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Chapman CA, Fernandez-Patel S, Jahan N, Cuttaz EA, Novikov A, Goding JA, Green RA. Controlled electroactive release from solid-state conductive elastomer electrodes. Mater Today Bio 2023; 23:100883. [PMID: 38144517 PMCID: PMC10746364 DOI: 10.1016/j.mtbio.2023.100883] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2023] [Revised: 11/14/2023] [Accepted: 11/22/2023] [Indexed: 12/26/2023] Open
Abstract
This work highlights the development of a conductive elastomer (CE) based electrophoretic platform that enables the transfer of charged molecules from a solid-state CE electrode directly to targeted tissues. Using an elastomer-based electrode containing poly (3,4-ethylenedioxythiophene) nanowires, controlled electrophoretic delivery of methylene blue (MB) and fluorescein (FLSC) was achieved with applied voltage. Electroactive release of positively charged MB and negatively charged FLSC achieved 33.19 ± 6.47 μg release of MB and 22.36 ± 3.05 μg release of FLSC, a 24 and 20-fold increase in comparison to inhibitory voltages over 1 h. Additionally, selective, and sequential release of the two oppositely charged molecules from a single CE device was demonstrated, showing the potential of this device to be used in multi-drug treatments.
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Affiliation(s)
- Christopher A.R. Chapman
- School of Engineering and Materials Science, Queen Mary University of London, Mile End, London, E1 4NS, UK
- Department of Bioengineering, Imperial College London, South Kensington, London, SW7 2AZ, UK
| | - Shanila Fernandez-Patel
- Tumour Immunogenomics and Immunosurveillance Laboratory, University College London Cancer Institute, London, UK
| | - Nusrat Jahan
- Department of Bioengineering, Imperial College London, South Kensington, London, SW7 2AZ, UK
| | - Estelle A. Cuttaz
- Department of Bioengineering, Imperial College London, South Kensington, London, SW7 2AZ, UK
| | - Alexey Novikov
- Department of Bioengineering, Imperial College London, South Kensington, London, SW7 2AZ, UK
| | - Josef A. Goding
- Department of Bioengineering, Imperial College London, South Kensington, London, SW7 2AZ, UK
| | - Rylie A. Green
- Department of Bioengineering, Imperial College London, South Kensington, London, SW7 2AZ, UK
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Erythropoietin Nanobots: Their Feasibility for the Controlled Release of Erythropoietin and Their Neuroprotective Bioequivalence in Central Nervous System Injury. APPLIED SCIENCES-BASEL 2022. [DOI: 10.3390/app12073351] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Background: Erythropoietin (EPO) plays important roles in neuroprotection in central nervous system injury. Due to the limited therapeutic time window and coexistence of hematopoietic/extrahematopoietic receptors displaying heterogenic and phylogenetic differences, fast, targeted delivery agents, such as nanobots, are needed. To confirm the feasibility of EPO-nanobots (ENBs) as therapeutic tools, the authors evaluated controlled EPO release from ENBs and compared the neuroprotective bioequivalence of these substances after preconditioning sonication. Methods: ENBs were manufactured by a nanospray drying technique with preconditioning sonication. SH-SY5Y neuronal cells were cotreated with thapsigargin and either EPO or ENBs before cell viability, EPO receptor activation, and endoplasmic reticulum stress-related pathway deactivation were determined over 24 h. Results: Preconditioning sonication (50–60 kHz) for 1 h increased the cumulative EPO release from the ENBs (84% versus 25% at 24 h). Between EPO and ENBs at 24 h, both neuronal cell viability (both > 65% versus 15% for thapsigargin alone) and the expression of the proapoptotic/apoptotic biomolecular markers JAK2, PDI, PERK, GRP78, ATF6, CHOP, TGF-β, and caspase-3 were nearly the same or similar. Conclusion: ENBs controlled EPO release in vitro after preconditioning sonication, leading to neuroprotection similar to that of EPO at 24 h.
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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: 88] [Impact Index Per Article: 44.0] [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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Shin Low S, Nong Lim C, Yew M, Siong Chai W, Low LE, Manickam S, Ti Tey B, Show PL. Recent ultrasound advancements for the manipulation of nanobiomaterials and nanoformulations for drug delivery. ULTRASONICS SONOCHEMISTRY 2021; 80:105805. [PMID: 34706321 PMCID: PMC8555278 DOI: 10.1016/j.ultsonch.2021.105805] [Citation(s) in RCA: 36] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/28/2021] [Revised: 10/08/2021] [Accepted: 10/20/2021] [Indexed: 05/04/2023]
Abstract
Recent advances in ultrasound (US) have shown its great potential in biomedical applications as diagnostic and therapeutic tools. The coupling of US-assisted drug delivery systems with nanobiomaterials possessing tailor-made functions has been shown to remove the limitations of conventional drug delivery systems. The low-frequency US has significantly enhanced the targeted drug delivery effect and efficacy, reducing limitations posed by conventional treatments such as a limited therapeutic window. The acoustic cavitation effect induced by the US-mediated microbubbles (MBs) has been reported to replace drugs in certain acute diseases such as ischemic stroke. This review briefly discusses the US principles, with particular attention to the recent advancements in drug delivery applications. Furthermore, US-assisted drug delivery coupled with nanobiomaterials to treat different diseases (cancer, neurodegenerative disease, diabetes, thrombosis, and COVID-19) are discussed in detail. Finally, this review covers the future perspectives and challenges on the applications of US-mediated nanobiomaterials.
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Affiliation(s)
- Sze Shin Low
- Continental-NTU Corporate Lab, Nanyang Technological University, 50 Nanyang Drive, Singapore 637553, Singapore; Department of Chemical and Environmental Engineering, Faculty of Science and Engineering, University of Nottingham Malaysia, Jalan Broga, Semenyih 43500, Selangor Darul Ehsan, Malaysia
| | - Chang Nong Lim
- School of Engineering and Physical Sciences, Heriot-Watt University Malaysia, No. 1, Jalan Venna P5/2, Precinct 5, Putrajaya 62200, Malaysia
| | - Maxine Yew
- Department of Mechanical, Materials and Manufacturing Engineering, University of Nottingham Ningbo China, 199 Taikang East Road, Ningbo 315100, Zhejiang, China
| | - Wai Siong Chai
- School of Mechanical Engineering and Automation, Harbin Institute of Technology, Shenzhen, Shenzhen 518055, Guangdong, China
| | - Liang Ee Low
- Biofunctional Molecule Exploratory (BMEX) Research Group, School of Pharmacy, Monash University Malaysia, Jalan Lagoon Selatan, Bandar Sunway 47500, Selangor Darul Ehsan, Malaysia; Advanced Engineering Platform, Monash University Malaysia, Jalan Lagoon Selatan, Bandar Sunway 47500, Selangor Darul Ehsan, Malaysia; Institute of Pharmaceutics, College of Pharmaceutical Sciences, Zhejiang University, 866 Yuhangtang Road, Hangzhou 310058, Zhejiang, China.
| | - Sivakumar Manickam
- Petroleum and Chemical Engineering, Faculty of Engineering, Universiti Teknologi Brunei, Jalan Tungku Link Gadong, Bandar Seri Begawan, BE1410, Brunei Darussalam.
| | - Beng Ti Tey
- Advanced Engineering Platform, Monash University Malaysia, Jalan Lagoon Selatan, Bandar Sunway 47500, Selangor Darul Ehsan, Malaysia; Chemical Engineering Discipline, School of Engineering, Monash University Malaysia, Jalan Lagoon Selatan, Bandar Sunway 47500, Selangor Darul Ehsan, Malaysia
| | - Pau Loke Show
- Department of Chemical and Environmental Engineering, Faculty of Science and Engineering, University of Nottingham Malaysia, Jalan Broga, Semenyih 43500, Selangor Darul Ehsan, Malaysia.
