Browsing NTNU Open by Author "Christiansen, Dorte"
Now showing items 1-16 of 16
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Air Bubbles Activate Complement and Trigger Hemostasis and C3-Dependent Cytokine Release Ex Vivo in Human Whole Blood
Storm, Benjamin; Christiansen, Dorte; Fure, Hilde; Ludviksen, Judith K; Lau, Corinna; Lambris, John D.; Woodruff, Trent M.; Brekke, Ole-Lars; Braaten, Tonje Bjørndal; Nielsen, Erik Waage; Mollnes, Tom Eirik (Journal article; Peer reviewed, 2021)Venous air embolism, which may complicate medical and surgical procedures, activates complement and triggers thromboinflammation. In lepirudin-anticoagulated human whole blood, we examined the effect of air bubbles on ... -
Avoiding ambient air in test tubes during incubations of human whole-blood minimizes complement background activation
Storm, Benjamin; Christiansen, Dorte; Mollnes, Tom Eirik; Nielsen, Erik Waage (Peer reviewed; Journal article, 2020)Background In vitro, the complement system can be studied in test tubes incubated with anticoagulated human whole-blood. Background activation of complement may mask inflammatory signals. Air bubbles are known to activate ... -
Combined inhibition of C5 and CD14 efficiently attenuated the inflammatory response in a porcine model of meningococcal sepsis
Hellerud, Bernt C; Orrem, Hilde L.; Dybwik, Knut Gustav; Pischke, Søren Erik; Barratt-Due, Andreas; Castellheim, Albert; Fure, Hilde; Bergseth, Grete; Christiansen, Dorte; Nunn, Miles A.; Espevik, Terje; Lau, Corinna; Brandtzæg, Petter; Nielsen, Erik Waage; Mollnes, Tom Eirik (Journal article; Peer reviewed, 2017)Background Fulminant meningococcal sepsis, characterized by overwhelming innate immune activation, mostly affects young people and causes high mortality. This study aimed to investigate the effect of targeting two key ... -
Combined inhibition of complement and CD14 attenuates bacteria-induced inflammation in human whole blood more efficiently than antagonizing the toll-like receptor 4-MD2 complex
Gustavsen, Alice; Nymo, Stig Haugset; Landsem, Anne; Christiansen, Dorte; Ryan, Liv; Husebye, Harald; Lau, Corinna; Pischke, Søren Erik; Lambris, John D.; Espevik, Terje; Mollnes, Tom Eirik (Journal article; Peer reviewed, 2016)Background. Single inhibition of the Toll-like receptor 4 (TLR4)–MD2 complex failed in treatment of sepsis. CD14 is a coreceptor for several TLRs, including TLR4 and TLR2. The aim of this study was to investigate the effect ... -
Complement C3b contributes to Escherichia coli-induced platelet aggregation in human whole blood
Landsem, Anne; Emblem, Åse; Lau, Corinna; Christiansen, Dorte; Gerogianni, Alexandra; Karlsen, Bård Ove; Mollnes, Tom Eirik; Nilsson, Per; Brekke, Ole Lars (Journal article; Peer reviewed, 2022) -
A complement C3–Specific nanobody for modulation of the alternative cascade identifies the C-Terminal domain of C3b as functional in C5 convertase activity
Pedersen, Henrik; Jensen, Rasmus K.; Jensen, Jens Magnus B.; Fox, Rachel; Pedersen, Dennis V.; Olesen, Heidi G.; Hansen, Annette G.; Christiansen, Dorte; Mazarakis, Sofia M.M.; Lojek, Neal; Hansen, Pernille; Gadeberg, Trine A.F.; Zarantonello, Alessandra; Laursen, Nick S.; Mollnes, Tom Eirik; Johnson, Matthew B.; Stevens, Beth; Thiel, Steffen; Andersen, Gregers R. (Peer reviewed; Journal article, 2020)The complement system is an intricate cascade of the innate immune system and plays a key role in microbial defense, inflammation, organ development, and tissue regeneration. There is increasing interest in developing ... -
Complement component 5 does not interfere with physiological hemostasis but is essential for Escherichia coli-induced coagulation accompanied by Toll-like receptor 4.
