Short-term gluten challenge in children with coeliac disease does not impair spontaneous growth hormone secretion

Gluten-free diet impact on leptin levels in asymptomatic coeliac adolescents: one year of follow-up

Coeliac disease, daily more frequently diagnosed in our population, involves many organs also in oligosymptomatic patients and with an adequate nutritional regime. Possible endocrine implications include failure to thrive, pubertal delay and reproduction diseases due to deregulation of GH, FSH and LH secretion. Leptin, an adipose tissue hormone, can be decreased as well and its deficiency could be related to growth and puberty anomalies. We studied 14 asymptomatic coeliac patients in peripubertal age (7.5-13.8 years) and tested their leptin levels in order to correlate them with endocrine and anthropometric data. Before the diet was started leptinaemia (M+/-DS) was: 4.94+/-5.53 ng/ml. In 10/14 patients (71%) leptinaemia was<or=2 DS for gender and age. In all the patients, after a period of 6-12 months of gluten-free diet, Leptin levels appreciably raised to 10.8+/-7.9 ng/ml, with a significant correlation to the time of the diet. Leptinaemia was actually lower in patients with a severe mucosal atrophy, and in these patients it increased more significantly after the diet was started. The removal of gluten itself may reduce immunological hit to adipose tissue and the 'malnutrition' of adipocytes: leptin can hence increase despite no significant increase of body mass index occurs. This study could partially explain the correlation between body mass index, Coeliac disease and the deregulation of puberty and fertility, mainly in patients who started the diet late. It could also explain the reversibility of this alteration if the cause is removed.

Coeliac disease in children

Although coeliac disease (CD) can present at any age, including the elderly, typical cases often manifest in early childhood. The clinical spectrum in children is wide and includes: (1) typical cases presenting early in life with signs of intestinal malabsorption (chronic diarrhea, weight loss, abdominal distention, etc); (2) atypical cases showing milder, often extra-intestinal, symptoms; (3) silent cases that are occasionally discovered because of serological screening; (4) potential/latent cases showing isolated positivity of coeliac serology at first testing and eventually the typical intestinal damage later in life. Many CD-associated problems, which were originally described mostly in adults, can indeed be observed in children or adolescents, e.g. reduced bone mineral density, neurological problems and associated autoimmune disorders. It is instrumental that both primary pediatricians and pediatric subspecialists have a high degree of awareness and embrace a 'liberal' use of serological CD tests in order to identify these cases in a timely fashion to prevent serious complications secondary to untreated CD.

Celiac disease as a cause of growth retardation in childhood

PURPOSE OF REVIEW

Celiac disease is a syndrome characterized by damage of the small intestinal mucosa caused by the gluten fraction of wheat proteins and similar alcohol-soluble proteins (prolamines) of barley and rye in genetically susceptible subjects. The presence of gluten in these subjects leads to a self- perpetuating mucosal damage, and the elimination of gluten results in full mucosal recovery. The clinical manifestations of celiac disease are protean in nature and vary markedly with the age of the patient, the duration and extent of disease, and the presence of extraintestinal pathologic changes. In addition to the classic gastrointestinal form, a variety of other clinical manifestations of the disease have been described, including atypical and asymptomatic forms. Although the typical form of celiac disease, characterized by failure to thrive, is still the most frequent presentation in the pediatric age group, severe growth delay is less commonly seen in developed countries.

RECENT FINDINGS

Recent epidemiologic studies suggest that celiac disease-associated growth retardation is becoming a tangible health problem in developing countries, where the problem has been historically overlooked. Given the protean nature of the clinical presentation of celiac disease, the diagnosis is extremely challenging and relies on a sensitive and specific algorithm that allows the identification of different manifestations of the disease. Serologic tests developed in the past decade provide a noninvasive tool for screening individuals at risk for the disease as well as the general population.

SUMMARY

The current gold standard for the diagnosis of celiac disease remains histologic confirmation of the intestinal damage in serologically positive individuals. The keystone treatment of celiac disease patients is a lifelong elimination diet in which food products containing gluten are avoided.