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Serological association between Chlamydia pneumoniae infection and age-related macular degeneration
Murat V Kalayoglu1, Carlos Galvan, Olaimatu S Mahdi
1Department of Ophthalmology, Massachusetts Eye and Ear Infirmary, Ophthalmic Education Center, Boston 02114, USA. Murat_Kalayoglu@meei.harvard.edu
Background:
Age-related macular degeneration (ARMD) is a leading cause of blindness in the United States, but the mechanisms that initiate and promote the disease remain ill defined. There are several risk factors that ARMD shares with atherosclerosis, and these diseases may have similar pathogenic mechanisms that involve inflammation. Chlamydia pneumoniae, a prokaryotic pathogen that causes chronic inflammation is now emerging as a risk factor in the development of cardiovascular diseases. It is therefore plausible that this microorganism also contributes to the pathogenesis of ARMD.
Methods:
To examine if C pneumoniae infection is associated with ARMD, serum samples from 25 consecutive patients with ARMD and from 18 without the disease were collected and assayed for the presence of the antibodies to C pneumoniae elementary bodies, Chlamydia trachomatis heat shock protein 60 (cHsp60), C trachomatis heat shock protein 10 (cHsp10), Escherichia coli GroEL, and E coli GroES.
Results:
A serological association was found between ARMD and anti-C pneumoniae antibodies (P =.047) but not between ARMD and the anti-C trachomatis or anti-E coli heat shock protein antibodies. The association remained statistically significant after adjusting for age and smoking, both established risk factors for ARMD.
Conclusions:
These data indicate that C pneumoniae infection may be associated with ARMD. Further studies on larger cohorts of individuals are necessary to determine if this pathogen plays a role in the pathogenesis of ARMD.
Insights
Chlamydia pneumoniae infection may be linked to age-related macular degeneration (ARMD). This study found antibodies to C. pneumoniae in ARMD patients, suggesting a potential role for this pathogen in the disease. Further research is needed.
Area of Science:
- Ophthalmology
- Infectious Disease
- Pathogenesis
Background:
- Age-related macular degeneration (ARMD) is a primary cause of vision loss in the US.
- The exact mechanisms driving ARMD progression are not fully understood.
- ARMD shares risk factors with atherosclerosis, suggesting inflammation may play a role.
Purpose of the Study:
- To investigate the potential association between Chlamydia pneumoniae infection and ARMD.
- To explore if C. pneumoniae contributes to the pathogenesis of ARMD.
Main Methods:
- Serum samples were collected from 25 ARMD patients and 18 controls.
- Antibodies against C. pneumoniae, C. trachomatis, and E. coli heat shock proteins were measured.
Main Results:
- A statistically significant association was observed between ARMD and antibodies to C. pneumoniae (P =.047).
- No significant association was found with antibodies to C. trachomatis or E. coli heat shock proteins.
- The association remained significant after adjusting for age and smoking.
Conclusions:
- The findings suggest a potential link between C. pneumoniae infection and ARMD.
- Further large-scale studies are required to confirm the role of C. pneumoniae in ARMD pathogenesis.
