Chlamydia pneumoniae-Mediated Inflammation in Atherosclerosis: A Meta-Analysis

Area of Science:

• Cardiovascular Medicine
• Infectious Diseases
• Inflammation Research

Background:

• Conflicting evidence exists regarding the link between Chlamydia pneumoniae (C. pneumoniae) infection and atherosclerotic cardiovascular diseases (ASCVD).
• The role of C. pneumoniae in exacerbating inflammation associated with atherosclerosis requires further clarification.

Purpose of the Study:

• To conduct a meta-analysis investigating the association between C. pneumoniae infection and the inflammatory pathogenesis of atherosclerosis.
• To determine if C. pneumoniae infection contributes to increased inflammation in patients with atherosclerosis.

Main Methods:

• Meta-analysis of 12 case-control, 6 cross-sectional, and 7 prospective studies, totaling 10,176 patients.
• Assessed C. pneumoniae seroprevalence using Odds Ratios (OR) and inflammatory marker differences using standard mean differences.
• Evaluated publication bias to ensure statistical robustness.

Main Results:

• Significant increases in high-sensitivity C-reactive protein (hsCRP), fibrinogen, interleukin-6 (IL-6), TNF-α, and IFN-γ were observed in atherosclerosis patients versus controls.
• A higher seroprevalence of C. pneumoniae was found in atherosclerosis patients (OR: 3.11, 95% CI: 2.88-3.36).
• Atherosclerotic patients seropositive for C. pneumoniae IgA exhibited significantly higher levels of hsCRP, IL-6, and fibrinogen compared to seronegative patients.

Conclusions:

• C. pneumoniae infection appears to contribute to atherosclerotic cardiovascular diseases by promoting an inflammatory state.
• C. pneumoniae IgA seropositivity, alongside elevated hsCRP, fibrinogen, and IL-6, may serve as predictive indicators for atherosclerotic cardiovascular risk.