151
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Masuda T, Akimoto AM, Nagase K, Okano T, Yoshida R. Artificial cilia as autonomous nanoactuators: Design of a gradient self-oscillating polymer brush with controlled unidirectional motion. Sci Adv 2016; 2:e1600902. [PMID: 27602405 PMCID: PMC5007072 DOI: 10.1126/sciadv.1600902] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/26/2016] [Accepted: 08/05/2016] [Indexed: 05/31/2023]
Abstract
A gradient self-oscillating polymer brush surface with ordered, autonomous, and unidirectional ciliary motion has been designed. The self-oscillating polymer is a random copolymer composed of N-isopropylacrylamide and ruthenium tris(2,2'-bipyridine) [Ru(bpy)3], which acts as a catalyst for an oscillating chemical reaction, the Belousov-Zhabotinsky reaction. The target polymer brush surface was designed to have a thickness gradient by using sacrificial-anode atom transfer radical polymerization. The gradient structure of the polymer brush was confirmed by x-ray photoelectron spectroscopy, atomic force microscopy, and ultraviolet-visible spectroscopy. These analyses revealed that the thickness of the polymer brush was in the range of several tens of nanometers, and the amount of Ru(bpy)3 increased as the thickness increased. The gradient polymer brush induced a unidirectional propagation of the chemical wave from the region with small Ru(bpy)3 amounts to the region with large Ru(bpy)3 amounts. This spatiotemporal control of the ciliary motion would be useful in potential applications to functional surface such as autonomous mass transport systems.
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Affiliation(s)
- Tsukuru Masuda
- Department of Materials Engineering, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Aya Mizutani Akimoto
- Department of Materials Engineering, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Kenichi Nagase
- Institute of Advanced Biomedical Engineering and Science, Tokyo Women’s Medical University (TWIns), 8-1 Kawada-cho, Shinjuku-ku, Tokyo 162-8666, Japan
| | - Teruo Okano
- Institute of Advanced Biomedical Engineering and Science, Tokyo Women’s Medical University (TWIns), 8-1 Kawada-cho, Shinjuku-ku, Tokyo 162-8666, Japan
| | - Ryo Yoshida
- Department of Materials Engineering, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
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152
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Finetti C, Sola L, Pezzullo M, Prosperi D, Colombo M, Riva B, Avvakumova S, Morasso C, Picciolini S, Chiari M. Click Chemistry Immobilization of Antibodies on Polymer Coated Gold Nanoparticles. Langmuir 2016; 32:7435-7441. [PMID: 27367748 DOI: 10.1021/acs.langmuir.6b01142] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The goal of this work is to develop an innovative approach for the coating of gold nanoparticles (AuNPs) with a synthetic functional copolymer. This stable coating with a thickness of few nanometers provides, at the same time, stabilization and functionalization of the particles. The polymeric coating consists of a backbone of polydimethylacrylamide (DMA) functionalized with an alkyne monomer that allows the binding of azido modified molecules by Cu(I)-catalyzed azide/alkyne 1,3-dipolar cycloaddition (CuAAC, click chemistry). The thin polymer layer on the surface stabilizes the colloidal suspension whereas the alkyne functions pending from the backbone are available for the reaction with azido-modified proteins. The reactivity of the coating is demonstrated by immobilizing an azido modified anti-mouse IgG antibody on the particle surface. This approach for the covalent binding of antibody to a gold-NPs is applied to the development of gold labels in biosensing techniques.
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Affiliation(s)
- Chiara Finetti
- Istituto di Chimica del Riconoscimento Molecolare, CNR , Via Mario Bianco 9, 20131 Milano, Italy
- Dipartimento di Scienze Farmaceutiche, Università degli Studi di Milano , Via Mangiagalli 25, 20133 Milano, Italy
| | - Laura Sola
- Istituto di Chimica del Riconoscimento Molecolare, CNR , Via Mario Bianco 9, 20131 Milano, Italy
| | | | - Davide Prosperi
- NanobioLab, Dipartimento di Biotecnologie e Bioscienze, Università degli Studi di Milano-Bicocca , Piazza della Scienza 2, 20126 Milano, Italy
| | - Miriam Colombo
- NanobioLab, Dipartimento di Biotecnologie e Bioscienze, Università degli Studi di Milano-Bicocca , Piazza della Scienza 2, 20126 Milano, Italy
| | - Benedetta Riva
- NanobioLab, Dipartimento di Biotecnologie e Bioscienze, Università degli Studi di Milano-Bicocca , Piazza della Scienza 2, 20126 Milano, Italy
| | - Svetlana Avvakumova
- NanobioLab, Dipartimento di Biotecnologie e Bioscienze, Università degli Studi di Milano-Bicocca , Piazza della Scienza 2, 20126 Milano, Italy
| | - Carlo Morasso
- Laboratory of Nanomedicine and Clinical Biophotonics, Centre for Innovation and Technology Transfer, Fondazione Don Carlo Gnocchi ONLUS , 20121 Milano, Italy
| | - Silvia Picciolini
- Laboratory of Nanomedicine and Clinical Biophotonics, Centre for Innovation and Technology Transfer, Fondazione Don Carlo Gnocchi ONLUS , 20121 Milano, Italy
| | - Marcella Chiari
- Istituto di Chimica del Riconoscimento Molecolare, CNR , Via Mario Bianco 9, 20131 Milano, Italy
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153
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Zhang Y, Zhang J, Chen M, Gong H, Thamphiwatana S, Eckmann L, Gao W, Zhang L. A Bioadhesive Nanoparticle-Hydrogel Hybrid System for Localized Antimicrobial Drug Delivery. ACS Appl Mater Interfaces 2016; 8:18367-74. [PMID: 27352845 PMCID: PMC4983189 DOI: 10.1021/acsami.6b04858] [Citation(s) in RCA: 70] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Effective antibacterial treatment at the infection site associated with high shear forces remains challenging, owing largely to the lack of durably adhesive and safe delivery platforms that can enable localized antibiotic accumulation against bacterial colonization. Inspired by delivery systems mimicking marine mussels for adhesion, herein, we developed a bioadhesive nanoparticle-hydrogel hybrid (NP-gel) to enhance localized antimicrobial drug delivery. Antibiotics were loaded into polymeric nanoparticles and then embedded into a 3D hydrogel network that confers adhesion to biological surfaces. The combination of two distinct delivery platforms, namely, nanoparticles and hydrogel, allows the hydrogel network properties to be independently tailored for adhesion while maintaining controlled and prolonged antibiotic release profile from the nanoparticles. The bioadhesive NP-gel developed here showed superior adhesion and antibiotic retention under high shear stress on a bacterial film, a mammalian cell monolayer, and mouse skin tissue. Under a flow environment, the NP-gel inhibited the formation of an Escherichia coli bacterial film. When applied on mouse skin tissue for 7 consecutive days, the NP-gel did not generate any observable skin reaction or toxicity, implying its potential as a safe and effective local delivery platform against microbial infections.
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Affiliation(s)
- Yue Zhang
- Department of NanoEngineering, University of California, San Diego, La Jolla, CA 92093, USA
- Moores Cancer Center, University of California, San Diego, La Jolla, CA 92093, USA
| | - Jianhua Zhang
- Department of NanoEngineering, University of California, San Diego, La Jolla, CA 92093, USA
- Department of Polymer Science and Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, China
| | - Maggie Chen
- Department of NanoEngineering, University of California, San Diego, La Jolla, CA 92093, USA
| | - Hua Gong
- Department of NanoEngineering, University of California, San Diego, La Jolla, CA 92093, USA
- Institute of Functional Nano & Soft Materials (FUNSOM), Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou, Jiangsu, 215123, China
| | - Soracha Thamphiwatana
- Department of NanoEngineering, University of California, San Diego, La Jolla, CA 92093, USA
- Moores Cancer Center, University of California, San Diego, La Jolla, CA 92093, USA
| | - Lars Eckmann
- Department of Medicine, University of California, San Diego, La Jolla, CA 92093, USA
| | - Weiwei Gao
- Department of NanoEngineering, University of California, San Diego, La Jolla, CA 92093, USA
- Moores Cancer Center, University of California, San Diego, La Jolla, CA 92093, USA
| | - Liangfang Zhang
- Department of NanoEngineering, University of California, San Diego, La Jolla, CA 92093, USA
- Moores Cancer Center, University of California, San Diego, La Jolla, CA 92093, USA
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154
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Abstract
We report the design of hydrogels that can act as "smart" valves or membranes. Each hydrogel is engineered with a pore (about 1 cm long and <1 mm thick) that remains closed under ambient conditions but opens under specific conditions. Our design is inspired by the stomatal valves in plant leaves, which regulate the movement of water and gases in and out of the leaves. The design features two different gels, active and passive, which are attached concentrically to form a disc-shaped hybrid film. The pore is created in the central active gel, and the conditions for opening the pore can be tuned based on the chemistry of this gel. For example, if the active gel is made from N-isopropylacrylamide (NIPA), the actuation of the pore depends on the temperature of water relative to 32 °C, which is the lower-critical solution temperature (LCST) of NIPA. The concentric design of our hybrid provides directionality to the volumetric transition of the active gel, i.e., it ensures that the pore opens as the active gel shrinks. In turn, contact with hot water (T > 32 °C) opens the pore and allows the water to pass through the gel. Conversely, the pore remains closed when the water is cold (T < 32 °C). The gel thereby acts as a "smart" valve that is able to regulate the flow of solvent depending on its properties. We have extended the concept to other stimuli that can cause gel-swelling transitions including solvent composition, pH, and light. Additionally, when two different gel-based valves are arranged in series, the assembly acts as a logical "AND" gate, i.e., water flows through the valve-combination only if it simultaneously satisfies two distinct conditions (such as its pH being below a critical value and its temperature being above a critical value).
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Affiliation(s)
- Ankit Gargava
- Department of Chemical and Biomolecular Engineering, University of Maryland , College Park, Maryland 20742-2111, United States
| | - Chandamany Arya
- Department of Chemical and Biomolecular Engineering, University of Maryland , College Park, Maryland 20742-2111, United States
| | - Srinivasa R Raghavan
- Department of Chemical and Biomolecular Engineering, University of Maryland , College Park, Maryland 20742-2111, United States
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155
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Hadler C, Aliuos P, Brandes G, Warnecke A, Bohlmann J, Dempwolf W, Menzel H, Lenarz T, Reuter G, Wissel K. Polymer Coatings of Cochlear Implant Electrode Surface - An Option for Improving Electrode-Nerve-Interface by Blocking Fibroblast Overgrowth. PLoS One 2016; 11:e0157710. [PMID: 27391483 PMCID: PMC4938590 DOI: 10.1371/journal.pone.0157710] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2016] [Accepted: 05/03/2016] [Indexed: 11/18/2022] Open
Abstract
Overgrowth of connective tissue and scar formation induced by the electrode array insertion increase the impedance and, thus, diminish the interactions between neural probes as like cochlear implants (CI) and the target tissue. Therefore, it is of great clinical interest to modify the carrier material of the electrodes to improve the electrode nerve interface for selective cell adhesion. On one side connective tissue growth needs to be reduced to avoid electrode array encapsulation, on the other side the carrier material should not compromise the interaction with neuronal cells. The present in vitro-study qualitatively and quantitatively characterises the interaction of fibroblasts, glial cells and spiral ganglion neurons (SGN) with ultrathin poly(N,N-dimethylacrylamide) (PDMAA), poly(2-ethyloxazoline) (PEtOx) and poly([2-methacryloyloxy)ethyl]trimethylammoniumchlorid) (PMTA) films immobilised onto glass surfaces using a photoreactive anchor layer. The layer thickness and hydrophilicity of the polymer films were characterised by ellipsometric and water contact angle measurement. Moreover the topography of the surfaces was investigated using atomic force microscopy (AFM). The neuronal and non-neuronal cells were dissociated from spiral ganglions of postnatal rats and cultivated for 48 h on top of the polymer coatings. Immunocytochemical staining of neuronal and intermediary filaments revealed that glial cells predominantly attached on PMTA films, but not on PDMAA and PEtOx monolayers. Hereby, strong survival rates and neurite outgrowth were only found on PMTA, whereas PDMAA and PEtOx coatings significantly reduced the SG neuron survival and neuritogenesis. As also shown by scanning electron microscopy (SEM) SGN strongly survived and retained their differentiated phenotype only on PMTA. In conclusion, survival and neuritogenesis of SGN may be associated with the extent of the glial cell growth. Since PMTA was the only of the polar polymers used in this study bearing a cationic charge, it can be assumed that this charge favours adhesion of both glial cells and SG neurons glial cells and SGN.
