Protease-activated receptor-1 down-regulates the murine inflammatory and humoral response to Helicobacter pylori
- 1Centre for Animal Biotechnology, School of Veterinary Science, University of Melbourne, Melbourne, Australia.
- 0Centre for Animal Biotechnology, School of Veterinary Science, University of Melbourne, Melbourne, Australia.
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View abstract on PubMed
Summary
This summary is machine-generated.Protease-activated receptor-1 (PAR-1) protects against severe Helicobacter pylori-induced gastritis by suppressing the inflammatory cytokine MIP-2. PAR-1 deficiency exacerbates H. pylori colonization and inflammation.
Area Of Science
- Gastroenterology
- Immunology
- Microbiology
Background
- Helicobacter pylori infection causes diverse gastric pathologies, influenced by host factors.
- Protease-activated receptors (PARs) sense tissue damage and pathogens.
- The roles of PAR-1 and PAR-2 in H. pylori pathogenesis were previously unexamined.
Purpose Of The Study
- To investigate the role of PAR-1 and PAR-2 in regulating the host response to H. pylori infection.
- To determine how PAR-1 and PAR-2 influence H. pylori colonization and gastritis severity.
Main Methods
- PAR-1(-/-), PAR-2(-/-), and wild-type mice were infected with H. pylori.
- Colonization, gastritis severity, and serum antibody levels were assessed.
- Epithelial cell activation, NF-kappaB, and cytokine secretion were analyzed.
Main Results
- H. pylori levels were reduced in PAR-1(-/-) and increased in PAR-2(-/-) mice, inversely correlating with inflammation.
- PAR-1 deficiency led to increased serum antibody responses and elevated NF-kappaB and MIP-2 in epithelial cells.
- PAR-1 down-regulated MIP-2 secretion in response to H. pylori cag pathogenicity island activity.
Conclusions
- PAR-1 plays a protective role against severe H. pylori-induced gastritis.
- This protection may involve suppressing the production of proinflammatory cytokines like MIP-2.
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