and characterized. The iodinated polyurethanes were clear, optically transparent, and had high molecular weights. The polyurethanes also possessed excellent radiopacity and high thermal stability. The biocompatibility of the most promising iodinated polyurethane was evaluated both in vitro (cytotoxicity evaluation by direct contact and MTT assay, using L929 mouse fibroblast cells) and in vivo (toxicology studies in rabbits and subcutaneous implantation in rats). The material was nontoxic and well tolerated by the animals. Thus, these radiopaque and transparent polyurethanes are expected to have potential for various biomedical applications.
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Affiliation(s)
- S Dawlee
- Polymer Science Division, Biomedical Technology Wing, Sree Chitra Tirunal Institute for Medical Sciences and Technology, Kerala, India
| | - M Jayabalan
- Polymer Science Division, Biomedical Technology Wing, Sree Chitra Tirunal Institute for Medical Sciences and Technology, Kerala, India
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Noble ML, Mourad PD, Ratner BD. Digital Drug Delivery: On-Off Ultrasound Controlled Antibiotic Release from Coated Matrices with Negligible Background Leaching. Biomater Sci 2014; 2:839-902. [PMID: 25045519 DOI: 10.1039/c3bm60203f] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Hydrogels, such as crosslinked poly(2-hydroxyethyl methacrylate) (pHEMA) have been used extensively in controlled release drug delivery systems. Our previous work demonstrated an ultrasound (US)-responsive system based on pHEMA coated with a self-assembled multilayer of C12-C18 methylene chains. The resulting coating was predominantly crystalline and relatively impermeable, forming an US-activated switch that controlled drug release on-demand, and kept the drug within the matrix in the absence of US. The device, as developed did, however, show a low background drug-leaching rate independent of US irradiation. For some applications, it is desirable to have very low or zero background release rates. This was achieved here by a combination of new processing steps, and by copolymerizing HEMA with a relatively hydrophobic monomer, hydroxypropyl methacrylate (HPMA). These advances produced systems with undetectable ciprofloxacin background release rates that are capable of US-facilitated drug release - up to 14-fold increases relative to controls both before and after US exposure. In addition, these observations are consistent with the hypothesis that US-mediated disorganization of the coating allows a transient flux of water into the matrix where its interaction with bound and dissolved drug facilitates its movement both within and out of the matrix.
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Affiliation(s)
- Misty L Noble
- Dept. of Bioengineering, University of Washington, Seattle, WA, USA 98195
| | - Pierre D Mourad
- Applied Physics Laboratory and Dept. of Neurosurgery, University of Washington, Seattle, WA 98195
| | - Buddy D Ratner
- Dept. of Bioengineering, University of Washington, Seattle, WA, USA 98195
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8
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The effect of octadecyl chain immobilization on the hemocompatibility of poly (2-hydroxyethyl methacrylate). Biomaterials 2012; 33:7677-85. [DOI: 10.1016/j.biomaterials.2012.07.007] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2012] [Accepted: 07/02/2012] [Indexed: 11/22/2022]
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Traitel T, Goldbart R, Kost J. Smart polymers for responsive drug-delivery systems. JOURNAL OF BIOMATERIALS SCIENCE-POLYMER EDITION 2012; 19:755-67. [DOI: 10.1163/156856208784522065] [Citation(s) in RCA: 81] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Affiliation(s)
- Tamar Traitel
- a Department of Chemical Engineering, Ben-Gurion University of the Negev, P.O. Box 653, Beer Sheva 84105, Israel
| | - Riki Goldbart
- b Department of Chemical Engineering, Ben-Gurion University of the Negev, P.O. Box 653, Beer Sheva 84105, Israel
| | - Joseph Kost
- c Department of Chemical Engineering, Ben-Gurion University of the Negev, P.O. Box 653, Beer Sheva 84105, Israel
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10
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Gribova V, Auzely-Velty R, Picart C. Polyelectrolyte Multilayer Assemblies on Materials Surfaces: From Cell Adhesion to Tissue Engineering. CHEMISTRY OF MATERIALS : A PUBLICATION OF THE AMERICAN CHEMICAL SOCIETY 2012; 24:854-869. [PMID: 25076811 PMCID: PMC4112380 DOI: 10.1021/cm2032459] [Citation(s) in RCA: 231] [Impact Index Per Article: 19.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
Controlling the bulk and surface properties of materials is a real challenge for bioengineers working in the fields of biomaterials, tissue engineering and biophysics. The layer-by-layer (LbL) deposition method, introduced 20 years ago, consists in the alternate adsorption of polyelectrolytes that self-organize on the material's surface, leading to the formation of polyelectrolyte multilayer (PEM) films.1 Because of its simplicity and versatility, the procedure has led to considerable developments of biological applications within the past 5 years. In this review, we focus our attention on the design of PEM films as surface coatings for applications in the field of physical properties that have emerged as being key points in relation to biological processes. The numerous possibilities for adjusting the chemical, physical, and mechanical properties of PEM films have fostered studies on the influence of these parameters on cellular behaviors. Importantly, PEM have emerged as a powerful tool for the immobilization of biomolecules with preserved bioactivity.
