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Detection of Chlamydia pneumoniae in cholesteatoma tissue: any pathogenetic role?
Francesco Ronchetti1, Roberto Ronchetti, Francesco Guglielmi
1Departments of Neurology and Otorhinolaryngology, University "La Sapienza" I, Rome, Italy.
Background:
Acquired cholesteatoma is a complication of chronic otitis media that is usually associated with an intense local inflammatory reaction. Cholesteatoma probably arises from epithelial migration close to an ongoing host inflammatory response attributable to a chronic bacterial infection. Chlamydia pneumoniae is an intracellular microorganism associated with several pathologic conditions originally considered noninflammatory, including asthma, atherosclerosis, and Alzheimer disease. To investigate a possible relationship between C. pneumoniae and the development of cholesteatoma, tissue was studied in three different layers by polymerase chain reaction analysis. The results were compared with those relative to other two common middle-ear pathogens, Mycoplasma pneumoniae and Haemophilus influenzae.
Methods:
Cholesteatoma specimens were collected from 32 patients undergoing middle ear surgery. A series of 5 microm-thick specimens were obtained at three different tissue levels, internal (matrix), intermediate (perimatrix), and external (granulation tissue), and processed by polymerase chain reaction for detection of C. pneumoniae, H. influenzae, and M. pneumoniae. Fragmentation and polymerase chain reaction amplification were carried out using two substantially different techniques.
Results:
C. pneumoniae was detected with either polymerase chain reaction techniques in the internal layers in 16 of the 32 cholesteatomas (50%), associated with a positive finding in the intermediate layer in two cases and in the external layer in one case. Four specimens contained H. influenzae, always in the external layer, whereas none contained M. pneumoniae.
Conclusions:
The close relationship between cholesteatoma and C. pneumoniae demonstrated by the findings of this study could suggest a direct cause and effect link between the pathogen action and the clinical manifestations. Otherwise, a facilitated colonization by C. pneumoniae and chronic pathology of the ear could both take origin from a peculiar immunologic background of the host.
Insights
Chlamydia pneumoniae was detected in 50% of acquired cholesteatoma samples, suggesting a potential link between this pathogen and chronic otitis media complications. Further research is needed to confirm a direct cause-and-effect relationship.
Area of Science:
- Otolaryngology
- Infectious Diseases
- Pathology
Background:
- Acquired cholesteatoma, a complication of chronic otitis media, involves intense inflammation likely driven by bacterial infection.
- Chlamydia pneumoniae, an intracellular pathogen, is implicated in various non-inflammatory conditions.
Purpose of the Study:
- To investigate the potential association between Chlamydia pneumoniae and the development of acquired cholesteatoma.
- To compare the prevalence of C. pneumoniae with Mycoplasma pneumoniae and Haemophilus influenzae in cholesteatoma tissues.
Main Methods:
- Cholesteatoma specimens from 32 patients were analyzed using polymerase chain reaction (PCR) at three tissue levels: internal (matrix), intermediate (perimatrix), and external (granulation tissue).
- Two distinct PCR techniques were employed to detect C. pneumoniae, H. influenzae, and M. pneumoniae.
Main Results:
- Chlamydia pneumoniae was detected in the internal layers of 16 out of 32 cholesteatomas (50%).
- H. influenzae was found in four specimens, exclusively in the external layer; M. pneumoniae was not detected.
- C. pneumoniae showed positive findings in intermediate and external layers in a few cases.
Conclusions:
- The study indicates a significant association between cholesteatoma and C. pneumoniae.
- This finding may suggest a direct causal role for C. pneumoniae in cholesteatoma development or a facilitated colonization due to host immunologic factors.