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Attia MS, Hassaballah MY, Abdelqawy MA, Emad-Eldin M, Farag AK, Negida A, Ghaith H, Emam SE. An updated review of mesoporous carbon as a novel drug delivery system. Drug Dev Ind Pharm 2021; 47:1029-1037. [PMID: 34590548 DOI: 10.1080/03639045.2021.1988097] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
The nanotechnology approach has been recently adopted to provide more reliable, effective, controlled, and safe drug delivery systems. Nanostructured materials have gained great interest, including siliceous and carbonaceous nanoparticles. The effectiveness of mesoporous carbon nanoparticles (MCNs) in tumor imaging, targeting, and treatment is urging for more future studies. MCNs possess superior properties such as their biocompatibility, large surface area, large pore volume, tunability, and more responsive behavior to internal and external release triggers. These outstanding features make MCNs more applicable for stimuli-responsive drug delivery than the conventional forms of mesoporous silica nanoparticles (MSNs) and other carbon nanoparticles. In this review, we outlined the latest updates regarding the safety, benefits, and potential applications of MCNs.
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Affiliation(s)
- Mohamed S Attia
- Department of Pharmaceutics, Faculty of Pharmacy, Zagazig University, Zagazig, Egypt
| | | | | | - Mahmoud Emad-Eldin
- Department of Pharmacy Practice, Faculty of Pharmacy, Zagazig University, Zagazig, Egypt
| | - Aya K Farag
- Faculty of Pharmacy, Zagazig University, Zagazig, Egypt
| | - Ahmed Negida
- Zagazig University Hospitals, Zagazig University, Zagazig, Egypt.,Faculty of Medicine, Zagazig University, Zagazig, Egypt
| | - Hazem Ghaith
- Faculty of Medicine, Al-Azhar University, Cairo, Egypt
| | - Sherif E Emam
- Department of Pharmaceutics, Faculty of Pharmacy, Zagazig University, Zagazig, Egypt
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Islam MS, Molley TG, Ireland J, Kruzic JJ, Kilian KA. Magnetic Nanocomposite Hydrogels for Directing Myofibroblast Activity in Adipose‐Derived Stem Cells. ADVANCED NANOBIOMED RESEARCH 2021. [DOI: 10.1002/anbr.202000072] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Affiliation(s)
- Md Shariful Islam
- School of Materials Science and Engineering The University of New South Wales Sydney NSW 2052 Australia
| | - Thomas G. Molley
- School of Materials Science and Engineering The University of New South Wales Sydney NSW 2052 Australia
| | - Jake Ireland
- School of Chemistry Australian Centre for Nanomedicine The University of New South Wales Sydney NSW 2052 Australia
| | - Jamie J. Kruzic
- School of Mechanical and Manufacturing Engineering The University of New South Wales Sydney NSW 2052 Australia
| | - Kristopher A. Kilian
- School of Materials Science and Engineering The University of New South Wales Sydney NSW 2052 Australia
- School of Chemistry Australian Centre for Nanomedicine The University of New South Wales Sydney NSW 2052 Australia
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Abstract
Insulin therapy has advanced remarkably over the past few decades. Ultra-rapid-acting and ultra-long-acting insulin analogs are now commercially available. Many additional insulin formulations are in development. This review outlines recent advances in insulin therapy and novel therapies in development.
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Affiliation(s)
- Leah M. Wilson
- Division of Endocrinology, Harold Schnitzer Diabetes Health Center, Oregon Health & Science University, Portland, Oregon, USA
| | - Jessica R. Castle
- Division of Endocrinology, Harold Schnitzer Diabetes Health Center, Oregon Health & Science University, Portland, Oregon, USA
- Address correspondence to: Jessica R. Castle, MD, Division of Endocrinology, Harold Schnitzer Diabetes Health Center, Oregon Health & Science University, 3181 SW Sam Jackson Park Road, L607, Portland, OR 97239-3098, USA
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8
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Hosseini SH, Zohreh N, Karimi N, Gaeini N, Alipour S, Seidi F, Gholipour N. Magnetic nanoparticles double wrapped into cross-linked salep/PEGylated carboxymethyl cellulose; a biocompatible nanocarrier for pH-triggered release of doxorubicin. Int J Biol Macromol 2020; 158:994-1006. [PMID: 32434748 DOI: 10.1016/j.ijbiomac.2020.05.040] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2020] [Revised: 05/03/2020] [Accepted: 05/05/2020] [Indexed: 12/17/2022]
Abstract
A magnetic nanocarrier was synthesized in which Fe3O4 nanoparticles were encapsulated into double layers of polysaccharide shells. The first shell, which was composed of cross-linked salep polysaccharide, contained multiple nitrogen atoms in its structure and provided numerous sites for multiple functionalization. A fluorescence dye and doxorubicin, as widely used chemotherapy agent, were easily attached to the first shell and then a second shell of PEGylated carboxymethyl cellulose enveloped the drug loaded carrier to enhance its biocompatibility and regulates the drug release behavior. The results of drug loading and release behavior showed that the resulting nanocarrier can carry large amounts of drug molecules and a remarkable pH-sensitive release was observed in vitro. The hemolysis and coagulation assays proved the biocompatibility of nanocarrier toward red blood cells and the MTT experiments confirmed that the drug loaded nanocarrier is highly toxic for MCF-7 cancer cells while the unloaded nanocarrier was almost nontoxic. Further flow cytometry experiments and confocal microscopy demonstrated that the double layered magnetic nanocarrier can penetrate into the cells and efficiently release the drug molecules into the cell nucleus. Moreover, the results of MRI experiments performed on the nanocarrier showed that it can be serve as a negative MRI contrast agent.
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Affiliation(s)
- Seyed Hassan Hosseini
- Department of Chemical Engineering, University of Science and Technology of Mazandaran, Behshahr, Iran.
| | - Nasrin Zohreh
- Department of Chemistry, Faculty of Science, University of Qom, Qom, Iran.
