Blar i forfatter "Gerogianni, Alexandra"

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    • 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; Tidsskriftartikkel; Peer reviewed, 2022-12-14)
      We found that compstatin, which inhibits the cleavage of complement component C3 to its components C3a and C3b, reduced the E. coli-induced platelet aggregation by 42%-76% (p = 0.0417). This C3-dependent aggregation was not C3a-mediated as neither inhibition of C3a using a blocking antibody or a C3a receptor antagonist, nor the addition of purified C3a had any effects. In contrast, a C3b-blocking ...

    • Heme Interferes With Complement Factor I-Dependent Regulation by Enhancing Alternative Pathway Activation 

      Gerogianni, Alexandra; Dimitrov, Jordan D.; Zarantonello, Alessandra; Poillerat, Victoria; Chonat, Satheesh; Sandholm, Kerstin; McAdam, Karin E.; Ekdahl, Kristina N.; Mollnes, Tom Eirik; Mohlin, Camilla; Roumenina, Lubka T.; Nilsson, Per (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-07-22)
      Hemolysis, as a result of disease or exposure to biomaterials, is characterized by excess amounts of cell-free heme intravascularly and consumption of the protective heme-scavenger proteins in plasma. The liberation of heme has been linked to the activation of inflammatory systems, including the complement system, through alternative pathway activation. Here, we investigated the impact of heme on ...