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Retinoic acid acts as a selective human IgA switch factor.

Goo-Young Seo1, Young-Saeng Jang1, Jini Kim2

  • 1Department of Molecular Bioscience, College of Biomedical Science, Kangwon National University, Chuncheon 200-701, Republic of Korea.

Human Immunology
|July 5, 2014
PubMed
Summary

Retinoic acid (RA) significantly boosts IgA production in human B cells by promoting IgA isotype switching. This process primarily involves the retinoic acid receptor alpha (RARα) pathway.

Keywords:
B cellClass switchIgARARαRetinoic acid

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Area of Science:

  • Immunology
  • Molecular Biology

Background:

  • Retinoic acid (RA) is recognized for its role in mucosal immunity.
  • The precise mechanism of RA in human IgA synthesis remains unclear.

Purpose of the Study:

  • To investigate the role of retinoic acid (RA) in promoting IgA isotype switching in human B cells.

Main Methods:

  • Assessed IgA, IgM, and IgG production.
  • Measured germ-line IgA1 and IgA2 transcripts (GLTα1 and GLTα2) expression.
  • Utilized limiting dilution analysis to quantify IgA1-secreting B cell clones.
  • Employed retinoic acid receptor alpha (RARα) agonist (Am80) and antagonist (LE540).

Main Results:

  • RA increased IgA production and GLTα1/GLTα2 expression.
  • RA enhanced the frequency of IgA1-secreting B cell clones.
  • RA did not affect IgM or IgG production.
  • RARα activation increased IgA production, while RAR antagonism blocked RA's effect.

Conclusions:

  • Retinoic acid (RA) induces IgA isotype switching in human B cells.
  • The RARα pathway is the primary mediator of RA-induced IgA production.