1
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Mahdieh A, Motasadizadeh H, Maghsoudian S, Sabzevari A, Khalili F, Yeganeh H, Nyström B. Novel polyurethane-based ionene nanoparticles electrostatically stabilized with hyaluronic acid for effective gene therapy. Colloids Surf B Biointerfaces 2024; 236:113802. [PMID: 38382225 DOI: 10.1016/j.colsurfb.2024.113802] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [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: 10/18/2023] [Revised: 01/29/2024] [Accepted: 02/13/2024] [Indexed: 02/23/2024]
Abstract
Gene therapy is considered to be a valuable strategy for effective cancer treatment. However, the development of effective delivery systems that can specifically deliver gene materials, such as siRNA to tumor tissues plays a critical role in cancer therapy. In the present study, we have developed a novel complex that is based on an electrostatic interaction between cationic polyurethane ionene (CPUI) nanoparticles and an anti-signal transducer and activator of transcription 3 (STAT3) siRNA. For active targeting, hyaluronic acid (HA) was used to coat the complexes, which significantly reduced the cytotoxicity of the blank nanocarriers while demonstrating high transport efficiency of the siRNA via the CD44-mediated endocytosis pathway in MCF-7 breast cancer cells. The targeted nanocarriers (HA/CPUI/siRNA) showed significantly higher cellular internalization in flow cytometry and confocal microscopy compared with the non-targeted system (CPUI/siRNA). In addition, the incorporation of HA on the surface of the complexes resulted in significantly greater suppression of the STAT3 gene compared to the corresponding non-targeted formulation. Whole-body fluorescence images showed more significant tumor accumulation of the targeted nanocarriers in 4T1 breast tumor-bearing mice. Therefore, HA/CPUI/siRNA nanocarriers are an interesting option for the siRNA-targeted treatment of breast cancer cells.
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Affiliation(s)
- Athar Mahdieh
- Department of Pharmacy, Section for Pharmaceutics and Social Pharmacy, University of Oslo, Oslo, Norway
| | - Hamidreza Motasadizadeh
- Dental Research Center, Dentistry Research Institute, Tehran University of Medical Sciences, Tehran, Iran
| | - Samane Maghsoudian
- Department of Pharmaceutical Nanotechnology, Faculty of Pharmacy, Tehran University of Medical Sciences, Tehran, Iran
| | - Alireza Sabzevari
- Polymer Faculty, Biomedical Engineering Department, Meybod University, Meybod, Yazd, Iran; Polymer Engineering Department, Faculty of Chemical Engineering, Tarbiat Modares University, Tehran, Iran
| | - Fereshte Khalili
- Department of Pharmaceutical Nanotechnology, Faculty of Pharmacy, Tehran University of Medical Sciences, Tehran, Iran
| | - Hamid Yeganeh
- Iran Polymer and Petrochemical Institute, Tehran, Iran
| | - Bo Nyström
- Department of Chemistry, University of Oslo, Oslo, Norway.
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2
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Mahdieh A, Yeganeh H, Motasadizadeh H, Nekoueifard E, Maghsoudian S, Hossein Ghahremani M, Nyström B, Dinarvand R. Waterborne polyurethane magnetic nanomicelles with magnetically governed functions for breast cancer therapy. Int J Pharm 2023; 645:123356. [PMID: 37661033 DOI: 10.1016/j.ijpharm.2023.123356] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2023] [Revised: 08/22/2023] [Accepted: 08/26/2023] [Indexed: 09/05/2023]
Abstract
Drug delivery strategies aim to maximize a drug's therapeutic efficiency by increasing the drug's concentration at the target site while minimizing delivery to off-target tissues. There is a great deal of interest in using magnetic nanoparticles in combination with applied magnetic fields to selectively control drug accumulation and release in target tissue while minimizing effects on other tissues. In this study, a magnetic targeted drug delivery system based on waterborne polyurethane nanomicelles was prepared by encapsulating hydrophobic doxorubicin (DOX, model drug) and hydrophobic oleic acid-superparamagnetic nanoparticles (SPION-OA) into the hydrophobic core of waterborne polyurethane micelles (CPUM) using the solvent evaporation method. The prepared drug-loaded magnetomicelles (CPUM-DOX-SPION) had a spherical shape with an average diameter of 158 nm. The magnetomicelles showed superparamagnetic properties with excellent magnetic resonance imaging (MRI) contrast effects and T2 relaxation in vitro. In the absence and presence of a magnetic field, the cytocompatibility and cellular uptake of the samples were assessed by MTT assay and flow cytometry, respectively, and the cells were imaged with a confocal microscope. Application of the magnetic field increased cellular cytotoxicity and cellular uptake in association with improved DOX delivery. In addition, the in vivo study of tumor volume showed that tumor growth of the mice group treated with CPUM-DOX-SPION in the presence of an external magnetic field was significantly retarded, with no apparent loss of body weight, compared with the same magnetomicelles in the absence of the magnetic field and with free DOX at the same dose. Moreover, the in vivo MRI experiment indicated the potential of these magnetomicelles as a probe in MRI diagnosis for tumor targeting, and the results showed that magnetically guided delivery of CPUM-SPION magnetomicelles into tumors could significantly improve the targeting efficacy. All the results suggest that the prepared novel magnetomicelles will be promising theranostic systems for effective magnetically guided delivery of chemotherapeutic agents and image-guided personalized medicine.
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Affiliation(s)
- Athar Mahdieh
- Department of Pharmaceutical Nanotechnology, Faculty of Pharmacy, Tehran University of Medical Sciences, Tehran 14174, Iran; Department of Pharmacy, Section for Pharmaceutics and Social Pharmacy, University of Oslo, N-0316, Oslo, Norway
| | - Hamid Yeganeh
- Iran Polymer and Petrochemical Institute, P.O. Box: 14965-115, Tehran, Iran.
| | - Hamidreza Motasadizadeh
- Department of Pharmaceutical Nanotechnology, Faculty of Pharmacy, Tehran University of Medical Sciences, Tehran 14174, Iran; Nanotechnology Research Centre, Faculty of Pharmacy, Tehran University of Medical Sciences, Tehran 14174, Iran
| | - Effat Nekoueifard
- Department of Pharmaceutical Nanotechnology, Faculty of Pharmacy, Tehran University of Medical Sciences, Tehran 14174, Iran; Department of Cell Engineering, Cell Science Research Center, Royan Institute for Stem Cell Biology and Technology, ACECR, Tehran, Iran
| | - Samane Maghsoudian
- Department of Pharmaceutical Nanotechnology, Faculty of Pharmacy, Tehran University of Medical Sciences, Tehran 14174, Iran; Nanotechnology Research Centre, Faculty of Pharmacy, Tehran University of Medical Sciences, Tehran 14174, Iran
| | - Mohammad Hossein Ghahremani
- Department of Toxicology and Pharmacology, Faculty of Pharmacy, Tehran University of Medical Sciences, Tehran, Iran
| | - Bo Nyström
- Department of Chemistry, University of Oslo, P.O. Box 1033, Blindern N-0315, Oslo, Norway
| | - Rassoul Dinarvand
- Department of Pharmaceutical Nanotechnology, Faculty of Pharmacy, Tehran University of Medical Sciences, Tehran 14174, Iran; Nanotechnology Research Centre, Faculty of Pharmacy, Tehran University of Medical Sciences, Tehran 14174, Iran; Leicester School of Pharmacy, De Montfort University, Leicester, United Kingdom.
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3
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Gjerde N, Del Giudice A, Zhu K, Knudsen KD, Galantini L, Schillén K, Nyström B. Synthesis and Characterization of a Thermoresponsive Copolymer with an LCST-UCST-like Behavior and Exhibiting Crystallization. ACS Omega 2023; 8:31145-31154. [PMID: 37663484 PMCID: PMC10468772 DOI: 10.1021/acsomega.3c03162] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/08/2023] [Accepted: 08/03/2023] [Indexed: 09/05/2023]
Abstract
In this work, the diblock copolymer methoxy-poly(ethylene glycol)-block-poly(ε-caprolactone) (MPEG-b-PCL) was synthesized with a block composition that allows this polymer in aqueous media to possess both an upper critical solution temperature (UCST) and a lower critical solution temperature (LCST) over a limited temperature interval. The value of the UCST, associated with crystallization of the PCL-block, depended on heating (H) or cooling (C) of the sample and was found to be CPUCSTH = 32 °C and CPUCSTC = 23 °C, respectively. The LCST was not affected by the heating or cooling scans; assumed a value of 52 °C (CPLCSTH = CPLCSTC). At intermediate temperatures (e.g., 45 °C), dynamic light scattering (DLS), small-angle X-ray scattering (SAXS), and cryogenic transmission electron microscopy (cryo-TEM) showed that the solution consisted of a large population of spherical core-shell particles and some self-assembled rodlike objects. At low temperatures (below 32 °C), differential scanning calorimetry (DSC) and wide-angle X-ray scattering (WAXS) in combination with SAXS disclosed the formation of crystals with a cylindrical core-shell structure. Cryo-TEM supported a thread-like appearance of the self-assembled polymer chains. At temperatures above 52 °C, incipient phase separation took place and large aggregation complexes of amorphous morphology were formed. This work provides insight into the intricate interplay between UCST and LCST and the type of structures formed at these conditions in aqueous solutions of MPEG-b-PCL diblock copolymers.
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Affiliation(s)
- Natalie
Solfrid Gjerde
- Department
of Chemistry, “Sapienza” University
of Rome, P.O. Box 34-Roma 62, Piazzale A. Moro 5, I-00185 Roma, Italy
| | - Alessandra Del Giudice
- Department
of Chemistry, “Sapienza” University
of Rome, P.O. Box 34-Roma 62, Piazzale A. Moro 5, I-00185 Roma, Italy
| | - Kaizheng Zhu
- Faculty
of Engineering, Østfold University
College, P.O. Box 700, 1757 Halden, Norway
| | | | - Luciano Galantini
- Department
of Chemistry, “Sapienza” University
of Rome, P.O. Box 34-Roma 62, Piazzale A. Moro 5, I-00185 Roma, Italy
| | - Karin Schillén
- Division
of Physical Chemistry, Department of Chemistry, Lund University, P.O. Box 124, SE-221 00 Lund, Sweden
| | - Bo Nyström
- Department
of Chemistry, University of Oslo, P.O. Box 1033, Blindern, N-0315 Oslo, Norway
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4
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Mahdieh A, Yeganeh H, Sande SA, Nyström B. Design of novel polyurethane-based ionene nanocarriers for cancer therapy: Synthesis, in-vitro, and in-vivo studies. Int J Pharm 2023; 635:122768. [PMID: 36841369 DOI: 10.1016/j.ijpharm.2023.122768] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2022] [Revised: 02/01/2023] [Accepted: 02/19/2023] [Indexed: 02/26/2023]
Abstract
New strategies for constructing versatile nanocarriers are needed for cancer therapy to overcome the multiple challenges of targeted delivery. This work explores the advantages of polyurethane with main-chain quaternary ammonium salt moieties (ionene) as a novel carrier for targeted drug delivery. We have developed a novel cationic soybean oil-based polyurethane ionene nanocarrier (CPUI) that can act as an effective anticancer agent and efficiently deliver the anticancer drug 5-fluorouracil (5FU). We also report a potential anticancer drug delivery system targeting the folate receptor. In vitro experiments with blank CPUI carriers on the 4T1 (mouse breast cancer cell line) and the NIH-3T3 (mouse fibroblast cell line) revealed high cytotoxicity for the cancer cells but only low cytotoxicity for the normal fibroblast cells. The CPUI nanoparticles were readily loaded with 5FU (5FU-CPUI) in water using electrostatic interactions between the cationic quaternary ammonium groups of ionene and the anionic 5FU. The in vivo study in mice with tumors showed that the blank CPUI carriers significantly inhibited tumor growth, even more than the free drug (5FU). The inhibitory effect on tumor growth was slightly enhanced when the carriers were loaded with 5FU. The prepared nanoparticles had a high loading capacity of 41.8 %. Further enhancement of the inhibitory effect was observed when folic acid (FA) was added as a targeting moiety to the system via ion exchange with the bromine counterion of the quaternary ammonium moieties. The results suggest that the efficacy of FA-CPUI-5FU nanoparticles as vehicles for drug delivery can be enhanced via folate receptor (FR) mediated endocytosis in 4T1 cells and these novel nanocarriers may provide a potential platform for effective targeted drug delivery to tumor tissue and breast cancer therapy in the clinic.
