Wed . 18 Sep 2018

Fc receptor

fc receptor, fc receptor blocking
An Fc receptor is a protein found on the surface of certain cells – including, among others, B lymphocytes, follicular dendritic cells, natural killer cells, macrophages, neutrophils, eosinophils, basophils, human platelets, and mast cells – that contribute to the protective functions of the immune system Its name is derived from its binding specificity for a part of an antibody known as the Fc Fragment, crystallizable region Fc receptors bind to antibodies that are attached to infected cells or invading pathogens Their activity stimulates phagocytic or cytotoxic cells to destroy microbes, or infected cells by antibody-mediated phagocytosis or antibody-dependent cell-mediated cytotoxicity Some viruses such as flaviviruses use Fc receptors to help them infect cells, by a mechanism known as antibody-dependent enhancement of infection

Contents

  • 1 Classes
    • 11 Fc-gamma receptors
    • 12 Fc-alpha receptors
    • 13 Fc-epsilon receptors
    • 14 Summary table
  • 2 Functions
  • 3 Signaling mechanisms - Fc gamma receptors
    • 31 Activation
    • 32 Inhibition
  • 4 Cellular activation
    • 41 On phagocytes
    • 42 On NK cells
    • 43 On mast cells
    • 44 On eosinophils
  • 5 See also
  • 6 References
  • 7 Further reading
  • 8 External links

Classes

There are several different types of Fc receptors abbreviated FcR, which are classified based on the type of antibody that they recognize The Latin letter used to identify a type of antibody is converted into the corresponding Greek letter, which is placed after the 'Fc' part of the name For example, those that bind the most common class of antibody, IgG, are called Fc-gamma receptors FcγR, those that bind IgA are called Fc-alpha receptors FcαR and those that bind IgE are called Fc-epsilon receptors FcεR The classes of FcR's are also distinguished by the cells that express them macrophages, granulocytes, natural killer cells, T and B cells and the signalling properties of each receptor

Fc-gamma receptors

All of the Fcγ receptors FcγR belong to the immunoglobulin superfamily and are the most important Fc receptors for inducing phagocytosis of opsonized marked microbes This family includes several members, FcγRI CD64, FcγRIIA CD32, FcγRIIB CD32, FcγRIIIA CD16a, FcγRIIIB CD16b, which differ in their antibody affinities due to their different molecular structure For instance, FcγRI binds to IgG more strongly than FcγRII or FcγRIII does FcγRI also has an extracellular portion composed of three immunoglobulin Ig-like domains, one more domain than FcγRII or FcγRIII has This property allows FcγRI to bind a sole IgG molecule or monomer, but all Fcγ receptors must bind multiple IgG molecules within an immune complex to be activated

The Fc-gamma receptors differ in their affinity for IgG and likewise the different IgG subclasses have unique affinities for each of the Fc gamma receptors These interactions are further tuned by the glycan oligosaccharide at position CH2-844 of IgG For example, by creating steric hindrance, fucose containing CH2-844 glycans reduce IgG affinity for FcγRIIIA In contrast, G0 glycans, which lack galactose and terminate instead with GlcNAc moieties, have increased affinity for FcγRIIIA

Another FcR is expressed on multiple cell types and is similar in structure to MHC class I This receptor also binds IgG and is involved in preservation of this antibody However, since this Fc receptor is also involved in transferring IgG from a mother either via the placenta to her fetus or in milk to her suckling infant, it is called the neonatal Fc receptor FcRn Recently, research suggested that this receptor plays a role in the homeostasis of IgG serum levels

Fc-alpha receptors

Only one Fc receptor belongs to the FcαR subgroup, which is called FcαRI or CD89 FcαRI is found on the surface of neutrophils, eosinophils, monocytes, some macrophages including Kupffer cells, and some dendritic cells It is composed of two extracellular Ig-like domains, and is a member of both the immunoglobulin superfamily and the multi-chain immune recognition receptor MIRR family It signals by associating with two FcRγ signaling chains Another receptor can also bind IgA, although it has higher affinity for another antibody called IgM This receptor is called the Fc-alpha/mu receptor Fcα/μR and is a type I transmembrane protein With one Ig-like domain in its extracellular portion, this Fc receptor is also a member of the immunoglobulin superfamily

