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Chlamydia pneumoniae and vascular disease
R G Gibbs1, N Carey, A H Davies
1Department of Surgery, Imperial College School of Medicine, Charing Cross Hospital, London, UK.
Insights
The human pathogen Chlamydia pneumoniae is linked to atherosclerosis. Evidence suggests this bacterium infects vascular cells, potentially contributing to cardiovascular disease, warranting further antibiotic trials.
Area of Science:
- Cardiovascular Research
- Infectious Diseases
- Pathogen Biology
Background:
- Growing evidence links the pathogen Chlamydia pneumoniae to atherosclerosis.
- The role of infectious agents in chronic diseases is a significant area of research.
Purpose of the Study:
- To review the literature on the association between Chlamydia pneumoniae and atherosclerosis.
- To evaluate the evidence for C. pneumoniae's role in the development and progression of atherosclerotic disease.
Main Methods:
- A comprehensive Medline-based literature review was conducted.
- Analysis included seroepidemiological studies, human tissue investigations, animal models, in vitro experiments, and clinical trials.
Main Results:
- Seroepidemiological data suggest a correlation between C. pneumoniae infection and atherosclerotic disease.
- Direct and indirect detection methods confirm C. pneumoniae presence in human atherosclerotic tissue more frequently than in controls.
- Animal models demonstrate C. pneumoniae's ability to disseminate and target atherosclerotic lesions.
- In vitro studies show C. pneumoniae infects vascular cells, multiplies, and triggers inflammatory cytokine responses.
- Clinical trials indicate macrolide antibiotics may offer cardiovascular protection post-myocardial infarction.
Conclusions:
- Chlamydia pneumoniae is strongly implicated in the pathogenesis of atherosclerosis.
- The bacterium's ability to infect vascular cells and induce inflammation supports its role in cardiovascular disease.
- Further large-scale clinical trials are necessary to determine the therapeutic efficacy of antibiotics in peripheral arterial disease.
Background:
There is an increasing body of evidence linking the human pathogen Chlamydia pneumoniae with atherosclerosis.
Methods:
A Medline-based review of the literature was carried out.
Results And Conclusion:
Seroepidemiological studies have revealed the possibility that evidence of infection with C. pneumoniae and atherosclerotic disease are related. Studies on human tissue have demonstrated that evidence of the organism can be found in human atherosclerotic tissue by both direct and indirect methods significantly more often than in control vascular tissue. Using animal models it is possible to show that C. pneumoniae can be disseminated haematogenously following pulmonary infection and that it shows a tropism for atherosclerotic tissue. In vitro work has demonstrated that the organism is capable of infecting, surviving and multiplying in cells of the human vascular wall, and that it can provoke a cell-mediated cytokine response which has implications both locally and systemically. Two clinical trials of macrolide antibiotics have demonstrated that they confer increased cardiovascular protection in patients following myocardial infarction. Adequately powered trials are needed to establish the therapeutic role of antibiotics in peripheral arterial disease.