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Affiliation(s)
- Athar Mahdieh
- Department of Pharmacy, Section for Pharmaceutics and Social Pharmacy, University of Oslo, Oslo, Norway
| | - Hamid Yeganeh
- Iran Polymer and Petrochemical Institute, Tehran, Iran.
| | - Sverre Arne Sande
- Department of Pharmacy, Section for Pharmaceutics and Social Pharmacy, University of Oslo, Oslo, Norway
| | - Bo Nyström
- Department of Chemistry, University of Oslo, Oslo, Norway.
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5
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Tan J, Gjerde N, Del Giudice A, Knudsen KD, Galantini L, Du G, Schillén K, Sande SA, Nyström B. Interactions in Aqueous Mixtures of Cationic Hydroxyethyl Cellulose and Different Anionic Bile Salts. J Agric Food Chem 2023; 71:3732-3741. [PMID: 36791398 PMCID: PMC9983013 DOI: 10.1021/acs.jafc.3c00076] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/04/2023] [Accepted: 02/04/2023] [Indexed: 06/18/2023]
Abstract
It is known that the reduction of blood cholesterol can be accomplished through foods containing a large number of dietary fibers; this process is partially related to the binding of bile salt to fibers. To gain new insights into the interactions between dietary fibers and bile salts, this study investigates the interactions between cationic hydroxyethyl cellulose (catHEC) and sodium deoxycholate (NaDC) or sodium cholate (NaC), which have a similar structure. Turbidity measurements reveal strong interactions between catHEC and NaDC, and under some conditions, macroscopic phase separation occurs. In contrast, the interactions with NaC are weak. At a catHEC concentration of 2 wt %, incipient phase separation is approached at concentrations of NaC and NaDC of 32.5 and 19.3 mM, respectively. The rheological results show strong interactions and a prominent viscosification effect for the catHEC/NaDC system but only moderate interactions for the catHEC/NaC system. Both cryogenic transmission electron microscopy and small-angle X-ray scattering results display fundamental structural differences between the two systems, which may explain the stronger interactions in the presence of NaDC. The surmise is that the extended structures formed in the presence of NaDC can easily form connections and entanglements in the network.
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Affiliation(s)
- Julia
Jianwei Tan
- School
of Pharmacy, Department of Pharmaceutics, University of Oslo, P.O. Box 1068, Blindern, N-0316 Oslo, Norway
| | - Natalie Gjerde
- Department
of Chemistry, ‘‘Sapienza’’
University of Rome, P.O. Box 34, Roma 62, Piazzale A. Moro 5, I-00185 Roma, Italy
| | - Alessandra Del Giudice
- Department
of Chemistry, ‘‘Sapienza’’
University of Rome, P.O. Box 34, Roma 62, Piazzale A. Moro 5, I-00185 Roma, Italy
| | | | - Luciano Galantini
- Department
of Chemistry, ‘‘Sapienza’’
University of Rome, P.O. Box 34, Roma 62, Piazzale A. Moro 5, I-00185 Roma, Italy
| | - Guanqun Du
- Division
of Physical Chemistry, Department of Chemistry, Lund University, P.O. Box 124, SE-221 00 Lund, Sweden
| | - Karin Schillén
- Division
of Physical Chemistry, Department of Chemistry, Lund University, P.O. Box 124, SE-221 00 Lund, Sweden
| | - Sverre Arne Sande
- School
of Pharmacy, Department of Pharmaceutics, University of Oslo, P.O. Box 1068, Blindern, N-0316 Oslo, Norway
| | - Bo Nyström
- Department
of Chemistry, University of Oslo, P.O. Box 1033, Blindern, N-0315 Oslo, Norway
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6
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Nazemoroaya Z, Sarafbidabad M, Mahdieh A, Zeini D, Nyström B. Use of Saponinosomes from Ziziphus spina-christi as Anticancer Drug Carriers. ACS Omega 2022; 7:28421-28433. [PMID: 35990496 PMCID: PMC9386697 DOI: 10.1021/acsomega.2c03109] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/18/2022] [Accepted: 07/22/2022] [Indexed: 05/06/2023]
Abstract
Saponins are plant glycosides with different structures and biological activities, such as anticancer effects. Ziziphus spina-christi is a plant rich in saponin, and this compound is used to treat malignant melanoma in the present study. Nanophytosomes can be used as an advantageous nanodrug delivery system for plant extracts. The aim of this work is to use the saponin-rich fraction (SRF) from Z. spina-christi and prepare SRF-loaded nanophytosomes (saponinosomes) and observe the in vitro and in vivo effects of these carriers. First, the SRF was obtained from Z. spina-christi by a solvent-solvent fractionation method. Then, Fourier transform infrared (FTIR) analyses were performed to confirm the presence of saponins in the extracted material. Subsequently, the saponinosomes were prepared by the solvent injection method (ether injection method) using a 1:1:1 ratio of lecithin/cholesterol/SRF in the mixture. Characterization of the prepared saponinosomes was performed by FTIR, dynamic light scattering (DLS), field-emission scanning electron microscopy (FE-SEM), and atomic force microscopy (AFM) analyses. In addition, a UV-vis spectrophotometer was used to determine the entrapment efficiency (EE) and in vitro release of the SRF. Finally, cell cytotoxicity of the different formulations was evaluated using a 3-[4,5-dimethylthiazol-2-yl]-2,5-diphenyl tetrazolium bromide (MTT) assay on both mouse melanoma cells (B16F10) and fibroblasts (L929). Using DLS, AFM, and FE-SEM analyses, the particle size was determined to be 58 ± 6 nm with a zeta potential of -32 ± 2 mV. The calculated EE was 85 ± 3%. The results of the in vitro release profile showed that 68.2% of the SRF was released from the saponinosome after 48 h. The results of the MTT assay showed that the SRF and saponinosomes have high toxicity on B16F10 melanoma cells, but saponinosomes showed a significant decrease in cytotoxicity on L929 fibroblast cells compared with that of the SRF. Our results indicate that the SRF from Z. spina-christi has anticancer activity, and the saponinosomes prepared in this work can control tumor growth, improve therapeutic efficacy, and reduce the side effects of saponins.
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Affiliation(s)
- Zahra Nazemoroaya
- Student
Research Committee, School of Pharmacy, Shahid Beheshti University of Medical Sciences, 19839-63113 Tehran, Iran
| | - Mohsen Sarafbidabad
- Department
of Biomedical Engineering, Faculty of Engineering, University of Isfahan, 81746-73441 Isfahan, Iran
| | - Athar Mahdieh
- School
of Pharmacy, Department of Pharmaceutics, University of Oslo, P.O. Box 1068,
Blindern, N-0316 Oslo, Norway
- Department
of Chemistry, University of Oslo, P.O. Box 1033, Blindern, N-0315 Oslo, Norway
| | - Darya Zeini
- Department
of Chemistry, University of Oslo, P.O. Box 1033, Blindern, N-0315 Oslo, Norway
- Laboratory
of Neural Development and Optical Recording (NDEVOR), Department of
Molecular Medicine, Institute of Basic Medical Sciences, University of Oslo, P.O.
Box 1103, N-0317 Oslo, Norway
| | - Bo Nyström
- Department
of Chemistry, University of Oslo, P.O. Box 1033, Blindern, N-0315 Oslo, Norway
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7
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Du G, Belić D, Del Giudice A, Alfredsson V, Carnerup AM, Zhu K, Nyström B, Wang Y, Galantini L, Schillén K. Condensed Supramolecular Helices: The Twisted Sisters of DNA. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202113279] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Guanqun Du
- Division of Physical Chemistry Department of Chemistry Lund University P.O. Box 124 22100 Lund Sweden
| | - Domagoj Belić
- Division of Physical Chemistry Department of Chemistry Lund University P.O. Box 124 22100 Lund Sweden
- Department of Physics Josip Juraj Strossmayer University of Osijek 31000 Osijek Croatia
| | - Alessandra Del Giudice
- Department of Chemistry Sapienza University of Rome P.O. Box 34-Roma 62, Piazzale A. Moro 5 00185 Roma Italy
| | - Viveka Alfredsson
- Division of Physical Chemistry Department of Chemistry Lund University P.O. Box 124 22100 Lund Sweden
| | - Anna M. Carnerup
- Division of Physical Chemistry Department of Chemistry Lund University P.O. Box 124 22100 Lund Sweden
| | - Kaizheng Zhu
- Department of Chemistry University of Oslo P.O. Box 1033, Blindern 0315 Oslo Norway
| | - Bo Nyström
- Department of Chemistry University of Oslo P.O. Box 1033, Blindern 0315 Oslo Norway
| | - Yilin Wang
- Key Laboratory of Colloid and Interface Science Beijing National Laboratory for Molecular Sciences Institute of Chemistry Chinese Academy of Sciences Beijing 100190 China
| | - Luciano Galantini
- Department of Chemistry Sapienza University of Rome P.O. Box 34-Roma 62, Piazzale A. Moro 5 00185 Roma Italy
| | - Karin Schillén
- Division of Physical Chemistry Department of Chemistry Lund University P.O. Box 124 22100 Lund Sweden
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Du G, Belić D, Del Giudice A, Alfredsson V, Carnerup AM, Zhu K, Nyström B, Wang Y, Galantini L, Schillén K. Condensed Supramolecular Helices: The Twisted Sisters of DNA. Angew Chem Int Ed Engl 2021; 61:e202113279. [PMID: 34757695 PMCID: PMC9300030 DOI: 10.1002/anie.202113279] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2021] [Indexed: 11/07/2022]
Abstract
Condensation of DNA helices into hexagonally packed bundles and toroids represents an intriguing example of functional organization of biological macromolecules at the nanoscale. The condensation models are based on the unique polyelectrolyte features of DNA, however here we could reproduce a DNA‐like condensation with supramolecular helices of small chiral molecules, thereby demonstrating that it is a more general phenomenon. We show that the bile salt sodium deoxycholate can form supramolecular helices upon interaction with oppositely charged polyelectrolytes of homopolymer or block copolymers. At higher order, a controlled hexagonal packing of the helices into DNA‐like bundles and toroids could be accomplished. The results disclose unknown similarities between covalent and supramolecular non‐covalent helical polyelectrolytes, which inspire visionary ideas of constructing supramolecular versions of biological macromolecules. As drug nanocarriers the polymer–bile salt superstructures would get advantage of a complex chirality at molecular and supramolecular levels, whose effect on the nanocarrier assisted drug efficiency is a still unexplored fascinating issue.
