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The quest for ingested peanut protein in human serum.

Anja Pahlow Mose1,2, Ejvind Mortz3, Per Stahl Skov1,4

  • 1Odense Research Center for Anaphylaxis (ORCA), Odense University Hospital, Odense, Denmark.

Allergy
|November 13, 2019
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Summary

Systemic absorption of peanut protein occurs rapidly after ingestion, with detectable levels in the bloodstream for up to 48 hours. This study quantifies peanut protein absorption kinetics, providing evidence for its role in allergic reactions.

Keywords:
Ara h 2Ara h 6allergen absorption kineticsallergen quantification

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Area of Science:

  • Immunology
  • Allergy Research
  • Food Science

Background:

  • Mounting evidence suggests systemic uptake of food allergens triggers anaphylaxis.
  • Direct proof of allergen absorption and its kinetics in humans is lacking.
  • Understanding peanut allergen absorption is crucial for managing food allergies.

Purpose of the Study:

  • To quantify the systemic absorption of immunoreactive peanut protein in humans.
  • To determine the absorption kinetics of peanut protein following ingestion.
  • To investigate the relationship between peanut protein absorption and allergic responses.

Main Methods:

  • Development of quantitative protein assays including mass spectrometry, dot blots, and Western blotting.
  • Application of double monoclonal sandwich ELISA for quantifying absorbed Ara h 2 and Ara h 6.
  • Utilizing basophil histamine release assay and passive cutaneous anaphylaxis test to study absorption kinetics.

Main Results:

  • Protein assays were functional but lacked sensitivity for detecting minute Ara h 2 amounts in serum.
  • Detected Ara h 6 levels up to 0.2 ng/mL; Ara h 2 remained undetectable via ELISA.
  • Demonstrated rapid systemic absorption of immunoreactive peanut protein (≤5 minutes post-ingestion).
  • Peanut protein concentration peaked between 1-4 hours and circulated for at least 48 hours.

Conclusions:

  • Ingested peanut protein is absorbed systemically and retains immunoreactivity in human serum.
  • The precise quantities and implications for anaphylaxis elicitation require further elucidation.
  • This study provides foundational data on peanut allergen absorption kinetics in humans.