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IgG3-antigen complexes are deposited on follicular dendritic cells in the presence of C1q and C3
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IgG3-antigen complexes are deposited on follicular dendritic cells in the presence of C1q and C3
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Journal Article
IgG3-antigen complexes are deposited on follicular dendritic cells in the presence of C1q and C3
2017
Overview
IgG3, passively administered together with small proteins, induces enhanced primary humoral responses against these proteins. We previously found that, within 2 h of immunization, marginal zone (MZ) B cells capture IgG3-antigen complexes and transport them into splenic follicles and that this requires the presence of complement receptors 1 and 2. We have here investigated the localization of IgG3 anti-2, 4, 6-trinitrophenyl (TNP)/biotin-ovalbumin-TNP immune complexes in the follicles and the involvement of classical versus total complement activation in this process. The majority (50–90%) of antigen inside the follicles of mice immunized with IgG3-antigen complexes co-localized with the follicular dendritic cell (FDC) network. Capture of antigen by MZ B cells as well as antigen deposition on FDC was severely impaired in mice lacking C1q or C3, and lack of either C1q or C3 also impaired the ability of IgG3 to enhance antibody responses. Finally, IgG3 efficiently primed for a memory response against small proteins as well as against the large protein keyhole limpet hemocyanine.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
Subject
/ 13/31
/ 14
/ 14/19
/ Animals
/ Antibodies, Monoclonal - genetics
/ Antibodies, Monoclonal - metabolism
/ Antigens
/ Biotin
/ Dendritic Cells, Follicular - cytology
/ Dendritic Cells, Follicular - immunology
/ Humanities and Social Sciences
/ Immunoglobulin G - metabolism
/ Mice
/ Proteins
/ Receptors, Complement - genetics
/ Receptors, Complement - immunology
/ Receptors, Complement 3d - genetics
/ Receptors, Complement 3d - immunology
/ Rodents
/ Science
/ Spleen
