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Cytokine responses in patients with pneumonia caused by Chlamydia or Mycoplasma
P Kragsbjerg1, T Vikerfors, H Holmberg
1Department of Infectious Diseases, Orebro Medical Center Hospital, Sweden.
Abstract:
The serum concentrations of interleukin-6 (IL-6), tumor necrosis factor-alpha (TNF-alpha), and interferon-gamma (IFN-gamma) were measured by enzyme immunoassays in 44 patients with Chlamydia (n = 13) or Mycoplasma (n = 14) pneumonia or influenza A infection (n = 17) and in 20 control subjects. The levels of IFN-gamma were raised in 29/44 patients. The concentrations of IL-6 were raised in 32/44 patients. Raised levels of TNF-alpha were seen in 26/44 but there was no significant difference between the levels of the different groups of patients. All three cytokines indicated clinical recovery when acute and convalescent samples from 10 patients with Chlamydia pneumonia were analyzed. IFN-gamma, IL6 and TNF-alpha are present in the circulation in the majority of patients with Chlamydia and Mycoplasma pneumonia and in influenza A infection. We suggest that repeated measurement of cytokines, such as IL-6, IFN-gamma and TNF-alpha, may be useful in the management of lower respiratory tract infections but further studies are needed to define the value of cytokine measurements in acute pneumonia.
Insights
Elevated levels of interleukin-6 (IL-6), tumor necrosis factor-alpha (TNF-alpha), and interferon-gamma (IFN-gamma) indicate infection in patients with pneumonia or influenza. These cytokine measurements may aid in managing lower respiratory tract infections.
Area of Science:
- Immunology
- Infectious Diseases
- Respiratory Medicine
Background:
- Lower respiratory tract infections, including pneumonia and influenza, are significant global health concerns.
- Cytokines play a crucial role in the immune response to infections.
- Understanding cytokine profiles in these infections can offer insights into disease pathogenesis and management.
Purpose of the Study:
- To investigate serum concentrations of key cytokines in patients with Chlamydia pneumonia, Mycoplasma pneumonia, and influenza A infection.
- To determine if these cytokine levels correlate with the presence and severity of infection.
- To explore the potential utility of repeated cytokine measurements in monitoring clinical recovery.
Main Methods:
- Serum samples were collected from 44 patients diagnosed with Chlamydia or Mycoplasma pneumonia or influenza A infection, and 20 healthy control subjects.
- Enzyme immunoassays were employed to quantify the concentrations of interleukin-6 (IL-6), tumor necrosis factor-alpha (TNF-alpha), and interferon-gamma (IFN-gamma).
- Acute and convalescent serum samples from 10 patients with Chlamydia pneumonia were analyzed to assess cytokine changes during recovery.
Main Results:
- Elevated levels of IFN-gamma were observed in 29/44 patients, IL-6 in 32/44 patients, and TNF-alpha in 26/44 patients.
- While all three cytokines were frequently detected in patients across different infection groups, no significant differences were found between the specific patient groups.
- Analysis of Chlamydia pneumonia patients showed that all three cytokines (IFN-gamma, IL-6, TNF-alpha) reflected clinical recovery when comparing acute and convalescent samples.
Conclusions:
- Interferon-gamma, interleukin-6, and tumor necrosis factor-alpha are present in the circulation of the majority of patients with Chlamydia and Mycoplasma pneumonia and influenza A infection.
- Repeated measurement of these cytokines may hold promise for managing lower respiratory tract infections.
- Further research is necessary to establish the precise value of cytokine measurements in the context of acute pneumonia management.