Landsem, Anne; Fure, Hilde; Ludviksen, Judith K; Christiansen, Dorte; Lau, Corinna; Mathisen, Monica Dammen; Bergseth, Grete; Nymo, Stig Haugset; Lappegård, Knut Tore; Woodruff, T. M.; Espevik, Terje; Mollnes, Tom Eirik; Brekke, Ole-Lars (Journal article; Peer reviewed, 2018)There is a close cross‐talk between complement, Toll‐like receptors (TLRs) and coagulation. The role of the central complement component 5 (C5) in physiological and pathophysiological hemostasis has not, however, been fully ... -
Eculizumab treatment during pregnancy does not affect the complement system activity of the newborn
Hallstensen, Randi; Bergseth, Grete; Foss, Stian; Jæger, Steinar; Gedde-Dahl, Thobias; Holt, jan; Christiansen, Dorte; Lau, Corinna; Brekke, Ole Lars; Armstrong, Elina; Stefanovic, Vedran; Andersen, Jan Terje; Sandlie, Inger; Mollnes, Tom Eirik (Journal article; Peer reviewed, 2015)Eculizumab is a humanized IgG2/4 chimeric anti-complement C5 antibody used to treat patients with paroxysmal nocturnal hemoglobinuria (PNH) or atypical hemolytic uremic syndrome. The aim of this study was to evaluate whether ... -
Effect of the anticoagulant, storage time and temperature of blood samples on the concentrations of 27 multiplex assayed cytokines - Consequences for defining reference values in healthy humans
Hennø, Linda Torrissen; Storjord, Elin; Christiansen, Dorte; Bergseth, Grete; Ludviksen, Judith K; Fure, Hilde; Barene, Svein; Nielsen, Erik Waage; Mollnes, Tom Eirik; Brekke, Ole Lars (Journal article; Peer reviewed, 2017)Cytokines are potentially useful biomarkers of sepsis and other inflammatory conditions. Many cytokines can be released by leukocytes and platelets after sampling. The sampling and processing techniques are consequently ... -
Granulocyte and monocyte CD11b expression during plasma separation is dependent on complement factor 5 (C5) – an ex vivo study with blood from a C5‐deficient individual
Hardersen, Randolf Inge; Enebakk, Terje; Christiansen, Dorte; Bergseth, Grete; Brekke, Ole-Lars; Mollnes, Tom Eirik; Lappegård, Knut Tore; Hovland, Anders (Journal article, 2018)The aim of the study was to investigate the role of complement factor 5 (C5) in reactions elicited by plasma separation using blood from a C5‐deficient (C5D) individual, comparing it to C5‐deficient blood reconstituted ... -
Key role of the number of complement receptor 1 on erythrocytes for binding of Escherichia coli to erythrocytes and for leukocyte phagocytosis and oxidative burst in human whole blood
Brekke, Ole-Lars; Christiansen, Dorte; Kisserli, Aymric; Fure, Hilde; Dahl, Jim André; Donvito, Béatrice; Reveil, Brigitte; Ludviksen, Judith K; Tabary, Thierry; Mollnes, Tom Eirik; Cohen, Jacques H.M. (Peer reviewed; Journal article, 2019)Aim To study the role of complement receptor 1 (CR1) for binding of Escherichia coli (E. coli) to erythrocytes, for leukocyte phagocytosis, oxidative burst and complement activation in human whole blood from a CR1 deficient ... -
Open chest and pericardium facilitate transpulmonary passage of venous air emboli
Storm, Benjamin; Halvorsen, Per Steinar; Skulstad, Helge; Dybwik, Knut Gustav; Schjalm, Camilla; Christiansen, Dorte; Wisløff-Aase, Kristin; Fosse, Erik; Braaten, Tonje Bjørndal; Nielsen, Erik Waage; Mollnes, Tom Eirik (Peer reviewed; Journal article, 2021)Background Transpulmonary passage of air emboli can lead to fatal brain- and myocardial infarctions. We studied whether pigs with open chest and pericardium had a greater transpulmonary passage of venous air emboli than ... -
Phagocytosis of live and dead Escherichia coli and Staphylococcus aureus in human whole blood is markedly reduced by combined inhibition of C5aR1 and CD14
Skjeflo, Espen Waage; Christiansen, Dorte; Landsem, Anne; Stenvik, Jørgen; Woodruff, T. M.; Espevik, Terje; Nielsen, Erik Waage; Mollnes, Tom Eirik (Journal article; Peer reviewed, 2019)Background Sepsis is a dysregulated host response to infection. The aim of this study was to investigate the effects of complement- and CD14 inhibition on phagocytosis of live and dead Gram-negative and Gram-positive ... -
Quantification of Porcine Complement Activation Fragment C3a by a Neoepitope-Based Enzyme-Linked Immunosorbent Assay
Nilsson, Per; Pettersen, Kristin; Oppermann, Martin; Skjeflo, Espen Waage; Fure, Hilde; Christiansen, Dorte; Mollnes, Tom Eirik (Peer reviewed; Journal article, 2021)Enzyme-linked immunosorbent assay (ELISA) enables fast and simple quantification of analytes in the pico- to nanogram range in complex samples. Here, we describe an ELISA for the detection of porcine C3a as a marker for ... -
Staphylococcus aureus-induced complement activation promotes tissue factor-mediated coagulation
Skjeflo, Espen Waage; Christiansen, Dorte; Fure, Hilde; Ludviksen, Judith K; Woodruff, Trent M.; Espevik, Terje; Nielsen, Erik Waage; Brekke, Ole-Lars; Mollnes, Tom Eirik (Journal article; Peer reviewed, 2018)Background There is extensive cross‐talk between the complement system, the Toll‐like receptors (TLRs), and hemostasis. Consumptive coagulopathy is a hallmark of sepsis, and is often mediated through increased tissue ... -
Venous Air Embolism Activates Complement C3 Without Corresponding C5 Activation and Trigger Thromboinflammation in Pigs
Storm, Benjamin; Ludviksen, Judith K; Christiansen, Dorte; Fure, Hilde; Pettersen, Kristin; Landsem, Anne; Nilsen, Bent Aksel; Dybwik, Knut Gustav; Braaten, Tonje; Nielsen, Erik Waage; Mollnes, Tom Eirik (Peer reviewed; Journal article, 2022)Introduction: Air embolism may complicate invasive medical procedures. Bubbles trigger complement C3-mediated cytokine release, coagulation, and platelet activation in vitro in human whole blood. Since these findings have ...