| | - Nafiseh Karimi
- Department of Chemistry, Faculty of Science, University of Qom, Qom, Iran
| | - Nahid Gaeini
- Department of Chemistry, Faculty of Science, University of Qom, Qom, Iran
| | - Sakineh Alipour
- Department of Chemistry, Faculty of Science, University of Qom, Qom, Iran
| | - Farzad Seidi
- Provincial Key Lab of Pulp and Paper Science and Technology and Joint International Research Lab of Lignocellulosic Functional Materials, Nanjing Forestry University, Nanjing 210037, China
| | - Nazila Gholipour
- Chemical Injuries Research Center, Faculty of Pharmacy, System Biology and Poisonings Institute, Baqiyatallah University of Medical Sciences, Tehran, Iran
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Qureshi D, Nayak SK, Maji S, Anis A, Kim D, Pal K. Environment sensitive hydrogels for drug delivery applications. Eur Polym J 2019. [DOI: 10.1016/j.eurpolymj.2019.109220] [Citation(s) in RCA: 40] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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Ni R, Liu J, Chau Y. Ultrasound-facilitated assembly and disassembly of a pH-sensitive self-assembly peptide. RSC Adv 2018; 8:29482-29487. [PMID: 35548023 PMCID: PMC9084454 DOI: 10.1039/c8ra04391d] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2018] [Accepted: 08/12/2018] [Indexed: 12/23/2022] Open
Abstract
In this report, we investigated the impact of external stimulus (ultrasound) and internal stimulus (pH) on peptide assembly and disassembly. Two short rationally designed peptides K3C6SPD and F20H differing in the presence of a single pH-sensitive histidine residue were studied as the model peptides. The assembly kinetics studies demonstrated that the substitution of phenylalanine in K3C6SPD with histidine (F20H) significantly slowed down the peptide assembly rate at all three tested pHs (pH 9.5, pH 7.4 and pH 5.0). At the same time, this F to H substitution led to the increased pH-responsive assembly kinetics. By treating the peptide sample at the beginning of the assembly process at pH 9.5 for 5 min with the ultrasound power of 2.1 W cm−2, the assembly rate of peptide F20H was significantly accelerated with the lag phase being shortened from 10 days to 2 days. For the disassembly of F20H peptide nanofibrils preformed at pH 9.5, upon pH adjustment from pH 9.5 to pH 5.0, 5 min ultrasonication of the nanofibrils resulted in the nanofibril disassembly within 6 hours, instead of 5 days in the absence of ultrasound. On the contrary, similar ultrasound treatment of the peptide K3C6SPD did not produce any obvious effect on both assembly and disassembly processes. This study offers an effective strategy to modulate the stimuli-responsiveness of the peptide-based biomaterials. We present an efficient strategy to enhance the stimuli-responsiveness of peptide-based biomaterials by combination of different stimuli.![]()
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Affiliation(s)
- Rong Ni
- Department of Chemical and Biological Engineering
- The Hong Kong University of Science and Technology
- Kowloon
- China
- Institute for Advanced Study
| | - Jianhui Liu
- Department of Chemical and Biological Engineering
- The Hong Kong University of Science and Technology
- Kowloon
- China
| | - Ying Chau
- Department of Chemical and Biological Engineering
- The Hong Kong University of Science and Technology
- Kowloon
- China
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Jalili NA, Jaiswal MK, Peak CW, Cross LM, Gaharwar AK. Injectable nanoengineered stimuli-responsive hydrogels for on-demand and localized therapeutic delivery. NANOSCALE 2017; 9:15379-15389. [PMID: 28975171 PMCID: PMC5702913 DOI: 10.1039/c7nr02327h] [Citation(s) in RCA: 50] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
"Smart" hydrogels are an emerging class of biomaterials that respond to external stimuli and have been investigated for a range of biomedical applications, including therapeutic delivery and regenerative engineering. Stimuli-responsive nanogels constructed of thermoresponsive polymers such as poly(N-isopropylacrylamide-co-acrylamide) (poly(NIPAM-co-AM)) and magnetic nanoparticles (MNPs) have been developed as "smart carriers" for on-demand delivery of therapeutic biomolecules via magneto-thermal activation. However, due to their small size and systemic introduction, these poly(NIPAM-co-AM)/MNP nanogels result in limited control over long-term, localized therapeutic delivery. Here, we developed an injectable nanoengineered hydrogel loaded with poly(NIPAM-co-AM)/MNPs for localized, on-demand delivery of therapeutics (doxorubicin (DOX)). We have engineered shear-thinning and self-recoverable hydrogels by modulating the crosslinking density of a gelatin methacrylate (GelMA) network. Poly(NIPAM-co-AM)/MNP nanogels loaded with DOX were entrapped within a GelMA pre-polymer solution prior to crosslinking. The temperature and magnetic field dependent release of loaded DOX was observed from the nanoengineered hydrogels (GelMA/(poly(NIPAM-co-AM)/MNPs)). Finally, the in vitro efficacy of DOX released from injectable nanoengineered hydrogels was investigated using preosteoblast and osteosarcoma cells. Overall, these results demonstrated that the injectable nanoengineered hydrogels could be used for on-demand and localized therapeutic delivery for biomedical applications.
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Affiliation(s)
- Nima A Jalili
- Department of Biomedical Engineering, Texas A&M University, College Station, TX-77843, USA.
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Rovers SA, Kemmere MF, Keurentjes JTF, Hoogenboom R. Repetitive on-demand drug release from polymeric matrices containing a macroscopic spherical iron core. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2017; 28:163. [PMID: 28914395 DOI: 10.1007/s10856-017-5983-7] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/10/2017] [Accepted: 09/01/2017] [Indexed: 06/07/2023]
Abstract
UNLABELLED A system for multiple on-demand drug release has been prepared that can be activated with an alternating magnetic field as external trigger. The core/shell samples have been developed based on a macroscopic spherical iron core coated with a thermoresponsive polymer, poly(styrene-stat-butyl methacrylate), containing ibuprofen as a model drug. During exposure of the samples to the magnetic field (ON state), the release rate of ibuprofen is significantly increased, up to 35 times the release rate without the magnetic field (OFF state). Using one sample or two samples in line with the magnetic field does not influence the ON/OFF ratio of the system, showing the possibility of using multiple samples to increase and tune the drug dose. Increasing the concentration of ibuprofen in the polymer layer is shown to increase the release rate in both the ON and OFF states. Increasing the size of the iron core and, consequently, decreasing the polymer thickness, was found to only increase the release rate during exposure resulting in higher ON/OFF ratios. The developed on demand drug delivery systems represents a promising development towards on demand drug delivery implants. REFLECTIONS ON CAREER GOALS During my chemical engineering studies, it was only during my master thesis work that I decided to continue with PhD research as I really enjoyed doing original research. When coming to the end of my PhD research under supervision of Prof. Ulrich S. Schubert, I developed the ambition to pursue an academic career. Fortunately, I got the opportunity to stay with Prof. Schubert as project leader for the Dutch Polymer Institute (DPI). Within this position, I supervised ten researchers and was able to start developing my independent research lines. Despite that I now advise students to not stay in the same laboratory, this first position allowed me to gain some initial independence and to publish a large number of papers that has been a great benefit in my further career. After two and a half years I needed a new challenge that I found by taking up a part-time position at a start-up company in Eindhoven, Dolphys Medical BV, while I also continued as part-time group leader for the DPI. As senior product developer, I was in charge of the research and learned to focus on the application rather than scientific curiosity. This experience made me realize that I prefer the freedom to do academic blue sky research and decided to fully go for an academic position. After personal discussions with some prominent professors in the Netherlands, I applied for a postdoc fellowship in the Netherlands with Prof. Roeland Nolte as well as a Humboldt fellowship in Germany with Prof. Martin Möller, which I both got. As a result, I went one year 'abroad' to Aachen and returned to Nijmegen where I intended to start my independent career. However, another opportunity came along. Via my personal network I was informed that I would make a good chance if I applied for a new professor scheme in Ghent. So I applied and the rest is history. Picture of the Supramolecular Chemistry Group (2017).
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Affiliation(s)
- Stefan A Rovers
- Process Development Group, Department of Chemical Engineering and Chemistry, Eindhoven University of Technology, P.O. Box 513, 5600 MB, Eindhoven, The Netherlands
| | - Maartje F Kemmere
- Process Development Group, Department of Chemical Engineering and Chemistry, Eindhoven University of Technology, P.O. Box 513, 5600 MB, Eindhoven, The Netherlands
| | - Jos T F Keurentjes
- Process Development Group, Department of Chemical Engineering and Chemistry, Eindhoven University of Technology, P.O. Box 513, 5600 MB, Eindhoven, The Netherlands
| | - Richard Hoogenboom
- Dolphys Medical, Den Dolech 2, 5612 AZ, Eindhoven, The Netherlands.
- Supramolecular Chemistry Group, Centre of Macromolecular Chemistry (CMaC), Department of Organic and Macromolecular Chemistry, Ghent University, Krijgslaan 281-S4, 9000, Ghent, Belgium.
