Food allergy, dermatologic diseases, and anaphylaxis
Evidence for a reduced histamine degradation capacity in a subgroup of patients with atopic eczema

https://doi.org/10.1016/j.jaci.2005.11.041Get rights and content

Background

A diminished histamine degradation based on a reduced diaminoxidase activity is suspected as a reason for non–IgE-mediated food intolerance caused by histamine. Atopic eczema (AE) is often complicated by relapses triggered by IgE-mediated allergy to different kinds of food. However, in a subgroup of patients with AE, allergy testing proves negative, although these patients report a coherence of food intake and worsening of AE and describe symptoms that are very similar to histamine intolerance (HIT).

Objectives

It was the aim of our study to evaluate symptoms of HIT in combination with diaminoxidase levels in a total of 360 individuals consisting of patients with AE (n = 162) in comparison with patients with HIT (n = 124) without AE and healthy control volunteers (n = 85).

Methods

Histamine plasma level was determined with an ELISA and diaminoxidase serum activity with the help of radio extraction assays using [3H]-labeled putrescine-dihydrochloride as a substrate. Detailed clinical evaluations of characteristic features of AE and HIT were performed.

Results

Reduced diaminoxidase serum levels leading to occurrence of HIT symptoms like chronic headache, dysmenorrhea, flushing, gastrointestinal symptoms, and intolerance of histamine-rich food and alcohol were significantly more common in patients with AE than in controls. Reduction of both symptoms of HIT and Severity Scoring of Atopic Dermatitis could be achieved by a histamine-free diet in the subgroup of patients with AE and low diaminoxidase serum levels.

Conclusion

Higher histamine plasma levels combined with a reduced histamine degradation capacity might influence the clinical course of a subgroup of patients with AE.

Clinical implications

As HIT emerges in a subgroup of patients with AE, a detailed anamnestic evaluation of food intolerance and HIT symptoms complemented by an allergological screening for food allergy, a diet diary, and, in confirmed suspicion of HIT, measurement of diaminoxidase activity and a histamine-free diet should be undertaken.

Section snippets

Characterization of patients

A total of 162 adult AE36 patients (age range, 14-86 years; average age, 31.42 ± 12.95 years; 106 female and 56 male) from the Department of Dermatology in Bonn, Germany, were analyzed regarding atopic status, and the severity of the disease was evaluated according to the Diepgen score,37 the criteria of Bos,38 the criteria of Hanifin and Rajka,39 and the Severity Scoring of Atopic Dermatitis (SCORAD) system,40 respectively. In parallel, typical clinical symptoms of HIT and a history of food

Symptoms of HIT occur in a subgroup of patients with AE

To analyze the frequency of HIT in patients with AE, we evaluated the occurrence of classical symptoms of HIT in patients with AE selected randomly by a standard questionnaire.

Symptoms of HIT such as chronic headache (P = .003; χ2 = 8.556), premenstrual headache and dysmenorrhea (P = .002; χ2 = 9.295), flushing (P < .001; χ2 = 24.67), gastrointestinal symptoms such as diarrhea, cramps, and meteorism (P < .001; χ2 = 38.89) and intolerance of food rich in or releasing histamine (P < .001; χ2 =

Discussion

Histamine intolerance is caused by a disproportion of the quantity of histamine and the capacity of histamine degradation. This can be a result of histamine overload and/or diaminoxidase deficiency. Exceeding the individual histamine tolerance gives rise to concentration-dependent histamine-mediated symptoms.43, 44 In sensitive patients, symptoms occur even after oral ingestion of small amounts of histamine that are well tolerated by healthy persons. Symptoms can manifest in multiple organs

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    Supported by grants from the Deutsche Forschungsgemeinschaft (DFG NO454/1-4 and DFG NO454/2-3) and a BONFOR grant of the University of Bonn. Dr Novak is supported by a Heisenberg-Fellowship, DFG NO454/3-1.

    Disclosure of potential conflict of interest: The authors have declared that they have no conflict of interest.

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