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Affiliation(s)
- Guanqun Du
- Lund University: Lunds Universitet, Division of Physical Chemistry, Department of Chemistry, P.O. Box 124, SE-22100, Lund, SWEDEN
| | - Domagoj Belić
- Lund University: Lunds Universitet, Division of Physical Chemistry, Department of Chemistry, P.O. Box 124, SE-22100, Lund, SWEDEN
| | - Alessandra Del Giudice
- Sapienza University of Rome: Universita degli Studi di Roma La Sapienza, Department of Chemistry, Piazzale A. Moro 5, I-00185, Rome, ITALY
| | - Viveka Alfredsson
- Lund University: Lunds Universitet, Department of Chemistry, P.O. Box 124, SE-22100, Lund, SWEDEN
| | - Anna M Carnerup
- Lund University: Lunds Universitet, Division of Physical Chemistry, Department of Chemistry, P.O. Box 124, SE-22100, Lund, SWEDEN
| | - Kaizheng Zhu
- University of Oslo: Universitetet i Oslo, Deparment of Chemistry, P.O. Box 1033, N-0315, Oslo, NORWAY
| | - Bo Nyström
- University of Oslo: Universitetet i Oslo, Department of Chemistry, P.O. Box 1033, N-0315, Oslo, NORWAY
| | - Yilin Wang
- Institute of Chemistry Chinese Academy of Sciences, Key Laboratory of Colloid and Interface Science, Beijing National Laboratory for Molecular Science, 100190, Beijing, CHINA
| | - Luciano Galantini
- Sapienza University of Rome: Universita degli Studi di Roma La Sapienza, Department of Chemistry, Piazzale A. Moro 5, I-00185, Rome, ITALY
| | - Karin Schillén
- Lund University, Division of Physical Chemistry, Department of Chemistry, Center for Chemistry and Chemical Engineering, P.O. Box 124, SE-221 00, Lund, SWEDEN
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9
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Carmona P, Tasici AM, Sande SA, Knudsen KD, Nyström B. Glyceraldehyde as an Efficient Chemical Crosslinker Agent for the Formation of Chitosan Hydrogels. Gels 2021; 7:186. [PMID: 34842656 PMCID: PMC8628775 DOI: 10.3390/gels7040186] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2021] [Revised: 10/20/2021] [Accepted: 10/26/2021] [Indexed: 12/05/2022] Open
Abstract
The rheological changes that occur during the chemical gelation of semidilute solutions of chitosan in the presence of the low-toxicity agent glyceraldehyde (GCA) are presented and discussed in detail. The entanglement concentration for chitosan solutions was found to be approximately 0.2 wt.% and the rheological experiments were carried out on 1 wt.% chitosan solutions with various amounts of GCA at different temperatures (25 °C and 40 °C) and pH values (4.8 and 5.8). High crosslinker concentration, as well as elevated temperature and pH close to the pKa value (pH ≈ 6.3-7) of chitosan are three parameters that all accelerate the gelation process. These conditions also promote a faster solid-like response of the gel-network in the post-gel region after long curing times. The mesh size of the gel-network after a very long (18 h) curing time was found to contract with increasing level of crosslinker addition and elevated temperature. The gelation of chitosan in the presence of other chemical crosslinker agents (glutaraldehyde and genipin) is discussed and a comparison with GCA is made. Small angle neutron scattering (SANS) results reveal structural changes between chitosan solutions, incipient gels, and mature gels.
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Affiliation(s)
- Pierre Carmona
- Department of Chemistry, University of Oslo, N-0315 Oslo, Norway;
- Department of Physics, Division of Nano-and BioPhysics, Chalmers University of Technology, Fysikgränd 3, 412 96 Gothenburg, Sweden
| | - Anca M. Tasici
- Department of Pharmacy, Section for Pharmaceutics and Social Pharmacy, University of Oslo, N-0316 Oslo, Norway; (A.M.T.); (S.A.S.)
| | - Sverre A. Sande
- Department of Pharmacy, Section for Pharmaceutics and Social Pharmacy, University of Oslo, N-0316 Oslo, Norway; (A.M.T.); (S.A.S.)
| | | | - Bo Nyström
- Department of Chemistry, University of Oslo, N-0315 Oslo, Norway;
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10
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Zeini D, Glover JC, Knudsen KD, Nyström B. Influence of Lysine and TRITC Conjugation on the Size and Structure of Dextran Nanoconjugates with Potential for Biomolecule Delivery to Neurons. ACS Appl Bio Mater 2021; 4:6832-6842. [DOI: 10.1021/acsabm.1c00544] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Darya Zeini
- Department of Chemistry, University of Oslo, Blindern, P.O.
Box 1033, Oslo N-0315, Norway
- Laboratory of Neural Development and Optical Recording (NDEVOR), Department of Molecular Medicine, Institute of Basic Medical Sciences, University of Oslo, P.O.
Box 1103, Oslo N-0317, Norway
| | - Joel C. Glover
- Laboratory of Neural Development and Optical Recording (NDEVOR), Department of Molecular Medicine, Institute of Basic Medical Sciences, University of Oslo, P.O.
Box 1103, Oslo N-0317, Norway
- Norwegian Center for Stem Cell Research, Oslo University Hospital, Oslo N-0317, Norway
| | | | - Bo Nyström
- Department of Chemistry, University of Oslo, Blindern, P.O.
Box 1033, Oslo N-0315, Norway
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Nasrollah SAS, Najmoddin N, Mohammadi M, Fayyaz A, Nyström B. Three dimensional polyurethane/ hydroxyapatite bioactive scaffolds: The role of hydroxyapatite on pore generation. J Appl Polym Sci 2020. [DOI: 10.1002/app.50017] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Seyyed Ahmad Seyyed Nasrollah
- Department of Biomedical Engineering, Science and research branch Islamic Azad University Tehran Iran
- Department of Biomedical Engineering Amirkabir University of Technology Tehran Iran
| | - Najmeh Najmoddin
- Department of Biomedical Engineering, Science and research branch Islamic Azad University Tehran Iran
| | - Mohsen Mohammadi
- Department of Polymer Engineering, Faculty of Engineering Qom University of Technology Qom Iran
| | - Abdolali Fayyaz
- Department of Materials Engineering, Science and research branch Islamic Azad University Tehran Iran
| | - Bo Nyström
- Department of Chemistry University of Oslo Oslo Norway
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12
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Du G, Del Giudice A, Alfredsson V, Carnerup AM, Pavel NV, Loh W, Masci G, Nyström B, Galantini L, Schillén K. Effect of temperature on the association behavior in aqueous mixtures of an oppositely charged amphiphilic block copolymer and bile salt. POLYMER 2020. [DOI: 10.1016/j.polymer.2020.122871] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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13
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Zhu K, Pamies R, Al‐Manasir N, Ginés Hernández Cifre J, García de la Torre J, Nyström B, Kjøniksen A. The Effect of Number of Arms on the Aggregation Behavior of Thermoresponsive Poly(N-isopropylacrylamide) Star Polymers. Chemphyschem 2020; 21:1258-1271. [PMID: 32352214 PMCID: PMC7317447 DOI: 10.1002/cphc.202000273] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2020] [Revised: 04/29/2020] [Indexed: 12/02/2022]
Abstract
The thermoresponsive nature of aqueous solutions of poly(N-isopropylacrylamide) (PNIPAAM) star polymers containing 2, 3, 4, and 6 arms has been investigated by turbidity, dynamic light scattering, rheology, and rheo-SALS. Simulations of the thermosensitive nature of the single star polymers have also been conducted. Some of the samples form aggregates even at temperatures significantly below the lower critical solution temperature (LCST) of PNIPAAM. Increasing concentration and number of arms promotes associations at low temperatures. When the temperature is raised, there is a competition between size increase due to enhanced aggregation and a size reduction caused by contraction. Monte Carlo simulations show that the single stars contract with increasing temperature, and that this contraction is more pronounced when the number of arms is increased. Some samples exhibit a minimum in the turbidity data after the initial increase at the cloud point. The combined rheology and rheo-SALS data suggest that this is due to a fragmentation of the aggregates followed by re-aggregation at even higher temperatures. Although the 6-arm star polymer aggregates more than the other stars at low temperatures, the more compact structure renders it less prone to aggregation at temperatures above the cloud point.
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Affiliation(s)
- Kaizheng Zhu
- Faculty of EngineeringØstfold University CollegeP.O. Box 7001757HaldenNorway
| | - Ramón Pamies
- Department of Material Engineering and ManufacturingTechnical University of Cartagena CartagenaMurcia30202Spain
| | | | | | | | - Bo Nyström
- Department of ChemistryUniversity of OsloP.O. Box 1033, Blindern0315OsloNorway
| | - Anna‐Lena Kjøniksen
- Faculty of EngineeringØstfold University CollegeP.O. Box 7001757HaldenNorway
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Nyström B, Jin S, Schillberg B, Moström U, Lundin P, Taube A. Are degenerative spondylolisthesis and further slippage postoperatively really issues in spinal stenosis surgery? Scand J Pain 2020; 20:307-317. [PMID: 31927527 DOI: 10.1515/sjpain-2019-0113] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [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: 08/09/2019] [Accepted: 11/17/2019] [Indexed: 11/15/2022]
Abstract
Background and aims Opinions diverge concerning the prognostic importance of preoperative degenerative spondylolisthesis in patients with lumbar spinal stenosis, as well as the significance of further slippage post-operatively following decompression alone. However, a slip is only one among several factors related to the topic, e.g. duration and intensity of back and leg pain, pre-operative walking ability, number of levels operated and not least the experience of the surgeon. Our aim was to take all of the above-mentioned factors into consideration when analysing the patients' clinical outcome, reported as Change in back pain, Change in leg pain, Overall satisfaction and Change in walking ability, with special emphasis on the possible importance of pre- and/or post-operative degenerative spondylolisthesis. Methods We studied 200 consecutive patients, mean follow-up time 81 months (range 62-108). Before treatment and on the follow-up occasion all patients answered the SF-36 questionnaire and assessed their back and leg pain on a visual analogue scale (VAS). At follow-up the patients were asked about possible changes in back and leg pain (completely free, much better, somewhat better, unchanged, somewhat worse, much worse) and whether they were; satisfied with the outcome, in doubt or not satisfied. Before treatment and at follow-up the presence or not of degenerative spondylolisthesis was determined in the lateral view on a plain X-ray or MRI. By use of a microsurgical technique decompression was achieved in all patients by bilateral laminotomy not sparing the midline ligaments, irrespective of a degenerative spondylolisthesis or not. Eight surgeons with different surgical experience performed the operations. Four separate multivariate analyses were conducted, one for each clinical outcome. The Lasso method was used for variable selection and multiple imputation was applied to handle missing values. Results At follow-up 78.5% of the patients were completely satisfied with the outcome. Minimal clinical important difference (MCID) was achieved for 69% of the patients. Before surgery 28 patients were able to walk more than 1 km compared to 111 at follow-up. The reoperation rate at 6.8 years was 12% further decompressions and 2.5% fusions at the index level. Post-operative slippage was equally common in patients with and without a preoperative slip (around 30%). There were no notable differences in outcome in patients with and without a preoperative slip and no effect of further slippage at the index or another level post-operatively. Nor could the statistical analysis show any of the other covariates (age, gender, duration and intensity of back and leg pain, pre-operative walking ability or number of levels operated) to be of statistically significant importance for predicting the outcome. In the univariate statistical analysis differences were found between the patients of individual surgeons regarding satisfaction, pain improvement, and reoperation rates in favour of surgical experience, which were, however, not statistically significant in the multivariate analysis. Conclusions None of the covariates, including pre-operative spondylolisthesis and further slippage post-operatively, were statistically significant for predicting the clinical outcome. Implication Our results provide no evidence for adding fusion to the decompression.
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Affiliation(s)
- Bo Nyström
- Clinic of Spinal Surgery, Löt, Strängnäs, Sweden, Phone: +46703724962
| | - Shaobo Jin
- Department of Statistics, Uppsala University, Uppsala, Sweden
| | | | - Ulf Moström
- Department of Neuroradiology, Karolinska University Hospital, Stockholm, Sweden
| | - Per Lundin
- Department of Radiology, Central Hospital, Västerås, Sweden
| | - Adam Taube
- Department of Statistics, Uppsala University, Uppsala, Sweden
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15
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Fehér B, Zhu K, Nyström B, Varga I, Pedersen JS. Effect of Temperature and Ionic Strength on Micellar Aggregates of Oppositely Charged Thermoresponsive Block Copolymer Polyelectrolytes. Langmuir 2019; 35:13614-13623. [PMID: 31577150 DOI: 10.1021/acs.langmuir.9b01896] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
The self-assembly of two oppositely charged diblock copolymers that have a common thermosensitive nonionic block of poly(N-isopropylacrylamide) (pNIPAAM) has been investigated. The effect of the mixing ratio and total polymer concentrations on the self-assembly of the components and on the phase stability of the mixtures was studied by dynamic light scattering, electrophoretic mobility, and turbidimetry measurements in water at 20 °C. The effect of the competing electrostatic and hydrophobic interactions on the nanostructure of negatively charged electrostatically self-assembled micelles bearing a pNIPAAM corona was investigated by small-angle X-ray scattering (SAXS). The electrostatic and hydrophobic interactions were controlled independently by tuning the ionic strength (from pure water to 50 mM NaCl) and the temperature (20-50 °C) of the investigated mixtures. The SAXS data could be fitted by a spherical micelle model, which has a smoothly decaying radial profile and a Gaussian star term that describes the internal structure of the micellar structures and possible attractive interactions between the polymer chains. At high temperature, a cluster structure factor was included for describing the formation of bulky clusters of the formed micelles. At low temperature and ionic strength, the formation of micelles with a coacervate core and hydrated pNIPAAM shell was observed. The structural evolution of the self-assembled micelles with increasing ionic strength and temperature could be followed, and finally at high ionic strength and temperature, the formation of inverted micelles with a hydrophobic core and polyelectrolyte shell could be identified.
