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Dijkstra DJ, Liem SIE, van Leeuwen NM, Fehres CM, de Vries-Bouwstra JK, Trouw LA. Anti-C1q autoantibodies may not serve as an adequate biomarker for lung manifestations in systemic sclerosis: a single-centre, cross-sectional study. Br J Dermatol 2021; 185:657-658. [PMID: 33913512 PMCID: PMC8453845 DOI: 10.1111/bjd.20412] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2021] [Revised: 04/19/2021] [Accepted: 04/23/2021] [Indexed: 12/04/2022]
Affiliation(s)
- D J Dijkstra
- Department of Immunology, Leiden University Medical Center, Leiden, the Netherlands
| | - S I E Liem
- Department of Rheumatology, Leiden University Medical Center, Leiden, the Netherlands
| | - N M van Leeuwen
- Department of Rheumatology, Leiden University Medical Center, Leiden, the Netherlands
| | - C M Fehres
- Department of Rheumatology, Leiden University Medical Center, Leiden, the Netherlands
| | - J K de Vries-Bouwstra
- Department of Rheumatology, Leiden University Medical Center, Leiden, the Netherlands
| | - L A Trouw
- Department of Immunology, Leiden University Medical Center, Leiden, the Netherlands
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Lubbers R, Oostindie SC, Dijkstra DJ, Parren PWHI, Verheul MK, Abendstein L, Sharp TH, de Ru A, Janssen GMC, van Veelen PA, van den Bremer ETJ, Bleijlevens B, de Kreuk BJ, Beurskens FJ, Trouw LA. Carbamylation reduces the capacity of IgG for hexamerization and complement activation. Clin Exp Immunol 2019; 200:1-11. [PMID: 31853959 PMCID: PMC7066385 DOI: 10.1111/cei.13411] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [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] [Accepted: 12/11/2019] [Indexed: 02/06/2023] Open
Abstract
Carbamylation is a post‐translational modification that can be detected on a range of proteins, including immunoglobulin (Ig)G, in several clinical conditions. Carbamylated IgG (ca‐IgG) was reported to lose its capacity to trigger complement activation, but the mechanism remains unclear. Because C1q binds with high affinity to hexameric IgG, we analyzed whether carbamylation of IgG affects binding of C1q, hexamerization and complement‐dependent cytotoxicity (CDC). Synovial tissues of rheumatoid arthritis (RA) patients were analyzed for the presence of ca‐IgG in vivo. Synovial tissues from RA patients were analyzed for the presence of ca‐IgG using mass spectrometry (MS). Monomeric or hexameric antibodies were carbamylated in vitro and quality in solution was controlled. The capacity of ca‐IgG to activate complement was analyzed in enzyme‐linked immunosorbent (ELISAs) and cellular CDC assays. Using MS, we identified ca‐IgG to be present in the joints of RA patients. Using in vitro carbamylated antibodies, we observed that ca‐IgG lost its capacity to activate complement in both solid‐phase and CDC assays. Mixing ca‐IgG with non‐modified IgG did not result in effective inhibition of complement activation by ca‐IgG. Carbamylation of both monomeric IgG and preformed hexameric IgG greatly impaired the capacity to trigger complement activation. Furthermore, upon carbamylation, the preformed hexameric IgG dissociated into monomeric IgG in solution, indicating that carbamylation influences both hexamerization and C1q binding. In conclusion, ca‐IgG can be detected in vivo and has a strongly reduced capacity to activate complement which is, in part, mediated through a reduced ability to form hexamers.