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Affiliation(s)
- Varvara Gribova
- LMGP-MINATEC, Grenoble Institute of Technology, 3 Parvis Louis Néel, 38016 Grenoble, France
- Centre de Recherches sur les Macromolécules Végétales (CERMAV-CNRS), affiliated with University Joseph Fourier, and member of the Institut de Chimie Moléculaire de Grenoble, France
| | - Rachel Auzely-Velty
- Centre de Recherches sur les Macromolécules Végétales (CERMAV-CNRS), affiliated with University Joseph Fourier, and member of the Institut de Chimie Moléculaire de Grenoble, France
| | - Catherine Picart
- LMGP-MINATEC, Grenoble Institute of Technology, 3 Parvis Louis Néel, 38016 Grenoble, France
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11
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Xu J, Ma Y, Xie J, Xu F, Yang W. Functionalization of polymeric surfaces by simple photoactivation of CH bonds. ACTA ACUST UNITED AC 2011. [DOI: 10.1002/pola.24707] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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12
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Gandhi BR, Mundada AS, Gandhi PP. Chronopharmaceutics: As a clinically relevant drug delivery system. Drug Deliv 2010; 18:1-18. [DOI: 10.3109/10717544.2010.509358] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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13
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Protein adsorption and clotting time of pHEMA hydrogels modified with C18 ligands to adsorb albumin selectively and reversibly. Biomaterials 2009; 30:5541-51. [DOI: 10.1016/j.biomaterials.2009.06.025] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2009] [Accepted: 06/10/2009] [Indexed: 11/18/2022]
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14
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Anderson EM, Noble ML, Garty S, Ma H, Bryers JD, Shen TT, Ratner BD. Sustained release of antibiotic from poly(2-hydroxyethyl methacrylate) to prevent blinding infections after cataract surgery. Biomaterials 2009; 30:5675-81. [PMID: 19631376 DOI: 10.1016/j.biomaterials.2009.06.047] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2009] [Accepted: 06/21/2009] [Indexed: 11/17/2022]
Abstract
Intraocular lens implantation after opacified natural lens removal is the primary treatment for cataracts in developed countries. Cataract surgery is generally considered safe, but entails significant risks in countries where sophisticated sterile operating theaters are not widely available. Post-operative infection (endophthalmitis) is a potential blinding complication. Infection often results from bacterial colonization of the new lens implant and subsequent antibiotic-tolerant biofilm formation. To combat this risk, we developed a polymeric hydrogel system that can deliver effective levels of antibiotic over an extended period of time within the globe of the eye. Norfloxacin antibiotic was loaded into cross-linked poly(2-hydroxyethyl methacrylate) (pHEMA) gels, which were subsequently surface-modified with octadecyl isocyanate to produce a hydrophobic rate-limiting barrier controlling norfloxacin release. Octadecyl surface modification was characterized using scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). A 15-min modification leads to a uniform surface coating and near zero order release of norfloxacin from the matrix. Norfloxacin released from coated pHEMA kills Staphylococcus epidermidis in suspension and on a simulated medical implant surface. With these data, we demonstrate a new and effective system for sustained drug release from a hydrogel matrix with specific application for intraocular lens surgery.
