Absence of somatization in non-coeliac gluten sensitivity

OBJECTIVE

In contrast to coeliac disease (CD), the mechanism behind non-coeliac gluten sensitivity (NCGS) is unclear. The aims of the study were to measure the presence of somatization, personality traits, anxiety, depression, and health-related quality of life in NCGS individuals compared with CD patients and healthy controls, and to compare the response to gluten challenge between NCGS and CD patients.

MATERIAL AND METHODS

We examined 22 CD patients and 31 HLA-DQ2+ NCGS patients without CD, all on a gluten-free diet. All but five CD patients were challenged orally for 3 days with gluten; symptom registration was performed during challenge. A comparison group of 40 healthy controls was included. Patients and healthy controls completed questionnaires regarding anxiety, depression, neuroticism and lie, hostility and aggression, alexithymia and health locus of control, physical complaints, and health-related quality of life.

RESULTS

The NCGS patients reported more abdominal (p = 0.01) and non-abdominal (p < 0.01) symptoms after gluten challenge than CD patients. There were no significant differences between CD and NCGS patients regarding personality traits, level of somatization, quality of life, anxiety, and depressive symptoms. The somatization level was low in CD and NCGS groups. Symptom increase after gluten challenge was not related to personality in NCGS patients.

CONCLUSIONS

NCGS patients did not exhibit a tendency for general somatization. Personality and quality of life did not differ between NCGS and CD patients, and were mostly at the same level as in healthy controls. NCGS patients reported more symptoms than CD patients after gluten challenge.

Assessing possible celiac disease by an HLA-DQ2-gliadin Tetramer Test

OBJECTIVES

Investigation of uncertain celiac disease (CD) in patients already on a gluten-free diet (GFD) is difficult. We evaluated HLA-DQ2-gliadin tetramers for detection of gluten-specific T cells in peripheral blood and histological changes in the duodenum after a short gluten challenge as a diagnostic tool.

METHODS

HLA-DQ2+ individuals on a GFD for at least 4 weeks were investigated; 35 with uncertain diagnosis, 13 CD patients, and 2 disease controls. All participants had a challenge with four slices of gluten-containing white bread, daily for 3 days (d1-d3). An esophagogastroduodenoscopy with biopsy sampling was done on d0 and d4. Biopsies were scored according to revised Marsh criteria. Peripheral blood CD4+ T cells were isolated, stained with HLA-DQ2-gliadin peptide tetramers, and analyzed by flow cytometry on d0 and d6.

RESULTS

After challenge, a positive tetramer test was seen in 11/13 CD patients. Four of these subjects also showed typical histological changes on challenge. Of the 35 patients with uncertain diagnosis, 3 were diagnosed with CD. Two of these three patients had both positive tetramer staining and histological changes in biopsies after challenge.

CONCLUSIONS

Tetramer staining for gluten-specific T cells is a sensitive method in detecting an immune response in CD patients after a short gluten challenge. The prevalence of CD in the group with self-prescribed GFD was about 10%.

No induction of anti-avenin IgA by oats in adult, diet-treated coeliac disease

OBJECTIVE

Coeliac disease is effectively treated with a gluten-free diet devoid of wheat, rye, barley and related cereals. Oats has until recently also been considered harmful but is now allowed in several countries. We have, however, identified three adult coeliac disease patients who developed a flare of active coeliac disease after ingestion of oats, which suggests that oats might not be entirely innocent in coeliac disease. It is known that patients with untreated coeliac disease have elevated IgA antibodies to oat prolamins. The objective of this study was to investigate whether levels of IgA against oats were increased in treated, adult coeliac disease patients.

MATERIAL AND METHODS

Serum was collected from 136 adult patients with treated coeliac disease and 139 controls. Eighty-two of the coeliac disease patients had been taking oats as part of their gluten-free diet for 6 months or more. IgA against oats avenin, wheat gliadin and tissue transglutaminase was tested with ELISA.

RESULTS

No significant differences were found in IgA against oats in oats-eating and non-oats-eating coeliac disease patients. Both groups had increased levels of IgA against wheat, oats and tissue transglutaminase compared to healthy controls. A significant positive correlation was found between anti-avenin and antigliadin IgA (p<0.0001), and between anti-avenin and anti-tissue transglutaminase IgA (p=0.0012).

CONCLUSIONS

Ingestion of oats does not cause increased levels of IgA against oats in adult coeliac disease patients on a gluten-free diet. The findings support the notion that most adult coeliac disease patients can tolerate oats.

