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Development and characterization of azadirachta indica gum-poly(2-hydroxyethyl methacrylate) crosslinked co-polymeric hydrogels for drug delivery applications. Chem Phys Lett 2022. [DOI: 10.1016/j.cplett.2022.139401] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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2
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Li G, Varga I, Kardos A, Dobryden I, Claesson PM. Nanoscale Mechanical Properties of Core-Shell-like Poly-NIPAm Microgel Particles: Effect of Temperature and Cross-Linking Density. J Phys Chem B 2021; 125:9860-9869. [PMID: 34428041 DOI: 10.1021/acs.jpcb.1c04173] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Poly-NIPAm microgel particles with two different cross-linking densities were prepared with the classical batch polymerization process. These particles were adsorbed onto modified silica surfaces, and their nanomechanical properties were measured by means of atomic force microscopy. It was found that these particles have a hard core-soft shell structure both below and above the volume transition temperature. The core-shell-like structure appears due to a higher reaction rate of the cross-linker compared to that of the monomer, leading to depletion of cross-linker in the shell region. The microgel beads with lower average cross-linking density were found to be less stiff below the volume transition temperature than the microgel with higher cross-linking density. Increasing the temperature further to just above the volume transition temperature led to lower stiffness of the more highly cross-linked microgel compared to its less cross-linked counterpart. This effect is explained with the more gradual deswelling with temperature for the more cross-linked microgel particles. This phenomenon was confirmed by dynamic light scattering measurements in the bulk phase, which showed that the larger cross-linking density microgel showed a more gradual collapse in aqueous solution as the temperature was increased.
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Affiliation(s)
- Gen Li
- Biotechnology and Health, Department of Chemistry, Division of Surface and Corrosion Science, School of Engineering Sciences in Chemistry, KTH Royal Institute of Technology, Drottning Kristinas väg 51, SE-100 44 Stockholm, Sweden
| | - Imre Varga
- Institute of Chemistry, Eötvös Loránd University, Pázmány P. s. 1/A, 1117 Budapest, Hungary.,Department of Chemistry, University J. Selyeho, 945 01 Komarno, Slovakia
| | - Attila Kardos
- Institute of Chemistry, Eötvös Loránd University, Pázmány P. s. 1/A, 1117 Budapest, Hungary.,Department of Chemistry, University J. Selyeho, 945 01 Komarno, Slovakia
| | - Illia Dobryden
- Biotechnology and Health, Department of Chemistry, Division of Surface and Corrosion Science, School of Engineering Sciences in Chemistry, KTH Royal Institute of Technology, Drottning Kristinas väg 51, SE-100 44 Stockholm, Sweden.,Department of Engineering Sciences and Mathematics, Division of Materials Science, Luleå University of Technology, 97187 Luleå, Sweden
| | - Per M Claesson
- Biotechnology and Health, Department of Chemistry, Division of Surface and Corrosion Science, School of Engineering Sciences in Chemistry, KTH Royal Institute of Technology, Drottning Kristinas väg 51, SE-100 44 Stockholm, Sweden.,Division of Bioscience and Materials, RISE Research Institutes of Sweden, Box 5607, SE 114 86 Stockholm, Sweden
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3
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Li G, Varga I, Kardos A, Dobryden I, Claesson PM. Temperature-Dependent Nanomechanical Properties of Adsorbed Poly-NIPAm Microgel Particles Immersed in Water. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:1902-1912. [PMID: 33502872 PMCID: PMC7879429 DOI: 10.1021/acs.langmuir.0c03386] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/25/2020] [Revised: 01/15/2021] [Indexed: 05/24/2023]
Abstract
The temperature dependence of nanomechanical properties of adsorbed poly-NIPAm microgel particles prepared by a semibatch polymerization process was investigated in an aqueous environment via indentation-based atomic force microscopy (AFM) methods. Poly-NIPAm microgel particles prepared by the classical batch process were also characterized for comparison. The local mechanical properties were measured between 26 and 35 °C, i.e., in the temperature range of the volume transition. Two different AFM tips with different shapes and end radii were utilized. The nanomechanical properties measured by the two kinds of tips showed a similar temperature dependence of the nanomechanical properties, but the actual values were found to depend on the size of the tip. The results suggest that the semibatch synthesis process results in the formation of more homogeneous microgel particles than the classical batch method. The methodological approach reported in this work is generally applicable to soft surface characterization in situ.