Fc-epsilon receptors

Two types of FcεR are known:

  • the high-affinity receptor FcεRI is a member of the immunoglobulin superfamily it has two Ig-like domains FcεRI is found on epidermal Langerhans cells, eosinophils, mast cells and basophils As a result of its cellular distribution, this receptor plays a major role in controlling allergic responses FcεRI is also expressed on antigen-presenting cells, and controls the production of important immune mediators called cytokines that promote inflammation
  • the low-affinity receptor FcεRII CD23 is a C-type lectin FcεRII has multiple functions as a membrane-bound or soluble receptor; it controls B cell growth and differentiation and blocks IgE-binding of eosinophils, monocytes, and basophils

Summary table

Receptor name Principal antibody ligand Affinity for ligand Cell distribution Effect following binding to antibody
FcγRI CD64 IgG1 and IgG3 High Kd ~ 10−9 M Macrophages
Neutrophils
Eosinophils
Dendritic cells
Phagocytosis
Cell activation
Activation of respiratory burst
Induction of microbe killing
FcγRIIA CD32 IgG Low Kd > 10−7 M Macrophages
Neutrophils
Eosinophils
Platelets
Langerhans cells
Phagocytosis
Degranulation eosinophils
FcγRIIB1 CD32 IgG Low Kd > 10−7 M B Cells
Mast cells
No phagocytosis
Inhibition of cell activity
FcγRIIB2 CD32 IgG Low Kd > 10−7 M Macrophages
Neutrophils
Eosinophils
Phagocytosis
Inhibition of cell activity
FcγRIIIA CD16a IgG Low Kd > 10−6 M NK cells
Macrophages certain tissues
Induction of antibody-dependent cell-mediated cytotoxicity ADCC
Induction of cytokine release by macrophages
FcγRIIIB CD16b IgG Low Kd > 10−6 M Eosinophils
Macrophages
Neutrophils
Mast cells
Follicular dendritic cells
Induction of microbe killing
FcεRI IgE High Kd ~ 10−10 M Mast cells
Eosinophils
Basophils
Langerhans cells
Monocytes
Degranulation
Phagocytosis
FcεRII CD23 IgE Low Kd > 10−7 M B cells
Eosinophils
Langerhans cells
Possible adhesion molecule
IgE transport across human intestinal epithelium
Positive-feedback mechanism to enhance allergic sensitization B cells
FcαRI CD89 IgA Low Kd > 10−6 M Monocytes
Macrophages
Neutrophils
Eosinophils
Phagocytosis
Induction of microbe killing
Fcα/μR IgA and IgM High for IgM, Mid for IgA B cells
Mesangial cells
Macrophages
Endocytosis
Induction of microbe killing
FcRn IgG Monocytes
Macrophages
Dendritic cells
Epithelial cells
Endothelial cells
Hepatocytes
Transfers IgG from a mother to fetus through the placenta
Transfers IgG from a mother to infant in milk
Protects IgG from degradation

Functions

An antibody has Fab fragment, antigen-binding and Fc fragment, crystallizable regions Fc receptors bind to the Fc region

Fc receptors are found on a number of cells in the immune system including phagocytes like macrophages and monocytes, granulocytes like neutrophils and eosinophils, and lymphocytes of the innate immune system natural killer cells or adaptive immune system eg, B cells They allow these cells to bind to antibodies that are attached to the surface of microbes or microbe infected cells, helping these cells to identify and eliminate microbial pathogens The Fc receptors bind the antibodies at their Fc region or tail, an interaction that activates the cell that possesses the Fc receptor Activation of phagocytes is the most common function attributed to Fc receptors For example, macrophages begin to ingest and kill an IgG-coated pathogen by phagocytosis following engagement of their Fcγ receptors Another process involving Fc receptors is called antibody-dependent cell-mediated cytotoxicity ADCC During ADCC, FcγRIII receptors on the surface of natural killer NK cells stimulate the NK cells to release cytotoxic molecules from their granules to kill antibody-covered target cells FcεRI has a different function FcεRI is the Fc receptor on granulocytes, that is involved in allergic reactions and defense against parasitic infections When an appropriate allergic antigen or parasite is present, the cross-linking of a least two of IgE molecules and their Fc receptors on the surface of a granulocyte will trigger the cell to rapidly release preformed mediators from its granules

