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High Resolution Electron Microscopy of the Helicobacter pylori Cag Type IV Secretion System Pili Produced in Varying Conditions of Iron Availability
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Increased gastric IL-1β concentration and iron deficiency parameters in H. pylori infected children

Dulciene Maria Magalhaes Queiroz1, Andreia Maria Camargos Rocha, Fabricio Freire Melo

  • 1Laboratory of Research in Bacteriology, Faculdade de Medicina, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil. dqueiroz@medicina.ufmg.br

Plos One
|March 2, 2013
PubMed

Insights

Helicobacter pylori infection in children can lead to iron deficiency and anemia. Elevated gastric IL-1β levels, a marker of H. pylori infection, predict lower ferritin and hemoglobin, linking the infection to iron depletion.

Area of Science:

  • Pediatric Gastroenterology
  • Immunology
  • Hematology

Background:

  • The link between H. pylori infection and iron deficiency/anemia is known, but underlying mechanisms remain unclear.
  • Gastric acid secretion is crucial for iron absorption, and certain cytokines can inhibit it.
  • Interleukin-1 beta (IL-1β) and Tumor Necrosis Factor-alpha (TNF-α) are potent inhibitors of gastric acid secretion.

Purpose of the Study:

  • To investigate the role of gastric IL-1β and TNF-α in H. pylori-associated iron deficiency and anemia in children.
  • To determine if increased gastric cytokine concentrations predict low ferritin and hemoglobin levels.
  • To explore the influence of IL1 and TNFA gene polymorphisms on these associations.

Main Methods:

  • Endoscopic evaluation of 125 children with gastrointestinal symptoms.
  • Gastric specimen analysis for H. pylori status and cytokine levels (IL-1β, TNF-α).
  • Blood sample analysis for iron deficiency parameters (ferritin, hemoglobin) and cytokine gene polymorphisms (IL1 cluster, TNFA).

Main Results:

  • H. pylori-positive children exhibited higher gastric IL-1β and TNF-α concentrations compared to H. pylori-negative children.
  • Gastric IL-1β levels, but not TNF-α, significantly predicted lower ferritin and hemoglobin concentrations.
  • These findings were consistent in younger children, particularly those with IL1RN genotypes associated with higher IL-1β expression.

Conclusions:

  • Elevated gastric IL-1β concentrations serve as a key link between H. pylori infection and the development of iron deficiency and iron deficiency anemia in children.
  • Targeting IL-1β may offer a therapeutic strategy for preventing or treating iron depletion in H. pylori-infected children.

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