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Affiliation(s)
- C. Hadler
- Institute for Technical Chemistry, University of Technology Braunschweig, Braunschweig, Germany
| | - P. Aliuos
- Department of Otorhinolaryngology, Hannover Medical School, Hannover, Germany
- Cluster of Excellence “Hearing 4 All”, Hannover, Germany
| | - G. Brandes
- Institute of Cell Biology, Center of Anatomy, Hannover Medical School, Hannover, Germany
| | - A. Warnecke
- Department of Otorhinolaryngology, Hannover Medical School, Hannover, Germany
- Cluster of Excellence “Hearing 4 All”, Hannover, Germany
| | - J. Bohlmann
- Department of Otorhinolaryngology, Hannover Medical School, Hannover, Germany
| | - W. Dempwolf
- Institute for Technical Chemistry, University of Technology Braunschweig, Braunschweig, Germany
| | - H. Menzel
- Institute for Technical Chemistry, University of Technology Braunschweig, Braunschweig, Germany
| | - T. Lenarz
- Department of Otorhinolaryngology, Hannover Medical School, Hannover, Germany
- Cluster of Excellence “Hearing 4 All”, Hannover, Germany
| | - G. Reuter
- Department of Otorhinolaryngology, Hannover Medical School, Hannover, Germany
| | - K. Wissel
- Department of Otorhinolaryngology, Hannover Medical School, Hannover, Germany
- * E-mail:
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156
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Chen L, Xie Z, Gan T, Wang Y, Zhang G, Mirkin CA, Zheng Z. Biomimicking Nano-Micro Binary Polymer Brushes for Smart Cell Orientation and Adhesion Control. Small 2016; 12:3400-6. [PMID: 27184011 DOI: 10.1002/smll.201600634] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/25/2016] [Revised: 04/09/2016] [Indexed: 05/04/2023]
Abstract
A new biomimetic surface named nano-micro binary polymer brushes is fabricated by large-area bench-top dip-pen nanodisplacement lithography technique. It is composed of gelatin-modified poly(glycidyl methacrylate) nanolines which are spaced by microstripes of poly(N-isopropylacrylamide). Cells are not only adhered and oriented well on the re-used surface, but also detachable from the surface with well-preserved extracellular matrix and aligned morphology.
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Affiliation(s)
- Lina Chen
- Nanotechnology Centre, Institute of Textiles and Clothing, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, SAR, China
| | - Zhuang Xie
- Nanotechnology Centre, Institute of Textiles and Clothing, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, SAR, China
- Department of Chemistry and International Institute for Nanotechnology, Northwestern University, 2145 Sheridan Road, Evanston, IL, 60208, USA
| | - Tiansheng Gan
- Faculty of Materials Science and Engineering, South China University of Technology, Guangzhou, 510640, China
| | - Yi Wang
- Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, SAR, China
| | - Guangzhao Zhang
- Faculty of Materials Science and Engineering, South China University of Technology, Guangzhou, 510640, China
| | - Chad A Mirkin
- Department of Chemistry and International Institute for Nanotechnology, Northwestern University, 2145 Sheridan Road, Evanston, IL, 60208, USA
| | - Zijian Zheng
- Nanotechnology Centre, Institute of Textiles and Clothing, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, SAR, China
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157
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Chen J, Lin L, Guo Z, Xu C, Li Y, Tian H, Tang Z, He C, Chen X. N-Isopropylacrylamide Modified Polyethylenimines as Effective siRNA Carriers for Cancer Therapy. J Nanosci Nanotechnol 2016; 16:5464-5469. [PMID: 27427585 DOI: 10.1166/jnn.2016.11732] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
N-isopropylacrylamide modified PEI (PEN) was synthesized via Michael addition and was developed as an efficient siRNA delivery system both in vitro and in vivo. PEN showed significant enhanced cytocompatibility compared with commercial PEI-25k. The complexation of PEN with siRNA was studied by gel retardation, particle size and zeta potential measurement. The in vitro transfection ability of PEN was measured by qRT-PCR assay, and achieved obviously enhanced gene silencing efficiency compared with PEI-25k. The confocal imaging and flow cytometric analysis further validated its excellent intracellular trafficking ability. For antitumor treatment experiment, PEN mediated siVEGF showed obviously therapeutic effects for the treatment of CT26 tumor. Therefore, the present study demonstrated a useful strategy for constructing efficient siRNA delivery vehicles for antitumor therapy.
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158
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Hartanto Y, Zargar M, Wang H, Jin B, Dai S. Thermoresponsive Acidic Microgels as Functional Draw Agents for Forward Osmosis Desalination. Environ Sci Technol 2016; 50:4221-4228. [PMID: 27055090 DOI: 10.1021/acs.est.5b04123] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Thermoresponsive microgels with carboxylic acid functionalization have been recently introduced as an attractive draw agent for forward osmosis (FO) desalination, where the microgels showed promising water flux and water recovery performance. In this study, various comonomers containing different carboxylic acid and sulfonic acid functional groups were copolymerized with N-isopropylacrylamide (NP) to yield a series of functionalized thermoresponsive microgels possessing different acidic groups and hydrophobicities. The purified microgels were examined as the draw agents for FO application, and the results show the response of water flux and water recovery was significantly affected by various acidic comonomers. The thermoresponsive microgel with itaconic acid shows the best overall performance with an initial water flux of 44.8 LMH, water recovery up to 47.2% and apparent water flux of 3.1 LMH. This study shows that the incorporation of hydrophilic dicarboxylic acid functional groups into the microgels leads to the enhancement on water adsorption and overall performance. Our work elucidates in detail on the structure-property relationship of thermoresponsive microgels in their applications as FO draw agents and would be beneficial for future design and development of high performance FO desalination.
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Affiliation(s)
- Yusak Hartanto
- School of Chemical Engineering, The University of Adelaide , Adelaide, South Australia 5005, Australia
| | - Masoumeh Zargar
- School of Chemical Engineering, The University of Adelaide , Adelaide, South Australia 5005, Australia
| | - Haihui Wang
- School of Chemistry & Chemical Engineering, South China University of Technology , Guangzhou 510640, People's Republic of China
| | - Bo Jin
- School of Chemical Engineering, The University of Adelaide , Adelaide, South Australia 5005, Australia
| | - Sheng Dai
- School of Chemical Engineering, The University of Adelaide , Adelaide, South Australia 5005, Australia
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159
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Hackler L, Ózsvári B, Gyuris M, Sipos P, Fábián G, Molnár E, Marton A, Faragó N, Mihály J, Nagy LI, Szénási T, Diron A, Párducz Á, Kanizsai I, Puskás LG. The Curcumin Analog C-150, Influencing NF-κB, UPR and Akt/Notch Pathways Has Potent Anticancer Activity In Vitro and In Vivo. PLoS One 2016; 11:e0149832. [PMID: 26943907 PMCID: PMC4778904 DOI: 10.1371/journal.pone.0149832] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2014] [Accepted: 02/05/2016] [Indexed: 12/21/2022] Open
Abstract
C-150 a Mannich-type curcumin derivative, exhibited pronounced cytotoxic effects against eight glioma cell lines at micromolar concentrations. Inhibition of cell proliferation by C-150 was mediated by affecting multiple targets as confirmed at transcription and protein level. C-150 effectively reduced the transcription activation of NFkB, inhibited PKC-alpha which are constitutively over-expressed in glioblastoma. The effects of C-150 on the Akt/ Notch signaling were also demonstrated in a Drosophila tumorigenesis model. C-150 reduced the number of tumors in Drosophila with similar efficacy to mitoxantrone. In an in vivo orthotopic glioma model, C-150 significantly increased the median survival of treated nude rats compared to control animals. The multi-target action of C-150, and its preliminary in vivo efficacy would render this curcumin analogue as a potent clinical candidate against glioblastoma.
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Affiliation(s)
| | | | | | - Péter Sipos
- Department of Pharmaceutical Technology, University of Szeged, Szeged, Hungary
| | | | | | - Annamária Marton
- Institute of Biochemistry, Biological Research Center of the Hungarian Academy of Sciences, Szeged, Hungary
| | - Nóra Faragó
- AVIDIN Ltd., Szeged, Hungary
- Institute of Genetics, Biological Research Center of the Hungarian Academy of Sciences, Szeged, Hungary
| | - József Mihály
- Institute of Genetics, Biological Research Center of the Hungarian Academy of Sciences, Szeged, Hungary
| | | | - Tibor Szénási
- Institute of Genetics, Biological Research Center of the Hungarian Academy of Sciences, Szeged, Hungary
| | | | - Árpád Párducz
- Institute of Biophysics, Biological Research Center of the Hungarian Academy of Sciences, Szeged, Hungary
| | | | - László G. Puskás
- AVIDIN Ltd., Szeged, Hungary
- Institute of Genetics, Biological Research Center of the Hungarian Academy of Sciences, Szeged, Hungary
- * E-mail:
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160
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Fujita M, Hiramine H, Pan P, Hikima T, Maeda M. Effects of Complementary DNA and Salt on the Thermoresponsiveness of Poly(N-isopropylacrylamide)-b-DNA. Langmuir 2016; 32:1148-1154. [PMID: 26750407 DOI: 10.1021/acs.langmuir.5b04141] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The thermoresponsive structural transition of poly(N-isopropylacrylamide) (PNIPAAm)-b-DNA copolymers was explored. Molecular assembly of the block copolymers was facilitated by adding salt, and this assembly was not nucleated by the association between DNA strands but by the coil-globule transition of PNIPAAm blocks. Below the lower critical solution temperature (LCST) of PNIPAAm, the copolymer solution remained transparent even at high salt concentrations, regardless of whether DNA was hybridized with its complementary partner to form a double-strand (or single-strand) structure. At the LCST, the hybridized copolymer assembled in spherical nanoparticles, surrounded by double-stranded DNA; subsequently, the non-cross-linking aggregation occurred, while the nanoparticles were dispersed if the salt concentration was low or DNA blocks were unhybridized. When the DNA duplex was denatured to a single-stranded state by heating, the aggregated nanoparticles redispersed owing to the recovery of the steric repulsion of the DNA strands. The changes in the steric and electrostatic effects by hybridization and the addition of salt did not result in any specific attraction between DNA strands but merely decreased the repulsive interactions. The van der Waals attraction between the nanoparticles overcame such repulsive interactions so that the non-cross-linking aggregation of the micellar particles was mediated.
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Affiliation(s)
- Masahiro Fujita
- Bioengineering Laboratory, RIKEN, Hirosawa 2-1, Wako-shi, Saitama 351-0198, Japan
| | - Hayato Hiramine
- Department of Advanced Materials Science, School of Frontier Science, The University of Tokyo , Kashiwanoha 5-1-5, Kashiwa-shi, Chiba 277-8561, Japan
| | - Pengju Pan
- Bioengineering Laboratory, RIKEN, Hirosawa 2-1, Wako-shi, Saitama 351-0198, Japan
| | - Takaaki Hikima
- RIKEN SPring-8 Center, Advanced Photon Technology Division, Kouto 1-1-1, Sayo-cho, Sayo-gun, Hyogo 679-5148, Japan
| | - Mizuo Maeda
- Bioengineering Laboratory, RIKEN, Hirosawa 2-1, Wako-shi, Saitama 351-0198, Japan
- Department of Advanced Materials Science, School of Frontier Science, The University of Tokyo , Kashiwanoha 5-1-5, Kashiwa-shi, Chiba 277-8561, Japan
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161
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Crochiere ML, Baloglu E, Klebanov B, Donovan S, del Alamo D, Lee M, Kauffman M, Shacham S, Landesman Y. A method for quantification of exportin-1 (XPO1) occupancy by Selective Inhibitor of Nuclear Export (SINE) compounds. Oncotarget 2016; 7:1863-77. [PMID: 26654943 PMCID: PMC4811503 DOI: 10.18632/oncotarget.6495] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2015] [Accepted: 11/18/2015] [Indexed: 12/13/2022] Open
Abstract
Selective Inhibitor of Nuclear Export (SINE) compounds are a family of small-molecules that inhibit nuclear export through covalent binding to cysteine 528 (Cys528) in the cargo-binding pocket of Exportin 1 (XPO1/CRM1) and promote cancer cell death. Selinexor is the lead SINE compound currently in phase I and II clinical trials for advanced solid and hematological malignancies. In an effort to understand selinexor-XPO1 interaction and to establish whether cancer cell response is a function of drug-target engagement, we developed a quantitative XPO1 occupancy assay. Biotinylated leptomycin B (b-LMB) was utilized as a tool compound to measure SINE-free XPO1. Binding to XPO1 was quantitated from SINE compound treated adherent and suspension cells in vitro, dosed ex vivo human peripheral blood mononuclear cells (PBMCs), and PBMCs from mice dosed orally with drug in vivo. Evaluation of a panel of selinexor sensitive and resistant cell lines revealed that resistance was not attributed to XPO1 occupancy by selinexor. Administration of a single dose of selinexor bound XPO1 for minimally 72 hours both in vitro and in vivo. While XPO1 inhibition directly correlates with selinexor pharmacokinetics, the biological outcome of this inhibition depends on modulation of pathways downstream of XPO1, which ultimately determines cancer cell responsiveness.
