Food and drug reactions and anaphylaxis
IgE antibody to fish gelatin (type I collagen) in patients with fish allergy

https://doi.org/10.1067/mai.2000.108499Get rights and content

Abstract

Background: Most children with anaphylaxis to measles, mumps, and rubella vaccines had shown sensitivity to bovine gelatin that was included in the vaccines. Recently, it was found that bovine type I collagen, which is the main content in the gelatin, is a major allergen in bovine gelatin allergy. Fish meat and skin also contain type I collagen. Objective: The present study was designed to investigate IgE antibody to fish gelatin in children with fish allergy. Methods: Serum samples were taken from patients in 3 groups: (1) 10 patients with fish allergy and specific IgE to fish meat; (2) two patients with allergies to both fish meat and bovine gelatin and specific IgE to fish meat and bovine gelatin; and (3) 15 patients with atopic dermatitis and specific IgE to fish meat. Various fish gelatins (type I collagen) were prepared from fish skin. IgE antibody to fish gelatin was analyzed by using ELISA and immunoblotting. Results: Of 10 patients with fish allergy, 3 had specific IgE to fish gelatin. Of two patients with fish allergy and bovine gelatin allergy, all had specific IgE to fish gelatin. Of 15 patients with atopic dermatitis and specific IgE to fish meat, 5 had specific IgE to fish gelatin. Furthermore, IgE from pooled serum of the patients reacted with both the α1 and α2 chains of fish type I collagen in immunoblots. There is cross-reactivity among gelatins from various fishes, but there is little cross-reactivity between fish and bovine gelatins. Conclusion: Some fish-sensitive patients possessed IgE antibody to fish gelatin. Fish gelatin (type I collagen) might be an allergen in subjects with fish allergy. (J Allergy Clin Immunol 2000;106:579-84.)

Section snippets

Patients

In this study patients were classified into 3 different groups: (1) 10 patients with fish allergy and specific IgE to fish meat (Table I); (2) two patients with allergies to both fish meat and bovine gelatin and specific IgE to fish meat and bovine gelatin (Table II); and (3) 15 patients with atopic dermatitis and specific IgE to fish meat (Table III). We measured specific IgE to cod and tuna meat in 65 patients with atopic dermatitis and selected 15 patients who had specific IgE to cod or

Purification of type I collagen from bovine and fish skin

Each type I collagen was heat denatured at 100°C for 10 minutes and electrophoresed in 5% gel SDS-PAGE (Fig 1). Bovine type I collagen is a heterotrimer composed of two α1 chains and one α2 chain. The α chains from fish type I collagen showed two bands; the higher band was the α1 chain, and the lower band was the α2 chain. The β chains showed two bands; the higher band consisted of two α1 chains, and the lower band consisted of α1 and α2 chains. In spite of heat treatment and reduction, a small

Discussion

Kelso et al7 and Wahl and Kleinhans23 reported that gelatin causes food allergy. Also, we reported that 26 children had anaphylaxis to vaccine and anti-bovine gelatin IgE, and 7 had food allergy to bovine gelatin.10 In our previous study we investigated IgE reactivity to gelatins from various animals in the bovine gelatin–sensitive children.17 We found that one child showed IgE reactivity to fish gelatin. It is possible that fish gelatin might be one of the allergens in fish allergy.

In this

Acknowledgements

We thank the physicians for their help in the serum sampling.

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    Reprint request: Masahiro Sakaguchi, PhD, Department of Immunology, National Institute of Infectious Diseases, Toyama 1-23-1, Shinjuku-ku, Tokyo 162, Japan.

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