The hypothesis that Helicobacter pylori predisposes to Alzheimer's disease is biologically plausible

Area of Science:

• Molecular Biology
• Neuroscience
• Microbiology

Background:

• Epidemiological studies suggest a correlation between Helicobacter pylori (H. pylori) infection and an increased risk of developing Alzheimer's disease.
• The specific cellular and molecular mechanisms underlying this potential link remain largely unexplored.

Purpose of the Study:

• To investigate the cellular response to H. pylori peptide Hp(2-20) exposure in human gastric cells.
• To identify genes and pathways modulated by Hp(2-20) that may bridge H. pylori infection and Alzheimer's disease pathology.

Main Methods:

• Incubation of human gastric MNK-28 cells with the H. pylori peptide Hp(2-20).
• Global gene expression analysis to monitor changes in gene activation.
• Bioinformatic analysis to identify modulated genes and associated pathways, including cross-referencing with the AlzBase database.

Main Results:

• Hp(2-20) modulated 77 genes in MNK-28 cells.
• A significant proportion (65 genes) of modulated genes are listed in the AlzBase database, including key Alzheimer's disease genes: APP, APOE, PSEN1, and PSEN2.
• Thirty of the 77 modulated genes were associated with the inflammation pathway, indicating a strong inflammatory response.

Conclusions:

• The H. pylori peptide Hp(2-20) significantly impacts gene expression in human gastric cells, affecting genes central to Alzheimer's disease.
• The observed dysregulation of pathways, including inflammation, mirrors those seen in Alzheimer's and Leasch-Nyhan diseases.
• These findings propose a novel, albeit preliminary, cellular link between H. pylori infection and the pathogenesis of neurological disorders like Alzheimer's disease, warranting further investigation.