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14
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Huang WC, Ali F, Zhao J, Rhee K, Mou C, Bettinger CJ. Ultrasound-Mediated Self-Healing Hydrogels Based on Tunable Metal-Organic Bonding. Biomacromolecules 2017; 18:1162-1171. [PMID: 28245355 DOI: 10.1021/acs.biomac.6b01841] [Citation(s) in RCA: 61] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Stimulus-responsive hydrogels make up an important class of programmable materials for a wide range of biomedical applications. Ultrasound (US) is a stimulus that offers utility because of its ability to permeate tissue and rapidly induce chemical alterations in aqueous media. Here we report on the synthesis and US-mediated disintegration of stimulus-responsive telechelic Dopa-modified polyethylene glycol-based hydrogels. Fe3+-[PEG-Dopa]4 hydrogels are formed through Fe3+-induced cross-linking of four-arm polyethylene glycol-dopamine precursors to produce networks. The relative amounts of H-bonds, coordination bonds, and covalent bonds can be controlled by the [Fe3+]:[Dopa] molar ratio in precursor solutions. Networks formed from precursors with high [Fe3+]:[Dopa] ratios create mechanically robust networks (G' = 6880 ± 240 Pa) that are largely impervious to US-mediated disintegration at intensities of ≤43 W/cm2. Conversely, lightly cross-linked networks formed through [Fe3+]:[Dopa] molar ratios of <0.73 are susceptible to rapid disintegration upon exposure to US. Pulsatile US exposure allows temporal control over hydrogel disintegration and programmable self-healing. Sustained US energy can also stabilize hydrogels through the formation of additional cross-links via free radical-mediated coupling of pendant catechols. Taken together, the diverse ranges of mechanical behavior, self-healing capability, and differential susceptibility to ultrasonic disintegration suggest that Fe3+-[PEG-Dopa]4 hydrogels yield a class of application-specific stimulus-responsive polymers as smart materials for applications ranging from transient medical implants to matrices for smart drug delivery.
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Affiliation(s)
- Wei-Chen Huang
- Graduate Institute of Biomedical Materials and Tissue Engineering, Taipei Medical University , 250 Wu-Xing Street, Taipei City, 30010 Taiwan
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15
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Jalili NA, Muscarello M, Gaharwar AK. Nanoengineered thermoresponsive magnetic hydrogels for biomedical applications. Bioeng Transl Med 2016; 1:297-305. [PMID: 29313018 PMCID: PMC5689536 DOI: 10.1002/btm2.10034] [Citation(s) in RCA: 55] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2016] [Revised: 08/18/2016] [Accepted: 08/26/2016] [Indexed: 01/03/2023] Open
Abstract
“Smart” hydrogels are part of an emerging class of biomaterials that respond to multiple external stimuli. A range of thermoresponsive magnetic hydrogels is currently being developed for on‐demand delivery of biomolecules for a range of biomedical applications, including therapeutic drug delivery, bioimaging, and regenerative engineering. In this review article, we explore different types of magnetic nanoparticles and thermoresponsive polymers used to fabricate these smart nanoengineered hydrogels. We highlight some of the emerging applications of these stimuli‐responsive hydrogels for biomedical applications. Finally, we capture the growing trend of these smart nanoengineered hydrogels and will identify promising new research directions.
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Affiliation(s)
- Nima A Jalili
- Dept. of Biomedical Engineering Texas A&M University, College Station TX 77843
| | - Madyson Muscarello
- Dept. of Biomedical Engineering Texas A&M University, College Station TX 77843
| | - Akhilesh K Gaharwar
- Dept. of Biomedical Engineering Texas A&M University, College Station TX 77843.,Dept. of Materials Science and Engineering Texas A&M University, College Station TX 77843.,Center for Remote Health Technologies and Systems, Texas A&M University, College Station TX 77843
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16
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Affiliation(s)
- Yuqi Zhang
- Joint
Department of Biomedical Engineering, University of North Carolina at Chapel Hill and North Carolina State University, Raleigh, North Carolina 27695, United States
- Center
for Nanotechnology in Drug Delivery and Division of Molecular Pharmaceutics,
UNC Eshelman School of Pharmacy, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
- Department
of Mechanical and Aerospace Engineering, North Carolina State University, Raleigh, North Carolina 27695, United States
| | - Jicheng Yu
- Joint
Department of Biomedical Engineering, University of North Carolina at Chapel Hill and North Carolina State University, Raleigh, North Carolina 27695, United States
- Center
for Nanotechnology in Drug Delivery and Division of Molecular Pharmaceutics,
UNC Eshelman School of Pharmacy, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
| | - Hunter N. Bomba
- Joint
Department of Biomedical Engineering, University of North Carolina at Chapel Hill and North Carolina State University, Raleigh, North Carolina 27695, United States
| | - Yong Zhu
- Joint
Department of Biomedical Engineering, University of North Carolina at Chapel Hill and North Carolina State University, Raleigh, North Carolina 27695, United States
- Department
of Mechanical and Aerospace Engineering, North Carolina State University, Raleigh, North Carolina 27695, United States
| | - Zhen Gu
- Joint
Department of Biomedical Engineering, University of North Carolina at Chapel Hill and North Carolina State University, Raleigh, North Carolina 27695, United States
- Center
for Nanotechnology in Drug Delivery and Division of Molecular Pharmaceutics,
UNC Eshelman School of Pharmacy, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
- Department
of Medicine, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
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17
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Yu J, Zhang Y, Bomba H, Gu Z. Stimuli-Responsive Delivery of Therapeutics for Diabetes Treatment. Bioeng Transl Med 2016; 1:323-337. [PMID: 29147685 PMCID: PMC5685194 DOI: 10.1002/btm2.10036] [Citation(s) in RCA: 67] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2016] [Revised: 09/07/2016] [Accepted: 09/13/2016] [Indexed: 12/12/2022] Open
Abstract
Diabetic therapeutics, including insulin and glucagon-like peptide 1 (GLP-1), are essential for diabetic patients to regulate blood glucose levels. However, conventional treatments that are based on subcutaneous injections are often associated with poor glucose control and a lack of patient compliance. In this review, we focus on the different stimuli-responsive systems to deliver therapeutics for diabetes treatment to improve patient comfort and prevent complications. Specifically, the pH-responsive systems for oral drug delivery are introduced first. Then, the closed-loop glucose-responsive systems are summarized based on different glucose-responsive moieties, including glucose oxidase (GOx), glucose binding protein (GBP), and phenylboronic acid (PBA). Finally, the on-demand delivery systems activated by external remote triggers are also discussed. We conclude by discussing advantages and limitations of current strategies, as well as future opportunities and challenges in this area.
