Immunoblot Analysis of Humoral Immune Response to Helicobacter pylori in Children with and without Duodenal Ulcer
| Autor: | Anfrisina S. T. Carvalho, Dulciene M.M. Queiroz, Andreia M. R. Oliveira, Ana Margarida M. F. Nogueira, Gifone A. Rocha |
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| Rok vydání: | 2000 |
| Předmět: |
Male
Microbiology (medical) Adolescent Spirillaceae Rapid urease test Enzyme-Linked Immunosorbent Assay Sensitivity and Specificity Helicobacter Infections Serology Bacterial Proteins Antigen Humans CagA Child Antigens Bacterial Helicobacter pylori Virulence biology Reproducibility of Results Bacteriology bacterial infections and mycoses biology.organism_classification Antibodies Bacterial Child Preschool Duodenal Ulcer Antibody Formation Immunology Humoral immunity biology.protein Female Antibody |
| Zdroj: | Journal of Clinical Microbiology. 38:1777-1781 |
| ISSN: | 1098-660X 0095-1137 |
| Popis: | Several studies have demonstrated that enzyme-linked immunosorbent assay is not a sensitive and specific method to diagnose Helicobacter pylori infection in children, especially in the younger ones. Since serum immune response can also be determined by immunoblotting and it permits the detection of antibodies to virulence factors such as CagA and VacA, we evaluated the accuracy of a commercial immunoblotting test to diagnose H. pylori infection and to assess the humoral immune response to different H. pylori antigens in 122 children who underwent upper gastrointestinal endoscopy. The presence of H. pylori was determined in antral biopsy specimens by culture, preformed urease test, and histological analysis. H. pylori was identified by microbiological and histopathological methods in 66 children (including all of the 21 who had duodenal ulcer). Antibodies to H. pylori were detected in 63 infected children and in 8 noninfected ones. The sensitivity, specificity, and positive and negative predictive values of the immunoblotting test were 95.5, 85.7, 88.7, and 94.1%, respectively. The number of immunoreactive bands increased with age ( P = 0.003), and the bands of 35 kDa ( P = 0.013); 89 kDa, the VacA antigen ( P = 0.001); and 116 kDa, the CagA antigen ( P = 0.00004) were more frequently observed in older children. The frequency of the bands of 89 kDa ( P = 0.001) and 116 kDa ( P = 0.03) was higher in children with duodenal ulcer than in H. pylori -positive children without the disease. In conclusion, the immunoblotting test appears to be useful for the diagnosis of H. pylori infection in children, even in the younger ones. |
| Databáze: | OpenAIRE |
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