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Affiliation(s)
- R Lubbers
- Department Rheumatology, Leiden University Medical Center, Leiden, the Netherlands
| | - S C Oostindie
- Genmab, Utrecht, the Netherlands.,Department of Immunohematology and Blood Transfusion, Leiden University Medical Center, Leiden, the Netherlands
| | - D J Dijkstra
- Department of Immunohematology and Blood Transfusion, Leiden University Medical Center, Leiden, the Netherlands
| | - P W H I Parren
- Department of Immunohematology and Blood Transfusion, Leiden University Medical Center, Leiden, the Netherlands.,Lava Therapeutics, Utrecht, the Netherlands
| | - M K Verheul
- Department Rheumatology, Leiden University Medical Center, Leiden, the Netherlands
| | - L Abendstein
- Department of Cell and Chemical Biology, Leiden University Medical Center, Leiden, the Netherlands
| | - T H Sharp
- Department of Cell and Chemical Biology, Leiden University Medical Center, Leiden, the Netherlands
| | - A de Ru
- Center for Proteomics and Metabolomics, Leiden University Medical Center, Leiden, the Netherlands
| | - G M C Janssen
- Center for Proteomics and Metabolomics, Leiden University Medical Center, Leiden, the Netherlands
| | - P A van Veelen
- Center for Proteomics and Metabolomics, Leiden University Medical Center, Leiden, the Netherlands
| | | | | | | | | | - L A Trouw
- Department Rheumatology, Leiden University Medical Center, Leiden, the Netherlands.,Department of Immunohematology and Blood Transfusion, Leiden University Medical Center, Leiden, the Netherlands
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Affiliation(s)
| | - Thomas Brock
- Coatings – Chemistry and Technology Huerth Germany
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Lenzi V, Driest PJ, Dijkstra DJ, Ramos MM, Marques LS. Investigation on the intermolecular interactions in aliphatic isocyanurate liquids: revealing the importance of dispersion. J Mol Liq 2019. [DOI: 10.1016/j.molliq.2019.01.165] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Driest PJ, Dijkstra DJ, Stamatialis D, Grijpma DW. The Trimerization of Isocyanate-Functionalized Prepolymers: An Effective Method for Synthesizing Well-Defined Polymer Networks. Macromol Rapid Commun 2019; 40:e1800867. [PMID: 30817042 DOI: 10.1002/marc.201800867] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [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: 11/28/2018] [Revised: 02/15/2019] [Indexed: 11/06/2022]
Abstract
For the study of polymer networks, having access to polymer networks with a controlled and well-defined microscopic network structure is of great importance. However, typically, such networks are difficult to synthesize. In this work, a simple, effective, and widely applicable method is presented for synthesizing polymer networks with a well-defined network structure. This is done by the functionalization of polymeric diols using a diisocyanate, and their subsequent trimerization. Using hexamethylene diisocyanate and hydroxyl-group-terminated poly(ε-caprolactone) and poly(ethylene glycol), it is shown that both hydrophobic and hydrophilic poly(urethane-isocyanurate) networks with a well-defined network structure can readily be synthesized. By using in situ infrared spectroscopy, it is shown that the trimerization of isocyanate endgroups is clearly the predominant reaction pathway of network formation, supporting the proposed mechanism and network structure. The resulting networks possess excellent mechanical properties in both the dry and in the wet state.
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Affiliation(s)
- Piet J Driest
- Covestro Deutschland AG, CAS Global R&D, Kaiser-Wilhelm-Allee 60, 51373, Leverkusen, Germany.,Technical Medical Centre, Faculty of Science and Technology, Department of Biomaterials Science and Technology, University of Twente, P.O. Box 217, 7500, AE Enschede, The Netherlands
| | - Dirk J Dijkstra
- Covestro Deutschland AG, CAS Global R&D, Kaiser-Wilhelm-Allee 60, 51373, Leverkusen, Germany
| | - Dimitrios Stamatialis
- Technical Medical Centre, Faculty of Science and Technology, Department of Biomaterials Science and Technology, University of Twente, P.O. Box 217, 7500, AE Enschede, The Netherlands
| | - Dirk W Grijpma
- Technical Medical Centre, Faculty of Science and Technology, Department of Biomaterials Science and Technology, University of Twente, P.O. Box 217, 7500, AE Enschede, The Netherlands
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Lenzi V, Driest PJ, Dijkstra DJ, Ramos MMD, Marques LSA. GAFF-IC: realistic viscosities for isocyanate molecules with a GAFF-based force field. Molecular Simulation 2018. [DOI: 10.1080/08927022.2018.1554902] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Veniero Lenzi
- Department/Centre of Physics, University of Minho, Braga, Portugal
| | - Piet J. Driest
- Covestro Deutschland AG, CAS-Global R&D, Leverkusen, Germany
- Department of Biomaterials Science and Technology, MIRA Institute for Biomedical Technology and Technical Medicine, University of Twente, Enschede, Netherlands
