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الاجابـــة

IGE

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http://en.wikipedia.org/wiki/Immunoglobulin_E


تقبل تحياتي

• IgM is found either as a cell-surface-bound monomer or as a secreted pentamer with 10 H and L chains linked by disulfide bonds and a J (“joining”) chain . In general, IgM is the first immunoglobulin to be formed following antigenic stimulation. IgM is effective both at immobilizing antigen (agglutination) and in activating the classical pathway of complement.
• IgD has a monomeric structure and is almost exclusively displayed on B cell surfaces. Influences lymphocyte function.
• IgG exists as both surface and secreted monomeric . Four subclasses human IgG , IgG1, IgG2, IgG3, and IgG4.
Collectively, IgG subclasses make up the greatest amount of immunoglobulin in the serum. Many IgG antibodies are effective in activating complement , opsonizing and neutralizing microorganisms and viruses, and initiating antibody-dependent cell-mediated cytotoxicity, and they function in a wide variety of hypersensitivity functions.
• IgA is present in both monomeric and dimeric forms. Monomeric IgA is found in the serum. The addition of a J or joining chain to two IgA monomers forms a dimer. Epithelial cells use a specialized receptor to transport the IgA dimer to mucosal surfaces. Secretory IgA dimers are found in mucus, saliva, tears, breast milk, and gastrointestinal secretions. Large amounts of IgA are synthesized and secreted daily at the mucosal surfaces of the GI tract, respiratory tracts, and other secretory epithelia.
• IgE is present in relatively low serum concentration; most is adsorbed onto the surfaces of mast cells, monocytes, and eosinophils. Cross-linking of IgE on mast cell surfaces by antigen triggers the release of histamine and other inflammatory mediators, leading to immediate hypersensitivity (allergic) responses.




• IgM is found either as a cell-surface-bound monomer or as a secreted pentamer with 10 H and L chains linked by disulfide bonds and a J (“joining”) chain . In general, IgM is the first immunoglobulin to be formed following antigenic stimulation. IgM is effective both at immobilizing antigen (agglutination) and in activating the classical pathway of complement.
• IgD has a monomeric structure and is almost exclusively displayed on B cell surfaces. Influences lymphocyte function.
• IgG exists as both surface and secreted monomeric . Four subclasses human IgG , IgG1, IgG2, IgG3, and IgG4.
Collectively, IgG subclasses make up the greatest amount of immunoglobulin in the serum. Many IgG antibodies are effective in activating complement , opsonizing and neutralizing microorganisms and viruses, and initiating antibody-dependent cell-mediated cytotoxicity, and they function in a wide variety of hypersensitivity functions.
• IgA is present in both monomeric and dimeric forms. Monomeric IgA is found in the serum. The addition of a J or joining chain to two IgA monomers forms a dimer. Epithelial cells use a specialized receptor to transport the IgA dimer to mucosal surfaces. Secretory IgA dimers are found in mucus, saliva, tears, breast milk, and gastrointestinal secretions. Large amounts of IgA are synthesized and secreted daily at the mucosal surfaces of the GI tract, respiratory tracts, and other secretory epithelia.
• IgE is present in relatively low serum concentration; most is adsorbed onto the surfaces of mast cells, monocytes, and eosinophils. Cross-linking of IgE on mast cell surfaces by antigen triggers the release of histamine and other inflammatory mediators, leading to immediate hypersensitivity (allergic) responses.


• IgM is found either as a cell-surface-bound monomer or as a secreted pentamer with 10 H and L chains linked by disulfide bonds and a J (“joining”) chain . In general, IgM is the first immunoglobulin to be formed following antigenic stimulation. IgM is effective both at immobilizing antigen (agglutination) and in activating the classical pathway of complement.
• IgD has a monomeric structure and is almost exclusively displayed on B cell surfaces. Influences lymphocyte function.
• IgG exists as both surface and secreted monomeric . Four subclasses human IgG , IgG1, IgG2, IgG3, and IgG4.
Collectively, IgG subclasses make up the greatest amount of immunoglobulin in the serum. Many IgG antibodies are effective in activating complement , opsonizing and neutralizing microorganisms and viruses, and initiating antibody-dependent cell-mediated cytotoxicity, and they function in a wide variety of hypersensitivity functions.
• IgA is present in both monomeric and dimeric forms. Monomeric IgA is found in the serum. The addition of a J or joining chain to two IgA monomers forms a dimer. Epithelial cells use a specialized receptor to transport the IgA dimer to mucosal surfaces. Secretory IgA dimers are found in mucus, saliva, tears, breast milk, and gastrointestinal secretions. Large amounts of IgA are synthesized and secreted daily at the mucosal surfaces of the GI tract, respiratory tracts, and other secretory epithelia.
• IgE is present in relatively low serum concentration; most is adsorbed onto the surfaces of mast cells, monocytes, and eosinophils. Cross-linking of IgE on mast cell surfaces by antigen triggers the release of histamine and other inflammatory mediators, leading to immediate hypersensitivity (allergic) responses.




• IgM is found either as a cell-surface-bound monomer or as a secreted pentamer with 10 H and L chains linked by disulfide bonds and a J (“joining”) chain . In general, IgM is the first immunoglobulin to be formed following antigenic stimulation. IgM is effective both at immobilizing antigen (agglutination) and in activating the classical pathway of complement.
• IgD has a monomeric structure and is almost exclusively displayed on B cell surfaces. Influences lymphocyte function.
• IgG exists as both surface and secreted monomeric . Four subclasses human IgG , IgG1, IgG2, IgG3, and IgG4.
Collectively, IgG subclasses make up the greatest amount of immunoglobulin in the serum. Many IgG antibodies are effective in activating complement , opsonizing and neutralizing microorganisms and viruses, and initiating antibody-dependent cell-mediated cytotoxicity, and they function in a wide variety of hypersensitivity functions.
• IgA is present in both monomeric and dimeric forms. Monomeric IgA is found in the serum. The addition of a J or joining chain to two IgA monomers forms a dimer. Epithelial cells use a specialized receptor to transport the IgA dimer to mucosal surfaces. Secretory IgA dimers are found in mucus, saliva, tears, breast milk, and gastrointestinal secretions. Large amounts of IgA are synthesized and secreted daily at the mucosal surfaces of the GI tract, respiratory tracts, and other secretory epithelia.
• IgE is present in relatively low serum concentration; most is adsorbed onto the surfaces of mast cells, monocytes, and eosinophils. Cross-linking of IgE on mast cell surfaces by antigen triggers the release of histamine and other inflammatory mediators, leading to immediate hypersensitivity (allergic) responses.

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