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Found 3 results

  1. Celiac.com 12/03/2018 - Biomarkers in blood samples are not effective indicators for diagnosis or monitoring of celiac disease. A team of researchers recently set out to assess biomarkers of celiac disease derived from neoepitopes of deamidated gliadin peptides (DGP) and tTG fragments, and to assess their usefulness in identifying patients with celiac disease with mucosal healing. The research team included RS Choung, SK Rostamkolaei, JM Ju, EV Marietta, CT Van Dyke, JJ Rajasekaran, V Jayaraman, T Wang, K Bei, KE Rajasekaran, K Krishna, HK Krishnamurthy, and JA Murray. They are variously affiliated with the Division of Gastroenterology and Hepatology, Mayo Clinic, Rochester, MN, USA; Vibrant Sciences LLC, San Carlos, CA, USA; and with the Division of Gastroenterology and Hepatology, Mayo Clinic, Rochester, MN, USA. The team began by analyzing serum samples from 90 patients with biopsy-proven celiac disease, along with 79 healthy control subjects for immune reactivity against the tTG-DGP complex. They used a fluorescent peptide microarray platform to estimate the antibody binding intensity of each synthesized tTG-DGP epitope. They validated results in 82 patients with newly diagnosed celiac disease, and in 217 control subjects. They assessed the ability of the peptide panel to spot patients with mucosal healing based on histologic results and using serum samples from 85 patients with treated and healed celiac disease; 81 patients with treated but unhealed celiac disease who showed villous atrophy despite adhering to a gluten-free diet; 82 patients with untreated celiac disease; 27 disease control subjects who showed villous atrophy without celiac disease; and 217 healthy control subjects. To assess their data, they relied on principal component analysis followed by machine learning and support vector machine modeling. In all, the team found 172 immunogenic epitopes of the tTG-DGP complex. Compared with control subjects, celiac patients showed substantially higher immune reactivity against these epitopes. In the test group, neoepitopes derived from the tTG-DGP complex identified people with celiac disease with a remarkable 99% sensitivity and 100% specificity. Blood samples from untreated celiac patients showed the greatest average antibody-binding intensity against the tTG-DGP complex. Blood from patients with treated but unhealed CeD mucosa (15.1 ± 7.5) showed significantly higher average antibody-binding intensity than blood from patients with treated and healed CeD mucosa (5.5±3.4) (P<.001). The test spotted celiac patients with healing mucosa with 84% sensitivity and 95% specificity. The research team discovered immunogenic epitopes of the tTG-DGP complex, and found that a test that measures immune response to epitopes accurately identified both celiac patients and patients with mucosal healing. From this study, the team concludes that the biomarker method for celiac testing could be useful in both the detection and monitoring of celiac disease. Read more at: Gastroenterology.
  2. Celiac.com 01/26/2017 - The only currently effective therapy for celiac disease is for patients to follow a gluten-free diet. However, no serum marker for gluten intake has yet been found, so it's not always easy for doctors to tell if patients are following their diets properly. A team of researchers recently set out to evaluate the use of alkylresorcinol concentrations for detecting dietary gluten intake in humans and mice. The research team included R. S. Choung, J. A. Murray, E. V. Marietta, C. T. Van Dyke, and A. B. Ross. They are variously affiliated with the Division of Gastroenterology and Hepatology, Mayo Clinic, Rochester, MN, USA, and with the Department of Biology and Biological Engineering, Chalmers University of Technology in Gothenburg, Sweden. For their study, they compared alkylresorcinol concentrations among 34 treated patients with celiac disease, 36 untreated celiac disease patients and 33 control subjects. They also evaluated seven additional celiac disease patients whose serum samples were available at diagnosis and after gluten-free diet. In mice, they compared alkylresorcinol concentrations in the serum of five mice fed a regular chow, and 10 mice fed lifelong with a gluten-free chow. In addition, They also assessed the effect of added gluten on alkylresorcinol concentrations. Their study indicates that serum alkylresorcinol concentrations could be a useful marker for dietary gluten in celiac disease. Certainly, having an easy, reliable way for doctors to spot dietary gluten will be useful in helping people with celiac disease maintain their required gluten-free diets. Source: Alimentary Pharmacology & Therapeutics. DOI: 10.1111/apt.13917
  3. Celiac.com 09/30/2009 - Are non-inflammatory gluten peptide analogs effective as biomarkers for celiac disease? Recent research indicates that they just might represent an effective new tool in the management of celiac disease. In the August 28th issue of Chemical Biology, a team of researchers from Stanford University's Department of Biochemistry issues a call for new tools to manage celiac disease, a lifelong immune disease of the small intestine. Non-inflammatory gluten peptide analogs may be one of the important new tools in that effort. The research team is made up of M. T. Bethune, M. Crespo-Bosque, E. Bergseng, K. Mazumdar, L. Doyle, K. Sestak, L. M. Sollid, and C. Khosla. They note that current drug trials are sparking a researchers to seek non-invasive biomarkers of gluten-induced intestinal change. They note also that they have synthesized and characterized non-inflammatory gluten peptide analogs in which Asn or His replace key Gln residues. As with their pro-inflammatory associates, these genetic markers resist gastrointestinal proteases, are susceptible to glutenases, and permeable across enterocyte barriers. In contrast with gluten peptides, however, the markers are not commonly acknowledged by transglutaminase, HLA-DQ2, or disease-specific T cells. In vitro and animal tests prove that the biomarkers can reveal shifts in intestinal permeability as well as glutenase-catalyzed gastric detoxification of gluten. As a result, they call for controlled clinical studies to assess the use of these peptides as markers for abnormal intestinal permeability in celiac patients and for the effectiveness of glutenase in clinical trial and treatment of celiac disease. Chem Biol. 2009 Aug 28;16(8):868-81.
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