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Bunge CA, Beckers M, Dijkstra DJ. In Focus on the Fiber Society Spring Conference 2017. POLYM INT 2018. [DOI: 10.1002/pi.5589] [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: 11/10/2022]
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Laun M, Auhl D, Brummer R, Dijkstra DJ, Gabriel C, Mangnus MA, Rüllmann M, Zoetelief W, Handge UA. Guidelines for checking performance and verifying accuracy of rotational rheometers: viscosity measurements in steady and oscillatory shear (IUPAC Technical Report). PURE APPL CHEM 2014. [DOI: 10.1515/pac-2013-0601] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
The paper addresses techniques for checking the performance of rotational rheometers with cone–plate, plate–plate, or concentric cylinder geometry. We focus on the determination of the viscosity as a function of the shear rate and of the magnitude of the complex viscosity as a function of the angular frequency. After summarizing the relevant definitions and test modes, we show examples of measurements in the linear viscoelastic range, and applications of the Cox–Merz relationship. Sources of reference fluids with defined viscosities are presented, and their use in tests for verification of accuracy is demonstrated. Relevant issues, predominantly for Newtonian reference liquids, are the exploration of measurement limits, related either to the shear rate range or to reliably accessible viscosity levels. Viscoelastic reference samples are also discussed. Prerequisites for sample preparation and loading are addressed. In particular, we present recommendations based on experience from various laboratories. Finally, we discuss the problem of temperature calibration, presenting techniques that allow the determination of the true sample temperature for a given set temperature of the rheometer. This paper summarizes contributions from various industrial and academic laboratories.
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Clauß S, Dijkstra DJ, Gabriel J, Karbach A, Matner M, Meckel W, Niemz P. Influence of the filler material on the thermal stability of one-component moisture-curing polyurethane adhesives. J Appl Polym Sci 2011. [DOI: 10.1002/app.35223] [Citation(s) in RCA: 13] [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: 11/06/2022]
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Handge UA, Galeski A, Kim SC, Dijkstra DJ, Götz C, Fischer F, Lim GT, Altstädt V, Gabriel C, Weber M, Steininger H. Melt processing, mechanical, and fatigue crack propagation properties of reactively compatibilized blends of polyamide 6 and acrylonitrile-butadiene-styrene copolymer. J Appl Polym Sci 2011. [DOI: 10.1002/app.35055] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Georgieva K, Dijkstra DJ, Fricke H, Willenbacher N. Clogging of microchannels by nano-particles due to hetero-coagulation in elongational flow. J Colloid Interface Sci 2010; 352:265-77. [PMID: 20851405 DOI: 10.1016/j.jcis.2010.08.065] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2010] [Revised: 08/23/2010] [Accepted: 08/25/2010] [Indexed: 10/19/2022]
Abstract
We have investigated the phenomenon of flow-induced aggregation in highly concentrated colloidal dispersions exposed to strongly converging flow fields. This phenomenon is relevant not only for classical technical operations like coating, pumping or filtration, but also for the application of concentrated suspensions in upcoming processing technologies based on microfluidic devices. A ring-slit device (gap height 10-25 μm), which allows for a variation of flow kinematics in a wide range, has been developed in order to investigate this phenomenon. Various polymer dispersions with different particle surface properties have been used as model systems. Our experiments exclude, that channel clogging is due to retention of pre-existing aggregates, fouling or hydrodynamic bridging. Instead, we demonstrate that clogging of the microchannel is induced by hetero-coagulation between primary colloidal particles and micron-sized impurities present at concentrations on the order of 100-1000 ppm. Clogging can occur even if the diameter of these impurities is less than a tenth of the gap height. Aggregation takes place in the converging flow field at the channel entrance, but not in the shear field within the slit. It can be suppressed by appropriate stabilization of the primary particles.
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Affiliation(s)
- K Georgieva
- Institute of Mechanical Process Engineering and Mechanics, Karlsruhe Institute of Technology (KIT), 76131 Karlsruhe, Germany.
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Dijkstra DJ, Kiyomoto Y, Abe K, Tani T, Umemoto S. The Relationship between Rheological Properties and Spraying Behavior of Polymer Dispersions. ACTA ACUST UNITED AC 2007. [DOI: 10.1002/masy.200750450] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Affiliation(s)
- D J Dijkstra
- Department of Medical Genetics, University of Groningen, The Netherlands
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