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MESH Headings
- Acrylamides/chemistry
- Acrylamides/pharmacology
- Acrylates/chemistry
- Acrylates/pharmacology
- Active Transport, Cell Nucleus/drug effects
- Animals
- Antibiotics, Antineoplastic/chemistry
- Antibiotics, Antineoplastic/pharmacokinetics
- Antibiotics, Antineoplastic/pharmacology
- Biotinylation
- Cell Line, Tumor
- Cell Nucleus/drug effects
- Cell Nucleus/metabolism
- Cell Survival/drug effects
- Cells, Cultured
- Drug Evaluation, Preclinical/methods
- Fatty Acids, Unsaturated/chemistry
- Fatty Acids, Unsaturated/pharmacokinetics
- Fatty Acids, Unsaturated/pharmacology
- HCT116 Cells
- Humans
- Hydrazines/chemistry
- Hydrazines/pharmacokinetics
- Hydrazines/pharmacology
- Karyopherins/metabolism
- Leukocytes, Mononuclear/cytology
- Leukocytes, Mononuclear/drug effects
- Leukocytes, Mononuclear/metabolism
- Mice
- Molecular Structure
- Receptors, Cytoplasmic and Nuclear/metabolism
- Reproducibility of Results
- Thiazoles/chemistry
- Thiazoles/pharmacology
- Triazoles/chemistry
- Triazoles/pharmacokinetics
- Triazoles/pharmacology
- Exportin 1 Protein
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Affiliation(s)
- Marsha L. Crochiere
- All authors are current or former employees of Karyopharm Therapeutics Inc., Newton, MA, 02459 U.S.A
| | - Erkan Baloglu
- All authors are current or former employees of Karyopharm Therapeutics Inc., Newton, MA, 02459 U.S.A
| | - Boris Klebanov
- All authors are current or former employees of Karyopharm Therapeutics Inc., Newton, MA, 02459 U.S.A
| | - Scott Donovan
- All authors are current or former employees of Karyopharm Therapeutics Inc., Newton, MA, 02459 U.S.A
| | - Diego del Alamo
- All authors are current or former employees of Karyopharm Therapeutics Inc., Newton, MA, 02459 U.S.A
| | - Margaret Lee
- All authors are current or former employees of Karyopharm Therapeutics Inc., Newton, MA, 02459 U.S.A
| | - Michael Kauffman
- All authors are current or former employees of Karyopharm Therapeutics Inc., Newton, MA, 02459 U.S.A
| | - Sharon Shacham
- All authors are current or former employees of Karyopharm Therapeutics Inc., Newton, MA, 02459 U.S.A
| | - Yosef Landesman
- All authors are current or former employees of Karyopharm Therapeutics Inc., Newton, MA, 02459 U.S.A
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162
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Chu TW, Feng J, Yang J, Kopeček J. Hybrid polymeric hydrogels via peptide nucleic acid (PNA)/DNA complexation. J Control Release 2015; 220:608-16. [PMID: 26394062 PMCID: PMC4688099 DOI: 10.1016/j.jconrel.2015.09.035] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2015] [Revised: 09/10/2015] [Accepted: 09/18/2015] [Indexed: 11/24/2022]
Abstract
This work presents a new concept in hybrid hydrogel design. Synthetic water-soluble N-(2-hydroxypropyl)methacrylamide (HPMA) polymers grafted with multiple peptide nucleic acids (PNAs) are crosslinked upon addition of the linker DNA. The self-assembly is mediated by the PNA-DNA complexation, which results in the formation of hydrophilic polymer networks. We show that the hydrogels can be produced through two different types of complexations. Type I hydrogel is formed via the PNA/DNA double-helix hybridization. Type II hydrogel utilizes a unique "P-form" oligonucleotide triple-helix that comprises two PNA sequences and one DNA. Microrheology studies confirm the respective gelation processes and disclose a higher critical gelation concentration for the type I gel when compared to the type II design. Scanning electron microscopy reveals the interconnected microporous structure of both types of hydrogels. Type I double-helix hydrogel exhibits larger pore sizes than type II triple-helix gel. The latter apparently contains denser structure and displays greater elasticity as well. The designed hybrid hydrogels have potential as novel biomaterials for pharmaceutical and biomedical applications.
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Affiliation(s)
- Te-Wei Chu
- Department of Pharmaceutics and Pharmaceutical Chemistry, University of Utah, Salt Lake City, UT 84112, USA
| | - Jiayue Feng
- Department of Chemistry, University of Utah, Salt Lake City, UT 84112, USA
| | - Jiyuan Yang
- Department of Pharmaceutics and Pharmaceutical Chemistry, University of Utah, Salt Lake City, UT 84112, USA
| | - Jindřich Kopeček
- Department of Pharmaceutics and Pharmaceutical Chemistry, University of Utah, Salt Lake City, UT 84112, USA; Department of Bioengineering, University of Utah, Salt Lake City, UT 84112, USA.
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163
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de Sousa A, de Sousa EMB, de Sousa RG. Synthesis and Characterization of Poly(N-isopropylacrylamide)/SBA-15 Silica Nanocomposites. J Nanosci Nanotechnol 2015; 15:9438-9448. [PMID: 26682364 DOI: 10.1166/jnn.2015.10489] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The combination of the mesoporous silica material SBA-1 5 with the temperature-responsive hydrogels, such as poly(N-isopropylacrylamide) P(N-iPAAm) can lead to the formation of a material with the potential for application as a new drug delivery system, given that self-regulated delivery allows for drug release when needed. The present work studies the synthesis and characterization of hybrid systems consisting of the poly(N-isopropylacrylamide) hydrogel and SBA-15 by varying the amount of hydrogel within the silica network. A systematic study on the structural properties of hybrid samples, their thermal stability and the degradation of the polymer chains in silica was carried out through characterization techniques, including SAXS, thermogravimetry and physical adsorption of N2. The results were critically examined and compared with pure SBA-15. The present study's results demonstrated that the thermosensibility of P(N-iPAAm) was retained in the hybrid system, which presented a low critical solution temperature, similar to that of pure P(N-iPAAm). Moreover, the hydrogel did not fully occupy the available intrachannel space, making the [SBA-15/P(N-iPAAm)] hybrids a very promising candidate for hosting and further delivery, under appropriate conditions, of a variety of molecules of pharmaceutical interest.
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164
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Sigolaeva LV, Mergel O, Evtushenko EG, Gladyr SY, Gelissen APH, Pergushov DV, Kurochkin IN, Plamper FA, Richtering W. Engineering Systems with Spatially Separated Enzymes via Dual-Stimuli-Sensitive Properties of Microgels. Langmuir 2015; 31:13029-13039. [PMID: 26539639 DOI: 10.1021/acs.langmuir.5b03497] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
This work examines the adsorption regime and the properties of microgel/enzyme thin films deposited onto conductive graphite-based substrates. The films were formed via two-step sequential adsorption. A temperature- and pH-sensitive poly(N-isopropylacrylamide)-co-(3-(N,N-dimethylamino)propylmethacrylamide) microgel (poly(NIPAM-co-DMAPMA microgel) was adsorbed first, followed by its interaction with the enzymes, choline oxidase (ChO), butyrylcholinesterase (BChE), or mixtures thereof. By temperature-induced stimulating both (i) poly(NIPAM-co-DMAPMA) microgel adsorption at T > VPTT followed by short washing and drying and then (ii) enzyme loading at T < VPTT, we can effectively control the amount of the microgel adsorbed on a hydrophobic interface as well as the amount and the spatial localization of the enzyme interacted with the microgel film. Depending on the biomolecule size, enzyme molecules can (in the case for ChO) or cannot (in the case for BChE) penetrate into the microgel interior and be localized inside/outside the microgel particles. Different spatial localization, however, does not affect the specific enzymatic responses of ChO or BChE and does not prevent cascade enzymatic reaction involving both BChE and ChO as well. This was shown by the methods of electrochemical impedance spectroscopy (EIS), atomic force microscopy (AFM), and amperometric analysis of enzymatic responses of immobilized enzymes. Thus, a novel simple and fast strategy for physical entrapment of biomolecules by the polymeric matrix was proposed, which can be used for engineering systems with spatially separated enzymes of different types.
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Affiliation(s)
- Larisa V Sigolaeva
- Department of Chemistry, M.V. Lomonosov Moscow State University , 119991 Moscow, Russia
| | - Olga Mergel
- Institute of Physical Chemistry II, RWTH Aachen University , 52056 Aachen, Germany
| | - Evgeniy G Evtushenko
- Department of Chemistry, M.V. Lomonosov Moscow State University , 119991 Moscow, Russia
| | - Snezhana Yu Gladyr
- Department of Chemistry, M.V. Lomonosov Moscow State University , 119991 Moscow, Russia
| | - Arjan P H Gelissen
- Institute of Physical Chemistry II, RWTH Aachen University , 52056 Aachen, Germany
| | - Dmitry V Pergushov
- Department of Chemistry, M.V. Lomonosov Moscow State University , 119991 Moscow, Russia
| | - Ilya N Kurochkin
- Department of Chemistry, M.V. Lomonosov Moscow State University , 119991 Moscow, Russia
| | - Felix A Plamper
- Institute of Physical Chemistry II, RWTH Aachen University , 52056 Aachen, Germany
| | - Walter Richtering
- Institute of Physical Chemistry II, RWTH Aachen University , 52056 Aachen, Germany
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165
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Yang Z, Jia S, Zhuo N, Yang W, Wang Y. Flocculation of copper(II) and tetracycline from water using a novel pH- and temperature-responsive flocculants. Chemosphere 2015; 141:112-119. [PMID: 26162528 DOI: 10.1016/j.chemosphere.2015.06.050] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/02/2015] [Revised: 04/01/2015] [Accepted: 06/11/2015] [Indexed: 06/04/2023]
Abstract
Insufficient research is available on flocculation of combined pollutants of heavy metals and antibiotics, which widely exist in livestock wastewaters. Aiming at solving difficulties in flocculation of this sort of combined pollution, a novel pH- and temperature-responsive biomass-based flocculant, carboxymethyl chitosan-graft-poly(N-isoproyl acrylamide-co-diallyl dimethyl ammonium chloride) (denoted as CND) with two responsive switches [lower critical solution temperature (LCST) and isoelectric point (IEP)], was designed and synthesized. Its flocculation performance at different temperatures and pHs was evaluated using copper(II) and tetracycline (TC) as model contaminants. CND exhibited high efficiency for coremoval of both contaminants, whereas two commercial flocculants (polyaluminum chloride and polyacrylamide) did not. Especially, flocculation performance of the dual-responsive flocculant under conditions of temperature>LCST and IEP(contaminants)<pH<IEP(CND) was much better than that under other conditions. Further investigation on flocculation mechanism via pH monitoring, zeta potential measurements, floc properties analyses and spectral characterization indicated that, pairwise interactions among CND, copper(II) and TC were present in bridging flocculation, including charge attraction, coordination and hydrophobic effect. Based on these pairwise interactions, copper(II) and TC exerted "aid" roles to each other's removal with the existence of CND, and preferable flocculation performance was thus achieved.
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Affiliation(s)
- Zhen Yang
- School of Chemistry and Materials Science, Jiangsu Provincial Key Laboratory of Carbon and Nitrogen Cycle Processes and Pollution Control, Nanjing Normal University, Nanjing 210046, China
| | - Shuying Jia
- School of Chemistry and Materials Science, Jiangsu Provincial Key Laboratory of Carbon and Nitrogen Cycle Processes and Pollution Control, Nanjing Normal University, Nanjing 210046, China
| | - Ning Zhuo
- School of Chemistry and Materials Science, Jiangsu Provincial Key Laboratory of Carbon and Nitrogen Cycle Processes and Pollution Control, Nanjing Normal University, Nanjing 210046, China
| | - Weiben Yang
- School of Chemistry and Materials Science, Jiangsu Provincial Key Laboratory of Carbon and Nitrogen Cycle Processes and Pollution Control, Nanjing Normal University, Nanjing 210046, China.
| | - Yuping Wang
- School of Chemistry and Materials Science, Jiangsu Provincial Key Laboratory of Carbon and Nitrogen Cycle Processes and Pollution Control, Nanjing Normal University, Nanjing 210046, China
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166
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Guisasola E, Baeza A, Talelli M, Arcos D, Moros M, de la Fuente JM, Vallet-Regí M. Magnetic-Responsive Release Controlled by Hot Spot Effect. Langmuir 2015; 31:12777-82. [PMID: 26536300 DOI: 10.1021/acs.langmuir.5b03470] [Citation(s) in RCA: 66] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
Magnetically triggered drug delivery nanodevices have attracted great attention in nanomedicine, as they can feature as smart carriers releasing their payload at clinician's will. The key principle of these devices is based on the properties of magnetic cores to generate thermal energy in the presence of an alternating magnetic field. Then, the temperature increase triggers the drug release. Despite this potential, the rapid heat dissipation in living tissues is a serious hindrance for their clinical application. It is hypothesized that magnetic cores could act as hot spots, this is, produce enough heat to trigger the release without the necessity to increase the global temperature. Herein, a nanocarrier has been designed to respond when the temperature reaches 43 °C. This material has been able to release its payload under an alternating magnetic field without the need of increasing the global temperature of the environment, proving the efficacy of the hot spot mechanism in magnetic-responsive drug delivery devices.
