Helicobacter pylori and CagA under conditions of iron deficiency.
Iron deficiency is the most common nutritional deficiency worldwide and compelling evidence has demonstrated that this condition heightens the risk of gastric cancer. Infection with Helicobacter pylori is the strongest known risk factor for the development of gastric adenocarcinoma. Recent work has demonstrated that, under conditions of iron deficiency, H. pylori-induced gastric carcinogenesis is augmented through increased formation of the strain-specific cag type IV secretion system and enhanced delivery of the bacterial oncoprotein CagA into host cells. Although CagA is a potent virulence factor that promotes oncogenic responses, additional studies have now demonstrated that CagA modulates host cell iron homeostasis in vitro and fundamental metabolic functions of the bacterial cell in vivo. Here we discuss these findings and describe working models by which CagA exerts its effects on gastric epithelial cells, with particular emphasis on its potential role in modulation of host iron homeostasis.
['Noto|Jennifer M|JM|', 'Peek|Richard M|RM|']
D000942:Antigens, Bacterial D001426:Bacterial Proteins D004847:Epithelial Cells D016480:Helicobacter pylori D006801:Humans D007501:Iron D000090463:Iron Deficiencies D013274:Stomach Neoplasms
Helicobacter pylori CagA iron deficiency cag type IV secretion system, gastric cancer