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Affiliation(s)
- Bence Fehér
- Institute of Chemistry , ELTE , Pázmány Péter sétány 1/A , Budapest 1117 , Hungary
- Department of Chemistry and Interdisciplinary Nanoscience Center (iNANO) , Aarhus University , Gustav Wieds Vej 14 , 8000 Aarhus C , Denmark
| | - Kaizheng Zhu
- Department of Chemistry , University of Oslo , P.O. Box 1033, Blindern , N-0315 Oslo , Norway
| | - Bo Nyström
- Department of Chemistry , University of Oslo , P.O. Box 1033, Blindern , N-0315 Oslo , Norway
| | - Imre Varga
- Institute of Chemistry , ELTE , Pázmány Péter sétány 1/A , Budapest 1117 , Hungary
| | - Jan Skov Pedersen
- Department of Chemistry and Interdisciplinary Nanoscience Center (iNANO) , Aarhus University , Gustav Wieds Vej 14 , 8000 Aarhus C , Denmark
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16
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Pandya AD, Jäger E, Bagheri Fam S, Höcherl A, Jäger A, Sincari V, Nyström B, Štěpánek P, Skotland T, Sandvig K, Hrubý M, Mælandsmo GM. Paclitaxel-loaded biodegradable ROS-sensitive nanoparticles for cancer therapy. Int J Nanomedicine 2019; 14:6269-6285. [PMID: 31496685 PMCID: PMC6689768 DOI: 10.2147/ijn.s208938] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2019] [Accepted: 06/13/2019] [Indexed: 12/15/2022] Open
Abstract
Background Reactive oxygen species (ROS), such as hydrogen peroxide and superoxide, trigger biodegradation of polymer-based nanoparticles (NPs) bearing pinacol-type boronic ester groups. These NPs may selectively release their cargo, in this case paclitaxel (PTX), at the high levels of ROS present in the intracellular environment of inflamed tissues and most tumors. Purpose The main objective was to determine anti-tumor efficacy of PTX-loaded ROS-sensitive NPs and to examine whether macrophage infiltration had any impact on treatment efficacy. Methods NPs were synthesized and their characteristics in the presence of H2O2 were demonstrated. Both confocal microscopy as well as flow cytometry approaches were used to determine degradation of ROS-sensitive NPs. HeLa cells were cultured in vitro and used to establish tumor xenografts in nude mice. In vivo experiments were performed to understand toxicity, biodistribution and anti-tumor efficacy of the NPs. Moreover, we performed immunohistochemistry on tumor sections to study infiltration of M1 and M2 subsets of macrophages. Results We demonstrated that PTX delivered in NPs containing a ROS-sensitive polymer exhibits a better anti-tumor efficacy than PTX in NPs containing ROS-non-sensitive polymer, free PTX or Abraxane® (nab-PTX). The biodistribution revealed that ROS-sensitive NPs exhibit retention in liver, spleen and lungs, suggesting a potential to target cancer metastasizing to these organs. Finally, we demonstrated a correlation between infiltrated macrophage subsets and treatment efficacy, possibly contributing to the efficient anti-tumor effects. Conclusion Treatment with ROS-sensitive NPs containing PTX gave an improved therapeutic effect in HeLa xenografts than their counterpart, free PTX or nab-PTX. Our data revealed a correlation between macrophage infiltration and efficiency of the different antitumor treatments, as the most effective NPs resulted in the highest infiltration of the anti-tumorigenic M1 macrophages.
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Affiliation(s)
- Abhilash D Pandya
- Department of Tumor Biology, Institute for Cancer Research, Oslo University Hospital, The Norwegian Radium Hospital, Oslo, Norway
| | - Eliézer Jäger
- Institute of Macromolecular Chemistry v.v.i, Academy of Sciences of the Czech Republic, Prague, Czech Republic
| | - Shahla Bagheri Fam
- Department of Radiation Biology, Institute for Cancer Research, Oslo University Hospital, The Norwegian Radium Hospital, Oslo, Norway
| | - Anita Höcherl
- Institute of Macromolecular Chemistry v.v.i, Academy of Sciences of the Czech Republic, Prague, Czech Republic
| | - Alessandro Jäger
- Institute of Macromolecular Chemistry v.v.i, Academy of Sciences of the Czech Republic, Prague, Czech Republic
| | - Vladimir Sincari
- Institute of Macromolecular Chemistry v.v.i, Academy of Sciences of the Czech Republic, Prague, Czech Republic
| | - Bo Nyström
- Department of Chemistry, University of Oslo, Oslo, Norway
| | - Petr Štěpánek
- Institute of Macromolecular Chemistry v.v.i, Academy of Sciences of the Czech Republic, Prague, Czech Republic
| | - Tore Skotland
- Department of Molecular Cell Biology, Institute for Cancer Research, Oslo University Hospital, The Norwegian Radium Hospital, Oslo, Norway
| | - Kirsten Sandvig
- Department of Molecular Cell Biology, Institute for Cancer Research, Oslo University Hospital, The Norwegian Radium Hospital, Oslo, Norway.,Department of Biosciences, University of Oslo, Oslo, Norway
| | - Martin Hrubý
- Institute of Macromolecular Chemistry v.v.i, Academy of Sciences of the Czech Republic, Prague, Czech Republic
| | - Gunhild M Mælandsmo
- Department of Tumor Biology, Institute for Cancer Research, Oslo University Hospital, The Norwegian Radium Hospital, Oslo, Norway.,Institute of Medical Biology, Faculty of Health Sciences, The Arctic University of Norway - University of Tromsø, Tromsø, Norway
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Stensgaard Diget J, Lund R, Nyström B, Wintgens V, Amiel C, Wimmer R, Terndrup Nielsen T. Self-assembled nanoparticles based on cyclodextrin-modified pullulan: Synthesis, and structural characterization using SAXS. Carbohydr Polym 2019; 213:403-410. [DOI: 10.1016/j.carbpol.2019.01.106] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2018] [Revised: 01/29/2019] [Accepted: 01/29/2019] [Indexed: 10/27/2022]
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18
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Schillén K, Galantini L, Du G, Del Giudice A, Alfredsson V, Carnerup AM, Pavel NV, Masci G, Nyström B. Block copolymers as bile salt sequestrants: intriguing structures formed in a mixture of an oppositely charged amphiphilic block copolymer and bile salt. Phys Chem Chem Phys 2019; 21:12518-12529. [PMID: 31145393 DOI: 10.1039/c9cp01744e] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
To study the formation and characterize the structure of mixed complexes of oppositely charged block copolymers and surfactants are of great significance for practical applications, e.g., in drug carrier formulations that are based on electrostatically assisted assembly. In this context, biocompatible block copolymers and biosurfactants (like bile salts) are particularly interesting. In this work, we report on the co-assembly in dilute aqueous solution between a cationic poly(N-isopropyl acryl amide) (PNIPAM) diblock copolymer and the oppositely charged bile salt surfactant sodium deoxycholate at ambient temperature. The cryogenic transmission electron microscopy (cryo-TEM) experiments revealed the co-existence of two types of co-assembled complexes of radically different morphology and inner structure. They are formed mainly as a result of the electrostatic attraction between the positively charged copolymer blocks and bile salt anions and highlight the potential of using linear amphiphilic block copolymers as bile salt sequestrants in the treatment of bile acid malabsorption and hypercholesterolemia. The first complex of globular morphology has a coacervate core of deoxycholate anions and charged copolymer blocks surrounded by a PNIPAM corona. The second complex has an intriguing tape-like supramolecular morphology of several micrometer in length that is striped in the direction of the long axis. A model is presented in which the stretched cationic blocks of several block copolymers interact electrostatically with the bile salt molecules that are associated to form a zipper-like structure. The tape is covered on both sides by the PNIPAM chains that stabilize the overall complex in solution. In addition to cryo-TEM, the mixed system was investigated in a range of molar charge fractions at a constant copolymer concentration by static light scattering, small angle X-ray scattering, and electrophoretic mobility measurements.
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Affiliation(s)
- Karin Schillén
- Division of Physical Chemistry, Department of Chemistry, Lund University, P.O. Box 124, SE-221 00 Lund, Sweden.
| | - Luciano Galantini
- Department of Chemistry, Sapienza University of Rome, P.O. Box 34-Roma 62, Piazzale A. Moro 5, I-00185 Roma, Italy.
| | - Guanqun Du
- Division of Physical Chemistry, Department of Chemistry, Lund University, P.O. Box 124, SE-221 00 Lund, Sweden.
| | - Alessandra Del Giudice
- Department of Chemistry, Sapienza University of Rome, P.O. Box 34-Roma 62, Piazzale A. Moro 5, I-00185 Roma, Italy.
| | - Viveka Alfredsson
- Division of Physical Chemistry, Department of Chemistry, Lund University, P.O. Box 124, SE-221 00 Lund, Sweden.
| | - Anna M Carnerup
- Division of Physical Chemistry, Department of Chemistry, Lund University, P.O. Box 124, SE-221 00 Lund, Sweden.
| | - Nicolae V Pavel
- Department of Chemistry, Sapienza University of Rome, P.O. Box 34-Roma 62, Piazzale A. Moro 5, I-00185 Roma, Italy.
| | - Giancarlo Masci
- Department of Chemistry, Sapienza University of Rome, P.O. Box 34-Roma 62, Piazzale A. Moro 5, I-00185 Roma, Italy.
| | - Bo Nyström
- Department of Chemistry, University of Oslo, P.O. Box 1033, Blindern N-0315, Oslo, Norway
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19
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Gjerde N, Zhu K, Knudsen KD, Nyström B. Influence of poly(ε-caprolactone) end-groups on the temperature-induced macroscopic gelation of Pluronic in aqueous media. Eur Polym J 2019. [DOI: 10.1016/j.eurpolymj.2019.01.033] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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20
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Schlachet I, Trousil J, Rak D, Knudsen KD, Pavlova E, Nyström B, Sosnik A. Chitosan-graft-poly(methyl methacrylate) amphiphilic nanoparticles: Self-association and physicochemical characterization. Carbohydr Polym 2019; 212:412-420. [PMID: 30832875 DOI: 10.1016/j.carbpol.2019.02.022] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2018] [Revised: 02/03/2019] [Accepted: 02/08/2019] [Indexed: 02/09/2023]
Abstract
In this work, we synthesized and characterized the self-assembly behavior of a chitosan-poly(methyl methacrylate) graft copolymer and the properties of the formed nanoparticles by static and dynamic light scattering, small-angle neutron scattering, and transmission electron microscopy. Overall, our results indicate that the hydrophobization of the chitosan side-chain with PMMA leads to a complex array of small unimolecular and/or small-aggregation number "building blocks" that further self-assemble into larger amphiphilic nanoparticles.