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Affiliation(s)
- Eduardo Guisasola
- Departamento de Química Inorgánica y Bioinorgánica, UCM, Instituto de Investigación Sanitaria Hospital 12 de Octubre i+12, Centro de Investigación Biomédica en Red de Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN) , 28029 Madrid, Spain
| | - Alejandro Baeza
- Departamento de Química Inorgánica y Bioinorgánica, UCM, Instituto de Investigación Sanitaria Hospital 12 de Octubre i+12, Centro de Investigación Biomédica en Red de Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN) , 28029 Madrid, Spain
| | - Marina Talelli
- Departamento de Química Inorgánica y Bioinorgánica, UCM, Instituto de Investigación Sanitaria Hospital 12 de Octubre i+12, Centro de Investigación Biomédica en Red de Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN) , 28029 Madrid, Spain
| | - Daniel Arcos
- Departamento de Química Inorgánica y Bioinorgánica, UCM, Instituto de Investigación Sanitaria Hospital 12 de Octubre i+12, Centro de Investigación Biomédica en Red de Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN) , 28029 Madrid, Spain
| | - María Moros
- Instituto de Nanociencia de Aragon, Universidad de Zaragoza , C/Mariano Esquillor s/n, 50018 Zaragoza, Spain
- Istituto di Scienze Applicate e Sistemi Intelligenti "Eduardo Caianiello", Via Campi Flegrei 34, 80078 Pozzuoli (Naples), Italy
| | - Jesús M de la Fuente
- Instituto de Ciencia de Materiales de Aragón, CSIC-Universidad de Zaragoza , C/Pedro Cerbuna 12, 50018 Zaragoza, Spain
| | - María Vallet-Regí
- Departamento de Química Inorgánica y Bioinorgánica, UCM, Instituto de Investigación Sanitaria Hospital 12 de Octubre i+12, Centro de Investigación Biomédica en Red de Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN) , 28029 Madrid, Spain
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167
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Tavsanli B, Can V, Okay O. Mechanically strong triple network hydrogels based on hyaluronan and poly(N,N-dimethylacrylamide). Soft Matter 2015; 11:8517-8524. [PMID: 26376837 DOI: 10.1039/c5sm01941a] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Hyaluronan (HA) is a natural polyelectrolyte with distinctive biological functions. Cross-linking of HA to generate less degradable hydrogels for use in biomedical applications has attracted interest over many years. One limitation of HA hydrogels is that they are very brittle and/or easily dissolve in physiological environments, which limit their use in load-bearing applications. Herein, we describe the preparation of triple-network (TN) hydrogels based on HA and poly(N,N-dimethylacrylamide) (PDMA) of high mechanical strength by sequential gelation reactions. TN hydrogels containing 81-91% water sustain compressive stresses above 20 MPa and exhibit Young's moduli of up to 1 MPa. HA of various degrees of methacrylation was used as a multifunctional macromer for the synthesis of the brittle first-network component, while loosely cross-linked PDMA was used as the ductile, second and third network components of TN hydrogels. By tuning the methacrylation degree of HA, double-network hydrogels with a fracture stress above 10 MPa and a fracture strain of 96% were obtained. Increasing the ratio of ductile-to-brittle components via the TN approach further increases the fracture stress above 20 MPa. Cyclic mechanical tests show that, although TN hydrogels internally fracture even under small strain, the ductile components hinder macroscopic crack propagation by keeping the macroscopic gel samples together.
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Affiliation(s)
- Burak Tavsanli
- Department of Chemistry, Istanbul Technical University, 34469 Istanbul, Turkey.
| | - Volkan Can
- Department of Chemistry, Istanbul Technical University, 34469 Istanbul, Turkey.
| | - Oguz Okay
- Department of Chemistry, Istanbul Technical University, 34469 Istanbul, Turkey.
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168
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Xiong X, Wu Z, Yu Q, Xue L, Du J, Chen H. Reversible Bacterial Adhesion on Mixed Poly(dimethylaminoethyl methacrylate)/Poly(acrylamidophenyl boronic acid) Brush Surfaces. Langmuir 2015; 31:12054-12060. [PMID: 26509287 DOI: 10.1021/acs.langmuir.5b02002] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
A simple and versatile method for the preparation of surfaces to control bacterial adhesion is described. Substrates were first treated with two catechol-based polymerization initiators, one for thermal initiation and one for visible-light photoinitiation. Graft polymerization in sequence of dimethylaminoethyl methacrylate (DMAEMA) and 3-acrylamidebenzene boronic acid (BA) from the surface-bound initiators to form mixed polymer brushes on the substrate was then carried out. The PDMAEMA grafts were thermally initiated and the PBA grafts were visible-light-photoinitiated. Gold, poly(vinyl chloride) (PVC), and poly(dimethylsiloxane) (PDMS) were used as model substrates. X-ray photoelectron spectroscopy (XPS), Fourier transform infrared (FT-IR), and ellipsometry analysis confirmed the successful grafting of PDMAEMA/PBA mixed brushes. We demonstrated that the resulting surfaces showed charge-reversal properties in response to change of pH. The transition in surface charge at a specific pH allowed the surface to be reversibly switched from bacteria-adhesive to bacteria-resistant. At pH 4.5, below the isoelectric points (IEP, pH 5.3) of the mixed brushes, the surfaces are positively charged and the negatively charged Gram-positive S. aureus adheres at high density (2.6 × 10(6) cells/cm(2)) due to attractive electrostatic interactions. Subsequently, upon increasing the pH to 9.0 to give negatively charged polymer brush surface, ∼90% of the adherent bacteria are released from the surface, presumably due to repulsive electrostatic interactions. This approach provides a simple method for the preparation of surfaces on which bacterial adhesion can be controlled and is applicable to a wide variety of substrates.
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Affiliation(s)
- Xinhong Xiong
- Jiangsu Key Laboratory of Advanced Functional Polymer Design and Application, Department of Polymer Science and Engineering, College of Chemistry, Chemical Engineering and Materials Science, Soochow University , 199 Ren-ai Road, Suzhou 215123, P. R. China
| | - Zhaoqiang Wu
- Jiangsu Key Laboratory of Advanced Functional Polymer Design and Application, Department of Polymer Science and Engineering, College of Chemistry, Chemical Engineering and Materials Science, Soochow University , 199 Ren-ai Road, Suzhou 215123, P. R. China
| | - Qian Yu
- Jiangsu Key Laboratory of Advanced Functional Polymer Design and Application, Department of Polymer Science and Engineering, College of Chemistry, Chemical Engineering and Materials Science, Soochow University , 199 Ren-ai Road, Suzhou 215123, P. R. China
| | - Lulu Xue
- Jiangsu Key Laboratory of Advanced Functional Polymer Design and Application, Department of Polymer Science and Engineering, College of Chemistry, Chemical Engineering and Materials Science, Soochow University , 199 Ren-ai Road, Suzhou 215123, P. R. China
| | - Jun Du
- Jiangsu Key Laboratory of Advanced Functional Polymer Design and Application, Department of Polymer Science and Engineering, College of Chemistry, Chemical Engineering and Materials Science, Soochow University , 199 Ren-ai Road, Suzhou 215123, P. R. China
| | - Hong Chen
- Jiangsu Key Laboratory of Advanced Functional Polymer Design and Application, Department of Polymer Science and Engineering, College of Chemistry, Chemical Engineering and Materials Science, Soochow University , 199 Ren-ai Road, Suzhou 215123, P. R. China
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169
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Shen Y, Li G, Ma Y, Yu D, Sun J, Li Z. Smart surfaces based on thermo-responsive polymer brushes prepared from L-alanine derivatives for cell capture and release. Soft Matter 2015; 11:7502-7506. [PMID: 26279262 DOI: 10.1039/c5sm01661d] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Two novel thermo-responsive polymer brushes were prepared from L-alanine derivatives using the surface-initiated atom transfer radical polymerization (SI-ATRP) technique. The temperature-induced cell capture and release on both polymer brush modified substrates were further explored.
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Affiliation(s)
- Yong Shen
- Beijing National Laboratory for Molecular Sciences (BNLMS), Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
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170
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Plenderleith RA, Pateman CJ, Rodenburg C, Haycock JW, Claeyssens F, Sammon C, Rimmer S. Arginine-glycine-aspartic acid functional branched semi-interpenetrating hydrogels. Soft Matter 2015; 11:7567-7578. [PMID: 26280624 DOI: 10.1039/c5sm00695c] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
For the first time a series of functional hydrogels based on semi-interpenetrating networks with both branched and crosslinked polymer components have been prepared and we show the successful use of these materials as substrates for cell culture. The materials consist of highly branched poly(N-isopropyl acrylamide)s with peptide functionalised end groups in a continuous phase of crosslinked poly(vinyl pyrrolidone). Functionalisation of the end groups of the branched polymer component with the GRGDS peptide produces a hydrogel that supports cell adhesion and proliferation. The materials provide a new synthetic functional biomaterial that has many of the features of extracellular matrix, and as such can be used to support tissue regeneration and cell culture. This class of high water content hydrogel material has important advantages over other functional hydrogels in its synthesis and does not require post-processing modifications nor are functional-monomers, which change the polymerisation process, required. Thus, the systems are amenable to large scale and bespoke manufacturing using conventional moulding or additive manufacturing techniques. Processing using additive manufacturing is exemplified by producing tubes using microstereolithography.
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Affiliation(s)
- Richard A Plenderleith
- The Polymer and Biomaterials Chemistry Laboratories, Department of Chemistry, University of Sheffield, Sheffield, South Yorkshire S3 7HF, UK.
| | - Christopher J Pateman
- Department of Materials and Engineering, Kroto Research Institute, University of Sheffield, North Campus, Broad Lane, Sheffield S3 7HQ, UK
| | - Cornelia Rodenburg
- Department of Materials Science and Engineering, University of Sheffield, Mappin Street, Sheffield, S1 3JD, UK
| | - John W Haycock
- Department of Materials and Engineering, Kroto Research Institute, University of Sheffield, North Campus, Broad Lane, Sheffield S3 7HQ, UK
| | - Frederik Claeyssens
- Department of Materials and Engineering, Kroto Research Institute, University of Sheffield, North Campus, Broad Lane, Sheffield S3 7HQ, UK
| | - Chris Sammon
- Materials and Engineering Research Institute, Sheffield Hallam University, Howard Street, Sheffield, South Yorkshire, S1 1WN, UK
| | - Stephen Rimmer
- The Polymer and Biomaterials Chemistry Laboratories, Department of Chemistry, University of Sheffield, Sheffield, South Yorkshire S3 7HF, UK.
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171
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Chen S, Lu X, Zhu D, Lu Q. Targeted grafting of thermoresponsive polymers from a penetrative honeycomb structure for cell sheet engineering. Soft Matter 2015; 11:7420-7427. [PMID: 26268946 DOI: 10.1039/c5sm01769f] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Responsive membranes have been used to construct smart biomaterial interfaces. We report a novel approach to fabricate honeycomb films with a pattern of thermoresponsive polymer, namely poly(N-isopropylacrylamide). The approach was based on a combination of the breath figure method and reversible addition-fragmentation chain transfer. The hybrid film had morphological and chemical patterns resulting in varied wettability and morphology at various stages, as well as high thermo-responsiveness. Enhanced cell adhesion was observed at an incubation temperature of 37 °C, which is above its lower critical solution temperature (LCST). Furthermore, cells could be harvested at temperatures below the LCST without trypsin treatment. The non-invasive characteristics give this membrane potential as a substrate for cell sheet engineering.
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Affiliation(s)
- Shuangshuang Chen
- School of Chemistry and Chemical Engineering, State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai, 200240, China.
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172
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Bae SB, Lee SW. Synthesis of Gold Nanoflowers Encapsulated with Poly(N-isopropylacrylamide-co-acrylic acid) Hydrogels. J Nanosci Nanotechnol 2015; 15:7962-7965. [PMID: 26726447 DOI: 10.1166/jnn.2015.11232] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
In this work, hydrogel-coated gold nanoflowers (AuNFs@hydrogel) were facilely prepared. First, gold nanoflowers (AuNFs) were synthesized by reducing gold acid with ascorbic acid in the presence of chitosan biopolymers, and the chitosan-mediated AuNFs were subsequently conjugated with oleic acid with carboxylate groups. Finally, the olefin-conjugated AuNFs were encapsulated with P(NIPAM-co-AAC) hydrogels via a radical polymerization reaction with co-monomer ratio of [NIPAM:AAc = 91:9 wt%]. The encapsulated hydrogels had a lower critical solution temperature (LCST) slightly above the physiological temperature and demonstrated a thermo-sensitive variation of particle size. The hydrogel-coated AuNFs can be utilized as a promising thermo-responsive drug delivery system with a unique optical property. As-prepared samples were characterized by DLS, SEM, TEM, UV-vis and Zeta potential meter.
