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Related Experiment Videos

Cross-reactivity between mammalian proteins.

Patrizia Restani1, Barbara Beretta, Alessandro Fiocchi

  • 1Laboratory of Toxicology, Department of Pharmacological Sciences, University of Milan, Milan, Italy. patrizia.restani@unimi.it

Annals of Allergy, Asthma & Immunology : Official Publication of the American College of Allergy, Asthma, & Immunology
|December 19, 2002
PubMed
Summary

Food allergies can be triggered by cross-reactivity between similar proteins in milk and meat from different mammals. This study investigated cross-reactivity in mammalian food allergens, finding varying immune responses based on species.

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Area of Science:

  • Immunology and Food Science
  • Allergenicity and Cross-Reactivity Studies

Background:

  • Food allergen cross-reactivity arises from shared amino acid sequences or similar three-dimensional structures that bind specific antibodies.
  • Understanding cross-reactivity is crucial for managing food allergies, particularly those involving milk and meat proteins from various mammalian species.

Purpose of the Study:

  • To review laboratory data on cross-reactivity between mammalian milk and meat allergens.
  • To assess the specificity of animal monoclonal antibodies against common food allergens.

Main Methods:

  • Utilized immunoelectrophoresis techniques, including SDS-PAGE and immunoblotting.
  • Employed animal monoclonal antibodies for precise allergen detection and characterization.
  • Analyzed human immunoglobulin E (IgE) responses in children with milk allergies.

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Main Results:

  • Monoclonal antibodies to cow's milk proteins recognized proteins from sheep, goat, and buffalo milk, with weaker reactions to mare and donkey milk.
  • No cross-reactivity was observed with camel milk proteins, indicating species-specific differences.
  • Beef serum albumin antibodies cross-reacted with ovine serum albumin; broader cross-reactivity with other mammalian albumins correlated with phylogenetic relatedness and sequence identity to human serum albumin.

Conclusions:

  • The degree of immunogenic activity is influenced by variations in critical amino acid sequences (epitopes) between animal and human allergens.
  • Phylogenetic relationships and sequence homology are key factors determining the extent of cross-reactivity in mammalian food allergens.