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Related Experiment Videos

IgE suppressor factor induced by phytohemagglutinin.

M I Astorquiza1, C Cisternas

  • 1Institute of Experimental Medicine, Universidad Austral de Chile, Valdivia.

International Archives of Allergy and Applied Immunology
|January 1, 1990
PubMed
Summary

Phytohemagglutinin (PHA) inoculation near immunization suppresses the IgE response, specifically the passive cutaneous anaphylactic (PCA) reaction, but not ELISA-measured IgE. This suppression is mediated by Lyt 1+ T cells, suggesting an IgE suppressor factor.

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Area of Science:

  • Immunology
  • Cellular immunology
  • Allergy research

Background:

  • Immunoglobulin E (IgE) plays a critical role in allergic reactions.
  • Phytohemagglutinin (PHA) is a plant lectin known to stimulate T lymphocytes.
  • Understanding the modulation of IgE responses is crucial for developing allergy treatments.

Purpose of the Study:

  • To investigate the effect of phytohemagglutinin (PHA) inoculation on the IgE response.
  • To determine the role of specific T cell subsets (Lyt 1+ and Lyt 2+) in PHA-induced IgE suppression.
  • To elucidate the mechanism underlying PHA-mediated modulation of IgE.

Main Methods:

  • Donor spleen cells were treated with PHA and T cell depletions (Lyt 1+ or Lyt 2+).
  • Cells were transferred to isogenic recipients, followed by immunization with ovalbumin.

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  • IgE response was assessed using passive cutaneous anaphylactic (PCA) reactions and ELISA.
  • IgM and IgG production were also measured.

    • Main Results:

    • PHA inoculation suppressed the IgE response as measured by PCA reactions.
    • IgE levels determined by ELISA were not affected by PHA treatment.
    • Depletion of Lyt 1+ T cells abrogated the suppressive effect of PHA.
    • An IgE suppressor factor, detected in sera, inhibited PCA reactions.

    Conclusions:

    • PHA inoculation induces a specific suppression of the IgE-mediated PCA reaction, not affecting overall IgE levels.
    • Lyt 1+ T cells are essential for mediating this PHA-induced IgE suppression.
    • The findings suggest the generation of a soluble IgE suppressor factor that targets the PCA reaction.