title: Serum IgA antiendomysium antibody titers as a marker of intestinal involvement and diet compliance in adult celiac sprue.
abstract: IgA-class antiendomysium antibodies (IgA-EmAs) are a very sensitive and specific serological marker of celiac sprue. Using an indirect immunofluorescent method, we evaluated the kinetics of the antibody titers both during a gluten-free diet and after gluten was added, comparing them with the intestinal histological pattern. The IgA-EmA titers were evaluated on sera from 91 untreated adults with biopsy-proven celiac sprue and, when positive, were reappraised after different durations of gluten-free diet. Antibody titers were also retested in eight adolescents who had voluntarily discontinued the diet while they were on a free diet. The IgA-EmAs were detectable in 85 of 91 (93.40%) patients but in none of the 438 controls (100% specificity). The antibody titers ranged from 1:5 to 1:2,000 or more and the intestinal histopathological pattern paralleled the antibody titers. After gluten withdrawal, IgA-EmA titers declined to zero in all patients complying with their diet. Modifications in gut histopathologic condition paralleled IgA-EmA kinetics, although seroconversion to negativity preceded mucosal recovery. After a gluten rechallenge, deterioration in gut histopathologic condition followed EmA reversion to positivity. Three negative IgA-EmA tests did not reflect a worsening in gut histopathologic condition after a gluten-containing diet, thus making the diagnosis of celiac sprue uncertain.
authors.affiliation: Dipartimento di Fisiopatologia Clinica, Università, di Torino, Turin, Italy.
authors.forename: C
authors.initials: C
authors.lastname: Sategna-Guidetti
authors.forename: R
authors.initials: R
authors.lastname: Pulitanó
authors.forename: S
authors.initials: S
authors.lastname: Grosso
authors.forename: G
authors.initials: G
authors.lastname: Ferfoglia
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D001323:Autoantibodies / Q000097:blood*; D015415:Biomarkers / Q000097:blood; D002446:Celiac Disease / Q000178:diet therapy* / Q000276:immunology* / Q000473:pathology; D004044:Dietary Proteins / Q000008:administration & dosage; D005260:Female; D005983:Glutens / Q000008:administration & dosage; D006801:Humans; D007070:Immunoglobulin A / Q000097:blood*; D007421:Intestine, Small / Q000473:pathology; D008297:Male; D008875:Middle Aged; D009130:Muscle, Smooth / Q000276:immunology*; D010349:Patient Compliance; D011237:Predictive Value of Tests; D012680:Sensitivity and Specificity
chemical_list: D001323:Autoantibodies; D015415:Biomarkers; D004044:Dietary Proteins; D007070:Immunoglobulin A; D005983:Glutens