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Affiliation(s)
- Jicheng Yu
- Joint Dept. of Biomedical EngineeringUniversity of North Carolina at Chapel Hill and North Carolina State UniversityRaleighNC27695
- Center for Nanotechnology in Drug Delivery and Division of Molecular Pharmaceutics, UNC Eshelman School of PharmacyUniversity of North Carolina at Chapel HillChapel HillNC27599
| | - Yuqi Zhang
- Joint Dept. of Biomedical EngineeringUniversity of North Carolina at Chapel Hill and North Carolina State UniversityRaleighNC27695
- Center for Nanotechnology in Drug Delivery and Division of Molecular Pharmaceutics, UNC Eshelman School of PharmacyUniversity of North Carolina at Chapel HillChapel HillNC27599
| | - Hunter Bomba
- Joint Dept. of Biomedical EngineeringUniversity of North Carolina at Chapel Hill and North Carolina State UniversityRaleighNC27695
| | - Zhen Gu
- Joint Dept. of Biomedical EngineeringUniversity of North Carolina at Chapel Hill and North Carolina State UniversityRaleighNC27695
- Center for Nanotechnology in Drug Delivery and Division of Molecular Pharmaceutics, UNC Eshelman School of PharmacyUniversity of North Carolina at Chapel HillChapel HillNC27599
- Dept. of MedicineUniversity of North Carolina at Chapel HillChapel HillNC27599
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18
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Das S, Banik M, Chen G, Sinha S, Mukherjee R. Polyelectrolyte brushes: theory, modelling, synthesis and applications. SOFT MATTER 2015; 11:8550-83. [PMID: 26399305 DOI: 10.1039/c5sm01962a] [Citation(s) in RCA: 97] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Polyelectrolyte (PE) brushes are a special class of polymer brushes (PBs) containing charges. Polymer chains attain "brush"-like configuration when they are grafted or get localized at an interface (solid-fluid or liquid-fluid) with sufficiently close proximity between two-adjacent grafted polymer chains - such a proximity triggers a particular nature of interaction between the adjacent polymer molecules forcing them to stretch orthogonally to the grafting interface, instead of random-coil arrangement. In this review, we discuss the theory, synthesis, and applications of PE brushes. The theoretical discussion starts with the standard scaling concepts for polymer and PE brushes; following that, we shed light on the state of the art in continuum modelling approaches for polymer and PE brushes directed towards analysis beyond the scaling calculations. A special emphasis is laid in pinpointing the cases for which the PE electrostatic effects can be de-coupled from the PE entropic and excluded volume effects; such de-coupling is necessary to appropriately probe the complicated electrostatic effects arising from pH-dependent charging of the PE brushes and the use of these effects for driving liquid and ion transport at the interfaces covered with PE brushes. We also discuss the atomistic simulation approaches for polymer and PE brushes. Next we provide a detailed review of the existing approaches for the synthesis of polymer and PE brushes on interfaces, nanoparticles, and nanochannels, including mixed brushes and patterned brushes. Finally, we discuss some of the possible applications and future developments of polymer and PE brushes grafted on a variety of interfaces.
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Affiliation(s)
- Siddhartha Das
- Department of Mechanical Engineering, University of Maryland, College Park, MD-20742, USA.
| | - Meneka Banik
- Instability and Soft Patterning Laboratory, Department of Chemical Engineering, Indian Institute of Technology Kharagpur, Pin - 721302, Kharagpur, West Bengal, India
| | - Guang Chen
- Department of Mechanical Engineering, University of Maryland, College Park, MD-20742, USA.
| | - Shayandev Sinha
- Department of Mechanical Engineering, University of Maryland, College Park, MD-20742, USA.
| | - Rabibrata Mukherjee
- Instability and Soft Patterning Laboratory, Department of Chemical Engineering, Indian Institute of Technology Kharagpur, Pin - 721302, Kharagpur, West Bengal, India
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19
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20
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On-demand drug delivery from local depots. J Control Release 2015; 219:8-17. [PMID: 26374941 DOI: 10.1016/j.jconrel.2015.09.011] [Citation(s) in RCA: 92] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2015] [Revised: 09/08/2015] [Accepted: 09/08/2015] [Indexed: 11/22/2022]
Abstract
Stimuli-responsive polymeric depots capable of on-demand release of therapeutics promise a substantial improvement in the treatment of many local diseases. These systems have the advantage of controlling local dosing so that payload is released at a time and with a dose chosen by a physician or patient, and the dose can be varied as disease progresses or healing occurs. Macroscale drug depot can be induced to release therapeutics through the action of physical stimuli such as ultrasound, electric and magnetic fields and light as well as through the addition of pharmacological stimuli such as nucleic acids and small molecules. In this review, we highlight recent advances in the development of polymeric systems engineered for releasing therapeutic molecules through physical and pharmacological stimulation.
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21
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Ultrasound-triggered disruption and self-healing of reversibly cross-linked hydrogels for drug delivery and enhanced chemotherapy. Proc Natl Acad Sci U S A 2014; 111:9762-7. [PMID: 24961369 DOI: 10.1073/pnas.1405469111] [Citation(s) in RCA: 273] [Impact Index Per Article: 27.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Biological systems are exquisitely sensitive to the location and timing of physiologic cues and drugs. This spatiotemporal sensitivity presents opportunities for developing new therapeutic approaches. Polymer-based delivery systems are used extensively for attaining localized, sustained release of bioactive molecules. However, these devices typically are designed to achieve a constant rate of release. We hypothesized that it would be possible to create digital drug release, which could be accelerated and then switched back off, on demand, by applying ultrasound to disrupt ionically cross-linked hydrogels. We demonstrated that ultrasound does not permanently damage these materials but enables nearly digital release of small molecules, proteins, and condensed oligonucleotides. Parallel in vitro studies demonstrated that the concept of applying temporally short, high-dose "bursts" of drug exposure could be applied to enhance the toxicity of mitoxantrone toward breast cancer cells. We thus used the hydrogel system in vivo to treat xenograft tumors with mitoxantrone, and found that daily ultrasound-stimulated drug release substantially reduced tumor growth compared with sustained drug release alone. This approach of digital drug release likely will be applicable to a broad variety of polymers and bioactive molecules, and is a potentially useful tool for studying how the timing of factor delivery controls cell fate in vivo.
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22
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Mo R, Jiang T, Di J, Tai W, Gu Z. Emerging micro- and nanotechnology based synthetic approaches for insulin delivery. Chem Soc Rev 2014; 43:3595-629. [PMID: 24626293 DOI: 10.1039/c3cs60436e] [Citation(s) in RCA: 276] [Impact Index Per Article: 27.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Insulin is essential for type 1 and advanced type 2 diabetics to maintain blood glucose levels and prolong lives. The traditional administration requires frequent subcutaneous insulin injections that are associated with poor patient compliance, including pain, local tissue necrosis, infection, and nerve damage. Taking advantage of emerging micro- and nanotechnologies, numerous alternative strategies integrated with chemical approaches for insulin delivery have been investigated. This review outlines recent developments in the controlled delivery of insulin, including oral, nasal, pulmonary, transdermal, subcutaneous and closed-loop insulin delivery. Perspectives from new materials, formulations and devices at the micro- or nano-scales are specifically surveyed. Advantages and limitations of current delivery methods, as well as future opportunities and challenges are also discussed.
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Affiliation(s)
- Ran Mo
- Joint Department of Biomedical Engineering, University of North Carolina at Chapel Hill and North Carolina State University, Raleigh, NC 27695, USA.
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23
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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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24
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Yohe ST, Kopechek JA, Porter TM, Colson YL, Grinstaff MW. Triggered drug release from superhydrophobic meshes using high-intensity focused ultrasound. Adv Healthc Mater 2013; 2:1204-8. [PMID: 23592698 DOI: 10.1002/adhm.201200381] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2012] [Indexed: 11/07/2022]
Abstract
Application of high-intensity focused ultrasound to drug-loaded superhydrophobic meshes affords triggered drug release by displacing an entrapped air layer. The air layer within the superhydrophobic meshes is characterized using direct visualization and B-mode imaging. Drug-loaded superhydrophobic meshes are cytotoxic in an in vitro assay after ultrasound treatment.