Nateglinide improves postprandial hyperglycemia and insulin secretion in renal transplant recipients

BACKGROUND

Postprandial hyperglycemia (PPHG) frequently occurs among renal transplant recipients (RTR). Reduced early insulin response (EIR) after a meal leads to impaired suppression of endogenous glucose production and subsequently PPHG, which is a risk factor for cardiovascular disease. Nateglinide is a rapid acting insulin secretagogue inducing an EIR after a meal. Our main objective was to investigate the safety and effect of nateglinide treatment on postprandial plasma glucose excursions and insulin secretion in RTR with PPHG.

PATIENTS AND METHODS

A total of 14 Caucasian RTR with new-onset diabetes mellitus (NODM; n = 6) or impaired glucose tolerance (IGT; n = 8) were included. The insulin response and glucose excursions were measured for 240 min after a standardized liquid meal at baseline and after two-wk treatment with nateglinide.

RESULTS

Treatment with nateglinide was followed by a significant decrease in mean two-h plasma glucose from 10.5 mmol/L (3.1) to 7.6 mmol/L (2.1; p < 0.001) and a decline in total postprandial area under the curve (AUC) of glucose concentration (p < 0.001). Both estimated EIR and the late insulin response increased significantly (p = 0.008 and p = 0.003, respectively). No serious adverse event was observed during the study period.

CONCLUSIONS

Treating RTR with nateglinide for two-wk significantly improved PPHG, increased the insulin response following a standardized meal and was well tolerated.

Effect of elemental diet on mucosal immunopathology and clinical symptoms in type 1 refractory celiac disease

BACKGROUND & AIMS

Patients with celiac disease (CD) who do not improve or exhibit villous atrophy on a gluten-free diet may have type 1 refractory CD (RCD) with a polyclonal mucosal T-cell infiltrate, or type 2 RCD with a monoclonal infiltrate, also termed cryptic T-cell lymphoma. Both conditions are difficult to treat. Here we describe the effects of a nonimmunogenic elemental diet on clinical symptoms and mucosal immunopathology in type 1 RCD.

METHODS

Ten CD patients on a strict gluten-free diet were diagnosed with type 1 RCD after extensive clinical evaluation in a tertiary referral hospital. A 4-week amino-acid-based liquid elemental diet regimen was given with no other treatment, except in 1 patient who also received methotrexate. Duodenal biopsy specimens were obtained before and after treatment for histologic assessment, immunophenotyping of intraepithelial lymphocytes, T-cell receptor clonality, mucosal interleukin (IL)-15 expression, flow-cytometric analysis of interferon (IFN)-gamma-secreting T cells, and whole biopsy specimen IFN-gamma messenger RNA determination.

RESULTS

Nine patients completed the treatment; however, 1 patient did not tolerate the diet. Histologic improvement and reduced epithelial IL-15 were seen in 8 patients, whereas IFN-gamma-secreting mucosal T cells and IFN-gamma messenger RNA levels decreased in 4 and 7 patients, respectively. Clinical improvement was noted in 6 patients, with 1 patient showing normalization of hypoalbuminemia. Three patients could discontinue their total parenteral nutrition.

CONCLUSIONS

Persistent mucosal IFN-gamma and IL-15 production often occurs in type 1 RCD despite conventional treatment. Elemental diet is a therapeutic option that can provide long-term immunopathologic and clinical improvement of this difficult condition.

Dietary intakes differ between renal transplant recipients living in patient hotels versus home

OBJECTIVE

To compare dietary intake and health-related quality of life approximately 6 to 10 weeks after renal transplantation in patients living at home and at a patient hotel, and how the patients were following a heart-healthy diet according to the current American Heart Association guidelines.

DESIGN

Cross-sectional observational study.

SETTING

Outpatient clinic at Rikshospitalet University Hospital, Norway.

PATIENTS

Forty renal transplant patients, 20 patients (14 men and 6 women) in both groups. There were 4 diabetic patients in each group.

METHODS

Dietary intake was assessed by 4-day dietary records. Health-related quality of life was investigated by the SF-36 questionnaire. The main outcome variables were daily energy intake and intakes of protein, total fat, saturated fat, cholesterol, fiber, and fruit and vegetables. The variables were tested by 2-sample t-tests, and significance was set at.05.

RESULTS

There was no statistically significant difference in daily energy intake between the groups (P =.08), but there were significantly higher daily intakes of protein (P =.003), total fat (P =.03), monounsaturated fat (P =.02), cholesterol (P =.04), fiber (P =.02), calcium (P =.03), and fruit and vegetables (P =.03) in the group living at the patient hotel. The mean intake of saturated fat was 14.5% of total energy in the group living at home and 14.6% in the group living at the patient hotel. There were no significant differences in health-related quality of life between the groups.

