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FcεRI: Wikis


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high affinity IgE receptor; alpha
Symbol FCER1A
Alt. symbols FcεRIα, FCE1A
Entrez 2205
HUGO 3609
OMIM 147140
RefSeq NM_002001
UniProt P12319
Other data
Locus Chr. 1 q23
high affinity IgE receptor; beta
Symbol MS4A2
Alt. symbols FcεRIβ, FCER1B, IGER, APY
Entrez 2206
HUGO 7316
OMIM 147138
RefSeq NM_000139
UniProt Q01362
Other data
Locus Chr. 1 q23
high affinity IgE receptor; gamma
Symbol FCER1G
Alt. symbols FcεRIγ
Entrez 2207
HUGO 3611
OMIM 147139
RefSeq NM_004106
UniProt P30273
Other data
Locus Chr. 1 q23

The high affinity IgE receptor, also known as FcεRI, or Fc epsilon RI, is the high-affinity receptor for immunoglobulin E (IgE), an antibody isotype involved in allergy and resistance to parasites. FcεRI is a tetrameric receptor complex consisting of one alpha (FcεRIα), one beta (FcεRIβ), and two gamma chains (FcεRIγ). It is expressed predominantly on mast cells and basophils.[1]


Tissue distribution

FcεRI is found on epidermal Langerhans cells, eosinophils, mast cells and basophils.[2][3] 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.[4]

Mechanism of action

Crosslinking of the FcεRI via IgE-allergen complexes leads to degranulation of mast cells or basophils and release of inflammatory mediators.[5] Under laboratory conditions degranulation of isolated basophils can also be induced with antibodies to the FcεRIα which crosslink the receptor. Such crosslinking and potentially pathogenic autoantibodies to the FcεRIα have been isolated from human cord blood, which suggest that they occur naturally and are present already at birth. However, their epitope on FcεRIα was masked by IgE and the affinity of the corresponding autoantibodies found in healthy adults appeared lowered.[6]


  1. ^ Pawankar R (February 2001). "Mast cells as orchestrators of the allergic reaction: the IgE-IgE receptor mast cell network". Curr Opin Allergy Clin Immunol 1 (1): 3–6. PMID 11964662.  
  2. ^ Ochiai K, Wang B, Rieger A, Kilgus O, Maurer D, Födinger D, Kinet J, Stingl G, Tomioka H (1994). "A review on Fc epsilon RI on human epidermal Langerhans cells". Int Arch Allergy Immunol 104 Suppl 1 (1): 63–4. PMID 8156009.  
  3. ^ Prussin C, Metcalfe D (2006). "5. IgE, mast cells, basophils, and eosinophils". J Allergy Clin Immunol 117 (2 Suppl Mini-Primer): S450–6. doi:10.1016/j.jaci.2005.11.016. PMID 16455345.  
  4. ^ von Bubnoff D, Novak N, Kraft S, Bieber T (2003). "The central role of FcepsilonRI in allergy". Clin Exp Dermatol 28 (2): 184–7. doi:10.1046/j.1365-2230.2003.01209.x. PMID 12653710.  
  5. ^ Siraganian RP (December 2003). "Mast cell signal transduction from the high-affinity IgE receptor". Curr. Opin. Immunol. 15 (6): 639–46. doi:10.1016/j.coi.2003.09.010. PMID 14630197.  
  6. ^ Bobrzynski T, Fux M, Vogel M, Stadler MB, Stadler BM, Miescher SM (November 2005). "A high-affinity natural autoantibody from human cord blood defines a physiologically relevant epitope on the FcepsilonRIalpha". J. Immunol. 175 (10): 6589–96. PMID 16272313.  

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