Protein A and protein G ELISA for the detection of IgG autoantibodies against tissue transglutaminase in childhood celiac disease.
Clin Chim Acta
; 395(1-2): 72-6, 2008 Sep.
Article
en En
| MEDLINE
| ID: mdl-18514068
ABSTRACT
OBJECTIVES:
To investigate if the detection of celiac disease (CD) in children was improved by using alternative conjugates for assessment of tissue transglutaminase (tTG) autoantibodies.METHODS:
Serum samples from 108 biopsy confirmed CD children and 42 control subjects were investigated for the presence of autoantibodies with tTG coated microplates using protein A (PA), protein G (PG), anti-IgG, or anti-IgA as conjugates.RESULTS:
Of the 108 CD children, 86 (80%) were IgG-tTG positive, 91 (84%) were positive with the PA-conjugate, 94 (87%) were positive with the PG-conjugate, and 103 (95%) were IgA-tTG positive. Among the 42 controls, 4 (10%) were IgG-tTG positive, 5 (12%) were positive with both the PA- and PG conjugates, whereas 3 (7%) were IgA-tTG positive. Compared with IgG-tTG the concordance was 93% for PA and 95% for PG, with a positive correlation between antibody levels (r=0.967 and r=0.975, p<0.0001). All but one CD child were found positive by combining IgG-tTG and IgA-tTG detection.CONCLUSIONS:
The sensitivity of IgG-tTG detection with ELISA increased by protein A or protein G conjugates, whereas the specificity was reduced as compared with anti-IgG conjugate. The combined measurement of IgA-tTG and IgG-tTG still seems to be the optimal procedure when screening children for CD.
Texto completo:
1
Bases de datos:
MEDLINE
Asunto principal:
Autoanticuerpos
/
Proteína Estafilocócica A
/
Inmunoglobulina G
/
Enfermedad Celíaca
/
Transglutaminasas
/
Proteínas de Unión al GTP
/
Proteínas del Tejido Nervioso
Tipo de estudio:
Diagnostic_studies
/
Observational_studies
Límite:
Adolescent
/
Adult
/
Child
/
Child, preschool
/
Female
/
Humans
/
Infant
/
Male
Idioma:
En
Revista:
Clin Chim Acta
Año:
2008
Tipo del documento:
Article
País de afiliación:
Suecia