CONCLUSION

The results suggest that there are differences in dietary intake in renal transplant patients living at home compared with those at a patient hotel. It seems that neither of the groups follows current guidelines for reducing the risk of cardiovascular disease.

[Dietary treatment of coeliac disease and dermatitis herpetiformis]

Life-long gluten-free diet is the established therapy for coeliac disease and dermatitis herpetiformis. Diet therapy allows the intestinal mucosa to recover, improves nutrient malabsorption, osteoporosis and a weakened general condition. A gluten-free diet is without wheat, rye and barley and related products. Oats tested free of contamination by other cereals has recently been allowed for adult coeliac patients, but concern still remains regarding its general safety. Gluten-free flour mixes contain more starch and less proteins, vitamins, minerals and fibre compared to regular flour. Recently some questions have been raised as to the nutritional quality of the gluten-free diet. Successful therapy with gluten-free diet requires motivation and dietary counselling, including knowledge of the nutritional value of foods, labelling of prepackaged foods and practical training in cooking. The local chapters of the Norwegian Coeliac Society are active partners, as are the clinical nutritionists that work in most major hospitals. The physician making the diagnosis has a duty to see to it that all coeliac patients get adequate dietary counselling and management.

Oats induced villous atrophy in coeliac disease

The current trend is to allow coeliac disease (CD) patients to introduce oats to their gluten free diet. We sought further data from the clinical setting with regards to oats consumption by coeliac patients. Several oat products were tested for wheat contamination using a commercial enzyme linked immunoassay (ELISA) kit, and six samples were examined by an ELISA using a cocktail of monoclonal antibodies, mass spectrometry, and western blot analysis. Nineteen adult CD patients on a gluten free diet were challenged with 50 g of oats per day for 12 weeks. Serological testing and gastroduodenoscopy was performed before and after the challenge. Biopsies were scored histologically and levels of mRNA specific for interferon gamma were determined by reverse transcription-polymerase chain reaction analysis. Oats were well tolerated by most patients but several reported initial abdominal discomfort and bloating. One of the patients developed partial villous atrophy and a rash during the first oats challenge. She subsequently improved on an oats free diet but developed subtotal villous atrophy and dramatic dermatitis during a second challenge. Five of the patients showed positive levels of interferon gamma mRNA after challenge. Some concerns therefore remain with respect to the safety of oats for coeliacs.

[Dietary treatment of celiac disease]

Life-long gluten-free diet is the established therapy of coeliac disease. Patients suffering from dermatitis herpetiformis benefit from the same treatment. In Norway the gluten-free diet has excluded oats as well as wheat, rye and barley. The basis for this recommendation was a 1972 report indicating that ten out of 23 children consuming oats as part of their gluten-free diet for at least 18 months developed signs of damage to the intestinal mucosa. During the last decades, the clinical picture of coeliac disease has changed as a result of better diagnostic tools. Controlled clinical trials during the last few years indicate that some patients may tolerate small amounts of oats in their gluten-free diet. As a consequence, patients may be confused with regard to what dietary regime is recommended in coeliac disease. Compliance with gluten-free diet is important to secure growth and development, the all-round condition, fertility, bone density and a reduced risk of nutrient deficiency and malignancy. Consensus on dietary treatment is essential. A number of controlled trials are under way and the outcome of these studies will in a few years determine whether oats might be included in the standard gluten-free diet. So far oats are not recommended. The physician who makes the diagnosis is responsible for all patients getting adequate dietary counselling and management. Dietary advice given by health personnel must be consistent.

[Guidelines for diagnosis and follow-up of patients with celiac disease. Norwegian Coeliac Association]

The incidence and prevalence of coeliac disease in Norway is probably much higher than previously recognized. A prevalence of 1 per 676 individuals has been reported among adults in Norway. A much higher incidence has been documented in Sweden, both among children (one per approximately 300 liveborns) and among adults (1:256 healthy blood donors). Similar prevalence figures have been reported from Italy among young students. Eight new, biopsy-proven cases of coeliac disease were recently found by screening 2296 blood donors in Bergen (1:287). The symptoms of coeliac disease are often vague. Oligo- and asymptomatic cases often occur. The advisory council of the Norwegian Coeliac Association has established guidelines for the diagnostic work-up and for follow-up of patients with coeliac disease, in order to raise awareness of the disease, achieve a standardized work-up procedure and improve follow-up.

