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Bexborn, Fredrik
Publications (6 of 6) Show all publications
Shoravi, S., Olsson, G. D., Karlsson, B. C. G., Bexborn, F., Abghoui, Y., Hussain, J., . . . Nicholls, I. A. (2016). In silico screening of molecular imprinting prepolymerization systems: oseltamivir selective polymers through full-system molecular dynamics-based studies. Organic and biomolecular chemistry, 14(18), 4210-4219
Open this publication in new window or tab >>In silico screening of molecular imprinting prepolymerization systems: oseltamivir selective polymers through full-system molecular dynamics-based studies
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2016 (English)In: Organic and biomolecular chemistry, ISSN 1477-0520, E-ISSN 1477-0539, Vol. 14, no 18, p. 4210-4219Article in journal (Refereed) Published
Abstract [en]

All-component molecular dynamics studies were used to probe a library of oseltamivir molecularly imprinted polymer prepolymerization mixtures. Polymers included one of five functional monomers (acrylamide, hydroxyethylmethacrylate, methacrylic acid, 2-(triflouromethyl)acrylic acid, 4-vinylpyridine) and one of three porogens (acetonitrile, chloroform, methanol) combined with the crosslinking agent ethylene glycol dimethacrylate and initiator 2,2'-azobis(2-methylpropionitrile). Polymers were characterized by nitrogen gas sorption measurements and SEM, and affinity studies performed using radioligand binding in various media. In agreement with the predictions made from the simulations, polymers prepared in acetonitrile using either methacrylic or trifluoromethacrylic acid demonstrated the highest affinities for oseltamivir. Further, the ensemble of interactions observed in the methanol system provided an explanation for the morphology of polymers prepared in this solvent. The materials developed here offer potential for use in solid-phase extraction or for catalysis. The results illustrate the strength of this in silico strategy as a potential prognostic tool in molecularly imprinted polymer design.

National Category
Organic Chemistry
Research subject
Chemistry, Organic Chemistry
Identifiers
urn:nbn:se:lnu:diva-53319 (URN)10.1039/c6ob00305b (DOI)000375610600007 ()2-s2.0-84967333692 (Scopus ID)
Available from: 2016-06-10 Created: 2016-06-10 Last updated: 2018-11-02Bibliographically approved
Bexborn, F., Engberg, A. E., Sandholm, K., Mollnes, T. E., Hong, J. & Nilsson Ekdahl, K. (2009). Hirudin versus heparin for use in whole blood in vitro biocompatibility models. Journal of Biomedical Materials Research. Part A, 89A(4), 951-959
Open this publication in new window or tab >>Hirudin versus heparin for use in whole blood in vitro biocompatibility models
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2009 (English)In: Journal of Biomedical Materials Research. Part A, ISSN 1549-3296, E-ISSN 1552-4965, Vol. 89A, no 4, p. 951-959Article in journal (Refereed) Published
Abstract [en]

Background: Heparin has traditionally been a widely used anticoagulant in blood research, but has been shown to be inappropriate for work with the complement system because of its complement-interacting properties. In this work, we have compared the effects of heparin with those of the specific thrombin inhibitor hirudin on complement and blood cells in vitro.

Methods: Whole blood collected in the presence of hirudin (50 µg/mL) or heparin (1 IU/mL) was incubated in the slide chamber model. The plasma was analyzed for complement activation markers C3a and sC5b-9, and the polyvinylchloride test slides were stained for adhering cells. The integrity of the complement system was tested by incubating serum and hirudin-treated plasma in the presence of various activating agents.

Results: In contrast to heparin, the addition of hirudin generally preserved the complement reactivity, and complement activation in hirudin plasma closely resembled that in normal serum. Importantly, immunochemical staining of surface-bound cells demonstrated the inducible expression of tissue factor on bound monocytes from hirudin-treated blood, an effect that was completely abolished in heparin-treated blood.

Conclusion: Our results indicate that hirudin as an anticoagulant produces more physiological conditions than heparin, making hirudin well-suited for in vitro studies, especially those addressing the regulation of cellular processes.