Signaling mechanisms - Fc gamma receptors

Activation

Fc gamma receptors generate signals within their cells through an important activation motif known as an Immunoreceptor tyrosine-based activation motif ITAM An ITAM is a specific sequence of amino acids YXXL occurring twice in close succession in the intracellular tail of a receptor When phosphate groups are added to the tyrosine Y residue of the ITAM by enzymes called tyrosine kinases, a signaling cascade is generated within the cell This phosphorylation reaction typically follows interaction of an Fc receptor with its ligand An ITAM is present in the intracellular tail of FcγRIIA, and its phosphorylation induces phagocytosis in macrophages FcγRI and FcγRIIIA do not have an ITAM but can transmit an activating signal to their phagocytes by interacting with another protein that does This adaptor protein is called the Fcγ subunit and, like FcγRIIA, contains the two YXXL sequences that are characteristic of an ITAM

Inhibition

The presence of only one YXXL motif is not sufficient to activate cells, and represents a motif I/VXXYXXL known as an immunoreceptor tyrosine-based inhibitory motif ITIM FcγRIIB1 and FcγRIIB2 have an ITIM sequence and are inhibitory Fc receptors; they do not induce phagocytosis Inhibitory actions of these receptors are controlled by enzymes that remove phosphate groups from tyrosine residues; the phosphatases SHP-1 and SHIP-1 inhibit signaling by Fcγ receptors Binding of ligand to FcγRIIB leads to phosphorylation of the tyrosine of the ITAM motif This modification generates the binding site for the phosphatase, a SH2 recognition domain The abrogation of ITAM activation signaling is caused by inhibition of protein tyrosine kinases of Src family, and by hydrolyzing the membrane PIP3 interrupting the further downstream signaling by the activating receptors, such as activating FcγRs, TCR, BCR and cytokine receptors eg c-Kit

The negative signaling by FcγRIIB is mainly important for regulation of activated B cells The positive B cell signaling is initiated by binding of foreign antigen to surface immunoglobulin The same antigen-specific antibody is secreted and it can feedback-suppress, or promote negative signaling This negative signaling is being provided by FcγRIIB: Experiments using B cell deletion mutants and dominant-negative enzymes have firmly established an important role for SH2-domain-containing inositol 5-phosphatase SHIP in negative signaling Negative signaling through SHIP appears to inhibit the Ras pathway through SH2 domain competition with Grb2 and Shc and may involve consumption of intracellular lipid mediators that act as allosteric enzyme activators or that promote entry of extracellular Ca2+

Cellular activation

Fc receptors recognize microbes that have been bound by antibodies The interaction between the bound antibodies and the cell surface Fc receptor activates the immune cell to kill the microbe This example shows the phagocytosis of an opsonized microbe

On phagocytes

When IgG molecules, specific for a certain antigen or surface component, bind to the pathogen with their Fab region fragment antigen binding region, their Fc regions point outwards, in direct reach of phagocytes Phagocytes bind those Fc regions with their Fc receptors Many low affinity interactions are formed between receptor and antibody that work together to tightly bind the antibody-coated microbe The low individual affinity prevents Fc receptors from binding antibodies in the absence of antigen, and therefore reduces the chance of immune cell activation in the absence of infection This also prevents agglutination clotting of phagocytes by antibody when there is no antigen After a pathogen has been bound, interactions between the Fc region of the antibody and the Fc receptors of the phagocyte results in the initiation of phagocytosis The pathogen becomes engulfed by the phagocyte by an active process involving the binding and releasing of the Fc region/Fc receptor complex, until the cell membrane of the phagocyte completely encloses the pathogen

