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Found 3 results

  1. Celiac.com 11/28/2018 - Patients with gluten ataxia without enteropathy have lower levels of antigliadin antibodies (AGA) compared to patients with celiac disease. Magnetic Resonance Spectroscopy (NAA/Cr area ratio) of the cerebellum improves in patients with gluten ataxia following a strict gluten-free diet, and is associated with an improvement in symptoms. A team of researchers recently set out to present their experience of the effect of a gluten-free diet in patients with ataxia and low levels of AGA antibodies measured by a commercial assay. The research team included Marios Hadjivassiliou, Richard A Grünewald, David S Sanders, Panagiotis Zis, Iain Croall, Priya D Shanmugarajah, Ptolemaios G Sarrigiannis, Nick Trott, Graeme Wild, and Nigel Hoggard. They are variously affiliated with the Academic Departments of Neurosciences and Neuroradiology; the Departments of Gastroenterology, the Departments of Dietetics; the Departments of Immunology, Sheffield Teaching Hospitals NHS Trust, in Sheffield, UK. The team conducted MR spectroscopy on 21 consecutive patients with ataxia and serum AGA levels below the positive cut-off for celiac disease, but above a re-defined cut-off in the context of gluten ataxia, at baseline and after a gluten-free diet. Of the 21 included patients with gluten ataxia, the team found that ten were on a strict gluten-free diet with elimination of AGA, 5 were on a gluten-free diet, but continued to have AGA, while 6 patients did not follow a gluten-free diet. The NAA/Cr area ratio from the cerebellar vermis increased in all patients on a strict gluten-free diet, increased in only 1 out of 5 patients on a gluten-free diet with persisting circulating AGA, and decreased in all patients who did not follow a gluten-free diet. From these results, the team concludes that patients with ataxia and low levels of AGA benefit from a strict gluten-free diet. The results suggest an urgent need to redefine the serological cut-off for circulating AGA in the diagnosis of gluten ataxia. Read more in Nutrients 2018, 10(10), 1444; doi:10.3390/nu10101444
  2. Celiac.com 03/05/2010 - A team of researchers recently studied therelationship between increased levels of antigliadin antibodies andintestinal barrier gene variants. The research team included V.M. Wolters, B. Z. Alizadeh, M. E. Weijerman, A. Zhernakova, I. M. vanHoogstraten, M. L. Mearin, M. C. Wapenaar, C.Wijmenga, M. W. Schreurs.They are affiliated with the Department of Pediatric Gastroenterology,UMC Utrecht, Utrecht, The Netherlands. Numerous genes may affectintestinal barrier function, including MAGI2, MYO9B, and PARD3, whichhave a close association with celiac disease. Gauging intestinalpermeability is tough to do, so researchers can test indirectly byusing antibodies against gliadin and Baker's yeast (anti-Saccharomycescerevisiae antibodies). The goal of the study was to determinewhether intestinal permeability, represented by antibodies againstgliadin, was connected to MAGI2, MYO9B, and PARD3. The teamanalyzed patients with Down syndrome, a population with suspectedincreased intestinal permeability. The team examined connectionsbetween AGA and ASCA. The team genotyped 126 Down syndromepatients for six single-nucleotide polymorphisms in MAGI2 (rs1496770,rs6962966, rs9640699), MYO9B (rs1457092, rs2305764), and PARD3(rs10763976). They then performed an allele dosage associationof these risk genes and AGA levels. They also found a strongcorrelation between AGA and ASCA (p < 0.01). Subjects withone or more risk genotypes showed lower average AGA levels (trend testp = 0.007) and made up a larger number of patients with normal AGAlevels (p = 9.3 x 10(-5)). Celiac-associated risk genotypesare associated with lower AGA values rather than higher AGA values.This all means that, regarding the increased prevalence of elevated AGAin patients with Down syndrome, there are other immunologic factors atplay. These may involve altered induction and/or maintenance oftolerance. Source: Hum Immunol. 2010 Feb 3.
  3. Eur J Gastroenterol Hepatol 2006;18:503-506. Celiac.com 08/14/2006 – A team of German researchers led by Dr. Martin W. Laass of the Childrens Hospital in Dresden have determined that antigliadin antibody (AGA) positivity disappears in over 50% of cases, and is therefore a poor marker for celiac disease. The researchers did follow up AGA testing on 69 adults and 47 children who participated in a much larger study conducted four years ago and found that only 26 of the adults and 21 of the children still had detectable levels of AGA in their blood samples, and none of them were positive for IgA-class anti-endomysial antibodies. Additionally no correlation was found in the subjects between their serum and fecal AGA. The researchers conclude that the appearance of AGA should be interpreted as a non-specific “immunomodulation phenomenon” that has low specificity as a diagnostic marker for celiac disease. The researchers emphasize that it is still unknown why the AGA markers are transient, but various conditions might account for it, including a change in the sensitivity of the test that was used in the original study conducted four years ago versus the one used in this study.
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