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Regulation of the innate immune system by fragmented heparin-conjugated lipids on lipid bilayered membranes in vitro
Uppsala University, Sweden.
Uppsala University, Sweden.
Uppsala University, Sweden.
ABNOBA GmbH, Germany;Assoc Promot Canc Therapy, Germany.
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2023 (English)In: Journal of materials chemistry. B, ISSN 2050-750X, E-ISSN 2050-7518, Vol. 11, no 46, p. 11121-11134Article in journal (Refereed) Published
Abstract [en]

Surface modification with heparin is a powerful biomaterial coating strategy that protects against innate immunity activation since heparin is a part of the proteoglycan heparan sulfate on cell surfaces in the body. We studied the heparinization of cellular and material surfaces via lipid conjugation to a heparin-binding peptide. In the present study, we synthesized fragmented heparin (fHep)-conjugated phospholipids and studied their regulation of the innate immune system on a lipid bilayered surface using liposomes. Liposomes have versatile applications, such as drug-delivery systems, due to their ability to carry a wide range of molecules. Owing to their morphological similarity to cell membranes, they can also be used to mimic a simple cell-membrane to study protein-lipid interactions. We investigated the interaction of complement-regulators, factor H and C4b-binding protein (C4BP), as well as the coagulation inhibitor antithrombin (AT), with fHep-lipids on the liposomal surface. Herein, we studied the ability of fHep-lipids to recruit factor H, C4BP, and AT using a quartz crystal microbalance with dissipation monitoring. With dynamic light scattering, we demonstrated that liposomes could be modified with fHep-lipids and were stable up to 60 days at 4 degree celsius. Using a capillary western blot-based method (Wes), we showed that fHep-liposomes could recruit factor H in a model system using purified proteins and assist in the degradation of the active complement protein C3b to iC3b. Furthermore, we found that fHep-liposomes could recruit factor H and AT from human plasma. Therefore, the use of fHep-lipids could be a potential coating for liposomes and cell surfaces to regulate the immune system on the lipid surface.

Place, publisher, year, edition, pages
Royal Society of Chemistry, 2023. Vol. 11, no 46, p. 11121-11134
National Category
Biochemistry Molecular Biology
Research subject
Chemistry, Biochemistry
Identifiers
URN: urn:nbn:se:lnu:diva-125917DOI: 10.1039/d3tb01721dISI: 001103685900001PubMedID: 37953734Scopus ID: 2-s2.0-85176929830OAI: oai:DiVA.org:lnu-125917DiVA, id: diva2:1817829
Available from: 2023-12-07 Created: 2023-12-07 Last updated: 2025-02-20Bibliographically approved

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Nilsson Ekdahl, Kristina

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