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173
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Saxena S, Lyon LA. Influence of binary microgel phase behavior on the assembly of multi-functional raspberry-structured microgel heteroaggregates. J Colloid Interface Sci 2015; 455:93-100. [PMID: 26057600 PMCID: PMC4475458 DOI: 10.1016/j.jcis.2015.05.031] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2015] [Revised: 05/15/2015] [Accepted: 05/18/2015] [Indexed: 12/23/2022]
Abstract
We investigate the influence of microgel composition on phase behavior of binary microgel dispersions using poly(N-isopropylacrylamide) microgels cross-linked with 5 mol% and 1 mol% N,N'-methylenebis(acrylamide), or poly(N-isopropylmethacrylamide) microgels cross-linked with 5 mol% N,N'-methylenebis(acrylamide). We then explore the dispersion phase behavior in the context of microgel deposition at a planar interface. These results are then compared to the observed assembly of microgels at curved interfaces, in the form of raspberry-like patchy particles (RLPPs) consisting of a polystyrene core surrounded by a (two-component) microgel shell. Results suggest that microgel composition has a large influence on the ability of binary dispersions to coat planar and curved interfaces. In particular, we demonstrate that binary dispersions of microgels containing higher cross-linker content exhibit decreased packing densities that are very pronounced at a curved interface. To enhance packing density we also explore the use of a two-step coating process to fabricate RLPPs with enhanced control over topography. Development of these complex vehicles is potentially beneficial in the modulation of biological systems where spatial and temporal presentation of molecules can have a large influence on cellular behavior.
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Affiliation(s)
- Shalini Saxena
- School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA; Petit Institute for Biosciences and Bioengineering, Georgia Institute of Technology, Atlanta, GA 30332, USA.
| | - L Andrew Lyon
- Petit Institute for Biosciences and Bioengineering, Georgia Institute of Technology, Atlanta, GA 30332, USA; Schmid College of Science and Technology, Chapman University, Orange, CA 92866, USA.
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174
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Bennevault V, Huin C, Guégan P, Evgeniya K, Qiu XP, Winnik FM. Temperature sensitive supramolecular self assembly of per-6-PEO-β-cyclodextrin and α,ω-di-(adamantylethyl)poly(N-isopropylacrylamide) in water. Soft Matter 2015; 11:6432-6443. [PMID: 26179328 DOI: 10.1039/c5sm01293g] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The host/guest interactions in water of a star polymer consisting of a β-cyclodextrin (β-CD) core bearing six poly(ethylene oxide) arms linked to the C6 positions of β-CD (β-CD-PEO7, Mn 5000 g mol(-1)) and α,ω-di-(adamantylethyl)poly(N-isopropylacrylamide) (Ad-PNIPAM-12K, Mn 12,000 g mol(-1)) were studied by 1D and 2D (1)H and (13)C NMR spectroscopy, isothermal calorimetry (ITC), and light scattering (LS). In cold water (T < 26 °C) supramolecular "dumbbell" assemblies, consisting of PNIPAM chains with β-CD/Ad inclusion complexes at each end, formed viaβ-CD-insertion of the terminal Ads through the β-CD secondary face. Light scattering, microcalorimetry (DSC), and DOSY NMR studies indicated that mixed aqueous solutions of β-CD-PEO7 and Ad-PNIPAM-12K undergo a reversible heat-induced phase transition at ∼32 °C, accompanied by a release of a fraction of the Ad-bound β-CD-PEO7 into bulk solution and the formation of aggregated Ad-PNIPAM-12K stabilized by a β-CD-PEO7 shell.
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Affiliation(s)
- V Bennevault
- Université d'Evry Val d'Essonne, 91025 Evry Cedex, France
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175
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Liu S, Cheng P, Liu W, Zeng JG. Ascorbic Acid-Initiated Tandem Radical Cyclization of N-Arylacrylamides to Give 3,3-Disubstituted Oxindoles. Molecules 2015; 20:15631-42. [PMID: 26343622 PMCID: PMC6332015 DOI: 10.3390/molecules200915631] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2015] [Revised: 08/18/2015] [Accepted: 08/21/2015] [Indexed: 11/16/2022] Open
Abstract
An ascorbic acid-promoted and metal-free tandem room temperature cyclization of N-arylacrylamides with 4-nitrobenzenediazonium generated in situ was developed. This reaction proceeds smoothly through a radical mechanism and provides an environmentally friendly alternative approach to biologically active 3-alkyl-3-benzyloxindoles, avoiding the use of excess oxidants and light irradiation.
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Affiliation(s)
- Sheng Liu
- Hunan Co-Innovation Center for Utilization of Botanicals Functional Ingredients, Hunan Agricultural University, Changsha 410128, China.
| | - Pi Cheng
- Hunan Co-Innovation Center for Utilization of Botanicals Functional Ingredients, Hunan Agricultural University, Changsha 410128, China.
- Pre-State Key Laboratory for Germplasm Innovation and Utilization of Crop, Hunan Agricultural University, Changsha 410128, China.
| | - Wei Liu
- Hunan Co-Innovation Center for Utilization of Botanicals Functional Ingredients, Hunan Agricultural University, Changsha 410128, China.
| | - Jian-Guo Zeng
- Hunan Co-Innovation Center for Utilization of Botanicals Functional Ingredients, Hunan Agricultural University, Changsha 410128, China.
- Pre-State Key Laboratory for Germplasm Innovation and Utilization of Crop, Hunan Agricultural University, Changsha 410128, China.
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176
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Shamay Y, Raviv L, Golan M, Voronov E, Apte RN, David A. Inhibition of primary and metastatic tumors in mice by E-selectin-targeted polymer-drug conjugates. J Control Release 2015; 217:102-12. [PMID: 26297207 DOI: 10.1016/j.jconrel.2015.08.029] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2015] [Revised: 08/13/2015] [Accepted: 08/13/2015] [Indexed: 12/20/2022]
Abstract
There is currently no effective means to prevent or control metastatic dissemination of cancer cells. E-selectin, an adhesion molecule expressed exclusively on inflamed and angiogenic blood vessels, plays an important role in several rate-limiting steps of cancer metastasis. In this study, we assessed the in vivo antitumor efficacy of N-(2-hydroxypropyl)methacrylamide (HPMA) copolymers conjugated to an E-selectin binding peptide (Esbp, DITWDQLWDLMK) and equipped with the chemotherapeutic drug doxorubicin (P-(Esbp)-DOX) or with the proapoptotic peptide D(KLAKLAK)2 (P-(Esbp)-KLAK). Following a single intravenous injection, P-(Esbp)-DOX reduced tumor growth rate and prolonged the survival of mice bearing primary Lewis lung carcinoma (3LL) tumors significantly more than treatment with a non-targeted copolymer (P-DOX) or with free DOX. In an experimental B16-F10 lung metastasis model, a single intravenous dose of P-(Esbp)-DOX or P-(Esbp)-KLAK prolonged mice survival time significantly more than the non-targeted copolymers or the free drugs, and the percentage of complete tumor regression increased with increasing doses and with dosing frequency. In addition, mice pretreated with an E-selectin-targeted "drug-free" copolymer (P-(Esbp)-FITC) exhibited significantly fewer B16-F10 tumor foci in the lungs as compared with non-treated mice, demonstrating the anti-metastatic properties of the copolymer and its ability to control cancer spread through E-selectin-mediated interactions. Biodistribution analysis further confirmed the preferential accumulation of the E-selectin-targeted near-infrared fluorescently-labeled copolymer P-(Esbp)-IR783 in B16-F10 lung metastases. Taken together, this study demonstrates, for the first time, that the E-selectin targeted copolymer-drug conjugates can inhibit primary tumor growth and prevent metastases in vivo.
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Affiliation(s)
- Yosi Shamay
- Department of Clinical Biochemistry and Pharmacology, Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer-Sheva, Israel
| | - Lior Raviv
- Department of Clinical Biochemistry and Pharmacology, Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer-Sheva, Israel
| | - Moran Golan
- Department of Clinical Biochemistry and Pharmacology, Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer-Sheva, Israel
| | - Elena Voronov
- The Shraga Segal Department of Microbiology, Immunology and Genetics, Faculty of Health Sciences, The Cancer Research Center, Ben-Gurion University of the Negev, Beer-Sheva, Israel
| | - Ron N Apte
- The Shraga Segal Department of Microbiology, Immunology and Genetics, Faculty of Health Sciences, The Cancer Research Center, Ben-Gurion University of the Negev, Beer-Sheva, Israel
| | - Ayelet David
- Department of Clinical Biochemistry and Pharmacology, Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer-Sheva, Israel.
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177
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Abstract
Self-healing oxime-functional hydrogels have been developed that undergo a reversible gel-to-sol transition via oxime exchange under acidic conditions. Keto-functional copolymers were prepared by conventional radical polymerization of N,N-dimethylacrylamide (DMA) and diacetone acrylamide (DAA). The resulting water soluble copolymers (P(DMA-stat-DAA)) were chemically crosslinked with difunctional alkoxyamines to obtain hydrogels via oxime formation. Gel-to-sol transitions were induced by the addition of excess monofunctional alkoxyamines to promote competitive oxime exchange under acidic conditions at 25 °C. The hydrogel could autonomously heal after it was damaged due to the dynamic nature of the oxime crosslinks. In addition to their chemo-responsive behavior, the P(DMA-stat-DAA) copolymers exhibit cloud points which vary with the DAA content in the copolymers. This thermo-responsive behavior of the P(DMA-stat-DAA) was utilized to form physical hydrogels above their cloud point. Therefore, these materials can either form dynamic-covalent or physically-crosslinked gels, both of which demonstrate reversible gelation behavior.
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Affiliation(s)
- Soma Mukherjee
- George & Josephine Butler Polymer Research Laboratory, Center for Macromolecular Science & Engineering, Department of Chemistry, University of Florida, Gainesville, FL 32611-7200, USA.
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178
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Zhou B, Gao X, Wang C, Ye Z, Gao Y, Xie J, Wu X, Wen W. Functionalized PDMS with Versatile and Scalable Surface Roughness Gradients for Cell Culture. ACS Appl Mater Interfaces 2015; 7:17181-17187. [PMID: 26194178 DOI: 10.1021/acsami.5b04032] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
This manuscript describes a simple and versatile approach to engineering surface roughness gradients via combination of microfluidics and photopolymerization. Through UV-mediated polymerization, N-isopropylacrylamide with concentration gradients are successfully grafted onto PDMS surface, leading to diverse roughness degrees on the obtained PDMS substrate. Furthermore, the extent of surface roughness can be controllably regulated via tuning the flow rate ratio between the monomer solution and deionized water. Average roughness ranging from 2.6±0.7 nm to 163.6±11.7 nm has been well-achieved in this work. Such PDMS samples are also demonstrated to be capable of working as supporting substrates for controlling cell adhesion or detachment. Because of the different degrees of surface roughness on a single substrate, our method provides an effective approach for designing advanced surfaces for cell culture. Finally, the thermosensitive property of N-isopropylacrylamide makes our sample furnish as another means for controlling the cell detachment from the substrates with correspondence to the surrounding temperature.
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Affiliation(s)
| | - Xinghua Gao
- ‡Biomedical Research Institute, Shenzhen Peking University-The Hong Kong University of Science and Technology Medical Center, Shenzhen, People's Republic of China
| | | | | | | | - Jiao Xie
- ⊥The Soft Matter and Interdisciplinary Research Institute, College of Physics, Chongqing University, Chongqing, China
| | | | - Weijia Wen
- ‡Biomedical Research Institute, Shenzhen Peking University-The Hong Kong University of Science and Technology Medical Center, Shenzhen, People's Republic of China
- ⊥The Soft Matter and Interdisciplinary Research Institute, College of Physics, Chongqing University, Chongqing, China
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179
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Rose S, Marcellan A, Narita T, Boué F, Cousin F, Hourdet D. Structure investigation of nanohybrid PDMA/silica hydrogels at rest and under uniaxial deformation. Soft Matter 2015; 11:5905-5917. [PMID: 26119868 DOI: 10.1039/c5sm01121c] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Nano-hybrid hydrogels were prepared by cross-linking polymerization of N,N-dimethylacrylamide (DMA) within a dispersion of silica nano-particles. Working at constant polymer/water ratio, the mechanical properties of hydrogels can be finely tuned by changing either the level of covalent cross-linker and/or the amount of particles that act as physical cross-linkers through specific adsorption of PDMA chains. Whatever is the cross-linking ratio (from 0 to 1 mol%), the introduction of silica nano-particles dramatically improves the mechanical behavior of hydrogels with a concomitant increase of stiffness and nominal strain at failure. The physical interactions being reversible in nature, the dynamics of the adsorption/desorption process of PDMA chains directly controls the time-dependence of the mechanical properties. Small angle neutron scattering experiments, performed in contrast matching conditions, show that silica particles, which repel themselves at short range, remain randomly dispersed during the formation of the PDMA network. Although PDMA chains readily interact with silica particles, no significant variation of the polymer concentration was observed in the vicinity of silica surfaces. Together with the time dependence of physical interactions pointed out by mechanical analyses, this result is attributed to the moderate adsorption energy of PDMA chains with silica surfaces at pH 9. From 2D SANS experiments, it was shown that strain rapidly gives rise to a non affine deformation of the hybrid network with shearing due to the transverse compression of the particles. After loading at intermediate deformation, the particles recover their initial distribution due to the covalent network that is not damaged in these conditions. That is no longer true at high deformation where residual anisotropy is observed.