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Affiliation(s)
- Inbar Schlachet
- Laboratory of Pharmaceutical Nanomaterials Science, Department of Materials Science and Engineering, Technion-Israel Institute of Technology, 320003 Haifa, Israel
| | - Jiří Trousil
- Institute of Macromolecular Chemistry, Czech Academy of Sciences, Heyrovského náměstí 2, 162 06 Prague 6, Czechia; Department of Analytical Chemistry, Charles University, Faculty of Science, Hlavova 8, 128 43 Prague 2, Czechia
| | - Dmytro Rak
- Institute of Experimental Physics, Slovak Academy of Sciences, Watsonova 47, 040 01 Košice, Slovakia
| | - Kenneth D Knudsen
- Department of Physics, Institute for Energy Technology, P. O. Box 40, N-2027 Kjeller, Norway
| | - Ewa Pavlova
- Institute of Macromolecular Chemistry, Czech Academy of Sciences, Heyrovského náměstí 2, 162 06 Prague 6, Czechia
| | - Bo Nyström
- Department of Chemistry, University of Oslo, P.O. Box 1033, Blindern, N-0315 Oslo, Norway
| | - Alejandro Sosnik
- Laboratory of Pharmaceutical Nanomaterials Science, Department of Materials Science and Engineering, Technion-Israel Institute of Technology, 320003 Haifa, Israel.
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21
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Pooch F, Sliepen M, Knudsen KD, Nyström B, Tenhu H, Winnik FM. Poly(2-isopropyl-2-oxazoline)- b-poly(lactide) (PiPOx- b-PLA) Nanoparticles in Water: Interblock van der Waals Attraction Opposes Amphiphilic Phase Separation. Macromolecules 2019; 52:1317-1326. [PMID: 31496543 PMCID: PMC6727592 DOI: 10.1021/acs.macromol.8b02558] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2018] [Revised: 01/16/2019] [Indexed: 12/17/2022]
Abstract
Poly(2-isopropyl-2-oxazoline)-b-poly(lactide) (PiPOx-b-PLA) diblock copolymers comprise two miscible blocks: the hydrophilic and thermosensitive PiPOx and the hydrophobic PLA, a biocompatible and biodegradable polyester. They self-assemble in water, forming stable dispersions of nanoparticles with hydrodynamic radii (R h) ranging from ∼18 to 60 nm, depending on their molar mass, the relative size of the two blocks, and the configuration of the lactide unit. Evidence from 1H nuclear magnetic resonance spectroscopy, light scattering, small-angle neutron scattering, and cryo-transmission electron microscopy indicates that the nanoparticles do not adopt the typical core-shell morphology. Aqueous nanoparticle dispersions heated from 20 to 80 °C were monitored by turbidimetry and microcalorimetry. Nanoparticles of copolymers containing a poly(dl-lactide) block coagulated irreversibly upon heating to 50 °C, forming particles of various shapes (R h ∼ 200-500 nm). Dispersions of PiPOx-b-poly(l-lactide) coagulated to a lesser extent or remained stable upon heating. From the entire experimental evidence, we conclude that PiPOx-b-PLA nanoparticles consist of a core of PLA/PiPOx chains associated via dipole-dipole interactions of the PLA and PiPOx carbonyl groups. The core is surrounded by tethered PiPOx loops and tails responsible for the colloidal stability of the nanoparticles in water. While the core of all nanoparticles studied contains associated PiPOx and PLA blocks, fine details of the nanoparticles morphology vary predictably with the size and composition of the copolymers, yielding particles of distinctive thermosensitivity in aqueous dispersions.
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Affiliation(s)
- Fabian Pooch
- Department
of Chemistry, University of Helsinki, P.O. Box 55, Helsinki 00014, Finland
| | - Marjolein Sliepen
- Department
of Chemistry, University of Helsinki, P.O. Box 55, Helsinki 00014, Finland
| | - Kenneth D. Knudsen
- Department
of Physics, Institute for Energy Technology, P.O. Box 40, N-2027 Kjeller, Norway
| | - Bo Nyström
- Department
of Chemistry, University of Oslo, P.O. Box 1033, Blindern, N-0315 Oslo, Norway
| | - Heikki Tenhu
- Department
of Chemistry, University of Helsinki, P.O. Box 55, Helsinki 00014, Finland
| | - Françoise M. Winnik
- Department
of Chemistry, University of Helsinki, P.O. Box 55, Helsinki 00014, Finland
- International
Center for Materials Nanoarchitectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
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22
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Motlaq VF, Knudsen KD, Nyström B. Effect of PEGylation on the stability of thermoresponsive nanogels. J Colloid Interface Sci 2018; 524:245-255. [DOI: 10.1016/j.jcis.2018.04.024] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2018] [Revised: 03/29/2018] [Accepted: 04/05/2018] [Indexed: 01/04/2023]
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Svensson E, Nyström B, Goldie I, Landrø NI, Sidén Å, Staff P, Schillberg B, Taube A. Superior outcomes following cervical fusion vs. multimodal rehabilitation in a subgroup of randomized Whiplash-Associated-Disorders (WAD) patients indicating somatic pain origin-Comparison of outcome assessments made by four examiners from different disciplines. Scand J Pain 2018; 18:175-186. [PMID: 29794310 DOI: 10.1515/sjpain-2017-0180] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2017] [Accepted: 02/01/2018] [Indexed: 11/15/2022]
Abstract
BACKGROUND AND AIMS Whiplash-Associated Disorders (WAD) are characterized by great variability in long-term symptoms. Patients with central neck and movement-induced stabbing pain participated in a randomized study comparing cervical fusion and multimodal rehabilitation. As reported in our previous paper, more patients treated by cervical fusion than by rehabilitation experienced pain relief. Although patient reported outcome measures are a core component of outcome evaluation, independent examiner has been recommended. Because of the heterogeneity of WAD complaints the patients in our study were examined at baseline and follow-up by four experts representing neurology, orthopedics, psychology and physical medicine. The aim was to compare the professional assessments of change both regarding the possible impact of the different examiners' perspectives on individual patient's outcome, and also on the analysis of possible outcome differences between the treatment groups. METHODS WAD patients with long-term neck pain as the predominant symptom after a traffic accident were eligible. The neck pain origin should be in the midline and perceived as dull and aching, with sudden movement inducing midline stabbing pain. Of the 1,052 patients in contact with our team, 49 were eligible. The overall treatment effect was evaluated on a global outcome transitional scale. The criteria for the scale categories were defined by each expert's professional perspective on change in the whiplash complaints. Statistical methods that take account of the non-metric properties of ordered categorical data were used. Observed inter-expert disagreement was evaluated by the Svensson method that identifies and measures systematic group-related disagreement separately from disagreement caused by individual variation. Possible differences in the distributions of assessments on the expert-specific outcome scales between the treatment groups were analyzed by the Kruskal-Wallis test. RESULTS The per-protocol evaluation showed that a majority of the 18 patients who underwent fusion surgery were assessed as somewhat or much better, ranging from 67% to 78% depending on the expert. Corresponding proportions of improvement in the 17 patients treated by multimodal rehabilitation ranged from 29% to 53%. The statistical analyses confirmed better outcomes in the patients treated by fusion surgery, with p-values ranging from 0.003 to 0.04. The experts' assessments of intra-patient change disagreed more or less for all patients. The analyses of the paired comparisons confirmed that these disagreements could most probably be explained by the different profession-specific operational definitions of the outcome scales rather than by individual variations in data. CONCLUSIONS The multi-dimensional complexity of WAD-related complaints was comprehensively demonstrated by the inter-disciplinary disagreements in assessing intra-patient outcomes. The superiority of positive treatment effects in patients who underwent cervical fusion compared with multimodal rehabilitation was evident to all experts. IMPLICATIONS The results strengthen our previous opinion that neck pain in this subgroup of WAD patients has a somatic origin. More than one examiner is recommended for multi-dimensional outcome assessments.
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Affiliation(s)
- Elisabeth Svensson
- Department of Statistics, Örebro University, SE-70182 Örebro, Sweden;Present address: Sländvägen 6, SE-38634 Färjestaden, Sweden
| | - Bo Nyström
- Clinic of Spinal Surgery, Löt, SE-64595 Strängnäs, Sweden;Present address: Department of Neuroscience, Section of Neurosurgery, University Hospital, SE-75185 Uppsala, Sweden
| | - Ian Goldie
- Department of Orthopaedics, Karolinska University Hospital, Solna, SE-17176 Stockholm, Sweden
| | - Nils Inge Landrø
- Centre for the Study of Human Cognition, Department of Psychology, University of Oslo, NO-0373 Oslo, Norway;Present address: Clinical Neuroscience Research Group, Department of Psychology, University of Oslo, NO-0373 Oslo, Norway
| | - Åke Sidén
- Department of Neurology, Karolinska University Hospital, Huddinge, SE-14186 Stockholm, Sweden
| | - Peer Staff
- Department of Physical Medicine and Rehabilitation, Oslo University Hospital, NO-0405 Oslo, Norway;Present address: Tråkka 1, NO-0774 Oslo, Norway
| | | | - Adam Taube
- Department of Statistics, Uppsala University, SE-75120 Uppsala, Sweden
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Gjerde N, Zhu K, Nyström B, Knudsen KD. Effect of PCL end-groups on the self-assembly process of Pluronic in aqueous media. Phys Chem Chem Phys 2018; 20:2585-2596. [PMID: 29318229 DOI: 10.1039/c7cp07240f] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Understanding self-assembly of amphiphilic copolymers in aqueous solution is an important issue in many areas, e.g., in order to tailor-make carriers for drugs and genes. We have synthesized modified versions of the copolymer of type PEO-PPO-PEO (Pluronic, F127), with short (PCL(5)) or long (PCL(11)) PCL blocks at both ends. Turbidity, dynamic light scattering (DLS), small angle neutron scattering (SANS), and rheology measurements were carried out on dilute aqueous solutions of these polymers to investigate their self-assembly behavior. The DLS results clearly show that both micellization and inter-micellization can be controlled by polymer concentration, temperature, and length of the PCL block. The interplay between unimers, micelles, and clusters of micelles could be monitored and the size and size distribution of the species were determined. The SANS data could be portrayed by a spherical core-shell model at all considered conditions of temperature and concentration for F127 and PCL(5) apart from F127 at the lowest temperature measured. The SANS data for PCL(11) were described by a spherical core-shell model at low temperatures, whereas at elevated temperatures asymmetric sub-structures appeared and a cylindrical core-shell model was employed in the analysis of the data. The appearance of pronounced correlation peaks at elevated temperatures signalizes marked intermicellar interactions. The shear viscosity data revealed a minor shear thinning effect, suggesting that the interchain structures are rather stable and not easily disrupted. The work shows that PCL-modification of Pluronic has a large influence on the self-assembly process and on the final structure of the assemblies.
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Affiliation(s)
- Natalie Gjerde
- Department of Chemistry, University of Oslo, P.O. Box 1033, Blindern, N-0315 Oslo, Norway.
