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[Helicobacter pylori CagA antigen antibodies]
J Havlasová1, J Bures, S Rejchrt
1Oddĕlení klinické imunologie a alergologie FN, Hradec Králové.
Casopis Lekaru Ceskych
|September 28, 1998
Summary
Serologic response to Helicobacter pylori CagA antigen is more common in patients with peptic ulcer disease. This CagA antibody test may help identify individuals at higher risk for severe H. pylori infection.
Area of Science:
- Gastroenterology
- Immunology
- Infectious Diseases
Background:
- Helicobacter pylori (H. pylori) infection is linked to peptic ulcer disease and gastric cancer.
- The CagA antigen of H. pylori is highly immunogenic and its presence is associated with severe disease outcomes.
Purpose of the Study:
- To evaluate CagA seropositivity in symptomatic adults undergoing gastroduodenoscopy.
- To correlate CagA antibody levels with specific gastrointestinal disease characteristics.
Main Methods:
- Serum samples from 95 adults were tested for immunoglobulin G (IgG) antibodies against H. pylori CagA using ELISA.
- Results were compared to standard H. pylori IgG antibody tests and patient disease status (peptic ulcer disease, duodenitis, gastric resection).
Main Results:
- CagA IgG antibodies were detected in 73-85% of H. pylori positive patients with current or past peptic ulcer disease.
- In contrast, only 36% of H. pylori positive patients without peptic ulcer disease showed CagA antibodies.
- Antibody levels to CagA were significantly higher in patients with peptic ulceration (P < 0.05).
Conclusions:
- Serologic response to CagA is more prevalent in H. pylori positive individuals with peptic ulceration.
- Detecting CagA antibodies could aid in identifying patients with higher risk or more severe H. pylori-related gastrointestinal disease.