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Buenos Aires, Argentina

Vazquez H.,Small Bowel Section | De La Paz Temprano M.,Small Bowel Section | Sugai E.,Small Bowel Section | Scacchi S.M.,Small Bowel Section | And 11 more authors.
Canadian Journal of Gastroenterology and Hepatology | Year: 2015

BACKGROUND: Celiac disease (CD) is mostly recognized among subjects with a Caucasian ethnic ancestry. No studies have explored conditions predisposing Amerindians to CD. OBJECTIVE: To prospectively assess environmental, genetic and serological conditions associated with CD among members of the Toba native population attending a multidisciplinary sanitary mission. METHODS: An expert nutritionist determined daily gluten intake using an established questionnaire. Gene typing for the human leukocyte antigen (HLA) class II alleles was performed on DNA extracted from peripheral blood (HLA DQ2/DQ8 haplotype). Serum antibodies were immunoglobulin (Ig) A tissue transglutaminase (tTG) and the composite deamidated gliadin peptides/tTG Screen test. Positive cases were tested for IgA endomysial antibodies. RESULTS: A total of 144 subjects (55% female) were screened. The estimated mean gluten consumption was 43 g/day (range 3 g/day to 185 g/day). Genetic typing showed that 73 of 144 (50.7%) subjects had alleles associated with CD; 69 (94.5%) of these subjects had alleles for HLA DQ8 and four had DQ2 (5.5%). Four and six subjects had antibody concentrations above the cut-off established by the authors' laboratory (>3 times the upper limit of normal) for IgA tTG and deamidated gliadin peptides/tTG screen, respectively. Four of these had concomitant positivity for both assays and endomysial antibodies were positive in three subjects who also presented a predisposing haplotype. CONCLUSION: The present study was the first to detect CD in Amerindians. The native Toba ethnic population has very high daily gluten consumption and a predisposing genetic background. We detected subjects with persistent CD autoimmunity and, at least, three of them fulfilled serological criteria for CD diagnosis. © 2015 Pulsus Group Inc. All rights reserved. Source

Sugai E.,Small Bowel Section | Nachman F.,Small Bowel Section | Vaquez H.,Small Bowel Section | Gonzalez A.,Dr C Bonorino Udaondo Gastroenterology Hospital | And 8 more authors.
Digestive and Liver Disease | Year: 2010

Background: The usefulness of celiac disease-related serology in monitoring patients on a gluten-free diet has been debated. Aim: To describe serologic changes over time and assess whether serology tests can predict compliance with the gluten-free diet. Methods: Sera obtained at baseline and every 3 months thereafter for 1 year in 82 adult celiac disease patients were assayed for: (1) IgA antigliadin, (2) IgA anti-tissue transglutaminase, (3) IgA endomysial, (4) IgA, and (5) IgG anti-deamidated gliadin peptides, (6) dual detection of IgA and IgG anti-deamidated gliadin peptides, (7) a single assay for IgA and IgG of both anti-deamidated gliadin peptide and anti-tissue transglutaminase, and (8) IgA antiactin antibodies. Results: At 3 months after diagnosis, most antibody assays significant decrease in mean concentrations (p<0.0001) and the percentage of positive samples (p<0.0001) with further improvement in subsequent determinations. Strictly adherents had significantly lower concentrations of antibodies (p<0.01 to p<0.00001) and smaller proportion of positive samples for IgA endomysial, IgA antiactin antibodies and IgA antigliadin (15.6%, 17.4% and 23.9%, respectively) than partially compliant. At 1 year, IgA endomysial (p<0.02), IgA antiactin antibodies (p<0.05) and anti-tissue transglutaminase (p<0.02) predicted the degree of compliance. Conclusions: Gluten-free diet treatment produced rapid and significant qualitative and quantitative changes in celiac disease-related antibodies which may be useful for monitoring dietary compliance. © 2009 Editrice Gastroenterologica Italiana S.r.l. Source

Sugai E.,Small Bowel Section | Hwang H.J.,Small Bowel Section | Vazquez H.,Small Bowel Section | Smecuol E.,Small Bowel Section | And 7 more authors.
Clinical Chemistry | Year: 2010