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Salimi-Kenari H, Mollaie F, Dashtimoghadam E, Imani M, Nyström B. Effects of chain length of the cross-linking agent on rheological and swelling characteristics of dextran hydrogels. Carbohydr Polym 2018; 181:141-149. [DOI: 10.1016/j.carbpol.2017.10.056] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2017] [Revised: 10/11/2017] [Accepted: 10/16/2017] [Indexed: 12/11/2022]
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Dashtimoghadam E, Salimi-Kenari H, Forooqi Motlaq V, Hasani-Sadrabadi MM, Mirzadeh H, Zhu K, Knudsen KD, Nyström B. Synthesis and temperature-induced self-assembly of a positively charged symmetrical pentablock terpolymer in aqueous solutions. Eur Polym J 2017. [DOI: 10.1016/j.eurpolymj.2017.10.008] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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Zajforoushan Moghaddam S, Zhu K, Nyström B, Thormann E. Thermo-responsive diblock and triblock cationic copolymers at the silica/aqueous interface: A QCM-D and AFM study. J Colloid Interface Sci 2017. [DOI: 10.1016/j.jcis.2017.06.044] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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Kaczmarek D, Diget JS, Nyström B, Gyulai G, Mészáros R, Gilányi T, Varga I. Response of block copolyelectrolyte complexes to addition of ionic surfactants. Colloids Surf A Physicochem Eng Asp 2017. [DOI: 10.1016/j.colsurfa.2017.04.078] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Nyström B, Weber H, Schillberg B, Taube A. Symptoms and signs possibly indicating segmental, discogenic pain. A fusion study with 18 years of follow-up. Scand J Pain 2017; 16:213-220. [PMID: 28850405 DOI: 10.1016/j.sjpain.2016.10.007] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2016] [Revised: 10/21/2016] [Accepted: 10/27/2016] [Indexed: 11/16/2022]
Abstract
BACKGROUND Only two out of the five existing randomized studies have reported better results from fusion surgery for chronic low back pain (CLBP) compared to conservative treatment. In these studies the back symptoms of the patients were described simply as "chronic low back pain". One possible reason for the modest results of surgery is the lack of a description of specified symptoms that might be related to a painful segment/disc, and patient selection may therefore be more or less a matter of chance. Previous prospective studies including facet joint injections and discography and eventually MRI have failed to identify patients with a painful segment/disc that will benefit from fusion surgery. PURPOSE Our purpose was to analyse in detail the pre-operative symptoms and signs presented by patients who showed substantial relief from their back pain following spinal fusion surgery with the aim of possibly finding a pain pattern indicating segmental, discogenic pain. METHODS We analysed 40 consecutive patients, mean age 41 years, with a history of disabling low back pain for a mean of 7.7 years. Before surgery the patients completed a detailed questionnaire concerning various aspects of their back pain, and findings at clinical examination were thoroughly noted. Monosegmental posterior lumbar interbody fusion without internal fixation was performed using microsurgical technique. Outcome was assessed at 1, 2 and 4 years after surgery and finally at 18 years, using self-reporting measures and assessment by an independent examiner. Assessment at 18 years applied the Balanced Inventory for Spinal Disorders Questionnaire and the Roland-Morris Disability Questionnaire. RESULTS According to the independent observer's assessment at two years 27 of the 40 patients were much improved. Analysis of the pre-operative depiction of the back symptoms of this group revealed a rather uniform pattern, the most important being: dominating back pain originating in the midline of the spine, with a dull, aching character and stabbing pain in the same area provoked by sudden movements. Most patients in this group also had diffuse pain radiation of various extension down one or both legs and often bladder dysfunction with frequency. At clinical examination, localized interspinal tenderness was observed within the spinal area in question and the patient's back pain was provoked by pressure in that area and by tapping a neighbouring spinous process. At 18 years after surgery 19 patients assessed themselves as much improved. At that time 5 of them had pension due to age, 7 early pension, one worked full time and six patients part time. Eleven patients were re-operated due to defect bony healing. CONCLUSIONS The results may suggest that the use of a detailed symptom analysis and clinical examination may make it possible to select a subgroup of patients within the CLBP group likely to have better outcome following fusion surgery. IMPLICATIONS The next step would be to execute prospective studies and if our findings concerning back pain details and signs among CLPB patients can be confirmed this can provide for more accurate selection of patients suitable for fusion surgery.
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Affiliation(s)
- Bo Nyström
- Clinic of Spinal Surgery, Löt, SE-64594 Strängnäs, Sweden.
| | - Henrik Weber
- Department of Neurology, Ullevål Hospital, Oslo, Norway
| | | | - Adam Taube
- Department of Statistics, Uppsala University, SE-75120 Uppsala, Sweden
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Smistad G, Nyström B, Zhu K, Grønvold MK, Røv-Johnsen A, Hiorth M. Liposomes coated with hydrophobically modified hydroxyethyl cellulose: Influence of hydrophobic chain length and degree of modification. Colloids Surf B Biointerfaces 2017; 156:79-86. [DOI: 10.1016/j.colsurfb.2017.04.061] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2016] [Revised: 04/29/2017] [Accepted: 04/29/2017] [Indexed: 12/20/2022]
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Bayati S, Bergquist KE, Zhu K, Nyström B, Skov Pedersen J, Galantini L, Schillén K. Mixed micelles of oppositely charged poly(N-isopropylacrylamide) diblock copolymers. ACTA ACUST UNITED AC 2017. [DOI: 10.1002/polb.24403] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Solmaz Bayati
- Division of Physical Chemistry, Department of Chemistry; Lund University; P.O. Box 124 SE-221 00 Lund Sweden
| | - Karl-Erik Bergquist
- Center for Analysis and Synthesis; Department of Chemistry, Lund University; P.O. Box 124 SE-221 00 Lund Sweden
| | - Kaizheng Zhu
- Department of Chemistry; University of Oslo; Postboks 1033 0315 Blindern Oslo Norway
| | - Bo Nyström
- Department of Chemistry; University of Oslo; Postboks 1033 0315 Blindern Oslo Norway
| | - Jan Skov Pedersen
- Department of Chemistry and Interdisciplinary Nanoscience Center (iNANO); Aarhus University; Gustav Wieds Vej 14 8000 Aarhus C Denmark
| | - Luciano Galantini
- Department of Chemistry; “La Sapienza” University of Rome; P. le A. Moro 5 00185 Rome Italy
| | - Karin Schillén
- Division of Physical Chemistry, Department of Chemistry; Lund University; P.O. Box 124 SE-221 00 Lund Sweden
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Nyström B, Gregebo B, Taube A, Almgren SO, Schillberg B, Zhu Y. Clinical outcome following anterior arthrodesis in patients with presumed sacroiliac joint pain. Scand J Pain 2017; 17:22-29. [PMID: 28850369 DOI: 10.1016/j.sjpain.2017.06.005] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [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: 02/22/2017] [Revised: 06/13/2017] [Accepted: 06/20/2017] [Indexed: 11/19/2022]
Abstract
BACKGROUND It has been reported that in 13-32% of patients with chronic low back pain, the pain may originate in the sacroiliac (SI) joints. When treatment of these patients with analgesics and physiotherapy has failed, a surgical solution may be discussed. Results of such surgery are often based on small series, retrospective analyses or studies using a minimal invasive technique, frequently sponsored by manufacturers. PURPOSE To report the clinical outcome concerning pain, function and quality of life following anterior arthrodesis in patients presumed to have SI joint pain using validated questionnaires pre- and post-operatively. An additional aim was to describe the symptoms of the patients included and the preoperative investigations performed. MATERIAL AND METHODS Over a 6 year period we treated 55 patients, all women, with a mean age of 45 years (range 28-65) and a mean pelvic pain duration of 9.1 years (range 2-30). The pain started in connection with minor trauma in seven patients, pregnancy in 20 and unspecified in 28. All patients had undergone long periods of treatment including physiotherapy, manipulation, needling, pelvic belt, massage and chiropractic without success, and 15 had been operated for various spinal diagnoses without improvement. The patients underwent thorough neurological investigation, plain X-ray and MRI of the spine and plain X-ray of the pelvis. They were investigated by seven clinical tests aimed at indicating pain from the SI joints. In addition, all patients underwent a percutaneous mechanical provocation test and extra-articular local anaesthetic blocks against the posterior part of the SI joints. Before surgery all patients answered the generic Short-Form-36 (SF-36) questionnaire, the disease specific Balanced Inventory for Spinal Disorders (BIS) questionnaire and rated their level of pelvic and leg pain (VAS, 0-100). At follow-up at a mean of 2 years 49 patients completed the same questionnaires (89%). RESULTS At follow-up 26 patients reported a lower level of pelvic pain than before surgery, 16 the same level and six a higher level. Applying Svensson's method RPpelvic pain=0.3976, with 95% CI (0.2211, 0.5740) revealed a statistically significant systematic improvement in pelvic pain. At follow-up 28 patients reported a higher quality of life and 26 reported sleeping better than pre-operatively. In most patients the character of the pelvic pain was dull and aching, often accompanied by a stabbing component in connection with sudden movements. Referred pain down the leg/s even to the feet and toes was noted by half of the patients and 29 experienced frequency of micturition. CONCLUSIONS It is apparent that in some patients the SI joints may cause long-term pain that can be treated by arthrodesis. We speculate that continued pain despite a healed arthrodesis may be due to persistent pain from adjacent ligaments. The next step should be a prospective randomized study comparing posterior fusion and ligament resection with non-surgical treatment. IMPLICATIONS Anterior arthrodesis can apparently relieve pain in some patients with presumed SI joint pain. The problem is how to identify these patients within the low back pain group.
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Affiliation(s)
- Bo Nyström
- Clinic of Spinal Surgery, Löt, SE-64594 Strängnäs, Sweden.
| | | | - Adam Taube
- Dept. of Statistics, Uppsala University, SE-75120 Uppsala, Sweden
| | | | | | - Yingyan Zhu
- Dept. of Statistics, Uppsala University, SE-75120 Uppsala, Sweden
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Azizi M, Ghourchian H, Yazdian F, Bagherifam S, Bekhradnia S, Nyström B. Anti-cancerous effect of albumin coated silver nanoparticles on MDA-MB 231 human breast cancer cell line. Sci Rep 2017; 7:5178. [PMID: 28701707 PMCID: PMC5508052 DOI: 10.1038/s41598-017-05461-3] [Citation(s) in RCA: 98] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2016] [Accepted: 05/10/2017] [Indexed: 01/23/2023] Open
Abstract
With the aim of making specific targeting of silver nanoparticles as a drug for tumor cells and developing new anticancer agents, a novel nano-composite was developed. Albumin coated silver nanoparticles (ASNPs) were synthesized, and their anti-cancerous effects were evaluated against MDA-MB 231, a human breast cancer cell line. The synthesized ASNPs were characterized by spectroscopic methods. The morphological changes of the cells were observed by inverted, florescent microscopy and also by DNA ladder pattern on gel electrophoresis; the results revealed that the cell death process occurred through the apoptosis mechanism. It was found that ASNPs with a size of 90 nm and negatively charged with a zeta-potential of about −20 mV could be specifically taken up by tumor cells. The LD50 of ASNPs against MDA-MB 231 (5 μM), was found to be 30 times higher than that for white normal blood cells (152 μM). The characteristics of the synthesized ASNPs included; intact structure of coated albumin, higher cytotoxicity against cancer cells than over normal cells, and cell death based on apoptosis and reduction of gland tumor sizes in mice. This work indicates that ASNPs could be a good candidate for chemotherapeutic drug.
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Affiliation(s)
- Marzieh Azizi
- Institute of Biochemistry and Biophysics (IBB), University of Tehran, Tehran, Iran.,Department of Chemistry, University of Oslo, Oslo, Norway
| | | | - Fatemeh Yazdian
- Faculty of New Science and Technology, University of Tehran, Tehran, Iran
| | - Shahla Bagherifam
- Institute for Cancer Research, Norwegian Radium Hospital, Oslo, Norway.,Department of Chemistry, University of Oslo, Oslo, Norway
| | | | - Bo Nyström
- Department of Chemistry, University of Oslo, Oslo, Norway
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Nielsen JE, Zhu K, Sande SA, Kováčik L, Cmarko D, Knudsen KD, Nyström B. Structural and Rheological Properties of Temperature-Responsive Amphiphilic Triblock Copolymers in Aqueous Media. J Phys Chem B 2017; 121:4885-4899. [PMID: 28430448 DOI: 10.1021/acs.jpcb.7b01174] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Thermoresponsive amphiphilic biodegradable block copolymers of the type poly(ε-caprolactone-co-lactide)-poly(ethylene glycol)-poly(ε-caprolactone-co-lactide) (PCLA-PEGm-PCLA) have great potential for various biomedical applications. In the present study, we have surveyed the effects of PEG spacer length (m = 1000 and 1500), temperature, and polymer concentration on the self-assembling process to form supramolecular structures in aqueous solutions of the PCLA-PEGm-PCLA copolymer. This copolymer has a lower critical solution temperature, and the cloud point depends on both concentration and PEG length. Thermoreversible hydrogels are formed in the semidilute regime; the gel windows in the phase diagrams can be tuned by the concentration and length of the PEG spacer. The rheological properties of both dilute and semidilute samples were characterized; especially the sol-to-gel transition was examined. Small-angle neutron scattering (SANS) experiments reveal fundamental structural differences between the two copolymers for both dilute and semidilute samples. The intensity profiles for the copolymer with the long PEG spacer could be described by a spherical core-shell model over a broad temperature domain, whereas the copolymer with the short hydrophilic spacer forms rod-like species over an extended temperature range. This finding is supported by cryo-TEM images. At temperatures approaching macroscopic phase separation, both copolymers seem to assume extended rod-like structures.
