Detection of Helicobacter-like DNA in the gastric mucosa of Thoroughbred horses.

This study investigates the presence of Helicobacter-like DNA in the stomach lining of Thoroughbred horses and suggests a possible new area of disease research, as such bacteria may have the potential to cause gastric issues in these animals.

Objective of the Research

• The aim of this study was to evaluate the presence of Helicobacter DNA in the gastric mucosa (stomach lining) of Thoroughbred horses. Helicobacter is a genus of bacteria that is commonly associated with various gastrointestinal diseases in humans, including gastritis and gastric ulcers.

Methodology

• For this study, squamous and glandular mucosa samples were collected from 20 Thoroughbred horses. None of these horses had displayed any prior clinical symptoms of gastrointestinal disease.
• The researchers utilized histopathological techniques (study of changes in tissues caused by disease) and a specific PCR assay (Polymerase Chain Reaction, a method widely used in molecular biology to make multiple copies of a specific DNA segment) to analyze these tissue samples.
• The PCR products were then sequenced to confirm whether the DNA belonged to the Helicobacter genus.

Findings

• The study diagnosed seven horses with gastric ulceration, five with gastritis and six with both pathologies, while only two horses had a healthy gastric lining.
• Helicobacter-like DNA was found in some horses with gastritis, gastric ulcers, those with both conditions, and even in one of the horses with a healthy stomach lining.
• The analysis of the sequenced amplicons revealed that the Helicobacter genus samples shared a high identity (99%) with the Helicobacter pylori 16S rRNA gene, a bacterium known for causing gastritis and gastric ulcers in humans.
• However, when samples were tested with H. pylori-specific PCR assays targeting cagA and glmM genes (known Helicobacter pylori genes), all the samples tested negative. This suggests that the bacteria detected may be different species within the Helicobacter genus, rather than H. pylori commonly associated with human diseases.

Conclusion and Future Implications

• These results led to the conclusion that the Helicobacter genus, or at least bacteria closely related, might affect the stomach lining of horses, a possibility that was earlier unreported.
• It marks the first report of Helicobacter-like DNA discovered in the gastric mucosa of horses and its pathogenic potential requires further investigation.
• The implications of these findings could be substantial for veterinary medicine and equine health, especially if future research proves that this bacterium plays a role in equine gastric diseases.