Results 11 to 20 of about 792,617 (213)

The Sez6 Family Inhibits Complement by Facilitating Factor I Cleavage of C3b and Accelerating the Decay of C3 Convertases

Frontiers in Immunology, 2021
The Sez6 family consists of Sez6, Sez6L, and Sez6L2. Its members are expressed throughout the brain and have been shown to influence synapse numbers and dendritic morphology. They are also linked to various neurological and psychiatric disorders.
Wen Q. Qiu, Shaopeiwen Luo, Stefanie A. Ma, Priyanka Saminathan, Herman Li, Jenny M. Gunnersen, Harris A. Gelbard, Jennetta W. Hammond   +7 more
doaj   +2 more sources

The Sand Fly Salivary Protein Lufaxin Inhibits the Early Steps of the Alternative Pathway of Complement by Direct Binding to the Proconvertase C3b-B

Frontiers in Immunology, 2017
Saliva of the blood feeding sand fly Lutzomyia longipalpis was previously shown to inhibit the alternative pathway (AP) of the complement system. Here, we have identified Lufaxin, a protein component in saliva, as the inhibitor of the AP.
Antonio F. Mendes-Sousa, Antonio F. Mendes-Sousa, Vladimir Fazito do Vale, Vladimir Fazito do Vale, Naylene C. S. Silva, Anderson B. Guimaraes-Costa, Marcos H. Pereira, Marcos H. Pereira, Mauricio R. V. Sant’Anna, Mauricio R. V. Sant’Anna, Fabiano Oliveira, Shaden Kamhawi, José M. C. Ribeiro, John F. Andersen, Jesus G. Valenzuela, Ricardo N. Araujo, Ricardo N. Araujo   +16 more
doaj   +2 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 ...
Ramon M. van den Bos, Nicholas M. Pearce, Joke Granneman, T. Harma C. Brondijk, Piet Gros   +4 more
doaj   +2 more sources

Properdin binding to complement activating surfaces depends on initial C3b deposition [PDF]

Proceedings of the National Academy of Sciences, 2017
SignificanceThe role of properdin in stabilization of the alternative pathway C3 convertase is indisputable, whereas its role as pattern recognition molecule remains controversial. Properdin lacks the structural homology shared by other pattern recognition molecules of the complement system, and has its major function in stabilizing the C3bBb ...
Morten Harboe, Christina Johnson, Stig Nymo, Karin Ekholt, Camilla Schjalm, Julie K. Lindstad, Anne Pharo, Bernt Christian Hellerud, Kristina Nilsson Ekdahl, Tom Eirik Mollnes, Per H. Nilsson   +10 more
openaire   +6 more sources

Complement C3b Measurement [PDF]

Definitions, 2020
of the ...
openaire   +2 more sources

Factor H binding proteins protect division septa on encapsulated Streptococcus pneumoniae against complement C3b deposition and amplification. [PDF]

Nat Commun, 2018
Streptococcus pneumoniae evades C3-mediated opsonization and effector functions by expressing an immuno-protective polysaccharide capsule and Factor H (FH)-binding proteins. Here we use super-resolution microscopy, mutants and functional analysis to show
Pathak A, Bergstrand J, Sender V, Spelmink L, Aschtgen MS, Muschiol S, Widengren J, Henriques-Normark B.   +7 more
europepmc   +2 more sources

Complement Activation Profile in Myasthenia Gravis Patients: Perspectives for Tailoring Anti-Complement Therapy

Biomedicines, 2022
The complement system plays a key role in myasthenia gravis (MG). Anti-complement drugs are emerging as effective therapies to treat anti-acetylcholine receptor (AChR) antibody-positive MG patients, though their usage is still limited by the high costs ...
Nicola Iacomino, Fiammetta Vanoli, Rita Frangiamore, Marta Ballardini, Letizia Scandiffio, Federica Bortone, Francesca Andreetta, Fulvio Baggi, Pia Bernasconi, Carlo Antozzi, Paola Cavalcante, Renato Mantegazza   +11 more
doaj   +1 more source

Staphylococcal protein Ecb impairs complement receptor-1 mediated recognition of opsonized bacteria. [PDF]

PLoS ONE, 2017
Staphyloccus aureus is a major human pathogen leading frequently to sepsis and soft tissue infections with abscesses. Multiple virulence factors including several immune modulating molecules contribute to its survival in the host. When S.
Hanne Amdahl, Karita Haapasalo, Lydia Tan, Taru Meri, Pentti I Kuusela, Jos A van Strijp, Suzan Rooijakkers, T Sakari Jokiranta   +7 more
doaj   +1 more source

Quantitative detection of red blood cell antibody-mediated complement activation

Zhongguo shuxue zazhi, 2022
Objective To construct an in-vitro model of erythrocyte antibody-mediated complement activation, and establish quantitative detection methods based on flow cytometry and spectrophotometry, so as to explore the correlation of anti-body titers and ...
Zhongying WANG, Jian LI, Fengyong ZHAO, Chenrui QIAN, Wei SHEN, Liangfeng FAN, Sha JIN, Jiewei ZHENG, Yuyu ZHANG, Dong XIANG   +9 more
doaj   +1 more source

Purification of the human complement control protein C3b inactivator [PDF]

Biochemical Journal, 1980
An alternative method of isolation from human plasma is described for C3b inactivator, C3bINA, the proteinase that in conjunction with either beta 1H or C4b-binding protein will hydrolyse respectively C3b or C4b, the activation products of the third, C3 and fourth, C4, components of complement. The purification is by chromatography of plasma on columns
L G, Crossley, R R, Porter
openaire   +2 more sources