Cytotoxin-associated gene-A-seropositivity and Interleukin-1 polymorphisms influence adverse cardiovascular events

Area of Science:

• Cardiovascular Medicine
• Infectious Diseases
• Genetics

Background:

• The role of Helicobacter pylori (HP) infection and host genetic factors in acute coronary syndrome (ACS) remains unclear.
• Bacterial virulence factors like cytotoxin-associated gene-A (CagA) and host interleukin-1 (IL-1) polymorphisms are implicated in various diseases.

Purpose of the Study:

• To investigate the association between HP infection, CagA seropositivity, IL-1 polymorphisms, and clinical outcomes in ACS patients.
• To explore the potential mechanisms linking HP infection to adverse cardiovascular events.

Main Methods:

• A cohort of 341 consecutive ACS patients was followed for 2 years to assess composite cardiovascular events.
• Patients were stratified based on HP infection status, CagA seropositivity, and IL-1 polymorphisms.
• Immunohistochemical staining was used to detect CagA-positive cells in aortic tissues.

Main Results:

• HP-positive patients exhibited a significantly higher probability of adverse cardiovascular events compared to HP-negative patients.
• The association between HP infection and cardiovascular events was significant only in the presence of IL-1 polymorphisms.
• Cardiovascular event rates differed significantly among CagA-positive, CagA-negative/HP-positive, and CagA-negative/HP-negative groups.
• Aortic vasa vasorum in CagA-positive patients showed CagA-positive cells, absent in CagA-negative patients.

Conclusions:

• Bacterial virulence factor CagA and host IL-1 polymorphisms are associated with increased incidence of adverse cardiovascular events in ACS.
• These factors may influence cardiovascular outcomes through the infection of atherosclerotic lesions.
• The study provides evidence for a link between specific HP virulence factors, host genetics, and cardiovascular disease progression.