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Published on: May 6, 2014
HSP60, SP110 and TNF-α expression in Chlamydia pneumoniae-positive versus Chlamydia pneumoniae-negative
Nemanja Radojevic1,2, Batric Vukcevic1,2, Andrea Jovovic
1Clinical Centre of Montenegro, Montenegro.
Insights
Chlamydia pneumoniae infection is linked to atherosclerosis development, with higher HSP60 and lower Sp110 markers. This suggests bacterial involvement in cardiovascular disease progression.
Area of Science:
- Cardiovascular Science
- Infectious Disease Immunology
- Pathogen-Host Interactions
Background:
- Atherosclerosis pathogenesis remains incompletely understood, with traditional risk factors absent in 50% of ischemic heart disease patients.
- Chronic, low-grade inflammation, potentially triggered by infectious agents like Chlamydia pneumoniae, is implicated in atherosclerosis.
- Understanding the role of specific pathogens and host response markers is crucial for developing effective interventions.
Purpose of the Study:
- To investigate the association between Chlamydia pneumoniae infection and specific molecular markers (Sp110, HSP60, TNF-α) in arterial tissues.
- To explore the relationship between Chlamydia pneumoniae positivity and traditional cardiovascular risk factors.
- To elucidate the role of Chlamydia pneumoniae in atherogenesis and its impact on inflammatory markers.
Main Methods:
- Immunohistochemical analysis of arterial samples from Chlamydia pneumoniae-positive (n=33) and negative (n=30) individuals.
- Quantification of protective Sp110, atherogenic HSP60, and inflammatory TNF-α markers.
- Statistical correlation analysis between Chlamydia pneumoniae status, risk factors, and marker expression.
Main Results:
- Chlamydia pneumoniae-negative subjects were older with lower BMI. Age, hypercholesterolemia, diabetes, hypertension, and BMI were negatively correlated with Chlamydia pneumoniae-positivity.
- Significantly higher Sp110 presence in Chlamydia pneumoniae-negative group vs. higher HSP60 in Chlamydia pneumoniae-positive group.
- Elevated TNF-α expression in Chlamydia pneumoniae-negative plaques across most arteries, suggesting a complex inflammatory response.
Conclusions:
- Chlamydia pneumoniae infection is associated with specific atherogenic (HSP60) and protective (Sp110) marker profiles in arterial tissues.
- The findings suggest a potential role for Chlamydia pneumoniae in modulating host inflammatory responses and contributing to atherosclerosis.
- This study provides a model for understanding bacterial-induced atherogenesis and evaluating targeted intervention strategies.
Abstract:
Traditionally recognized risk factors for atherosclerosis are not presented in 50% of patients with ischemic heart disease. Chronic inflammation with low pathogenic agents with slightly, or no signs of inflammation is the mainstay of atherosclerosis and could be triggered by an infectious agent, most commonly by Chlamydia pneumoniae. Immunostaning of 33 Chlamydia pneumoniae-positive and 30 Chlamydia pneumoniae- negative quadriple arterial sets were examined for protective Sp110, and atherogenic HSP60 markers, as well as for TNF-α which is inflammatory marker affected by both of them. The Chlamydia pneumoniae-negative deceased subjects were statistically significantly older and their BMI was significantly lower. The results showed that age, hypercholesterolemia, diabetes, arterial hypertension and BMI were negatively correlated with Chlamydia pneumoniae-positivity, while no significant relationship was found between Chlamydia pneumoniae-positivity and a positive family history of cardiovascular diseases, as well as smoking. Significantly higher presence of Sp110 in Chlamydia pneumoniae-negative group versus significantly higer presence od HSP60 in Chlamydia pneumoniae-positive group. Chlamydia pneumoniae-negative plaques showed higher TNF-α expression; difference is present for all arteries examined except the Willis circle. This study may provide a model for further understanding the mechanisms of Chlamydia pneumoniae atherogenesis and evaluating chlamydial intervention strategies for preventing the advancement of atherosclerotic lesions enhanced by bacterial infections.
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