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Affiliation(s)
- Erin M Anderson
- Dept. of Bioengineering, University of Washington, Seattle, WA 98195, USA
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15
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Hozumi A, Kim B, McCarthy TJ. Vapor-phase formation of alkyl isocyanate-derived self-assembled monolayers on titanium dioxide. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2009; 25:2875-80. [PMID: 19437701 DOI: 10.1021/la803564c] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
Titanium dioxide (TiO2) surfaces were modified at atmospheric pressure by exposure to the vapor of alkyl isocyanates having different alkyl chain lengths (CH3[CH2]nN=C=O, where n = 3, 4, 7, 11, 15, and 17). Dynamic water contact angle measurements, X-ray photoelectron spectroscopy, and atomic force microscopy confirmed that the vapor-phase treatment produced self-assembled monolayers (SAMs) of the isocyanate molecules on the TiO2 surface through a carbamate linkage without any marked changes in surface morphology. The thickness and hydrophobicity of the isocyanate-derived SAMs depend on both the alkyl chain length and process temperature. As a control, an oxidized silicon (SiO2/Si) surface was treated under the same conditions. Water contact angle hysteresis for the SAM-covered TiO2 surfaces is greater than that observed for SAM-covered SiO2/Si surfaces, suggesting that SAMs on TiO2 surfaces are disordered and/or insufficiently cover the surfaces. This leads to their water sensitivity. Desorption kinetics are also strongly affected by the alkyl chain length, and the SAMs of adsorbed molecules with n = 15 and 17 are relatively stable among these six isocyanate-derived SAMs.
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Affiliation(s)
- Atsushi Hozumi
- National Institute of Advanced Industrial Science & Technology (AIST), Shimoshidami, Moriyama-ku, Nagoya 463-8560, Japan.
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Saavedra HM, Thompson CM, Hohman JN, Crespi VH, Weiss PS. Reversible Lability by in Situ Reaction of Self-Assembled Monolayers. J Am Chem Soc 2009; 131:2252-9. [DOI: 10.1021/ja807648g] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- Héctor M. Saavedra
- Departments of Chemistry and Physics, The Pennsylvania State University, 104 Davey Laboratory, University Park, Pennsylvania 16802
| | - Christopher M. Thompson
- Departments of Chemistry and Physics, The Pennsylvania State University, 104 Davey Laboratory, University Park, Pennsylvania 16802
| | - J. Nathan Hohman
- Departments of Chemistry and Physics, The Pennsylvania State University, 104 Davey Laboratory, University Park, Pennsylvania 16802
| | - Vincent H. Crespi
- Departments of Chemistry and Physics, The Pennsylvania State University, 104 Davey Laboratory, University Park, Pennsylvania 16802
| | - Paul S. Weiss
- Departments of Chemistry and Physics, The Pennsylvania State University, 104 Davey Laboratory, University Park, Pennsylvania 16802
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17
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Brazel CS. Magnetothermally-responsive Nanomaterials: Combining Magnetic Nanostructures and Thermally-Sensitive Polymers for Triggered Drug Release. Pharm Res 2008; 26:644-56. [DOI: 10.1007/s11095-008-9773-2] [Citation(s) in RCA: 162] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2008] [Accepted: 10/28/2008] [Indexed: 10/21/2022]
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19
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Bryers JD, Ratner BD. Biomaterials approaches to combating oral biofilms and dental disease. BMC Oral Health 2006; 6 Suppl 1:S15. [PMID: 16934116 PMCID: PMC2147597 DOI: 10.1186/1472-6831-6-s1-s15] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
Abstract
Background Possibilities for biomaterials to impact the dental caries epidemic are reviewed with emphasis placed on novel delivery biomaterials and new therapeutic targets.