[Dietary information after radiotherapy of head and neck cancer]

After completed radiotherapy, 24 in-patients and 25 out-patients enrolled at the Department of Otolaryngology, National Hospital, were randomised to either tailored dietary information and instruction by a clinical nutritionist or regular dietary information from a nurse. At the six weeks follow-up examination the incidence of malnutrition, as evaluated by anthropometry and routine blood analyses, was lower among the patients who had been given intensive information than those who had received regular information (p < 0.05). Out-patients lost more weight than in-patients did (p < 0.05). The in-patients randomised to intensive dietary information were the only ones who did not lose weight. This study indicates a beneficial effect of intensive dietary advice in order to improve nutritional status after radiation treatment.

Increased insulin sensitivity and fibrinolytic capacity after dietary intervention in obese women with polycystic ovary syndrome

In overweight women with polycystic ovary syndrome (PCOS), increased insulin resistance has been observed. Since abdominal obesity is associated with impaired fibrinolytic capacity and elevated levels of plasminogen activator inhibitor (PAI-1) and since PAI-1 seems to be related to insulin resistance, we investigated the possible effects of dietary intervention on lipids, fibrinolysis, coagulation, and insulin sensitivity in obese PCOS women. Nine women aged 22 to 39 years (median weight, 97 kg) ate a protein-rich very-low-calorie diet (VLCD) (Nutrilett, Nycomed Pharma, Oslo, Norway; 421 kcal/d) for 4 weeks (part 1). After significant reductions of body fat (13%, P < .01), two of nine women achieved regular menstruation and became pregnant. Six of the remaining women continued on a conventional low-calorie diet (1,000 to 1,500 kcal/d) for the next 20 weeks (part 2), during which time they were generally able to preserve the body fat loss obtained in part 1 of the study. During part 1, significant reductions of total serum cholesterol (29%, P = .001) and fasting triglyceride ([TG] 31%, P < .05) levels were observed, as well as significant reductions of fasting glucose (6%, P < .05) and insulin (20%, P < .05). Insulin sensitivity (glucose disposal rate [GDR]) was increased by 93% (P < .05). After finishing part 2, insulin sensitivity was still significantly increased (86%, P < .05) and PAI-1 activity was significantly reduced (54%, P < .05). Moreover, overall fibrinolytic activity was significantly improved (serum D-dimer concentration increased by 75%, P < .05).(ABSTRACT TRUNCATED AT 250 WORDS)

Adverse reaction to food: assessment by double-blind placebo-controlled food challenge and clinical, psychosomatic and immunologic analysis

Double-blind placebo-controlled food challenge (DBPCFC) with food items applied in capsules was performed in a prospective study of 17 selected patients and 34 age- and sex-matched healthy controls in the interdisciplinary clinical setting. Protein immunoblotting showed no differences in antigenicity between foods in the capsules and the corresponding fresh foods. All patients reacted to one or more food substances during DBPCFC, with a doubtful reaction to placebo in 2 patients. Agreement between diet history and provocation was seen in 53 of 85 individual food challenges, 36 being positive with both examinations. In 22 (38%) of the 58 positive provocations, the reactions were not expected from the patients' histories. No reaction to food or placebo occurred in the control group. Related to diet history, sensitivity and specificity of provocation were 62 and 63%, respectively, with a positive predictive value of 78%. Allergy, previous gastroenterologic and infectious diseases among first-degree relatives, immunologic abnormalities and elevation of total IgE were significantly more common for the patients than controls. A positive skin prick test correlated well with diet history, but both prick test and food antibodies correlated poorly with DBPCFC. Assessment by the General Health Questionnaire showed a significant difference towards the controls. After 3-4 months of follow-up on an individually based diet, 11 of 15 patients reported general improvement of their condition. DBPCFC may be a valuable diagnostic test in addition to dietary history as a basis for elimination diet on food-intolerant patients. The effect of the elimination diet on the symptoms may also suggest a therapeutic effect or provocation.(ABSTRACT TRUNCATED AT 250 WORDS)

[Diet among patients with celiac disease. Do patients comply with a gluten-free diet?]

We studied dietary compliance retrospectively among 28 coeliac patients, 18 adults (15-68 years) and 10 children (1-14 years) by means of a self-administered frequency questionnaire. 50% of the participants ate foods that were not guaranteed to be gluten-free. Four adult patients (22%) with certainty did not keep to a strictly gluten-free diet. Lack of dietary compliance was not detected among children. The patients had received information on diet shortly after the disease had been diagnosed during the period 1964-81. The most frequent source of information about gluten-free diet was the physician, but information from the Norwegian Coeliac Association and from clinical nutritionists was rated as more useful. 24 patients reported experiencing social and practical problems related to the gluten-free diet.