Results 1 to 10 of about 15,048 (180)

Purified complement C3b triggers phagocytosis and activation of human neutrophils via complement receptor 1 [PDF]

Scientific Reports, 2023
The complement system provides vital immune protection against infectious agents by labeling them with complement fragments that enhance phagocytosis by immune cells.
Elena Boero, Ronald D. Gorham, Emmet A. Francis, Jonathan Brand, Lay Heng Teng, Dennis J. Doorduijn, Maartje Ruyken, Remy M. Muts, Christian Lehmann, Admar Verschoor, Kok P. M. van Kessel, Volkmar Heinrich, Suzan H. M. Rooijakkers   +12 more
doaj   +2 more sources

Complement C3b contributes to Escherichia coli-induced platelet aggregation in human whole blood [PDF]

Frontiers in Immunology, 2022
IntroductionPlatelets have essential functions as first responders in the immune response to pathogens. Activation and aggregation of platelets in bacterial infections can lead to life-threatening conditions such as arterial thromboembolism or sepsis ...
Anne Landsem, Åse Emblem, Corinna Lau, Dorte Christiansen, Alexandra Gerogianni, Alexandra Gerogianni, Bård Ove Karlsen, Tom Eirik Mollnes, Tom Eirik Mollnes, Tom Eirik Mollnes, Per H. Nilsson, Per H. Nilsson, Per H. Nilsson, Ole-Lars Brekke, Ole-Lars Brekke   +14 more
doaj   +2 more sources

Complement Activation by Post‐Translationally Modified Proteins: Links to Chronic Inflammation and Autoimmunity [PDF]

Immunological Reviews, Volume 342, Issue 1, September 2026.
ABSTRACT Post‐translational modifications (PTMs) of proteins are essential to maintain homeostasis as many cellular processes rely on reversible PTMs. However, several PTMs, particularly irreversible PTMs in the extracellular space, can contribute to tissue dysfunction, inflammation, and may even trigger the development of autoimmunity against PTM ...
Marleen M. J. van Greevenbroek, Leendert A. Trouw   +1 more
wiley   +2 more sources

A First‐in‐Japanese Phase 1, Double‐Blind, Placebo‐Controlled, Parallel‐Cohort Study of Sefaxersen, an Antisense Oligonucleotide Targeting Complement Factor B, in Healthy Participants [PDF]

Clinical Pharmacology in Drug Development, Volume 15, Issue 9, September 2026.
Abstract Increased activity in the complement alternative pathway (AP) plays a key role in diseases such as IgA nephropathy (IgAN). This first‐in‐Japanese double‐blind Phase 1 study investigated the pharmacokinetics (PK), pharmacodynamics (PD), safety, and tolerability of sefaxersen (RO7434656), an antisense oligonucleotide targeting complement factor ...
Takakazu Sato, Hiroyuki Fukase, Takaaki Ishida, Arisa Karasawa   +3 more
wiley   +2 more sources

Crystallization of human complement component C3b in the presence of a staphylococcal complement-inhibitor protein (SCIN) [PDF]

Acta Crystallographica Section F: Structural Biology Communications, 2009
Staphylococcus aureus secretes a number of small proteins that effectively attenuate the human innate immune response. Among these, the staphylococcal complement-inhibitor protein (SCIN) disrupts the function of the complement component 3 (C3) convertase that is initiated through either the classical or the alternative pathway and thereby prevents ...
Daniel Ricklin, Brandon Garcia, John Lambris   +2 more
exaly   +3 more sources

Insights Into Enhanced Complement Activation by Structures of Properdin and Its Complex With the C-Terminal Domain of C3b

Frontiers in Immunology, 2019
Properdin enhances complement-mediated opsonization of targeted cells and particles for immune clearance. Properdin occurs as dimers, trimers and tetramers in human plasma, which recognize C3b-deposited surfaces, promote formation, and prolong the ...
Nicholas M Pearce, Piet Gros
exaly   +3 more sources

A novel and rapid method to purify the human complement opsonin C3b from human plasma

Frontiers in Immunology
Complement opsonin C3b is at the center of the complement cascade. All complement initiation pathways converge when convertases activate C3, converting it into the anaphylatoxin C3a and the opsonin C3b, which can attach to surfaces via its freshly ...
Christoph Q Schmidt
exaly   +3 more sources

Ionic tethering contributes to the conformational stability and function of complement C3b

Molecular Immunology, 2017
C3b, the central component of the alternative pathway (AP) of the complement system, coexists as a mixture of conformations in solution. These conformational changes can affect interactions with other proteins and complement regulators. Here we combine a computational model for electrostatic interactions within C3b with molecular imaging to study the ...
Oscar Llorca, Santiago Rodríguez de Cordoba, Andres López-Perrote   +2 more
exaly   +4 more sources

Structure-Guided Engineering of a Complement Component C3-Binding Nanobody Improves Specificity and Adds Cofactor Activity

Frontiers in Immunology, 2022
The complement system is a part of the innate immune system, where it labels intruding pathogens as well as dying host cells for clearance. If complement regulation is compromised, the system may contribute to pathogenesis.
Henrik Pedersen, Rasmus Kjeldsen Jensen, Annette Gudmann Hansen, Steen Vang Petersen, Steffen Thiel, Nick Stub Laursen, Nick Stub Laursen, Gregers Rom Andersen   +7 more
doaj   +1 more source

Mapping the Complement Factor H-Related Protein 1 (CFHR1):C3b/C3d Interactions. [PDF]

PLoS ONE, 2016
Complement factor H-related protein 1 (CFHR1) is a complement regulator which has been reported to regulate complement by blocking C5 convertase activity and interfering with C5b surface association. CFHR1 also competes with complement factor H (CFH) for
Jonathan P Hannan, Jennifer Laskowski, Joshua M Thurman, Gregory S Hageman, V Michael Holers   +4 more
doaj   +1 more source