Lack of immunogenicity of hydrolysed wheat flour in patients with coeliac disease after a short-term oral challenge

BACKGROUND

A gluten-free diet is currently the only reliable therapeutic strategy that is approved for coeliac disease (CD). For many patients, however, compliance remains inadequate.

AIM

To investigate the immunogenicity of wheat flour that was pre-treated with selected lactobacilli and fungal proteases (hydrolysed wheat gluten) in coeliac patients.

METHODS

The immunogenicity of hydrolysed wheat gluten was evaluated both in vitro in intestinal T cell lines (TCLs) and in vivo in treated CD patients after a short-term gluten challenge. Twenty treated CD patients were enrolled and equally randomised into two groups. The patients ate bread that was prepared with hydrolysed wheat flour or natural wheat flour (10 g of gluten/d for 3 days). The interferon (INF)-γ responses to natural gliadin and a 33-mer peptide were assessed by the enzyme-linked immunospot (ELISPOT) assay on peripheral blood mononuclear cells (PBMCs) both before and 6 days after the start of the challenge.

RESULTS

Hydrolysed wheat was not able to activate the TCLs from the coeliac intestinal mucosa. Consistent with the in vitro results, no significant increase in INF-γ secretion was observed in patients who consumed hydrolysed wheat flour. Conversely, the consumption of natural wheat gluten mobilised INF-γ secreting cells in the blood (P<.05).

CONCLUSIONS

We confirm that fermentation of wheat flour with sourdough lactobacilli and fungal proteases is capable of abolishing the T cell immunogenicity of gluten in coeliac patients. Our data also validate the short-term oral challenge as a useful tool for testing the efficacy of novel therapeutic approaches.

Diffusion of knowledge about Helicobacter pylori as assessed in an open-access endoscopy system: a prospective observational study based on the Maastricht guidelines

BACKGROUND/AIM

Aim of the present study is to assess, according to the guidelines of the Maastricht Consensus Conference, the appropriateness and diagnostic yield of upper gastrointestinal endoscopy in an open-access endoscopy system, in order to evaluate the diffusion of knowledge about Helicobacter pylori among different types of physicians.

METHODS

Patients undergoing endoscopy because of dyspeptic symptoms were prospectively considered in 21 endoscopy services of Campania during two different 1-week periods in 1998 and 2001. The following data were recorded: age, sex, symptoms, history of peptic ulcer with regard to previous endoscopic or radiographic examinations and treatment, endoscopic diagnosis, and H. pylori status. The indication for endoscopy was evaluated according to Maastricht guidelines and current medical knowledge.

RESULTS

In the two periods, 1998 and 2001, 706 and 520 patients were, respectively, considered. The two series were matched for demographic characteristics, symptoms, and endoscopic diagnosis. Endoscopy was considered not indicated in 398 patients (56.4%) in 1998 and in 265 patients (50.9%) in 2001 (p = NS). The majority of them, 288/398 (72.3%) in 1998 and 162/265 (61.1%) in 2001 (p = 0.001), had recently undergone endoscopy or radiology and empiric antisecretory treatment or eradication. They had been referred to endoscopy because of recurrence of symptoms or to assess healing. In 110 cases in 1998 (27.6%) and in 103 cases in 2001 (38.9%; p = 0.001) endoscopy was performed in dyspeptic patients younger than 45 years without alarm symptoms.

CONCLUSIONS

4 years after the Maastricht Conference, a large number of endoscopic examinations are not indicated and could be avoided following the Maastricht guidelines. In 2001, in comparison to 1998, a larger number of physicians are likely to investigate and treat correctly the H.-pylori-related diseases, but there are still some problems with the application of the 'test-and-treat policy'.

Endoscopic management of foreign bodies in the upper gastrointestinal tract: report on a series of 414 adult patients

BACKGROUND AND STUDY AIMS

Ingestion of foreign bodies is a common occurrence. Few papers in the literature report experience and outcome at tertiary centers. The aim of this paper is to report the management and the outcomes in 414 patients admitted for suspected ingestion of foreign body between May 1995 and December 1999.

METHODS

A plain radiographic film of the neck, chest or abdomen was obtained in the case of radiopaque objects, and in order to rule out suspected perforation: in such cases a computed tomography (CT) study was also performed. All patients were asked to give their informed consent, which was refused by three patients. Anesthesia was always used, either conscious sedation (86.8 %), or general anesthesia in the case of poor patient tolerance (13.2 %). All patients underwent an endoscopic procedure within six hours of admission. A flexible scope was used in all patients and a wide range of endoscopic devices was employed.

RESULTS

Foreign bodies were found in 64.5 % of our patients. Almost all were found in the esophagus. The types of foreign body were very different, but they were chiefly food boluses, bones or cartilages, dental prostheses or fish bones. In three patients (1.1 %) it was impossible to endoscopically remove the foreign body, which was located in the cervical esophagus: all these three patients required surgery. No complications relating to the endoscopic procedure were observed, but 30.7 % of patients had an underlying esophageal disease, such as a stricture. Only eight patients required a second endoscopic procedure, performed by a more experienced endoscopist.

CONCLUSION

Foreign body ingestion represents a frequent reason for emergency endoscopy. The endoscopic procedure is a successful technique which allows the removal of the foreign bodies in almost all cases without significant complications. Surgery is rarely required.