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Affiliation(s)
- James D Bryers
- Department of Bioengineering, Biomaterials (UWEB) Center, University of Washington, Seattle, WA 98195, USA
- University of Washington Engineered Biomaterials (UWEB) Center, University of Washington, Seattle, WA 98195, USA
| | - Buddy D Ratner
- Department of Bioengineering, Biomaterials (UWEB) Center, University of Washington, Seattle, WA 98195, USA
- University of Washington Engineered Biomaterials (UWEB) Center, University of Washington, Seattle, WA 98195, USA
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20
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Norris P, Noble M, Francolini I, Vinogradov AM, Stewart PS, Ratner BD, Costerton JW, Stoodley P. Ultrasonically controlled release of ciprofloxacin from self-assembled coatings on poly(2-hydroxyethyl methacrylate) hydrogels for Pseudomonas aeruginosa biofilm prevention. Antimicrob Agents Chemother 2006; 49:4272-9. [PMID: 16189108 PMCID: PMC1251529 DOI: 10.1128/aac.49.10.4272-4279.2005] [Citation(s) in RCA: 63] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Indwelling prostheses and subcutaneous delivery devices are now routinely and indispensably employed in medical practice. However, these same devices often provide a highly suitable surface for bacterial adhesion and colonization, resulting in the formation of complex, differentiated, and structured communities known as biofilms. The University of Washington Engineered Biomaterials group has developed a novel drug delivery polymer matrix consisting of a poly(2-hydroxyethyl methacrylate) hydrogel coated with ordered methylene chains that form an ultrasound-responsive coating. This system was able to retain the drug ciprofloxacin inside the polymer in the absence of ultrasound but showed significant drug release when low-intensity ultrasound was applied. To assess the potential of this controlled drug delivery system for the targeting of infectious biofilms, we monitored the accumulation of Pseudomonas aeruginosa biofilms grown on hydrogels with and without ciprofloxacin and with and without exposure to ultrasound (a 43-kHz ultrasonic bath for 20 min daily) in an in vitro flow cell study. Biofilm accumulation from confocal images was quantified and statistically compared by using COMSTAT biofilm analysis software. Biofilm accumulation on ciprofloxacin-loaded hydrogels with ultrasound-induced drug delivery was significantly reduced compared to the accumulation of biofilms grown in control experiments. The results of these studies may ultimately facilitate the future development of medical devices sensitive to external ultrasonic impulses and capable of treating or preventing biofilm growth via "on-demand" drug release.
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Affiliation(s)
- P Norris
- Center for Biofilm Engineering, 366 EPS Building, Montana State University--Bozeman, 59717, USA
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21
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Gonçalves IC, Martins MCL, Barbosa MA, Ratner BD. Protein adsorption on 18-alkyl chains immobilized on hydroxyl-terminated self-assembled monolayers. Biomaterials 2005; 26:3891-99. [PMID: 15773038 DOI: 10.1016/j.biomaterials.2004.10.006] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Surfaces of devices that contact blood accumulate adsorbed and denatured proteins perhaps triggering activation of the coagulation system. A renewable layer of albumin would biologically "passivate" the surface and prevent thrombus formation. Based on the approach of selectively binding albumin to fatty acids, different percentages of a compound with 18 carbons (C18) were immobilized on OH-terminated self-assembled monolayers (SAMs). Fourier transform infrared reflection absorption spectroscopy (IRAS), ellipsometry, contact angle (and surface free energy) and X-ray photoelectron spectroscopy (XPS) measurements were used to characterize these surfaces and proved that there is an efficient immobilization of C18. There is an increase of the thickness and hydrophobicity of SAMs with an increasing percentage of C18. Adsorption of human serum albumin (HSA) was evaluated using radiolabelled (125)I-HSA and IRAS. This study showed a gradual increase of HSA adsorption with the increase of surface hydrophobicity. Regarding competitive binding and exchangeability of albumin towards fibrinogen, it was proved, by radiolabelling, that SAMs prepared from solutions with 2.5% C18 presented considerable adsorption in a selective and reversible way.
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Affiliation(s)
- Inês Castro Gonçalves
- INEB-Instituto de Engenharia Biomedica, Laboratório de Biomateriais, Rua do Campo Alegre, 823, 4150-180 Porto, Portugal.
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22
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Li M, Mills DK, Cui T, Mcshane MJ. Cellular Response to Gelatin- and Fibronectin-Coated Multilayer Polyelectrolyte Nanofilms. IEEE Trans Nanobioscience 2005; 4:170-9. [PMID: 16117025 DOI: 10.1109/tnb.2005.850477] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Surface engineering is a critical effort in defining substrates for cell culture and tissue engineering. In this context, multilayer self-assembly is an attractive method for creating novel composites with specialized chemical and physical properties that is currently drawing attention for potential application in this area. In this work, effects of thickness, surface roughness, and surface material of multilayer polymer nanofilms on the growth of rat aortic smooth muscle cells were studied. Polyelectrolyte multilayers (PEMs) electrostatically constructed from poly(allylamine hydrochloride) and poly(sodium 4-styrenesulfonate) (PSS) with gelatin, fibronectin, and PSS surface coatings were evaluated for interactions with smooth muscle cells (SMCs) in an in vitro environment. The results prove that PEMs terminated with cell-adhesive proteins promote the attachment and further growth of SMCs, and that this property is dependent upon the number of layers in the underlying multilayer film architecture. Cell roundness and number of pseudopodia were also influenced by the number of layers in the nanofilms. These findings are significant in that they demonstrate that both surface coatings and underlying architecture of nanofilms affect the morphology and growth of SMCs, which means additional degrees of freedom are available for design of biomaterials. This work supports the excellent potential of nanoassembled ultrathin films for biosurface engineering, and points to a novel perspective for controlling cell-material interaction that can lead to an elegant system for defining the extracellular in vitro environment.