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Affiliation(s)
- Stefan T Yohe
- Departments of Biomedical Engineering and Chemistry, Boston University, Boston, MA 02215
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25
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Demirel GB, von Klitzing R. A New Multiresponsive Drug Delivery System using Smart Nanogels. Chemphyschem 2013; 14:2833-40. [DOI: 10.1002/cphc.201300149] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2013] [Revised: 05/07/2013] [Indexed: 11/10/2022]
Affiliation(s)
- Gökçen Birlik Demirel
- Department of Chemistry, Faculty of Art and Literature, Gazi University, 06900 Polatli, Ankara (Turkey)
- Stranski‐Laboratorium für Physikalische und Theoretische Chemie, Institut für Chemie, Technische Universität Berlin, Straße des 17. Juni 124, 10623 Berlin (Germany)
| | - Regine von Klitzing
- Stranski‐Laboratorium für Physikalische und Theoretische Chemie, Institut für Chemie, Technische Universität Berlin, Straße des 17. Juni 124, 10623 Berlin (Germany)
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26
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Bao M, Zhou Q, Dong W, Lou X, Zhang Y. Ultrasound-Modulated Shape Memory and Payload Release Effects in a Biodegradable Cylindrical Rod Made of Chitosan-Functionalized PLGA Microspheres. Biomacromolecules 2013; 14:1971-9. [DOI: 10.1021/bm4003464] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Min Bao
- State Key Laboratory for Modification of Chemical Fibers
and Polymer Materials, Donghua University, Shanghai 201620, China
- College of Chemistry,
Chemical Engineering and Biotechnology, Donghua University, Shanghai 201620, China
| | - Qihui Zhou
- State Key Laboratory for Modification of Chemical Fibers
and Polymer Materials, Donghua University, Shanghai 201620, China
- College of Chemistry,
Chemical Engineering and Biotechnology, Donghua University, Shanghai 201620, China
| | - Wen Dong
- State Key Laboratory for Modification of Chemical Fibers
and Polymer Materials, Donghua University, Shanghai 201620, China
- College of Chemistry,
Chemical Engineering and Biotechnology, Donghua University, Shanghai 201620, China
| | - Xiangxin Lou
- State Key Laboratory for Modification of Chemical Fibers
and Polymer Materials, Donghua University, Shanghai 201620, China
- College of Chemistry,
Chemical Engineering and Biotechnology, Donghua University, Shanghai 201620, China
| | - Yanzhong Zhang
- State Key Laboratory for Modification of Chemical Fibers
and Polymer Materials, Donghua University, Shanghai 201620, China
- College of Chemistry,
Chemical Engineering and Biotechnology, Donghua University, Shanghai 201620, China
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27
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Dadsetan M, Taylor KE, Yong C, Bajzer Ž, Lu L, Yaszemski MJ. Controlled release of doxorubicin from pH-responsive microgels. Acta Biomater 2013; 9:5438-46. [PMID: 23022545 PMCID: PMC3970914 DOI: 10.1016/j.actbio.2012.09.019] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2012] [Revised: 09/13/2012] [Accepted: 09/18/2012] [Indexed: 10/27/2022]
Abstract
Stimuli-responsive hydrogels have enormous potential in drug delivery applications. They can be used for site-specific drug delivery due to environmental variables in the body such as pH and temperature. In this study, we have developed pH-responsive microgels for the delivery of doxorubicin (DOX) in order to optimize its anti-tumor activity while minimizing its systemic toxicity. We used a copolymer of oligo(polyethylene glycol) fumarate (OPF) and sodium methacrylate (SMA) to fabricate the pH-responsive microgels. We demonstrated that the microgels were negatively charged, and the amounts of charge on the microgels were correlated with the SMA concentration in their formulation. The resulting microgels exhibited sensitivity to the pH and ionic strength of the surrounding environment. We demonstrated that DOX was efficiently loaded into the microgels and released in a controlled fashion via an ion-exchange mechanism. Our data revealed that the DOX release was influenced by the pH and ionic strength of the solution. Moreover, we designed a phenomenological mathematical model, based on a stretched exponential function, to quantitatively analyze the cumulative release of DOX. We found a linear correlation between the maximum release of DOX calculated from the model and the SMA concentration in the microgel formulation. The anti-tumor activity of the released DOX was assessed using a human chordoma cell line. Our data revealed that OPF-SMA microgels prolonged the cell killing effect of DOX.
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Affiliation(s)
- Mahrokh Dadsetan
- Department of Orthopedic Surgery, Mayo Clinic, Rochester, MN 55905, USA
- Department of Biomedical Engineering, Mayo Clinic, Rochester, MN, USA
| | - K. Efua Taylor
- Department of Orthopedic Surgery, Mayo Clinic, Rochester, MN 55905, USA
- Department of Biomedical Engineering, Mayo Clinic, Rochester, MN, USA
| | - Chun Yong
- Department of Orthopedic Surgery, Mayo Clinic, Rochester, MN 55905, USA
- Department of Biomedical Engineering, Mayo Clinic, Rochester, MN, USA
| | - Željko Bajzer
- Department of Biomedical Engineering, Mayo Clinic, Rochester, MN, USA
- Department of Biochemistry and Molecular Biology, Mayo Clinic, Rochester, MN, USA
| | - Lichun Lu
- Department of Orthopedic Surgery, Mayo Clinic, Rochester, MN 55905, USA
- Department of Biomedical Engineering, Mayo Clinic, Rochester, MN, USA
| | - Michael J. Yaszemski
- Department of Orthopedic Surgery, Mayo Clinic, Rochester, MN 55905, USA
- Department of Biomedical Engineering, Mayo Clinic, Rochester, MN, USA
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28
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Chang MW, Edirisinghe M, Stride E. Ultrasound mediated release from stimuli-responsive core–shell capsules. J Mater Chem B 2013; 1:3962-3971. [DOI: 10.1039/c3tb20465k] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
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29
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Tong R, Xia H, Lu X. Fast release behavior of block copolymer micelles under high intensity focused ultrasound/redox combined stimulus. J Mater Chem B 2013; 1:886-894. [DOI: 10.1039/c2tb00222a] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
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30
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Abstract
Microfluidic systems allow small volumes of liquids to be manipulated, either by being passed through channels or moved around as liquid droplets. Such systems have been developed to separate, purify, analyze, and deliver molecules to reaction zones. Although volumes are small, reaction rates, catalysis, mixing, and heat transfer can be high, enabling the accurate sensing of tiny quantities of agents and the synthesis of novel products. The incorporation of multiple components, such as pumps, valves, mixers, and heaters, onto a single microfluidic platform has brought about the field of lab-on-a-chip devices or micro total analysis systems (μTAS). Although used in the research laboratory for numerous years, few of these devices have made it into the commercial market, due to their complexity of fabrication and limited choice of material. As the dimensions of these systems become smaller, interfacial interactions begin to dominate in terms of device performance. Appropriate selection of bulk materials, or the application of surface coatings, can allow control over surface properties, such as the adsorption of (bio)molecules. Here we review current microfluidic technology in terms of biocompatibility issues, examining the use of modification strategies to improve device longevity and performance.
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Affiliation(s)
- N J Shirtcliffe
- Biomimetic Materials, Hochschule Rhein-Waal, Rhine-Waal University of Applied Sciences, Kleve, Germany
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31
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Yu H, Chen S, Cao P. Synergistic bactericidal effects and mechanisms of low intensity ultrasound and antibiotics against bacteria: a review. ULTRASONICS SONOCHEMISTRY 2012; 19:377-82. [PMID: 22153228 DOI: 10.1016/j.ultsonch.2011.11.010] [Citation(s) in RCA: 61] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/07/2011] [Revised: 11/14/2011] [Accepted: 11/15/2011] [Indexed: 05/05/2023]
Abstract
Low intensity ultrasonic therapy is always an important research area of ultrasonic medicine. This review concentrates on low intensity ultrasound enhancing bactericidal action of antibiotics against bacteria in vitro and in vivo, including planktonic bacteria, bacterial biofilms, Chlamydia, and bacteria in implants. These literatures show that low intensity ultrasound alone is not effective in killing bacteria, while the combination of low intensity ultrasound and antibiotics is promising. Low intensity ultrasound facilitating antibiotic treatment is still in its infancy, and still requires a great deal of research in order to develop the technology on medical treatment scale.
