Mouse Fc-gamma receptor (FcγR) (FcγR)

Mouse Fc-gamma receptors (FcγRs) are a family of cell surface glycoproteins that bind the Fc region of immunoglobulin G (IgG) antibodies, serving as a critical link between the humoral and cellular immune systems [PMID: 15634879]. In mice, this family includes four distinct receptors: the high-affinity activating receptor FcγRI (CD64), the low-affinity inhibitory receptor FcγRIIB (CD32), and the activating receptors FcγRIII (CD16) and FcγRIV [PMID: 18443457]. These receptors are widely expressed on hematopoietic cells, including macrophages, neutrophils, and natural killer cells, where they mediate effector functions such as phagocytosis, antibody-dependent cellular cytotoxicity (ADCC), and the release of pro-inflammatory cytokines [PMID: 12144493]. The balance between activating and inhibitory FcγR signaling is essential for maintaining immune homeostasis and preventing autoimmunity [PMID: 15634879]. In drug development, mouse FcγRs are vital for evaluating the efficacy of therapeutic monoclonal antibodies, as the interaction between the antibody's Fc domain and these receptors determines the drug's ability to eliminate target cells [PMID: 20068226]. Furthermore, mouse models are frequently used to study the impact of Fc-engineering on antibody half-life and effector function, providing insights that guide human clinical trials [PMID: 17438514]. Understanding these interactions is essential for translating findings from mouse models to human clinical applications, where therapeutic strategies often involve engineering antibody Fc regions to optimize binding to specific FcγRs to enhance the therapeutic index [PMID: 24610278].

Other names

Fc gamma receptorFcgrCD16CD32CD64Fcgr1Fcgr2bFcgr3Fcgr4Low affinity immunoglobulin gamma Fc receptorHigh affinity immunoglobulin gamma Fc receptor

Mouse Fc-gamma receptors (FcγRs) modulate immune responses by binding the Fc portion of IgG antibodies; activating receptors (FcγRI, III, IV) signal via ITAMs to induce phagocytosis and ADCC, while the inhibitory receptor (FcγRIIB) signals via an ITIM to suppress immune activation [PMID: 15634879].