Functional study of gene hp0169 in Helicobacter pylori pathogenesis

Area of Science:

• Microbiology
• Molecular Biology
• Pathogenesis

Background:

• Helicobacter pylori pathogenesis involves multiple virulence genes with unclear mechanisms.
• Understanding these mechanisms is crucial for developing effective treatments.

Purpose of the Study:

• To investigate the role of gene hp0169, encoding putative collagenase HpPrtC, in H. pylori pathogenesis.
• To elucidate the specific functions of HpPrtC in bacterium-host interactions.

Main Methods:

• Recombinant HpPrtC activity assay on collagens.
• Deletion of hp0169 via homologous recombination in H. pylori.
• Assessment of host cell (GES-1) apoptosis, viability, and proliferation after infection with wild-type and mutant strains.

Main Results:

• Recombinant HpPrtC demonstrated collagenolytic activity against native and heat-denatured collagens, suggesting a role in colonization.
• The hp0169 mutant did not significantly alter GES-1 cell apoptosis induction.
• GES-1 cells infected with the hp0169 mutant showed higher viability and proliferation rates compared to wild-type infection.

Conclusions:

• HpPrtC functions as a virulence factor in H. pylori by degrading collagens, facilitating gastric colonization.
• HpPrtC participates in H. pylori pathogenesis through collagen degradation and an additional, yet uncharacterized, pathway affecting host cell viability and proliferation.