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Forward Genetic Approaches in Chlamydia trachomatis
Published on: October 23, 2013
Chlamydial infection of immune cells: altered function and implications for disease
Kenneth W Beagley1, Wilhelmina M Huston, Philip M Hansbro
1Institute of Health and Biomedical Innovation, Queensland University of Technology, Australia. k2.beagley@qut.edu.au
Abstract:
Chlamydia trachomatis is an obligate intracellular bacterial pathogen that infects the genital and ocular mucosa of humans, causing infections that can lead to pelvic inflammatory disease, infertility, and blinding trachoma. C. pneumoniae is a respiratory pathogen that is the cause of 12-15% of community-acquired pneumonia. Both chlamydial species were believed to be restricted to the epithelia of the genital, ocular, and respiratory mucosa; however, increasing evidence suggests that both these pathogens can be isolated from peripheral blood of both healthy individuals and patients with inflammatory conditions such as coronary artery disease and asthma. Chlamydia can also be isolated from brain tissues of patients with degenerative neurological disorders such as Alzheimer's disease and multiple sclerosis, and also from certain lymphomas. An increasing number of in vitro studies suggest that some chlamydial species can infect immune cells, at least at low levels. These infections may alter immune cell function in a way that promotes chlamydial persistence in the host and contributes to the progression of several chronic inflammatory diseases. In this paper, we review the evidence for the growth of Chlamydia in immune cells, particularly monocytes/macrophages and dendritic cells, and describe how infection may affect the function of these cells.
Insights
Chlamydia bacteria, typically infecting mucosal tissues, can also be found in blood and brain cells. This review explores how Chlamydia infection impacts immune cells, potentially driving chronic inflammatory diseases.
Area of Science:
- Immunology
- Microbiology
- Infectious Diseases
Background:
- Chlamydia trachomatis and Chlamydia pneumoniae are significant human pathogens.
- Traditionally, chlamydial infections were confined to mucosal tissues.
- Emerging evidence indicates Chlamydia's presence in blood and neurological tissues.
Purpose of the Study:
- To review evidence of Chlamydia growth within immune cells.
- To investigate the impact of Chlamydia infection on immune cell function.
- To understand Chlamydia's role in chronic inflammatory diseases.
Main Methods:
- Review of existing scientific literature.
- Analysis of in vitro studies on Chlamydia-immune cell interactions.
- Examination of clinical data linking Chlamydia to inflammatory conditions.
Main Results:
- Chlamydia species can be isolated from peripheral blood and brain tissues.
- In vitro studies suggest Chlamydia can infect immune cells like monocytes/macrophages and dendritic cells.
- Chlamydial infections may alter immune cell function, promoting persistence and disease progression.
Conclusions:
- Chlamydia's ability to infect immune cells challenges previous understanding of its pathogenesis.
- Immune cell infection by Chlamydia may contribute to chronic inflammatory diseases.
- Further research is needed to elucidate the mechanisms of Chlamydia-immune cell interactions and their clinical implications.
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