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IgG4 immunostaining needs to be specifically requested and performed in order to detect IgG4-positive plasma cells. Fibrosis , arranged at least focally [ 3 ] in a "storiform" pattern . "Storiform" is commonly referred to as meaning 'having a cartwheel pattern', but its literal meaning is the appearance of 'a woven mat [Latin: storea ] (of rush ...
The water-accessible surface area of an IgG antibody. Immunoglobulin G (IgG) is a type of antibody.Representing approximately 75% of serum antibodies in humans, IgG is the most common type of antibody found in blood circulation. [1]
Although a clear understanding of the various skin lesions in IgG4-related disease is a work in progress, skin lesions have been classified into subtypes based on documented cases: [2] Angiolymphoid hyperplasia with eosinophilia (or lesions that mimic it) [3] and cutaneous pseudolymphoma; Cutaneous plasmacytosis [Note 1]
Immunizing mice against a rhesus immunoglobulin gives rise to anti-rhesus IgG4. [30] Anti-Rhesus IgG4 [7A8] This is a recombinant monoclonal antibody to rhesus IgG4. It specifically reacts with rhesus IgG4 via ELISA. Specificity of anti-rhesus IgG4 to rhesus IgG1 was confirmed through antibody responses to HIV-1 vaccine in rhesus macaques. [31]
IgG4 is the least abundant IgG subclass in the serum and is often generated following repeated exposure to the same antigen or during persistent infections. IgA antibodies are secreted in the respiratory or the intestinal tract and act as the main mediators of mucosal immunity. [13]
IgG4-related autoimmune diseases are characterized by excessive fibrosis. In case of Riedel's thyroiditis, fibrosis extends beyond the capsule and involves contiguous neck structures, clinically simulating thyroid carcinoma. There is a rapid thyroid enlargement. Compression of trachea, dysphagia are probable outcomes.
Mechanism of class-switch recombination that allows isotype switching in activated B cells. Immunoglobulin class switching, also known as isotype switching, isotypic commutation or class-switch recombination (CSR), is a biological mechanism that changes a B cell's production of immunoglobulin from one type to another, such as from the isotype IgM to the isotype IgG. [1]
IgG deficiency is a form of dysgammaglobulinemia where the proportional levels of the IgG isotype are reduced relative to other immunoglobulin isotypes.. IgG deficiency is often found in children as transient hypogammaglobulinemia of infancy, which may occur with or without additional decreases in IgA or IgM.