No evidence of involvement of Chlamydia pneumoniae in severe cerebrovascular atherosclerosis by means of quantitative real-time polymerase chain reaction
Autor: | Manfred Rotter, Marion Nehr, Birgit Willinger, Alexander M. Hirschl, Petra Apfalter, Wolfgang Barousch |
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Rok vydání: | 2004 |
Předmět: |
Carotid Artery Diseases
DNA Bacterial Male Pathology medicine.medical_specialty medicine.medical_treatment Carotid endarterectomy Endarterectomy medicine.disease_cause Peripheral blood mononuclear cell Polymerase Chain Reaction law.invention law Computer Systems medicine TaqMan Prevalence Humans Chlamydiaceae Stroke Chlamydophila Infections Polymerase chain reaction Aged Advanced and Specialized Nursing biology business.industry Chlamydophila pneumoniae Middle Aged medicine.disease biology.organism_classification Intracranial Arteriosclerosis Antibodies Bacterial Immunology Leukocytes Mononuclear Female Neurology (clinical) Cardiology and Cardiovascular Medicine business Bacterial Outer Membrane Proteins |
Zdroj: | Stroke. 35(9) |
ISSN: | 1524-4628 |
Popis: | Background and Purpose— All studies reporting high numbers of Chlamydia pneumoniae DNA positives in stroke patients published to date have used polymerase chain reaction (PCR) techniques highly prone to generate false-positive results. The aim of this study was to analyze the prevalence of C. pneumoniae DNA in plaques of the carotid artery as well as in peripheral blood by means of a new, closed, real-time PCR system. Methods— Carotid endarterectomy specimens and preoperative peripheral blood mononuclear cells (PBMC) of 75 individuals with severe cerebrovascular atherosclerosis were analyzed by means of a C. pneumoniae -specific quantitative omp A-based real-time PCR TaqMan system. Plaques were also cultured onto HEp-2 cells. Before the surgical intervention, C. pneumoniae -specific IgM, IgG, and IgA as well as C-reactive protein (CRP) levels were determined. Results— 89% of all patients studied had C. pneumoniae- specific antibodies, but the pathogen was not detected in a single carotid atheroma by real-time PCR and cell culture. However, C. pneumoniae DNA was detected in 4 PBMC samples (5.3%) at very low levels (C. pneumoniae PCR, results and CRP values after correction for multiplicity-of-test adjustment. Conclusions— By means of a closed, highly sensitive, and specific real-time PCR, C. pneumoniae was not detected in cerebrovascular atherosclerosis. PCR on PBMC was not predictive for endovascular chlamydia infection and most likely stem from previous C. pneumoniae respiratory tract infection in individual cases. |
Databáze: | OpenAIRE |
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