FOXP3+ regulatory T cells in children with helicobacter pylori infection.
Pediatr Dev Pathol
; 15(2): 118-26, 2012.
Article
em En
| MEDLINE
| ID: mdl-22260624
ABSTRACT
Despite an intensive pro-inflammatory response, the immune system is unable to clear the organism in Helicobacter pylori gastritis. Regulatory T (Treg) cells, which suppress the immune response of antigen-specific T cells, have recently been demonstrated to play a key role in chronic inflammation by immunologic tolerance. The purpose of our study was to investigate the histopathology, FOXP3+CD4+CD25(high)Treg (FOXP3+Treg) cell expression, and immune responses in children with H. pylori infection. Twenty-four H. pylori -positive and 24 H. pylori -negative children who underwent esophagogastroduodenoscopy for dyspeptic symptoms were included. Histopathologic grading according to the updated Sydney classification and immunohistochemical stains for FOXP3, transforming growth factor-ß1 (TGF-ß1), and CD4 were performed. Histopathologic bacterial density score, gastritis activity score, and chronic inflammation score were higher in the H. pylori -positive group than in the negative group (P < 0.01). The number of FOXP3+Treg cells and CD4+T cells and the grade of TGF-ß1 expression were significantly increased in the H. pylori -positive group compared to the negative group (P < 0.01). The number of FOXP3+Treg cells correlated positively with the grade of TGF-ß1 expression regardless of H. pylori status (P < 0.05). The number of FOXP3+Treg cells and the grade of TGF-ß1 expression correlated positively with H. pylori density, gastritis activity score, and chronic inflammation score regardless of H. pylori status (P < 0.01). These findings indicate that FOXP3+Treg cells could play a role in persistent H. pylori infection.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Subpopulações de Linfócitos T
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Infecções por Helicobacter
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Linfócitos T Reguladores
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Fatores de Transcrição Forkhead
Tipo de estudo:
Observational_studies
Limite:
Adolescent
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Child
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Child, preschool
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Female
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Humans
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Male
Idioma:
En
Revista:
Pediatr Dev Pathol
Assunto da revista:
PATOLOGIA
/
PEDIATRIA
Ano de publicação:
2012
Tipo de documento:
Article