Related Experiment Videos
Chronic Chlamydia pneumoniae infection is associated with a serum lipid profile known to be a risk factor for
Insights
Chronic Chlamydia pneumoniae infection is linked to higher triglyceride and total cholesterol levels. This infection also shows decreased HDL cholesterol, suggesting a higher risk for atherosclerosis.
Area of Science:
- Infectious Diseases
- Cardiovascular Medicine
- Biochemistry
Background:
- Chlamydia pneumoniae infection is a suspected contributor to coronary heart disease.
- The impact of chronic infection on lipid profiles requires further investigation.
Purpose of the Study:
- To investigate the association between chronic Chlamydia pneumoniae infection and serum lipid levels.
- To determine if chronic infection influences lipid profiles similarly to acute infections.
Main Methods:
- Paired serum samples from 415 Finnish males, collected 3 years apart, were analyzed.
- Chlamydia pneumoniae specific IgG and IgA antibodies were measured to define chronic infection.
- Serum triglyceride, total cholesterol, and HDL cholesterol concentrations were quantified.
Main Results:
- Chronic C. pneumoniae infection (persistent IgG and IgA antibodies) was identified in 20% of subjects.
- Subjects with chronic infection exhibited higher triglyceride and total cholesterol levels compared to antibody-negative individuals.
- Significantly decreased HDL cholesterol concentrations and HDL/total cholesterol ratios were observed in those with chronic infection.
Conclusions:
- Chronic Chlamydia pneumoniae infection is associated with an atherogenic lipid profile.
- These findings support the role of infections in the pathogenesis of atherosclerosis.
Abstract:
Chlamydia pneumoniae infection has been associated with coronary heart disease. To evaluate the mechanisms of this association, we studied whether chronic C. pneumoniae infection affects serum lipid values similarly to acute infections. Triglyceride, total and HDL cholesterol concentrations, and C. pneumoniae antibodies were measured from paired serum samples of 415 Finnish males taken 3 years apart. Chronic infection, defined as persistent IgG and IgA antibodies, was found in 20%, and the antibodies were negative (IgG < 32 and IgA < 16 in both samples) in 15% of the cases studied. The serum triglyceride and total cholesterol concentrations were higher in the subjects with a chronic C. pneumoniae infection than in the subjects with no antibodies (1.23 versus 1.03 mmol/L and 6.41 versus 6.31 mmol/L, respectively). The HDL cholesterol concentrations and the ratios of HDL cholesterol to total cholesterol were significantly decreased in the subjects with chronic infection (1.24 versus 1.36 mmol/L, P = .026; and 0.19 versus 0.22, P = .018, respectively). Chronic C. pneumoniae infection seems to be associated with a serum lipid profile considered to increase the risk of atherosclerosis. This finding supports the hypothesis that infections play a role in the pathogenesis of atherosclerosis.