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Affiliation(s)
- Séverine Rose
- ESPCI/Sorbonne Universités, UPMC Univ Paris 06/CNRS, UMR 7615, SIMM, 10 rue Vauquelin, F-75005, Paris, France.
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180
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Melzak KA, Yu K, Bo D, Kizhakkedathu JN, Toca-Herrera JL. Chain Length and Grafting Density Dependent Enhancement in the Hydrolysis of Ester-Linked Polymer Brushes. Langmuir 2015; 31:6463-6470. [PMID: 26010390 DOI: 10.1021/acs.langmuir.5b01424] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Poly(N,N-dimethylacrylamide) (PDMA) brushes with different grafting density and chain length were grown from an ester group-containing initiator using surface-initiated polymerization. Hydrolysis of the PDMA chains from the surface was monitored by measuring thickness of the polymer layer by ellipsometry and extension length by atomic force microscopy. It was found that the initial rate of cleavage of one end-tethered PDMA chains was dependent on the grafting density and chain length; the hydrolysis rate was faster for high grafting density brushes and brushes with higher molecular weights. Additionally, the rate of cleavage of polymer chains during a given experiment changed by up to 1 order of magnitude as the reaction progressed, with a distinct transition to a lower rate as the grafting density decreased. Also, polymer chains undergo selective cleavage, with longer chains in a polydisperse brush being preferentially cleaved at one stage of the hydrolysis reaction. We suggest that the enhanced initial hydrolysis rates seen at high grafting densities and high chain lengths are due to mechanical activation of the ester bond connecting the polymer chains to the surface in association with high lateral pressure within the brush. These results have implications for the preparation of polymers brushes, their stability under harsh conditions, and the analysis of polymer brushes from partial hydrolysates.
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Affiliation(s)
- Kathryn A Melzak
- †Institute for Biophysics, Department of Nanobiotechnology, University of Natural Resources and Life Sciences Vienna (BOKU), Muthgasse 11, A-1190, Vienna, Austria
| | | | | | | | - José L Toca-Herrera
- †Institute for Biophysics, Department of Nanobiotechnology, University of Natural Resources and Life Sciences Vienna (BOKU), Muthgasse 11, A-1190, Vienna, Austria
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181
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GhavamiNejad A, Rajan Unnithan A, Ramachandra Kurup Sasikala A, Samarikhalaj M, Thomas RG, Jeong YY, Nasseri S, Murugesan P, Wu D, Hee Park C, Kim CS. Mussel-Inspired Electrospun Nanofibers Functionalized with Size-Controlled Silver Nanoparticles for Wound Dressing Application. ACS Appl Mater Interfaces 2015; 7:12176-83. [PMID: 25989513 DOI: 10.1021/acsami.5b02542] [Citation(s) in RCA: 134] [Impact Index Per Article: 14.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Electrospun nanofibers that contain silver nanoparticles (AgNPs) have a strong antibacterial activity that is beneficial to wound healing. However, most of the literature available on the bactericidal effects of this material is based on the use of AgNPs with uncontrolled size, shape, surface properties, and degree of aggregation. In this study, we report the first versatile synthesis of novel catechol moieties presenting electrospun nanofibers functionalized with AgNPs through catechol redox chemistry. The synthetic strategy allows control of the size and amount of AgNPs on the surface of nanofibers with the minimum degree of aggregation. We also evaluated the rate of release of the AgNPs, the biocompatibility of the nanofibers, the antibacterial activity in vitro, and the wound healing capacity in vivo. Our results suggest that these silver-releasing nanofibers have great potential for use in wound healing applications.
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Affiliation(s)
| | | | | | | | - Reju George Thomas
- §Department of Radiology, Chonnam National University Hwasun Hospital, Chonnam National University Medical School, Gwangju 501-746, Republic of Korea
| | - Yong Yeon Jeong
- §Department of Radiology, Chonnam National University Hwasun Hospital, Chonnam National University Medical School, Gwangju 501-746, Republic of Korea
| | - Saeed Nasseri
- ⊥Department of BIN Fusion Technology, Chonbuk National University, Jeonju, South Korea
| | - Priya Murugesan
- ⊥Department of BIN Fusion Technology, Chonbuk National University, Jeonju, South Korea
| | - Dongmei Wu
- ⊥Department of BIN Fusion Technology, Chonbuk National University, Jeonju, South Korea
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182
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Zhang LL, Liao YW, Gao HJ, Wang ZZ, Shuai C. [Removal Congo Red from Aqueous Solution Using Poly (AM-co-DVB)]. Huan Jing Ke Xue 2015; 36:2195-2202. [PMID: 26387325] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Poly(AM-co-DVB) was synthesized by acrylamide(AM) and divinylbenzene(DVB) via the crosslinking reaction. The microscope structure and thermal stability of Poly(AM-co-DVB) were characterized by FT-IR, SEM and TG. Congo red (CR) was used to measure the adsorptive capacity of Poly (AM-co-DVB). The effects of initial pH, contact time and temperature on the adsorption of CR on Poly (AM-co-DVB) were investigated in this work. The kinetics, equilibrium, and thermodynamics of the adsorption process were also discussed. The results showed that the maximum adsorption capacities were 319.1 mg x g(-1) at pH = 7.25 and contact time = 3 h. The adsorption kinetics was well fitted by a pseudo-second-order model and the adsorption isotherms agreed well with the Langmuir model. The adsorption process was spontaneous process. Above all, the adsorption capacity of Poly (AM-co-DVB) on Congo red is significant.
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183
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Xu D, Yu H, Xu Q, Xu G, Wang K. Thermoresponsive Photonic Crystal: Synergistic Effect of Poly(N-isopropylacrylamide)-co-acrylic Acid and Morpho Butterfly Wing. ACS Appl Mater Interfaces 2015; 7:8750-8756. [PMID: 25859786 DOI: 10.1021/acsami.5b01156] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
In this work, we report a simple method to fabricate smart polymers engineered with hierarchical photonic structures of Morpho butterfly wing to present high performance that are capable of color tunability over temperature. The materials were assembled by combining functional temperature responsivity of poly(N-isopropylacrylamide)-co-acrylic acid (PNIPAm-co-AAc) with the biological photonic crystal (PC) structure of Morpho butterfly wing, and then the synergistic effect between the functional polymer and the natural PC structure was created. Their cooperativity is instantiated in the phase transition of PNIPAm-co-AAc (varying with the change of temperature) that can alter the nanostructure of PCs, which further leads to the reversible spectrum response property of the modified hierarchical photonic structures. The cost-effective biomimetic technique presented here highlights the bright prospect of fabrication of more stimuli-responsive functional materials via coassembling smart polymers and biohierarchical structures, and it will be an important platform for the development of nanosmart biomaterials.
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Affiliation(s)
- Dongdong Xu
- College of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450052, China
| | - Huanan Yu
- College of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450052, China
| | - Qun Xu
- College of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450052, China
| | - Guiheng Xu
- College of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450052, China
| | - Kaixi Wang
- College of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450052, China
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184
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Bygd HC, Forsmark KD, Bratlie KM. Altering in vivo macrophage responses with modified polymer properties. Biomaterials 2015; 56:187-97. [PMID: 25934291 DOI: 10.1016/j.biomaterials.2015.03.042] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2014] [Revised: 03/16/2015] [Accepted: 03/20/2015] [Indexed: 12/13/2022]
Abstract
Macrophage reprogramming has long been the focus of research in disease therapeutics and biomaterial implantation. With different chemical and physical properties of materials playing a role in macrophage polarization, it is important to investigate and categorize the activation effects of material parameters both in vitro and in vivo. In this study, we have investigated the effects of material surface chemistry on in vivo polarization of macrophages. The library of materials used here include poly(N-isopropylacrylamide-co-acrylic acid) (p(NIPAm-co-AAc)) nanoparticles (∼600 nm) modified with various functional groups. This study also focuses on the development of a quantitative structure-activity relationship method (QSAR) as a predictive tool for determining the macrophage polarization in response to particular biomaterial surface chemistries. Here, we successfully use in vivo imaging and histological analysis to identify the macrophage response and activation. We demonstrate the ability to induce a spectrum of macrophage phenotypes with a change in material functionality as well as identify certain material parameters that seem to correlate with each phenotype. This suggests the potential to develop materials for a variety of applications and predict the outcome of macrophage activation in response to new surface chemistries.
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Affiliation(s)
- Hannah C Bygd
- Department of Materials Science & Engineering, Iowa State University, Ames, IA 50011, USA
| | - Kiva D Forsmark
- Department of Chemical & Biological Engineering, Iowa State University, Ames, IA 50011, USA
| | - Kaitlin M Bratlie
- Department of Materials Science & Engineering, Iowa State University, Ames, IA 50011, USA; Department of Chemical & Biological Engineering, Iowa State University, Ames, IA 50011, USA; Ames National Laboratory, Ames, IA 50011, USA.
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185
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Beretta GL, Folini M, Cavalieri F, Yan Y, Fresch E, Kaliappan S, Hasenöhrl C, Richardson JJ, Tinelli S, Fery A, Caruso F, Zaffaroni N. Unravelling "off-target" effects of redox-active polymers and polymer multilayered capsules in prostate cancer cells. Nanoscale 2015; 7:6261-6270. [PMID: 25779724 DOI: 10.1039/c4nr07240e] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Redox-active polymers and carriers are oxidizing nanoagents that can potentially trigger intracellular off-target effects. In the present study, we investigated the occurrence of off-target effects in prostate cancer cells following exposure to redox-active polymer and thin multilayer capsules with different chemical properties. We show that, depending on the intracellular antioxidant capacity, thiol-functionalized poly(methacrylic acid), PMA(SH) triggers cell defense responses/perturbations that result in off-target effects (i.e., induction of autophagy and down-regulation of survivin). Importantly, the conversion of the carboxyl groups of PMA(SH) into the neutral amides of poly(hydroxypropylmetacrylamide) (pHPMA(SH)) nullified the off-target effects and cytotoxicity in tested cell lines. This suggests that the simultaneous action of carboxyl and disulfide groups in PMA(SH) polymer or capsules may play a role in mediating the intracellular off-target effects. Our work provides evidence that the rational design of redox-active carriers for therapeutic-related application should be guided by a careful investigation on potential disturbance of the cellular machineries related to the carrier association.
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Affiliation(s)
- Giovanni L Beretta
- Department of Experimental Oncology and Molecular Medicine, Fondazione IRCCS Istituto Nazionale dei Tumori, Via G. Amadeo 42, 20133 Milan, Italy.
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186
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Poh S, Lin JB, Panitch A. Release of anti-inflammatory peptides from thermosensitive nanoparticles with degradable cross-links suppresses pro-inflammatory cytokine production. Biomacromolecules 2015; 16:1191-200. [PMID: 25728363 PMCID: PMC4839979 DOI: 10.1021/bm501849p] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Pro-inflammatory cytokines tumor necrosis factor α (TNF-α) and interleukin 6 (IL-6) are mediators in the development of many inflammatory diseases. To demonstrate that macrophages take up and respond to thermosensitive nanoparticle drug carriers, we synthesized PEGylated poly(N-isopropylacrylamide-2-acrylamido-2-methyl-1-propanesulfonate) particles cross-linked with degradable disulfide (N,N'-bis(acryloyl)cystamine) (NGPEGSS). An anti-inflammatory peptide (KAFAK) was loaded and released from the thermosensitive nanoparticles and shown to suppress levels of TNF-α and IL-6 production in macrophages. Cellular uptake of fluorescent, thermosensitive, and degradable nanoparticles and therapeutic efficacy of free KAFAK peptide compared to that of KAFAK loaded in PEGylated degradable thermosensitive nanoparticles were examined. The data suggests that the degradable, thermosensitive nanoparticles loaded with KAFAK may be an effective tool to treat inflammatory diseases.
