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Antibodies Against C1q

2019
Antibodies to components of the innate immune system are frequently detected in the sera of patients with systemic lupus erythematosus (SLE). Among these are antibodies against various components of the complement system. Antibodies to C1q have drawn particular attention as they have been suggested to be involved in the pathogenesis of lupus nephritis ...
De Leeuw, Karina, Kallenberg, Cees G.M.
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C1q: A novel angiogenic factor?

Molecular Immunology, 2008
We have recently shown that endothelial cells (ECs) isolated from human decidua synthesize C1q and express surface-bound C1q under physiological conditions [Bulla et al., 2008. Mol. Immunol.]. Since decidua is a typical site of vascular remodelling and active angiogenic process, we sought to ascertain whether C1q may play a role in promoting ...
BOSSI, FLEUR   +7 more
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C1q solid-phase radioimmunoassay: Binding properties of solid-phase C1q and evidence that C1q-binding IgG complexes in systemic lupus erythematosus are not bound to endogenous C1q

Journal of Immunological Methods, 1984
The binding properties of C1q solid-phase radioimmunoassay (C1q SPRIA) were examined, using heat-aggregated IgG (HAG) as the model of immune complexes (IC). The free, liquid-phase C1q, which was added to the C1q-coated tubes prior to the addition of HAG, had little inhibitory effect on binding of HAG to the solid-phase C1q, suggesting that the solid ...
Shu Uwatoko   +6 more
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C1q

2018
The first component of a complement is a pentameric complex comprising of C1q and the Ca2+-dependent tetramer C1r2C1s2. The roles of C1q within this complex are to recognise and bind immune complexes, as well as pathogen- or danger-associated molecular ligands, and trigger activation of the classical pathway of complement.
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Isolation and characterization of mouse C1q

Journal of Immunological Methods, 1980
C1q was isolated from mouse serum and ascites fluid by absorption onto human IgG-coated latex beads followed by separation on 3-10% exponential gradient sodium dodecyl sulfate (SDS) polyacrylamide gels. Mouse C1q was also purified by low ionic strength precipitation of mouse serum.
Paul K. Nakane, Linda M. McManus
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A method to differentiate between anti-C1q antibodies and C1q-binding immune complexes using collagenase-digested solid phase C1q

Journal of Immunological Methods, 1991
A method for the detection of circulating immune complexes in the presence of autoantibodies to C1q is described. Solid phase C1q-digestion with bacterial collagenase results in the elimination of the collagen-like region of C1q. Binding of model immune complexes to this modified solid phase C1q is practically unaltered, while reactivity of anti-C1q ...
Fritz Gamerith   +4 more
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C1q Receptors

2018
C1q, the recognition component of the classical complement pathway, also regulates numerous cellular processes independent of its role in complement activation. Among these processes is myeloid cell activation leading to enhanced engulfment of apoptotic cells and the regulation of proinflammatory cytokine production which is thought to be important in ...
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C1q levels in hereditary angioedema

Journal of Allergy and Clinical Immunology, 1977
In 21 affected members from 4 kindreds with hereditary angioedema, serum C1q levels generally were in the lower part of the normal range, with some values clearly below the lower limit of normal. The serum C1q levels in patients with hereditary angioedema were significantly depressed when compared with those in unaffected family members (p less than 0 ...
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THE ULTRASTRUCTURE OF HUMAN C1q [PDF]

open access: possibleActa Pathologica Microbiologica Scandinavica Section B Microbiology and Immunology, 1970
Björn Bloth, Sven-Eric Svehag
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Classical Complement Pathway Component C1q: Purification of Human C1q, Isolation of C1q Collagen-Like and Globular Head Fragments and Production of Recombinant C1q—Derivatives. Functional Characterization

2013
The classical complement pathway (CCP) activation is a multimolecular complex, composed of three subcomponents namely C1q, C1r, and C1s. C1q is the recognition subunit of this complex and its binding to the specific targets leads to the formation of active C1, which in turn activates the CCP in an immunoglobulin-dependent or -independent manner. C1q is
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