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Affiliation(s)
- Josefine Eilsø Nielsen
- School of Pharmacy, Department of Pharmaceutics, University of Oslo , P.O. Box 1068, Blindern, N-0316 Oslo, Norway.,Department of Chemistry, University of Oslo , P.O. Box 1033, Blindern, N-0315 Oslo, Norway
| | - Kaizheng Zhu
- Department of Chemistry, University of Oslo , P.O. Box 1033, Blindern, N-0315 Oslo, Norway
| | - Sverre Arne Sande
- School of Pharmacy, Department of Pharmaceutics, University of Oslo , P.O. Box 1068, Blindern, N-0316 Oslo, Norway
| | - Lubomír Kováčik
- Institute of Biology and Medical Genetics, First Faculty of Medicine, Charles University and General University Hospital in Prague , Albertov 4, Prague, 128 01, Czech Republic
| | - Dušan Cmarko
- Institute of Biology and Medical Genetics, First Faculty of Medicine, Charles University and General University Hospital in Prague , Albertov 4, Prague, 128 01, Czech Republic
| | - Kenneth D Knudsen
- Department of Physics, Institute for Energy Technology , P.O. Box 40, N-2027 Kjeller, Norway
| | - Bo Nyström
- Department of Chemistry, University of Oslo , P.O. Box 1033, Blindern, N-0315 Oslo, Norway
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35
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Lazzara G, Campbell RA, Bayati S, Zhu K, Nyström B, Nylander T, Schillén K. On the formation of inclusion complexes at the solid/liquid interface of anchored temperature-responsive PNIPAAM diblock copolymers with γ-cyclodextrin. Colloid Polym Sci 2017; 295:1327-1341. [PMID: 28794578 PMCID: PMC5519650 DOI: 10.1007/s00396-017-4052-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2017] [Revised: 02/08/2017] [Accepted: 02/14/2017] [Indexed: 11/08/2022]
Abstract
The thermal responsive behavior of adsorbed layers of diblock copolymers of poly(N-isopropylacrylamide) (PNIPAAM) and poly((3-acrylamidopropyl)trimethylammonium chloride) (PAMPTMA(+)) with γ-cyclodextrin (γ-CD) at the solid/liquid interface has been investigated using three in situ techniques: null ellipsometry, quartz-crystal microbalance with dissipation monitoring, and neutron reflectometry. The measurements provided information about the adsorbed amounts, the layer thickness, hydration and viscoelastic properties, and the interfacial structure and composition. The copolymers adsorb to silica with the cationic PAMPTMA(+) blocks sitting as anchors in a flat conformation and the PNIPAAM chains extending into the solution. The copolymer system alone exhibits reversible collapse above the lower critical solution temperature of PNIPAAM. The addition of γ-CD to pre-adsorbed copolymer layers results in a highly extended conformation as well as some loss of copolymer from the surface, which we discuss in terms of the formation of surface-invoked lateral steric repulsion of formed inclusion complexes.
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Affiliation(s)
- Giuseppe Lazzara
- Division of Physical Chemistry, Department of Chemistry, Lund University, P.O. Box 124, SE-221 00 Lund, Sweden
- Department of Physics and Chemistry, University of Palermo, Viale delle Scienze, 90128 Palermo, IT Italy
| | | | - Solmaz Bayati
- Division of Physical Chemistry, Department of Chemistry, Lund University, P.O. Box 124, SE-221 00 Lund, Sweden
- Akzo Nobel Surface Chemistry AB, Stenunge Allé 3, SE-444 85 Stenungsund, Sweden
| | - Kaizheng Zhu
- Department of Chemistry, University of Oslo, P.O. Box 1033, Blindern, 0315 Oslo, Norway
| | - Bo Nyström
- Department of Chemistry, University of Oslo, P.O. Box 1033, Blindern, 0315 Oslo, Norway
| | - Tommy Nylander
- Division of Physical Chemistry, Department of Chemistry, Lund University, P.O. Box 124, SE-221 00 Lund, Sweden
| | - Karin Schillén
- Division of Physical Chemistry, Department of Chemistry, Lund University, P.O. Box 124, SE-221 00 Lund, Sweden
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36
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Dashtimoghadam E, Bahlakeh G, Salimi-Kenari H, Hasani-Sadrabadi MM, Mirzadeh H, Nyström B. Rheological Study and Molecular Dynamics Simulation of Biopolymer Blend Thermogels of Tunable Strength. Biomacromolecules 2016; 17:3474-3484. [PMID: 27766854 DOI: 10.1021/acs.biomac.6b00846] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The temperature-induced gelation of chitosan/glycerophosphate (Chs/GP) systems through physical interactions has shown great potential for various biomedical applications. In the present work, hydroxyethyl cellulose (HEC) was added to the thermosensitive Chs/GP solution to improve the mechanical strength and gel properties of the incipient Chs/HEC/GP gel in comparison with the Chs/GP hydrogel at body temperature. The physical features of the macromolecular complexes formed by the synergistic interaction between chitosan and hydroxyethyl cellulose in the presence of β-glycerophosphate disodium salt solution have been studied essentially from a rheological point of view. The temperature and time sweep rheological characterizations of the thermogelling systems revealed that the sol-gel transition temperature of the Chs/HEC/GP blends is equal to 37 °C at neutral pH; with increasing HEC content in the solutions, more compact networks with considerably improved gel strength are formed without influencing the gelation time. The formed hydrogel matrix has enough mechanical integrity and adequate strength for using it as injectable in situ forming matrices for biomedical applications. The classical Winter-Chambon (W-C) and Fredrickson-Larson (F-L) theories were applied to determine the gel point. In view of the obtained results, it is shown that the F-L theory can be employed as a robust and less tedious method than the W-C approach to precisely determine the gel point in these systems. At the end, molecular simulation studies were conducted by using ab initio quantum mechanics (QM) calculations carried out on Chs and HEC models, and molecular dynamics (MD) simulations of solvated Chs/HEC blend systems showed the binding behavior of Chs/HEC polymers. Analyses of interaction energy, radial distribution function, and hydrogen bonding from simulation studies strongly supported the experimental results; they all disclosed that hydrogen-bond formation between Chs moieties with regard to HEC chains plays an important role for the stabilization of the complexes.
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Affiliation(s)
- Erfan Dashtimoghadam
- Department of Developmental Sciences, Marquette University School of Dentistry , Milwaukee, Wisconsin, United States.,Department of Chemistry, University of Oslo , Oslo, Norway.,Department of Polymer Engineering and Color Technology, Amirkabir University of Technology , Tehran, Iran
| | - Ghasem Bahlakeh
- Department of Engineering and Technology, Golestan University , Aliabad Katool, Iran
| | - Hamed Salimi-Kenari
- Faculty of Engineering and Technology, University of Mazandaran , Babolsar, Iran
| | - Mohammad Mahdi Hasani-Sadrabadi
- Laboratoire de Microsystemes (LMIS4), Institute of Microengineering, Institute of Bioengineering, École Polytechnique Fédérale de Lausanne (EPFL) , Lausanne, Switzerland.,Parker H. Petit Institute for Bioengineering and Bioscience and G.W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology , Atlanta, Georgia, United States
| | - Hamid Mirzadeh
- Department of Polymer Engineering and Color Technology, Amirkabir University of Technology , Tehran, Iran
| | - Bo Nyström
- Department of Chemistry, University of Oslo , Oslo, Norway
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Khorshid NK, Zhu K, Knudsen KD, Bekhradnia S, Sande SA, Nyström B. Novel Structural Changes during Temperature-Induced Self-Assembling and Gelation of PLGA-PEG-PLGA Triblock Copolymer in Aqueous Solutions. Macromol Biosci 2016; 16:1838-1852. [DOI: 10.1002/mabi.201600277] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2016] [Revised: 08/19/2016] [Indexed: 11/07/2022]
Affiliation(s)
- Neda Khameh Khorshid
- Department of Chemistry; University of Oslo; P.O. Box 1033 Blindern N-0315 Oslo Norway
| | - Kaizheng Zhu
- Department of Chemistry; University of Oslo; P.O. Box 1033 Blindern N-0315 Oslo Norway
| | - Kenneth D. Knudsen
- Department of Physics; Institute for Energy Technology; P. O. Box 40 N-2027 Kjeller Norway
| | - Sara Bekhradnia
- Department of Chemistry; University of Oslo; P.O. Box 1033 Blindern N-0315 Oslo Norway
| | - Sverre Arne Sande
- School of Pharmacy; Department of Pharmaceutics; University of Oslo; P.O. Box 1068 Blindern N-0316 Oslo Norway
| | - Bo Nyström
- Department of Chemistry; University of Oslo; P.O. Box 1033 Blindern N-0315 Oslo Norway
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Nyström B, Svensson E, Larsson S, Schillberg B, Mörk A, Taube A. A small group Whiplash-Associated-Disorders (WAD) patients with central neck pain and movement induced stabbing pain, the painful segment determined by mechanical provocation: Fusion surgery was superior to multimodal rehabilitation in a randomized trial. Scand J Pain 2016; 12:33-42. [DOI: 10.1016/j.sjpain.2016.03.003] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2015] [Revised: 03/01/2016] [Accepted: 03/07/2016] [Indexed: 10/22/2022]
Abstract
Graphical Abstract
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Affiliation(s)
- Bo Nyström
- Clinic of Spinal Surgery , Löt, SE-64594 Strängnäs , Sweden
| | | | - Svante Larsson
- Clinic of Medical Rehabilitation , Karolinska Hospital , Stockholm , Sweden
| | | | - Ann Mörk
- Clinic of Spinal Surgery , Löt, SE-64594 Strängnäs , Sweden
| | - Adam Taube
- Dept. of Statistics , Uppsala University , SE-75120 Uppsala , Sweden
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Plazzotta B, Diget JS, Zhu K, Nyström B, Pedersen JS. Small-angle X-ray scattering as a useful supplementary technique to determine molecular masses of polyelectrolytes in solution. ACTA ACUST UNITED AC 2016; 54:1913-1917. [PMID: 27840558 PMCID: PMC5094539 DOI: 10.1002/polb.24107] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2016] [Accepted: 05/24/2016] [Indexed: 11/11/2022]
Abstract
Determination of molecular masses of charged polymers is often nontrivial and most methods have their drawbacks. For polyelectrolytes, a new possibility for the determination of number-average molecular masses is represented by small-angle X-ray scattering (SAXS) which allows fast determinations with a 10% accuracy. This is done by relating the mass to the position of a characteristic peak feature which arises in SAXS due to the local ordering caused by charge-repulsions between polyelectrolytes. Advantages of the technique are the simplicity of data analysis, the independency from polymer architecture, and the low sample and time consumption. The method was tested on polyelectrolytes of various structures and chemical compositions, and the results were compared with those obtained from more conventional techniques, such as asymmetric flow field-flow fractionation, gel permeation chromatography, and classical SAXS data analysis, showing that the accuracy of the suggested method is similar to that of the other techniques. © 2016 The Authors. Journal of Polymer Science Part B: Polymer Physics Published by Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2016, 54, 1913-1917.
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Affiliation(s)
- Beatrice Plazzotta
- Interdisciplinary Nanoscience Center (iNANO) and Department of Chemistry Aarhus University Gustav Wieds Vej 14 Aarhus C 8000 Denmark
| | | | - Kaizheng Zhu
- Department of Chemistry University of Oslo P. O. Box 1033 Blindern Oslo N-0315 Norway
| | - Bo Nyström
- Department of Chemistry University of Oslo P. O. Box 1033 Blindern Oslo N-0315 Norway
| | - Jan Skov Pedersen
- Interdisciplinary Nanoscience Center (iNANO) and Department of Chemistry Aarhus University Gustav Wieds Vej 14 Aarhus C 8000 Denmark
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40
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Abstract
Polylysine dendrons with lipid tails prepared by divergent solid-phase synthesis showed self-assembling properties in aqueous solutions.