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Affiliation(s)
- Mengyan Li
- Institute for Micromanufacturing, Ruston, LA 71272, USA
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23
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Wang LF, Wei YH, Chen KY, Lin JC, Kuo JF. Properties of phospholipid monolayer deposited on a fluorinated polyurethane. JOURNAL OF BIOMATERIALS SCIENCE-POLYMER EDITION 2005; 15:957-69. [PMID: 15461183 DOI: 10.1163/1568562041526513] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
A simple procedure for surface modification of polyurethane by the Langmuir-Blodgett (LB) method using the amphiphile 1,2-distearoyl-sn-glycero-3-phosphocholine dihydrate (DSPC) was developed. The polyurethane containing the fluorinated moiety was prepared via the perfluoro-containing chain extender 2,2,3,3-tetrafluoro-1,4-butanediol. The fluorinated polyurethane (FPU) films were prepared by spin coating and dipping methods. The spin-coated FPU films exhibited hydrophobic characteristic and, thus, enhanced the transferability of DSPC. Held at constant pressure of 45 mN/m, the DSPC monolayer was transferred successfully to FPU films with a near-unity transfer ratio. The in vitro platelet adhesion assay revealed that the FPU modified with DSPC monolayer was more platelet compatible than the unmodified FPU substrates with no pseudopods and flattening of adherent platelets as well as lower platelet adhesion density. Moreover, the DSPC monolayer remained intact after platelet adhesion testing. In addition, the platelet compatibility of the unmodified FPU was affected by the film preparation methods. This might be attributed to the distinctive surface micromorphology formed. This simple DSPC deposition scheme by a LB technique would be very useful to further enhance the platelet compatibility of hydrophobic substrate and can be utilized for biomedical application in which the flow shear rate is not too high.
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Affiliation(s)
- Li-Fen Wang
- Department of Applied Chemistry, Fooyin University, Kaohsiung, Taiwan 831, ROC.
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24
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Wang LF, Wei YH. Effect of soft segment length on properties of fluorinated polyurethanes. Colloids Surf B Biointerfaces 2005; 41:249-55. [PMID: 15748820 DOI: 10.1016/j.colsurfb.2004.12.014] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2004] [Accepted: 12/21/2004] [Indexed: 10/25/2022]
Abstract
The effects of soft segment length on the variations in morphology, surface composition, and hydrophilicity have been studied in fluorinated polyurethanes (FPUs) and correlated with their preliminary blood compatibility as evidenced by in vitro platelet adhesion experiments. The fluorinated polyurethanes were obtained using hexamethylene diisocyanate (HDI) and chain extender of 2,2,3,3-tetrafluoro-1,4-butanediol (TF) as the hard segment as well as various soft segments-polytetramethyl oxides (PTMO) with molecular weights of 650, 1000, 1400, and 2000. The increased phase separation in hard-segment domains with lengthening soft segment was observed by FT-IR, which is believed to result in enhanced strength of hydrogen bonds and good hard-segment order arrangement. Thin-film XRD results indicate at least three lateral distances existing between adjacent hard segments in the crystallized hard segment. Their distribution depends strongly on the length of soft segment. Lengthening soft segment promotes the formation of dense arrangement of crystallized hard segments. Compared with the effect of phase separation, surface composition was found to exert a major influence on the preliminary blood compatibility of fluorinated polyurethanes. Increasing fluorine content by decreasing soft segment length promotes reduction in platelet adhesion and activation on polyurethane surfaces.
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Affiliation(s)
- Li-Fen Wang
- Department of Applied Chemistry, Fooyin University, Kaohsiung, 831 Taiwan, ROC.
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25
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Gershevitz O, Sukenik CN, Ghabboun J, Cahen D. Molecular monolayer-mediated control over semiconductor surfaces: evidence for molecular depolarization of silane monolayers on Si/SiO(x). J Am Chem Soc 2003; 125:4730-1. [PMID: 12696890 DOI: 10.1021/ja029529h] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We show that, for molecules with particularly strong dipoles, their organization into a monomolecular layer can lead to depolarization, something that limits the range over which the substrate's work function can be changed. It appears that, with molecules, depolarization is achieved by changes in orientation and conformation, rather than by charge transfer to the substrate as is common for atomic layers.
