Competition between Serum IgG, IgM, and IgA Anti-Glycan Antibodies
Por um escritor misterioso
Last updated 21 setembro 2024
Anti-glycan antibodies are an abundant subpopulation of serum antibodies with critical functions in many immune processes. Changes in the levels of these antibodies can occur with the onset of disease, exposure to pathogens, or vaccination. As a result, there has been significant interest in exploiting anti-glycan antibodies as biomarkers for many diseases. Serum contains a mixture of anti-glycan antibodies that can recognize the same antigen, and competition for binding can potentially influence the detection of antibody subpopulations that are more relevant to disease processes. The most abundant antibody isotypes in serum are IgG, IgM, and IgA, but little is known regarding how these different isotypes compete for the same glycan antigen. In this study, we developed a multiplexed glycan microarray assay and applied it to evaluate how different isotypes of anti-glycan antibodies (IgA, IgG, and IgM) compete for printed glycan antigens. While IgG and IgA antibodies typically outcompete IgM for peptide or protein antigens, we found that IgM outcompete IgG and IgA for many glycan antigens. To illustrate the importance of this effect, we provide evidence that IgM competition can account for the unexpected observation that IgG of certain antigen specificities appear to be preferentially transported from mothers to fetuses. We demonstrate that IgM in maternal sera compete with IgG resulting in lower than expected IgG signals. Since cord blood contains very low levels of IgM, competition only affects maternal IgG signals, making it appear as though certain IgG antibodies are higher in cord blood than matched maternal blood. Taken together, the results highlight the importance of competition for studies involving anti-glycan antibodies.
Serum components influence antibody reactivity to glycan and DNA antigens
Maternal IgG and IgA Antibodies Dampen Mucosal T Helper Cell Responses in Early Life - ScienceDirect
Serum antibodies blocked by glycan antigens in canine visceral leishmaniasis serology are mostly IgA immune complexes, Parasitology
An Fc variant with two mutations confers prolonged serum half-life and enhanced effector functions on IgG antibodies
Frontiers IgM Antibodies Can Access Cryptic Antigens Denied to IgG: Hypothesis on Novel Binding Mechanism
Serum antibodies blocked by glycan antigens in canine visceral leishmaniasis serology are mostly IgA immune complexes, Parasitology
Antibodies, Free Full-Text
Serum antibodies blocked by glycan antigens in canine visceral leishmaniasis serology are mostly IgA immune complexes, Parasitology
Competition between Serum IgG, IgM, and IgA Anti-Glycan Antibodies
Glycans in the immune system and The Altered Glycan Theory of Autoimmunity: A critical review - ScienceDirect
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