Place, publisher, year, edition, pages
Hoboken, NJ, US: John Wiley & Sons Inc, 2009
Keywords
biocompatibility, complement, heparin, hirudin, whole blood models
National Category
Immunology in the medical area
Research subject
Natural Science, Biomedical Sciences
Identifiers
urn:nbn:se:hik:diva-2786 (URN)10.1002/jbm.a.32034 (DOI)
Available from: 2010-04-07 Created: 2010-02-22 Last updated: 2018-01-12Bibliographically approved
Engberg, A. E., Sandholm, K., Bexborn, F., Persson, J., Nilsson, B., Lindahl, G. & Nilsson Ekdahl, K. (2009). Inhibition of complement activation on a model biomaterial surface by streptococcal M protein-derived peptides. Biomaterials, 30(13), 2653-2659
Open this publication in new window or tab >>Inhibition of complement activation on a model biomaterial surface by streptococcal M protein-derived peptides
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2009 (English)In: Biomaterials, ISSN 0142-9612, E-ISSN 1878-5905, Vol. 30, no 13, p. 2653-2659Article in journal (Refereed) Published
Abstract [en]

The aim of this study was to evaluate a new approach to inhibit complement activation triggered by biomaterial surfaces in contact with blood. In order to inhibit complement activation initiated by the classical pathway (CP), we used streptococcal M protein-derived peptides that specifically bind human C4BP, an inhibitor of the CP. The peptides were used to coat polystyrene microtiter wells which served as a model biomaterial. The ability of coated peptides to bind C4BP and to attenuate complement activation via the CP (monitored as generation of fluid-phase C3a and binding of fragments of C3 and C4 to the surface) was investigated using diluted normal human serum, where complement activation by the AP is minimal, as well as serum from a patient lacking alternative pathway activation. Complement activation (all parameters) was significantly decreased in serum incubated in well surfaces coated with peptides. Total inhibition of complement activation was obtained at peptide coating concentrations as low as 1-5 mu g/mL. Successful use of Streptococcus-derived peptides shows that it is feasible to control complement activation at a model biomaterial surface by capturing autologous complement regulatory molecules from plasma. (C) 2009 Elsevier Ltd. All rights reserved.

Place, publisher, year, edition, pages
Elsevier, 2009
Keywords
Blood compatibility, Complement, C4b-binding protein (C4BP), In vitro test, Regulator of complement activation (RCA), Streptococcal M proteins
National Category
Immunology
Research subject
Biomedical Sciences, Immunology
Identifiers
urn:nbn:se:lnu:diva-73088 (URN)10.1016/j.biomaterials.2009.01.001 (DOI)000264691200026 ()19171378 (PubMedID)
Available from: 2018-04-19 Created: 2018-04-19 Last updated: 2018-04-19Bibliographically approved
Bexborn, F., Andersson, P. O., Chen, H., Nilsson, B. & Nilsson Ekdahl, K. (2008). The Tick-Over Theory Revisited: Formation and Regulation of the Soluble Alternative Complement C3 Convertase (C3(H2O)Bb). Molecular Immunology, 45(8), 2370-2379
Open this publication in new window or tab >>The Tick-Over Theory Revisited: Formation and Regulation of the Soluble Alternative Complement C3 Convertase (C3(H2O)Bb)
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2008 (English)In: Molecular Immunology, ISSN 0161-5890, E-ISSN 1872-9142, Vol. 45, no 8, p. 2370-2379Article in journal (Refereed) Published
National Category
Natural Sciences
Research subject
Biomedical Sciences, Immunology
Identifiers
urn:nbn:se:lnu:diva-2083 (URN)
Available from: 2010-04-06 Created: 2010-04-06 Last updated: 2017-04-20Bibliographically approved
Andersson, J., Bexborn, F., Klinth, J., Nilsson, B. & Nilsson Ekdahl, K. (2006). Functionalized Pluronic˙ as a linker for immobilization of bioactive molecules on a material surface - a new strategy towards improved biomaterial-blood compatibility. Journal of biomedical materials research, 76A(1), 25-34
Open this publication in new window or tab >>Functionalized Pluronic˙ as a linker for immobilization of bioactive molecules on a material surface - a new strategy towards improved biomaterial-blood compatibility
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2006 (English)In: Journal of biomedical materials research, Vol. 76A, no 1, p. 25-34Article in journal (Refereed) Published
National Category
Natural Sciences
Research subject
Biomedical Sciences, Immunology
Identifiers
urn:nbn:se:lnu:diva-671 (URN)
Available from: 2010-04-01 Created: 2010-04-01 Last updated: 2019-02-27Bibliographically approved
Bexborn, F., Andersson, P. O. & Nilsson Ekdahl, K. (2006). Studies of soluble alternate complement complex formation using fluorescence spectroscopy techniques. In: Molecular immunology 43 (1-2): .
Open this publication in new window or tab >>Studies of soluble alternate complement complex formation using fluorescence spectroscopy techniques
2006 (English)In: Molecular immunology 43 (1-2), 2006Conference paper, Published paper (Refereed)
Research subject
Biomedical Sciences, Immunology
Identifiers
urn:nbn:se:lnu:diva-4499 (URN)
Note

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Available from: 2010-04-27 Created: 2010-04-27 Last updated: 2017-04-20Bibliographically approved
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