PMID- 26497515 OWN - NLM STAT- MEDLINE DCOM- 20160819 LR - 20240329 IS - 1600-065X (Electronic) IS - 0105-2896 (Print) IS - 0105-2896 (Linking) VI - 268 IP - 1 DP - 2015 Nov TI - Fcgamma receptor pathways during active and passive immunization. PG - 88-103 LID - 10.1111/imr.12343 [doi] AB - IgG antibodies are actively produced in response to antigenic challenge or passively administered as an effective form of immunotherapy to confer immunity against foreign antigens. Their protective activity is mediated through their bifunctional nature: a variable Fab domain mediates antigen-binding specificity, whereas the constant Fc domain engages Fcgamma receptors (FcgammaRs) expressed on the surface of leukocytes to mediate effector functions. While traditionally considered the invariant domain of an IgG molecule, the Fc domain displays remarkable structural heterogeneity determined primarily by differences in the amino acid sequence of the various IgG subclasses and by the composition of the complex, Fc-associated biantennary N-linked glycan. These structural determinants regulate the conformational flexibility of the IgG Fc domain and affect its capacity to interact with distinct types of FcgammaRs (type I or type II FcgammaRs). FcgammaR engagement activates diverse downstream immunomodulatory pathways with pleiotropic functional consequences including cytotoxicity and phagocytosis of IgG-coated targets, differentiation and activation of antigen presenting cells, modulation of T-cell activation, plasma cell survival, and regulation of antibody responses. These functions highlight the importance of FcgammaR-mediated pathways in the modulation of adaptive immune responses and suggest a central role for IgG-FcgammaR interactions during active and passive immunization. CI - (c) 2015 John Wiley & Sons A/S. Published by John Wiley & Sons Ltd. FAU - Bournazos, Stylianos AU - Bournazos S AD - The Laboratory of Molecular Genetics and Immunology, The Rockefeller University, New York, NY, USA. FAU - Ravetch, Jeffrey V AU - Ravetch JV AD - The Laboratory of Molecular Genetics and Immunology, The Rockefeller University, New York, NY, USA. LA - eng GR - P01 AI100148/AI/NIAID NIH HHS/United States GR - R01 CA080757/CA/NCI NIH HHS/United States GR - R56 AI034662/AI/NIAID NIH HHS/United States PT - Journal Article PT - Research Support, N.I.H., Extramural PT - Research Support, Non-U.S. Gov't PT - Review PL - England TA - Immunol Rev JT - Immunological reviews JID - 7702118 RN - 0 (Immunoglobulin G) RN - 0 (Receptors, IgG) SB - IM MH - Animals MH - Dendritic Cells/immunology/metabolism MH - Humans MH - *Immunization, Passive MH - Immunoglobulin G/chemistry/classification/*immunology/*metabolism MH - Immunomodulation MH - Immunotherapy MH - Multigene Family MH - Protein Binding MH - Protein Interaction Domains and Motifs MH - Receptors, IgG/chemistry/genetics/*metabolism MH - *Signal Transduction MH - *Vaccination PMC - PMC7556827 MID - NIHMS1610670 OTO - NOTNLM OT - Fc receptors OT - antibodies OT - immunotherapies OT - inflammation OT - vaccination COIS- The authors have no conflicting financial interests. EDAT- 2015/10/27 06:00 MHDA- 2016/08/20 06:00 PMCR- 2020/10/14 CRDT- 2015/10/27 06:00 PHST- 2015/10/27 06:00 [entrez] PHST- 2015/10/27 06:00 [pubmed] PHST- 2016/08/20 06:00 [medline] PHST- 2020/10/14 00:00 [pmc-release] AID - 10.1111/imr.12343 [doi] PST - ppublish SO - Immunol Rev. 2015 Nov;268(1):88-103. doi: 10.1111/imr.12343.