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Affiliation(s)
- Scott Poh
- Weldon School of Biomedical Engineering, Purdue University, 206 South Martin Jischke Drive, West Lafayette, Indiana 47907, United States
| | - Jenny B Lin
- Weldon School of Biomedical Engineering, Purdue University, 206 South Martin Jischke Drive, West Lafayette, Indiana 47907, United States
| | - Alyssa Panitch
- Weldon School of Biomedical Engineering, Purdue University, 206 South Martin Jischke Drive, West Lafayette, Indiana 47907, United States
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187
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Zhong L, Yeh TYJ, Hao J, Pourtabatabaei N, Mahata SK, Shao J, Chessler SD, Chi NW. Nutritional energy stimulates NAD+ production to promote tankyrase-mediated PARsylation in insulinoma cells. PLoS One 2015; 10:e0122948. [PMID: 25876076 PMCID: PMC4395342 DOI: 10.1371/journal.pone.0122948] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2014] [Accepted: 02/16/2015] [Indexed: 02/06/2023] Open
Abstract
The poly-ADP-ribosylation (PARsylation) activity of tankyrase (TNKS) regulates diverse physiological processes including energy metabolism and wnt/β-catenin signaling. This TNKS activity uses NAD+ as a co-substrate to post-translationally modify various acceptor proteins including TNKS itself. PARsylation by TNKS often tags the acceptors for ubiquitination and proteasomal degradation. Whether this TNKS activity is regulated by physiological changes in NAD+ levels or, more broadly, in cellular energy charge has not been investigated. Because the NAD+ biosynthetic enzyme nicotinamide phosphoribosyltransferase (NAMPT) in vitro is robustly potentiated by ATP, we hypothesized that nutritional energy might stimulate cellular NAMPT to produce NAD+ and thereby augment TNKS catalysis. Using insulin-secreting cells as a model, we showed that glucose indeed stimulates the autoPARsylation of TNKS and consequently its turnover by the ubiquitin-proteasomal system. This glucose effect on TNKS is mediated primarily by NAD+ since it is mirrored by the NAD+ precursor nicotinamide mononucleotide (NMN), and is blunted by the NAMPT inhibitor FK866. The TNKS-destabilizing effect of glucose is shared by other metabolic fuels including pyruvate and amino acids. NAD+ flux analysis showed that glucose and nutrients, by increasing ATP, stimulate NAMPT-mediated NAD+ production to expand NAD+ stores. Collectively our data uncover a metabolic pathway whereby nutritional energy augments NAD+ production to drive the PARsylating activity of TNKS, leading to autoPARsylation-dependent degradation of the TNKS protein. The modulation of TNKS catalytic activity and protein abundance by cellular energy charge could potentially impose a nutritional control on the many processes that TNKS regulates through PARsylation. More broadly, the stimulation of NAD+ production by ATP suggests that nutritional energy may enhance the functions of other NAD+-driven enzymes including sirtuins.
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Affiliation(s)
- Linlin Zhong
- Research Service, VA San Diego Healthcare System, San Diego, CA 92161, United States of America
- Department of Medicine, University of California San Diego, La Jolla, CA 92093, United States of America
| | - Tsung-Yin J. Yeh
- Department of Medicine, University of California San Diego, La Jolla, CA 92093, United States of America
| | - Jun Hao
- Department of Medicine, University of California San Diego, La Jolla, CA 92093, United States of America
- Department of Pathology, Hebei Medical University, Shijiazhuang, China
| | - Nasim Pourtabatabaei
- Department of Medicine, University of California San Diego, La Jolla, CA 92093, United States of America
| | - Sushil K. Mahata
- Research Service, VA San Diego Healthcare System, San Diego, CA 92161, United States of America
- Department of Medicine, University of California San Diego, La Jolla, CA 92093, United States of America
| | - Jianhua Shao
- Department of Pediatrics, University of California San Diego, La Jolla, CA 92093, United States of America
| | - Steven D. Chessler
- Department of Medicine, University of California Irvine, Irvine, CA 92697, United States of America
| | - Nai-Wen Chi
- Research Service, VA San Diego Healthcare System, San Diego, CA 92161, United States of America
- Department of Medicine, University of California San Diego, La Jolla, CA 92093, United States of America
- * E-mail:
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188
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Ghoneim MM, El-Sonbati AZ, El-Bindary AA, Diab MA, Serag LS. Polymer complexes. LX. Supramolecular coordination and structures of N(4-(acrylamido)-2-hydroxybenzoic acid) polymer complexes. Spectrochim Acta A Mol Biomol Spectrosc 2015; 140:111-131. [PMID: 25589393 DOI: 10.1016/j.saa.2014.12.056] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/16/2014] [Revised: 11/27/2014] [Accepted: 12/17/2014] [Indexed: 06/04/2023]
Abstract
A number of novel polymer complexes of various anions of copper(II), cobalt(II), nickel(II) and uranyl(II) with N(4-(acrylamido)-2-hydroxy benzoic acid) (ABH) have been synthesized and characterized by elemental analysis, IR, 1H NMR, magnetic susceptibility measurements, electronic spin resonance, vibrational spectra and thermal analysis. The molecular structures of the ligand are optimized theoretically and the quantum chemical parameters are calculated. Tentative structures for the polymeric metal complexes due to their potential application are also suggested. The IR data exhibit the coordination of ONO2/OAc/SO4 with the metal ions in the polymeric metal complex. Vibrational spectra indicate coordination of carboxylate oxygen and phenolic OH of the ligand giving a MO4 square planar chromophore. Ligand field ESR spectra support square planar geometry around Cu(II). The thermal decomposition of the polymer complexes were discussed in relation to structure, and the thermodynamic parameters of the decomposition stages were evaluated applying Coast-Redfern and Horowitz-Metzger methods.
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Affiliation(s)
- M M Ghoneim
- Chemistry Department, Faculty of Science, Tanta University, Tanta, Egypt
| | - A Z El-Sonbati
- Chemistry Department, Faculty of Science, Damietta University, Damietta, Egypt.
| | - A A El-Bindary
- Chemistry Department, Faculty of Science, Damietta University, Damietta, Egypt
| | - M A Diab
- Chemistry Department, Faculty of Science, Damietta University, Damietta, Egypt
| | - L S Serag
- Chemistry Department, Faculty of Science, Damietta University, Damietta, Egypt
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189
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Lin P, Ma S, Wang X, Zhou F. Molecularly engineered dual-crosslinked hydrogel with ultrahigh mechanical strength, toughness, and good self-recovery. Adv Mater 2015; 27:2054-9. [PMID: 25677412 DOI: 10.1002/adma.201405022] [Citation(s) in RCA: 455] [Impact Index Per Article: 50.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/03/2014] [Revised: 12/20/2014] [Indexed: 05/22/2023]
Abstract
A molecularly engineered dual-crosslinked hydrogel with extraordinary mechanical properties is reported. The hydrogel network is formed with both chemical crosslinking and acrylic-Fe(III) coordination; these, respectively, impart the elasticity and enhance the mechanical properties by effectively dissipating energy. The optimal hydrogel achieves a tensile stress of ca. 6 MPa at a large elongation ratio (>7 times), a toughness of 27 MJ m(-3) , and a stiffness of ca. 2 MPa, and has good self-recovery properties.
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Affiliation(s)
- Peng Lin
- State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, 730000, China; University of Chinese Academy of Sciences, Beijing, 100049, China
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190
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Li R, Gao B, Ma D, Rong H, Sun S, Wang F, Yue Q, Wang Y. Effects of chlorination operating conditions on trihalomethane formation potential in polyaluminum chloride-polymer coagulated effluent. J Hazard Mater 2015; 285:103-108. [PMID: 25497022 DOI: 10.1016/j.jhazmat.2014.11.048] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/24/2014] [Revised: 10/06/2014] [Accepted: 11/02/2014] [Indexed: 06/04/2023]
Abstract
In this study, coagulation performance of polyaluminum chloride (PAC) and PAC-lignin acrylamide (PAC+LAM) in reservoir water treatment was contrastively analyzed. Effects of operating conditions including chlorine dose, contact time and pH on the formation potential of trihalomethanes (THMs) during chlorination in coagulated effluent were also investigated. Comparing with PAC, PAC+LAM achieved higher efficiency in the removal of THMs precursors. TTHM yield in unfiltered water samples (UW) was greater than that of filtered water (FW) due to the residual dissolved organic matter (DOM) in the suspended particles or micro flocs. Meanwhile, operating conditions during chlorination had a significant influence on THMs formation potential. With chlorine dose rising, mass ratio of CHCl3 to TTHM increased, whereas that of CHBr2Cl decreased due to higher Cl2/Br(-) molar ratio. TTHM and CHCl3 levels rose with the increase of pH. Under a given chlorination condition, there was a minor effect of contact time on THM speciation.
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Affiliation(s)
- Ruihua Li
- Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, No. 27 Shanda South Road, Jinan 250100, Shandong, People's Republic of China
| | - Baoyu Gao
- Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, No. 27 Shanda South Road, Jinan 250100, Shandong, People's Republic of China.
| | - Defang Ma
- Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, No. 27 Shanda South Road, Jinan 250100, Shandong, People's Republic of China
| | - Hongyan Rong
- Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, No. 27 Shanda South Road, Jinan 250100, Shandong, People's Republic of China
| | - Shenglei Sun
- Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, No. 27 Shanda South Road, Jinan 250100, Shandong, People's Republic of China
| | - Fang Wang
- Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, No. 27 Shanda South Road, Jinan 250100, Shandong, People's Republic of China
| | - Qinyan Yue
- Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, No. 27 Shanda South Road, Jinan 250100, Shandong, People's Republic of China
| | - Yan Wang
- Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, No. 27 Shanda South Road, Jinan 250100, Shandong, People's Republic of China
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191
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Venault A, Zheng YS, Chinnathambi A, Alharbi SA, Ho HT, Chang Y, Chang Y. Stimuli-responsive and hemocompatible pseudozwitterionic interfaces. Langmuir 2015; 31:2861-2869. [PMID: 25680392 DOI: 10.1021/la505000m] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
We report a novel biomacromolecular formula for the design of hemocompatible gel interfaces of N-isopropylacrylamide (NIPAAm) and mixed-charge pairs of [2-(methacryloyloxy)ethyl]trimethylammonium (TMA) and 3-sulfopropyl methacrylate (SA) with overall electrical neutrality. The study stresses on how well-defined compositions of nonionic NIPAAm and pseudozwitterionic TMA/SA in the poly(NIPAAm-co-TMA/SA) hydrogels along with environmental conditions (temperature, ionic strength, and solution pH) affect swelling and adhesion of biofoulants on their surfaces. When challenged with plasma proteins, bacteria, recalcified platelets, or whole blood, stimuli-responsive hydrogels better resisted their adhesion as the content of mixed charges in the copolymer increased, to reach nonbiofouling for the gels made of 100% TMA/SA. The low hemolytic activity (0.5%) associated with a long plasma clotting time (10 min) suggests excellent hemocompatibility excellent hemocompatibility. Finally, hydrogels containing both NIPAAm and TMA/SA tend to exhibit preferential adhesion of leukocytes.
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Affiliation(s)
- Antoine Venault
- R&D Center for Membrane Technology and Department of Chemical Engineering, Chung Yuan Christian University , Jhong-Li, Taoyuan 320, Taiwan
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192
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Musiał W, Pluta J, Byrski T, Valh JV. The Conductivity and pH Values of Dispersions of Nanospheres for Targeted Drug Delivery in the Course of Forced Equilibrium Dialysis. ADV CLIN EXP MED 2015; 24:219-26. [PMID: 25931352 DOI: 10.17219/acem/40468] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
BACKGROUND In the available literature, the problem of pH and conductivity in FED is evaluated separately, and limited mainly to the final purity of the synthesized polymer. In this study data from conductivity and pH measurements were evaluated in the context of the structure of the macromolecule. OBJECTIVES The aim of the study was to evaluate the conductivity and pH of dispersions of nanospheres synthesized with the use of N-isopropyl acrylamide (NIPA) as the main monomer, N,N'-methylenebisacrylamide (MBA) as the cross-linker and acrylic acid (AcA) as the anionic comonomer during the purification of dispersions via forced equilibrium dialysis (FED). MATERIAL AND METHODS Six batches of nanospheres were obtained in the process of surfactant free precipitation polymerization (SFPP) under inert nitrogen. The conductivity and pH of the dispersions of nanospheres were measured at the beginning of FED and after finishing that process. The conductivity in the systems being studied decreased significantly in the process of FED. The initial values of conductivity ranged from 736.85±8.13 μS×cm(-1) to 1048.90±67.53 μS×cm(-1) After 10 days, when the systems being assessed gained stability in terms of conductivity level, the values of conductivity were between 4.29±0.01 μS×cm(-1) and 33.56±0.04 μS×cm(-1). The pH values inreased significantly after FED. The resulting pH was between 6.92±0.07 and 8.21±0.07, while the initial values were between 3.42±0.23 μS×cm(-1) and 4.30±0.22 μS×cm(-1). CONCLUSIONS Conductivity and pH measurements performed during purification via FED provide important information on the composition of the resulting nanospheres, including the functional groups embedded in the structure of the polymer in the course of the synthesis, as well as the purity of the structures. The presence of a cross-linker and acidic comonomer in the poly-N-isopropyl acrylamide (polyNIPA) macromolecule may be confirmed by both the pH and the conductivity measurements.
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Affiliation(s)
- Witold Musiał
- Department of Physical Chemistry, Faculty of Pharmacy, Wroclaw Medical University, Poland
| | - Janusz Pluta
- Department of Pharmaceutical Technology, Faculty of Pharmacy, Wroclaw Medical University, Poland
| | - Tomasz Byrski
- Department of Pharmaceutical Technology, Faculty of Pharmacy, Wroclaw Medical University, Poland
| | - Julija V Valh
- Laboratory for Chemistry and Environmental Protection, Engineering Materials and Design, Faculty of Mechanical Engineering, University of Maribor, Slovenia
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193
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Hartanto Y, Yun S, Jin B, Dai S. Functionalized thermo-responsive microgels for high performance forward osmosis desalination. Water Res 2015; 70:385-393. [PMID: 25549211 DOI: 10.1016/j.watres.2014.12.023] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/17/2014] [Revised: 11/28/2014] [Accepted: 12/12/2014] [Indexed: 06/04/2023]
Abstract
Stimuli-responsive hydrogels were recently proposed for energy-saving forward osmosis (FO) process. However, their low water flux and dewatering ability for reuse make them less attractive for industrial desalination process. In this work, the co-polymer microgels of N-isopropylacrylamide and acrylic acid with different mixing ratios were synthesized using surfactant-free emulsion polymerization to produce submicron-size hydrogels with high surface area and fast swelling-deswelling response. The microgels were employed as draw agents in a laboratory scale FO desalination system. The microgel-based FO process performed a high water flux up to 23.8 LMH and high water recovery ability of 72.4%. In addition, we explored a new conductivity measurement method to online analyze water flux of the FO system. This on-line conductivity analysis approach appeared to be an accurate and efficient method for evaluating microgel-based FO desalination performance. Our experimental data revealed that the stimuli-responsive microgel was an efficient draw agent for FO desalination.
