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Development of an in vitro model system for studying the interaction of Equus caballus IgE with its high-affinity receptor FcεRI
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Human epidermal Langerhans cells express the high affinity receptor for immunoglobulin E (Fc epsilon RI)

T Bieber1, H de la Salle, A Wollenberg

  • 1Department of Dermatology, University of Munich Medical School, Germany.

The Journal of Experimental Medicine
|May 1, 1992
PubMed

Insights

Epidermal Langerhans cells (LC) express the high-affinity IgE receptor (Fc epsilon RI), previously found only on mast cells and basophils. This discovery offers new insights into allergic disease mechanisms involving antigen-presenting cells.

Area of Science:

  • Immunology
  • Dermatology
  • Cell Biology

Background:

  • Epidermal Langerhans cells (LC) bearing immunoglobulin E (IgE) are implicated in atopic disease genesis.
  • The specific IgE receptor on LC was previously unidentified, hindering understanding of allergen binding.
  • Identifying the IgE receptor on LC is crucial for elucidating cellular events in allergic responses.

Purpose of the Study:

  • To identify the high-affinity IgE receptor on epidermal Langerhans cells (LC).
  • To investigate the expression of Fc epsilon RI subunits (alpha, beta, gamma) in LC.
  • To compare Fc epsilon RI expression in LC with that of mast cells and basophils.

Main Methods:

  • Immunohistochemical staining of epidermal LC with antibodies against Fc epsilon RI alpha subunit.
  • Detection of Fc epsilon RI alpha and gamma transcripts in LC using RT-PCR.
  • Analysis of Fc epsilon RI beta subunit expression in LC, human basophils, and KU812 cell line.

Main Results:

  • Epidermal LC express the high-affinity IgE receptor, Fc epsilon RI.
  • LC react with antibodies specific for the Fc epsilon RI alpha subunit.
  • LC express transcripts for Fc epsilon RI alpha and gamma subunits, similar to human basophils.
  • LC express the Fc epsilon RI beta subunit, indicating the complete receptor structure.

Conclusions:

  • Human epidermal LC express the complete high-affinity IgE receptor (Fc epsilon RI).
  • This finding suggests a significant role for Fc epsilon RI on LC in antigen presentation and allergic diseases.
  • Opens new avenues for understanding the functional role of Fc epsilon RI in immune responses mediated by antigen-presenting cells.

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