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Affiliation(s)
- Sahar Mirsharghi
- National Veterinary Institute
- Technical University of Denmark (DTU)
- DK-1870 Frederiksberg C
- Denmark
| | - Kenneth D. Knudsen
- Department of Physics
- Institute for Energy Technology
- N-2027 Kjeller
- Norway
| | - Shahla Bagherifam
- Department of Chemistry
- University of Oslo
- Oslo
- Norway
- Department of Biology
| | - Bo Nyström
- Department of Chemistry
- University of Oslo
- Oslo
- Norway
| | - Ulrik Boas
- National Veterinary Institute
- Technical University of Denmark (DTU)
- DK-1870 Frederiksberg C
- Denmark
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41
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Isapour G, Lund R, Zhu K, Quan Z, Knudsen KD, Nyström B. Schizophrenic micellization in aqueous solutions of the pH- and temperature responsive pentablock terpolymer PDEAEMAx-b-PNIPAAMy-b-PEGz-b-PNIPAAMy-b-PDEAEMAx. Eur Polym J 2015. [DOI: 10.1016/j.eurpolymj.2015.07.007] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Bekhradnia S, Naz I, Lund R, Effenberg C, Appelhans D, Sande SA, Nyström B. Characterization of oligosaccharide-functionalized hyperbranched poly(ethylene imine) and their complexes with retinol in aqueous solution. J Colloid Interface Sci 2015. [PMID: 26218197 DOI: 10.1016/j.jcis.2015.07.042] [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] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
Structure, internal density distribution, and size of hyperbranched poly(ethylene imine) (PEI) functionalized with various amounts of maltose (PEI-Mal) in phosphate buffer were studied by small angle X-ray scattering (SAXS) and dynamic light scattering (DLS). The value of pH was varied in the range from 3 to 9. Virtually no effect of pH on the nanostructure was found in this interval. The SAXS results revealed a broad segmental radial density distribution, i.e. a "fluffy" globular structure rather than a distinct core-shell structure with a high-density compact core and a low-density corona. This suggests that the maltose units are rather evenly distributed both in the interior and on the surface of the species with a PEI-core of molar mass of 25,000g/mol. The DLS measurements showed that the overall size of the PEI-Mal derivatives increased as the number of maltose units in the PEI-Mal structures rises. The interaction of the hydrophobic model drug retinol with PEI or PEI-Mal derivatives was also investigated. The UV-visible spectroscopy results disclosed that the solubility of retinol in the phosphate buffer is very poor and it takes a very long time to solubilize retinol. Moreover, retinol induces aggregation of dendritic glycopolymers where the growth of aggregates occurs continuously over several days and then remains virtually constant.
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Affiliation(s)
- Sara Bekhradnia
- Department of Chemistry, University of Oslo, P.O. Box 1033, Blindern, N-0315 Oslo, Norway; School of Pharmacy, Department of Pharmaceutics, University of Oslo, P.O. Box 1068, Blindern, N-0316 Oslo, Norway.
| | - Iram Naz
- Department of Chemistry, University of Oslo, P.O. Box 1033, Blindern, N-0315 Oslo, Norway; School of Pharmacy, Department of Pharmaceutics, University of Oslo, P.O. Box 1068, Blindern, N-0316 Oslo, Norway.
| | - Reidar Lund
- Department of Chemistry, University of Oslo, P.O. Box 1033, Blindern, N-0315 Oslo, Norway.
| | - Christiane Effenberg
- Leibni-Institut für Polymerforschung Dresden e.V., Hohe Strasse 6, D-01069 Dresden, Germany.
| | - Dietmar Appelhans
- Leibni-Institut für Polymerforschung Dresden e.V., Hohe Strasse 6, D-01069 Dresden, Germany.
| | - Sverre Arne Sande
- School of Pharmacy, Department of Pharmaceutics, University of Oslo, P.O. Box 1068, Blindern, N-0316 Oslo, Norway.
| | - Bo Nyström
- Department of Chemistry, University of Oslo, P.O. Box 1033, Blindern, N-0315 Oslo, Norway.
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Bekhradnia S, Diget JS, Zinn T, Zhu K, Sande SA, Nyström B, Lund R. Charged Star Diblock Copolymers in Dilute Solutions: Synthesis, Structure, and Chain Conformations. Macromolecules 2015. [DOI: 10.1021/ma502488u] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- Sara Bekhradnia
- Department
of Chemistry, University of Oslo, P.O. Box 1033, Blindern, N-0315 Oslo, Norway
- Department
of Pharmacy, University of Oslo, P.O. Box 1068, Blindern, N-0316 Oslo, Norway
| | - Jakob Stensgaard Diget
- Department
of Chemistry, University of Oslo, P.O. Box 1033, Blindern, N-0315 Oslo, Norway
| | - Thomas Zinn
- Department
of Chemistry, University of Oslo, P.O. Box 1033, Blindern, N-0315 Oslo, Norway
| | - Kaizheng Zhu
- Department
of Chemistry, University of Oslo, P.O. Box 1033, Blindern, N-0315 Oslo, Norway
| | - Sverre Arne Sande
- Department
of Pharmacy, University of Oslo, P.O. Box 1068, Blindern, N-0316 Oslo, Norway
| | - Bo Nyström
- Department
of Chemistry, University of Oslo, P.O. Box 1033, Blindern, N-0315 Oslo, Norway
| | - Reidar Lund
- Department
of Chemistry, University of Oslo, P.O. Box 1033, Blindern, N-0315 Oslo, Norway
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Lyngsø J, Al-Manasir N, Behrens MA, Zhu K, Kjøniksen AL, Nyström B, Pedersen JS. Small-Angle X-ray Scattering Studies of Thermoresponsive Poly(N-isopropylacrylamide) Star Polymers in Water. Macromolecules 2015. [DOI: 10.1021/acs.macromol.5b00057] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Affiliation(s)
- Jeppe Lyngsø
- Interdisciplinary
Nanoscience Center (iNANO) and Department of Chemistry, Aarhus University, Gustav Wieds Vej 14, DK-8000 Aarhus C, Denmark
| | - Nodar Al-Manasir
- Department
of Chemistry, University of Oslo, P.O. Box 1033, Blindern, N-0315 Oslo, Norway
| | - Manja A. Behrens
- Interdisciplinary
Nanoscience Center (iNANO) and Department of Chemistry, Aarhus University, Gustav Wieds Vej 14, DK-8000 Aarhus C, Denmark
| | - Kaizheng Zhu
- Department
of Chemistry, University of Oslo, P.O. Box 1033, Blindern, N-0315 Oslo, Norway
| | - Anna-Lena Kjøniksen
- Department
of Chemistry, University of Oslo, P.O. Box 1033, Blindern, N-0315 Oslo, Norway
- Faculty
of Engineering, Østfold University College, P.O. Box 700, N-1757 Halden, Norway
| | - Bo Nyström
- Department
of Chemistry, University of Oslo, P.O. Box 1033, Blindern, N-0315 Oslo, Norway
| | - Jan Skov Pedersen
- Interdisciplinary
Nanoscience Center (iNANO) and Department of Chemistry, Aarhus University, Gustav Wieds Vej 14, DK-8000 Aarhus C, Denmark
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Abstract
AbstractApart from the special mechanisms for spread of IV device and respiratory equipment-related infections, the mechanisms for spread of infections in the intensive care unit (ICU) are no different from other areas of the hospital. Control of transmission must emphasize the necessity of blocking the contact and airborne routes of spread.Hand disinfection with an alcoholic preparation and the use of patient-bound gowns for all direct patient contact are efficient measures against contact spread of infections.Airborne spread is best reduced by nursing patients in one-patient rooms with doors closed. A substantial part of the beds should be in such rooms. However, they are of little value if basic barrier nursing techniques are neglected. An ante-room to the one-patient room is practical for hand disinfection, gowning, etc., and if ventilated, offers added protection against airborne spread.Barriers against transmission of microorganisms must be created between patient rooms. Since basic barrier nursing techniques are the determining factors for infection control, the need for adequate numbers of well-trained and well-educated staff cannot be overestimated.
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Asad Ayoubi M, Almdal K, Zhu K, Nyström B, Olsson U, Piculell L. Self-assembly of block copolymer-based ionic supramolecules based upon multi-tail amphiphiles. RSC Adv 2015. [DOI: 10.1039/c5ra03220b] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Using synchrotron small angle X-ray scattering (SAXS), self-assembly of ionic supramolecules based upon diblock copolymers of poly(styrene)-b-poly(methacrylic acid) and multi-tail (2- or 4-tail) alkyl quaternary ammonium amphiphiles is investigated.
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Affiliation(s)
- M. Asad Ayoubi
- Division of Physical Chemistry
- Center for Chemistry and Chemical Engineering
- Lund University
- SE-22 100 Lund
- Sweden
| | - K. Almdal
- Department of Micro- and Nanotechnology
- Technical University of Denmark
- DK-2800 Kongens Lyngby
- Denmark
| | - K. Zhu
- Department of Chemistry
- University of Oslo
- N-0315 Oslo
- Norway
| | - B. Nyström
- Department of Chemistry
- University of Oslo
- N-0315 Oslo
- Norway
| | - U. Olsson
- Division of Physical Chemistry
- Center for Chemistry and Chemical Engineering
- Lund University
- SE-22 100 Lund
- Sweden
| | - L. Piculell
- Division of Physical Chemistry
- Center for Chemistry and Chemical Engineering
- Lund University
- SE-22 100 Lund
- Sweden
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Kahnamouei F, Zhu K, Lund R, Knudsen KD, Nyström B. Self-assembly of a hydrophobically end-capped charged amphiphilic triblock copolymer: effects of temperature and salinity. RSC Adv 2015. [DOI: 10.1039/c5ra07657a] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
This study elucidates the intricate interplay between hydrophobic and electrostatic interactions in aqueous solutions of a responsive charged triblock copolymer.
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Affiliation(s)
| | - Kaizheng Zhu
- Department of Chemistry
- University of Oslo
- N-0315 Oslo
- Norway
| | - Reidar Lund
- Department of Chemistry
- University of Oslo
- N-0315 Oslo
- Norway
| | - Kenneth D. Knudsen
- Department of Physics
- Institute for Energy Technology
- N-2027 Kjeller
- Norway
| | - Bo Nyström
- Department of Chemistry
- University of Oslo
- N-0315 Oslo
- Norway
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Bagherifam S, Griffiths GW, Mælandsmo GM, Nyström B, Hasirci V, Hasirci N. Poly(sebacic anhydride) nanocapsules as carriers: effects of preparation parameters on properties and release of doxorubicin. J Microencapsul 2014; 32:166-74. [PMID: 25323326 DOI: 10.3109/02652048.2014.973073] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Poly(sebacic anhydride) (PSA) is a promising polymer for the production of drug delivery vehicles. The aim of this work is to study the effect of preparation parameters on the quality of the nanoparticles. In this study, doxorubicin (DOX)-loaded PSA nanocapsules were prepared by an emulsion method. Effects of factors such as type of organic solvent, co-solute (surfactant) and its concentration on drug-loading efficiency, particle size and size distribution, morphology and release profile were examined to gain insight in the preparation and stability of nanostructures. Particles with sizes in the range of 218-1198 nm were prepared. The smallest particles with a narrow size distribution were prepared by using polyvinyl alcohol as a co-solute and dichloromethane as a solvent. Efficiency and intracellular release of doxorubicin from the formulated particles were studied on MDA-MB-231 cells. It was observed that DOX-loaded PSA particles can diffuse into the cells and intracellular antitumour activity is directly related to the released amount of drug from the PSA nanocapsules.
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Affiliation(s)
- Shahla Bagherifam
- Graduate Department of Polymer Science and Technology, Middle East Technical University , Ankara , Turkey
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50
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Kjøniksen AL, Calejo MT, Zhu K, Nyström B, Sande SA. Stabilization of Pluronic Gels by Hydrophobically Modified Hydroxyethylcellulose. INT J POLYM MATER PO 2014. [DOI: 10.1080/00914037.2014.886245] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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