title: [Evaluation of selected immunocompetent cells expression in gastric mucosa in children with Helicobacter pylori infection before and after eradication treatment--a preliminary study].
abstract: BACKGROUND
  Helicobacter pylori infection activates local immunological response and causes mononuclear cells infiltration in the gastric mucosa. On this account the studies on lymphocyte subpopulations in the gastric mucosa in children during Helicobacter pylori infections are inconsistent. It has been shown that the morphological status of gastric mucosa in children with Helicobacter pylori infection is different than in adult patients. THE AIM OF THE STUDY was the evaluation of chosen immunocompetent cells expression in gastric mucosa in children before and after eradication treatment.
  
  
  METHODS
  Forty-nine children with chronic abdominal pain was enrolled in the study. They were divided into the following groups: 22 children without infection (negative urease test and absence of Helicobacter pylori antigen assessed by immunoenzymatic and immunofluorescent methods) and 27 with Helicobacter pylori infection. Part of the children (11) from the second group had a follow-up endoscopy after eradication therapy. The tissue samples from the gastric antrum and fundus were obtained for morphological and immunohistochemistry assays by direct immunofluorescent and immunoenzymatic methods.
  
  
  RESULTS
  There were negative Helicobacter pylori tests in group I. In the group of infected children superficial colonisation of pathogen dominated In analysed groups percentage of patients with superficial antigens and cytokines (CD3, CD4, CD8, CD20, IL-4, IL-6, INF-gamma) characteristic for each lymphocytes subpopulations were established. In infammatory infiltrations T lymphocytes CD4 and B lymphocytes CD20 dominated localised mainly in the lamina propria of the gastric mucosa. Expression of above lymphocytes subpopulations diminished after eradication treatment. After treatment the total eradication of Helicobacter pylori was observed in 5 children and in 6 patients the pathogen persisted.
  
  
  CONCLUSIONS
  The dominant role in local response during Helicobacter pylori infection in children is played by T CD4 and B CD20 lymphocytes localised mainly in lamina propria of gastric mucosa. Degree of T cells CD4 and CD20 expression decreases after eradication treatment.
authors.affiliation: Katedra i Klinika Pediatrii, Gastroenterologii i Onkologii Dzieciecej Akademii Medycznej w Gdańsku. akmiec@amg.gda.pl
authors.forename: Aldona
authors.initials: A
authors.lastname: Kotłowska-Kmieć
authors.forename: Maria
authors.initials: M
authors.lastname: Korzon
authors.forename: Grazyna
authors.initials: G
authors.lastname: Łuczak
authors.forename: Alicja
authors.initials: A
authors.lastname: Bakowska
authors.forename: Ewa
authors.initials: E
authors.lastname: Kozielska
authors.forename: Anna
authors.initials: A
authors.lastname: Galińska
authors.forename: Anna
authors.initials: A
authors.lastname: Borkowska
authors.forename: Katarzyna
authors.initials: K
authors.lastname: Plata-Nazar
authors.forename: Joanna
authors.initials: J
authors.lastname: Furtak
authors.forename: Marta
authors.initials: M
authors.lastname: Bogotko-Szarszewska
mesh_terms: D000293:Adolescent; D018951:Antigens, CD20 / Q000096:biosynthesis; D016175:B-Lymphocyte Subsets / Q000276:immunology; D017252:CD3 Complex / Q000096:biosynthesis; D015704:CD4 Antigens / Q000096:biosynthesis; D015496:CD4-Positive T-Lymphocytes / Q000187:drug effects / Q000276:immunology*; D016827:CD8 Antigens / Q000096:biosynthesis; D018414:CD8-Positive T-Lymphocytes / Q000187:drug effects / Q000276:immunology*; D016022:Case-Control Studies; D002648:Child; D005260:Female; D005753:Gastric Mucosa / Q000276:immunology* / Q000378:metabolism; D015870:Gene Expression; D016481:Helicobacter Infections / Q000188:drug therapy / Q000276:immunology*; D016480:Helicobacter pylori / Q000302:isolation & purification*; D006801:Humans; D007371:Interferon-gamma / Q000096:biosynthesis; D015847:Interleukin-4 / Q000096:biosynthesis; D015850:Interleukin-6 / Q000096:biosynthesis; D008297:Male; D016176:T-Lymphocyte Subsets / Q000276:immunology
chemical_list: D018951:Antigens, CD20; D017252:CD3 Complex; D015704:CD4 Antigens; D016827:CD8 Antigens; C508598:IL4 protein, human; C508600:IL6 protein, human; D015850:Interleukin-6; D015847:Interleukin-4; D007371:Interferon-gamma