Nickel Allergy and Systemic Nickel Allergy Syndrome in Non Celiac Wheat Sensitivity

Study Results

Results pending

The study team has not published outcome measurements, participant flow, or safety data for this trial yet. Check back later for updates.

Basic Information

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Recruitment Status

COMPLETED

Total Enrollment

200 participants

Study Classification

OBSERVATIONAL

Study Start Date

2001-01-31

Study Completion Date

2016-03-31

Brief Summary

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In the last few years, a new clinical entity has emerged which includes patients who consider themselves to be suffering from problems caused by wheat and/or gluten ingestion, even though they do not have celiac disease (CD) or wheat allergy. This clinical condition has been named non-celiac gluten sensitivity (NCGS), although in a recent article, the investigators suggested the term "non-celiac wheat sensitivity" (NCWS), because it is not known to date what component of wheat actually causes the symptoms. Nickel is the fourth most used metal and the most frequent cause of contact allergy in the industrialized world. As a natural element of the earth's crust small amounts are found in water, soil, and natural foods, especially plant ones. Nickel allergy not only affects the skin but also results in systemic manifestations. Systemic nickel allergy syndrome can have cutaneous (urticaria/angioedema, flares, itching), and/or gastrointestinal (meteorism, colic, diarrhoea) signs and symptoms. In this study, the investigators evaluated 1) the frequency of Nickel allergy and Systemic Nickel allergy syndrome in NCWS patients, and 2) the clinical, serological, and histological characteristics of NCWS patients with contact dermatitis Nickel positive in comparison to NCWS patients without contact dermatitis.

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Detailed Description

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In the last few years, a new clinical entity has emerged which includes patients who consider themselves to be suffering from problems caused by wheat and/or gluten ingestion, even though they do not have celiac disease (CD) or wheat allergy. This clinical condition has been named non-celiac gluten sensitivity (NCGS), although in a recent article, the investigators suggested the term "non-celiac wheat sensitivity" (NCWS), because it is not known to date what component of wheat actually causes the symptoms. Other areas of doubt in NCWS regard its pathogenesis, while some papers reported intestinal immunologic activation, others linked NCWS to the dietary short chain carbohydrate (fermentable oligo-di-monosaccharides and polyols, FODMAPs) load. The investigators recently demonstrated that higher proportions of patients with NCWS develop autoimmune disorders, are antinuclear antibodies (ANA) positive, and show DQ2/DQ8 haplotypes compared with patients with irritable bowel syndrome (IBS), supporting an immunologic involvement in NCWS. Furthermore, some papers reported also a high frequency, ranging from 22% and 35%, of coexistent atopic diseases in NCWS patients, and the investigators suggested that a percentage of NCWS patients could really suffer from non-IgE-mediated wheat allergy.

Nickel is the fourth most used metal and the most frequent cause of contact allergy in the industrialized world. As a natural element of the earth's crust small amounts are found in water, soil, and natural foods, especially plant ones. Nickel allergy not only affects the skin but also results in systemic manifestations. Systemic nickel allergy syndrome can have cutaneous (urticaria/angioedema, flares, itching), and/or gastrointestinal (meteorism, colic, diarrhoea) signs and symptoms.

Volta et al. reported that 15% of NCWS patients suffered from allergy to nickel, but they did not further characterize this subgroup of patients, neither posed the NCWS diagnosis by means the double-blind placebo controlled challenge (DBPCC), as recommended. In this study, the investigators evaluated 1) the frequency of Nickel allergy and Systemic Nickel allergy syndrome in NCWS patients, and 2) the clinical, serological, and histological characteristics of NCWS patients with contact dermatitis Nickel positive in comparison to NCWS patients without contact dermatitis.

Conditions

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Non Celiac Wheat Sensitivity

Study Design

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Observational Model Type

CASE_ONLY

Study Groups

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Retrospective NCWS patients

The clinical charts of NCWS patients attending the outpatient centers of the Department of Internal Medicine at the University Hospital of Palermo and the Department of Internal Medicine of the Hospital of Sciacca were retrospectively reviewed. Patients had all been diagnosed with NCWS between January 2001 and June 2011, by a DBPCC method, and included in a previously published study. These charts included specific sections for the presence of associated atopic diseases, including nickel allergy. In this way, the characteristics of the NCWS patients suffering from nickel allergy were compared with those of the NCWS patients who did not suffer from nickel allergy. Incomplete clinical charts were excluded.

No interventions assigned to this group

Prospective NCWS patients

The investigators also prospectively surveyed adult patients with functional gastroenterological symptoms according to the Rome III criteria, and a definitive diagnosis of NCWS. The patients were recruited between December 2014 and March 2016 at 3 centers: the two already mentioned and the Gastroenterology Unit of the ARNAS Civico Hospital of Palermo, Italy. Most of the patients had been referred due to gastrointestinal symptoms, the onset of which, they reported, could be related to wheat ingestion. Again, the characteristics of the NCWS patients suffering from nickel allergy were compared with those of the NCWS patients who did not suffer from nickel allergy.

No interventions assigned to this group

Retrospective NCWS control patients

To compare the frequency of nickel allergy in NCWS and non-NCWS patients, a control group composed of 70 irritable bowel syndrome (IBS) patients, was selected. These controls were randomly chosen by a computer-generated method from subjects diagnosed during the same period and age- (+/-2 years) and sex-matched (+/-5%) with the NCWS patients. The IBS controls had been receiving the same elimination diet as the NCWS patients and had not shown any clinical improvement; they belonged to the cohort of subjects the investigators had studied previously.

No interventions assigned to this group

Prospective NCWS control patients

As for the retrospective study, to compare the frequency of nickel allergy in NCWS and non-NCWS patients, a control group composed of 70 patients with functional gastroenterological symptoms, was selected, with the same criteria adopted for the retrospective study.

No interventions assigned to this group

Eligibility Criteria

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Inclusion Criteria

All the patients met the recently proposed criteria:

* negative serum anti-tissue transglutaminase and antiendomysium (EmA) IgA and IgG antibodies;
* absence of intestinal villous atrophy;
* IgE-mediated immunoallergy tests negative to wheat (skin prick tests and/or serum specific IgE detection).

Adjunctive criteria adopted in our patients were:

* resolution of the gastrointestinal symptoms on a standard elimination diet, without wheat, cow's milk, egg, tomato, chocolate, or other food(s) causing self-reported symptoms;
* symptom reappearance on double-blind placebo-controlled (DBPC) wheat challenge, performed as described previously. As in previous studies, DBPC cow's milk protein challenge and other "open" food challenges were also performed.

Exclusion Criteria

* age \< 18 years;
* positive EmA in the culture medium of the duodenal biopsies, even if the villi to crypts ratio in the duodenal mucosa was normal;
* self-exclusion of wheat from the diet and refusal to reintroduce it before entering the study;
* other organic cutaneous and/or gastrointestinal diseases;
* concomitant treatment with steroids and/or antihistamines.

Allergic contact dermatitis was diagnosed in patients showing local eczematous lesions on the skin in close contact with nickel-containing objects. Suspected systemic nickel allergy syndrome (SNAS), was defined as a reaction characterized not only by diffused eczematous lesions (systemic contact dermatitis) but also by extracutaneous signs and symptoms, mainly gastrointestinal, after ingestion of nickel-rich foods (i.e. tomato, cocoa, beans, mushrooms, vegetables, wheat flour, etc). In all cases, the diagnosis was confirmed by means of the epicutaneous patch tests which provoked delayed lesions.

Minimum Eligible Age

18 Years

Eligible Sex

ALL

Accepts Healthy Volunteers

No