Abstract
Background
Chlamydia pneumoniae causes respiratory infection in adults and children, and has been associated with asthma exacerbations and induction of Immunoglobulin (Ig) E responses. We previously reported that C. pneumoniae enhances T helper (Th) 2 responses of peripheral blood mononuclear cells (PBMC) from asthmatic patients. It is likely that toll like receptor (TLR)-2 and TLR-4 mediate cytokine responses and host defense against C. pneumoniae. Thus, we sought to determine whether engagement of TLR-2 or TLR-4 may induce IL-12 production in our C. pneumoniae model.
Methods
PBMC (1.5 × 106) from asthmatic patients (N = 10) and non-asthmatic controls (N = 5) were infected or mock-infected for 1 h ± C. pneumoniae TW183 at a multiplicity of infection (MOI) = 1 and MOI = 0.1, and cultured for 48 h ± anti- TLR-2 and TLR-4 antibodies (Abs) (1 mg/mL). Interleukin (IL)-12 (48 h p.i.) and total IgE levels (day 10) were measured in supernatants (ELISA).
Results
High IgE levels were detected in supernatants of C. pneumoniae- infected PBMC from asthmatics on day 10, compared with mock-infected PBMC (p < 0.03). In contrast, IgE was not detected (<0.3 ng/mL) in either C. pneumoniae infected or mock-infected PBMC from non-asthmatics. IL-12 production by C. pneumoniae-infected asthmatic and non-asthmatic PBMC were similar. When anti-TLR4, but not anti-TLR2, was included in culture, IL-12 production by C. pneumoniae- infected asthmatic PBMC decreased.
Conclusions
C. pneumoniae infection induces IgE production and modulates IL-12 responses in patients with asthma, which may be caused, in part, by differences in TLR-2 and TLR-4 stimulation.
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Abbreviations
- C. pneumoniae :
-
Chlamydia pneumoniae
- Ab:
-
Antibodies
- IFN-γ:
-
Interferon γ
- IL:
-
Interleukin
- Ig:
-
Immunoglobulin
- MIF:
-
Microimmunofluorescence
- PBMC:
-
Peripheral blood mononuclear cells
- Th:
-
T helper
- TLR:
-
Toll like receptor
- TNF-α:
-
Tumor necrosis factor alpha
- ELISA:
-
Enzyme-linked immunosorbent assay
- PAMPs:
-
Pathogen-associated molecular patterns
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Acknowledgements
We would like to thank Kevin B. Norowitz, M.D., Department of Pediatrics, SUNY Downstate Medical Center for fruitful discussions.
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The authors declare no conflict of interest to disclose.
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Research involving human participants was approved by the SUNY Downstate Med Ctr IRB committee (stated in methods).
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We had informed consent from patients.
Funding
This work was supported by the Thrasher Research Fund (Young Investigator Award awarded to Stephan Kohlhoff, M.D.) and a NY State Divisional Grant (Awarded to Tamar A. Smith-Norowitz, Ph.D).
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Smith-Norowitz, T.A., Perlman, J., Norowitz, Y.M. et al. Chlamydia pneumoniae induces interleukin-12 responses in peripheral blood mononuclear cells in asthma and the role of toll like receptor 2 versus 4: a pilot study. Ir J Med Sci 186, 511–517 (2017). https://doi.org/10.1007/s11845-016-1549-9
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DOI: https://doi.org/10.1007/s11845-016-1549-9