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Expression of Tumor Necrosis Factor–α–Related Apoptosis‐Inducing Ligand and Its Proapoptotic Receptors Is Down‐Regulated during Gastric Infection with VirulentcagA+/vacAs1+Helicobacter pyloriStrains
- Source :
- The Journal of Infectious Diseases. 191:571-578
- Publication Year :
- 2005
- Publisher :
- Oxford University Press (OUP), 2005.
-
Abstract
- Background. Infection of the gastric mucosa with Helicobacter pylori leads to increased apoptosis. Cytokines and receptors of the tumor necrosis factor (TNF) family are known to be involved in this process. The role that the death-inducing TNF-α-related apoptosis-inducing ligand (TRAIL) and its receptors play, in the context of H. pylori infection, is unknown. Methods. In 74 H. pylori-infected and 51 H. pylori-uninfected gastric antral biopsy specimens, levels of TRAIL mRNA and TRAIL receptor mRNA were determined quantitatively by TaqMan reverse-transcriptase polymerase chain reaction. Recombinant TRAIL-induced apoptosis was measured in human and rat gastric epithelial cells by end-labeling of DNA with fluorescein-dTUP and by fluorescence-activated cell sorter analysis. Results. In patients infected with cagA + /vacAs1 + H. pylori strains, expression of TRAIL and the proapoptotic receptors TRAIL-R1 and -R2 was down-regulated, whereas expression of the antiapoptotic receptors TRAIL-R3 and -R4 was up-regulated. Furthermore, expression of TRAIL and TRAIL-R1 and -R2 correlated inversely with the severity of gastric inflammation. Significant apoptosis of isolated human gastric epithelial cells and highly enriched rat parietal and chief cells was induced by 100 ng/mL TRAIL. Conclusions. Down-regulation of the TRAIL system, in the context of H. pylori infection, may limit exaggerated apoptosis of gastric epithelial cells and destruction of tissue and, therefore, may enable H. pylori to maintain its niche.
- Subjects :
- Adult
Male
Programmed cell death
Down-Regulation
Apoptosis
GPI-Linked Proteins
Receptors, Tumor Necrosis Factor
Helicobacter Infections
TNF-Related Apoptosis-Inducing Ligand
Bacterial Proteins
Parietal Cells, Gastric
Receptors, Tumor Necrosis Factor, Member 10c
Gastric mucosa
medicine
Animals
Humans
Immunology and Allergy
CagA
RNA, Messenger
Receptor
Cells, Cultured
Aged
Antigens, Bacterial
Chief Cells, Gastric
Gastric Infection
Membrane Glycoproteins
Helicobacter pylori
biology
Tumor Necrosis Factor-alpha
Epithelial Cells
DNA
Middle Aged
Flow Cytometry
biology.organism_classification
Rats
Gastric chief cell
Receptors, TNF-Related Apoptosis-Inducing Ligand
Tumor Necrosis Factor Decoy Receptors
Infectious Diseases
medicine.anatomical_structure
Gene Expression Regulation
Gastric Mucosa
Immunology
Cancer research
Female
Tumor necrosis factor alpha
Apoptosis Regulatory Proteins
Subjects
Details
- ISSN :
- 15376613 and 00221899
- Volume :
- 191
- Database :
- OpenAIRE
- Journal :
- The Journal of Infectious Diseases
- Accession number :
- edsair.doi.dedup.....2a5b573b5c1f4a706bbb5a617c8854a7