Browsing by Author "Toledo, Hector"
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- ItemDiferencias en la colonización oral por Streptococcus del grupo mutans en niños y adolescentes con síndrome de Down, con retraso mental y controles(2008) Linossier, Alfredo G.; Valenzuela, C. Y.; Toledo, Hector
- ItemDifferences of the oral colonization by Streptococcus of the mutans group in children and adolescents with Down syndrome, mental retardation and normal controls(2008) Linossier, Alfredo G.; Valenzuela, Carlos Y.; Toledo, Hector
- ItemHelicobacter pylori Displays Differential Iron Regulated Gene Expression Depending on Iron Status of Their Host(2012) Serrano Honeyman, Carolina Andrea; Villagran Torres, Andrea Alejandra; Cofre Dougnac, Colomba Del Carmen; Álvarez Espinoza, Manuel Alejandro; Venegas, Alejandro; Toledo, Hector; Harris Diez, Paul Richard
- ItemHelicobacter pylori-Induced Loss of the Inhibitor-of-Apoptosis Protein Survivin Is Linked to Gastritis and Death of Human Gastric Cells(OXFORD UNIV PRESS INC, 2010) Valenzuela, Manuel; Perez Perez, Guillermo; Corvalan, Alejandro H.; Carrasco, Gonzalo; Urra, Hery; Bravo, Denisse; Toledo, Hector; Quest, Andrew F. G.Helicobacter pylori infects the human stomach and modifies signaling pathways that affect gastric epithelial cell proliferation and viability. Chronic exposure to this pathogen contributes to the onset of gastric atrophy, an early event in the genesis of gastric cancer associated with H. pylori infection. Susceptibility to H. pylori-induced cell death ultimately depends on the presence of protective host cell factors. Although expression of the inhibitor-of-apoptosis protein survivin in adults is frequently linked to the development of cancer, evidence indicating that the protein is present in normal gastric mucosa is also available. Thus, we investigated in human gastric tissue samples and cell lines whether H. pylori infection is linked to loss of survivin and increased cell death. Our results show that infection with H. pylori decreased survivin protein levels in the mucosa of patients with gastritis. Furthermore, survivin down-regulation correlated with apoptosis and loss of cell viability in gastrointestinal cells cocultured with different H. pylori strains. Finally, overexpression of survivin in human gastric cells was sufficient to reduce cell death after infection. Taken together, these findings implicate survivin as an important survival factor in the gastric mucosa of humans.
- ItemInterleukin-1 beta and Tumor Necrosis Factor-alpha Polymorphisms as Iron Deficiency Risk Markers in Helicobacter pylori-Infected Children(2012) Serrano Honeyman, Carolina Andrea; Villagrán Torres, Andrea Alejandra; Venegas, Alejandro; Toledo, Hector; Crabtree, Jean E.; Harris Diez, Paul Richard