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Affiliation(s)
- Olga Gershevitz
- Chemistry Department, Bar-Ilan University, Ramat Gan 52900, Israel
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26
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Abstract
The ability to deliver therapeutic agents to a patient in a pulsatile or staggered release profile has been a major goal in drug delivery research over the last two decades. This review will cover methods that have been developed to control drug delivery profiles with implantable polymeric systems. Externally and internally controlled systems will be discussed, spanning a range of technologies that include pre-programmed systems, as well as systems that are sensitive to modulated enzymatic or hydrolytic degradation, pH, magnetic fields, ultrasound, electric fields, temperature, light and mechanical stimulation. Implantable systems have the potential to improve the quality of life for patients undergoing therapy with a variable dosing regime by eliminating the need for multiple intravenous injections. Ideally, these systems would also result in increased patient compliance with a given therapy due to the relative ease of self-dosing.
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Affiliation(s)
- S Sershen
- Department of Bioengineering, MS 142, Rice University, Houston, TX 77005, USA
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27
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Abstract
Current research in the field of drug delivery devices, by which pulsed and/or pulsatile release is achieved, has been intensified. In this article several types of drug delivery systems using hydrogels are discussed that showed pulsed and/or pulsatile drug delivery characteristics. As is frequently found in the living body, many vital functions are regulated by pulsed or transient release of bioactive substances at a specific site and time. Thus it is important to develop new drug delivery devices to achieve pulsed delivery of a certain amount of drugs in order to mimic the function of the living systems, while minimizing undesired side effects. Special attention has been given to the thermally responsive poly(N-isopropylacrylamide) and its derivative hydrogels. Thermal stimuli-regulated pulsed drug release is established through the design of drug delivery devices, hydrogels, and micelles. Development of modified alginate gel beads with pulsed drug delivery characteristic is also described in this article.
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Affiliation(s)
- Akihiko Kikuchi
- Institute of Advanced Biomedical Engineering and Science, Tokyo Women's Medical University, 8-1 Kawadacho, Shinjuku, Tokyo 162-8666, Japan
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28
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Kwok CS, Mourad PD, Crum LA, Ratner BD. Self-assembled molecular structures as ultrasonically-responsive barrier membranes for pulsatile drug delivery. JOURNAL OF BIOMEDICAL MATERIALS RESEARCH 2001; 57:151-64. [PMID: 11526905 DOI: 10.1002/1097-4636(200111)57:2<151::aid-jbm1154>3.0.co;2-5] [Citation(s) in RCA: 64] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Noninvasive ultrasound has been shown to increase the release rate on demand from drug delivery systems; however, such systems generally suffer from background drug leaching. To address this issue, a drug-containing polymeric monolith coated with a novel ultrasound-responsive coating was developed. A self-assembled molecular structure coating based on relatively impermeable, ordered methylene chains forms an ultrasound-activated on-off switch in controlling drug release on demand, while keeping the drug inside the polymer carrier in the absence of ultrasound. The orderly structure and molecular orientation of these C12 n-alkyl methylene chains on polymeric surfaces resemble self-assembled monolayers on gold. Their preparation and characterization have been published recently (Kwok et al. [Biomacromolecules 2000;1(1):139-148]). Ultrasound release studies showed that a copolymer of 2-hydroxyethyl methacrylate and ethylene glycol dimethacrylate (MW 400) coated with such an ultrasound-responsive membrane maintained sufficient insulin for multiple insulin delivery, compared with a substantial burst release during the first 2 h from uncoated samples. With appropriate surface coating coverage, the background leach rate can be precisely controlled. The biological activity of the insulin releasate was tested by assessing its ability to regulate [C14]-deoxyglucose uptake in 3T3-L1 adipocyte cells in a controlled cell culture environment. Uptake triggered by released insulin was comparable to that of the positive insulin control. The data demonstrate that the released insulin remains active even after the insulin had been exposed to matrix synthesis and the methylene chain coating process.
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Affiliation(s)
- C S Kwok
- Department of Bioengineering and University of Washington Engineered Biomaterials, Seattle 98195, USA
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