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- W2018372218 abstract "In pigs, protection against the toxigenic extra-cellular bacterium Actinobacillus pleuropneumoniae was correlated with an increased IgG(1):IgG(2) ratio of haemolytic toxin-specific antibodies. In all species so far studied, IgG isotype expression is controlled by Type 1 (IFN-gamma, IL-12) and Type 2 (IL-4, IL-10) cytokines which dictate immune response polarization to cell-mediated (CMI) or antibody-mediated immunity (AMI), respectively. Thus, immunoglobulin (Ig) isotypes reflect Type 1 or Type 2 immune responses. Immunoglobulin isotype production by porcine B-cells cultured in the presence of recombinant porcine (rp) cytokines varies by individual, however pigs tend to generate a high IgG(1):IgG(2) ratio in response to rp IL-10 and the inverse in response to rp IFN-gamma or rp IL-12. Differential Ig isotype production should favor an isotype with a functional advantage to control the inciting infection and disease. However, functions of porcine Ig isotypes have not been described. To compare function of porcine IgM, IgG(1) and IgG(2) of defined specificity for hen eggwhite lysozyme (HEWL), Ig isotypes were affinity purified from serum by HEWL specificity and by isotype-specific mouse monoclonal antibodies. Their ability to activate complement (C') and to opsonize was tested in vitro. Porcine IgG(2) had greater guinea pig C' activating ability than did IgG(1). Neither isotype opsonized HEWL-conjugated sheep erythrocytes in vitro. Amino acid sequence analysis of IgG isotypes revealed that all subclasses have putative C' binding sites but that IgG(2a), IgG(2b) and IgG(4) were more flexible in the middle hinge region than IgG(1) and IgG(3) and would likely activate C' more efficiently. Thus, porcine IgG isotypes associated with resistance and susceptibility to disease also differ in their actual and predicted biological functions." @default.
- W2018372218 created "2016-06-24" @default.
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- W2018372218 date "2003-06-01" @default.
- W2018372218 modified "2023-10-16" @default.
- W2018372218 title "Porcine Ig isotypes: function and molecular characteristics" @default.
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- W2018372218 doi "https://doi.org/10.1016/s0264-410x(03)00142-7" @default.
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