On NK cells

The Fc receptor on NK cells recognize IgG that is bound to the surface of a pathogen-infected target cell and is called CD16 or FcγRIII Activation of FcγRIII by IgG causes the release of cytokines such as IFN-γ that signal to other immune cells, and cytotoxic mediators like perforin and granzyme that enter the target cell and promote cell death by triggering apoptosis This process is known as antibody-dependent cell-mediated cytotoxicity ADCC FcγRIII on NK cells can also associate with monomeric IgG ie, IgG that is not antigen-bound When this occurs, the Fc receptor inhibits the activity of the NK cell

On mast cells

Activation of mast cell degranulation by IgE interaction with FcεRI 1 = antigen; 2 = IgE; 3 = FcεRI; 4 = preformed mediators histamine, proteases, chemokines, heparin; 5 = granules; 6 – mast cell; 7 – newly formed mediators prostaglandins, leukotrienes, thromboxanes, platelet-activating factor

IgE antibodies bind to antigens of allergens These allergen-bound IgE molecules interact with Fcε receptors on the surface of mast cells Activation of mast cells following engagement of FcεRI results in a process called degranulation, whereby the mast cell releases preformed molecules from its cytoplasmic granules; these are a mixture of compounds including histamine, proteoglycans, and serine proteases Activated mast cells also synthesize and secrete lipid-derived mediators such as prostaglandins, leukotrienes, and platelet-activating factor and cytokines such as interleukin 1, interleukin 3, interleukin 4, interleukin 5, interleukin 6, interleukin 13, tumor necrosis factor-alpha, GM-CSF, and several chemokines These mediators contribute to inflammation by attracting other leukocytes

On eosinophils

Large parasites like the helminth worm Schistosoma mansoni are too large for ingestion by phagocytes They also have an external structure called an integument that is resistant to attack by substances released by macrophages and mast cells However, these parasites can become coated with IgE and recognized by FcεRI on the surface of eosinophils Activated eosinophils release preformed mediators such as major basic protein, and enzymes such as peroxidase, against which helminths are not resistant The interaction of the FcεRI receptor with the Fc portion of helminth bound IgE causes the eosinophil to release these molecules in a mechanism similar to that of the NK cell during ADCC

See also

  • Fc receptor-like molecule

References

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Further reading

  • Laneway, Charles A; Travers, Paul; Waldport, Mark; Shlomchik, Mark J 2001 "Chapter 9 The Humoral Immune Response" Immunobiology: The Immune System in Health and Disease 5th ed New York: Garland ISBN 978-0-8153-3642-6 
  • Abbas AK, Lichtman AH, Pillai S 2012 "Chapter 12: Effector Mechanisms of Humoral Immunity" Cellular and molecular immunology 7th ed Philadelphia: Elsevier/Saunders ISBN 978-1-4377-1528-6 
  • Gerber JS, Mosser DM Feb 2001 "Stimulatory and inhibitory signals originating from the macrophage Fcgamma receptors" Microbes and Infection / Institut Pasteur 3 2: 131–9 doi:101016/s1286-45790001360-5 PMID 11251299 
  • Maverakis E, Kim K, Shimoda M, Gershwin ME, Patel F, Wilken R, Raychaudhuri S, Ruhaak LR, Lebrilla CB Feb 2015 "Glycans in the immune system and The Altered Glycan Theory of Autoimmunity: a critical review" Journal of Autoimmunity 57: 1–13 doi:101016/jjaut201412002 PMC 4340844  PMID 25578468 

External links

  • Fc Receptor at the US National Library of Medicine Medical Subject Headings MeSH

fc receptor, fc receptor aggregation, fc receptor binding site, fc receptor blocking, fc receptor cross linking, fc receptor expression on human cells, fc receptor family, fc receptor igg, fc receptor signaling, fc receptor variants


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    29.10.2014


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