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Affiliation(s)
- Hao Yu
- Biomedical Engineering Department, Zhejiang University, Hangzhou Zhejiang 310027, China.
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32
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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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34
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Liu TY, Huang TC. A novel drug vehicle capable of ultrasound-triggered release with MRI functions. Acta Biomater 2011; 7:3927-34. [PMID: 21745611 DOI: 10.1016/j.actbio.2011.06.038] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2011] [Revised: 05/30/2011] [Accepted: 06/22/2011] [Indexed: 10/18/2022]
Abstract
A novel remotely triggered drug vehicle, magnetic hydroxyapatite (HA)-coated liposome (i.e. HA-coated liposome decorated with superparamagnetic iron oxide (SPIO) nanodots; HA/SPIO-coated liposome), was developed to exhibit ultrasound-triggered release behavior, magnetic resonance imaging (MRI) contrast and ultrasound-induced MRI contrast change. In this study, the effects of the HA/SPIO coating layer on the background leakage, response to ultrasound and MR signal were investigated. The background leakage of the liposome was significantly reduced due to HA/SPIO coating of the liposome. This coating layer also enhanced the sensitivity of the drug vehicle to ultrasound under sonication conditions at high frequencies (1 and 3 MHz) and low power densities (0.2-0.4 W cm(-2)). Moreover, the ultrasound-triggered vehicle exhibited a concentration-dependent T(2) (spin-spin relaxation time) contrast in MR images due to their decoration with SPIO nanodots. In addition, r(2) and r(2)(∗) (transverse relaxivity) values increased with increasing amounts of SPIO decoration, suggesting that the MR images of HA/SPIO-coated liposomes could be probed by the T(2) signal. Most importantly, the r(2)(∗)-r(2) value of HA/SPIO-coated liposomes decreased after sonication, which was more prominent for the sample with lower SPIO amounts. This suggests that this novel drug vehicle can be used not only as an MR image-guided drug vehicle capable of ultrasound-triggered release, but also as an MR reporter to probe the status of vehicles after ultrasonic triggering.
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35
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Liu TY, Huang HH, Chen YJ, Chen YJ. Study of a novel ultrasonically triggered drug vehicle with magnetic resonance properties. Acta Biomater 2011; 7:578-84. [PMID: 20854938 DOI: 10.1016/j.actbio.2010.09.018] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2010] [Revised: 09/10/2010] [Accepted: 09/15/2010] [Indexed: 11/18/2022]
Abstract
We developed a novel ultrasonically triggered drug vehicle with magnetic resonance (MR) properties by encapsulating superparamagnetic iron oxide (SPIO) nanoparticles in hydroxyapatite (HA)-coated liposomes. The effects of HA coating on the background leakage, ultrasound response and MR signal were investigated. HA coating of liposomes significantly reduced the background leakage of liposome. It also enhanced their sensitivity to ultrasound regardless of HA thickness or ultrasound frequency, even under sonication conditions of high frequency (1 and 3 MHz) and low power density (0.2-0.4 Wcm(-2)) used for diagnosis. However, it was found that the ultrasonically triggered vehicle could exhibit T(2) contrast in MR images by encapsulating SPIO. However, HA coating reduced the r(2) value of SPIO encapsulated in liposomes, but had no significant effect on the r(2)(∗) value, implying that MR images of HA-coated liposomes encapsulating SPIO could be probed by the T(2)(∗) signal. Most importantly, the r(2)(∗)-r(2) value of HA-coated liposomes encapsulating SPIO decreased after sonication, suggesting that the proposed vehicle could be used not only as a MR-guided drug vehicle capable of ultrasonically triggered release but also as a MR reporter to probe ultrasonic triggering.
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Affiliation(s)
- Tse-Ying Liu
- Institute of Biomedical Engineering, National Yang-Ming University, 155, Sec. 2, Lih-Nong Street, Taipei, Taiwan, ROC.
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36
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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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You JO, Almeda D, Ye GJC, Auguste DT. Bioresponsive matrices in drug delivery. J Biol Eng 2010; 4:15. [PMID: 21114841 PMCID: PMC3002303 DOI: 10.1186/1754-1611-4-15] [Citation(s) in RCA: 90] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2010] [Accepted: 11/29/2010] [Indexed: 02/10/2023] Open
Abstract
For years, the field of drug delivery has focused on (1) controlling the release of a therapeutic and (2) targeting the therapeutic to a specific cell type. These research endeavors have concentrated mainly on the development of new degradable polymers and molecule-labeled drug delivery vehicles. Recent interest in biomaterials that respond to their environment have opened new methods to trigger the release of drugs and localize the therapeutic within a particular site. These novel biomaterials, usually termed "smart" or "intelligent", are able to deliver a therapeutic agent based on either environmental cues or a remote stimulus. Stimuli-responsive materials could potentially elicit a therapeutically effective dose without adverse side effects. Polymers responding to different stimuli, such as pH, light, temperature, ultrasound, magnetism, or biomolecules have been investigated as potential drug delivery vehicles. This review describes the most recent advances in "smart" drug delivery systems that respond to one or multiple stimuli.
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Affiliation(s)
- Jin-Oh You
- School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138, USA
| | - Dariela Almeda
- School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138, USA
| | - George JC Ye
- School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138, USA
| | - Debra T Auguste
- School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138, USA
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Mandal AS, Biswas N, Karim KM, Guha A, Chatterjee S, Behera M, Kuotsu K. Drug delivery system based on chronobiology—A review. J Control Release 2010; 147:314-25. [DOI: 10.1016/j.jconrel.2010.07.122] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2010] [Accepted: 07/28/2010] [Indexed: 11/29/2022]
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Chen X, Chen S, Wang J. A pH-responsive poly(N-isopropylacrylamide-co-acrylic acid) hydrogel for the selective isolation of hemoglobin from human blood. Analyst 2010; 135:1736-41. [PMID: 20480063 DOI: 10.1039/c000465k] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A pH-responsive poly(N-isopropylacrylamide-co-acrylic acid) hydrogel was prepared by an aqueous dispersion polymerization process. The number of carboxylic groups distributed on the surface of the hydrogel was found to be 1.89 mmol g(-1). The hydrogel exhibits excellent binding selectivity to the protein species of interest within certain pH regions. In the present work, it was applied to the selective isolation of hemoglobin from human whole blood. Some important experimental parameters governing the sorption property, including the pH of sample solution, the ionic strength and sorption time, were investigated. Using 2.0 mg of the hydrogel as a sorption medium and suitable acidity of pH 6.0, a sorption efficiency of 93% was achieved for 200 microg mL(-1) of hemoglobin in 1.0 mL of sample solution. Afterwards, the absorbed hemoglobin could be readily recovered using 1.0 mL of Tris-HCl buffer (pH 8.6, 0.01 mol L(-1)), giving rise to recovery of ca. 76%. The practical applicability of this system was further demonstrated by processing human whole blood for the isolation of hemoglobin, and satisfactory results were obtained by assay with SDS-PAGE.