BACKGROUND: Some patients with celiac disease (CD) may be seronegative with the commonly used test for IgA anti-tissue transglutaminase (anti-tTG) antibodies. Our aim was to explore whether newer assays incorporating synthetic deamidated gliadin-related peptides (DGPs) or other TG isoenzymes as antigen are useful for detecting gluten sensitivity in IgA anti-tTG-seronegative patients. METHODS: We assayed serum samples obtained at diagnosis from (a) anti-tTG-seronegative patients with a CD-like enteropathy (n = 12), (b) skin biopsy-proven dermatitis herpetiformis (DH) patients (n = 26), and (c) IgA anti-tTG-positive CD patients (n = 26). All patients had typical total IgA concentrations. All patients underwent intestinal biopsy and serum testing for (a) detection of IgA and IgG isotypes of both anti-DGP and anti-tTG in a single assay (tTG/DGP Screen; INOVA Diagnostics), (b) simultaneous detection of both IgA and IgG anti-DGP antibody isotypes (DGP Dual; INOVA Diagnostics), and (c) detection of antibodies to transglutaminase 3 (TG3) or transglutaminase 6 (TG6). RESULTS: All anti-tTG-seropositive patients also tested positive in anti-DGP assays. Overall, tTG/DGP Screen detected 6 (31.6%) of the 19 anti-tTG seronegatives, and anti-DGP Dual produced positive results in 5 (26.3%) of these cases. Whereas both assays detected 2 anti-tTG-negative DH patients with partial villous atrophy, they were positive in only 2 of the 5 cases with no histologically discernible mucosal damage. Testing for antibodies to TG3 and TG6 identified 7 (36.8%) of the 19 anti-tTG-negative patients, 5 of which were also positive for anti-DGP. CONCLUSIONS: Detection of anti-DGP with tTG/DGP Screen or anti-DGP Dual, or detection of antibodies to other TG isoenzymes, enhances the sensitivity for detecting gluten sensitivity among non-IgA-deficient, anti-tTG-seronegative patients with CD-like enteropathy. Source

Nachman F.,Small Bowel Section | Sugai E.,Small Bowel Section | Vazquez H.,Small Bowel Section | Gonzalez A.,Dr C Bonorino Udaondo Gastroenterology Hospital | And 9 more authors.
European Journal of Gastroenterology and Hepatology | Year: 2011

Objectives: The efficacy of celiac disease (CD)-related antibodies in monitoring clinical outcome of patients remains unclear. Our aims were to determine dynamics of antibodies after diagnosis and to assess their performances in monitoring patients' long-term compliance with the gluten-free diet (GFD). Methods: We prospectively estimated the performance of seven celiac disease-related antibody tests at diagnosis and at 1 year and more than 4 years after treatment initiation in 53 adults. The ability of antibodies to identify patients partially compliant to treatment was explored by the receiver operating characteristic curve analysis. The derived cut-off values ('compliance' cutoffs) were compared with cut-off values used for diagnosis ('diagnostic' cutoffs). The degree of compliance with the GFD was assessed using a standardized, multidisciplinary approach. Results: Concentrations of all antibodies decreased significantly at 1 year after diagnosis. The decline continued for more than 4 years in strictly compliant patients (P<0.05-0.001). The gap between 'compliance' and 'diagnostic' cut-offs values was wider at 1 year than at more than 4 years. The predictability of partial compliance determined by the area under receiver operating characteristic curves was relevant for most tests examined at 1 year (areas ranging: 0.64-0.72) and more than 4 years (0.58-0.78). Immunoglobulin A antibodies to deamidated gliadin peptides and tissue transglutaminase had the best performance for monitoring long-term compliance. Conclusion: Decreased concentrations of antibodies were significantly associated with the degree of compliance with the GFD. Immunoglobulin A antibodies to deamidated gliadin peptides and tissue transglutaminase had the best and more consistent performances. The serial measurement of antibody levels seems to be more reliable in monitoring compliance than the positive/negative expression of results. © 2011 Wolters Kluwer Health | Lippincott Williams & Wilkins. Source

Nachman F.,Small Bowel Section | del Campo M.P.,Small Bowel Section | Gonzalez A.,Small Bowel Section | Corzo L.,Small Bowel Section | And 8 more authors.
Digestive and Liver Disease | Year: 2010

Background: Deterioration of quality of life in the long term has been suggested for celiac disease patients on a gluten-free diet. Aims: To determine long-term quality of life of celiac disease patients and to assess the benefits of gluten-free diet compliance. Patients: We prospectively evaluated 53 newly diagnosed adult celiac disease patients. Methods: The Short Form 36 Health Survey, the Gastrointestinal Symptoms Rating Scale and the Beck Depression Inventory were employed at the time of diagnosis, 1 year, and beyond 4 years (median: 53 months) on treatment. Results: At 1 year, a significant improvement from baseline in quality of life indicators was observed (p< 0.001 to p< 0.0001) with comparable scores to healthy subjects. At 4 years, the Short Form 36 Health Survey scores (p< 0.002 to p< 0.0002) and Beck Depression Inventory score (p< 0.002) show significant deterioration compare with 1 year. Most scores remained significantly better than those at diagnosis (p< 0.03 to p< 0.0005). No changes were detected in the Gastrointestinal Symptoms Rating Scale scores. The long-term impairment of quality of life was attributable to the deterioration of most dimensions in patients who were not strictly compliant with the gluten-free diet (p< 0.05 to p< 0.001). Conclusions: Long-term deterioration of quality of life outcomes after the first year of gluten-free diet was associated with the lack of strict compliance with the diet. © 2010 Editrice Gastroenterologica Italiana S.r.l. Source

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