Differential pro-tumorigenic effects of Helicobacter pylori and Streptococcus anginosus on AGS cells: contact-dependent versus metabolite-driven mechanisms.

Streptococcus anginosus promotes gastric cancer through its metabolites, exerting stronger pro-tumorigenic effects than Helicobacter pylori's contact-dependent mechanisms.

• Why it matters: Understanding the distinct roles of different gastric bacteria is crucial for developing targeted therapies and improving gastric cancer prevention strategies, as their interactions and pathogenic mechanisms are not well characterized.
• What they did: The study analyzed public databases, clinical samples, and in vitro AGS cell models, quantifying bacteria and assessing their effects, revealing that H. pylori and S. anginosus operate via separate colonization and pathogenic pathways.
• The result: Findings show S. anginosus metabolites significantly enhance tumor-related gene expression and cell proliferation, highlighting bacterial metabolites as key contributors to gastric carcinogenesis and potential therapeutic targets.