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Failure to demonstrate Chlamydia pneumoniae in symptomatic abdominal aortic aneurysms by a nested polymerase chain
J S Lindholt1, L Ostergård, E W Henneberg
1Department of Vascular Surgery, Viborg Hospital, Denmark.
Objective:
To investigate whether Chlamydia pneumoniae is present in symptomatic abdominal aortic aneurysms (AAA).
Method And Materials:
After optimisation of DNA extraction procedures an inhibitor-controlled nested polymerase chain reaction (PCR) amplifying fragments of the gene encoding the C. pneumoniae specific major outer membrane protein was performed on 124 wall-specimens from 20 patients with symptomatic AAA.
Results:
None of the specimens contained C. pneumoniae-specific DNA. Minor inhibition of the PCR was noticed especially in media specimens.
Conclusion:
Using a sensitive and specific nested PCR, we were not able to detect C. pneumoniae in symptomatic AAA. The failure to detect C. pneumoniae in symptomatic AAA, combined with previously reported positive findings in atherosclerotic lesions, supports the hypothesis that AAA and atherosclerosis might be two different disease entities.
Insights
Chlamydia pneumoniae was not detected in symptomatic abdominal aortic aneurysms (AAA) using sensitive PCR. This finding suggests AAA and atherosclerosis may be distinct conditions, despite prior evidence linking Chlamydia pneumoniae to atherosclerosis.
Area of Science:
- Vascular Biology
- Infectious Diseases
- Genetics
Background:
- Chlamydia pneumoniae has been implicated in atherosclerosis.
- The role of Chlamydia pneumoniae in abdominal aortic aneurysms (AAA) remains unclear.
- Symptomatic AAA presents a critical clinical challenge.
Purpose of the Study:
- To determine the presence of Chlamydia pneumoniae in symptomatic abdominal aortic aneurysms (AAA).
- To investigate potential differences between AAA and atherosclerosis pathogenesis.
Main Methods:
- Optimized DNA extraction from 124 AAA wall specimens.
- Conducted an inhibitor-controlled nested polymerase chain reaction (PCR).
- Targeted the gene for the C. pneumoniae major outer membrane protein.
Main Results:
- Chlamydia pneumoniae-specific DNA was not found in any AAA specimens.
- Minor PCR inhibition was observed, particularly in media specimens.
- Sensitive nested PCR failed to detect the pathogen.
Conclusions:
- Chlamydia pneumoniae is not detectable in symptomatic AAA using sensitive PCR.
- Findings support the hypothesis that AAA and atherosclerosis are distinct disease entities.
- Further research is needed to elucidate the specific mechanisms of AAA development.