Monitoring of anti-transglutaminase autoantibodies in pediatric celiac disease using a sensitive radiobinding assay.

Abstract:

OBJECTIVES:The diagnosis of celiac disease (CD) is based on the histological identification of gluten-sensitive enteropathy and detection of anti-tissue transglutaminase antibodies (tTGA) and/or endomysial antibodies. Serial measurements of tTGA are now recommended as a follow-up strategy to monitor compliance with a gluten-free diet (GFD). We evaluated the performances of a quantitative radiobinding assay (RBA) of tTGA immunoglobulin A at diagnosis and during monitoring of GFD in pediatric CD. METHODS:Eighty children with confirmed CD were selected. Levels of serum tTGA measured by RBA and a commercial enzyme-linked immunosorbent assay (ELISA) were compared at diagnosis. The relation between RBA-tTGA levels and histological damage was analyzed, as well as the time course of tTGA clearance during GFD. RESULTS:Both RBA and ELISA showed high sensitivity and specificity for tTGA detection at diagnosis. There was no relation between RBA-tTGA levels at diagnosis and severity of mucosal damage. Upon initiation of GFD, the rate of RBA-tTGA positivity declined slower than that of endomysial antibodies positivity, with >50% of the children still tTGA positive at year 5; however, tTGA levels decreased rapidly during the first year of GFD and more slowly thereafter. Children who seroreverted had lower tTGA levels at diagnosis (2080±1554 cpm) than those who remained tTGA positive throughout follow-up (3688±1435 cpm). CONCLUSIONS:The high sensitivity of RBA is likely responsible for higher tTGA positivity rates during GFD than previously reported with ELISA. A decreasing trend for tTGA levels may represent a better surrogate marker of compliance with GFD than absolute normal tTGA levels.

authors

Candon S,Mauvais FX,Garnier-Lengliné H,Chatenoud L,Schmitz J

doi

10.1097/MPG.0b013e318232c459

subject

Has Abstract

pub_date

2012-03-01 00:00:00

pages

392-6

issue

3

eissn

0277-2116

issn

1536-4801

journal_volume

54

pub_type

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