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Affiliation(s)
- Yusak Hartanto
- School of Chemical Engineering, The University of Adelaide, SA 5005, Australia
| | - Seonho Yun
- School of Chemical Engineering, The University of Adelaide, SA 5005, Australia
| | - Bo Jin
- School of Chemical Engineering, The University of Adelaide, SA 5005, Australia.
| | - Sheng Dai
- School of Chemical Engineering, The University of Adelaide, SA 5005, Australia.
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194
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Zhang RR, Zhang JF, Wang SQ, Cheng YL, Miao JY, Zhao BX. Novel pyrazoline-based fluorescent probe for detecting thiols and its application in cells. Spectrochim Acta A Mol Biomol Spectrosc 2015; 137:450-455. [PMID: 25238183 DOI: 10.1016/j.saa.2014.08.108] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/08/2014] [Revised: 08/19/2014] [Accepted: 08/24/2014] [Indexed: 06/03/2023]
Abstract
A new compound, N-(4-(1,5-diphenyl-4,5-dihydro-1H-pyrazol-3-yl)phenyl)-acrylamide (probe L), was designed and synthesized as a highly sensitive and selective fluorescent probe for recognizing and detecting thiol from other amino acids. On being mixed with thiol in buffered DMSO:HEPES=1:1 solution at pH 7.4, the probe exhibited the blue emission at 474 nm. This probe is very sensitive and displayed a linear fluorescence off-on response to thiol. The fluorescence emission of the probe is pH independent in the physiological pH range. Living cell imaging of HeLa cells confirmed its cell permeability and its ability to selectively detect thiol in cells. The structure of the probe was characterized by IR, NMR and HRMS spectroscopy analysis.
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Affiliation(s)
- Rong-Rong Zhang
- Institute of Organic Chemistry, School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, PR China
| | - Jin-Feng Zhang
- Institute of Developmental Biology, School of Life Science, Shandong University, Jinan 250100, PR China
| | - Sheng-Qing Wang
- Institute of Organic Chemistry, School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, PR China; Linyi City Engineering Consulting Institute, Shandong University, Linyi 276015, PR China
| | - Yan-Long Cheng
- Institute of Organic Chemistry, School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, PR China
| | - Jun-Ying Miao
- Institute of Developmental Biology, School of Life Science, Shandong University, Jinan 250100, PR China.
| | - Bao-Xiang Zhao
- Institute of Organic Chemistry, School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, PR China.
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195
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Xiao-Hong L, Hong-Ling C, Rui-Zhou Z, Xian-Zhou Z. Theoretical investigation on the non-linear optical properties, vibrational spectroscopy and frontier molecular orbital of (E)-2-cyano-3-(3-hydroxyphenyl)acrylamide molecule. Spectrochim Acta A Mol Biomol Spectrosc 2015; 137:321-327. [PMID: 25228040 DOI: 10.1016/j.saa.2014.08.036] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/07/2014] [Revised: 06/29/2014] [Accepted: 08/21/2014] [Indexed: 06/03/2023]
Abstract
The vibrational frequencies of (E)-2-cyano-3-(3-hydroxyphenyl)acrylamide (HB-CA) in the ground state have been calculated using density functional method (B3LYP) with B3LYP/6-311++G(d,p) basis set. The analysis of natural bond orbital was also performed. The IR spectra were obtained and interpreted by means of potential energies distributions (PEDs) using MOLVIB program. In addition, the results show that there exists C-H⋯O hydrogen bond in the title compound, which is confirmed by the natural bond orbital analysis. The predicted NLO properties show that the title compound is a good candidate as nonlinear optical material. The analysis of frontier molecular orbitals shows that HB-CA has high excitation energies, good stability and high chemical hardness. The analysis of MEP map shows the negative and the positive potential sites.
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Affiliation(s)
- Li Xiao-Hong
- College of Physics and Engineering, Henan University of Science and Technology, Luoyang 471003, China; Luoyang Key Laboratory of Photoelectric Functional Materials, Henan University of Science and Technology, Luoyang 471023, China.
| | - Cui Hong-Ling
- College of Physics and Engineering, Henan University of Science and Technology, Luoyang 471003, China
| | - Zhang Rui-Zhou
- College of Physics and Engineering, Henan University of Science and Technology, Luoyang 471003, China
| | - Zhang Xian-Zhou
- College of Physics and Information Engineering, Henan Normal University, Xinxiang 453007, China
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196
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Natan M, Gutman O, Lavi R, Margel S, Banin E. Killing mechanism of stable N-halamine cross-linked polymethacrylamide nanoparticles that selectively target bacteria. ACS Nano 2015; 9:1175-1188. [PMID: 25602279 DOI: 10.1021/nn507168x] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Increased resistance of bacteria to disinfection and antimicrobial treatment poses a serious public health threat worldwide. This has prompted the search for agents that can inhibit both bacterial growth and withstand harsh conditions (e.g., high organic loads). In the current study, N-halamine-derivatized cross-linked polymethacrylamide nanoparticles (NPs) were synthesized by copolymerization of the monomer methacrylamide (MAA) and the cross-linker monomer N,N-methylenebis(acrylamide) (MBAA) and were subsequently loaded with oxidative chlorine using sodium hypochlorite (NaOCl). The chlorinated NPs demonstrated remarkable stability and durability to organic reagents and to repetitive bacterial loading cycles as compared with the common disinfectant NaOCl (bleach), which was extremely labile under these conditions. The antibacterial mechanism of the cross-linked P(MAA-MBAA)-Cl NPs was found to involve generation of reactive oxygen species (ROS) only upon exposure to organic media. Importantly, ROS were not generated upon suspension in water, revealing that the mode of action is target-specific. Further, a unique and specific interaction of the chlorinated NPs with Staphylococcus aureus was discovered, whereby these microorganisms were all specifically targeted and marked for destruction. This bacterial encircling was achieved without using a targeting module (e.g., an antibody or a ligand) and represents a highly beneficial, natural property of the P(MAA-MBAA)-Cl nanostructures. Our findings provide insights into the mechanism of action of P(MAA-MBAA)-Cl NPs and demonstrate the superior efficacy of the NPs over bleach (i.e., stability, specificity, and targeting). This work underscores the potential of developing sustainable P(MAA-MBAA)-Cl NP-based devices for inhibiting bacterial colonization and growth.
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Affiliation(s)
- Michal Natan
- The Mina and Everard Goodman Faculty of Life Sciences, ‡The Department of Chemistry, and §The Institute for Advanced Materials and Nanotechnology, Bar-Ilan University , Ramat-Gan 52900, Israel
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197
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Han DM, Zhang QM, Serpe MJ. Poly (N-isopropylacrylamide)-co-(acrylic acid) microgel/Ag nanoparticle hybrids for the colorimetric sensing of H2O2. Nanoscale 2015; 7:2784-2789. [PMID: 25584531 DOI: 10.1039/c4nr06093h] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Poly (N-isopropylacrylamide)-co-(acrylic acid) (pNIPAm-co-AAc) microgels composed of Ag nanoparticles (Ag NPs) have been synthesized and employed for the colorimetric sensing of H2O2. Each pNIPAm-co-AAc microgel, which exhibited a diameter of ∼800 nm, contained multiple Ag NPs (diameter of ∼5 nm), and solutions of these hybrid materials showed a UV-vis absorption band at ∼400 nm. This is due to the excitation of the Ag NP surface plasmon. We go on to show that the intensity of this absorption band is dependent on the concentration of H2O2 in solution. Specifically, in the presence of H2O2 the magnitude of the absorption peak dramatically decreases in a linear fashion over the concentration range of 0.30 to 3.00 μM H2O2 (r(2) = 0.9918). We go on to show that the response is selective for H2O2 and can still function in complex mixtures, e.g., we showed that the response is still robust in milk samples. While Ag NPs themselves can exhibit similar responses, this system has many benefits including sample processing and long term stability - i.e., Ag NPs are destabilized in solutions of a certain pH, and aggregate readily. Our microgel/Ag NP hybrids have been shown to be extremely stable and are easily purified prior to use by simple centrifugation/washing protocols. This system is simple and straightforward to use, is low cost, and can be used in complex media, which makes it practical for analyzing complex biological and environmental samples.
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Affiliation(s)
- De-Man Han
- Department of Chemistry, University of Alberta, Edmonton, Alberta, Canada T6G 2G2.
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198
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Chen BY, Kuo CC, Huang YS, Lu ST, Liang FC, Jiang DH. Novel highly selective and reversible chemosensors based on dual-ratiometric fluorescent electrospun nanofibers with pH- and Fe(3+)-modulated multicolor fluorescence emission. ACS Appl Mater Interfaces 2015; 7:2797-2808. [PMID: 25585636 DOI: 10.1021/am508029x] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Novel dual-ratiometric fluorescent electrospun (ES) nanofibers featuring high sensitivity for pH and ferric ion (Fe(3+)) were prepared using binary blends of poly(2-hydroxyethyl methacrylate-co-N-methylolacrylamide-co-nitrobenzoxadiazolyl derivative) (poly(HEMA-co-NMA-co-NBD)) and a spirolactam rhodamine derivative (SRhBOH) by employing a single-capillary spinneret. The HEMA, NMA, and NBD moieties were designed to exhibit hydrophilic properties, chemical cross-linking, and fluorescence (fluorescence resonance energy transfer (FRET) donor), respectively. The fluorescence emission of SRhBOH was highly selective for pH and Fe(3+); when SRhBOH detected acidic media and Fe(3+), the spirocyclic form of SRhBOH, which is nonfluorescent, was transformed into the opened cyclic form and exhibited strong fluorescence emission. The emission colors of ES nanofibers in acidic or Fe(3+) aqueous solutions changed from green to red because of FRET from NBD (donor) to SRhBOH (acceptor). The off/on switching of the FRET process was modulated by adjusting the SRhBOH blending ratio, pH, and Fe(3+) concentration. Poly(HEMA-co-NMA-co-NBD) ES fibers blended with 20% SRhBOH showed high sensitivity in sensing Fe(3+) and pH because of the substantial 57 nm red shift in emission as well as substantial reversible dual photoluminescence. The prepared FRET-based dual-ratiometric fluorescent ES nanofibrous membranes can be used as "naked eye" sensors and have potential for application in multifunctional environment sensing devices.
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Affiliation(s)
- Bo-Yu Chen
- Institute of Organic and Polymeric Materials, National Taipei University of Technology , 10608 Taipei, Taiwan
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199
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Saito Y, Yabu H. Bio-inspired low frictional surfaces having micro-dimple arrays prepared with honeycomb patterned porous films as wet etching masks. Langmuir 2015; 31:959-963. [PMID: 25547931 DOI: 10.1021/la503883m] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Some kinds of snakes have micro-dimple arrays on their skins and show low frictional properties. Cost-effective and simple preparation methods of surfaces having micro-dimple arrays without burrs have been required. In this study, micro-dimple arrays were successfully prepared on aluminum plates and pipes by using honeycomb patterned porous films as wet etching masks. Resulting surfaces having 5 and 8 μm dimple diameters show low frictional coefficients compared with polished surfaces at a fluid lubrication regime.
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Affiliation(s)
- Y Saito
- Graduate School of Engineering and ‡Institute of Multidisciplinary Research for Advanced Materials (IMRAM), Tohoku University , 2-1-1, Katahira, Aoba-ku, Sendai, Miyagi, Japan
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200
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Slegerova J, Hajek M, Rehor I, Sedlak F, Stursa J, Hruby M, Cigler P. Designing the nanobiointerface of fluorescent nanodiamonds: highly selective targeting of glioma cancer cells. Nanoscale 2015; 7:415-20. [PMID: 25132312 DOI: 10.1039/c4nr02776k] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Core-shell nanoparticles based on fluorescent nanodiamonds coated with a biocompatible N-(2-hydroxypropyl)methacrylamide copolymer shell were developed for background-free near-infrared imaging of cancer cells. The particles showed excellent colloidal stability in buffers and culture media. After conjugation with a cyclic RGD peptide they selectively targeted integrin αvβ3 receptors on glioblastoma cells with high internalization efficacy.
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Affiliation(s)
- Jitka Slegerova
- Institute of Organic Chemistry and Biochemistry AS CR, v.v.i., Flemingovo nam. 2, 166 10, Prague 6, Czech Republic.
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