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Affiliation(s)
- Gen Li
- School
of Engineering Sciences in Chemistry, Biotechnology and Health, Department
of Chemistry, Division of Surface and Corrosion Science, KTH Royal Institute of Technology, Drottning Kristinas väg 51, SE-100 44 Stockholm, Sweden
| | - Imre Varga
- Institute
of Chemistry, Eötvös Loránd
University, Pázmány P. s. 1/A, 1117 Budapest, Hungary
- Department
of Chemistry, University J. Selyeho, 945 01 Komarno, Slovakia
| | - Attila Kardos
- Institute
of Chemistry, Eötvös Loránd
University, Pázmány P. s. 1/A, 1117 Budapest, Hungary
- Department
of Chemistry, University J. Selyeho, 945 01 Komarno, Slovakia
| | - Illia Dobryden
- School
of Engineering Sciences in Chemistry, Biotechnology and Health, Department
of Chemistry, Division of Surface and Corrosion Science, KTH Royal Institute of Technology, Drottning Kristinas väg 51, SE-100 44 Stockholm, Sweden
- Department
of Engineering Sciences and Mathematics, Division of Materials Science, Luleå University of Technology, 97187 Luleå, Sweden
| | - Per M. Claesson
- School
of Engineering Sciences in Chemistry, Biotechnology and Health, Department
of Chemistry, Division of Surface and Corrosion Science, KTH Royal Institute of Technology, Drottning Kristinas väg 51, SE-100 44 Stockholm, Sweden
- Division
of Bioscience and Materials, RISE Research
Institutes of Sweden, Box 5607, SE 114 86 Stockholm, Sweden
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4
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Yan H, Hjorth M, Winkeljann B, Dobryden I, Lieleg O, Crouzier T. Glyco-Modification of Mucin Hydrogels to Investigate Their Immune Activity. ACS APPLIED MATERIALS & INTERFACES 2020; 12:19324-19336. [PMID: 32301325 PMCID: PMC7304668 DOI: 10.1021/acsami.0c03645] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/25/2020] [Accepted: 04/03/2020] [Indexed: 05/07/2023]
Abstract
Mucins are multifunctional glycosylated proteins that are increasingly investigated as building blocks of novel biomaterials. An attractive feature is their ability to modulate the immune response, in part by engaging with sialic acid binding receptors on immune cells. Once assembled into hydrogels, bovine submaxillary mucins (Muc gels) were shown to modulate the recruitment and activation of immune cells and avoid fibrous encapsulation in vivo. However, nothing is known about the early immune response to Muc gels. This study characterizes the response of macrophages, important orchestrators of the material-mediated immune response, over the first 7 days in contact with Muc gels. The role of mucin-bound sialic acid sugar residues was investigated by first enzymatically cleaving the sugar and then assembling the mucin variants into covalently cross-linked hydrogels with rheological and surface nanomechanical properties similar to nonmodified Muc gels. Results with THP-1 and human primary peripheral blood monocytes derived macrophages showed that Muc gels transiently activate the expression of both pro-inflammatory and anti-inflammatory cytokines and cell surface markers, for most makers with a maximum on the first day and loss of the effect after 7 days. The activation was sialic acid-dependent for a majority of the markers followed. The pattern of gene expression, protein expression, and functional measurements did not strictly correspond to M1 or M2 macrophage phenotypes. This study highlights the complex early events in macrophage activation in contact with mucin materials and the importance of sialic acid residues in such a response. The enzymatic glyco-modulation of Muc gels appears as a useful tool to help understand the biological functions of specific glycans on mucins which can further inform on their use in various biomedical applications.
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Affiliation(s)
- Hongji Yan
- Division of Glycoscience,
Department of Chemistry, School of Engineering Sciences in Chemistry,
Biotechnology and Health, KTH, Royal Institute
of Technology, AlbaNova University Center, 106 91 Stockholm, Sweden
| | - Morgan Hjorth
- Division of Glycoscience,
Department of Chemistry, School of Engineering Sciences in Chemistry,
Biotechnology and Health, KTH, Royal Institute
of Technology, AlbaNova University Center, 106 91 Stockholm, Sweden
| | - Benjamin Winkeljann
- Department of Mechanical Engineering and Munich School of Bioengineering, Technical University of Munich, Boltzmannstrasse 11, 85748 Garching, Germany
| | - Illia Dobryden
- Division of Surface and Corrosion Science, Department of Chemistry,
School of Engineering Sciences in Chemistry, Biotechnology and Health, KTH Royal Institute of Technology, Drottning Kristinas väg 51, 10044 Stockholm, Sweden
| | - Oliver Lieleg
- Department of Mechanical Engineering and Munich School of Bioengineering, Technical University of Munich, Boltzmannstrasse 11, 85748 Garching, Germany
| | - Thomas Crouzier
- Division of Glycoscience,
Department of Chemistry, School of Engineering Sciences in Chemistry,
Biotechnology and Health, KTH, Royal Institute
of Technology, AlbaNova University Center, 106 91 Stockholm, Sweden
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Khodeir M, Jia H, Antoun S, Friebe C, Schubert US, Lu Y, Van Ruymbeke E, Gohy J. Synthesis and characterization of hydrogels containing
redox‐responsive
2,2,6,6
‐
tetramethylpiperidinyloxy
methacrylate and
thermoresponsive
N
‐isopropylacrylamide
. JOURNAL OF POLYMER SCIENCE 2020. [DOI: 10.1002/pol.20200172] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Miriam Khodeir
- Institute of Condensed Matter and Nanosciences (IMCN), Bio and Soft Matter (BSMA) Université Catholique de Louvain (UCL) Louvain‐la‐Neuve Belgium
| | - He Jia
- Institute of Condensed Matter and Nanosciences (IMCN), Bio and Soft Matter (BSMA) Université Catholique de Louvain (UCL) Louvain‐la‐Neuve Belgium
| | - Sayed Antoun
- Department of Chemistry, Faculty of Science Section III ‐ North Campus‐Tripoli Lebanese University (UL) Lebanon
| | - Christian Friebe
- Laboratory of Organic and Macromolecular Chemistry (IOMC) Friedrich Schiller Universität Jena Jena Germany
| | - Ulrich S. Schubert
- Laboratory of Organic and Macromolecular Chemistry (IOMC) Friedrich Schiller Universität Jena Jena Germany
| | - Yan Lu
- EM‐IEES Institute for Electrochemical Energy Storage Helmholtz‐Zentrum Berlin für Materialien und Energie Berlin Germany
- Institute of Chemistry University of Potsdam Potsdam Germany
| | - Evelyne Van Ruymbeke
- Institute of Condensed Matter and Nanosciences (IMCN), Bio and Soft Matter (BSMA) Université Catholique de Louvain (UCL) Louvain‐la‐Neuve Belgium
| | - Jean‐François Gohy
- Institute of Condensed Matter and Nanosciences (IMCN), Bio and Soft Matter (BSMA) Université Catholique de Louvain (UCL) Louvain‐la‐Neuve Belgium
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