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Affiliation(s)
- Xuwei Chen
- Research Center for Analytical Sciences, Northeastern University, Box 332, Shenyang, 110819, China
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McCoy CP, Brady C, Cowley JF, McGlinchey SM, McGoldrick N, Kinnear DJ, Andrews GP, Jones DS. Triggered drug delivery from biomaterials. Expert Opin Drug Deliv 2010; 7:605-16. [PMID: 20205603 DOI: 10.1517/17425241003677731] [Citation(s) in RCA: 63] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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41
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Depan D, Saikia L, Singh RP. Ultrasound-Triggered Release of Ibuprofen from a Chitosan-Mesoporous Silica Composite- a Novel Approach for Controlled Drug Release. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/masy.201050111] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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42
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Husseini GA, Mjalli FS, Pitt WG, Abdel-Jabbar NM. Using Artificial Neural Networks and Model Predictive Control to Optimize Acoustically Assisted Doxorubicin Release from Polymeric Micelles. Technol Cancer Res Treat 2009; 8:479-88. [DOI: 10.1177/153303460900800609] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
We have been developing a drug delivery system that uses Pluronic P105 micelles to sequester a chemotherapeutic drug - namely, Doxorubicin (Dox) - until it reaches the cancer site. Ultrasound is then applied to release the drug directly to the tumor and in the process minimize the adverse side effects of chemotherapy on non-tumor tissues. Here, we present an artificial neural network (ANN) model that attempts to model the dynamic release of Dox from P105 micelles under different ultrasonic power intensities at two frequencies. The developed ANN model is then utilized to optimize the ultrasound application to achieve a target drug release at the tumor site via an ANN-based model predictive control. The parameters of the controller are then tuned to achieve good reference signal tracking. We were successful in designing and testing a controller capable of adjusting the ultrasound frequency, intensity, and pulse length to sustain constant Dox release.
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Affiliation(s)
- Ghaleb A. Husseini
- Chemical Engineering Department, American University of Sharjah, Sharjah, United Arab Emirates
- Department of Chemical Engineering, Brigham Young University, Provo, Utah USA 84602
| | - Farouq S. Mjalli
- Chemical Engineering Department, University of Malaya, Kuala Lumpur, Malaysia
| | - William G. Pitt
- Department of Chemical Engineering, Brigham Young University, Provo, Utah USA 84602
| | - Nabil M. Abdel-Jabbar
- Chemical Engineering Department, American University of Sharjah, Sharjah, United Arab Emirates
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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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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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McCarney ER, Armstrong BD, Kausik R, Han S. Dynamic nuclear polarization enhanced nuclear magnetic resonance and electron spin resonance studies of hydration and local water dynamics in micelle and vesicle assemblies. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2008; 24:10062-10072. [PMID: 18700788 DOI: 10.1021/la800334k] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
We present a unique analysis tool for the selective detection of local water inside soft molecular assemblies (hydrophobic cores, vesicular bilayers, and micellar structures) suspended in bulk water. Through the use of dynamic nuclear polarization (DNP), the (1)H NMR signal of water is amplified, as it interacts with stable radicals that possess approximately 658 times higher spin polarization. We utilized stable nitroxide radicals covalently attached along the hydrophobic tail of stearic acid molecules that incorporate themselves into surfactant-based micelle or vesicle structures. Here, we present a study of local water content and fluid viscosity inside oleate micelles and vesicles and Triton X-100 micelles to serve as model systems for soft molecular assemblies. This approach is unique because the amplification of the NMR signal is performed in bulk solution and under ambient conditions with site-specific spin labels that only detect the water that is directly interacting with the localized spin labels. Continuous wave (cw) electron spin resonance (ESR) analysis provides rotational dynamics of the spin-labeled molecular chain segments and local polarity parameters that can be related to hydration properties, whereas we show that DNP-enhanced (1)H NMR analysis of fluid samples directly provides translational water dynamics and permeability of the local environment probed by the spin label. Our technique therefore has the potential to become a powerful analysis tool, complementary to cw ESR, to study hydration characteristics of surfactant assemblies, lipid bilayers, or protein aggregates, where water dynamics is a key parameter of their structure and function. In this study, we find that there is significant penetration of water inside the oleate micelles with a higher average local water viscosity (approximately 1.8 cP) than in bulk water, and Triton X-100 micelles and oleate vesicle bilayers mostly exclude water while allowing for considerable surfactant chain motion and measurable water permeation through the soft structure.
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Affiliation(s)
- Evan R McCarney
- Department of Chemistry and Biochemistry, University of California-Santa Barbara, CA 93106, USA
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Heinz P, Brétagnol F, Mannelli I, Sirghi L, Valsesia A, Ceccone G, Gilliland D, Landfester K, Rauscher H, Rossi F. Poly(N-isopropylacrylamide) grafted on plasma-activated poly(ethylene oxide): thermal response and interaction with proteins. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2008; 24:6166-6175. [PMID: 18484752 DOI: 10.1021/la800575f] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Thermoresponsive polymer layers offer the possibility of preparing smart surfaces with properties that are switchable through a phase transition, usually close to the lower critical solution temperature of the polymer. In particular, poly( N-isopropylacrylamide) (pNIPAM) has gained a great deal of attention because it has such a phase transition in a physiologically interesting temperature range. We have prepared ultrathin thermoresponsive coatings by grafting pNIPAM on a plasma-CVD-deposited, poly(ethylene oxide)-like polymer substrate that was activated in an Ar plasma discharge to initiate the grafting. The presence and integrity of pNIPAM was verified by XPS and ToF-SIMS, and a dramatic change in the wettability during the phase transition was identified by temperature-dependent contact angle measurements. The transition from the hydrated to the collapsed conformation was analyzed by temperature-dependent QCM measurements and by AFM. An unusual, reversible behavior of the viscoelastic properties was seen directly at the phase transition from the swollen to the collapsed state. The phase transition leads to a switching from protein repulsion to a state that allows the adsorption of proteins.
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Affiliation(s)
- P Heinz
- Institute for Health and Consumer Protection, Directorate General Joint Research Centre, European Commission, Via E. Fermi, 21027 Ispra (VA), Italy
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Maharjan P, Woonton BW, Bennett LE, Smithers GW, DeSilva K, Hearn MT. Novel chromatographic separation — The potential of smart polymers. INNOV FOOD SCI EMERG 2008. [DOI: 10.1016/j.ifset.2007.03.028] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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48
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Paliwal S, Mitragotri S. Ultrasound-induced cavitation: applications in drug and gene delivery. Expert Opin Drug Deliv 2006; 3:713-26. [PMID: 17076594 DOI: 10.1517/17425247.3.6.713] [Citation(s) in RCA: 69] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Ultrasound, which has been conventionally used for diagnostics until recently, is now being extensively used for drug and gene delivery. This transformation has come about primarily due to ultrasound-mediated acoustic cavitation - particularly transient cavitation. Acoustic cavitation has been used to facilitate the delivery of small molecules, as well as macromolecules, including proteins and DNA. Controlled generation of cavitation has also been used for targeting drugs to diseased tissues, including skin, brain, eyes and endothelium. Ultrasound has also been employed for the treatment of several diseases, including thromboembolism, arteriosclerosis and cancer. This review provides a detailed account of mechanisms, current status and future prospects of ultrasonic cavitation in drug and gene delivery applications.
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Affiliation(s)
- Sumit Paliwal
- University of California, Department of Chemical Engineering, Santa Barbara, CA 93106, USA.
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Bartold PM, Xiao Y, Lyngstaadas SP, Paine ML, Snead ML. Principles and applications of cell delivery systems for periodontal regeneration. Periodontol 2000 2006; 41:123-35. [PMID: 16686930 DOI: 10.1111/j.1600-0757.2006.00156.x] [Citation(s) in RCA: 77] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- P Mark Bartold
- Colgate Australian Clinical Dental Research Centre, Dental School, University of Adelaide, Adelaide, South Australia, Australia
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50
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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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