A sensitive and specific PCR method to detect Helicobacter felis in a conventional mouse model

Area of Science:

• Microbiology
• Molecular Biology
• Animal Models

Background:

• Limited sensitivity and specificity of current detection methods for Helicobacter colonization in small animal models.
• Need for improved Helicobacter felis mouse models for accurate therapeutic regimen evaluation.

Purpose of the Study:

• To develop a Polymerase Chain Reaction (PCR) for detecting and quantitatively measuring H. felis in viral antibody-free (VAF) mice.
• To establish a more sensitive and specific Helicobacter detection method for small animal models.

Main Methods:

• Developed a PCR assay targeting the H. felis 16S rRNA gene.
• Utilized competitive PCR with an internal control DNA for quantitative analysis.
• Infected VAF mice with H. felis and collected stomach mucosa for PCR analysis at various time points.
• Confirmed H. felis colonization through culture isolation and histological examination.

Main Results:

• The developed PCR method detected approximately 50 to 100 H. felis cells per mouse stomach.
• The PCR assay demonstrated no cross-reactivity with other common mouse stomach bacteria.
• Therapeutic response in the H. felis mouse model correlated well with human clinical trial results for H. pylori.

Conclusions:

• A novel PCR-based detection and quantification method for H. felis in mouse models has been successfully developed.
• This enhanced Helicobacter detection model offers improved accuracy for evaluating therapeutic regimens.
• The model is suitable for discovering new antibiotics and vaccines against Helicobacter ulcer disease.